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avcodec/vc1: store zero MVs for all blocks in a MB

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Direct prediction for interlace frame B pictures references the mv in the
second block in an MB in the backward reference frame for the twomv case.
When the backward reference frame is an I frame, this value may be unset.

Signed-off-by: Jerome Borsboom <jerome.borsboom@carpalis.nl>
This commit is contained in:
Jerome Borsboom 2018-05-28 23:50:28 +02:00 committed by Carl Eugen Hoyos
parent c0402e1e30
commit 8a4dbd3e9f
1 changed files with 4 additions and 2 deletions
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6
libavcodec/vc1_block.c
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@ -2678,8 +2678,10 @@ static void vc1_decode_i_blocks_adv(VC1Context *v)
s->bdsp.clear_blocks(block[0]);
mb_pos = s->mb_x + s->mb_y * s->mb_stride;
s->current_picture.mb_type[mb_pos + v->mb_off] = MB_TYPE_INTRA;
s->current_picture.motion_val[1][s->block_index[0] + v->blocks_off][0] = 0;
s->current_picture.motion_val[1][s->block_index[0] + v->blocks_off][1] = 0;
for (int i = 0; i < 4; i++) {
s->current_picture.motion_val[1][s->block_index[i] + v->blocks_off][0] = 0;
s->current_picture.motion_val[1][s->block_index[i] + v->blocks_off][1] = 0;
}
// do actual MB decoding and displaying
if (v->fieldtx_is_raw)