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Vastly improved mm_probe function, passes probetest. 

Originally committed as revision 19851 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Reimar Döffinger 2009-09-15 09:21:29 +00:00
parent 97e078087b
commit 5837e4ca33
1 changed files with 13 additions and 1 deletions
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14
libavformat/mm.c
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@ -58,10 +58,22 @@ typedef struct {
static int mm_probe(AVProbeData *p)
{
int len, type, fps, w, h;
if (p->buf_size < MM_HEADER_LEN_AV + MM_PREAMBLE_SIZE)
return 0;
/* the first chunk is always the header */
if (AV_RL16(&p->buf[0]) != MM_TYPE_HEADER)
return 0;
if (AV_RL32(&p->buf[2]) != MM_HEADER_LEN_V && AV_RL32(&p->buf[2]) != MM_HEADER_LEN_AV)
len = AV_RL32(&p->buf[2]);
if (len != MM_HEADER_LEN_V && len != MM_HEADER_LEN_AV)
return 0;
fps = AV_RL16(&p->buf[8]);
w = AV_RL16(&p->buf[12]);
h = AV_RL16(&p->buf[14]);
if (!fps || fps > 60 || !w || w > 2048 || !h || h > 2048)
return 0;
type = AV_RL16(&p->buf[len]);
if (!type || type > 0x31)
return 0;
/* only return half certainty since this check is a bit sketchy */