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lavf/vc1dec: Reduce probe score for streams with invalid frames.

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Fixes ticket #7853.
This commit is contained in:
Carl Eugen Hoyos 2019-04-19 14:06:29 +02:00
parent 53064e134c
commit 32215b2140
1 changed files with 9 additions and 4 deletions
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13
libavformat/vc1dec.c
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@ -26,7 +26,7 @@
static int vc1_probe(const AVProbeData *p)
{
int seq = 0, entry = 0, frame = 0, i;
int seq = 0, entry = 0, invalid = 0, frame = 0, i;
for (i = 0; i < p->buf_size + 5; i++) {
uint32_t code = AV_RB32(p->buf + i);
@ -39,16 +39,19 @@ static int vc1_probe(const AVProbeData *p)
profile = (p->buf[i] & 0xc0) >> 6;
if (profile != PROFILE_ADVANCED) {
seq = 0;
invalid++;
continue;
}
level = (p->buf[i] & 0x38) >> 3;
if (level >= 5) {
seq = 0;
invalid++;
continue;
}
chromaformat = (p->buf[i] & 0x6) >> 1;
if (chromaformat != 1) {
seq = 0;
invalid++;
continue;
}
seq++;
@ -56,8 +59,10 @@ static int vc1_probe(const AVProbeData *p)
break;
}
case VC1_CODE_ENTRYPOINT:
if (!seq)
if (!seq) {
invalid++;
continue;
}
entry++;
i += 2;
break;
@ -71,9 +76,9 @@ static int vc1_probe(const AVProbeData *p)
}
}
if (frame > 1)
if (frame > 1 && frame >> 1 > invalid)
return AVPROBE_SCORE_EXTENSION / 2 + 1;
if (frame == 1)
if (frame >= 1)
return AVPROBE_SCORE_EXTENSION / 4;
return 0;
}