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avformat/mp3dec: Check for occurances of headers within frames during probing 

Fixes misdetection of zYLx.wav

Reviewed-by: Paul B Mahol <onemda@gmail.com>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Limin Wang 2019-11-08 00:16:22 +08:00 committed by Michael Niedermayer
parent e9a335150a
commit c22665ae69
1 changed files with 9 additions and 1 deletions
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10
libavformat/mp3dec.c
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@ -71,7 +71,7 @@ static int mp3_read_probe(const AVProbeData *p)
int frames, ret;
int framesizes, max_framesizes;
uint32_t header;
const uint8_t *buf, *buf0, *buf2, *end;
const uint8_t *buf, *buf0, *buf2, *buf3, *end;
buf0 = p->buf;
end = p->buf + p->buf_size - sizeof(uint32_t);
@ -86,11 +86,19 @@ static int mp3_read_probe(const AVProbeData *p)
buf2 = buf;
for (framesizes = frames = 0; buf2 < end; frames++) {
MPADecodeHeader h;
int header_emu = 0;
header = AV_RB32(buf2);
ret = avpriv_mpegaudio_decode_header(&h, header);
if (ret != 0 || end - buf2 < h.frame_size)
break;
for (buf3 = buf2 + 4; buf3 < buf2 + h.frame_size; buf3++) {
uint32_t next_sync = AV_RB32(buf3);
header_emu += (next_sync & MP3_MASK) == (header & MP3_MASK);
}
if (header_emu > 2)
break;
buf2 += h.frame_size;
framesizes += h.frame_size;
}