diff --git a/libavcodec/arm/h264qpel_init_arm.c b/libavcodec/arm/h264qpel_init_arm.c
index a232689681..01615b5719 100644
--- a/libavcodec/arm/h264qpel_init_arm.c
+++ b/libavcodec/arm/h264qpel_init_arm.c
@@ -26,73 +26,73 @@
 #include "libavutil/arm/cpu.h"
 #include "libavcodec/h264qpel.h"
 
-void ff_put_h264_qpel16_mc00_neon(uint8_t *, uint8_t *, ptrdiff_t);
-void ff_put_h264_qpel16_mc10_neon(uint8_t *, uint8_t *, ptrdiff_t);
-void ff_put_h264_qpel16_mc20_neon(uint8_t *, uint8_t *, ptrdiff_t);
-void ff_put_h264_qpel16_mc30_neon(uint8_t *, uint8_t *, ptrdiff_t);
-void ff_put_h264_qpel16_mc01_neon(uint8_t *, uint8_t *, ptrdiff_t);
-void ff_put_h264_qpel16_mc11_neon(uint8_t *, uint8_t *, ptrdiff_t);
-void ff_put_h264_qpel16_mc21_neon(uint8_t *, uint8_t *, ptrdiff_t);
-void ff_put_h264_qpel16_mc31_neon(uint8_t *, uint8_t *, ptrdiff_t);
-void ff_put_h264_qpel16_mc02_neon(uint8_t *, uint8_t *, ptrdiff_t);
-void ff_put_h264_qpel16_mc12_neon(uint8_t *, uint8_t *, ptrdiff_t);
-void ff_put_h264_qpel16_mc22_neon(uint8_t *, uint8_t *, ptrdiff_t);
-void ff_put_h264_qpel16_mc32_neon(uint8_t *, uint8_t *, ptrdiff_t);
-void ff_put_h264_qpel16_mc03_neon(uint8_t *, uint8_t *, ptrdiff_t);
-void ff_put_h264_qpel16_mc13_neon(uint8_t *, uint8_t *, ptrdiff_t);
-void ff_put_h264_qpel16_mc23_neon(uint8_t *, uint8_t *, ptrdiff_t);
-void ff_put_h264_qpel16_mc33_neon(uint8_t *, uint8_t *, ptrdiff_t);
+void ff_put_h264_qpel16_mc00_neon(uint8_t *dst, const uint8_t *src, ptrdiff_t stride);
+void ff_put_h264_qpel16_mc10_neon(uint8_t *dst, const uint8_t *src, ptrdiff_t stride);
+void ff_put_h264_qpel16_mc20_neon(uint8_t *dst, const uint8_t *src, ptrdiff_t stride);
+void ff_put_h264_qpel16_mc30_neon(uint8_t *dst, const uint8_t *src, ptrdiff_t stride);
+void ff_put_h264_qpel16_mc01_neon(uint8_t *dst, const uint8_t *src, ptrdiff_t stride);
+void ff_put_h264_qpel16_mc11_neon(uint8_t *dst, const uint8_t *src, ptrdiff_t stride);
+void ff_put_h264_qpel16_mc21_neon(uint8_t *dst, const uint8_t *src, ptrdiff_t stride);
+void ff_put_h264_qpel16_mc31_neon(uint8_t *dst, const uint8_t *src, ptrdiff_t stride);
+void ff_put_h264_qpel16_mc02_neon(uint8_t *dst, const uint8_t *src, ptrdiff_t stride);
+void ff_put_h264_qpel16_mc12_neon(uint8_t *dst, const uint8_t *src, ptrdiff_t stride);
+void ff_put_h264_qpel16_mc22_neon(uint8_t *dst, const uint8_t *src, ptrdiff_t stride);
+void ff_put_h264_qpel16_mc32_neon(uint8_t *dst, const uint8_t *src, ptrdiff_t stride);
+void ff_put_h264_qpel16_mc03_neon(uint8_t *dst, const uint8_t *src, ptrdiff_t stride);
+void ff_put_h264_qpel16_mc13_neon(uint8_t *dst, const uint8_t *src, ptrdiff_t stride);
+void ff_put_h264_qpel16_mc23_neon(uint8_t *dst, const uint8_t *src, ptrdiff_t stride);
+void ff_put_h264_qpel16_mc33_neon(uint8_t *dst, const uint8_t *src, ptrdiff_t stride);
 
-void ff_put_h264_qpel8_mc00_neon(uint8_t *, uint8_t *, ptrdiff_t);
-void ff_put_h264_qpel8_mc10_neon(uint8_t *, uint8_t *, ptrdiff_t);
-void ff_put_h264_qpel8_mc20_neon(uint8_t *, uint8_t *, ptrdiff_t);
-void ff_put_h264_qpel8_mc30_neon(uint8_t *, uint8_t *, ptrdiff_t);
-void ff_put_h264_qpel8_mc01_neon(uint8_t *, uint8_t *, ptrdiff_t);
-void ff_put_h264_qpel8_mc11_neon(uint8_t *, uint8_t *, ptrdiff_t);
-void ff_put_h264_qpel8_mc21_neon(uint8_t *, uint8_t *, ptrdiff_t);
-void ff_put_h264_qpel8_mc31_neon(uint8_t *, uint8_t *, ptrdiff_t);
-void ff_put_h264_qpel8_mc02_neon(uint8_t *, uint8_t *, ptrdiff_t);
-void ff_put_h264_qpel8_mc12_neon(uint8_t *, uint8_t *, ptrdiff_t);
-void ff_put_h264_qpel8_mc22_neon(uint8_t *, uint8_t *, ptrdiff_t);
-void ff_put_h264_qpel8_mc32_neon(uint8_t *, uint8_t *, ptrdiff_t);
-void ff_put_h264_qpel8_mc03_neon(uint8_t *, uint8_t *, ptrdiff_t);
-void ff_put_h264_qpel8_mc13_neon(uint8_t *, uint8_t *, ptrdiff_t);
-void ff_put_h264_qpel8_mc23_neon(uint8_t *, uint8_t *, ptrdiff_t);
-void ff_put_h264_qpel8_mc33_neon(uint8_t *, uint8_t *, ptrdiff_t);
+void ff_put_h264_qpel8_mc00_neon(uint8_t *dst, const uint8_t *src, ptrdiff_t stride);
+void ff_put_h264_qpel8_mc10_neon(uint8_t *dst, const uint8_t *src, ptrdiff_t stride);
+void ff_put_h264_qpel8_mc20_neon(uint8_t *dst, const uint8_t *src, ptrdiff_t stride);
+void ff_put_h264_qpel8_mc30_neon(uint8_t *dst, const uint8_t *src, ptrdiff_t stride);
+void ff_put_h264_qpel8_mc01_neon(uint8_t *dst, const uint8_t *src, ptrdiff_t stride);
+void ff_put_h264_qpel8_mc11_neon(uint8_t *dst, const uint8_t *src, ptrdiff_t stride);
+void ff_put_h264_qpel8_mc21_neon(uint8_t *dst, const uint8_t *src, ptrdiff_t stride);
+void ff_put_h264_qpel8_mc31_neon(uint8_t *dst, const uint8_t *src, ptrdiff_t stride);
+void ff_put_h264_qpel8_mc02_neon(uint8_t *dst, const uint8_t *src, ptrdiff_t stride);
+void ff_put_h264_qpel8_mc12_neon(uint8_t *dst, const uint8_t *src, ptrdiff_t stride);
+void ff_put_h264_qpel8_mc22_neon(uint8_t *dst, const uint8_t *src, ptrdiff_t stride);
+void ff_put_h264_qpel8_mc32_neon(uint8_t *dst, const uint8_t *src, ptrdiff_t stride);
+void ff_put_h264_qpel8_mc03_neon(uint8_t *dst, const uint8_t *src, ptrdiff_t stride);
+void ff_put_h264_qpel8_mc13_neon(uint8_t *dst, const uint8_t *src, ptrdiff_t stride);
+void ff_put_h264_qpel8_mc23_neon(uint8_t *dst, const uint8_t *src, ptrdiff_t stride);
+void ff_put_h264_qpel8_mc33_neon(uint8_t *dst, const uint8_t *src, ptrdiff_t stride);
 
-void ff_avg_h264_qpel16_mc00_neon(uint8_t *, uint8_t *, ptrdiff_t);
-void ff_avg_h264_qpel16_mc10_neon(uint8_t *, uint8_t *, ptrdiff_t);
-void ff_avg_h264_qpel16_mc20_neon(uint8_t *, uint8_t *, ptrdiff_t);
-void ff_avg_h264_qpel16_mc30_neon(uint8_t *, uint8_t *, ptrdiff_t);
-void ff_avg_h264_qpel16_mc01_neon(uint8_t *, uint8_t *, ptrdiff_t);
-void ff_avg_h264_qpel16_mc11_neon(uint8_t *, uint8_t *, ptrdiff_t);
-void ff_avg_h264_qpel16_mc21_neon(uint8_t *, uint8_t *, ptrdiff_t);
-void ff_avg_h264_qpel16_mc31_neon(uint8_t *, uint8_t *, ptrdiff_t);
-void ff_avg_h264_qpel16_mc02_neon(uint8_t *, uint8_t *, ptrdiff_t);
-void ff_avg_h264_qpel16_mc12_neon(uint8_t *, uint8_t *, ptrdiff_t);
-void ff_avg_h264_qpel16_mc22_neon(uint8_t *, uint8_t *, ptrdiff_t);
-void ff_avg_h264_qpel16_mc32_neon(uint8_t *, uint8_t *, ptrdiff_t);
-void ff_avg_h264_qpel16_mc03_neon(uint8_t *, uint8_t *, ptrdiff_t);
-void ff_avg_h264_qpel16_mc13_neon(uint8_t *, uint8_t *, ptrdiff_t);
-void ff_avg_h264_qpel16_mc23_neon(uint8_t *, uint8_t *, ptrdiff_t);
-void ff_avg_h264_qpel16_mc33_neon(uint8_t *, uint8_t *, ptrdiff_t);
+void ff_avg_h264_qpel16_mc00_neon(uint8_t *dst, const uint8_t *src, ptrdiff_t stride);
+void ff_avg_h264_qpel16_mc10_neon(uint8_t *dst, const uint8_t *src, ptrdiff_t stride);
+void ff_avg_h264_qpel16_mc20_neon(uint8_t *dst, const uint8_t *src, ptrdiff_t stride);
+void ff_avg_h264_qpel16_mc30_neon(uint8_t *dst, const uint8_t *src, ptrdiff_t stride);
+void ff_avg_h264_qpel16_mc01_neon(uint8_t *dst, const uint8_t *src, ptrdiff_t stride);
+void ff_avg_h264_qpel16_mc11_neon(uint8_t *dst, const uint8_t *src, ptrdiff_t stride);
+void ff_avg_h264_qpel16_mc21_neon(uint8_t *dst, const uint8_t *src, ptrdiff_t stride);
+void ff_avg_h264_qpel16_mc31_neon(uint8_t *dst, const uint8_t *src, ptrdiff_t stride);
+void ff_avg_h264_qpel16_mc02_neon(uint8_t *dst, const uint8_t *src, ptrdiff_t stride);
+void ff_avg_h264_qpel16_mc12_neon(uint8_t *dst, const uint8_t *src, ptrdiff_t stride);
+void ff_avg_h264_qpel16_mc22_neon(uint8_t *dst, const uint8_t *src, ptrdiff_t stride);
+void ff_avg_h264_qpel16_mc32_neon(uint8_t *dst, const uint8_t *src, ptrdiff_t stride);
+void ff_avg_h264_qpel16_mc03_neon(uint8_t *dst, const uint8_t *src, ptrdiff_t stride);
+void ff_avg_h264_qpel16_mc13_neon(uint8_t *dst, const uint8_t *src, ptrdiff_t stride);
+void ff_avg_h264_qpel16_mc23_neon(uint8_t *dst, const uint8_t *src, ptrdiff_t stride);
+void ff_avg_h264_qpel16_mc33_neon(uint8_t *dst, const uint8_t *src, ptrdiff_t stride);
 
-void ff_avg_h264_qpel8_mc00_neon(uint8_t *, uint8_t *, ptrdiff_t);
-void ff_avg_h264_qpel8_mc10_neon(uint8_t *, uint8_t *, ptrdiff_t);
-void ff_avg_h264_qpel8_mc20_neon(uint8_t *, uint8_t *, ptrdiff_t);
-void ff_avg_h264_qpel8_mc30_neon(uint8_t *, uint8_t *, ptrdiff_t);
-void ff_avg_h264_qpel8_mc01_neon(uint8_t *, uint8_t *, ptrdiff_t);
-void ff_avg_h264_qpel8_mc11_neon(uint8_t *, uint8_t *, ptrdiff_t);
-void ff_avg_h264_qpel8_mc21_neon(uint8_t *, uint8_t *, ptrdiff_t);
-void ff_avg_h264_qpel8_mc31_neon(uint8_t *, uint8_t *, ptrdiff_t);
-void ff_avg_h264_qpel8_mc02_neon(uint8_t *, uint8_t *, ptrdiff_t);
-void ff_avg_h264_qpel8_mc12_neon(uint8_t *, uint8_t *, ptrdiff_t);
-void ff_avg_h264_qpel8_mc22_neon(uint8_t *, uint8_t *, ptrdiff_t);
-void ff_avg_h264_qpel8_mc32_neon(uint8_t *, uint8_t *, ptrdiff_t);
-void ff_avg_h264_qpel8_mc03_neon(uint8_t *, uint8_t *, ptrdiff_t);
-void ff_avg_h264_qpel8_mc13_neon(uint8_t *, uint8_t *, ptrdiff_t);
-void ff_avg_h264_qpel8_mc23_neon(uint8_t *, uint8_t *, ptrdiff_t);
-void ff_avg_h264_qpel8_mc33_neon(uint8_t *, uint8_t *, ptrdiff_t);
+void ff_avg_h264_qpel8_mc00_neon(uint8_t *dst, const uint8_t *src, ptrdiff_t stride);
+void ff_avg_h264_qpel8_mc10_neon(uint8_t *dst, const uint8_t *src, ptrdiff_t stride);
+void ff_avg_h264_qpel8_mc20_neon(uint8_t *dst, const uint8_t *src, ptrdiff_t stride);
+void ff_avg_h264_qpel8_mc30_neon(uint8_t *dst, const uint8_t *src, ptrdiff_t stride);
+void ff_avg_h264_qpel8_mc01_neon(uint8_t *dst, const uint8_t *src, ptrdiff_t stride);
+void ff_avg_h264_qpel8_mc11_neon(uint8_t *dst, const uint8_t *src, ptrdiff_t stride);
+void ff_avg_h264_qpel8_mc21_neon(uint8_t *dst, const uint8_t *src, ptrdiff_t stride);
+void ff_avg_h264_qpel8_mc31_neon(uint8_t *dst, const uint8_t *src, ptrdiff_t stride);
+void ff_avg_h264_qpel8_mc02_neon(uint8_t *dst, const uint8_t *src, ptrdiff_t stride);
+void ff_avg_h264_qpel8_mc12_neon(uint8_t *dst, const uint8_t *src, ptrdiff_t stride);
+void ff_avg_h264_qpel8_mc22_neon(uint8_t *dst, const uint8_t *src, ptrdiff_t stride);
+void ff_avg_h264_qpel8_mc32_neon(uint8_t *dst, const uint8_t *src, ptrdiff_t stride);
+void ff_avg_h264_qpel8_mc03_neon(uint8_t *dst, const uint8_t *src, ptrdiff_t stride);
+void ff_avg_h264_qpel8_mc13_neon(uint8_t *dst, const uint8_t *src, ptrdiff_t stride);
+void ff_avg_h264_qpel8_mc23_neon(uint8_t *dst, const uint8_t *src, ptrdiff_t stride);
+void ff_avg_h264_qpel8_mc33_neon(uint8_t *dst, const uint8_t *src, ptrdiff_t stride);
 
 av_cold void ff_h264qpel_init_arm(H264QpelContext *c, int bit_depth)
 {
diff --git a/libavcodec/arm/rv40dsp_init_arm.c b/libavcodec/arm/rv40dsp_init_arm.c
index 6ad60fadce..df3e4611a1 100644
--- a/libavcodec/arm/rv40dsp_init_arm.c
+++ b/libavcodec/arm/rv40dsp_init_arm.c
@@ -26,8 +26,10 @@
 #include "libavutil/arm/cpu.h"
 
 #define DECL_QPEL3(type, w, pos) \
-    void ff_##type##_rv40_qpel##w##_mc##pos##_neon(uint8_t *dst, uint8_t *src,\
-                                                   ptrdiff_t stride)
+void ff_ ## type ## _rv40_qpel ## w ## _mc ## pos ## _neon(uint8_t *dst,       \
+                                                           const uint8_t *src, \
+                                                           ptrdiff_t stride)
+
 #define DECL_QPEL2(w, pos)                      \
     DECL_QPEL3(put, w, pos);                    \
     DECL_QPEL3(avg, w, pos)
diff --git a/libavcodec/cavsdsp.c b/libavcodec/cavsdsp.c
index b0f94de65b..cc7898968f 100644
--- a/libavcodec/cavsdsp.c
+++ b/libavcodec/cavsdsp.c
@@ -261,7 +261,7 @@ static void cavs_idct8_add_c(uint8_t *dst, int16_t *block, int stride) {
  ****************************************************************************/
 
 #define CAVS_SUBPIX(OPNAME, OP, NAME, A, B, C, D, E, F) \
-static void OPNAME ## cavs_filt8_h_ ## NAME(uint8_t *dst, uint8_t *src, int dstStride, int srcStride){\
+static void OPNAME ## cavs_filt8_h_ ## NAME(uint8_t *dst, const uint8_t *src, int dstStride, int srcStride){\
     const int h=8;\
     const uint8_t *cm = ff_crop_tab + MAX_NEG_CROP;\
     int i;\
@@ -280,7 +280,7 @@ static void OPNAME ## cavs_filt8_h_ ## NAME(uint8_t *dst, uint8_t *src, int dstS
     }\
 }\
 \
-static void OPNAME ## cavs_filt8_v_  ## NAME(uint8_t *dst, uint8_t *src, int dstStride, int srcStride){\
+static void OPNAME ## cavs_filt8_v_  ## NAME(uint8_t *dst, const uint8_t *src, int dstStride, int srcStride){\
     const int w=8;\
     const uint8_t *cm = ff_crop_tab + MAX_NEG_CROP;\
     int i;\
@@ -312,7 +312,7 @@ static void OPNAME ## cavs_filt8_v_  ## NAME(uint8_t *dst, uint8_t *src, int dst
     }\
 }\
 \
-static void OPNAME ## cavs_filt16_v_ ## NAME(uint8_t *dst, uint8_t *src, int dstStride, int srcStride){\
+static void OPNAME ## cavs_filt16_v_ ## NAME(uint8_t *dst, const uint8_t *src, int dstStride, int srcStride){\
     OPNAME ## cavs_filt8_v_ ## NAME(dst  , src  , dstStride, srcStride);\
     OPNAME ## cavs_filt8_v_ ## NAME(dst+8, src+8, dstStride, srcStride);\
     src += 8*srcStride;\
@@ -321,7 +321,7 @@ static void OPNAME ## cavs_filt16_v_ ## NAME(uint8_t *dst, uint8_t *src, int dst
     OPNAME ## cavs_filt8_v_ ## NAME(dst+8, src+8, dstStride, srcStride);\
 }\
 \
-static void OPNAME ## cavs_filt16_h_ ## NAME(uint8_t *dst, uint8_t *src, int dstStride, int srcStride){\
+static void OPNAME ## cavs_filt16_h_ ## NAME(uint8_t *dst, const uint8_t *src, int dstStride, int srcStride){\
     OPNAME ## cavs_filt8_h_ ## NAME(dst  , src  , dstStride, srcStride);\
     OPNAME ## cavs_filt8_h_ ## NAME(dst+8, src+8, dstStride, srcStride);\
     src += 8*srcStride;\
@@ -331,7 +331,7 @@ static void OPNAME ## cavs_filt16_h_ ## NAME(uint8_t *dst, uint8_t *src, int dst
 }\
 
 #define CAVS_SUBPIX_HV(OPNAME, OP, NAME, AH, BH, CH, DH, EH, FH, AV, BV, CV, DV, EV, FV, FULL) \
-static void OPNAME ## cavs_filt8_hv_ ## NAME(uint8_t *dst, uint8_t *src1, uint8_t *src2, int dstStride, int srcStride){\
+static void OPNAME ## cavs_filt8_hv_ ## NAME(uint8_t *dst, const uint8_t *src1, const uint8_t *src2, int dstStride, int srcStride){\
     int16_t temp[8*(8+5)];\
     int16_t *tmp = temp;\
     const int h=8;\
@@ -412,7 +412,7 @@ static void OPNAME ## cavs_filt8_hv_ ## NAME(uint8_t *dst, uint8_t *src1, uint8_
     }\
 }\
 \
-static void OPNAME ## cavs_filt16_hv_ ## NAME(uint8_t *dst, uint8_t *src1, uint8_t *src2, int dstStride, int srcStride){ \
+static void OPNAME ## cavs_filt16_hv_ ## NAME(uint8_t *dst, const uint8_t *src1, const uint8_t *src2, int dstStride, int srcStride){ \
     OPNAME ## cavs_filt8_hv_ ## NAME(dst  , src1,   src2  , dstStride, srcStride); \
     OPNAME ## cavs_filt8_hv_ ## NAME(dst+8, src1+8, src2+8, dstStride, srcStride); \
     src1 += 8*srcStride;\
@@ -423,77 +423,77 @@ static void OPNAME ## cavs_filt16_hv_ ## NAME(uint8_t *dst, uint8_t *src1, uint8
 }\
 
