typedef struct {
int64_t filesize;
+ int start_pad;
+ int end_pad;
} MP3Context;
/* mp3 read */
*/
static int mp3_parse_vbr_tags(AVFormatContext *s, AVStream *st, int64_t base)
{
+ MP3Context *mp3 = s->priv_data;
uint32_t v, spf;
unsigned frames = 0; /* Total number of frames in file */
unsigned size = 0; /* Total number of bytes in the stream */
frames = avio_rb32(s->pb);
if(v & 0x2)
size = avio_rb32(s->pb);
+ if(v & 4)
+ avio_skip(s->pb, 100);
+ if(v & 8)
+ avio_skip(s->pb, 4);
+
+ v = avio_rb32(s->pb);
+ if(v == MKBETAG('L', 'A', 'M', 'E')) {
+ avio_skip(s->pb, 21-4);
+ v= avio_rb24(s->pb);
+ mp3->start_pad = v>>12;
+ mp3-> end_pad = v&4095;
+ st->skip_samples = mp3->start_pad + 528 + 1;
+ av_log(s, AV_LOG_DEBUG, "pad %d %d\n", mp3->start_pad, mp3-> end_pad);
+ }
}
/* Check for VBRI tag (always 32 bytes after end of mpegaudio header) */
return ret;
}
+static int read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
+{
+ MP3Context *mp3 = s->priv_data;
+ AVStream *st = s->streams[stream_index];
+
+ st->skip_samples = timestamp <= 0 ? mp3->start_pad + 528 + 1 : 0;
+
+ return -1;
+}
+
AVInputFormat ff_mp3_demuxer = {
.name = "mp3",
.long_name = NULL_IF_CONFIG_SMALL("MPEG audio layer 2/3"),
.read_probe = mp3_read_probe,
.read_header = mp3_read_header,
.read_packet = mp3_read_packet,
+ .read_seek = read_seek,
.flags = AVFMT_GENERIC_INDEX,
.extensions = "mp2,mp3,m2a", /* XXX: use probe */
};