diff options
| -rw-r--r-- | libavformat/flacdec.c | 21 |
1 files changed, 18 insertions, 3 deletions
diff --git a/libavformat/flacdec.c b/libavformat/flacdec.c index 7a75527..2f4ac56 100644 --- a/libavformat/flacdec.c +++ b/libavformat/flacdec.c @@ -177,9 +177,24 @@ static int flac_read_header(AVFormatContext *s) static int flac_probe(AVProbeData *p) { - if (p->buf_size < 4 || memcmp(p->buf, "fLaC", 4)) - return 0; - return AVPROBE_SCORE_EXTENSION; + /* file header + metadata header + checked bytes of streaminfo */ + if (p->buf_size >= 4 + 4 + 13) { + int type = p->buf[4] & 0x7f; + int size = AV_RB24(p->buf + 5); + int min_block_size = AV_RB16(p->buf + 8); + int max_block_size = AV_RB16(p->buf + 10); + int sample_rate = AV_RB24(p->buf + 18) >> 4; + + if (!memcmp(p->buf, "fLaC", 4) && + type == FLAC_METADATA_TYPE_STREAMINFO && + size == FLAC_STREAMINFO_SIZE && + min_block_size >= 16 && + max_block_size >= min_block_size && + sample_rate && sample_rate <= 655350) + return AVPROBE_SCORE_MAX; + } + + return 0; } AVInputFormat ff_flac_demuxer = { |
