Move 3 direct MV related functions that i left out from h263.c to mpeg4video.c.

Originally committed as revision 21104 to svn://svn.ffmpeg.org/ffmpeg/trunk

1 files changed, 99 insertions, 0 deletions

diff --git a/libavcodec/mpeg4video.c b/libavcodec/mpeg4video.c
index 9fab226ba8..a647960a51 100644
--- a/libavcodec/mpeg4video.c
+++ b/libavcodec/mpeg4video.c
@@ -70,3 +70,102 @@ void ff_mpeg4_clean_buffers(MpegEncContext *s)
     s->last_mv[1][0][0]=
     s->last_mv[1][0][1]= 0;
 }
+
+#define tab_size ((signed)FF_ARRAY_ELEMS(s->direct_scale_mv[0]))
+#define tab_bias (tab_size/2)
+
+//used by mpeg4 and rv10 decoder
+void ff_mpeg4_init_direct_mv(MpegEncContext *s){
+    int i;
+    for(i=0; i<tab_size; i++){
+        s->direct_scale_mv[0][i] = (i-tab_bias)*s->pb_time/s->pp_time;
+        s->direct_scale_mv[1][i] = (i-tab_bias)*(s->pb_time-s->pp_time)/s->pp_time;
+    }
+}
+
+static inline void ff_mpeg4_set_one_direct_mv(MpegEncContext *s, int mx, int my, int i){
+    int xy= s->block_index[i];
+    uint16_t time_pp= s->pp_time;
+    uint16_t time_pb= s->pb_time;
+    int p_mx, p_my;
+
+    p_mx= s->next_picture.motion_val[0][xy][0];
+    if((unsigned)(p_mx + tab_bias) < tab_size){
+        s->mv[0][i][0] = s->direct_scale_mv[0][p_mx + tab_bias] + mx;
+        s->mv[1][i][0] = mx ? s->mv[0][i][0] - p_mx
+                            : s->direct_scale_mv[1][p_mx + tab_bias];
+    }else{
+        s->mv[0][i][0] = p_mx*time_pb/time_pp + mx;
+        s->mv[1][i][0] = mx ? s->mv[0][i][0] - p_mx
+                            : p_mx*(time_pb - time_pp)/time_pp;
+    }
+    p_my= s->next_picture.motion_val[0][xy][1];
+    if((unsigned)(p_my + tab_bias) < tab_size){
+        s->mv[0][i][1] = s->direct_scale_mv[0][p_my + tab_bias] + my;
+        s->mv[1][i][1] = my ? s->mv[0][i][1] - p_my
+                            : s->direct_scale_mv[1][p_my + tab_bias];
+    }else{
+        s->mv[0][i][1] = p_my*time_pb/time_pp + my;
+        s->mv[1][i][1] = my ? s->mv[0][i][1] - p_my
+                            : p_my*(time_pb - time_pp)/time_pp;
+    }
+}
+
+#undef tab_size
+#undef tab_bias
+
+/**
+ *
+ * @return the mb_type
+ */
+int ff_mpeg4_set_direct_mv(MpegEncContext *s, int mx, int my){
+    const int mb_index= s->mb_x + s->mb_y*s->mb_stride;
+    const int colocated_mb_type= s->next_picture.mb_type[mb_index];
+    uint16_t time_pp;
+    uint16_t time_pb;
+    int i;
+
+    //FIXME avoid divides
+    // try special case with shifts for 1 and 3 B-frames?
+
+    if(IS_8X8(colocated_mb_type)){
+        s->mv_type = MV_TYPE_8X8;
+        for(i=0; i<4; i++){
+            ff_mpeg4_set_one_direct_mv(s, mx, my, i);
+        }
+        return MB_TYPE_DIRECT2 | MB_TYPE_8x8 | MB_TYPE_L0L1;
+    } else if(IS_INTERLACED(colocated_mb_type)){
+        s->mv_type = MV_TYPE_FIELD;
+        for(i=0; i<2; i++){
+            int field_select= s->next_picture.ref_index[0][s->block_index[2*i]];
+            s->field_select[0][i]= field_select;
+            s->field_select[1][i]= i;
+            if(s->top_field_first){
+                time_pp= s->pp_field_time - field_select + i;
+                time_pb= s->pb_field_time - field_select + i;
+            }else{
+                time_pp= s->pp_field_time + field_select - i;
+                time_pb= s->pb_field_time + field_select - i;
+            }
+            s->mv[0][i][0] = s->p_field_mv_table[i][0][mb_index][0]*time_pb/time_pp + mx;
+            s->mv[0][i][1] = s->p_field_mv_table[i][0][mb_index][1]*time_pb/time_pp + my;
+            s->mv[1][i][0] = mx ? s->mv[0][i][0] - s->p_field_mv_table[i][0][mb_index][0]
+                                : s->p_field_mv_table[i][0][mb_index][0]*(time_pb - time_pp)/time_pp;
+            s->mv[1][i][1] = my ? s->mv[0][i][1] - s->p_field_mv_table[i][0][mb_index][1]
+                                : s->p_field_mv_table[i][0][mb_index][1]*(time_pb - time_pp)/time_pp;
+        }
+        return MB_TYPE_DIRECT2 | MB_TYPE_16x8 | MB_TYPE_L0L1 | MB_TYPE_INTERLACED;
+    }else{
+        ff_mpeg4_set_one_direct_mv(s, mx, my, 0);
+        s->mv[0][1][0] = s->mv[0][2][0] = s->mv[0][3][0] = s->mv[0][0][0];
+        s->mv[0][1][1] = s->mv[0][2][1] = s->mv[0][3][1] = s->mv[0][0][1];
+        s->mv[1][1][0] = s->mv[1][2][0] = s->mv[1][3][0] = s->mv[1][0][0];
+        s->mv[1][1][1] = s->mv[1][2][1] = s->mv[1][3][1] = s->mv[1][0][1];
+        if((s->avctx->workaround_bugs & FF_BUG_DIRECT_BLOCKSIZE) || !s->quarter_sample)
+            s->mv_type= MV_TYPE_16X16;
+        else
+            s->mv_type= MV_TYPE_8X8;
+        return MB_TYPE_DIRECT2 | MB_TYPE_16x16 | MB_TYPE_L0L1; //Note see prev line
+    }
+}
+