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vp9: error out if chroma subsampling changes between frames.

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This can happen after an intra-only frame. For reference, see:
https://groups.google.com/a/webmproject.org/forum/#!msg/webm-discuss/zaoTxREZjq8/v5Enht87AhcJ

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Ronald S. Bultje 2015-05-05 08:26:50 -04:00 committed by Michael Niedermayer
parent 9d4fdfe24c
commit ed68fccf76
1 changed files with 8 additions and 1 deletions
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9
libavcodec/vp9.c
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@ -31,6 +31,7 @@
#include "vp9data.h"
#include "vp9dsp.h"
#include "libavutil/avassert.h"
#include "libavutil/pixdesc.h"
#define VP9_SYNCCODE 0x498342
@ -641,7 +642,13 @@ static int decode_frame_header(AVCodecContext *ctx,
AVFrame *ref = s->refs[s->refidx[i]].f;
int refw = ref->width, refh = ref->height;
if (refw == w && refh == h) {
if (ref->format != fmt) {
av_log(ctx, AV_LOG_ERROR,
"Ref pixfmt (%s) did not match current frame (%s)",
av_get_pix_fmt_name(ref->format),
av_get_pix_fmt_name(fmt));
return AVERROR_INVALIDDATA;
} else if (refw == w && refh == h) {
s->mvscale[i][0] = s->mvscale[i][1] = 0;
} else {
if (w * 2 < refw || h * 2 < refh || w > 16 * refw || h > 16 * refh) {