 #define CAVS_MC(OPNAME, SIZE) \
-static void OPNAME ## cavs_qpel ## SIZE ## _mc10_c(uint8_t *dst, uint8_t *src, ptrdiff_t stride)\
+static void OPNAME ## cavs_qpel ## SIZE ## _mc10_c(uint8_t *dst, const uint8_t *src, ptrdiff_t stride)\
 {\
     OPNAME ## cavs_filt ## SIZE ## _h_qpel_l(dst, src, stride, stride);\
 }\
 \
-static void OPNAME ## cavs_qpel ## SIZE ## _mc20_c(uint8_t *dst, uint8_t *src, ptrdiff_t stride)\
+static void OPNAME ## cavs_qpel ## SIZE ## _mc20_c(uint8_t *dst, const uint8_t *src, ptrdiff_t stride)\
 {\
     OPNAME ## cavs_filt ## SIZE ## _h_hpel(dst, src, stride, stride);\
 }\
 \
-static void OPNAME ## cavs_qpel ## SIZE ## _mc30_c(uint8_t *dst, uint8_t *src, ptrdiff_t stride)\
+static void OPNAME ## cavs_qpel ## SIZE ## _mc30_c(uint8_t *dst, const uint8_t *src, ptrdiff_t stride)\
 {\
     OPNAME ## cavs_filt ## SIZE ## _h_qpel_r(dst, src, stride, stride);\
 }\
 \
-static void OPNAME ## cavs_qpel ## SIZE ## _mc01_c(uint8_t *dst, uint8_t *src, ptrdiff_t stride)\
+static void OPNAME ## cavs_qpel ## SIZE ## _mc01_c(uint8_t *dst, const uint8_t *src, ptrdiff_t stride)\
 {\
     OPNAME ## cavs_filt ## SIZE ## _v_qpel_l(dst, src, stride, stride);\
 }\
 \
-static void OPNAME ## cavs_qpel ## SIZE ## _mc02_c(uint8_t *dst, uint8_t *src, ptrdiff_t stride)\
+static void OPNAME ## cavs_qpel ## SIZE ## _mc02_c(uint8_t *dst, const uint8_t *src, ptrdiff_t stride)\
 {\
     OPNAME ## cavs_filt ## SIZE ## _v_hpel(dst, src, stride, stride);\
 }\
 \
-static void OPNAME ## cavs_qpel ## SIZE ## _mc03_c(uint8_t *dst, uint8_t *src, ptrdiff_t stride)\
+static void OPNAME ## cavs_qpel ## SIZE ## _mc03_c(uint8_t *dst, const uint8_t *src, ptrdiff_t stride)\
 {\
     OPNAME ## cavs_filt ## SIZE ## _v_qpel_r(dst, src, stride, stride);\
 }\
 \
-static void OPNAME ## cavs_qpel ## SIZE ## _mc22_c(uint8_t *dst, uint8_t *src, ptrdiff_t stride)\
+static void OPNAME ## cavs_qpel ## SIZE ## _mc22_c(uint8_t *dst, const uint8_t *src, ptrdiff_t stride)\
 {\
   OPNAME ## cavs_filt ## SIZE ## _hv_jj(dst, src, NULL, stride, stride); \
 }\
 \
-static void OPNAME ## cavs_qpel ## SIZE ## _mc11_c(uint8_t *dst, uint8_t *src, ptrdiff_t stride)\
+static void OPNAME ## cavs_qpel ## SIZE ## _mc11_c(uint8_t *dst, const uint8_t *src, ptrdiff_t stride)\
 {\
   OPNAME ## cavs_filt ## SIZE ## _hv_egpr(dst, src, src, stride, stride); \
 }\
 \
-static void OPNAME ## cavs_qpel ## SIZE ## _mc13_c(uint8_t *dst, uint8_t *src, ptrdiff_t stride)\
+static void OPNAME ## cavs_qpel ## SIZE ## _mc13_c(uint8_t *dst, const uint8_t *src, ptrdiff_t stride)\
 {\
   OPNAME ## cavs_filt ## SIZE ## _hv_egpr(dst, src, src+stride, stride, stride); \
 }\
 \
-static void OPNAME ## cavs_qpel ## SIZE ## _mc31_c(uint8_t *dst, uint8_t *src, ptrdiff_t stride)\
+static void OPNAME ## cavs_qpel ## SIZE ## _mc31_c(uint8_t *dst, const uint8_t *src, ptrdiff_t stride)\
 {\
   OPNAME ## cavs_filt ## SIZE ## _hv_egpr(dst, src, src+1, stride, stride); \
 }\
 \
-static void OPNAME ## cavs_qpel ## SIZE ## _mc33_c(uint8_t *dst, uint8_t *src, ptrdiff_t stride)\
+static void OPNAME ## cavs_qpel ## SIZE ## _mc33_c(uint8_t *dst, const uint8_t *src, ptrdiff_t stride)\
 {\
   OPNAME ## cavs_filt ## SIZE ## _hv_egpr(dst, src, src+stride+1,stride, stride); \
 }\
 \
-static void OPNAME ## cavs_qpel ## SIZE ## _mc21_c(uint8_t *dst, uint8_t *src, ptrdiff_t stride)\
+static void OPNAME ## cavs_qpel ## SIZE ## _mc21_c(uint8_t *dst, const uint8_t *src, ptrdiff_t stride)\
 {\
   OPNAME ## cavs_filt ## SIZE ## _hv_ff(dst, src, src+stride+1,stride, stride); \
 }\
 \
-static void OPNAME ## cavs_qpel ## SIZE ## _mc12_c(uint8_t *dst, uint8_t *src, ptrdiff_t stride)\
+static void OPNAME ## cavs_qpel ## SIZE ## _mc12_c(uint8_t *dst, const uint8_t *src, ptrdiff_t stride)\
 {\
   OPNAME ## cavs_filt ## SIZE ## _hv_ii(dst, src, src+stride+1,stride, stride); \
 }\
 \
-static void OPNAME ## cavs_qpel ## SIZE ## _mc32_c(uint8_t *dst, uint8_t *src, ptrdiff_t stride)\
+static void OPNAME ## cavs_qpel ## SIZE ## _mc32_c(uint8_t *dst, const uint8_t *src, ptrdiff_t stride)\
 {\
   OPNAME ## cavs_filt ## SIZE ## _hv_kk(dst, src, src+stride+1,stride, stride); \
 }\
 \
-static void OPNAME ## cavs_qpel ## SIZE ## _mc23_c(uint8_t *dst, uint8_t *src, ptrdiff_t stride)\
+static void OPNAME ## cavs_qpel ## SIZE ## _mc23_c(uint8_t *dst, const uint8_t *src, ptrdiff_t stride)\
 {\
   OPNAME ## cavs_filt ## SIZE ## _hv_qq(dst, src, src+stride+1,stride, stride); \
 }\
diff --git a/libavcodec/h264qpel_template.c b/libavcodec/h264qpel_template.c
index 963f7f1ae2..7dd901ce24 100644
--- a/libavcodec/h264qpel_template.c
+++ b/libavcodec/h264qpel_template.c
@@ -75,12 +75,12 @@ static inline void FUNC(copy_block16)(uint8_t *dst, const uint8_t *src, int dstS
 }
 
 #define H264_LOWPASS(OPNAME, OP, OP2) \
-static av_unused void FUNC(OPNAME ## h264_qpel2_h_lowpass)(uint8_t *_dst, uint8_t *_src, int dstStride, int srcStride){\
+static av_unused void FUNC(OPNAME ## h264_qpel2_h_lowpass)(uint8_t *_dst, const uint8_t *_src, int dstStride, int srcStride){\
     const int h=2;\
     INIT_CLIP\
     int i;\
     pixel *dst = (pixel*)_dst;\
-    pixel *src = (pixel*)_src;\
+    const pixel *src = (const pixel*)_src;\
     dstStride /= sizeof(pixel);\
     srcStride /= sizeof(pixel);\
     for(i=0; i<h; i++)\
@@ -92,12 +92,12 @@ static av_unused void FUNC(OPNAME ## h264_qpel2_h_lowpass)(uint8_t *_dst, uint8_
     }\
 }\
 \
-static av_unused void FUNC(OPNAME ## h264_qpel2_v_lowpass)(uint8_t *_dst, uint8_t *_src, int dstStride, int srcStride){\
+static av_unused void FUNC(OPNAME ## h264_qpel2_v_lowpass)(uint8_t *_dst, const uint8_t *_src, int dstStride, int srcStride){\
     const int w=2;\
     INIT_CLIP\
     int i;\
     pixel *dst = (pixel*)_dst;\
-    pixel *src = (pixel*)_src;\
+    const pixel *src = (const pixel*)_src;\
     dstStride /= sizeof(pixel);\
     srcStride /= sizeof(pixel);\
     for(i=0; i<w; i++)\
@@ -116,14 +116,14 @@ static av_unused void FUNC(OPNAME ## h264_qpel2_v_lowpass)(uint8_t *_dst, uint8_
     }\
 }\
 \
-static av_unused void FUNC(OPNAME ## h264_qpel2_hv_lowpass)(uint8_t *_dst, int16_t *tmp, uint8_t *_src, int dstStride, int tmpStride, int srcStride){\
+static av_unused void FUNC(OPNAME ## h264_qpel2_hv_lowpass)(uint8_t *_dst, int16_t *tmp, const uint8_t *_src, int dstStride, int tmpStride, int srcStride){\
     const int h=2;\
     const int w=2;\
     const int pad = (BIT_DEPTH > 9) ? (-10 * ((1<<BIT_DEPTH)-1)) : 0;\
     INIT_CLIP\
     int i;\
     pixel *dst = (pixel*)_dst;\
-    pixel *src = (pixel*)_src;\
+    const pixel *src = (const pixel*)_src;\
     dstStride /= sizeof(pixel);\
     srcStride /= sizeof(pixel);\
     src -= 2*srcStride;\
@@ -150,12 +150,12 @@ static av_unused void FUNC(OPNAME ## h264_qpel2_hv_lowpass)(uint8_t *_dst, int16
         tmp++;\
     }\
 }\
-static void FUNC(OPNAME ## h264_qpel4_h_lowpass)(uint8_t *_dst, uint8_t *_src, int dstStride, int srcStride){\
+static void FUNC(OPNAME ## h264_qpel4_h_lowpass)(uint8_t *_dst, const uint8_t *_src, int dstStride, int srcStride){\
     const int h=4;\
     INIT_CLIP\
     int i;\
     pixel *dst = (pixel*)_dst;\
-    pixel *src = (pixel*)_src;\
+    const pixel *src = (const pixel*)_src;\
     dstStride /= sizeof(pixel);\
     srcStride /= sizeof(pixel);\
     for(i=0; i<h; i++)\
@@ -169,12 +169,12 @@ static void FUNC(OPNAME ## h264_qpel4_h_lowpass)(uint8_t *_dst, uint8_t *_src, i
     }\
 }\
 \
-static void FUNC(OPNAME ## h264_qpel4_v_lowpass)(uint8_t *_dst, uint8_t *_src, int dstStride, int srcStride){\
+static void FUNC(OPNAME ## h264_qpel4_v_lowpass)(uint8_t *_dst, const uint8_t *_src, int dstStride, int srcStride){\
     const int w=4;\
     INIT_CLIP\
     int i;\
     pixel *dst = (pixel*)_dst;\
-    pixel *src = (pixel*)_src;\
+    const pixel *src = (const pixel*)_src;\
     dstStride /= sizeof(pixel);\
     srcStride /= sizeof(pixel);\
     for(i=0; i<w; i++)\
@@ -197,14 +197,14 @@ static void FUNC(OPNAME ## h264_qpel4_v_lowpass)(uint8_t *_dst, uint8_t *_src, i
     }\
 }\
 \
-static void FUNC(OPNAME ## h264_qpel4_hv_lowpass)(uint8_t *_dst, int16_t *tmp, uint8_t *_src, int dstStride, int tmpStride, int srcStride){\
+static void FUNC(OPNAME ## h264_qpel4_hv_lowpass)(uint8_t *_dst, int16_t *tmp, const uint8_t *_src, int dstStride, int tmpStride, int srcStride){\
     const int h=4;\
     const int w=4;\
     const int pad = (BIT_DEPTH > 9) ? (-10 * ((1<<BIT_DEPTH)-1)) : 0;\
     INIT_CLIP\
     int i;\
     pixel *dst = (pixel*)_dst;\
-    pixel *src = (pixel*)_src;\
+    const pixel *src = (const pixel*)_src;\
     dstStride /= sizeof(pixel);\
     srcStride /= sizeof(pixel);\
     src -= 2*srcStride;\
@@ -238,12 +238,12 @@ static void FUNC(OPNAME ## h264_qpel4_hv_lowpass)(uint8_t *_dst, int16_t *tmp, u
     }\
 }\
 \
-static void FUNC(OPNAME ## h264_qpel8_h_lowpass)(uint8_t *_dst, uint8_t *_src, int dstStride, int srcStride){\
+static void FUNC(OPNAME ## h264_qpel8_h_lowpass)(uint8_t *_dst, const uint8_t *_src, int dstStride, int srcStride){\
     const int h=8;\
     INIT_CLIP\
     int i;\
     pixel *dst = (pixel*)_dst;\
-    pixel *src = (pixel*)_src;\
+    const pixel *src = (const pixel*)_src;\
     dstStride /= sizeof(pixel);\
     srcStride /= sizeof(pixel);\
     for(i=0; i<h; i++)\
@@ -261,12 +261,12 @@ static void FUNC(OPNAME ## h264_qpel8_h_lowpass)(uint8_t *_dst, uint8_t *_src, i
     }\
 }\
 \
-static void FUNC(OPNAME ## h264_qpel8_v_lowpass)(uint8_t *_dst, uint8_t *_src, int dstStride, int srcStride){\
+static void FUNC(OPNAME ## h264_qpel8_v_lowpass)(uint8_t *_dst, const uint8_t *_src, int dstStride, int srcStride){\
     const int w=8;\
     INIT_CLIP\
     int i;\
     pixel *dst = (pixel*)_dst;\
-    pixel *src = (pixel*)_src;\
+    const pixel *src = (const pixel*)_src;\
     dstStride /= sizeof(pixel);\
     srcStride /= sizeof(pixel);\
     for(i=0; i<w; i++)\
@@ -297,14 +297,14 @@ static void FUNC(OPNAME ## h264_qpel8_v_lowpass)(uint8_t *_dst, uint8_t *_src, i
     }\
 }\
 \
-static void FUNC(OPNAME ## h264_qpel8_hv_lowpass)(uint8_t *_dst, int16_t *tmp, uint8_t *_src, int dstStride, int tmpStride, int srcStride){\
+static void FUNC(OPNAME ## h264_qpel8_hv_lowpass)(uint8_t *_dst, int16_t *tmp, const uint8_t *_src, int dstStride, int tmpStride, int srcStride){\
     const int h=8;\
     const int w=8;\
     const int pad = (BIT_DEPTH > 9) ? (-10 * ((1<<BIT_DEPTH)-1)) : 0;\
     INIT_CLIP\
     int i;\
     pixel *dst = (pixel*)_dst;\
-    pixel *src = (pixel*)_src;\
+    const pixel *src = (const pixel*)_src;\
     dstStride /= sizeof(pixel);\
     srcStride /= sizeof(pixel);\
     src -= 2*srcStride;\
@@ -350,7 +350,7 @@ static void FUNC(OPNAME ## h264_qpel8_hv_lowpass)(uint8_t *_dst, int16_t *tmp, u
     }\
 }\
 \
-static void FUNC(OPNAME ## h264_qpel16_v_lowpass)(uint8_t *dst, uint8_t *src, int dstStride, int srcStride){\
+static void FUNC(OPNAME ## h264_qpel16_v_lowpass)(uint8_t *dst, const uint8_t *src, int dstStride, int srcStride){\
     FUNC(OPNAME ## h264_qpel8_v_lowpass)(dst                , src                , dstStride, srcStride);\
     FUNC(OPNAME ## h264_qpel8_v_lowpass)(dst+8*sizeof(pixel), src+8*sizeof(pixel), dstStride, srcStride);\
     src += 8*srcStride;\
@@ -359,7 +359,7 @@ static void FUNC(OPNAME ## h264_qpel16_v_lowpass)(uint8_t *dst, uint8_t *src, in
     FUNC(OPNAME ## h264_qpel8_v_lowpass)(dst+8*sizeof(pixel), src+8*sizeof(pixel), dstStride, srcStride);\
 }\
 \
-static void FUNC(OPNAME ## h264_qpel16_h_lowpass)(uint8_t *dst, uint8_t *src, int dstStride, int srcStride){\
+static void FUNC(OPNAME ## h264_qpel16_h_lowpass)(uint8_t *dst, const uint8_t *src, int dstStride, int srcStride){\
     FUNC(OPNAME ## h264_qpel8_h_lowpass)(dst                , src                , dstStride, srcStride);\
     FUNC(OPNAME ## h264_qpel8_h_lowpass)(dst+8*sizeof(pixel), src+8*sizeof(pixel), dstStride, srcStride);\
     src += 8*srcStride;\
@@ -368,7 +368,7 @@ static void FUNC(OPNAME ## h264_qpel16_h_lowpass)(uint8_t *dst, uint8_t *src, in
     FUNC(OPNAME ## h264_qpel8_h_lowpass)(dst+8*sizeof(pixel), src+8*sizeof(pixel), dstStride, srcStride);\
 }\
 \
-static void FUNC(OPNAME ## h264_qpel16_hv_lowpass)(uint8_t *dst, int16_t *tmp, uint8_t *src, int dstStride, int tmpStride, int srcStride){\
+static void FUNC(OPNAME ## h264_qpel16_hv_lowpass)(uint8_t *dst, int16_t *tmp, const uint8_t *src, int dstStride, int tmpStride, int srcStride){\
     FUNC(OPNAME ## h264_qpel8_hv_lowpass)(dst                , tmp  , src                , dstStride, tmpStride, srcStride);\
     FUNC(OPNAME ## h264_qpel8_hv_lowpass)(dst+8*sizeof(pixel), tmp+8, src+8*sizeof(pixel), dstStride, tmpStride, srcStride);\
     src += 8*srcStride;\
@@ -378,31 +378,31 @@ static void FUNC(OPNAME ## h264_qpel16_hv_lowpass)(uint8_t *dst, int16_t *tmp, u
 }\
 
 #define H264_MC(OPNAME, SIZE) \
-static av_unused void FUNCC(OPNAME ## h264_qpel ## SIZE ## _mc00)(uint8_t *dst, uint8_t *src, ptrdiff_t stride)\
+static av_unused void FUNCC(OPNAME ## h264_qpel ## SIZE ## _mc00)(uint8_t *dst, const uint8_t *src, ptrdiff_t stride)\
 {\
     FUNCC(OPNAME ## pixels ## SIZE)(dst, src, stride, SIZE);\
 }\
 \
-static void FUNCC(OPNAME ## h264_qpel ## SIZE ## _mc10)(uint8_t *dst, uint8_t *src, ptrdiff_t stride)\
+static void FUNCC(OPNAME ## h264_qpel ## SIZE ## _mc10)(uint8_t *dst, const uint8_t *src, ptrdiff_t stride)\
 {\
     uint8_t half[SIZE*SIZE*sizeof(pixel)];\
     FUNC(put_h264_qpel ## SIZE ## _h_lowpass)(half, src, SIZE*sizeof(pixel), stride);\
     FUNC(OPNAME ## pixels ## SIZE ## _l2)(dst, src, half, stride, stride, SIZE*sizeof(pixel), SIZE);\
 }\
 \
-static void FUNCC(OPNAME ## h264_qpel ## SIZE ## _mc20)(uint8_t *dst, uint8_t *src, ptrdiff_t stride)\
+static void FUNCC(OPNAME ## h264_qpel ## SIZE ## _mc20)(uint8_t *dst, const uint8_t *src, ptrdiff_t stride)\
 {\
     FUNC(OPNAME ## h264_qpel ## SIZE ## _h_lowpass)(dst, src, stride, stride);\
 }\
 \
-static void FUNCC(OPNAME ## h264_qpel ## SIZE ## _mc30)(uint8_t *dst, uint8_t *src, ptrdiff_t stride)\
+static void FUNCC(OPNAME ## h264_qpel ## SIZE ## _mc30)(uint8_t *dst, const uint8_t *src, ptrdiff_t stride)\
 {\
     uint8_t half[SIZE*SIZE*sizeof(pixel)];\
     FUNC(put_h264_qpel ## SIZE ## _h_lowpass)(half, src, SIZE*sizeof(pixel), stride);\
     FUNC(OPNAME ## pixels ## SIZE ## _l2)(dst, src+sizeof(pixel), half, stride, stride, SIZE*sizeof(pixel), SIZE);\
 }\
 \
-static void FUNCC(OPNAME ## h264_qpel ## SIZE ## _mc01)(uint8_t *dst, uint8_t *src, ptrdiff_t stride)\
+static void FUNCC(OPNAME ## h264_qpel ## SIZE ## _mc01)(uint8_t *dst, const uint8_t *src, ptrdiff_t stride)\
 {\
     uint8_t full[SIZE*(SIZE+5)*sizeof(pixel)];\
     uint8_t * const full_mid= full + SIZE*2*sizeof(pixel);\
@@ -412,7 +412,7 @@ static void FUNCC(OPNAME ## h264_qpel ## SIZE ## _mc01)(uint8_t *dst, uint8_t *s
     FUNC(OPNAME ## pixels ## SIZE ## _l2)(dst, full_mid, half, stride, SIZE*sizeof(pixel), SIZE*sizeof(pixel), SIZE);\
 }\
 \
-static void FUNCC(OPNAME ## h264_qpel ## SIZE ## _mc02)(uint8_t *dst, uint8_t *src, ptrdiff_t stride)\
+static void FUNCC(OPNAME ## h264_qpel ## SIZE ## _mc02)(uint8_t *dst, const uint8_t *src, ptrdiff_t stride)\
 {\
     uint8_t full[SIZE*(SIZE+5)*sizeof(pixel)];\
     uint8_t * const full_mid= full + SIZE*2*sizeof(pixel);\
@@ -420,7 +420,7 @@ static void FUNCC(OPNAME ## h264_qpel ## SIZE ## _mc02)(uint8_t *dst, uint8_t *s
     FUNC(OPNAME ## h264_qpel ## SIZE ## _v_lowpass)(dst, full_mid, stride, SIZE*sizeof(pixel));\
 }\
 \
-static void FUNCC(OPNAME ## h264_qpel ## SIZE ## _mc03)(uint8_t *dst, uint8_t *src, ptrdiff_t stride)\
+static void FUNCC(OPNAME ## h264_qpel ## SIZE ## _mc03)(uint8_t *dst, const uint8_t *src, ptrdiff_t stride)\
 {\
     uint8_t full[SIZE*(SIZE+5)*sizeof(pixel)];\
     uint8_t * const full_mid= full + SIZE*2*sizeof(pixel);\
@@ -430,7 +430,7 @@ static void FUNCC(OPNAME ## h264_qpel ## SIZE ## _mc03)(uint8_t *dst, uint8_t *s
     FUNC(OPNAME ## pixels ## SIZE ## _l2)(dst, full_mid+SIZE*sizeof(pixel), half, stride, SIZE*sizeof(pixel), SIZE*sizeof(pixel), SIZE);\
 }\
 \
-static void FUNCC(OPNAME ## h264_qpel ## SIZE ## _mc11)(uint8_t *dst, uint8_t *src, ptrdiff_t stride)\
+static void FUNCC(OPNAME ## h264_qpel ## SIZE ## _mc11)(uint8_t *dst, const uint8_t *src, ptrdiff_t stride)\
 {\
     uint8_t full[SIZE*(SIZE+5)*sizeof(pixel)];\
     uint8_t * const full_mid= full + SIZE*2*sizeof(pixel);\
@@ -442,7 +442,7 @@ static void FUNCC(OPNAME ## h264_qpel ## SIZE ## _mc11)(uint8_t *dst, uint8_t *s
     FUNC(OPNAME ## pixels ## SIZE ## _l2)(dst, halfH, halfV, stride, SIZE*sizeof(pixel), SIZE*sizeof(pixel), SIZE);\
 }\
 \
-static void FUNCC(OPNAME ## h264_qpel ## SIZE ## _mc31)(uint8_t *dst, uint8_t *src, ptrdiff_t stride)\
+static void FUNCC(OPNAME ## h264_qpel ## SIZE ## _mc31)(uint8_t *dst, const uint8_t *src, ptrdiff_t stride)\
 {\
     uint8_t full[SIZE*(SIZE+5)*sizeof(pixel)];\
     uint8_t * const full_mid= full + SIZE*2*sizeof(pixel);\
@@ -454,7 +454,7 @@ static void FUNCC(OPNAME ## h264_qpel ## SIZE ## _mc31)(uint8_t *dst, uint8_t *s
     FUNC(OPNAME ## pixels ## SIZE ## _l2)(dst, halfH, halfV, stride, SIZE*sizeof(pixel), SIZE*sizeof(pixel), SIZE);\
 }\
 \
-static void FUNCC(OPNAME ## h264_qpel ## SIZE ## _mc13)(uint8_t *dst, uint8_t *src, ptrdiff_t stride)\
+static void FUNCC(OPNAME ## h264_qpel ## SIZE ## _mc13)(uint8_t *dst, const uint8_t *src, ptrdiff_t stride)\
 {\
     uint8_t full[SIZE*(SIZE+5)*sizeof(pixel)];\
     uint8_t * const full_mid= full + SIZE*2*sizeof(pixel);\
@@ -466,7 +466,7 @@ static void FUNCC(OPNAME ## h264_qpel ## SIZE ## _mc13)(uint8_t *dst, uint8_t *s
     FUNC(OPNAME ## pixels ## SIZE ## _l2)(dst, halfH, halfV, stride, SIZE*sizeof(pixel), SIZE*sizeof(pixel), SIZE);\
 }\
 \
-static void FUNCC(OPNAME ## h264_qpel ## SIZE ## _mc33)(uint8_t *dst, uint8_t *src, ptrdiff_t stride)\
+static void FUNCC(OPNAME ## h264_qpel ## SIZE ## _mc33)(uint8_t *dst, const uint8_t *src, ptrdiff_t stride)\
 {\
     uint8_t full[SIZE*(SIZE+5)*sizeof(pixel)];\
     uint8_t * const full_mid= full + SIZE*2*sizeof(pixel);\
@@ -478,13 +478,13 @@ static void FUNCC(OPNAME ## h264_qpel ## SIZE ## _mc33)(uint8_t *dst, uint8_t *s
     FUNC(OPNAME ## pixels ## SIZE ## _l2)(dst, halfH, halfV, stride, SIZE*sizeof(pixel), SIZE*sizeof(pixel), SIZE);\
 }\
 \
-static void FUNCC(OPNAME ## h264_qpel ## SIZE ## _mc22)(uint8_t *dst, uint8_t *src, ptrdiff_t stride)\
+static void FUNCC(OPNAME ## h264_qpel ## SIZE ## _mc22)(uint8_t *dst, const uint8_t *src, ptrdiff_t stride)\
 {\
     int16_t tmp[SIZE*(SIZE+5)*sizeof(pixel)];\
     FUNC(OPNAME ## h264_qpel ## SIZE ## _hv_lowpass)(dst, tmp, src, stride, SIZE*sizeof(pixel), stride);\
 }\
 \
-static void FUNCC(OPNAME ## h264_qpel ## SIZE ## _mc21)(uint8_t *dst, uint8_t *src, ptrdiff_t stride)\
+static void FUNCC(OPNAME ## h264_qpel ## SIZE ## _mc21)(uint8_t *dst, const uint8_t *src, ptrdiff_t stride)\
 {\
     int16_t tmp[SIZE*(SIZE+5)*sizeof(pixel)];\
     uint8_t halfH[SIZE*SIZE*sizeof(pixel)];\
@@ -494,7 +494,7 @@ static void FUNCC(OPNAME ## h264_qpel ## SIZE ## _mc21)(uint8_t *dst, uint8_t *s
     FUNC(OPNAME ## pixels ## SIZE ## _l2)(dst, halfH, halfHV, stride, SIZE*sizeof(pixel), SIZE*sizeof(pixel), SIZE);\
 }\
 \
-static void FUNCC(OPNAME ## h264_qpel ## SIZE ## _mc23)(uint8_t *dst, uint8_t *src, ptrdiff_t stride)\
+static void FUNCC(OPNAME ## h264_qpel ## SIZE ## _mc23)(uint8_t *dst, const uint8_t *src, ptrdiff_t stride)\
 {\
     int16_t tmp[SIZE*(SIZE+5)*sizeof(pixel)];\
     uint8_t halfH[SIZE*SIZE*sizeof(pixel)];\
@@ -504,7 +504,7 @@ static void FUNCC(OPNAME ## h264_qpel ## SIZE ## _mc23)(uint8_t *dst, uint8_t *s
     FUNC(OPNAME ## pixels ## SIZE ## _l2)(dst, halfH, halfHV, stride, SIZE*sizeof(pixel), SIZE*sizeof(pixel), SIZE);\
 }\
 \
-static void FUNCC(OPNAME ## h264_qpel ## SIZE ## _mc12)(uint8_t *dst, uint8_t *src, ptrdiff_t stride)\
+static void FUNCC(OPNAME ## h264_qpel ## SIZE ## _mc12)(uint8_t *dst, const uint8_t *src, ptrdiff_t stride)\
 {\
     uint8_t full[SIZE*(SIZE+5)*sizeof(pixel)];\
     uint8_t * const full_mid= full + SIZE*2*sizeof(pixel);\
@@ -517,7 +517,7 @@ static void FUNCC(OPNAME ## h264_qpel ## SIZE ## _mc12)(uint8_t *dst, uint8_t *s
     FUNC(OPNAME ## pixels ## SIZE ## _l2)(dst, halfV, halfHV, stride, SIZE*sizeof(pixel), SIZE*sizeof(pixel), SIZE);\
 }\
 \
-static void FUNCC(OPNAME ## h264_qpel ## SIZE ## _mc32)(uint8_t *dst, uint8_t *src, ptrdiff_t stride)\
+static void FUNCC(OPNAME ## h264_qpel ## SIZE ## _mc32)(uint8_t *dst, const uint8_t *src, ptrdiff_t stride)\
 {\
     uint8_t full[SIZE*(SIZE+5)*sizeof(pixel)];\
     uint8_t * const full_mid= full + SIZE*2*sizeof(pixel);\
diff --git a/libavcodec/ppc/h264qpel.c b/libavcodec/ppc/h264qpel.c
index 3963344dce..f840277c88 100644
--- a/libavcodec/ppc/h264qpel.c
+++ b/libavcodec/ppc/h264qpel.c
@@ -66,50 +66,50 @@
 #undef PREFIX_h264_qpel16_hv_lowpass_num
 
