chroma me fix

Originally committed as revision 3216 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavcodec/dsputil.h

@@ -204,7 +204,7 @@ typedef struct DSPContext {
      * @param line_size number of bytes in a horizontal line of block
      * @param h height
      */
-    op_pixels_func put_no_rnd_pixels_tab[2][4];
+    op_pixels_func put_no_rnd_pixels_tab[4][4];
 
     /**
      * Halfpel motion compensation with no rounding (a+b)>>1.
@@ -216,7 +216,7 @@ typedef struct DSPContext {
      * @param line_size number of bytes in a horizontal line of block
      * @param h height
      */
-    op_pixels_func avg_no_rnd_pixels_tab[2][4];
+    op_pixels_func avg_no_rnd_pixels_tab[4][4];
     
     void (*put_no_rnd_pixels_l2[2])(uint8_t *block/*align width (8 or 16)*/, const uint8_t *a/*align 1*/, const uint8_t *b/*align 1*/, int line_size, int h);
     

libavcodec/motion_est.c

@@ -238,6 +238,13 @@ static inline int get_penalty_factor(MpegEncContext *s, int type){
     }
 }
 
+static int zero_cmp(void *s, uint8_t *a, uint8_t *b, int stride, int h){
+    return 0;
+}
+
+static void zero_hpel(uint8_t *a, const uint8_t *b, int stride, int h){
+}
+
 void ff_init_me(MpegEncContext *s){
     MotionEstContext * const c= &s->me;
     c->avctx= s->avctx;
@@ -266,10 +273,11 @@ void ff_init_me(MpegEncContext *s){
             c->sub_motion_search= sad_hpel_motion_search; // 2050 vs. 2450 cycles
         else
             c->sub_motion_search= hpel_motion_search;
-        c->hpel_avg= s->dsp.avg_pixels_tab;
-        if(s->no_rounding) c->hpel_put= s->dsp.put_no_rnd_pixels_tab;
-        else               c->hpel_put= s->dsp.put_pixels_tab;
     }
+    c->hpel_avg= s->dsp.avg_pixels_tab;
+    if(s->no_rounding) c->hpel_put= s->dsp.put_no_rnd_pixels_tab;
+    else               c->hpel_put= s->dsp.put_pixels_tab;
+
     if(s->linesize){
         c->stride  = s->linesize; 
         c->uvstride= s->uvlinesize;
@@ -278,6 +286,16 @@ void ff_init_me(MpegEncContext *s){
         c->uvstride=  8*s->mb_width + 16;
     }
 
+    // 8x8 fullpel search would need a 4x4 chroma compare, which we dont have yet, and even if we had the motion estimation code doesnt expect it
+    if((c->avctx->me_cmp&FF_CMP_CHROMA) && !s->dsp.me_cmp[2]){
+        s->dsp.me_cmp[2]= zero_cmp;
+    }
+    if((c->avctx->me_sub_cmp&FF_CMP_CHROMA) && !s->dsp.me_sub_cmp[2]){
+        s->dsp.me_sub_cmp[2]= zero_cmp;
+    }
+    c->hpel_put[2][0]= c->hpel_put[2][1]=
+    c->hpel_put[2][2]= c->hpel_put[2][3]= zero_hpel;
+
     c->temp= c->scratchpad;
 }