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avformat/idcin: check the decompressed frame size during probing 

Fixes probetest failure

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2013-11-08 15:03:21 +01:00
parent 019247bdc3
commit 4c439f6e39
1 changed files with 14 additions and 5 deletions
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19
libavformat/idcin.c
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@ -94,6 +94,8 @@ typedef struct IdcinDemuxContext {
static int idcin_probe(AVProbeData *p)
{
unsigned int number, sample_rate;
unsigned int w, h;
int i;
/*
* This is what you could call a "probabilistic" file check: id CIN
@ -108,17 +110,17 @@ static int idcin_probe(AVProbeData *p)
/* check we have enough data to do all checks, otherwise the
0-padding may cause a wrong recognition */
if (p->buf_size < 20)
if (p->buf_size < 20 + HUFFMAN_TABLE_SIZE + 12)
return 0;
/* check the video width */
number = AV_RL32(&p->buf[0]);
if ((number == 0) || (number > 1024))
w = AV_RL32(&p->buf[0]);
if ((w == 0) || (w > 1024))
return 0;
/* check the video height */
number = AV_RL32(&p->buf[4]);
if ((number == 0) || (number > 1024))
h = AV_RL32(&p->buf[4]);
if ((h == 0) || (h > 1024))
return 0;
/* check the audio sample rate */
@ -136,6 +138,13 @@ static int idcin_probe(AVProbeData *p)
if (number > 2 || sample_rate && !number)
return 0;
i = 20 + HUFFMAN_TABLE_SIZE;
if (AV_RL32(&p->buf[i]) == 1)
i += 768;
if (i+12 > p->buf_size || AV_RL32(&p->buf[i+8]) != w*h)
return 1;
/* return half certainty since this check is a bit sketchy */
return AVPROBE_SCORE_EXTENSION;
}