 #define H264_MC(OPNAME, SIZE, CODETYPE) \
-static void OPNAME ## h264_qpel ## SIZE ## _mc00_ ## CODETYPE (uint8_t *dst, uint8_t *src, ptrdiff_t stride)\
+static void OPNAME ## h264_qpel ## SIZE ## _mc00_ ## CODETYPE (uint8_t *dst, const uint8_t *src, ptrdiff_t stride)\
 {\
     ff_ ## OPNAME ## pixels ## SIZE ## _ ## CODETYPE(dst, src, stride, SIZE);\
 }\
 \
-static void OPNAME ## h264_qpel ## SIZE ## _mc10_ ## CODETYPE(uint8_t *dst, uint8_t *src, ptrdiff_t stride)\
+static void OPNAME ## h264_qpel ## SIZE ## _mc10_ ## CODETYPE(uint8_t *dst, const uint8_t *src, ptrdiff_t stride)\
 { \
     DECLARE_ALIGNED(16, uint8_t, half)[SIZE*SIZE];\
     put_h264_qpel ## SIZE ## _h_lowpass_ ## CODETYPE(half, src, SIZE, stride);\
     OPNAME ## pixels ## SIZE ## _l2_ ## CODETYPE(dst, src, half, stride, stride, SIZE);\
 }\
 \
-static void OPNAME ## h264_qpel ## SIZE ## _mc20_ ## CODETYPE(uint8_t *dst, uint8_t *src, ptrdiff_t stride)\
+static void OPNAME ## h264_qpel ## SIZE ## _mc20_ ## CODETYPE(uint8_t *dst, const uint8_t *src, ptrdiff_t stride)\
 {\
     OPNAME ## h264_qpel ## SIZE ## _h_lowpass_ ## CODETYPE(dst, src, stride, stride);\
 }\
 \
-static void OPNAME ## h264_qpel ## SIZE ## _mc30_ ## CODETYPE(uint8_t *dst, uint8_t *src, ptrdiff_t stride)\
+static void OPNAME ## h264_qpel ## SIZE ## _mc30_ ## CODETYPE(uint8_t *dst, const uint8_t *src, ptrdiff_t stride)\
 {\
     DECLARE_ALIGNED(16, uint8_t, half)[SIZE*SIZE];\
     put_h264_qpel ## SIZE ## _h_lowpass_ ## CODETYPE(half, src, SIZE, stride);\
     OPNAME ## pixels ## SIZE ## _l2_ ## CODETYPE(dst, src+1, half, stride, stride, SIZE);\
 }\
 \
-static void OPNAME ## h264_qpel ## SIZE ## _mc01_ ## CODETYPE(uint8_t *dst, uint8_t *src, ptrdiff_t stride)\
+static void OPNAME ## h264_qpel ## SIZE ## _mc01_ ## CODETYPE(uint8_t *dst, const uint8_t *src, ptrdiff_t stride)\
 {\
     DECLARE_ALIGNED(16, uint8_t, half)[SIZE*SIZE];\
     put_h264_qpel ## SIZE ## _v_lowpass_ ## CODETYPE(half, src, SIZE, stride);\
     OPNAME ## pixels ## SIZE ## _l2_ ## CODETYPE(dst, src, half, stride, stride, SIZE);\
 }\
 \
-static void OPNAME ## h264_qpel ## SIZE ## _mc02_ ## CODETYPE(uint8_t *dst, uint8_t *src, ptrdiff_t stride)\
+static void OPNAME ## h264_qpel ## SIZE ## _mc02_ ## CODETYPE(uint8_t *dst, const uint8_t *src, ptrdiff_t stride)\
 {\
     OPNAME ## h264_qpel ## SIZE ## _v_lowpass_ ## CODETYPE(dst, src, stride, stride);\
 }\
 \
-static void OPNAME ## h264_qpel ## SIZE ## _mc03_ ## CODETYPE(uint8_t *dst, uint8_t *src, ptrdiff_t stride)\
+static void OPNAME ## h264_qpel ## SIZE ## _mc03_ ## CODETYPE(uint8_t *dst, const uint8_t *src, ptrdiff_t stride)\
 {\
     DECLARE_ALIGNED(16, uint8_t, half)[SIZE*SIZE];\
     put_h264_qpel ## SIZE ## _v_lowpass_ ## CODETYPE(half, src, SIZE, stride);\
     OPNAME ## pixels ## SIZE ## _l2_ ## CODETYPE(dst, src+stride, half, stride, stride, SIZE);\
 }\
 \
-static void OPNAME ## h264_qpel ## SIZE ## _mc11_ ## CODETYPE(uint8_t *dst, uint8_t *src, ptrdiff_t stride)\
+static void OPNAME ## h264_qpel ## SIZE ## _mc11_ ## CODETYPE(uint8_t *dst, const uint8_t *src, ptrdiff_t stride)\
 {\
     DECLARE_ALIGNED(16, uint8_t, halfH)[SIZE*SIZE];\
     DECLARE_ALIGNED(16, uint8_t, halfV)[SIZE*SIZE];\
@@ -118,7 +118,7 @@ static void OPNAME ## h264_qpel ## SIZE ## _mc11_ ## CODETYPE(uint8_t *dst, uint
     OPNAME ## pixels ## SIZE ## _l2_ ## CODETYPE(dst, halfH, halfV, stride, SIZE, SIZE);\
 }\
 \
-static void OPNAME ## h264_qpel ## SIZE ## _mc31_ ## CODETYPE(uint8_t *dst, uint8_t *src, ptrdiff_t stride)\
+static void OPNAME ## h264_qpel ## SIZE ## _mc31_ ## CODETYPE(uint8_t *dst, const uint8_t *src, ptrdiff_t stride)\
 {\
     DECLARE_ALIGNED(16, uint8_t, halfH)[SIZE*SIZE];\
     DECLARE_ALIGNED(16, uint8_t, halfV)[SIZE*SIZE];\
@@ -127,7 +127,7 @@ static void OPNAME ## h264_qpel ## SIZE ## _mc31_ ## CODETYPE(uint8_t *dst, uint
     OPNAME ## pixels ## SIZE ## _l2_ ## CODETYPE(dst, halfH, halfV, stride, SIZE, SIZE);\
 }\
 \
-static void OPNAME ## h264_qpel ## SIZE ## _mc13_ ## CODETYPE(uint8_t *dst, uint8_t *src, ptrdiff_t stride)\
+static void OPNAME ## h264_qpel ## SIZE ## _mc13_ ## CODETYPE(uint8_t *dst, const uint8_t *src, ptrdiff_t stride)\
 {\
     DECLARE_ALIGNED(16, uint8_t, halfH)[SIZE*SIZE];\
     DECLARE_ALIGNED(16, uint8_t, halfV)[SIZE*SIZE];\
@@ -136,7 +136,7 @@ static void OPNAME ## h264_qpel ## SIZE ## _mc13_ ## CODETYPE(uint8_t *dst, uint
     OPNAME ## pixels ## SIZE ## _l2_ ## CODETYPE(dst, halfH, halfV, stride, SIZE, SIZE);\
 }\
 \
-static void OPNAME ## h264_qpel ## SIZE ## _mc33_ ## CODETYPE(uint8_t *dst, uint8_t *src, ptrdiff_t stride)\
+static void OPNAME ## h264_qpel ## SIZE ## _mc33_ ## CODETYPE(uint8_t *dst, const uint8_t *src, ptrdiff_t stride)\
 {\
     DECLARE_ALIGNED(16, uint8_t, halfH)[SIZE*SIZE];\
     DECLARE_ALIGNED(16, uint8_t, halfV)[SIZE*SIZE];\
@@ -145,13 +145,13 @@ static void OPNAME ## h264_qpel ## SIZE ## _mc33_ ## CODETYPE(uint8_t *dst, uint
     OPNAME ## pixels ## SIZE ## _l2_ ## CODETYPE(dst, halfH, halfV, stride, SIZE, SIZE);\
 }\
 \
-static void OPNAME ## h264_qpel ## SIZE ## _mc22_ ## CODETYPE(uint8_t *dst, uint8_t *src, ptrdiff_t stride)\
+static void OPNAME ## h264_qpel ## SIZE ## _mc22_ ## CODETYPE(uint8_t *dst, const uint8_t *src, ptrdiff_t stride)\
 {\
     DECLARE_ALIGNED(16, int16_t, tmp)[SIZE*(SIZE+8)];\
     OPNAME ## h264_qpel ## SIZE ## _hv_lowpass_ ## CODETYPE(dst, tmp, src, stride, SIZE, stride);\
 }\
 \
-static void OPNAME ## h264_qpel ## SIZE ## _mc21_ ## CODETYPE(uint8_t *dst, uint8_t *src, ptrdiff_t stride)\
+static void OPNAME ## h264_qpel ## SIZE ## _mc21_ ## CODETYPE(uint8_t *dst, const uint8_t *src, ptrdiff_t stride)\
 {\
     DECLARE_ALIGNED(16, uint8_t, halfH)[SIZE*SIZE];\
     DECLARE_ALIGNED(16, uint8_t, halfHV)[SIZE*SIZE];\
@@ -161,7 +161,7 @@ static void OPNAME ## h264_qpel ## SIZE ## _mc21_ ## CODETYPE(uint8_t *dst, uint
     OPNAME ## pixels ## SIZE ## _l2_ ## CODETYPE(dst, halfH, halfHV, stride, SIZE, SIZE);\
 }\
 \
-static void OPNAME ## h264_qpel ## SIZE ## _mc23_ ## CODETYPE(uint8_t *dst, uint8_t *src, ptrdiff_t stride)\
+static void OPNAME ## h264_qpel ## SIZE ## _mc23_ ## CODETYPE(uint8_t *dst, const uint8_t *src, ptrdiff_t stride)\
 {\
     DECLARE_ALIGNED(16, uint8_t, halfH)[SIZE*SIZE];\
     DECLARE_ALIGNED(16, uint8_t, halfHV)[SIZE*SIZE];\
@@ -171,7 +171,7 @@ static void OPNAME ## h264_qpel ## SIZE ## _mc23_ ## CODETYPE(uint8_t *dst, uint
     OPNAME ## pixels ## SIZE ## _l2_ ## CODETYPE(dst, halfH, halfHV, stride, SIZE, SIZE);\
 }\
 \
-static void OPNAME ## h264_qpel ## SIZE ## _mc12_ ## CODETYPE(uint8_t *dst, uint8_t *src, ptrdiff_t stride)\
+static void OPNAME ## h264_qpel ## SIZE ## _mc12_ ## CODETYPE(uint8_t *dst, const uint8_t *src, ptrdiff_t stride)\
 {\
     DECLARE_ALIGNED(16, uint8_t, halfV)[SIZE*SIZE];\
     DECLARE_ALIGNED(16, uint8_t, halfHV)[SIZE*SIZE];\
@@ -181,7 +181,7 @@ static void OPNAME ## h264_qpel ## SIZE ## _mc12_ ## CODETYPE(uint8_t *dst, uint
     OPNAME ## pixels ## SIZE ## _l2_ ## CODETYPE(dst, halfV, halfHV, stride, SIZE, SIZE);\
 }\
 \
-static void OPNAME ## h264_qpel ## SIZE ## _mc32_ ## CODETYPE(uint8_t *dst, uint8_t *src, ptrdiff_t stride)\
+static void OPNAME ## h264_qpel ## SIZE ## _mc32_ ## CODETYPE(uint8_t *dst, const uint8_t *src, ptrdiff_t stride)\
 {\
     DECLARE_ALIGNED(16, uint8_t, halfV)[SIZE*SIZE];\
     DECLARE_ALIGNED(16, uint8_t, halfHV)[SIZE*SIZE];\
diff --git a/libavcodec/ppc/h264qpel_template.c b/libavcodec/ppc/h264qpel_template.c
index 4df1d09768..fe83146e63 100644
--- a/libavcodec/ppc/h264qpel_template.c
+++ b/libavcodec/ppc/h264qpel_template.c
@@ -28,7 +28,10 @@
 
 /* this code assume stride % 16 == 0 */
 #ifdef PREFIX_h264_qpel16_h_lowpass_altivec
-static void PREFIX_h264_qpel16_h_lowpass_altivec(uint8_t * dst, uint8_t * src, int dstStride, int srcStride) {
+static void PREFIX_h264_qpel16_h_lowpass_altivec(uint8_t *dst,
+                                                 const uint8_t *src,
+                                                 int dstStride, int srcStride)
+{
     register int i;
 
     LOAD_ZERO;
@@ -168,7 +171,10 @@ static void PREFIX_h264_qpel16_h_lowpass_altivec(uint8_t * dst, uint8_t * src, i
 
 /* this code assume stride % 16 == 0 */
 #ifdef PREFIX_h264_qpel16_v_lowpass_altivec
-static void PREFIX_h264_qpel16_v_lowpass_altivec(uint8_t * dst, uint8_t * src, int dstStride, int srcStride) {
+static void PREFIX_h264_qpel16_v_lowpass_altivec(uint8_t *dst,
+                                                 const uint8_t *src,
+                                                 int dstStride, int srcStride)
+{
     register int i;
 
     LOAD_ZERO;
@@ -178,7 +184,7 @@ static void PREFIX_h264_qpel16_v_lowpass_altivec(uint8_t * dst, uint8_t * src, i
     const vec_s16 v5ss = vec_splat_s16(5);
     const vec_s16 v16ss = vec_sl(vec_splat_s16(1),vec_splat_u16(4));
 
-    uint8_t *srcbis = src - (srcStride * 2);
+    const uint8_t *srcbis = src - (srcStride * 2);
 
     const vec_u8 srcM2a = vec_ld(0, srcbis);
     const vec_u8 srcM2b = vec_ld(16, srcbis);
@@ -275,7 +281,11 @@ static void PREFIX_h264_qpel16_v_lowpass_altivec(uint8_t * dst, uint8_t * src, i
 
 /* this code assume stride % 16 == 0 *and* tmp is properly aligned */
 #ifdef PREFIX_h264_qpel16_hv_lowpass_altivec
-static void PREFIX_h264_qpel16_hv_lowpass_altivec(uint8_t * dst, int16_t * tmp, uint8_t * src, int dstStride, int tmpStride, int srcStride) {
+static void PREFIX_h264_qpel16_hv_lowpass_altivec(uint8_t *dst, int16_t *tmp,
+                                                  const uint8_t *src,
+                                                  int dstStride, int tmpStride,
+                                                  int srcStride)
+{
     register int i;
     LOAD_ZERO;
     const vec_u8 permM2 = vec_lvsl(-2, src);
diff --git a/libavcodec/qpeldsp.c b/libavcodec/qpeldsp.c
index d5afac783c..1d0422a382 100644
--- a/libavcodec/qpeldsp.c
+++ b/libavcodec/qpeldsp.c
@@ -37,7 +37,7 @@
 #include "qpel_template.c"
 
