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h264: use externally provided dimensions when they appear to be more correct. 

This is based on:
	commit 30f515091c
	Author: Mans Rullgard <mans@mansr.com>
    		h264: allow cropping to AVCodecContext.width/height

The above commit is not taken as is as its buggy (incorrect handling of
the interlaced case) and didnt apply cleanly.

Fixes ticket156

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2012-06-10 02:12:20 +02:00
parent 3275981207
commit dfaf2dd956
1 changed files with 13 additions and 3 deletions
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10
libavcodec/h264.c
View File

@ -2982,9 +2982,19 @@ static int decode_slice_header(H264Context *h, H264Context *h0)
"Cannot (re-)initialize context during parallel decoding.\n");
return -1;
}
if( FFALIGN(s->avctx->width , 16 ) == s->width
&& FFALIGN(s->avctx->height, 16*(2 - h->sps.frame_mbs_only_flag)) == s->height
&& !h->sps.crop_right && !h->sps.crop_bottom
&& (s->avctx->width != s->width || s->avctx->height && s->height)
) {
av_log(h->s.avctx, AV_LOG_DEBUG, "Using externally provided dimensions\n");
s->avctx->coded_width = s->width;
s->avctx->coded_height = s->height;
} else{
avcodec_set_dimensions(s->avctx, s->width, s->height);
s->avctx->width -= (2>>CHROMA444)*FFMIN(h->sps.crop_right, (8<<CHROMA444)-1);
s->avctx->height -= (1<<s->chroma_y_shift)*FFMIN(h->sps.crop_bottom, (16>>s->chroma_y_shift)-1) * (2 - h->sps.frame_mbs_only_flag);
}
s->avctx->sample_aspect_ratio = h->sps.sar;
av_assert0(s->avctx->sample_aspect_ratio.den);