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Parse ID3 tags in Musepack SV7 files 

Patch by Matti Hamalainen (mhamalai@students.oamk.+358)
Thread: [PATCH] 6/6 Add parsing of ID3v2 tags in Musepack SV7 demuxer

Originally committed as revision 19631 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Matti Hamalainen 2009-08-11 17:28:56 +00:00 committed by Kostya Shishkov
parent 311f96a8cc
commit 5f71844e78
1 changed files with 13 additions and 7 deletions
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20
libavformat/mpc.c
View File

@ -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){