 #define QPEL_MC(r, OPNAME, RND, OP)                                           \
-static void OPNAME ## mpeg4_qpel8_h_lowpass(uint8_t *dst, uint8_t *src,       \
+static void OPNAME ## mpeg4_qpel8_h_lowpass(uint8_t *dst, const uint8_t *src, \
                                             int dstStride, int srcStride,     \
                                             int h)                            \
 {                                                                             \
@@ -58,7 +58,7 @@ static void OPNAME ## mpeg4_qpel8_h_lowpass(uint8_t *dst, uint8_t *src,       \
     }                                                                         \
 }                                                                             \
                                                                               \
-static void OPNAME ## mpeg4_qpel8_v_lowpass(uint8_t *dst, uint8_t *src,       \
+static void OPNAME ## mpeg4_qpel8_v_lowpass(uint8_t *dst, const uint8_t *src, \
                                             int dstStride, int srcStride)     \
 {                                                                             \
     const uint8_t *cm = ff_crop_tab + MAX_NEG_CROP;                           \
@@ -88,7 +88,8 @@ static void OPNAME ## mpeg4_qpel8_v_lowpass(uint8_t *dst, uint8_t *src,       \
     }                                                                         \
 }                                                                             \
                                                                               \
-static void OPNAME ## mpeg4_qpel16_h_lowpass(uint8_t *dst, uint8_t *src,      \
+static void OPNAME ## mpeg4_qpel16_h_lowpass(uint8_t *dst,                    \
+                                             const uint8_t *src,              \
                                              int dstStride, int srcStride,    \
                                              int h)                           \
 {                                                                             \
@@ -117,7 +118,8 @@ static void OPNAME ## mpeg4_qpel16_h_lowpass(uint8_t *dst, uint8_t *src,      \
     }                                                                         \
 }                                                                             \
                                                                               \
-static void OPNAME ## mpeg4_qpel16_v_lowpass(uint8_t *dst, uint8_t *src,      \
+static void OPNAME ## mpeg4_qpel16_v_lowpass(uint8_t *dst,                    \
+                                             const uint8_t *src,              \
                                              int dstStride, int srcStride)    \
 {                                                                             \
     const uint8_t *cm = ff_crop_tab + MAX_NEG_CROP;                           \
@@ -163,7 +165,7 @@ static void OPNAME ## mpeg4_qpel16_v_lowpass(uint8_t *dst, uint8_t *src,      \
     }                                                                         \
 }                                                                             \
                                                                               \
-static void OPNAME ## qpel8_mc10_c(uint8_t *dst, uint8_t *src,                \
+static void OPNAME ## qpel8_mc10_c(uint8_t *dst, const uint8_t *src,          \
                                    ptrdiff_t stride)                          \
 {                                                                             \
     uint8_t half[64];                                                         \
@@ -172,13 +174,13 @@ static void OPNAME ## qpel8_mc10_c(uint8_t *dst, uint8_t *src,                \
     OPNAME ## pixels8_l2_8(dst, src, half, stride, stride, 8, 8);             \
 }                                                                             \
                                                                               \
-static void OPNAME ## qpel8_mc20_c(uint8_t *dst, uint8_t *src,                \
+static void OPNAME ## qpel8_mc20_c(uint8_t *dst, const uint8_t *src,          \
                                    ptrdiff_t stride)                          \
 {                                                                             \
     OPNAME ## mpeg4_qpel8_h_lowpass(dst, src, stride, stride, 8);             \
 }                                                                             \
                                                                               \
-static void OPNAME ## qpel8_mc30_c(uint8_t *dst, uint8_t *src,                \
+static void OPNAME ## qpel8_mc30_c(uint8_t *dst, const uint8_t *src,          \
                                    ptrdiff_t stride)                          \
 {                                                                             \
     uint8_t half[64];                                                         \
@@ -187,7 +189,7 @@ static void OPNAME ## qpel8_mc30_c(uint8_t *dst, uint8_t *src,                \
     OPNAME ## pixels8_l2_8(dst, src + 1, half, stride, stride, 8, 8);         \
 }                                                                             \
                                                                               \
-static void OPNAME ## qpel8_mc01_c(uint8_t *dst, uint8_t *src,                \
+static void OPNAME ## qpel8_mc01_c(uint8_t *dst, const uint8_t *src,          \
                                    ptrdiff_t stride)                          \
 {                                                                             \
     uint8_t full[16 * 9];                                                     \
@@ -198,7 +200,7 @@ static void OPNAME ## qpel8_mc01_c(uint8_t *dst, uint8_t *src,                \
     OPNAME ## pixels8_l2_8(dst, full, half, stride, 16, 8, 8);                \
 }                                                                             \
                                                                               \
-static void OPNAME ## qpel8_mc02_c(uint8_t *dst, uint8_t *src,                \
+static void OPNAME ## qpel8_mc02_c(uint8_t *dst, const uint8_t *src,          \
                                    ptrdiff_t stride)                          \
 {                                                                             \
     uint8_t full[16 * 9];                                                     \
@@ -207,7 +209,7 @@ static void OPNAME ## qpel8_mc02_c(uint8_t *dst, uint8_t *src,                \
     OPNAME ## mpeg4_qpel8_v_lowpass(dst, full, stride, 16);                   \
 }                                                                             \
                                                                               \
-static void OPNAME ## qpel8_mc03_c(uint8_t *dst, uint8_t *src,                \
+static void OPNAME ## qpel8_mc03_c(uint8_t *dst, const uint8_t *src,          \
                                    ptrdiff_t stride)                          \
 {                                                                             \
     uint8_t full[16 * 9];                                                     \
@@ -218,7 +220,7 @@ static void OPNAME ## qpel8_mc03_c(uint8_t *dst, uint8_t *src,                \
     OPNAME ## pixels8_l2_8(dst, full + 16, half, stride, 16, 8, 8);           \
 }                                                                             \
                                                                               \
-void ff_ ## OPNAME ## qpel8_mc11_old_c(uint8_t *dst, uint8_t *src,            \
+void ff_ ## OPNAME ## qpel8_mc11_old_c(uint8_t *dst, const uint8_t *src,      \
                                        ptrdiff_t stride)                      \
 {                                                                             \
     uint8_t full[16 * 9];                                                     \
@@ -234,7 +236,7 @@ void ff_ ## OPNAME ## qpel8_mc11_old_c(uint8_t *dst, uint8_t *src,            \
                            stride, 16, 8, 8, 8, 8);                           \
 }                                                                             \
                                                                               \
-static void OPNAME ## qpel8_mc11_c(uint8_t *dst, uint8_t *src,                \
+static void OPNAME ## qpel8_mc11_c(uint8_t *dst, const uint8_t *src,          \
                                    ptrdiff_t stride)                          \
 {                                                                             \
     uint8_t full[16 * 9];                                                     \
@@ -248,7 +250,7 @@ static void OPNAME ## qpel8_mc11_c(uint8_t *dst, uint8_t *src,                \
     OPNAME ## pixels8_l2_8(dst, halfH, halfHV, stride, 8, 8, 8);              \
 }                                                                             \
                                                                               \
-void ff_ ## OPNAME ## qpel8_mc31_old_c(uint8_t *dst, uint8_t *src,            \
+void ff_ ## OPNAME ## qpel8_mc31_old_c(uint8_t *dst, const uint8_t *src,      \
                                        ptrdiff_t stride)                      \
 {                                                                             \
     uint8_t full[16 * 9];                                                     \
@@ -264,7 +266,7 @@ void ff_ ## OPNAME ## qpel8_mc31_old_c(uint8_t *dst, uint8_t *src,            \
                            stride, 16, 8, 8, 8, 8);                           \
 }                                                                             \
                                                                               \
-static void OPNAME ## qpel8_mc31_c(uint8_t *dst, uint8_t *src,                \
+static void OPNAME ## qpel8_mc31_c(uint8_t *dst, const uint8_t *src,          \
                                    ptrdiff_t stride)                          \
 {                                                                             \
     uint8_t full[16 * 9];                                                     \
@@ -278,7 +280,7 @@ static void OPNAME ## qpel8_mc31_c(uint8_t *dst, uint8_t *src,                \
     OPNAME ## pixels8_l2_8(dst, halfH, halfHV, stride, 8, 8, 8);              \
 }                                                                             \
                                                                               \
-void ff_ ## OPNAME ## qpel8_mc13_old_c(uint8_t *dst, uint8_t *src,            \
+void ff_ ## OPNAME ## qpel8_mc13_old_c(uint8_t *dst, const uint8_t *src,      \
                                        ptrdiff_t stride)                      \
 {                                                                             \
     uint8_t full[16 * 9];                                                     \
@@ -294,7 +296,7 @@ void ff_ ## OPNAME ## qpel8_mc13_old_c(uint8_t *dst, uint8_t *src,            \
                            stride, 16, 8, 8, 8, 8);                           \
 }                                                                             \
                                                                               \
-static void OPNAME ## qpel8_mc13_c(uint8_t *dst, uint8_t *src,                \
+static void OPNAME ## qpel8_mc13_c(uint8_t *dst, const uint8_t *src,    \
                                    ptrdiff_t stride)                          \
 {                                                                             \
     uint8_t full[16 * 9];                                                     \
@@ -308,7 +310,7 @@ static void OPNAME ## qpel8_mc13_c(uint8_t *dst, uint8_t *src,                \
     OPNAME ## pixels8_l2_8(dst, halfH + 8, halfHV, stride, 8, 8, 8);          \
 }                                                                             \
                                                                               \
-void ff_ ## OPNAME ## qpel8_mc33_old_c(uint8_t *dst, uint8_t *src,            \
+void ff_ ## OPNAME ## qpel8_mc33_old_c(uint8_t *dst, const uint8_t *src,      \
                                        ptrdiff_t stride)                      \
 {                                                                             \
     uint8_t full[16 * 9];                                                     \
@@ -324,7 +326,7 @@ void ff_ ## OPNAME ## qpel8_mc33_old_c(uint8_t *dst, uint8_t *src,            \
                            stride, 16, 8, 8, 8, 8);                           \
 }                                                                             \
                                                                               \
-static void OPNAME ## qpel8_mc33_c(uint8_t *dst, uint8_t *src,                \
+static void OPNAME ## qpel8_mc33_c(uint8_t *dst, const uint8_t *src,          \
                                    ptrdiff_t stride)                          \
 {                                                                             \
     uint8_t full[16 * 9];                                                     \
@@ -338,7 +340,7 @@ static void OPNAME ## qpel8_mc33_c(uint8_t *dst, uint8_t *src,                \
     OPNAME ## pixels8_l2_8(dst, halfH + 8, halfHV, stride, 8, 8, 8);          \
 }                                                                             \
                                                                               \
-static void OPNAME ## qpel8_mc21_c(uint8_t *dst, uint8_t *src,                \
+static void OPNAME ## qpel8_mc21_c(uint8_t *dst, const uint8_t *src,          \
                                    ptrdiff_t stride)                          \
 {                                                                             \
     uint8_t halfH[72];                                                        \
@@ -349,7 +351,7 @@ static void OPNAME ## qpel8_mc21_c(uint8_t *dst, uint8_t *src,                \
     OPNAME ## pixels8_l2_8(dst, halfH, halfHV, stride, 8, 8, 8);              \
 }                                                                             \
                                                                               \
-static void OPNAME ## qpel8_mc23_c(uint8_t *dst, uint8_t *src,                \
+static void OPNAME ## qpel8_mc23_c(uint8_t *dst, const uint8_t *src,          \
                                    ptrdiff_t stride)                          \
 {                                                                             \
     uint8_t halfH[72];                                                        \
@@ -360,7 +362,7 @@ static void OPNAME ## qpel8_mc23_c(uint8_t *dst, uint8_t *src,                \
     OPNAME ## pixels8_l2_8(dst, halfH + 8, halfHV, stride, 8, 8, 8);          \
 }                                                                             \
                                                                               \
-void ff_ ## OPNAME ## qpel8_mc12_old_c(uint8_t *dst, uint8_t *src,            \
+void ff_ ## OPNAME ## qpel8_mc12_old_c(uint8_t *dst, const uint8_t *src,      \
                                        ptrdiff_t stride)                      \
 {                                                                             \
     uint8_t full[16 * 9];                                                     \
@@ -375,7 +377,7 @@ void ff_ ## OPNAME ## qpel8_mc12_old_c(uint8_t *dst, uint8_t *src,            \
     OPNAME ## pixels8_l2_8(dst, halfV, halfHV, stride, 8, 8, 8);              \
 }                                                                             \
                                                                               \
-static void OPNAME ## qpel8_mc12_c(uint8_t *dst, uint8_t *src,                \
+static void OPNAME ## qpel8_mc12_c(uint8_t *dst, const uint8_t *src,          \
                                    ptrdiff_t stride)                          \
 {                                                                             \
     uint8_t full[16 * 9];                                                     \
@@ -387,7 +389,7 @@ static void OPNAME ## qpel8_mc12_c(uint8_t *dst, uint8_t *src,                \
     OPNAME ## mpeg4_qpel8_v_lowpass(dst, halfH, stride, 8);                   \
 }                                                                             \
                                                                               \
-void ff_ ## OPNAME ## qpel8_mc32_old_c(uint8_t *dst, uint8_t *src,            \
+void ff_ ## OPNAME ## qpel8_mc32_old_c(uint8_t *dst, const uint8_t *src,      \
                                        ptrdiff_t stride)                      \
 {                                                                             \
     uint8_t full[16 * 9];                                                     \
@@ -402,7 +404,7 @@ void ff_ ## OPNAME ## qpel8_mc32_old_c(uint8_t *dst, uint8_t *src,            \
     OPNAME ## pixels8_l2_8(dst, halfV, halfHV, stride, 8, 8, 8);              \
 }                                                                             \
                                                                               \
-static void OPNAME ## qpel8_mc32_c(uint8_t *dst, uint8_t *src,                \
+static void OPNAME ## qpel8_mc32_c(uint8_t *dst, const uint8_t *src,          \
                                    ptrdiff_t stride)                          \
 {                                                                             \
     uint8_t full[16 * 9];                                                     \
@@ -414,7 +416,7 @@ static void OPNAME ## qpel8_mc32_c(uint8_t *dst, uint8_t *src,                \
     OPNAME ## mpeg4_qpel8_v_lowpass(dst, halfH, stride, 8);                   \
 }                                                                             \
                                                                               \
-static void OPNAME ## qpel8_mc22_c(uint8_t *dst, uint8_t *src,                \
+static void OPNAME ## qpel8_mc22_c(uint8_t *dst, const uint8_t *src,          \
                                    ptrdiff_t stride)                          \
 {                                                                             \
     uint8_t halfH[72];                                                        \
@@ -423,7 +425,7 @@ static void OPNAME ## qpel8_mc22_c(uint8_t *dst, uint8_t *src,                \
     OPNAME ## mpeg4_qpel8_v_lowpass(dst, halfH, stride, 8);                   \
 }                                                                             \
                                                                               \
-static void OPNAME ## qpel16_mc10_c(uint8_t *dst, uint8_t *src,               \
+static void OPNAME ## qpel16_mc10_c(uint8_t *dst, const uint8_t *src,         \
                                     ptrdiff_t stride)                         \
 {                                                                             \
     uint8_t half[256];                                                        \
@@ -432,13 +434,13 @@ static void OPNAME ## qpel16_mc10_c(uint8_t *dst, uint8_t *src,               \
     OPNAME ## pixels16_l2_8(dst, src, half, stride, stride, 16, 16);          \
 }                                                                             \
                                                                               \
-static void OPNAME ## qpel16_mc20_c(uint8_t *dst, uint8_t *src,               \
+static void OPNAME ## qpel16_mc20_c(uint8_t *dst, const uint8_t *src,         \
                                     ptrdiff_t stride)                         \
 {                                                                             \
     OPNAME ## mpeg4_qpel16_h_lowpass(dst, src, stride, stride, 16);           \
 }                                                                             \
                                                                               \
-static void OPNAME ## qpel16_mc30_c(uint8_t *dst, uint8_t *src,               \
+static void OPNAME ## qpel16_mc30_c(uint8_t *dst, const uint8_t *src,         \
                                     ptrdiff_t stride)                         \
 {                                                                             \
     uint8_t half[256];                                                        \
@@ -447,7 +449,7 @@ static void OPNAME ## qpel16_mc30_c(uint8_t *dst, uint8_t *src,               \
     OPNAME ## pixels16_l2_8(dst, src + 1, half, stride, stride, 16, 16);      \
 }                                                                             \
                                                                               \
-static void OPNAME ## qpel16_mc01_c(uint8_t *dst, uint8_t *src,               \
+static void OPNAME ## qpel16_mc01_c(uint8_t *dst, const uint8_t *src,         \
                                     ptrdiff_t stride)                         \
 {                                                                             \
     uint8_t full[24 * 17];                                                    \
@@ -458,7 +460,7 @@ static void OPNAME ## qpel16_mc01_c(uint8_t *dst, uint8_t *src,               \
     OPNAME ## pixels16_l2_8(dst, full, half, stride, 24, 16, 16);             \
 }                                                                             \
                                                                               \
-static void OPNAME ## qpel16_mc02_c(uint8_t *dst, uint8_t *src,               \
+static void OPNAME ## qpel16_mc02_c(uint8_t *dst, const uint8_t *src,         \
                                     ptrdiff_t stride)                         \
 {                                                                             \
     uint8_t full[24 * 17];                                                    \
@@ -467,7 +469,7 @@ static void OPNAME ## qpel16_mc02_c(uint8_t *dst, uint8_t *src,               \
     OPNAME ## mpeg4_qpel16_v_lowpass(dst, full, stride, 24);                  \
 }                                                                             \
                                                                               \
-static void OPNAME ## qpel16_mc03_c(uint8_t *dst, uint8_t *src,               \
+static void OPNAME ## qpel16_mc03_c(uint8_t *dst, const uint8_t *src,         \
                                     ptrdiff_t stride)                         \
 {                                                                             \
     uint8_t full[24 * 17];                                                    \
@@ -478,7 +480,7 @@ static void OPNAME ## qpel16_mc03_c(uint8_t *dst, uint8_t *src,               \
     OPNAME ## pixels16_l2_8(dst, full + 24, half, stride, 24, 16, 16);        \
 }                                                                             \
                                                                               \
-void ff_ ## OPNAME ## qpel16_mc11_old_c(uint8_t *dst, uint8_t *src,           \
+void ff_ ## OPNAME ## qpel16_mc11_old_c(uint8_t *dst, const uint8_t *src,     \
                                         ptrdiff_t stride)                     \
 {                                                                             \
     uint8_t full[24 * 17];                                                    \
@@ -494,7 +496,7 @@ void ff_ ## OPNAME ## qpel16_mc11_old_c(uint8_t *dst, uint8_t *src,           \
                             stride, 24, 16, 16, 16, 16);                      \
 }                                                                             \
                                                                               \
-static void OPNAME ## qpel16_mc11_c(uint8_t *dst, uint8_t *src,               \
+static void OPNAME ## qpel16_mc11_c(uint8_t *dst, const uint8_t *src,         \
                                     ptrdiff_t stride)                         \
 {                                                                             \
     uint8_t full[24 * 17];                                                    \
@@ -508,7 +510,7 @@ static void OPNAME ## qpel16_mc11_c(uint8_t *dst, uint8_t *src,               \
     OPNAME ## pixels16_l2_8(dst, halfH, halfHV, stride, 16, 16, 16);          \
 }                                                                             \
                                                                               \
-void ff_ ## OPNAME ## qpel16_mc31_old_c(uint8_t *dst, uint8_t *src,           \
+void ff_ ## OPNAME ## qpel16_mc31_old_c(uint8_t *dst, const uint8_t *src,     \
                                         ptrdiff_t stride)                     \
 {                                                                             \
     uint8_t full[24 * 17];                                                    \
@@ -524,7 +526,7 @@ void ff_ ## OPNAME ## qpel16_mc31_old_c(uint8_t *dst, uint8_t *src,           \
                             stride, 24, 16, 16, 16, 16);                      \
 }                                                                             \
                                                                               \
-static void OPNAME ## qpel16_mc31_c(uint8_t *dst, uint8_t *src,               \
+static void OPNAME ## qpel16_mc31_c(uint8_t *dst, const uint8_t *src,         \
                                     ptrdiff_t stride)                         \
 {                                                                             \
     uint8_t full[24 * 17];                                                    \
@@ -538,7 +540,7 @@ static void OPNAME ## qpel16_mc31_c(uint8_t *dst, uint8_t *src,               \
     OPNAME ## pixels16_l2_8(dst, halfH, halfHV, stride, 16, 16, 16);          \
 }                                                                             \
                                                                               \
-void ff_ ## OPNAME ## qpel16_mc13_old_c(uint8_t *dst, uint8_t *src,           \
+void ff_ ## OPNAME ## qpel16_mc13_old_c(uint8_t *dst, const uint8_t *src,     \
                                         ptrdiff_t stride)                     \
 {                                                                             \
     uint8_t full[24 * 17];                                                    \
@@ -554,7 +556,7 @@ void ff_ ## OPNAME ## qpel16_mc13_old_c(uint8_t *dst, uint8_t *src,           \
                             stride, 24, 16, 16, 16, 16);                      \
 }                                                                             \
                                                                               \
-static void OPNAME ## qpel16_mc13_c(uint8_t *dst, uint8_t *src,               \
+static void OPNAME ## qpel16_mc13_c(uint8_t *dst, const uint8_t *src,         \
                                     ptrdiff_t stride)                         \
 {                                                                             \
     uint8_t full[24 * 17];                                                    \
@@ -568,7 +570,7 @@ static void OPNAME ## qpel16_mc13_c(uint8_t *dst, uint8_t *src,               \
     OPNAME ## pixels16_l2_8(dst, halfH + 16, halfHV, stride, 16, 16, 16);     \
 }                                                                             \
                                                                               \
-void ff_ ## OPNAME ## qpel16_mc33_old_c(uint8_t *dst, uint8_t *src,           \
+void ff_ ## OPNAME ## qpel16_mc33_old_c(uint8_t *dst, const uint8_t *src,     \
                                         ptrdiff_t stride)                     \
 {                                                                             \
     uint8_t full[24 * 17];                                                    \
@@ -584,7 +586,7 @@ void ff_ ## OPNAME ## qpel16_mc33_old_c(uint8_t *dst, uint8_t *src,           \
                             stride, 24, 16, 16, 16, 16);                      \
 }                                                                             \
                                                                               \
-static void OPNAME ## qpel16_mc33_c(uint8_t *dst, uint8_t *src,               \
+static void OPNAME ## qpel16_mc33_c(uint8_t *dst, const uint8_t *src,         \
                                     ptrdiff_t stride)                         \
 {                                                                             \
     uint8_t full[24 * 17];                                                    \
@@ -598,7 +600,7 @@ static void OPNAME ## qpel16_mc33_c(uint8_t *dst, uint8_t *src,               \
     OPNAME ## pixels16_l2_8(dst, halfH + 16, halfHV, stride, 16, 16, 16);     \
 }                                                                             \
                                                                               \
-static void OPNAME ## qpel16_mc21_c(uint8_t *dst, uint8_t *src,               \
+static void OPNAME ## qpel16_mc21_c(uint8_t *dst, const uint8_t *src,         \
                                     ptrdiff_t stride)                         \
 {                                                                             \
     uint8_t halfH[272];                                                       \
@@ -609,7 +611,7 @@ static void OPNAME ## qpel16_mc21_c(uint8_t *dst, uint8_t *src,               \
     OPNAME ## pixels16_l2_8(dst, halfH, halfHV, stride, 16, 16, 16);          \
 }                                                                             \
                                                                               \
-static void OPNAME ## qpel16_mc23_c(uint8_t *dst, uint8_t *src,               \
+static void OPNAME ## qpel16_mc23_c(uint8_t *dst, const uint8_t *src,         \
                                     ptrdiff_t stride)                         \
 {                                                                             \
     uint8_t halfH[272];                                                       \
@@ -620,7 +622,7 @@ static void OPNAME ## qpel16_mc23_c(uint8_t *dst, uint8_t *src,               \
     OPNAME ## pixels16_l2_8(dst, halfH + 16, halfHV, stride, 16, 16, 16);     \
 }                                                                             \
                                                                               \
-void ff_ ## OPNAME ## qpel16_mc12_old_c(uint8_t *dst, uint8_t *src,           \
+void ff_ ## OPNAME ## qpel16_mc12_old_c(uint8_t *dst, const uint8_t *src,     \
                                         ptrdiff_t stride)                     \
 {                                                                             \
     uint8_t full[24 * 17];                                                    \
@@ -635,7 +637,7 @@ void ff_ ## OPNAME ## qpel16_mc12_old_c(uint8_t *dst, uint8_t *src,           \
     OPNAME ## pixels16_l2_8(dst, halfV, halfHV, stride, 16, 16, 16);          \
 }                                                                             \
                                                                               \
-static void OPNAME ## qpel16_mc12_c(uint8_t *dst, uint8_t *src,               \
+static void OPNAME ## qpel16_mc12_c(uint8_t *dst, const uint8_t *src,         \
                                     ptrdiff_t stride)                         \
 {                                                                             \
     uint8_t full[24 * 17];                                                    \
@@ -647,7 +649,7 @@ static void OPNAME ## qpel16_mc12_c(uint8_t *dst, uint8_t *src,               \
     OPNAME ## mpeg4_qpel16_v_lowpass(dst, halfH, stride, 16);                 \
 }                                                                             \
                                                                               \
-void ff_ ## OPNAME ## qpel16_mc32_old_c(uint8_t *dst, uint8_t *src,           \
+void ff_ ## OPNAME ## qpel16_mc32_old_c(uint8_t *dst, const uint8_t *src,     \
                                         ptrdiff_t stride)                     \
 {                                                                             \
     uint8_t full[24 * 17];                                                    \
@@ -662,7 +664,7 @@ void ff_ ## OPNAME ## qpel16_mc32_old_c(uint8_t *dst, uint8_t *src,           \
     OPNAME ## pixels16_l2_8(dst, halfV, halfHV, stride, 16, 16, 16);          \
 }                                                                             \
                                                                               \
-static void OPNAME ## qpel16_mc32_c(uint8_t *dst, uint8_t *src,               \
+static void OPNAME ## qpel16_mc32_c(uint8_t *dst, const uint8_t *src,         \
                                     ptrdiff_t stride)                         \
 {                                                                             \
     uint8_t full[24 * 17];                                                    \
@@ -674,7 +676,7 @@ static void OPNAME ## qpel16_mc32_c(uint8_t *dst, uint8_t *src,               \
     OPNAME ## mpeg4_qpel16_v_lowpass(dst, halfH, stride, 16);                 \
 }                                                                             \
                                                                               \
-static void OPNAME ## qpel16_mc22_c(uint8_t *dst, uint8_t *src,               \
+static void OPNAME ## qpel16_mc22_c(uint8_t *dst, const uint8_t *src,         \
                                     ptrdiff_t stride)                         \
 {                                                                             \
     uint8_t halfH[272];                                                       \
@@ -695,22 +697,22 @@ QPEL_MC(0, avg_, _, op_avg)
 #undef op_put
 #undef op_put_no_rnd
 
-void ff_put_pixels8x8_c(uint8_t *dst, uint8_t *src, ptrdiff_t stride)
+void ff_put_pixels8x8_c(uint8_t *dst, const uint8_t *src, ptrdiff_t stride)
 {
     put_pixels8_8_c(dst, src, stride, 8);
 }
 
-void ff_avg_pixels8x8_c(uint8_t *dst, uint8_t *src, ptrdiff_t stride)
+void ff_avg_pixels8x8_c(uint8_t *dst, const uint8_t *src, ptrdiff_t stride)
 {
     avg_pixels8_8_c(dst, src, stride, 8);
 }
 
-void ff_put_pixels16x16_c(uint8_t *dst, uint8_t *src, ptrdiff_t stride)
+void ff_put_pixels16x16_c(uint8_t *dst, const uint8_t *src, ptrdiff_t stride)
 {
     put_pixels16_8_c(dst, src, stride, 16);
 }
 
-void ff_avg_pixels16x16_c(uint8_t *dst, uint8_t *src, ptrdiff_t stride)
+void ff_avg_pixels16x16_c(uint8_t *dst, const uint8_t *src, ptrdiff_t stride)
 {
     avg_pixels16_8_c(dst, src, stride, 16);
 }
diff --git a/libavcodec/qpeldsp.h b/libavcodec/qpeldsp.h
index a750ff836f..4ad141d057 100644
--- a/libavcodec/qpeldsp.h
+++ b/libavcodec/qpeldsp.h
@@ -29,22 +29,25 @@
 #include <stddef.h>
 #include <stdint.h>
 
-void ff_put_pixels8x8_c(uint8_t *dst, uint8_t *src, ptrdiff_t stride);
-void ff_avg_pixels8x8_c(uint8_t *dst, uint8_t *src, ptrdiff_t stride);
-void ff_put_pixels16x16_c(uint8_t *dst, uint8_t *src, ptrdiff_t stride);
-void ff_avg_pixels16x16_c(uint8_t *dst, uint8_t *src, ptrdiff_t stride);
+void ff_put_pixels8x8_c(uint8_t *dst, const uint8_t *src, ptrdiff_t stride);
+void ff_avg_pixels8x8_c(uint8_t *dst, const uint8_t *src, ptrdiff_t stride);
+void ff_put_pixels16x16_c(uint8_t *dst, const uint8_t *src, ptrdiff_t stride);
+void ff_avg_pixels16x16_c(uint8_t *dst, const uint8_t *src, ptrdiff_t stride);
 
 void ff_put_pixels8_l2_8(uint8_t *dst, const uint8_t *src1, const uint8_t *src2,
                          int dst_stride, int src_stride1, int src_stride2,
                          int h);
 
-#define DEF_OLD_QPEL(name)                                                     \
-    void ff_put_        ## name(uint8_t *dst /* align width (8 or 16) */,      \
-                                uint8_t *src /* align 1 */, ptrdiff_t stride); \
-    void ff_put_no_rnd_ ## name(uint8_t *dst /* align width (8 or 16) */,      \
-                                uint8_t *src /* align 1 */, ptrdiff_t stride); \
-    void ff_avg_        ## name(uint8_t *dst /* align width (8 or 16) */,      \
-                                uint8_t *src /* align 1 */, ptrdiff_t stride);
+#define DEF_OLD_QPEL(name)                                              \
+void ff_put_        ## name(uint8_t *dst /* align width (8 or 16) */,   \
+                            const uint8_t *src /* align 1 */,           \
+                            ptrdiff_t stride);                          \
+void ff_put_no_rnd_ ## name(uint8_t *dst /* align width (8 or 16) */,   \
+                            const uint8_t *src /* align 1 */,           \
+                            ptrdiff_t stride);                          \
+void ff_avg_        ## name(uint8_t *dst /* align width (8 or 16) */,   \
+                            const uint8_t *src /* align 1 */,           \
+                            ptrdiff_t stride);
 
 DEF_OLD_QPEL(qpel16_mc11_old_c)
 DEF_OLD_QPEL(qpel16_mc31_old_c)
@@ -60,7 +63,8 @@ DEF_OLD_QPEL(qpel8_mc13_old_c)
 DEF_OLD_QPEL(qpel8_mc33_old_c)
 
 typedef void (*qpel_mc_func)(uint8_t *dst /* align width (8 or 16) */,
-                             uint8_t *src /* align 1 */, ptrdiff_t stride);
+                             const uint8_t *src /* align 1 */,
+                             ptrdiff_t stride);
 
 /**
  * quarterpel DSP context
diff --git a/libavcodec/rv30dsp.c b/libavcodec/rv30dsp.c
index 92234ed426..36187a7916 100644
--- a/libavcodec/rv30dsp.c
+++ b/libavcodec/rv30dsp.c
@@ -31,7 +31,7 @@
 #include "rv34dsp.h"
 
