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avformat/dv: consider a header match at byte 0 to count as detection of dv in probe

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This reduces the amount of data needed to identify dv

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2013-11-09 17:31:35 +01:00
parent e624df5dc3
commit ef8f293472
1 changed files with 6 additions and 2 deletions
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8
libavformat/dv.c
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@ -585,6 +585,7 @@ static int dv_probe(AVProbeData *p)
unsigned state, marker_pos = 0;
int i;
int matches = 0;
int firstmatch = 0;
int secondary_matches = 0;
if (p->buf_size < 5)
@ -597,8 +598,11 @@ static int dv_probe(AVProbeData *p)
// should appear around every 12000 bytes, at least 10 per frame
if ((state & 0xff07ff7f) == 0x1f07003f) {
secondary_matches++;
if ((state & 0xffffff7f) == 0x1f07003f)
if ((state & 0xffffff7f) == 0x1f07003f) {
matches++;
if (!i)
firstmatch = 1;
}
}
if (state == 0x003f0700 || state == 0xff3f0700)
marker_pos = i;
@ -608,7 +612,7 @@ static int dv_probe(AVProbeData *p)
}
if (matches && p->buf_size / matches < 1024 * 1024) {
if (matches > 4 ||
if (matches > 4 || firstmatch ||
(secondary_matches >= 10 &&
p->buf_size / secondary_matches < 24000))
// not max to avoid dv in mov to match