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avcodec/speexdec: relax the extradata check for the speex string

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There could be bogus bytes at the start, as is the case of
vp5/potter512-400-partial.avi from the FATE suite, which could be a case of bad
remuxing from an OGG source.

Partially fixes decoding of vp5/potter512-400-partial.avi

Signed-off-by: James Almer <jamrial@gmail.com>
This commit is contained in:
James Almer 2024-01-19 22:34:28 -03:00
parent 0f4a72b22b
commit cad35f0a77
1 changed files with 3 additions and 2 deletions
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5
libavcodec/speexdec.c
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@ -52,6 +52,7 @@
*/ */
#include "libavutil/avassert.h" #include "libavutil/avassert.h"
#include "libavutil/avstring.h"
#include "libavutil/float_dsp.h" #include "libavutil/float_dsp.h"
#include "avcodec.h" #include "avcodec.h"
#include "bytestream.h" #include "bytestream.h"
@ -1397,9 +1398,9 @@ static int parse_speex_extradata(AVCodecContext *avctx,
const uint8_t *extradata, int extradata_size) const uint8_t *extradata, int extradata_size)
{ {
SpeexContext *s = avctx->priv_data; SpeexContext *s = avctx->priv_data;
const uint8_t *buf = extradata; const uint8_t *buf = av_strnstr(extradata, "Speex ", extradata_size);
if (memcmp(buf, "Speex ", 8)) if (!buf)
return AVERROR_INVALIDDATA; return AVERROR_INVALIDDATA;
buf += 28; buf += 28;