 #define RV30_LOWPASS(OPNAME, OP) \
-static av_unused void OPNAME ## rv30_tpel8_h_lowpass(uint8_t *dst, uint8_t *src, int dstStride, int srcStride, const int C1, const int C2){\
+static av_unused void OPNAME ## rv30_tpel8_h_lowpass(uint8_t *dst, const uint8_t *src, int dstStride, int srcStride, const int C1, const int C2){\
     const int h = 8;\
     const uint8_t *cm = ff_crop_tab + MAX_NEG_CROP;\
     int i;\
@@ -50,7 +50,7 @@ static av_unused void OPNAME ## rv30_tpel8_h_lowpass(uint8_t *dst, uint8_t *src,
     }\
 }\
 \
-static void OPNAME ## rv30_tpel8_v_lowpass(uint8_t *dst, uint8_t *src, int dstStride, int srcStride, const int C1, const int C2){\
+static void OPNAME ## rv30_tpel8_v_lowpass(uint8_t *dst, const uint8_t *src, int dstStride, int srcStride, const int C1, const int C2){\
     const int w = 8;\
     const uint8_t *cm = ff_crop_tab + MAX_NEG_CROP;\
     int i;\
@@ -80,7 +80,7 @@ static void OPNAME ## rv30_tpel8_v_lowpass(uint8_t *dst, uint8_t *src, int dstSt
     }\
 }\
 \
-static void OPNAME ## rv30_tpel8_hv_lowpass(uint8_t *dst, uint8_t *src, int dstStride, int srcStride){\
+static void OPNAME ## rv30_tpel8_hv_lowpass(uint8_t *dst, const uint8_t *src, int dstStride, int srcStride){\
     const int w = 8;\
     const int h = 8;\
     const uint8_t *cm = ff_crop_tab + MAX_NEG_CROP;\
@@ -99,7 +99,7 @@ static void OPNAME ## rv30_tpel8_hv_lowpass(uint8_t *dst, uint8_t *src, int dstS
     }\
 }\
 \
-static void OPNAME ## rv30_tpel8_hhv_lowpass(uint8_t *dst, uint8_t *src, int dstStride, int srcStride){\
+static void OPNAME ## rv30_tpel8_hhv_lowpass(uint8_t *dst, const uint8_t *src, int dstStride, int srcStride){\
     const int w = 8;\
     const int h = 8;\
     const uint8_t *cm = ff_crop_tab + MAX_NEG_CROP;\
@@ -118,7 +118,7 @@ static void OPNAME ## rv30_tpel8_hhv_lowpass(uint8_t *dst, uint8_t *src, int dst
     }\
 }\
 \
-static void OPNAME ## rv30_tpel8_hvv_lowpass(uint8_t *dst, uint8_t *src, int dstStride, int srcStride){\
+static void OPNAME ## rv30_tpel8_hvv_lowpass(uint8_t *dst, const uint8_t *src, int dstStride, int srcStride){\
     const int w = 8;\
     const int h = 8;\
     const uint8_t *cm = ff_crop_tab + MAX_NEG_CROP;\
@@ -137,7 +137,7 @@ static void OPNAME ## rv30_tpel8_hvv_lowpass(uint8_t *dst, uint8_t *src, int dst
     }\
 }\
 \
-static void OPNAME ## rv30_tpel8_hhvv_lowpass(uint8_t *dst, uint8_t *src, int dstStride, int srcStride){\
+static void OPNAME ## rv30_tpel8_hhvv_lowpass(uint8_t *dst, const uint8_t *src, int dstStride, int srcStride){\
     const int w = 8;\
     const int h = 8;\
     const uint8_t *cm = ff_crop_tab + MAX_NEG_CROP;\
@@ -155,7 +155,7 @@ static void OPNAME ## rv30_tpel8_hhvv_lowpass(uint8_t *dst, uint8_t *src, int ds
     }\
 }\
 \
-static void OPNAME ## rv30_tpel16_v_lowpass(uint8_t *dst, uint8_t *src, int dstStride, int srcStride, const int C1, const int C2){\
+static void OPNAME ## rv30_tpel16_v_lowpass(uint8_t *dst, const uint8_t *src, int dstStride, int srcStride, const int C1, const int C2){\
     OPNAME ## rv30_tpel8_v_lowpass(dst  , src  , dstStride, srcStride, C1, C2);\
     OPNAME ## rv30_tpel8_v_lowpass(dst+8, src+8, dstStride, srcStride, C1, C2);\
     src += 8*srcStride;\
@@ -164,7 +164,7 @@ static void OPNAME ## rv30_tpel16_v_lowpass(uint8_t *dst, uint8_t *src, int dstS
     OPNAME ## rv30_tpel8_v_lowpass(dst+8, src+8, dstStride, srcStride, C1, C2);\
 }\
 \
-static void OPNAME ## rv30_tpel16_h_lowpass(uint8_t *dst, uint8_t *src, int dstStride, int srcStride, const int C1, const int C2){\
+static void OPNAME ## rv30_tpel16_h_lowpass(uint8_t *dst, const uint8_t *src, int dstStride, int srcStride, const int C1, const int C2){\
     OPNAME ## rv30_tpel8_h_lowpass(dst  , src  , dstStride, srcStride, C1, C2);\
     OPNAME ## rv30_tpel8_h_lowpass(dst+8, src+8, dstStride, srcStride, C1, C2);\
     src += 8*srcStride;\
@@ -173,7 +173,7 @@ static void OPNAME ## rv30_tpel16_h_lowpass(uint8_t *dst, uint8_t *src, int dstS
     OPNAME ## rv30_tpel8_h_lowpass(dst+8, src+8, dstStride, srcStride, C1, C2);\
 }\
 \
-static void OPNAME ## rv30_tpel16_hv_lowpass(uint8_t *dst, uint8_t *src, int dstStride, int srcStride){\
+static void OPNAME ## rv30_tpel16_hv_lowpass(uint8_t *dst, const uint8_t *src, int dstStride, int srcStride){\
     OPNAME ## rv30_tpel8_hv_lowpass(dst  , src  , dstStride, srcStride);\
     OPNAME ## rv30_tpel8_hv_lowpass(dst+8, src+8, dstStride, srcStride);\
     src += 8*srcStride;\
@@ -182,7 +182,7 @@ static void OPNAME ## rv30_tpel16_hv_lowpass(uint8_t *dst, uint8_t *src, int dst
     OPNAME ## rv30_tpel8_hv_lowpass(dst+8, src+8, dstStride, srcStride);\
 }\
 \
-static void OPNAME ## rv30_tpel16_hhv_lowpass(uint8_t *dst, uint8_t *src, int dstStride, int srcStride){\
+static void OPNAME ## rv30_tpel16_hhv_lowpass(uint8_t *dst, const uint8_t *src, int dstStride, int srcStride){\
     OPNAME ## rv30_tpel8_hhv_lowpass(dst  , src  , dstStride, srcStride);\
     OPNAME ## rv30_tpel8_hhv_lowpass(dst+8, src+8, dstStride, srcStride);\
     src += 8*srcStride;\
@@ -191,7 +191,7 @@ static void OPNAME ## rv30_tpel16_hhv_lowpass(uint8_t *dst, uint8_t *src, int ds
     OPNAME ## rv30_tpel8_hhv_lowpass(dst+8, src+8, dstStride, srcStride);\
 }\
 \
-static void OPNAME ## rv30_tpel16_hvv_lowpass(uint8_t *dst, uint8_t *src, int dstStride, int srcStride){\
+static void OPNAME ## rv30_tpel16_hvv_lowpass(uint8_t *dst, const uint8_t *src, int dstStride, int srcStride){\
     OPNAME ## rv30_tpel8_hvv_lowpass(dst  , src  , dstStride, srcStride);\
     OPNAME ## rv30_tpel8_hvv_lowpass(dst+8, src+8, dstStride, srcStride);\
     src += 8*srcStride;\
@@ -200,7 +200,7 @@ static void OPNAME ## rv30_tpel16_hvv_lowpass(uint8_t *dst, uint8_t *src, int ds
     OPNAME ## rv30_tpel8_hvv_lowpass(dst+8, src+8, dstStride, srcStride);\
 }\
 \
-static void OPNAME ## rv30_tpel16_hhvv_lowpass(uint8_t *dst, uint8_t *src, int dstStride, int srcStride){\
+static void OPNAME ## rv30_tpel16_hhvv_lowpass(uint8_t *dst, const uint8_t *src, int dstStride, int srcStride){\
     OPNAME ## rv30_tpel8_hhvv_lowpass(dst  , src  , dstStride, srcStride);\
     OPNAME ## rv30_tpel8_hhvv_lowpass(dst+8, src+8, dstStride, srcStride);\
     src += 8*srcStride;\
@@ -211,42 +211,42 @@ static void OPNAME ## rv30_tpel16_hhvv_lowpass(uint8_t *dst, uint8_t *src, int d
 \
 
 #define RV30_MC(OPNAME, SIZE) \
-static void OPNAME ## rv30_tpel ## SIZE ## _mc10_c(uint8_t *dst, uint8_t *src, ptrdiff_t stride)\
+static void OPNAME ## rv30_tpel ## SIZE ## _mc10_c(uint8_t *dst, const uint8_t *src, ptrdiff_t stride)\
 {\
     OPNAME ## rv30_tpel ## SIZE ## _h_lowpass(dst, src, stride, stride, 12, 6);\
 }\
 \
-static void OPNAME ## rv30_tpel ## SIZE ## _mc20_c(uint8_t *dst, uint8_t *src, ptrdiff_t stride)\
+static void OPNAME ## rv30_tpel ## SIZE ## _mc20_c(uint8_t *dst, const uint8_t *src, ptrdiff_t stride)\
 {\
     OPNAME ## rv30_tpel ## SIZE ## _h_lowpass(dst, src, stride, stride, 6, 12);\
 }\
 \
-static void OPNAME ## rv30_tpel ## SIZE ## _mc01_c(uint8_t *dst, uint8_t *src, ptrdiff_t stride)\
+static void OPNAME ## rv30_tpel ## SIZE ## _mc01_c(uint8_t *dst, const uint8_t *src, ptrdiff_t stride)\
 {\
     OPNAME ## rv30_tpel ## SIZE ## _v_lowpass(dst, src, stride, stride, 12, 6);\
 }\
 \
-static void OPNAME ## rv30_tpel ## SIZE ## _mc02_c(uint8_t *dst, uint8_t *src, ptrdiff_t stride)\
+static void OPNAME ## rv30_tpel ## SIZE ## _mc02_c(uint8_t *dst, const uint8_t *src, ptrdiff_t stride)\
 {\
     OPNAME ## rv30_tpel ## SIZE ## _v_lowpass(dst, src, stride, stride, 6, 12);\
 }\
 \
-static void OPNAME ## rv30_tpel ## SIZE ## _mc11_c(uint8_t *dst, uint8_t *src, ptrdiff_t stride)\
+static void OPNAME ## rv30_tpel ## SIZE ## _mc11_c(uint8_t *dst, const uint8_t *src, ptrdiff_t stride)\
 {\
     OPNAME ## rv30_tpel ## SIZE ## _hv_lowpass(dst, src, stride, stride);\
 }\
 \
-static void OPNAME ## rv30_tpel ## SIZE ## _mc12_c(uint8_t *dst, uint8_t *src, ptrdiff_t stride)\
+static void OPNAME ## rv30_tpel ## SIZE ## _mc12_c(uint8_t *dst, const uint8_t *src, ptrdiff_t stride)\
 {\
     OPNAME ## rv30_tpel ## SIZE ## _hvv_lowpass(dst, src, stride, stride);\
 }\
 \
-static void OPNAME ## rv30_tpel ## SIZE ## _mc21_c(uint8_t *dst, uint8_t *src, ptrdiff_t stride)\
+static void OPNAME ## rv30_tpel ## SIZE ## _mc21_c(uint8_t *dst, const uint8_t *src, ptrdiff_t stride)\
 {\
     OPNAME ## rv30_tpel ## SIZE ## _hhv_lowpass(dst, src, stride, stride);\
 }\
 \
-static void OPNAME ## rv30_tpel ## SIZE ## _mc22_c(uint8_t *dst, uint8_t *src, ptrdiff_t stride)\
+static void OPNAME ## rv30_tpel ## SIZE ## _mc22_c(uint8_t *dst, const uint8_t *src, ptrdiff_t stride)\
 {\
     OPNAME ## rv30_tpel ## SIZE ## _hhvv_lowpass(dst, src, stride, stride);\
 }\
diff --git a/libavcodec/rv40dsp.c b/libavcodec/rv40dsp.c
index cca0294261..d1643e0fca 100644
--- a/libavcodec/rv40dsp.c
+++ b/libavcodec/rv40dsp.c
@@ -34,7 +34,7 @@
 #include "rv34dsp.h"
 
 #define RV40_LOWPASS(OPNAME, OP) \
-static av_unused void OPNAME ## rv40_qpel8_h_lowpass(uint8_t *dst, uint8_t *src, int dstStride, int srcStride,\
+static av_unused void OPNAME ## rv40_qpel8_h_lowpass(uint8_t *dst, const uint8_t *src, int dstStride, int srcStride,\
                                                      const int h, const int C1, const int C2, const int SHIFT){\
     const uint8_t *cm = ff_crop_tab + MAX_NEG_CROP;\
     int i;\
@@ -53,7 +53,7 @@ static av_unused void OPNAME ## rv40_qpel8_h_lowpass(uint8_t *dst, uint8_t *src,
     }\
 }\
 \
-static void OPNAME ## rv40_qpel8_v_lowpass(uint8_t *dst, uint8_t *src, int dstStride, int srcStride,\
+static void OPNAME ## rv40_qpel8_v_lowpass(uint8_t *dst, const uint8_t *src, int dstStride, int srcStride,\
                                            const int w, const int C1, const int C2, const int SHIFT){\
     const uint8_t *cm = ff_crop_tab + MAX_NEG_CROP;\
     int i;\
@@ -85,7 +85,7 @@ static void OPNAME ## rv40_qpel8_v_lowpass(uint8_t *dst, uint8_t *src, int dstSt
     }\
 }\
 \
-static void OPNAME ## rv40_qpel16_v_lowpass(uint8_t *dst, uint8_t *src, int dstStride, int srcStride,\
+static void OPNAME ## rv40_qpel16_v_lowpass(uint8_t *dst, const uint8_t *src, int dstStride, int srcStride,\
                                             const int w, const int C1, const int C2, const int SHIFT){\
     OPNAME ## rv40_qpel8_v_lowpass(dst  , src  , dstStride, srcStride, 8, C1, C2, SHIFT);\
     OPNAME ## rv40_qpel8_v_lowpass(dst+8, src+8, dstStride, srcStride, 8, C1, C2, SHIFT);\
@@ -95,7 +95,7 @@ static void OPNAME ## rv40_qpel16_v_lowpass(uint8_t *dst, uint8_t *src, int dstS
     OPNAME ## rv40_qpel8_v_lowpass(dst+8, src+8, dstStride, srcStride, w-8, C1, C2, SHIFT);\
 }\
 \
-static void OPNAME ## rv40_qpel16_h_lowpass(uint8_t *dst, uint8_t *src, int dstStride, int srcStride,\
+static void OPNAME ## rv40_qpel16_h_lowpass(uint8_t *dst, const uint8_t *src, int dstStride, int srcStride,\
                                             const int h, const int C1, const int C2, const int SHIFT){\
     OPNAME ## rv40_qpel8_h_lowpass(dst  , src  , dstStride, srcStride, 8, C1, C2, SHIFT);\
     OPNAME ## rv40_qpel8_h_lowpass(dst+8, src+8, dstStride, srcStride, 8, C1, C2, SHIFT);\
@@ -107,22 +107,22 @@ static void OPNAME ## rv40_qpel16_h_lowpass(uint8_t *dst, uint8_t *src, int dstS
 \
 
 #define RV40_MC(OPNAME, SIZE) \
-static void OPNAME ## rv40_qpel ## SIZE ## _mc10_c(uint8_t *dst, uint8_t *src, ptrdiff_t stride)\
+static void OPNAME ## rv40_qpel ## SIZE ## _mc10_c(uint8_t *dst, const uint8_t *src, ptrdiff_t stride)\
 {\
     OPNAME ## rv40_qpel ## SIZE ## _h_lowpass(dst, src, stride, stride, SIZE, 52, 20, 6);\
 }\
 \
-static void OPNAME ## rv40_qpel ## SIZE ## _mc30_c(uint8_t *dst, uint8_t *src, ptrdiff_t stride)\
+static void OPNAME ## rv40_qpel ## SIZE ## _mc30_c(uint8_t *dst, const uint8_t *src, ptrdiff_t stride)\
 {\
     OPNAME ## rv40_qpel ## SIZE ## _h_lowpass(dst, src, stride, stride, SIZE, 20, 52, 6);\
 }\
 \
-static void OPNAME ## rv40_qpel ## SIZE ## _mc01_c(uint8_t *dst, uint8_t *src, ptrdiff_t stride)\
+static void OPNAME ## rv40_qpel ## SIZE ## _mc01_c(uint8_t *dst, const uint8_t *src, ptrdiff_t stride)\
 {\
     OPNAME ## rv40_qpel ## SIZE ## _v_lowpass(dst, src, stride, stride, SIZE, 52, 20, 6);\
 }\
 \
-static void OPNAME ## rv40_qpel ## SIZE ## _mc11_c(uint8_t *dst, uint8_t *src, ptrdiff_t stride)\
+static void OPNAME ## rv40_qpel ## SIZE ## _mc11_c(uint8_t *dst, const uint8_t *src, ptrdiff_t stride)\
 {\
     uint8_t full[SIZE*(SIZE+5)];\
     uint8_t * const full_mid = full + SIZE*2;\
@@ -130,7 +130,7 @@ static void OPNAME ## rv40_qpel ## SIZE ## _mc11_c(uint8_t *dst, uint8_t *src, p
     OPNAME ## rv40_qpel ## SIZE ## _v_lowpass(dst, full_mid, stride, SIZE, SIZE, 52, 20, 6);\
 }\
 \
-static void OPNAME ## rv40_qpel ## SIZE ## _mc21_c(uint8_t *dst, uint8_t *src, ptrdiff_t stride)\
+static void OPNAME ## rv40_qpel ## SIZE ## _mc21_c(uint8_t *dst, const uint8_t *src, ptrdiff_t stride)\
 {\
     uint8_t full[SIZE*(SIZE+5)];\
     uint8_t * const full_mid = full + SIZE*2;\
@@ -138,7 +138,7 @@ static void OPNAME ## rv40_qpel ## SIZE ## _mc21_c(uint8_t *dst, uint8_t *src, p
     OPNAME ## rv40_qpel ## SIZE ## _v_lowpass(dst, full_mid, stride, SIZE, SIZE, 52, 20, 6);\
 }\
 \
-static void OPNAME ## rv40_qpel ## SIZE ## _mc31_c(uint8_t *dst, uint8_t *src, ptrdiff_t stride)\
+static void OPNAME ## rv40_qpel ## SIZE ## _mc31_c(uint8_t *dst, const uint8_t *src, ptrdiff_t stride)\
 {\
     uint8_t full[SIZE*(SIZE+5)];\
     uint8_t * const full_mid = full + SIZE*2;\
@@ -146,7 +146,7 @@ static void OPNAME ## rv40_qpel ## SIZE ## _mc31_c(uint8_t *dst, uint8_t *src, p
     OPNAME ## rv40_qpel ## SIZE ## _v_lowpass(dst, full_mid, stride, SIZE, SIZE, 52, 20, 6);\
 }\
 \
-static void OPNAME ## rv40_qpel ## SIZE ## _mc12_c(uint8_t *dst, uint8_t *src, ptrdiff_t stride)\
+static void OPNAME ## rv40_qpel ## SIZE ## _mc12_c(uint8_t *dst, const uint8_t *src, ptrdiff_t stride)\
 {\
     uint8_t full[SIZE*(SIZE+5)];\
     uint8_t * const full_mid = full + SIZE*2;\
@@ -154,7 +154,7 @@ static void OPNAME ## rv40_qpel ## SIZE ## _mc12_c(uint8_t *dst, uint8_t *src, p
     OPNAME ## rv40_qpel ## SIZE ## _v_lowpass(dst, full_mid, stride, SIZE, SIZE, 20, 20, 5);\
 }\
 \
-static void OPNAME ## rv40_qpel ## SIZE ## _mc22_c(uint8_t *dst, uint8_t *src, ptrdiff_t stride)\
+static void OPNAME ## rv40_qpel ## SIZE ## _mc22_c(uint8_t *dst, const uint8_t *src, ptrdiff_t stride)\
 {\
     uint8_t full[SIZE*(SIZE+5)];\
     uint8_t * const full_mid = full + SIZE*2;\
@@ -162,7 +162,7 @@ static void OPNAME ## rv40_qpel ## SIZE ## _mc22_c(uint8_t *dst, uint8_t *src, p
     OPNAME ## rv40_qpel ## SIZE ## _v_lowpass(dst, full_mid, stride, SIZE, SIZE, 20, 20, 5);\
 }\
 \
-static void OPNAME ## rv40_qpel ## SIZE ## _mc32_c(uint8_t *dst, uint8_t *src, ptrdiff_t stride)\
+static void OPNAME ## rv40_qpel ## SIZE ## _mc32_c(uint8_t *dst, const uint8_t *src, ptrdiff_t stride)\
 {\
     uint8_t full[SIZE*(SIZE+5)];\
     uint8_t * const full_mid = full + SIZE*2;\
@@ -170,12 +170,12 @@ static void OPNAME ## rv40_qpel ## SIZE ## _mc32_c(uint8_t *dst, uint8_t *src, p
     OPNAME ## rv40_qpel ## SIZE ## _v_lowpass(dst, full_mid, stride, SIZE, SIZE, 20, 20, 5);\
 }\
 \
-static void OPNAME ## rv40_qpel ## SIZE ## _mc03_c(uint8_t *dst, uint8_t *src, ptrdiff_t stride)\
+static void OPNAME ## rv40_qpel ## SIZE ## _mc03_c(uint8_t *dst, const uint8_t *src, ptrdiff_t stride)\
 {\
     OPNAME ## rv40_qpel ## SIZE ## _v_lowpass(dst, src, stride, stride, SIZE, 20, 52, 6);\
 }\
 \
-static void OPNAME ## rv40_qpel ## SIZE ## _mc13_c(uint8_t *dst, uint8_t *src, ptrdiff_t stride)\
+static void OPNAME ## rv40_qpel ## SIZE ## _mc13_c(uint8_t *dst, const uint8_t *src, ptrdiff_t stride)\
 {\
     uint8_t full[SIZE*(SIZE+5)];\
     uint8_t * const full_mid = full + SIZE*2;\
@@ -183,7 +183,7 @@ static void OPNAME ## rv40_qpel ## SIZE ## _mc13_c(uint8_t *dst, uint8_t *src, p
     OPNAME ## rv40_qpel ## SIZE ## _v_lowpass(dst, full_mid, stride, SIZE, SIZE, 20, 52, 6);\
 }\
 \
-static void OPNAME ## rv40_qpel ## SIZE ## _mc23_c(uint8_t *dst, uint8_t *src, ptrdiff_t stride)\
+static void OPNAME ## rv40_qpel ## SIZE ## _mc23_c(uint8_t *dst, const uint8_t *src, ptrdiff_t stride)\
 {\
     uint8_t full[SIZE*(SIZE+5)];\
     uint8_t * const full_mid = full + SIZE*2;\
@@ -266,19 +266,19 @@ PIXOP2(put, op_put)
 #undef op_avg
 #undef op_put
 
-static void put_rv40_qpel16_mc33_c(uint8_t *dst, uint8_t *src, ptrdiff_t stride)
+static void put_rv40_qpel16_mc33_c(uint8_t *dst, const uint8_t *src, ptrdiff_t stride)
 {
     put_pixels16_xy2_8_c(dst, src, stride, 16);
 }
-static void avg_rv40_qpel16_mc33_c(uint8_t *dst, uint8_t *src, ptrdiff_t stride)
+static void avg_rv40_qpel16_mc33_c(uint8_t *dst, const uint8_t *src, ptrdiff_t stride)
 {
     avg_pixels16_xy2_8_c(dst, src, stride, 16);
 }
-static void put_rv40_qpel8_mc33_c(uint8_t *dst, uint8_t *src, ptrdiff_t stride)
+static void put_rv40_qpel8_mc33_c(uint8_t *dst, const uint8_t *src, ptrdiff_t stride)
 {
     put_pixels8_xy2_8_c(dst, src, stride, 8);
 }
-static void avg_rv40_qpel8_mc33_c(uint8_t *dst, uint8_t *src, ptrdiff_t stride)
+static void avg_rv40_qpel8_mc33_c(uint8_t *dst, const uint8_t *src, ptrdiff_t stride)
 {
     avg_pixels8_xy2_8_c(dst, src, stride, 8);
 }
diff --git a/libavcodec/wmv2dsp.c b/libavcodec/wmv2dsp.c
index 8af71f464d..2e3a3ff552 100644
--- a/libavcodec/wmv2dsp.c
+++ b/libavcodec/wmv2dsp.c
@@ -139,7 +139,7 @@ static void wmv2_idct_put_c(uint8_t *dest, int line_size, int16_t *block)
     }
 }
 
-static void wmv2_mspel8_h_lowpass(uint8_t *dst, uint8_t *src,
+static void wmv2_mspel8_h_lowpass(uint8_t *dst, const uint8_t *src,
                                   int dstStride, int srcStride, int h)
 {
     const uint8_t *cm = ff_crop_tab + MAX_NEG_CROP;
@@ -159,7 +159,7 @@ static void wmv2_mspel8_h_lowpass(uint8_t *dst, uint8_t *src,
     }
 }
 
-static void wmv2_mspel8_v_lowpass(uint8_t *dst, uint8_t *src,
+static void wmv2_mspel8_v_lowpass(uint8_t *dst, const uint8_t *src,
                                   int dstStride, int srcStride, int w)
 {
     const uint8_t *cm = ff_crop_tab + MAX_NEG_CROP;
@@ -190,7 +190,7 @@ static void wmv2_mspel8_v_lowpass(uint8_t *dst, uint8_t *src,
     }
 }
 
-static void put_mspel8_mc10_c(uint8_t *dst, uint8_t *src, ptrdiff_t stride)
+static void put_mspel8_mc10_c(uint8_t *dst, const uint8_t *src, ptrdiff_t stride)
 {
     uint8_t half[64];
 
@@ -198,12 +198,12 @@ static void put_mspel8_mc10_c(uint8_t *dst, uint8_t *src, ptrdiff_t stride)
     ff_put_pixels8_l2_8(dst, src, half, stride, stride, 8, 8);
 }
 
