Hi,
On Tue, Oct 9, 2012 at 1:38 PM, Mashiat Sarker Shakkhar
<mashiat.sar...@gmail.com> wrote:
> 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 problem only affects chroma Y motion vector.
> ---
> libavcodec/vc1dec.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/libavcodec/vc1dec.c b/libavcodec/vc1dec.c
> index 42eb4a5..2683c86 100644
> --- a/libavcodec/vc1dec.c
> +++ b/libavcodec/vc1dec.c
> @@ -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) {
I'm slightly curious why this is only the case for the vertical
dimension, but not the horizontal. Is that intentional, or an
oversight?
Ronald
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