flac_header (AVFormatContext * s, int idx) { struct ogg *ogg = s->priv_data; struct ogg_stream *os = ogg->streams + idx; AVStream *st = s->streams[idx]; GetBitContext gb; FLACStreaminfo si; int mdt; if (os->buf[os->pstart] == 0xff) return 0; init_get_bits(&gb, os->buf + os->pstart, os->psize*8); skip_bits1(&gb); /* metadata_last */ mdt = get_bits(&gb, 7); if (mdt == OGG_FLAC_METADATA_TYPE_STREAMINFO) { uint8_t *streaminfo_start = os->buf + os->pstart + 5 + 4 + 4 + 4; skip_bits_long(&gb, 4*8); /* "FLAC" */ if(get_bits(&gb, 8) != 1) /* unsupported major version */ return -1; skip_bits_long(&gb, 8 + 16); /* minor version + header count */ skip_bits_long(&gb, 4*8); /* "fLaC" */ /* METADATA_BLOCK_HEADER */ if (get_bits_long(&gb, 32) != FLAC_STREAMINFO_SIZE) return -1; avpriv_flac_parse_streaminfo(st->codec, &si, streaminfo_start); st->codec->codec_type = AVMEDIA_TYPE_AUDIO; st->codec->codec_id = AV_CODEC_ID_FLAC; st->need_parsing = AVSTREAM_PARSE_HEADERS; ff_alloc_extradata(st->codec, FLAC_STREAMINFO_SIZE); memcpy(st->codec->extradata, streaminfo_start, st->codec->extradata_size); avpriv_set_pts_info(st, 64, 1, st->codec->sample_rate); } else if (mdt == FLAC_METADATA_TYPE_VORBIS_COMMENT) { ff_vorbis_comment (s, &st->metadata, os->buf + os->pstart + 4, os->psize - 4); } return 1; }