-static void put_mspel8_mc20_c(uint8_t *dst, uint8_t *src, ptrdiff_t stride)
+static void put_mspel8_mc20_c(uint8_t *dst, const uint8_t *src, ptrdiff_t stride)
 {
     wmv2_mspel8_h_lowpass(dst, src, stride, stride, 8);
 }
 
-static void put_mspel8_mc30_c(uint8_t *dst, uint8_t *src, ptrdiff_t stride)
+static void put_mspel8_mc30_c(uint8_t *dst, const uint8_t *src, ptrdiff_t stride)
 {
     uint8_t half[64];
 
@@ -211,12 +211,12 @@ static void put_mspel8_mc30_c(uint8_t *dst, uint8_t *src, ptrdiff_t stride)
     ff_put_pixels8_l2_8(dst, src + 1, half, stride, stride, 8, 8);
 }
 
-static void put_mspel8_mc02_c(uint8_t *dst, uint8_t *src, ptrdiff_t stride)
+static void put_mspel8_mc02_c(uint8_t *dst, const uint8_t *src, ptrdiff_t stride)
 {
     wmv2_mspel8_v_lowpass(dst, src, stride, stride, 8);
 }
 
-static void put_mspel8_mc12_c(uint8_t *dst, uint8_t *src, ptrdiff_t stride)
+static void put_mspel8_mc12_c(uint8_t *dst, const uint8_t *src, ptrdiff_t stride)
 {
     uint8_t halfH[88];
     uint8_t halfV[64];
@@ -228,7 +228,7 @@ static void put_mspel8_mc12_c(uint8_t *dst, uint8_t *src, ptrdiff_t stride)
     ff_put_pixels8_l2_8(dst, halfV, halfHV, stride, 8, 8, 8);
 }
 
-static void put_mspel8_mc32_c(uint8_t *dst, uint8_t *src, ptrdiff_t stride)
+static void put_mspel8_mc32_c(uint8_t *dst, const uint8_t *src, ptrdiff_t stride)
 {
     uint8_t halfH[88];
     uint8_t halfV[64];
@@ -240,7 +240,7 @@ static void put_mspel8_mc32_c(uint8_t *dst, uint8_t *src, ptrdiff_t stride)
     ff_put_pixels8_l2_8(dst, halfV, halfHV, stride, 8, 8, 8);
 }
 
-static void put_mspel8_mc22_c(uint8_t *dst, uint8_t *src, ptrdiff_t stride)
+static void put_mspel8_mc22_c(uint8_t *dst, const uint8_t *src, ptrdiff_t stride)
 {
     uint8_t halfH[88];
 
diff --git a/libavcodec/x86/cavsdsp.c b/libavcodec/x86/cavsdsp.c
index b85912b084..b323a105f2 100644
--- a/libavcodec/x86/cavsdsp.c
+++ b/libavcodec/x86/cavsdsp.c
@@ -334,7 +334,7 @@ static void cavs_idct8_add_mmx(uint8_t *dst, int16_t *block, int stride)
    }
 
 #define QPEL_CAVS(OPNAME, OP, MMX)\
-static void OPNAME ## cavs_qpel8_h_ ## MMX(uint8_t *dst, uint8_t *src, int dstStride, int srcStride){\
+static void OPNAME ## cavs_qpel8_h_ ## MMX(uint8_t *dst, const uint8_t *src, int dstStride, int srcStride){\
     int h=8;\
     __asm__ volatile(\
         "pxor %%mm7, %%mm7          \n\t"\
@@ -381,43 +381,43 @@ static void OPNAME ## cavs_qpel8_h_ ## MMX(uint8_t *dst, uint8_t *src, int dstSt
     );\
 }\
 \
-static inline void OPNAME ## cavs_qpel8or16_v1_ ## MMX(uint8_t *dst, uint8_t *src, int dstStride, int srcStride, int h){\
+static inline void OPNAME ## cavs_qpel8or16_v1_ ## MMX(uint8_t *dst, const uint8_t *src, int dstStride, int srcStride, int h){\
   QPEL_CAVSVNUM(QPEL_CAVSV1,OP,ff_pw_64,ff_pw_96,ff_pw_42)      \
 }\
 \
-static inline void OPNAME ## cavs_qpel8or16_v2_ ## MMX(uint8_t *dst, uint8_t *src, int dstStride, int srcStride, int h){\
+static inline void OPNAME ## cavs_qpel8or16_v2_ ## MMX(uint8_t *dst, const uint8_t *src, int dstStride, int srcStride, int h){\
   QPEL_CAVSVNUM(QPEL_CAVSV2,OP,ff_pw_4,ff_pw_5,ff_pw_5)         \
 }\
 \
-static inline void OPNAME ## cavs_qpel8or16_v3_ ## MMX(uint8_t *dst, uint8_t *src, int dstStride, int srcStride, int h){\
+static inline void OPNAME ## cavs_qpel8or16_v3_ ## MMX(uint8_t *dst, const uint8_t *src, int dstStride, int srcStride, int h){\
   QPEL_CAVSVNUM(QPEL_CAVSV3,OP,ff_pw_64,ff_pw_96,ff_pw_42)      \
 }\
 \
-static void OPNAME ## cavs_qpel8_v1_ ## MMX(uint8_t *dst, uint8_t *src, int dstStride, int srcStride){\
+static void OPNAME ## cavs_qpel8_v1_ ## MMX(uint8_t *dst, const uint8_t *src, int dstStride, int srcStride){\
     OPNAME ## cavs_qpel8or16_v1_ ## MMX(dst  , src  , dstStride, srcStride, 8);\
 }\
-static void OPNAME ## cavs_qpel16_v1_ ## MMX(uint8_t *dst, uint8_t *src, int dstStride, int srcStride){\
+static void OPNAME ## cavs_qpel16_v1_ ## MMX(uint8_t *dst, const uint8_t *src, int dstStride, int srcStride){\
     OPNAME ## cavs_qpel8or16_v1_ ## MMX(dst  , src  , dstStride, srcStride, 16);\
     OPNAME ## cavs_qpel8or16_v1_ ## MMX(dst+8, src+8, dstStride, srcStride, 16);\
 }\
 \
-static void OPNAME ## cavs_qpel8_v2_ ## MMX(uint8_t *dst, uint8_t *src, int dstStride, int srcStride){\
+static void OPNAME ## cavs_qpel8_v2_ ## MMX(uint8_t *dst, const uint8_t *src, int dstStride, int srcStride){\
     OPNAME ## cavs_qpel8or16_v2_ ## MMX(dst  , src  , dstStride, srcStride, 8);\
 }\
-static void OPNAME ## cavs_qpel16_v2_ ## MMX(uint8_t *dst, uint8_t *src, int dstStride, int srcStride){\
+static void OPNAME ## cavs_qpel16_v2_ ## MMX(uint8_t *dst, const uint8_t *src, int dstStride, int srcStride){\
     OPNAME ## cavs_qpel8or16_v2_ ## MMX(dst  , src  , dstStride, srcStride, 16);\
     OPNAME ## cavs_qpel8or16_v2_ ## MMX(dst+8, src+8, dstStride, srcStride, 16);\
 }\
 \
-static void OPNAME ## cavs_qpel8_v3_ ## MMX(uint8_t *dst, uint8_t *src, int dstStride, int srcStride){\
+static void OPNAME ## cavs_qpel8_v3_ ## MMX(uint8_t *dst, const uint8_t *src, int dstStride, int srcStride){\
     OPNAME ## cavs_qpel8or16_v3_ ## MMX(dst  , src  , dstStride, srcStride, 8);\
 }\
-static void OPNAME ## cavs_qpel16_v3_ ## MMX(uint8_t *dst, uint8_t *src, int dstStride, int srcStride){\
+static void OPNAME ## cavs_qpel16_v3_ ## MMX(uint8_t *dst, const uint8_t *src, int dstStride, int srcStride){\
     OPNAME ## cavs_qpel8or16_v3_ ## MMX(dst  , src  , dstStride, srcStride, 16);\
     OPNAME ## cavs_qpel8or16_v3_ ## MMX(dst+8, src+8, dstStride, srcStride, 16);\
 }\
 \
-static void OPNAME ## cavs_qpel16_h_ ## MMX(uint8_t *dst, uint8_t *src, int dstStride, int srcStride){\
+static void OPNAME ## cavs_qpel16_h_ ## MMX(uint8_t *dst, const uint8_t *src, int dstStride, int srcStride){\
     OPNAME ## cavs_qpel8_h_ ## MMX(dst  , src  , dstStride, srcStride);\
     OPNAME ## cavs_qpel8_h_ ## MMX(dst+8, src+8, dstStride, srcStride);\
     src += 8*srcStride;\
@@ -427,22 +427,22 @@ static void OPNAME ## cavs_qpel16_h_ ## MMX(uint8_t *dst, uint8_t *src, int dstS
 }\
 
 #define CAVS_MC(OPNAME, SIZE, MMX) \
-static void OPNAME ## cavs_qpel ## SIZE ## _mc20_ ## MMX(uint8_t *dst, uint8_t *src, ptrdiff_t stride)\
+static void OPNAME ## cavs_qpel ## SIZE ## _mc20_ ## MMX(uint8_t *dst, const uint8_t *src, ptrdiff_t stride)\
 {\
     OPNAME ## cavs_qpel ## SIZE ## _h_ ## MMX(dst, src, stride, stride);\
 }\
 \
-static void OPNAME ## cavs_qpel ## SIZE ## _mc01_ ## MMX(uint8_t *dst, uint8_t *src, ptrdiff_t stride)\
+static void OPNAME ## cavs_qpel ## SIZE ## _mc01_ ## MMX(uint8_t *dst, const uint8_t *src, ptrdiff_t stride)\
 {\
     OPNAME ## cavs_qpel ## SIZE ## _v1_ ## MMX(dst, src, stride, stride);\
 }\
 \
-static void OPNAME ## cavs_qpel ## SIZE ## _mc02_ ## MMX(uint8_t *dst, uint8_t *src, ptrdiff_t stride)\
+static void OPNAME ## cavs_qpel ## SIZE ## _mc02_ ## MMX(uint8_t *dst, const uint8_t *src, ptrdiff_t stride)\
 {\
     OPNAME ## cavs_qpel ## SIZE ## _v2_ ## MMX(dst, src, stride, stride);\
 }\
 \
-static void OPNAME ## cavs_qpel ## SIZE ## _mc03_ ## MMX(uint8_t *dst, uint8_t *src, ptrdiff_t stride)\
+static void OPNAME ## cavs_qpel ## SIZE ## _mc03_ ## MMX(uint8_t *dst, const uint8_t *src, ptrdiff_t stride)\
 {\
     OPNAME ## cavs_qpel ## SIZE ## _v3_ ## MMX(dst, src, stride, stride);\
 }\
@@ -460,25 +460,25 @@ static void OPNAME ## cavs_qpel ## SIZE ## _mc03_ ## MMX(uint8_t *dst, uint8_t *
 #endif /* (HAVE_MMXEXT_INLINE || HAVE_AMD3DNOW_INLINE) */
 
 #if HAVE_MMX_INLINE
-static void put_cavs_qpel8_mc00_mmx(uint8_t *dst, uint8_t *src,
+static void put_cavs_qpel8_mc00_mmx(uint8_t *dst, const uint8_t *src,
                                     ptrdiff_t stride)
 {
     ff_put_pixels8_mmx(dst, src, stride, 8);
 }
 
-static void avg_cavs_qpel8_mc00_mmx(uint8_t *dst, uint8_t *src,
+static void avg_cavs_qpel8_mc00_mmx(uint8_t *dst, const uint8_t *src,
                                     ptrdiff_t stride)
 {
     ff_avg_pixels8_mmx(dst, src, stride, 8);
 }
 
-static void put_cavs_qpel16_mc00_mmx(uint8_t *dst, uint8_t *src,
+static void put_cavs_qpel16_mc00_mmx(uint8_t *dst, const uint8_t *src,
                                      ptrdiff_t stride)
 {
     ff_put_pixels16_mmx(dst, src, stride, 16);
 }
 
-static void avg_cavs_qpel16_mc00_mmx(uint8_t *dst, uint8_t *src,
+static void avg_cavs_qpel16_mc00_mmx(uint8_t *dst, const uint8_t *src,
                                      ptrdiff_t stride)
 {
     ff_avg_pixels16_mmx(dst, src, stride, 16);
diff --git a/libavcodec/x86/h264_qpel.c b/libavcodec/x86/h264_qpel.c
index 8793b5dbd2..9ca6d7e644 100644
--- a/libavcodec/x86/h264_qpel.c
+++ b/libavcodec/x86/h264_qpel.c
@@ -33,17 +33,17 @@ void ff_put_pixels4_mmxext(uint8_t *block, const uint8_t *pixels,
                            ptrdiff_t line_size, int h);
 void ff_avg_pixels4_mmxext(uint8_t *block, const uint8_t *pixels,
                            ptrdiff_t line_size, int h);
-void ff_put_pixels4_l2_mmxext(uint8_t *dst, uint8_t *src1, uint8_t *src2,
+void ff_put_pixels4_l2_mmxext(uint8_t *dst, const uint8_t *src1, const uint8_t *src2,
                               int dstStride, int src1Stride, int h);
-void ff_avg_pixels4_l2_mmxext(uint8_t *dst, uint8_t *src1, uint8_t *src2,
+void ff_avg_pixels4_l2_mmxext(uint8_t *dst, const uint8_t *src1, const uint8_t *src2,
                               int dstStride, int src1Stride, int h);
-void ff_put_pixels8_l2_mmxext(uint8_t *dst, uint8_t *src1, uint8_t *src2,
+void ff_put_pixels8_l2_mmxext(uint8_t *dst, const uint8_t *src1, const uint8_t *src2,
                               int dstStride, int src1Stride, int h);
-void ff_avg_pixels8_l2_mmxext(uint8_t *dst, uint8_t *src1, uint8_t *src2,
+void ff_avg_pixels8_l2_mmxext(uint8_t *dst, const uint8_t *src1, const uint8_t *src2,
                               int dstStride, int src1Stride, int h);
-void ff_put_pixels16_l2_mmxext(uint8_t *dst, uint8_t *src1, uint8_t *src2,
+void ff_put_pixels16_l2_mmxext(uint8_t *dst, const uint8_t *src1, const uint8_t *src2,
                                int dstStride, int src1Stride, int h);
-void ff_avg_pixels16_l2_mmxext(uint8_t *dst, uint8_t *src1, uint8_t *src2,
+void ff_avg_pixels16_l2_mmxext(uint8_t *dst, const uint8_t *src1, const uint8_t *src2,
                                int dstStride, int src1Stride, int h);
 #define ff_put_pixels8_l2_sse2  ff_put_pixels8_l2_mmxext
 #define ff_avg_pixels8_l2_sse2  ff_avg_pixels8_l2_mmxext
@@ -54,29 +54,29 @@ CALL_2X_PIXELS(ff_avg_pixels16_mmxext, ff_avg_pixels8_mmxext, 8)
 CALL_2X_PIXELS(ff_put_pixels16_mmxext, ff_put_pixels8_mmxext, 8)
 
 #define DEF_QPEL(OPNAME)\
-void ff_ ## OPNAME ## _h264_qpel4_h_lowpass_mmxext(uint8_t *dst, uint8_t *src, int dstStride, int srcStride);\
-void ff_ ## OPNAME ## _h264_qpel8_h_lowpass_mmxext(uint8_t *dst, uint8_t *src, int dstStride, int srcStride);\
-void ff_ ## OPNAME ## _h264_qpel8_h_lowpass_ssse3(uint8_t *dst, uint8_t *src, int dstStride, int srcStride);\
-void ff_ ## OPNAME ## _h264_qpel4_h_lowpass_l2_mmxext(uint8_t *dst, uint8_t *src, uint8_t *src2, int dstStride, int src2Stride);\
-void ff_ ## OPNAME ## _h264_qpel8_h_lowpass_l2_mmxext(uint8_t *dst, uint8_t *src, uint8_t *src2, int dstStride, int src2Stride);\
-void ff_ ## OPNAME ## _h264_qpel8_h_lowpass_l2_ssse3(uint8_t *dst, uint8_t *src, uint8_t *src2, int dstStride, int src2Stride);\
-void ff_ ## OPNAME ## _h264_qpel4_v_lowpass_mmxext(uint8_t *dst, uint8_t *src, int dstStride, int srcStride);\
-void ff_ ## OPNAME ## _h264_qpel8or16_v_lowpass_op_mmxext(uint8_t *dst, uint8_t *src, int dstStride, int srcStride, int h);\
-void ff_ ## OPNAME ## _h264_qpel8or16_v_lowpass_sse2(uint8_t *dst, uint8_t *src, int dstStride, int srcStride, int h);\
-void ff_ ## OPNAME ## _h264_qpel4_hv_lowpass_v_mmxext(uint8_t *src, int16_t *tmp, int srcStride);\
+void ff_ ## OPNAME ## _h264_qpel4_h_lowpass_mmxext(uint8_t *dst, const uint8_t *src, int dstStride, int srcStride);\
+void ff_ ## OPNAME ## _h264_qpel8_h_lowpass_mmxext(uint8_t *dst, const uint8_t *src, int dstStride, int srcStride);\
+void ff_ ## OPNAME ## _h264_qpel8_h_lowpass_ssse3(uint8_t *dst, const uint8_t *src, int dstStride, int srcStride);\
+void ff_ ## OPNAME ## _h264_qpel4_h_lowpass_l2_mmxext(uint8_t *dst, const uint8_t *src, const uint8_t *src2, int dstStride, int src2Stride);\
+void ff_ ## OPNAME ## _h264_qpel8_h_lowpass_l2_mmxext(uint8_t *dst, const uint8_t *src, const uint8_t *src2, int dstStride, int src2Stride);\
+void ff_ ## OPNAME ## _h264_qpel8_h_lowpass_l2_ssse3(uint8_t *dst, const uint8_t *src, const uint8_t *src2, int dstStride, int src2Stride);\
+void ff_ ## OPNAME ## _h264_qpel4_v_lowpass_mmxext(uint8_t *dst, const uint8_t *src, int dstStride, int srcStride);\
+void ff_ ## OPNAME ## _h264_qpel8or16_v_lowpass_op_mmxext(uint8_t *dst, const uint8_t *src, int dstStride, int srcStride, int h);\
+void ff_ ## OPNAME ## _h264_qpel8or16_v_lowpass_sse2(uint8_t *dst, const uint8_t *src, int dstStride, int srcStride, int h);\
+void ff_ ## OPNAME ## _h264_qpel4_hv_lowpass_v_mmxext(const uint8_t *src, int16_t *tmp, int srcStride);\
 void ff_ ## OPNAME ## _h264_qpel4_hv_lowpass_h_mmxext(int16_t *tmp, uint8_t *dst, int dstStride);\
-void ff_ ## OPNAME ## _h264_qpel8or16_hv1_lowpass_op_mmxext(uint8_t *src, int16_t *tmp, int srcStride, int size);\
-void ff_ ## OPNAME ## _h264_qpel8or16_hv1_lowpass_op_sse2(uint8_t *src, int16_t *tmp, int srcStride, int size);\
+void ff_ ## OPNAME ## _h264_qpel8or16_hv1_lowpass_op_mmxext(const uint8_t *src, int16_t *tmp, int srcStride, int size);\
+void ff_ ## OPNAME ## _h264_qpel8or16_hv1_lowpass_op_sse2(const uint8_t *src, int16_t *tmp, int srcStride, int size);\
 void ff_ ## OPNAME ## _h264_qpel8or16_hv2_lowpass_op_mmxext(uint8_t *dst, int16_t *tmp, int dstStride, int unused, int h);\
 void ff_ ## OPNAME ## _h264_qpel8or16_hv2_lowpass_ssse3(uint8_t *dst, int16_t *tmp, int dstStride, int tmpStride, int size);\
-void ff_ ## OPNAME ## _pixels4_l2_shift5_mmxext(uint8_t *dst, int16_t *src16, uint8_t *src8, int dstStride, int src8Stride, int h);\
-void ff_ ## OPNAME ## _pixels8_l2_shift5_mmxext(uint8_t *dst, int16_t *src16, uint8_t *src8, int dstStride, int src8Stride, int h);
+void ff_ ## OPNAME ## _pixels4_l2_shift5_mmxext(uint8_t *dst, const int16_t *src16, const uint8_t *src8, int dstStride, int src8Stride, int h);\
+void ff_ ## OPNAME ## _pixels8_l2_shift5_mmxext(uint8_t *dst, const int16_t *src16, const uint8_t *src8, int dstStride, int src8Stride, int h);
 
 DEF_QPEL(avg)
 DEF_QPEL(put)
 
 #define QPEL_H264(OPNAME, OP, MMX)\
-static av_always_inline void ff_ ## OPNAME ## h264_qpel4_hv_lowpass_ ## MMX(uint8_t *dst, int16_t *tmp, uint8_t *src, int dstStride, int tmpStride, int srcStride){\
+static av_always_inline void ff_ ## OPNAME ## h264_qpel4_hv_lowpass_ ## MMX(uint8_t *dst, int16_t *tmp, const uint8_t *src, int dstStride, int tmpStride, int srcStride){\
     int w=3;\
     src -= 2*srcStride+2;\
     while(w--){\
@@ -88,14 +88,14 @@ static av_always_inline void ff_ ## OPNAME ## h264_qpel4_hv_lowpass_ ## MMX(uint
     ff_ ## OPNAME ## h264_qpel4_hv_lowpass_h_mmxext(tmp, dst, dstStride);\
 }\
 \
-static av_always_inline void ff_ ## OPNAME ## h264_qpel8or16_v_lowpass_ ## MMX(uint8_t *dst, uint8_t *src, int dstStride, int srcStride, int h){\
+static av_always_inline void ff_ ## OPNAME ## h264_qpel8or16_v_lowpass_ ## MMX(uint8_t *dst, const uint8_t *src, int dstStride, int srcStride, int h){\
     src -= 2*srcStride;\
     ff_ ## OPNAME ## h264_qpel8or16_v_lowpass_op_mmxext(dst, src, dstStride, srcStride, h);\
     src += 4;\
     dst += 4;\
     ff_ ## OPNAME ## h264_qpel8or16_v_lowpass_op_mmxext(dst, src, dstStride, srcStride, h);\
 }\
-static av_always_inline void ff_ ## OPNAME ## h264_qpel8or16_hv1_lowpass_ ## MMX(int16_t *tmp, uint8_t *src, int tmpStride, int srcStride, int size){\
+static av_always_inline void ff_ ## OPNAME ## h264_qpel8or16_hv1_lowpass_ ## MMX(int16_t *tmp, const uint8_t *src, int tmpStride, int srcStride, int size){\
     int w = (size+8)>>2;\
     src -= 2*srcStride+2;\
     while(w--){\
@@ -113,15 +113,15 @@ static av_always_inline void ff_ ## OPNAME ## h264_qpel8or16_hv2_lowpass_ ## MMX
     }while(w--);\
 }\
 \
-static av_always_inline void ff_ ## OPNAME ## h264_qpel8_v_lowpass_ ## MMX(uint8_t *dst, uint8_t *src, int dstStride, int srcStride){\
+static av_always_inline void ff_ ## OPNAME ## h264_qpel8_v_lowpass_ ## MMX(uint8_t *dst, const uint8_t *src, int dstStride, int srcStride){\
     ff_ ## OPNAME ## h264_qpel8or16_v_lowpass_ ## MMX(dst  , src  , dstStride, srcStride, 8);\
 }\
-static av_always_inline void ff_ ## OPNAME ## h264_qpel16_v_lowpass_ ## MMX(uint8_t *dst, uint8_t *src, int dstStride, int srcStride){\
+static av_always_inline void ff_ ## OPNAME ## h264_qpel16_v_lowpass_ ## MMX(uint8_t *dst, const uint8_t *src, int dstStride, int srcStride){\
     ff_ ## OPNAME ## h264_qpel8or16_v_lowpass_ ## MMX(dst  , src  , dstStride, srcStride, 16);\
     ff_ ## OPNAME ## h264_qpel8or16_v_lowpass_ ## MMX(dst+8, src+8, dstStride, srcStride, 16);\
 }\
 \
-static av_always_inline void ff_ ## OPNAME ## h264_qpel16_h_lowpass_ ## MMX(uint8_t *dst, uint8_t *src, int dstStride, int srcStride){\
+static av_always_inline void ff_ ## OPNAME ## h264_qpel16_h_lowpass_ ## MMX(uint8_t *dst, const uint8_t *src, int dstStride, int srcStride){\
     ff_ ## OPNAME ## h264_qpel8_h_lowpass_ ## MMX(dst  , src  , dstStride, srcStride);\
     ff_ ## OPNAME ## h264_qpel8_h_lowpass_ ## MMX(dst+8, src+8, dstStride, srcStride);\
     src += 8*srcStride;\
@@ -130,7 +130,7 @@ static av_always_inline void ff_ ## OPNAME ## h264_qpel16_h_lowpass_ ## MMX(uint
     ff_ ## OPNAME ## h264_qpel8_h_lowpass_ ## MMX(dst+8, src+8, dstStride, srcStride);\
 }\
 \
-static av_always_inline void ff_ ## OPNAME ## h264_qpel16_h_lowpass_l2_ ## MMX(uint8_t *dst, uint8_t *src, uint8_t *src2, int dstStride, int src2Stride){\
+static av_always_inline void ff_ ## OPNAME ## h264_qpel16_h_lowpass_l2_ ## MMX(uint8_t *dst, const uint8_t *src, const uint8_t *src2, int dstStride, int src2Stride){\
     ff_ ## OPNAME ## h264_qpel8_h_lowpass_l2_ ## MMX(dst  , src  , src2  , dstStride, src2Stride);\
     ff_ ## OPNAME ## h264_qpel8_h_lowpass_l2_ ## MMX(dst+8, src+8, src2+8, dstStride, src2Stride);\
     src += 8*dstStride;\
@@ -140,19 +140,19 @@ static av_always_inline void ff_ ## OPNAME ## h264_qpel16_h_lowpass_l2_ ## MMX(u
     ff_ ## OPNAME ## h264_qpel8_h_lowpass_l2_ ## MMX(dst+8, src+8, src2+8, dstStride, src2Stride);\
 }\
 \
-static av_always_inline void ff_ ## OPNAME ## h264_qpel8or16_hv_lowpass_ ## MMX(uint8_t *dst, int16_t *tmp, uint8_t *src, int dstStride, int tmpStride, int srcStride, int size){\
+static av_always_inline void ff_ ## OPNAME ## h264_qpel8or16_hv_lowpass_ ## MMX(uint8_t *dst, int16_t *tmp, const uint8_t *src, int dstStride, int tmpStride, int srcStride, int size){\
     ff_put_h264_qpel8or16_hv1_lowpass_ ## MMX(tmp, src, tmpStride, srcStride, size);\
     ff_ ## OPNAME ## h264_qpel8or16_hv2_lowpass_ ## MMX(dst, tmp, dstStride, tmpStride, size);\
 }\
-static av_always_inline void ff_ ## OPNAME ## h264_qpel8_hv_lowpass_ ## MMX(uint8_t *dst, int16_t *tmp, uint8_t *src, int dstStride, int tmpStride, int srcStride){\
+static av_always_inline void ff_ ## OPNAME ## h264_qpel8_hv_lowpass_ ## MMX(uint8_t *dst, int16_t *tmp, const uint8_t *src, int dstStride, int tmpStride, int srcStride){\
     ff_ ## OPNAME ## h264_qpel8or16_hv_lowpass_ ## MMX(dst  , tmp  , src  , dstStride, tmpStride, srcStride, 8);\
 }\
 \
-static av_always_inline void ff_ ## OPNAME ## h264_qpel16_hv_lowpass_ ## MMX(uint8_t *dst, int16_t *tmp, uint8_t *src, int dstStride, int tmpStride, int srcStride){\
+static av_always_inline void ff_ ## OPNAME ## h264_qpel16_hv_lowpass_ ## MMX(uint8_t *dst, int16_t *tmp, const uint8_t *src, int dstStride, int tmpStride, int srcStride){\
     ff_ ## OPNAME ## h264_qpel8or16_hv_lowpass_ ## MMX(dst  , tmp  , src  , dstStride, tmpStride, srcStride, 16);\
 }\
 \
-static av_always_inline void ff_ ## OPNAME ## pixels16_l2_shift5_ ## MMX(uint8_t *dst, int16_t *src16, uint8_t *src8, int dstStride, int src8Stride, int h)\
+static av_always_inline void ff_ ## OPNAME ## pixels16_l2_shift5_ ## MMX(uint8_t *dst, const int16_t *src16, const uint8_t *src8, int dstStride, int src8Stride, int h)\
 {\
     ff_ ## OPNAME ## pixels8_l2_shift5_ ## MMX(dst  , src16  , src8  , dstStride, src8Stride, h);\
     ff_ ## OPNAME ## pixels8_l2_shift5_ ## MMX(dst+8, src16+8, src8+8, dstStride, src8Stride, h);\
@@ -162,12 +162,12 @@ static av_always_inline void ff_ ## OPNAME ## pixels16_l2_shift5_ ## MMX(uint8_t
 #if ARCH_X86_64
 #define QPEL_H264_H16_XMM(OPNAME, OP, MMX)\
 
