/* * Sony OpenMG (OMA) demuxer * * Copyright (c) 2008 Maxim Poliakovski * 2008 Benjamin Larsson * * This file is part of Libav. * * Libav is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2.1 of the License, or (at your option) any later version. * * Libav is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with Libav; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ /** * @file * This is a demuxer for Sony OpenMG Music files * * Known file extensions: ".oma", "aa3" * The format of such files consists of three parts: * - "ea3" header carrying overall info and metadata. Except for starting with * "ea" instead of "ID", it's an ID3v2 header. * - "EA3" header is a Sony-specific header containing information about * the OpenMG file: codec type (usually ATRAC, can also be MP3 or WMA), * codec specific info (packet size, sample rate, channels and so on) * and DRM related info (file encryption, content id). * - Sound data organized in packets follow the EA3 header * (can be encrypted using the Sony DRM!). * * LIMITATIONS: This version supports only plain (unencrypted) OMA files. * If any DRM-protected (encrypted) file is encountered you will get the * corresponding error message. Try to remove the encryption using any * Sony software (for example SonicStage). * CODEC SUPPORT: Only ATRAC3 codec is currently supported! */ #include "avformat.h" #include "libavutil/intreadwrite.h" #include "pcm.h" #include "riff.h" #include "id3v2.h" #define EA3_HEADER_SIZE 96 enum { OMA_CODECID_ATRAC3 = 0, OMA_CODECID_ATRAC3P = 1, OMA_CODECID_MP3 = 3, OMA_CODECID_LPCM = 4, OMA_CODECID_WMA = 5, }; static const AVCodecTag codec_oma_tags[] = { { CODEC_ID_ATRAC3, OMA_CODECID_ATRAC3 }, { CODEC_ID_ATRAC3P, OMA_CODECID_ATRAC3P }, { CODEC_ID_MP3, OMA_CODECID_MP3 }, }; #define ID3v2_EA3_MAGIC "ea3" static int oma_read_header(AVFormatContext *s, AVFormatParameters *ap) { static const uint16_t srate_tab[6] = {320,441,480,882,960,0}; int ret, framesize, jsflag, samplerate; uint32_t codec_params; int16_t eid; uint8_t buf[EA3_HEADER_SIZE]; uint8_t *edata; AVStream *st; ff_id3v2_read(s, ID3v2_EA3_MAGIC); ret = avio_read(s->pb, buf, EA3_HEADER_SIZE); if (ret < EA3_HEADER_SIZE) return -1; if (memcmp(buf, ((const uint8_t[]){'E', 'A', '3'}),3) || buf[4] != 0 || buf[5] != EA3_HEADER_SIZE) { av_log(s, AV_LOG_ERROR, "Couldn't find the EA3 header !\n"); return -1; } eid = AV_RB16(&buf[6]); if (eid != -1 && eid != -128) { av_log(s, AV_LOG_ERROR, "Encrypted file! Eid: %d\n", eid); return -1; } codec_params = AV_RB24(&buf[33]); st = av_new_stream(s, 0); if (!st) return AVERROR(ENOMEM); st->start_time = 0; st->codec->codec_type = AVMEDIA_TYPE_AUDIO; st->codec->codec_tag = buf[32]; st->codec->codec_id = ff_codec_get_id(codec_oma_tags, st->codec->codec_tag); switch (buf[32]) { case OMA_CODECID_ATRAC3: samplerate = srate_tab[(codec_params >> 13) & 7]*100; if (samplerate != 44100) av_log_ask_for_sample(s, "Unsupported sample rate: %d\n", samplerate); framesize = (codec_params & 0x3FF) * 8; jsflag = (codec_params >> 17) & 1; /* get stereo coding mode, 1 for joint-stereo */ st->codec->channels = 2; st->codec->sample_rate = samplerate; st->codec->bit_rate = st->codec->sample_rate * framesize * 8 / 1024; /* fake the atrac3 extradata (wav format, makes stream copy to wav work) */ st->codec->extradata_size = 14; edata = av_mallocz(14 + FF_INPUT_BUFFER_PADDING_SIZE); if (!edata) return AVERROR(ENOMEM); st->codec->extradata = edata; AV_WL16(&edata[0], 1); // always 1 AV_WL32(&edata[2], samplerate); // samples rate AV_WL16(&edata[6], jsflag); // coding mode AV_WL16(&edata[8], jsflag); // coding mode AV_WL16(&edata[10], 1); // always 1 // AV_WL16(&edata[12], 0); // always 0 av_set_pts_info(st, 64, 1, st->codec->sample_rate); break; case OMA_CODECID_ATRAC3P: st->codec->channels = (codec_params >> 10) & 7; framesize = ((codec_params & 0x3FF) * 8) + 8; st->codec->sample_rate = srate_tab[(codec_params >> 13) & 7]*100; st->codec->bit_rate = st->codec->sample_rate * framesize * 8 / 1024; av_set_pts_info(st, 64, 1, st->codec->sample_rate); av_log(s, AV_LOG_ERROR, "Unsupported codec ATRAC3+!\n"); break; case OMA_CODECID_MP3: st->need_parsing = AVSTREAM_PARSE_FULL; framesize = 1024; break; default: av_log(s, AV_LOG_ERROR, "Unsupported codec %d!\n",buf[32]); return -1; } st->codec->block_align = framesize; return 0; } static int oma_read_packet(AVFormatContext *s, AVPacket *pkt) { int ret = av_get_packet(s->pb, pkt, s->streams[0]->codec->block_align); pkt->stream_index = 0; if (ret <= 0) return AVERROR(EIO); return ret; } static int oma_read_probe(AVProbeData *p) { const uint8_t *buf; unsigned tag_len = 0; buf = p->buf; /* version must be 3 and flags byte zero */ if (ff_id3v2_match(buf, ID3v2_EA3_MAGIC) && buf[3] == 3 && !buf[4]) tag_len = ff_id3v2_tag_len(buf); // This check cannot overflow as tag_len has at most 28 bits if (p->buf_size < tag_len + 5) return 0; buf += tag_len; if (!memcmp(buf, "EA3", 3) && !buf[4] && buf[5] == EA3_HEADER_SIZE) return AVPROBE_SCORE_MAX; else return 0; } AVInputFormat ff_oma_demuxer = { .name = "oma", .long_name = NULL_IF_CONFIG_SMALL("Sony OpenMG audio"), .read_probe = oma_read_probe, .read_header = oma_read_header, .read_packet = oma_read_packet, .read_seek = pcm_read_seek, .flags= AVFMT_GENERIC_INDEX, .extensions = "oma,aa3", .codec_tag= (const AVCodecTag* const []){codec_oma_tags, 0}, };