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h264: allow cropping to AVCodecContext.width/height 

Override the frame size from the SPS with AVCodecContext values
if the latter specify a size smaller by less than one macroblock.
This is required for correct cropping of MOV files from Canon cameras.

Signed-off-by: Mans Rullgard <mans@mansr.com>
This commit is contained in:
Mans Rullgard 2012-05-30 04:04:54 +01:00
parent 8aa93e9004
commit 30f515091c
1 changed files with 6 additions and 0 deletions
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6
libavcodec/h264.c
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@ -2968,6 +2968,12 @@ static int decode_slice_header(H264Context *h, H264Context *h0)
else
s->height = 16 * s->mb_height - (2 << s->chroma_y_shift) * FFMIN(h->sps.crop_bottom, (16 >> s->chroma_y_shift) - 1);
if (FFALIGN(s->avctx->width, 16) == s->width &&
FFALIGN(s->avctx->height, 16) == s->height) {
s->width = s->avctx->width;
s->height = s->avctx->height;
}
if (s->context_initialized &&
(s->width != s->avctx->width || s->height != s->avctx->height ||
av_cmp_q(h->sps.sar, s->avctx->sample_aspect_ratio))) {