-void ff_avg_h264_qpel16_h_lowpass_l2_ssse3(uint8_t *dst, uint8_t *src, uint8_t *src2, int dstStride, int src2Stride);
-void ff_put_h264_qpel16_h_lowpass_l2_ssse3(uint8_t *dst, uint8_t *src, uint8_t *src2, int dstStride, int src2Stride);
+void ff_avg_h264_qpel16_h_lowpass_l2_ssse3(uint8_t *dst, const uint8_t *src, const uint8_t *src2, int dstStride, int src2Stride);
+void ff_put_h264_qpel16_h_lowpass_l2_ssse3(uint8_t *dst, const uint8_t *src, const uint8_t *src2, int dstStride, int src2Stride);
 
 #else // ARCH_X86_64
 #define QPEL_H264_H16_XMM(OPNAME, OP, MMX)\
-static av_always_inline void ff_ ## OPNAME ## h264_qpel16_h_lowpass_l2_ ## MMX(uint8_t *dst, uint8_t *src, uint8_t *src2, int dstStride, int src2Stride){\
+static av_always_inline void ff_ ## OPNAME ## h264_qpel16_h_lowpass_l2_ ## MMX(uint8_t *dst, const uint8_t *src, const uint8_t *src2, int dstStride, int src2Stride){\
     ff_ ## OPNAME ## h264_qpel8_h_lowpass_l2_ ## MMX(dst  , src  , src2  , dstStride, src2Stride);\
     ff_ ## OPNAME ## h264_qpel8_h_lowpass_l2_ ## MMX(dst+8, src+8, src2+8, dstStride, src2Stride);\
     src += 8*dstStride;\
@@ -180,7 +180,7 @@ static av_always_inline void ff_ ## OPNAME ## h264_qpel16_h_lowpass_l2_ ## MMX(u
 
 #define QPEL_H264_H_XMM(OPNAME, OP, MMX)\
 QPEL_H264_H16_XMM(OPNAME, OP, MMX)\
-static av_always_inline void ff_ ## OPNAME ## h264_qpel16_h_lowpass_ ## MMX(uint8_t *dst, uint8_t *src, int dstStride, int srcStride){\
+static av_always_inline void ff_ ## OPNAME ## h264_qpel16_h_lowpass_ ## MMX(uint8_t *dst, const uint8_t *src, int dstStride, int srcStride){\
     ff_ ## OPNAME ## h264_qpel8_h_lowpass_ ## MMX(dst  , src  , dstStride, srcStride);\
     ff_ ## OPNAME ## h264_qpel8_h_lowpass_ ## MMX(dst+8, src+8, dstStride, srcStride);\
     src += 8*srcStride;\
@@ -190,16 +190,16 @@ static av_always_inline void ff_ ## OPNAME ## h264_qpel16_h_lowpass_ ## MMX(uint
 }\
 
 #define QPEL_H264_V_XMM(OPNAME, OP, MMX)\
-static av_always_inline void ff_ ## OPNAME ## h264_qpel8_v_lowpass_ ## MMX(uint8_t *dst, uint8_t *src, int dstStride, int srcStride){\
+static av_always_inline void ff_ ## OPNAME ## h264_qpel8_v_lowpass_ ## MMX(uint8_t *dst, const uint8_t *src, int dstStride, int srcStride){\
     ff_ ## OPNAME ## h264_qpel8or16_v_lowpass_ ## MMX(dst  , src  , dstStride, srcStride, 8);\
 }\
-static av_always_inline void ff_ ## OPNAME ## h264_qpel16_v_lowpass_ ## MMX(uint8_t *dst, uint8_t *src, int dstStride, int srcStride){\
+static av_always_inline void ff_ ## OPNAME ## h264_qpel16_v_lowpass_ ## MMX(uint8_t *dst, const uint8_t *src, int dstStride, int srcStride){\
     ff_ ## OPNAME ## h264_qpel8or16_v_lowpass_ ## MMX(dst  , src  , dstStride, srcStride, 16);\
     ff_ ## OPNAME ## h264_qpel8or16_v_lowpass_ ## MMX(dst+8, src+8, dstStride, srcStride, 16);\
 }
 
 static av_always_inline void put_h264_qpel8or16_hv1_lowpass_sse2(int16_t *tmp,
-                                                                 uint8_t *src,
+                                                                 const uint8_t *src,
                                                                  int tmpStride,
                                                                  int srcStride,
                                                                  int size)
@@ -214,14 +214,14 @@ static av_always_inline void put_h264_qpel8or16_hv1_lowpass_sse2(int16_t *tmp,
 }
 
 #define QPEL_H264_HV_XMM(OPNAME, OP, MMX)\
-static av_always_inline void ff_ ## OPNAME ## h264_qpel8or16_hv_lowpass_ ## MMX(uint8_t *dst, int16_t *tmp, uint8_t *src, int dstStride, int tmpStride, int srcStride, int size){\
+static av_always_inline void ff_ ## OPNAME ## h264_qpel8or16_hv_lowpass_ ## MMX(uint8_t *dst, int16_t *tmp, const uint8_t *src, int dstStride, int tmpStride, int srcStride, int size){\
     put_h264_qpel8or16_hv1_lowpass_sse2(tmp, src, tmpStride, srcStride, size);\
     ff_ ## OPNAME ## h264_qpel8or16_hv2_lowpass_ ## MMX(dst, tmp, dstStride, tmpStride, size);\
 }\
-static av_always_inline void ff_ ## OPNAME ## h264_qpel8_hv_lowpass_ ## MMX(uint8_t *dst, int16_t *tmp, uint8_t *src, int dstStride, int tmpStride, int srcStride){\
+static av_always_inline void ff_ ## OPNAME ## h264_qpel8_hv_lowpass_ ## MMX(uint8_t *dst, int16_t *tmp, const uint8_t *src, int dstStride, int tmpStride, int srcStride){\
     ff_ ## OPNAME ## h264_qpel8or16_hv_lowpass_ ## MMX(dst, tmp, src, dstStride, tmpStride, srcStride, 8);\
 }\
-static av_always_inline void ff_ ## OPNAME ## h264_qpel16_hv_lowpass_ ## MMX(uint8_t *dst, int16_t *tmp, uint8_t *src, int dstStride, int tmpStride, int srcStride){\
+static av_always_inline void ff_ ## OPNAME ## h264_qpel16_hv_lowpass_ ## MMX(uint8_t *dst, int16_t *tmp, const uint8_t *src, int dstStride, int tmpStride, int srcStride){\
     ff_ ## OPNAME ## h264_qpel8or16_hv_lowpass_ ## MMX(dst, tmp, src, dstStride, tmpStride, srcStride, 16);\
 }\
 
@@ -244,12 +244,12 @@ H264_MC_V(OPNAME, SIZE, MMX, ALIGN)\
 H264_MC_H(OPNAME, SIZE, MMX, ALIGN)\
 H264_MC_HV(OPNAME, SIZE, MMX, ALIGN)\
 
-static void put_h264_qpel16_mc00_sse2 (uint8_t *dst, uint8_t *src,
+static void put_h264_qpel16_mc00_sse2 (uint8_t *dst, const uint8_t *src,
                                        ptrdiff_t stride)
 {
     ff_put_pixels16_sse2(dst, src, stride, 16);
 }
-static void avg_h264_qpel16_mc00_sse2 (uint8_t *dst, uint8_t *src,
+static void avg_h264_qpel16_mc00_sse2 (uint8_t *dst, const uint8_t *src,
                                        ptrdiff_t stride)
 {
     ff_avg_pixels16_sse2(dst, src, stride, 16);
@@ -258,41 +258,41 @@ static void avg_h264_qpel16_mc00_sse2 (uint8_t *dst, uint8_t *src,
 #define avg_h264_qpel8_mc00_sse2 avg_h264_qpel8_mc00_mmxext
 
 #define H264_MC_C(OPNAME, SIZE, MMX, ALIGN) \
-static void OPNAME ## h264_qpel ## SIZE ## _mc00_ ## MMX (uint8_t *dst, uint8_t *src, ptrdiff_t stride)\
+static void OPNAME ## h264_qpel ## SIZE ## _mc00_ ## MMX (uint8_t *dst, const uint8_t *src, ptrdiff_t stride)\
 {\
     ff_ ## OPNAME ## pixels ## SIZE ## _ ## MMX(dst, src, stride, SIZE);\
 }\
 
 #define H264_MC_H(OPNAME, SIZE, MMX, ALIGN) \
-static void OPNAME ## h264_qpel ## SIZE ## _mc10_ ## MMX(uint8_t *dst, uint8_t *src, ptrdiff_t stride)\
+static void OPNAME ## h264_qpel ## SIZE ## _mc10_ ## MMX(uint8_t *dst, const uint8_t *src, ptrdiff_t stride)\
 {\
     ff_ ## OPNAME ## h264_qpel ## SIZE ## _h_lowpass_l2_ ## MMX(dst, src, src, stride, stride);\
 }\
 \
-static void OPNAME ## h264_qpel ## SIZE ## _mc20_ ## MMX(uint8_t *dst, uint8_t *src, ptrdiff_t stride)\
+static void OPNAME ## h264_qpel ## SIZE ## _mc20_ ## MMX(uint8_t *dst, const uint8_t *src, ptrdiff_t stride)\
 {\
     ff_ ## OPNAME ## h264_qpel ## SIZE ## _h_lowpass_ ## MMX(dst, src, stride, stride);\
 }\
 \
-static void OPNAME ## h264_qpel ## SIZE ## _mc30_ ## MMX(uint8_t *dst, uint8_t *src, ptrdiff_t stride)\
+static void OPNAME ## h264_qpel ## SIZE ## _mc30_ ## MMX(uint8_t *dst, const uint8_t *src, ptrdiff_t stride)\
 {\
     ff_ ## OPNAME ## h264_qpel ## SIZE ## _h_lowpass_l2_ ## MMX(dst, src, src+1, stride, stride);\
 }\
 
 #define H264_MC_V(OPNAME, SIZE, MMX, ALIGN) \
-static void OPNAME ## h264_qpel ## SIZE ## _mc01_ ## MMX(uint8_t *dst, uint8_t *src, ptrdiff_t stride)\
+static void OPNAME ## h264_qpel ## SIZE ## _mc01_ ## MMX(uint8_t *dst, const uint8_t *src, ptrdiff_t stride)\
 {\
     DECLARE_ALIGNED(ALIGN, uint8_t, temp)[SIZE*SIZE];\
     ff_put_h264_qpel ## SIZE ## _v_lowpass_ ## MMX(temp, src, SIZE, stride);\
     ff_ ## OPNAME ## pixels ## SIZE ## _l2_ ## MMX(dst, src, temp, stride, stride, SIZE);\
 }\
 \
-static void OPNAME ## h264_qpel ## SIZE ## _mc02_ ## MMX(uint8_t *dst, uint8_t *src, ptrdiff_t stride)\
+static void OPNAME ## h264_qpel ## SIZE ## _mc02_ ## MMX(uint8_t *dst, const uint8_t *src, ptrdiff_t stride)\
 {\
     ff_ ## OPNAME ## h264_qpel ## SIZE ## _v_lowpass_ ## MMX(dst, src, stride, stride);\
 }\
 \
-static void OPNAME ## h264_qpel ## SIZE ## _mc03_ ## MMX(uint8_t *dst, uint8_t *src, ptrdiff_t stride)\
+static void OPNAME ## h264_qpel ## SIZE ## _mc03_ ## MMX(uint8_t *dst, const uint8_t *src, ptrdiff_t stride)\
 {\
     DECLARE_ALIGNED(ALIGN, uint8_t, temp)[SIZE*SIZE];\
     ff_put_h264_qpel ## SIZE ## _v_lowpass_ ## MMX(temp, src, SIZE, stride);\
@@ -300,41 +300,41 @@ static void OPNAME ## h264_qpel ## SIZE ## _mc03_ ## MMX(uint8_t *dst, uint8_t *
 }\
 
 #define H264_MC_HV(OPNAME, SIZE, MMX, ALIGN) \
-static void OPNAME ## h264_qpel ## SIZE ## _mc11_ ## MMX(uint8_t *dst, uint8_t *src, ptrdiff_t stride)\
+static void OPNAME ## h264_qpel ## SIZE ## _mc11_ ## MMX(uint8_t *dst, const uint8_t *src, ptrdiff_t stride)\
 {\
     DECLARE_ALIGNED(ALIGN, uint8_t, temp)[SIZE*SIZE];\
     ff_put_h264_qpel ## SIZE ## _v_lowpass_ ## MMX(temp, src, SIZE, stride);\
     ff_ ## OPNAME ## h264_qpel ## SIZE ## _h_lowpass_l2_ ## MMX(dst, src, temp, stride, SIZE);\
 }\
 \
-static void OPNAME ## h264_qpel ## SIZE ## _mc31_ ## MMX(uint8_t *dst, uint8_t *src, ptrdiff_t stride)\
+static void OPNAME ## h264_qpel ## SIZE ## _mc31_ ## MMX(uint8_t *dst, const uint8_t *src, ptrdiff_t stride)\
 {\
     DECLARE_ALIGNED(ALIGN, uint8_t, temp)[SIZE*SIZE];\
     ff_put_h264_qpel ## SIZE ## _v_lowpass_ ## MMX(temp, src+1, SIZE, stride);\
     ff_ ## OPNAME ## h264_qpel ## SIZE ## _h_lowpass_l2_ ## MMX(dst, src, temp, stride, SIZE);\
 }\
 \
-static void OPNAME ## h264_qpel ## SIZE ## _mc13_ ## MMX(uint8_t *dst, uint8_t *src, ptrdiff_t stride)\
+static void OPNAME ## h264_qpel ## SIZE ## _mc13_ ## MMX(uint8_t *dst, const uint8_t *src, ptrdiff_t stride)\
 {\
     DECLARE_ALIGNED(ALIGN, uint8_t, temp)[SIZE*SIZE];\
     ff_put_h264_qpel ## SIZE ## _v_lowpass_ ## MMX(temp, src, SIZE, stride);\
     ff_ ## OPNAME ## h264_qpel ## SIZE ## _h_lowpass_l2_ ## MMX(dst, src+stride, temp, stride, SIZE);\
 }\
 \
-static void OPNAME ## h264_qpel ## SIZE ## _mc33_ ## MMX(uint8_t *dst, uint8_t *src, ptrdiff_t stride)\
+static void OPNAME ## h264_qpel ## SIZE ## _mc33_ ## MMX(uint8_t *dst, const uint8_t *src, ptrdiff_t stride)\
 {\
     DECLARE_ALIGNED(ALIGN, uint8_t, temp)[SIZE*SIZE];\
     ff_put_h264_qpel ## SIZE ## _v_lowpass_ ## MMX(temp, src+1, SIZE, stride);\
     ff_ ## OPNAME ## h264_qpel ## SIZE ## _h_lowpass_l2_ ## MMX(dst, src+stride, temp, stride, SIZE);\
 }\
 \
-static void OPNAME ## h264_qpel ## SIZE ## _mc22_ ## MMX(uint8_t *dst, uint8_t *src, ptrdiff_t stride)\
+static void OPNAME ## h264_qpel ## SIZE ## _mc22_ ## MMX(uint8_t *dst, const uint8_t *src, ptrdiff_t stride)\
 {\
     DECLARE_ALIGNED(ALIGN, uint16_t, temp)[SIZE*(SIZE<8?12:24)];\
     ff_ ## OPNAME ## h264_qpel ## SIZE ## _hv_lowpass_ ## MMX(dst, temp, src, stride, SIZE, stride);\
 }\
 \
-static void OPNAME ## h264_qpel ## SIZE ## _mc21_ ## MMX(uint8_t *dst, uint8_t *src, ptrdiff_t stride)\
+static void OPNAME ## h264_qpel ## SIZE ## _mc21_ ## MMX(uint8_t *dst, const uint8_t *src, ptrdiff_t stride)\
 {\
     DECLARE_ALIGNED(ALIGN, uint8_t, temp)[SIZE*(SIZE<8?12:24)*2 + SIZE*SIZE];\
     uint8_t * const halfHV= temp;\
@@ -344,7 +344,7 @@ static void OPNAME ## h264_qpel ## SIZE ## _mc21_ ## MMX(uint8_t *dst, uint8_t *
     ff_ ## OPNAME ## h264_qpel ## SIZE ## _h_lowpass_l2_ ## MMX(dst, src, halfHV, stride, SIZE);\
 }\
 \
-static void OPNAME ## h264_qpel ## SIZE ## _mc23_ ## MMX(uint8_t *dst, uint8_t *src, ptrdiff_t stride)\
+static void OPNAME ## h264_qpel ## SIZE ## _mc23_ ## MMX(uint8_t *dst, const uint8_t *src, ptrdiff_t stride)\
 {\
     DECLARE_ALIGNED(ALIGN, uint8_t, temp)[SIZE*(SIZE<8?12:24)*2 + SIZE*SIZE];\
     uint8_t * const halfHV= temp;\
@@ -354,7 +354,7 @@ static void OPNAME ## h264_qpel ## SIZE ## _mc23_ ## MMX(uint8_t *dst, uint8_t *
     ff_ ## OPNAME ## h264_qpel ## SIZE ## _h_lowpass_l2_ ## MMX(dst, src+stride, halfHV, stride, SIZE);\
 }\
 \
-static void OPNAME ## h264_qpel ## SIZE ## _mc12_ ## MMX(uint8_t *dst, uint8_t *src, ptrdiff_t stride)\
+static void OPNAME ## h264_qpel ## SIZE ## _mc12_ ## MMX(uint8_t *dst, const uint8_t *src, ptrdiff_t stride)\
 {\
     DECLARE_ALIGNED(ALIGN, uint8_t, temp)[SIZE*(SIZE<8?12:24)*2 + SIZE*SIZE];\
     uint8_t * const halfHV= temp;\
@@ -364,7 +364,7 @@ static void OPNAME ## h264_qpel ## SIZE ## _mc12_ ## MMX(uint8_t *dst, uint8_t *
     ff_ ## OPNAME ## pixels ## SIZE ## _l2_shift5_mmxext(dst, halfV+2, halfHV, stride, SIZE, SIZE);\
 }\
 \
-static void OPNAME ## h264_qpel ## SIZE ## _mc32_ ## MMX(uint8_t *dst, uint8_t *src, ptrdiff_t stride)\
+static void OPNAME ## h264_qpel ## SIZE ## _mc32_ ## MMX(uint8_t *dst, const uint8_t *src, ptrdiff_t stride)\
 {\
     DECLARE_ALIGNED(ALIGN, uint8_t, temp)[SIZE*(SIZE<8?12:24)*2 + SIZE*SIZE];\
     uint8_t * const halfHV= temp;\
@@ -409,7 +409,7 @@ H264_MC_816(H264_MC_HV, ssse3)
 //10bit
 #define LUMA_MC_OP(OP, NUM, DEPTH, TYPE, OPT) \
 void ff_ ## OP ## _h264_qpel ## NUM ## _ ## TYPE ## _ ## DEPTH ## _ ## OPT \
-    (uint8_t *dst, uint8_t *src, ptrdiff_t stride);
+    (uint8_t *dst, const uint8_t *src, ptrdiff_t stride);
 
 #define LUMA_MC_ALL(DEPTH, TYPE, OPT) \
     LUMA_MC_OP(put,  4, DEPTH, TYPE, OPT) \
@@ -466,7 +466,7 @@ LUMA_MC_816(10, mc23, sse2)
 LUMA_MC_816(10, mc33, sse2)
 
 #define QPEL16_OPMC(OP, MC, MMX)\
-void ff_ ## OP ## _h264_qpel16_ ## MC ## _10_ ## MMX(uint8_t *dst, uint8_t *src, ptrdiff_t stride){\
+void ff_ ## OP ## _h264_qpel16_ ## MC ## _10_ ## MMX(uint8_t *dst, const uint8_t *src, ptrdiff_t stride){\
     ff_ ## OP ## _h264_qpel8_ ## MC ## _10_ ## MMX(dst   , src   , stride);\
     ff_ ## OP ## _h264_qpel8_ ## MC ## _10_ ## MMX(dst+16, src+16, stride);\
     src += 8*stride;\
diff --git a/libavcodec/x86/qpeldsp_init.c b/libavcodec/x86/qpeldsp_init.c
index 435b7651fd..cdefe50a3c 100644
--- a/libavcodec/x86/qpeldsp_init.c
+++ b/libavcodec/x86/qpeldsp_init.c
@@ -29,44 +29,53 @@
 #include "libavcodec/qpeldsp.h"
 #include "fpel.h"
 
