avcodec/videodsp: Constify buf in VideoDSPContext.prefetch

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>

libavcodec/aarch64/videodsp_init.c

@@ -21,7 +21,7 @@
 #include "libavutil/aarch64/cpu.h"
 #include "libavcodec/videodsp.h"
 
-void ff_prefetch_aarch64(uint8_t *mem, ptrdiff_t stride, int h);
+void ff_prefetch_aarch64(const uint8_t *mem, ptrdiff_t stride, int h);
 
 av_cold void ff_videodsp_init_aarch64(VideoDSPContext *ctx, int bpc)
 {

libavcodec/arm/videodsp_init_armv5te.c

@@ -23,7 +23,7 @@
 #include "libavcodec/videodsp.h"
 #include "videodsp_arm.h"
 
-void ff_prefetch_arm(uint8_t *mem, ptrdiff_t stride, int h);
+void ff_prefetch_arm(const uint8_t *mem, ptrdiff_t stride, int h);
 
 av_cold void ff_videodsp_init_armv5te(VideoDSPContext *ctx, int bpc)
 {

libavcodec/loongarch/videodsp_init.c

@@ -22,7 +22,7 @@
 #include "libavcodec/videodsp.h"
 #include "libavutil/attributes.h"
 
-static void prefetch_loongarch(uint8_t *mem, ptrdiff_t stride, int h)
+static void prefetch_loongarch(const uint8_t *mem, ptrdiff_t stride, int h)
 {
     register const uint8_t *p = mem;
 

libavcodec/mips/videodsp_init.c

@@ -24,7 +24,7 @@
 #include "libavutil/mips/asmdefs.h"
 #include "libavcodec/videodsp.h"
 
-static void prefetch_mips(uint8_t *mem, ptrdiff_t stride, int h)
+static void prefetch_mips(const uint8_t *mem, ptrdiff_t stride, int h)
 {
     register const uint8_t *p = mem;
 

libavcodec/ppc/videodsp.c

@@ -21,7 +21,7 @@
 #include "libavutil/attributes.h"
 #include "libavcodec/videodsp.h"
 
-static void prefetch_ppc(uint8_t *mem, ptrdiff_t stride, int h)
+static void prefetch_ppc(const uint8_t *mem, ptrdiff_t stride, int h)
 {
     register const uint8_t *p = mem;
     do {

libavcodec/videodsp.c

@@ -32,7 +32,7 @@
 #include "videodsp_template.c"
 #undef BIT_DEPTH
 
-static void just_return(uint8_t *buf, ptrdiff_t stride, int h)
+static void just_return(const uint8_t *buf, ptrdiff_t stride, int h)
 {
 }
 

libavcodec/videodsp.h

@@ -72,7 +72,7 @@ typedef struct VideoDSPContext {
      * @param stride distance between two lines of buf (in bytes)
      * @param h      number of lines to prefetch
      */
-    void (*prefetch)(uint8_t *buf, ptrdiff_t stride, int h);
+    void (*prefetch)(const uint8_t *buf, ptrdiff_t stride, int h);
 } VideoDSPContext;
 
 void ff_videodsp_init(VideoDSPContext *ctx, int bpc);

libavcodec/x86/videodsp_init.c

@@ -215,7 +215,7 @@ static av_noinline void emulated_edge_mc_avx2(uint8_t *buf, const uint8_t *src,
 #endif /* HAVE_AVX2_EXTERNAL */
 #endif /* HAVE_X86ASM */
 
-void ff_prefetch_mmxext(uint8_t *buf, ptrdiff_t stride, int h);
+void ff_prefetch_mmxext(const uint8_t *buf, ptrdiff_t stride, int h);
 
 av_cold void ff_videodsp_init_x86(VideoDSPContext *ctx, int bpc)
 {