Keep mvd_table values of only 2 mb rows.

Originally committed as revision 22047 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavcodec/h264.c

@@ -663,6 +663,7 @@ static void free_tables(H264Context *h){
     av_freep(&h->list_counts);
 
     av_freep(&h->mb2b_xy);
+    av_freep(&h->mb2br_xy);
     av_freep(&h->mb2b8_xy);
 
     for(i = 0; i < MAX_THREADS; i++) {
@@ -765,6 +766,7 @@ int ff_h264_alloc_tables(H264Context *h){
     h->slice_table= h->slice_table_base + s->mb_stride*2 + 1;
 
     FF_ALLOCZ_OR_GOTO(h->s.avctx, h->mb2b_xy  , big_mb_num * sizeof(uint32_t), fail);
+    FF_ALLOCZ_OR_GOTO(h->s.avctx, h->mb2br_xy , big_mb_num * sizeof(uint32_t), fail);
     FF_ALLOCZ_OR_GOTO(h->s.avctx, h->mb2b8_xy , big_mb_num * sizeof(uint32_t), fail);
     for(y=0; y<s->mb_height; y++){
         for(x=0; x<s->mb_width; x++){
@@ -773,6 +775,7 @@ int ff_h264_alloc_tables(H264Context *h){
             const int b8_xy= 2*x + 2*y*h->b8_stride;
 
             h->mb2b_xy [mb_xy]= b_xy;
+            h->mb2br_xy[mb_xy]= FMO ? b_xy : (b_xy % (8*h->b_stride));
             h->mb2b8_xy[mb_xy]= b8_xy;
         }
     }
@@ -797,6 +800,7 @@ static void clone_tables(H264Context *dst, H264Context *src){
     dst->slice_table              = src->slice_table;
     dst->cbp_table                = src->cbp_table;
     dst->mb2b_xy                  = src->mb2b_xy;
+    dst->mb2br_xy                 = src->mb2br_xy;
     dst->mb2b8_xy                 = src->mb2b8_xy;
     dst->chroma_pred_mode_table   = src->chroma_pred_mode_table;
     dst->mvd_table[0]             = src->mvd_table[0];

libavcodec/h264.h

@@ -61,6 +61,8 @@
 
 #define ALLOW_NOCHROMA
 
+#define FMO 0
+
 /**
  * The maximum number of slices supported by the decoder.
  * must be a power of 2
@@ -344,6 +346,7 @@ typedef struct H264Context{
     int block_offset[2*(16+8)];
 
     uint32_t *mb2b_xy; //FIXME are these 4 a good idea?
+    uint32_t *mb2br_xy;
     uint32_t *mb2b8_xy;
     int b_stride; //FIXME use s->b4_stride
     int b8_stride;
@@ -1067,13 +1070,13 @@ static void fill_decode_caches(H264Context *h, int mb_type){
             if( CABAC ) {
                 /* XXX beurk, Load mvd */
                 if(USES_LIST(top_type, list)){
-                    const int b_xy= h->mb2b_xy[top_xy] + 3*h->b_stride;
+                    const int b_xy= h->mb2br_xy[top_xy] + 3*h->b_stride;
                     AV_COPY64(h->mvd_cache[list][scan8[0] + 0 - 1*8], h->mvd_table[list][b_xy + 0]);
                 }else{
                     AV_ZERO64(h->mvd_cache[list][scan8[0] + 0 - 1*8]);
                 }
                 if(USES_LIST(left_type[0], list)){
-                    const int b_xy= h->mb2b_xy[left_xy[0]] + 3;
+                    const int b_xy= h->mb2br_xy[left_xy[0]] + 3;
                     AV_COPY16(h->mvd_cache[list][scan8[0] - 1 + 0*8], h->mvd_table[list][b_xy + h->b_stride*left_block[0]]);
                     AV_COPY16(h->mvd_cache[list][scan8[0] - 1 + 1*8], h->mvd_table[list][b_xy + h->b_stride*left_block[1]]);
                 }else{
@@ -1081,7 +1084,7 @@ static void fill_decode_caches(H264Context *h, int mb_type){
                     AV_ZERO16(h->mvd_cache [list][scan8[0] - 1 + 1*8]);
                 }
                 if(USES_LIST(left_type[1], list)){
-                    const int b_xy= h->mb2b_xy[left_xy[1]] + 3;
+                    const int b_xy= h->mb2br_xy[left_xy[1]] + 3;
                     AV_COPY16(h->mvd_cache[list][scan8[0] - 1 + 2*8], h->mvd_table[list][b_xy + h->b_stride*left_block[2]]);
                     AV_COPY16(h->mvd_cache[list][scan8[0] - 1 + 3*8], h->mvd_table[list][b_xy + h->b_stride*left_block[3]]);
                 }else{
@@ -1421,7 +1424,7 @@ static inline void write_back_motion(H264Context *h, int mb_type){
             AV_COPY128(mv_dst + y*b_stride, mv_src + 8*y);
         }
         if( CABAC ) {
-            uint8_t (*mvd_dst)[2] = &h->mvd_table[list][b_xy];
+            uint8_t (*mvd_dst)[2] = &h->mvd_table[list][FMO ? b_xy : h->mb2br_xy[h->mb_xy]];
             uint8_t (*mvd_src)[2] = &h->mvd_cache[list][scan8[0]];
             if(IS_SKIP(mb_type))
                 fill_rectangle(mvd_dst, 4, 4, h->b_stride, 0, 2);