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vc1dec: Invoke edge emulation regardless of MV precision for 1-MV chroma 

This is required due to the way VC-1 handles chroma pull-back which may end
up causing negative chroma MV for zero luma MV. Edge emulation needs to be
invoked in such cases.

This only affects vertical component of chroma motion vector.

Signed-off-by: Derek Buitenhuis <derek.buitenhuis@gmail.com>
This commit is contained in:
Mashiat Sarker Shakkhar 2012-10-09 19:38:16 +00:00 committed by Derek Buitenhuis
parent 88058d9a99
commit 7cc3c4e1d4
1 changed files with 1 additions and 1 deletions
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libavcodec/vc1dec.c
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@ -430,7 +430,7 @@ static void vc1_mc_1mv(VC1Context *v, int dir)
if (v->rangeredfrm || (v->mv_mode == MV_PMODE_INTENSITY_COMP)
|| s->h_edge_pos < 22 || v_edge_pos < 22
|| (unsigned)(src_x - s->mspel) > s->h_edge_pos - (mx&3) - 16 - s->mspel * 3
|| (unsigned)(src_y - s->mspel) > v_edge_pos - (my&3) - 16 - s->mspel * 3) {
|| (unsigned)(src_y - 1) > v_edge_pos - (my&3) - 16 - 3) {
uint8_t *uvbuf = s->edge_emu_buffer + 19 * s->linesize;
srcY -= s->mspel * (1 + s->linesize);