make arguments to ssd_int8_vs_int16() const

Originally committed as revision 9548 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavcodec/dsputil.c

@@ -3697,7 +3697,8 @@ static int vsse16_c(/*MpegEncContext*/ void *c, uint8_t *s1, uint8_t *s2, int st
     return score;
 }
 
-static int ssd_int8_vs_int16_c(int8_t *pix1, int16_t *pix2, int size){
+static int ssd_int8_vs_int16_c(const int8_t *pix1, const int16_t *pix2,
+                               int size){
     int score=0;
     int i;
     for(i=0; i<size; i++)

libavcodec/dsputil.h

@@ -200,7 +200,8 @@ typedef struct DSPContext {
     me_cmp_func ildct_cmp[5]; //only width 16 used
     me_cmp_func frame_skip_cmp[5]; //only width 8 used
 
-    int (*ssd_int8_vs_int16)(int8_t *pix1, int16_t *pix2, int size);
+    int (*ssd_int8_vs_int16)(const int8_t *pix1, const int16_t *pix2,
+                             int size);
 
     /**
      * Halfpel motion compensation with rounding (a+b+1)>>1.

libavcodec/i386/dsputil_mmx.c

@@ -1871,7 +1871,7 @@ DCT_SAD_FUNC(ssse3)
 #undef HSUM
 #undef DCT_SAD
 
-static int ssd_int8_vs_int16_mmx(int8_t *pix1, int16_t *pix2, int size){
+static int ssd_int8_vs_int16_mmx(const int8_t *pix1, const int16_t *pix2, int size){
     int sum;
     long i=size;
     asm volatile(

libavcodec/ppc/int_altivec.c

@@ -29,7 +29,8 @@
 
 #include "dsputil_altivec.h"
 
-static int ssd_int8_vs_int16_altivec(int8_t *pix1, int16_t *pix2, int size) {
+static int ssd_int8_vs_int16_altivec(const int8_t *pix1, const int16_t *pix2,
+                                     int size) {
     int i, size16;
     vector signed char vpix1;
     vector signed short vpix2, vdiff, vpix1l,vpix1h;