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Code Issues Releases Activity

Skip blocks in B-frames reuse motion vectors from next reference frame.

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So if referenced blocks is 16x8, 8x16 or 8x8 partitions, skip block
will have them too.

Originally committed as revision 12987 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Kostya Shishkov 2008-04-26 13:09:36 +00:00
parent ec39f7d855
commit 86c90cc7a6
1 changed files with 32 additions and 4 deletions
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36
libavcodec/rv34.c
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@ -667,6 +667,22 @@ static void rv34_mc_2mv(RV34DecContext *r, const int block_type)
r->s.dsp.avg_h264_chroma_pixels_tab);
}
static void rv34_mc_2mv_skip(RV34DecContext *r)
{
int i, j, k;
for(j = 0; j < 2; j++)
for(i = 0; i < 2; i++){
rv34_mc(r, RV34_MB_P_8x8, i*8, j*8, i+j*r->s.b8_stride, 1, 1, 0, r->rv30,
r->rv30 ? r->s.dsp.put_rv30_tpel_pixels_tab
: r->s.dsp.put_h264_qpel_pixels_tab,
r->s.dsp.put_h264_chroma_pixels_tab);
rv34_mc(r, RV34_MB_P_8x8, i*8, j*8, i+j*r->s.b8_stride, 1, 1, 1, r->rv30,
r->rv30 ? r->s.dsp.avg_rv30_tpel_pixels_tab
: r->s.dsp.avg_h264_qpel_pixels_tab,
r->s.dsp.avg_h264_chroma_pixels_tab);
}
}
/** number of motion vectors in each macroblock type */
static const int num_mvs[RV34_MB_TYPES] = { 0, 0, 1, 4, 1, 1, 0, 0, 2, 2, 2, 1 };
@ -678,7 +694,9 @@ static int rv34_decode_mv(RV34DecContext *r, int block_type)
{
MpegEncContext *s = &r->s;
GetBitContext *gb = &s->gb;
int i;
int i, j, k;
int mv_pos = s->mb_x * 2 + s->mb_y * 2 * s->b8_stride;
int next_bt;
memset(r->dmv, 0, sizeof(r->dmv));
for(i = 0; i < num_mvs[block_type]; i++){
@ -697,9 +715,19 @@ static int rv34_decode_mv(RV34DecContext *r, int block_type)
break;
}
case RV34_MB_B_DIRECT:
rv34_pred_mv_b (r, RV34_MB_B_DIRECT, 0);
rv34_pred_mv_b (r, RV34_MB_B_DIRECT, 1);
rv34_mc_2mv (r, RV34_MB_B_DIRECT);
//surprisingly, it uses motion scheme from next reference frame
next_bt = s->next_picture_ptr->mb_type[s->mb_x + s->mb_y * s->mb_stride];
for(j = 0; j < 2; j++)
for(i = 0; i < 2; i++)
for(k = 0; k < 2; k++){
s->current_picture_ptr->motion_val[0][mv_pos + i + j*s->b8_stride][k] = (s->next_picture_ptr->motion_val[0][mv_pos + i + j*s->b8_stride][k] + 1) >> 1;
s->current_picture_ptr->motion_val[1][mv_pos + i + j*s->b8_stride][k] = -(s->next_picture_ptr->motion_val[0][mv_pos + i + j*s->b8_stride][k] >> 1);
}
if(IS_16X16(next_bt)) //we can use whole macroblock MC
rv34_mc_2mv(r, block_type);
else
rv34_mc_2mv_skip(r);
fill_rectangle(s->current_picture_ptr->motion_val[0][s->mb_x * 2 + s->mb_y * 2 * s->b8_stride], 2, 2, s->b8_stride, 0, 4);
break;
case RV34_MB_P_16x16:
case RV34_MB_P_MIX16x16: