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Improve sierravmd probe. It is still quite weak, but further improvements

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are non-obvious and probably need a large (about 1kB at least) probe buffer.

Originally committed as revision 19850 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Reimar Döffinger 2009-09-15 09:16:29 +00:00
parent 1ac9563075
commit 97e078087b
1 changed files with 7 additions and 0 deletions
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7
libavformat/sierravmd.c
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@ -61,10 +61,17 @@ typedef struct VmdDemuxContext {
static int vmd_probe(AVProbeData *p)
{
int w, h;
if (p->buf_size < 16)
return 0;
/* check if the first 2 bytes of the file contain the appropriate size
* of a VMD header chunk */
if (AV_RL16(&p->buf[0]) != VMD_HEADER_SIZE - 2)
return 0;
w = AV_RL16(&p->buf[12]);
h = AV_RL16(&p->buf[14]);
if (!w || w > 2048 || !h || h > 2048)
return 0;
/* only return half certainty since this check is a bit sketchy */
return AVPROBE_SCORE_MAX / 2;