static int xvag_read_header(AVFormatContext *s) { unsigned offset, big_endian, codec; AVStream *st; avio_skip(s->pb, 4); st = avformat_new_stream(s, NULL); if (!st) return AVERROR(ENOMEM); st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO; offset = avio_rl32(s->pb); big_endian = offset > av_bswap32(offset); if (big_endian) { offset = av_bswap32(offset); avio_skip(s->pb, 28); codec = avio_rb32(s->pb); st->codecpar->channels = avio_rb32(s->pb); avio_skip(s->pb, 4); st->duration = avio_rb32(s->pb); avio_skip(s->pb, 8); st->codecpar->sample_rate = avio_rb32(s->pb); } else { avio_skip(s->pb, 28); codec = avio_rl32(s->pb); st->codecpar->channels = avio_rl32(s->pb); avio_skip(s->pb, 4); st->duration = avio_rl32(s->pb); avio_skip(s->pb, 8); st->codecpar->sample_rate = avio_rl32(s->pb); } if (st->codecpar->sample_rate <= 0) return AVERROR_INVALIDDATA; if (st->codecpar->channels <= 0) return AVERROR_INVALIDDATA; switch (codec) { case 0x1c: st->codecpar->codec_id = AV_CODEC_ID_ADPCM_PSX; st->codecpar->block_align = 16 * st->codecpar->channels; break; default: avpriv_request_sample(s, "codec %X", codec); return AVERROR_PATCHWELCOME; }; avio_skip(s->pb, offset - avio_tell(s->pb)); if (avio_rb16(s->pb) == 0xFFFB) { st->codecpar->codec_id = AV_CODEC_ID_MP3; st->codecpar->block_align = 0x1000; st->need_parsing = AVSTREAM_PARSE_FULL_RAW; } avio_skip(s->pb, -2); avpriv_set_pts_info(st, 64, 1, st->codecpar->sample_rate); return 0; }