-void ff_put_pixels8_l2_mmxext(uint8_t *dst, uint8_t *src1, uint8_t *src2,
+void ff_put_pixels8_l2_mmxext(uint8_t *dst,
+                              const uint8_t *src1, const uint8_t *src2,
                               int dstStride, int src1Stride, int h);
-void ff_put_no_rnd_pixels8_l2_mmxext(uint8_t *dst, uint8_t *src1,
-                                     uint8_t *src2, int dstStride,
-                                     int src1Stride, int h);
-void ff_avg_pixels8_l2_mmxext(uint8_t *dst, uint8_t *src1, uint8_t *src2,
+void ff_put_no_rnd_pixels8_l2_mmxext(uint8_t *dst,
+                                     const uint8_t *src1, const uint8_t *src2,
+                                     int dstStride, int src1Stride, int h);
+void ff_avg_pixels8_l2_mmxext(uint8_t *dst,
+                              const uint8_t *src1, const uint8_t *src2,
                               int dstStride, int src1Stride, int h);
-void ff_put_pixels16_l2_mmxext(uint8_t *dst, uint8_t *src1, uint8_t *src2,
+void ff_put_pixels16_l2_mmxext(uint8_t *dst,
+                               const uint8_t *src1, const uint8_t *src2,
                                int dstStride, int src1Stride, int h);
-void ff_avg_pixels16_l2_mmxext(uint8_t *dst, uint8_t *src1, uint8_t *src2,
+void ff_avg_pixels16_l2_mmxext(uint8_t *dst,
+                               const uint8_t *src1, const uint8_t *src2,
                                int dstStride, int src1Stride, int h);
-void ff_put_no_rnd_pixels16_l2_mmxext(uint8_t *dst, uint8_t *src1, uint8_t *src2,
+void ff_put_no_rnd_pixels16_l2_mmxext(uint8_t *dst,
+                                      const uint8_t *src1, const uint8_t *src2,
                                       int dstStride, int src1Stride, int h);
-void ff_put_mpeg4_qpel16_h_lowpass_mmxext(uint8_t *dst, uint8_t *src,
+void ff_put_mpeg4_qpel16_h_lowpass_mmxext(uint8_t *dst, const uint8_t *src,
                                           int dstStride, int srcStride, int h);
-void ff_avg_mpeg4_qpel16_h_lowpass_mmxext(uint8_t *dst, uint8_t *src,
+void ff_avg_mpeg4_qpel16_h_lowpass_mmxext(uint8_t *dst, const uint8_t *src,
                                           int dstStride, int srcStride, int h);
-void ff_put_no_rnd_mpeg4_qpel16_h_lowpass_mmxext(uint8_t *dst, uint8_t *src,
+void ff_put_no_rnd_mpeg4_qpel16_h_lowpass_mmxext(uint8_t *dst,
+                                                 const uint8_t *src,
                                                  int dstStride, int srcStride,
                                                  int h);
-void ff_put_mpeg4_qpel8_h_lowpass_mmxext(uint8_t *dst, uint8_t *src,
+void ff_put_mpeg4_qpel8_h_lowpass_mmxext(uint8_t *dst, const uint8_t *src,
                                          int dstStride, int srcStride, int h);
-void ff_avg_mpeg4_qpel8_h_lowpass_mmxext(uint8_t *dst, uint8_t *src,
+void ff_avg_mpeg4_qpel8_h_lowpass_mmxext(uint8_t *dst, const uint8_t *src,
                                          int dstStride, int srcStride, int h);
-void ff_put_no_rnd_mpeg4_qpel8_h_lowpass_mmxext(uint8_t *dst, uint8_t *src,
+void ff_put_no_rnd_mpeg4_qpel8_h_lowpass_mmxext(uint8_t *dst,
+                                                const uint8_t *src,
                                                 int dstStride, int srcStride,
                                                 int h);
-void ff_put_mpeg4_qpel16_v_lowpass_mmxext(uint8_t *dst, uint8_t *src,
+void ff_put_mpeg4_qpel16_v_lowpass_mmxext(uint8_t *dst, const uint8_t *src,
                                           int dstStride, int srcStride);
-void ff_avg_mpeg4_qpel16_v_lowpass_mmxext(uint8_t *dst, uint8_t *src,
+void ff_avg_mpeg4_qpel16_v_lowpass_mmxext(uint8_t *dst, const uint8_t *src,
                                           int dstStride, int srcStride);
-void ff_put_no_rnd_mpeg4_qpel16_v_lowpass_mmxext(uint8_t *dst, uint8_t *src,
+void ff_put_no_rnd_mpeg4_qpel16_v_lowpass_mmxext(uint8_t *dst,
+                                                 const uint8_t *src,
                                                  int dstStride, int srcStride);
-void ff_put_mpeg4_qpel8_v_lowpass_mmxext(uint8_t *dst, uint8_t *src,
+void ff_put_mpeg4_qpel8_v_lowpass_mmxext(uint8_t *dst, const uint8_t *src,
                                          int dstStride, int srcStride);
-void ff_avg_mpeg4_qpel8_v_lowpass_mmxext(uint8_t *dst, uint8_t *src,
+void ff_avg_mpeg4_qpel8_v_lowpass_mmxext(uint8_t *dst, const uint8_t *src,
                                          int dstStride, int srcStride);
-void ff_put_no_rnd_mpeg4_qpel8_v_lowpass_mmxext(uint8_t *dst, uint8_t *src,
+void ff_put_no_rnd_mpeg4_qpel8_v_lowpass_mmxext(uint8_t *dst,
+                                                const uint8_t *src,
                                                 int dstStride, int srcStride);
 #define ff_put_no_rnd_pixels16_mmxext ff_put_pixels16_mmxext
 #define ff_put_no_rnd_pixels8_mmxext ff_put_pixels8_mmxext
@@ -77,13 +86,15 @@ CALL_2X_PIXELS(ff_avg_pixels16_mmxext, ff_avg_pixels8_mmxext, 8)
 CALL_2X_PIXELS(ff_put_pixels16_mmxext, ff_put_pixels8_mmxext, 8)
 
 #define QPEL_OP(OPNAME, RND, MMX)                                       \
-static void OPNAME ## qpel8_mc00_ ## MMX(uint8_t *dst, uint8_t *src,    \
+static void OPNAME ## qpel8_mc00_ ## MMX(uint8_t *dst,                  \
+                                         const uint8_t *src,            \
                                          ptrdiff_t stride)              \
 {                                                                       \
     ff_ ## OPNAME ## pixels8_ ## MMX(dst, src, stride, 8);              \
 }                                                                       \
                                                                         \
-static void OPNAME ## qpel8_mc10_ ## MMX(uint8_t *dst, uint8_t *src,    \
+static void OPNAME ## qpel8_mc10_ ## MMX(uint8_t *dst,                  \
+                                         const uint8_t *src,            \
                                          ptrdiff_t stride)              \
 {                                                                       \
     uint64_t temp[8];                                                   \
@@ -94,14 +105,16 @@ static void OPNAME ## qpel8_mc10_ ## MMX(uint8_t *dst, uint8_t *src,    \
                                         stride, stride, 8);             \
 }                                                                       \
                                                                         \
-static void OPNAME ## qpel8_mc20_ ## MMX(uint8_t *dst, uint8_t *src,    \
+static void OPNAME ## qpel8_mc20_ ## MMX(uint8_t *dst,                  \
+                                         const uint8_t *src,            \
                                          ptrdiff_t stride)              \
 {                                                                       \
     ff_ ## OPNAME ## mpeg4_qpel8_h_lowpass_ ## MMX(dst, src, stride,    \
                                                    stride, 8);          \
 }                                                                       \
                                                                         \
-static void OPNAME ## qpel8_mc30_ ## MMX(uint8_t *dst, uint8_t *src,    \
+static void OPNAME ## qpel8_mc30_ ## MMX(uint8_t *dst,                  \
+                                         const uint8_t *src,            \
                                          ptrdiff_t stride)              \
 {                                                                       \
     uint64_t temp[8];                                                   \
@@ -112,7 +125,8 @@ static void OPNAME ## qpel8_mc30_ ## MMX(uint8_t *dst, uint8_t *src,    \
                                         stride, 8);                     \
 }                                                                       \
                                                                         \
-static void OPNAME ## qpel8_mc01_ ## MMX(uint8_t *dst, uint8_t *src,    \
+static void OPNAME ## qpel8_mc01_ ## MMX(uint8_t *dst,                  \
+                                         const uint8_t *src,            \
                                          ptrdiff_t stride)              \
 {                                                                       \
     uint64_t temp[8];                                                   \
@@ -123,14 +137,16 @@ static void OPNAME ## qpel8_mc01_ ## MMX(uint8_t *dst, uint8_t *src,    \
                                         stride, stride, 8);             \
 }                                                                       \
                                                                         \
-static void OPNAME ## qpel8_mc02_ ## MMX(uint8_t *dst, uint8_t *src,    \
+static void OPNAME ## qpel8_mc02_ ## MMX(uint8_t *dst,                  \
+                                         const uint8_t *src,            \
                                          ptrdiff_t stride)              \
 {                                                                       \
     ff_ ## OPNAME ## mpeg4_qpel8_v_lowpass_ ## MMX(dst, src,            \
                                                    stride, stride);     \
 }                                                                       \
                                                                         \
-static void OPNAME ## qpel8_mc03_ ## MMX(uint8_t *dst, uint8_t *src,    \
+static void OPNAME ## qpel8_mc03_ ## MMX(uint8_t *dst,                  \
+                                         const uint8_t *src,            \
                                          ptrdiff_t stride)              \
 {                                                                       \
     uint64_t temp[8];                                                   \
@@ -141,7 +157,8 @@ static void OPNAME ## qpel8_mc03_ ## MMX(uint8_t *dst, uint8_t *src,    \
                                         stride, 8);                     \
 }                                                                       \
                                                                         \
-static void OPNAME ## qpel8_mc11_ ## MMX(uint8_t *dst, uint8_t *src,    \
+static void OPNAME ## qpel8_mc11_ ## MMX(uint8_t *dst,                  \
+                                         const uint8_t *src,            \
                                          ptrdiff_t stride)              \
 {                                                                       \
     uint64_t half[8 + 9];                                               \
@@ -156,7 +173,8 @@ static void OPNAME ## qpel8_mc11_ ## MMX(uint8_t *dst, uint8_t *src,    \
                                         stride, 8, 8);                  \
 }                                                                       \
                                                                         \
-static void OPNAME ## qpel8_mc31_ ## MMX(uint8_t *dst, uint8_t *src,    \
+static void OPNAME ## qpel8_mc31_ ## MMX(uint8_t *dst,                  \
+                                         const uint8_t *src,            \
                                          ptrdiff_t stride)              \
 {                                                                       \
     uint64_t half[8 + 9];                                               \
@@ -171,7 +189,8 @@ static void OPNAME ## qpel8_mc31_ ## MMX(uint8_t *dst, uint8_t *src,    \
                                         stride, 8, 8);                  \
 }                                                                       \
                                                                         \
-static void OPNAME ## qpel8_mc13_ ## MMX(uint8_t *dst, uint8_t *src,    \
+static void OPNAME ## qpel8_mc13_ ## MMX(uint8_t *dst,                  \
+                                         const uint8_t *src,            \
                                          ptrdiff_t stride)              \
 {                                                                       \
     uint64_t half[8 + 9];                                               \
@@ -186,7 +205,8 @@ static void OPNAME ## qpel8_mc13_ ## MMX(uint8_t *dst, uint8_t *src,    \
                                         stride, 8, 8);                  \
 }                                                                       \
                                                                         \
-static void OPNAME ## qpel8_mc33_ ## MMX(uint8_t *dst, uint8_t *src,    \
+static void OPNAME ## qpel8_mc33_ ## MMX(uint8_t *dst,                  \
+                                         const uint8_t *src,            \
                                          ptrdiff_t stride)              \
 {                                                                       \
     uint64_t half[8 + 9];                                               \
@@ -201,7 +221,8 @@ static void OPNAME ## qpel8_mc33_ ## MMX(uint8_t *dst, uint8_t *src,    \
                                         stride, 8, 8);                  \
 }                                                                       \
                                                                         \
-static void OPNAME ## qpel8_mc21_ ## MMX(uint8_t *dst, uint8_t *src,    \
+static void OPNAME ## qpel8_mc21_ ## MMX(uint8_t *dst,                  \
+                                         const uint8_t *src,            \
                                          ptrdiff_t stride)              \
 {                                                                       \
     uint64_t half[8 + 9];                                               \
@@ -214,7 +235,8 @@ static void OPNAME ## qpel8_mc21_ ## MMX(uint8_t *dst, uint8_t *src,    \
                                         stride, 8, 8);                  \
 }                                                                       \
                                                                         \
-static void OPNAME ## qpel8_mc23_ ## MMX(uint8_t *dst, uint8_t *src,    \
+static void OPNAME ## qpel8_mc23_ ## MMX(uint8_t *dst,                  \
+                                         const uint8_t *src,            \
                                          ptrdiff_t stride)              \
 {                                                                       \
     uint64_t half[8 + 9];                                               \
@@ -227,7 +249,8 @@ static void OPNAME ## qpel8_mc23_ ## MMX(uint8_t *dst, uint8_t *src,    \
                                         stride, 8, 8);                  \
 }                                                                       \
                                                                         \
-static void OPNAME ## qpel8_mc12_ ## MMX(uint8_t *dst, uint8_t *src,    \
+static void OPNAME ## qpel8_mc12_ ## MMX(uint8_t *dst,                  \
+                                         const uint8_t *src,            \
                                          ptrdiff_t stride)              \
 {                                                                       \
     uint64_t half[8 + 9];                                               \
@@ -240,7 +263,8 @@ static void OPNAME ## qpel8_mc12_ ## MMX(uint8_t *dst, uint8_t *src,    \
                                                    stride, 8);          \
 }                                                                       \
                                                                         \
-static void OPNAME ## qpel8_mc32_ ## MMX(uint8_t *dst, uint8_t *src,    \
+static void OPNAME ## qpel8_mc32_ ## MMX(uint8_t *dst,                  \
+                                         const uint8_t *src,            \
                                          ptrdiff_t stride)              \
 {                                                                       \
     uint64_t half[8 + 9];                                               \
@@ -253,7 +277,8 @@ static void OPNAME ## qpel8_mc32_ ## MMX(uint8_t *dst, uint8_t *src,    \
                                                    stride, 8);          \
 }                                                                       \
                                                                         \
-static void OPNAME ## qpel8_mc22_ ## MMX(uint8_t *dst, uint8_t *src,    \
+static void OPNAME ## qpel8_mc22_ ## MMX(uint8_t *dst,                  \
+                                         const uint8_t *src,            \
                                          ptrdiff_t stride)              \
 {                                                                       \
     uint64_t half[9];                                                   \
@@ -264,13 +289,15 @@ static void OPNAME ## qpel8_mc22_ ## MMX(uint8_t *dst, uint8_t *src,    \
                                                    stride, 8);          \
 }                                                                       \
                                                                         \
-static void OPNAME ## qpel16_mc00_ ## MMX(uint8_t *dst, uint8_t *src,   \
+static void OPNAME ## qpel16_mc00_ ## MMX(uint8_t *dst,                 \
+                                          const uint8_t *src,           \
                                           ptrdiff_t stride)             \
 {                                                                       \
     ff_ ## OPNAME ## pixels16_ ## MMX(dst, src, stride, 16);            \
 }                                                                       \
                                                                         \
-static void OPNAME ## qpel16_mc10_ ## MMX(uint8_t *dst, uint8_t *src,   \
+static void OPNAME ## qpel16_mc10_ ## MMX(uint8_t *dst,                 \
+                                          const uint8_t *src,           \
                                           ptrdiff_t stride)             \
 {                                                                       \
     uint64_t temp[32];                                                  \
@@ -281,14 +308,16 @@ static void OPNAME ## qpel16_mc10_ ## MMX(uint8_t *dst, uint8_t *src,   \
                                          stride, 16);                   \
 }                                                                       \
                                                                         \
-static void OPNAME ## qpel16_mc20_ ## MMX(uint8_t *dst, uint8_t *src,   \
+static void OPNAME ## qpel16_mc20_ ## MMX(uint8_t *dst,                 \
+                                          const uint8_t *src,           \
                                           ptrdiff_t stride)             \
 {                                                                       \
     ff_ ## OPNAME ## mpeg4_qpel16_h_lowpass_ ## MMX(dst, src,           \
                                                     stride, stride, 16);\
 }                                                                       \
                                                                         \
-static void OPNAME ## qpel16_mc30_ ## MMX(uint8_t *dst, uint8_t *src,   \
+static void OPNAME ## qpel16_mc30_ ## MMX(uint8_t *dst,                 \
+                                          const uint8_t *src,           \
                                           ptrdiff_t stride)             \
 {                                                                       \
     uint64_t temp[32];                                                  \
@@ -299,7 +328,8 @@ static void OPNAME ## qpel16_mc30_ ## MMX(uint8_t *dst, uint8_t *src,   \
                                          stride, stride, 16);           \
 }                                                                       \
                                                                         \
-static void OPNAME ## qpel16_mc01_ ## MMX(uint8_t *dst, uint8_t *src,   \
+static void OPNAME ## qpel16_mc01_ ## MMX(uint8_t *dst,                 \
+                                          const uint8_t *src,           \
                                           ptrdiff_t stride)             \
 {                                                                       \
     uint64_t temp[32];                                                  \
@@ -310,14 +340,16 @@ static void OPNAME ## qpel16_mc01_ ## MMX(uint8_t *dst, uint8_t *src,   \
                                          stride, 16);                   \
 }                                                                       \
                                                                         \
-static void OPNAME ## qpel16_mc02_ ## MMX(uint8_t *dst, uint8_t *src,   \
+static void OPNAME ## qpel16_mc02_ ## MMX(uint8_t *dst,                 \
+                                          const uint8_t *src,           \
                                           ptrdiff_t stride)             \
 {                                                                       \
     ff_ ## OPNAME ## mpeg4_qpel16_v_lowpass_ ## MMX(dst, src,           \
                                                     stride, stride);    \
 }                                                                       \
                                                                         \
-static void OPNAME ## qpel16_mc03_ ## MMX(uint8_t *dst, uint8_t *src,   \
+static void OPNAME ## qpel16_mc03_ ## MMX(uint8_t *dst,                 \
+                                          const uint8_t *src,           \
                                           ptrdiff_t stride)             \
 {                                                                       \
     uint64_t temp[32];                                                  \
@@ -328,7 +360,8 @@ static void OPNAME ## qpel16_mc03_ ## MMX(uint8_t *dst, uint8_t *src,   \
                                          stride, stride, 16);           \
 }                                                                       \
                                                                         \
-static void OPNAME ## qpel16_mc11_ ## MMX(uint8_t *dst, uint8_t *src,   \
+static void OPNAME ## qpel16_mc11_ ## MMX(uint8_t *dst,                 \
+                                          const uint8_t *src,           \
                                           ptrdiff_t stride)             \
 {                                                                       \
     uint64_t half[16 * 2 + 17 * 2];                                     \
@@ -344,7 +377,8 @@ static void OPNAME ## qpel16_mc11_ ## MMX(uint8_t *dst, uint8_t *src,   \
                                          stride, 16, 16);               \
 }                                                                       \
                                                                         \
-static void OPNAME ## qpel16_mc31_ ## MMX(uint8_t *dst, uint8_t *src,   \
+static void OPNAME ## qpel16_mc31_ ## MMX(uint8_t *dst,                 \
+                                          const uint8_t *src,           \
                                           ptrdiff_t stride)             \
 {                                                                       \
     uint64_t half[16 * 2 + 17 * 2];                                     \
@@ -360,7 +394,8 @@ static void OPNAME ## qpel16_mc31_ ## MMX(uint8_t *dst, uint8_t *src,   \
                                          stride, 16, 16);               \
 }                                                                       \
                                                                         \
-static void OPNAME ## qpel16_mc13_ ## MMX(uint8_t *dst, uint8_t *src,   \
+static void OPNAME ## qpel16_mc13_ ## MMX(uint8_t *dst,                 \
+                                          const uint8_t *src,           \
                                           ptrdiff_t stride)             \
 {                                                                       \
     uint64_t half[16 * 2 + 17 * 2];                                     \
@@ -376,7 +411,8 @@ static void OPNAME ## qpel16_mc13_ ## MMX(uint8_t *dst, uint8_t *src,   \
                                          stride, 16, 16);               \
 }                                                                       \
                                                                         \
-static void OPNAME ## qpel16_mc33_ ## MMX(uint8_t *dst, uint8_t *src,   \
+static void OPNAME ## qpel16_mc33_ ## MMX(uint8_t *dst,                 \
+                                          const uint8_t *src,           \
                                           ptrdiff_t stride)             \
 {                                                                       \
     uint64_t half[16 * 2 + 17 * 2];                                     \
@@ -392,7 +428,8 @@ static void OPNAME ## qpel16_mc33_ ## MMX(uint8_t *dst, uint8_t *src,   \
                                          stride, 16, 16);               \
 }                                                                       \
                                                                         \
-static void OPNAME ## qpel16_mc21_ ## MMX(uint8_t *dst, uint8_t *src,   \
+static void OPNAME ## qpel16_mc21_ ## MMX(uint8_t *dst,                 \
+                                          const uint8_t *src,           \
                                           ptrdiff_t stride)             \
 {                                                                       \
     uint64_t half[16 * 2 + 17 * 2];                                     \
@@ -406,7 +443,8 @@ static void OPNAME ## qpel16_mc21_ ## MMX(uint8_t *dst, uint8_t *src,   \
                                          stride, 16, 16);               \
 }                                                                       \
                                                                         \
-static void OPNAME ## qpel16_mc23_ ## MMX(uint8_t *dst, uint8_t *src,   \
+static void OPNAME ## qpel16_mc23_ ## MMX(uint8_t *dst,                 \
+                                          const uint8_t *src,           \
                                           ptrdiff_t stride)             \
 {                                                                       \
     uint64_t half[16 * 2 + 17 * 2];                                     \
@@ -420,7 +458,8 @@ static void OPNAME ## qpel16_mc23_ ## MMX(uint8_t *dst, uint8_t *src,   \
                                          stride, 16, 16);               \
 }                                                                       \
                                                                         \
-static void OPNAME ## qpel16_mc12_ ## MMX(uint8_t *dst, uint8_t *src,   \
+static void OPNAME ## qpel16_mc12_ ## MMX(uint8_t *dst,                 \
+                                          const uint8_t *src,           \
                                           ptrdiff_t stride)             \
 {                                                                       \
     uint64_t half[17 * 2];                                              \
@@ -433,7 +472,8 @@ static void OPNAME ## qpel16_mc12_ ## MMX(uint8_t *dst, uint8_t *src,   \
                                                     stride, 16);        \
 }                                                                       \
                                                                         \
-static void OPNAME ## qpel16_mc32_ ## MMX(uint8_t *dst, uint8_t *src,   \
+static void OPNAME ## qpel16_mc32_ ## MMX(uint8_t *dst,                 \
+                                          const uint8_t *src,           \
                                           ptrdiff_t stride)             \
 {                                                                       \
     uint64_t half[17 * 2];                                              \
@@ -446,7 +486,8 @@ static void OPNAME ## qpel16_mc32_ ## MMX(uint8_t *dst, uint8_t *src,   \
                                                     stride, 16);        \
 }                                                                       \
                                                                         \
-static void OPNAME ## qpel16_mc22_ ## MMX(uint8_t *dst, uint8_t *src,   \
+static void OPNAME ## qpel16_mc22_ ## MMX(uint8_t *dst,                 \
+                                          const uint8_t *src,           \
                                           ptrdiff_t stride)             \
 {                                                                       \
     uint64_t half[17 * 2];                                              \
diff --git a/libavcodec/x86/rv40dsp_init.c b/libavcodec/x86/rv40dsp_init.c
index 8fd2729fd8..e006c76584 100644
--- a/libavcodec/x86/rv40dsp_init.c
+++ b/libavcodec/x86/rv40dsp_init.c
@@ -70,7 +70,7 @@ DECLARE_WEIGHT(ssse3)
  */
 #define QPEL_FUNC_DECL(OP, SIZE, PH, PV, OPT)                           \
 static void OP ## rv40_qpel ##SIZE ##_mc ##PH ##PV ##OPT(uint8_t *dst,  \
-                                                         uint8_t *src,  \
+                                                         const uint8_t *src, \
                                                          ptrdiff_t stride)  \
 {                                                                       \
     int i;                                                              \
@@ -189,22 +189,22 @@ QPEL_FUNCS_SET (OP, 3, 2, OPT)
 #endif /* HAVE_YASM */
 
 #if HAVE_MMX_INLINE
-static void put_rv40_qpel8_mc33_mmx(uint8_t *dst, uint8_t *src,
+static void put_rv40_qpel8_mc33_mmx(uint8_t *dst, const uint8_t *src,
                                     ptrdiff_t stride)
 {
     ff_put_pixels8_xy2_mmx(dst, src, stride, 8);
 }
-static void put_rv40_qpel16_mc33_mmx(uint8_t *dst, uint8_t *src,
+static void put_rv40_qpel16_mc33_mmx(uint8_t *dst, const uint8_t *src,
                                      ptrdiff_t stride)
 {
     ff_put_pixels16_xy2_mmx(dst, src, stride, 16);
 }
-static void avg_rv40_qpel8_mc33_mmx(uint8_t *dst, uint8_t *src,
+static void avg_rv40_qpel8_mc33_mmx(uint8_t *dst, const uint8_t *src,
                                     ptrdiff_t stride)
 {
     ff_avg_pixels8_xy2_mmx(dst, src, stride, 8);
 }
-static void avg_rv40_qpel16_mc33_mmx(uint8_t *dst, uint8_t *src,
+static void avg_rv40_qpel16_mc33_mmx(uint8_t *dst, const uint8_t *src,
                                      ptrdiff_t stride)
 {
     ff_avg_pixels16_xy2_mmx(dst, src, stride, 16);