diff options
Diffstat (limited to 'libavformat/mpc.c')
| -rw-r--r-- | libavformat/mpc.c | 20 |
1 files changed, 13 insertions, 7 deletions
diff --git a/libavformat/mpc.c b/libavformat/mpc.c index 03aa7f0d57..ea6e3c6460 100644 --- a/libavformat/mpc.c +++ b/libavformat/mpc.c @@ -58,26 +58,32 @@ static int mpc_read_header(AVFormatContext *s, AVFormatParameters *ap) { MPCContext *c = s->priv_data; AVStream *st; - int t; + int t, ret; + int64_t pos = url_ftell(s->pb); t = get_le24(s->pb); if(t != MKTAG('M', 'P', '+', 0)){ - if(t != MKTAG('I', 'D', '3', 0)){ + uint8_t buf[ID3v2_HEADER_SIZE]; + if (url_fseek(s->pb, pos, SEEK_SET) < 0) + return -1; + ret = get_buffer(s->pb, buf, ID3v2_HEADER_SIZE); + if (ret != ID3v2_HEADER_SIZE || !ff_id3v2_match(buf)) { av_log(s, AV_LOG_ERROR, "Not a Musepack file\n"); return -1; } /* skip ID3 tags and try again */ - url_fskip(s->pb, 3); - t = get_byte(s->pb) << 21; - t |= get_byte(s->pb) << 14; - t |= get_byte(s->pb) << 7; - t |= get_byte(s->pb); + t = ff_id3v2_tag_len(buf) - ID3v2_HEADER_SIZE; av_log(s, AV_LOG_DEBUG, "Skipping %d(%X) bytes of ID3 data\n", t, t); url_fskip(s->pb, t); if(get_le24(s->pb) != MKTAG('M', 'P', '+', 0)){ av_log(s, AV_LOG_ERROR, "Not a Musepack file\n"); return -1; } + /* read ID3 tags */ + if (url_fseek(s->pb, pos, SEEK_SET) < 0) + return -1; + ff_id3v2_read(s); + get_le24(s->pb); } c->ver = get_byte(s->pb); if(c->ver != 0x07 && c->ver != 0x17){ |