static int mp3_read_header(AVFormatContext *s, AVFormatParameters *ap) { AVStream *st; int64_t off; st = avformat_new_stream(s, NULL); if (!st) return AVERROR(ENOMEM); st->codec->codec_type = AVMEDIA_TYPE_AUDIO; st->codec->codec_id = CODEC_ID_MP3; st->need_parsing = AVSTREAM_PARSE_FULL; st->start_time = 0; // lcm of all mp3 sample rates av_set_pts_info(st, 64, 1, 14112000); off = avio_tell(s->pb); if (!av_dict_get(s->metadata, "", NULL, AV_DICT_IGNORE_SUFFIX)) ff_id3v1_read(s); if (mp3_parse_vbr_tags(s, st, off) < 0) avio_seek(s->pb, off, SEEK_SET); /* the parameters will be extracted from the compressed bitstream */ return 0; }
static int mp3_read_header(AVFormatContext *s, AVFormatParameters *ap) { AVStream *st; uint8_t buf[ID3v1_TAG_SIZE]; int len, ret, filesize; offset_t off; st = av_new_stream(s, 0); if (!st) return AVERROR(ENOMEM); st->codec->codec_type = CODEC_TYPE_AUDIO; st->codec->codec_id = CODEC_ID_MP3; st->need_parsing = AVSTREAM_PARSE_FULL; st->start_time = 0; /* try to get the TAG */ if (!url_is_streamed(s->pb)) { /* XXX: change that */ filesize = url_fsize(s->pb); if (filesize > 128) { url_fseek(s->pb, filesize - 128, SEEK_SET); ret = get_buffer(s->pb, buf, ID3v1_TAG_SIZE); if (ret == ID3v1_TAG_SIZE) { id3v1_parse_tag(s, buf); } url_fseek(s->pb, 0, SEEK_SET); } } /* if ID3v2 header found, skip it */ ret = get_buffer(s->pb, buf, ID3v2_HEADER_SIZE); if (ret != ID3v2_HEADER_SIZE) return -1; if (id3v2_match(buf)) { /* parse ID3v2 header */ len = ((buf[6] & 0x7f) << 21) | ((buf[7] & 0x7f) << 14) | ((buf[8] & 0x7f) << 7) | (buf[9] & 0x7f); id3v2_parse(s, len, buf[3], buf[5]); } else { url_fseek(s->pb, 0, SEEK_SET); } off = url_ftell(s->pb); mp3_parse_vbr_tags(s, st, off); url_fseek(s->pb, off, SEEK_SET); /* the parameters will be extracted from the compressed bitstream */ return 0; }