static int mpc8_read_header(AVFormatContext *s) { MPCContext *c = s->priv_data; AVIOContext *pb = s->pb; AVStream *st; int tag = 0; int64_t size, pos; c->header_pos = avio_tell(pb); if(avio_rl32(pb) != TAG_MPCK){ av_log(s, AV_LOG_ERROR, "Not a Musepack8 file\n"); while(!avio_feof(pb)){ pos = avio_tell(pb); mpc8_get_chunk_header(pb, &tag, &size); if(tag == TAG_STREAMHDR) break; mpc8_handle_chunk(s, tag, pos, size); if(tag != TAG_STREAMHDR){ av_log(s, AV_LOG_ERROR, "Stream header not found\n"); pos = avio_tell(pb); avio_skip(pb, 4); //CRC c->ver = avio_r8(pb); if(c->ver != 8){ av_log(s, AV_LOG_ERROR, "Unknown stream version %d\n", c->ver); return AVERROR_PATCHWELCOME; c->samples = ffio_read_varlen(pb); ffio_read_varlen(pb); //silence samples at the beginning st = avformat_new_stream(s, NULL); if (!st) return AVERROR(ENOMEM); st->codec->codec_type = AVMEDIA_TYPE_AUDIO; st->codec->codec_id = AV_CODEC_ID_MUSEPACK8; st->codec->bits_per_coded_sample = 16; if (ff_get_extradata(st->codec, pb, 2) < 0) return AVERROR(ENOMEM); st->codec->channels = (st->codec->extradata[1] >> 4) + 1; st->codec->sample_rate = mpc8_rate[st->codec->extradata[0] >> 5]; avpriv_set_pts_info(st, 32, 1152 << (st->codec->extradata[1]&3)*2, st->codec->sample_rate); st->start_time = 0; st->duration = c->samples / (1152 << (st->codec->extradata[1]&3)*2); size -= avio_tell(pb) - pos; if (size > 0) avio_skip(pb, size); if (pb->seekable) { int64_t pos = avio_tell(s->pb); c->apetag_start = ff_ape_parse_tag(s); avio_seek(s->pb, pos, SEEK_SET); return 0;