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avformat/mov: factor size out of probe code 

Reviewed-by: Paul B Mahol <onemda@gmail.com>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2021-02-06 18:22:54 +01:00
parent 5552ceaf56
commit 2c60eb6c5a
1 changed files with 8 additions and 6 deletions
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14
libavformat/mov.c
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@ -7108,9 +7108,11 @@ static int mov_probe(const AVProbeData *p)
/* check file header */
offset = 0;
for (;;) {
int64_t size;
/* ignore invalid offset */
if ((offset + 8) > (unsigned int)p->buf_size)
break;
size = AV_RB32(p->buf + offset);
tag = AV_RL32(p->buf + offset + 4);
switch(tag) {
/* check for obvious tags */
@ -7120,8 +7122,8 @@ static int mov_probe(const AVProbeData *p)
case MKTAG('p','n','o','t'): /* detect movs with preview pics like ew.mov and april.mov */
case MKTAG('u','d','t','a'): /* Packet Video PVAuthor adds this and a lot of more junk */
case MKTAG('f','t','y','p'):
if (AV_RB32(p->buf+offset) < 8 &&
(AV_RB32(p->buf+offset) != 1 ||
if (size < 8 &&
(size != 1 ||
offset + 12 > (unsigned int)p->buf_size ||
AV_RB64(p->buf+offset + 8) == 0)) {
score = FFMAX(score, AVPROBE_SCORE_EXTENSION);
@ -7133,7 +7135,7 @@ static int mov_probe(const AVProbeData *p)
} else {
score = AVPROBE_SCORE_MAX;
}
offset = FFMAX(4, AV_RB32(p->buf+offset)) + offset;
offset = FFMAX(4, size) + offset;
break;
/* those are more common words, so rate then a bit less */
case MKTAG('e','d','i','w'): /* xdcam files have reverted first tags */
@ -7142,7 +7144,7 @@ static int mov_probe(const AVProbeData *p)
case MKTAG('j','u','n','k'):
case MKTAG('p','i','c','t'):
score = FFMAX(score, AVPROBE_SCORE_MAX - 5);
offset = FFMAX(4, AV_RB32(p->buf+offset)) + offset;
offset = FFMAX(4, size) + offset;
break;
case MKTAG(0x82,0x82,0x7f,0x7d):
case MKTAG('s','k','i','p'):
@ -7150,10 +7152,10 @@ static int mov_probe(const AVProbeData *p)
case MKTAG('p','r','f','l'):
/* if we only find those cause probedata is too small at least rate them */
score = FFMAX(score, AVPROBE_SCORE_EXTENSION);
offset = FFMAX(4, AV_RB32(p->buf+offset)) + offset;
offset = FFMAX(4, size) + offset;
break;
default:
offset = FFMAX(4, AV_RB32(p->buf+offset)) + offset;
offset = FFMAX(4, size) + offset;
}
}
if (score > AVPROBE_SCORE_MAX - 50 && moov_offset != -1) {