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pngdec: read sample aspect ratio 

Signed-off-by: Paul B Mahol <onemda@gmail.com>
This commit is contained in:
Paul B Mahol 2012-10-13 08:38:02 +00:00
parent 2a56e65c3b
commit 8288c2b6cb
1 changed files with 12 additions and 0 deletions
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12
libavcodec/pngdec.c
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@ -467,6 +467,18 @@ static int decode_frame(AVCodecContext *avctx,
s->width, s->height, s->bit_depth, s->color_type,
s->compression_type, s->filter_type, s->interlace_type);
break;
case MKTAG('p', 'H', 'Y', 's'):
if (s->state & PNG_IDAT) {
av_log(avctx, AV_LOG_ERROR, "pHYs after IDAT\n");
goto fail;
}
avctx->sample_aspect_ratio.num = bytestream2_get_be32(&s->gb);
avctx->sample_aspect_ratio.den = bytestream2_get_be32(&s->gb);
if (avctx->sample_aspect_ratio.num < 0 || avctx->sample_aspect_ratio.den < 0)
avctx->sample_aspect_ratio = (AVRational){ 0, 1 };
bytestream2_skip(&s->gb, 1); /* unit specifier */
bytestream2_skip(&s->gb, 4); /* crc */
break;
case MKTAG('I', 'D', 'A', 'T'):
if (!(s->state & PNG_IHDR)) {
av_log(avctx, AV_LOG_ERROR, "IDAT without IHDR\n");