2 * Sony OpenMG (OMA) demuxer
4 * Copyright (c) 2008 Maxim Poliakovski
5 * 2008 Benjamin Larsson
7 * This file is part of Libav.
9 * Libav is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU Lesser General Public
11 * License as published by the Free Software Foundation; either
12 * version 2.1 of the License, or (at your option) any later version.
14 * Libav is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17 * Lesser General Public License for more details.
19 * You should have received a copy of the GNU Lesser General Public
20 * License along with Libav; if not, write to the Free Software
21 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
26 * This is a demuxer for Sony OpenMG Music files
28 * Known file extensions: ".oma", "aa3"
29 * The format of such files consists of three parts:
30 * - "ea3" header carrying overall info and metadata. Except for starting with
31 * "ea" instead of "ID", it's an ID3v2 header.
32 * - "EA3" header is a Sony-specific header containing information about
33 * the OpenMG file: codec type (usually ATRAC, can also be MP3 or WMA),
34 * codec specific info (packet size, sample rate, channels and so on)
35 * and DRM related info (file encryption, content id).
36 * - Sound data organized in packets follow the EA3 header
37 * (can be encrypted using the Sony DRM!).
39 * LIMITATIONS: This version supports only plain (unencrypted) OMA files.
40 * If any DRM-protected (encrypted) file is encountered you will get the
41 * corresponding error message. Try to remove the encryption using any
42 * Sony software (for example SonicStage).
43 * CODEC SUPPORT: Only ATRAC3 codec is currently supported!
47 #include "libavutil/intreadwrite.h"
52 #define EA3_HEADER_SIZE 96
55 OMA_CODECID_ATRAC3 = 0,
56 OMA_CODECID_ATRAC3P = 1,
62 static const AVCodecTag codec_oma_tags[] = {
63 { CODEC_ID_ATRAC3, OMA_CODECID_ATRAC3 },
64 { CODEC_ID_ATRAC3P, OMA_CODECID_ATRAC3P },
65 { CODEC_ID_MP3, OMA_CODECID_MP3 },
68 #define ID3v2_EA3_MAGIC "ea3"
70 static int oma_read_header(AVFormatContext *s,
71 AVFormatParameters *ap)
73 static const uint16_t srate_tab[6] = {320,441,480,882,960,0};
74 int ret, framesize, jsflag, samplerate;
75 uint32_t codec_params;
77 uint8_t buf[EA3_HEADER_SIZE];
81 ff_id3v2_read(s, ID3v2_EA3_MAGIC);
82 ret = avio_read(s->pb, buf, EA3_HEADER_SIZE);
83 if (ret < EA3_HEADER_SIZE)
86 if (memcmp(buf, ((const uint8_t[]){'E', 'A', '3'}),3) || buf[4] != 0 || buf[5] != EA3_HEADER_SIZE) {
87 av_log(s, AV_LOG_ERROR, "Couldn't find the EA3 header !\n");
91 eid = AV_RB16(&buf[6]);
92 if (eid != -1 && eid != -128) {
93 av_log(s, AV_LOG_ERROR, "Encrypted file! Eid: %d\n", eid);
97 codec_params = AV_RB24(&buf[33]);
99 st = av_new_stream(s, 0);
101 return AVERROR(ENOMEM);
104 st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
105 st->codec->codec_tag = buf[32];
106 st->codec->codec_id = ff_codec_get_id(codec_oma_tags, st->codec->codec_tag);
109 case OMA_CODECID_ATRAC3:
110 samplerate = srate_tab[(codec_params >> 13) & 7]*100;
111 if (samplerate != 44100)
112 av_log_ask_for_sample(s, "Unsupported sample rate: %d\n",
115 framesize = (codec_params & 0x3FF) * 8;
116 jsflag = (codec_params >> 17) & 1; /* get stereo coding mode, 1 for joint-stereo */
117 st->codec->channels = 2;
118 st->codec->sample_rate = samplerate;
119 st->codec->bit_rate = st->codec->sample_rate * framesize * 8 / 1024;
121 /* fake the atrac3 extradata (wav format, makes stream copy to wav work) */
122 st->codec->extradata_size = 14;
123 edata = av_mallocz(14 + FF_INPUT_BUFFER_PADDING_SIZE);
125 return AVERROR(ENOMEM);
127 st->codec->extradata = edata;
128 AV_WL16(&edata[0], 1); // always 1
129 AV_WL32(&edata[2], samplerate); // samples rate
130 AV_WL16(&edata[6], jsflag); // coding mode
131 AV_WL16(&edata[8], jsflag); // coding mode
132 AV_WL16(&edata[10], 1); // always 1
133 // AV_WL16(&edata[12], 0); // always 0
135 av_set_pts_info(st, 64, 1, st->codec->sample_rate);
137 case OMA_CODECID_ATRAC3P:
138 st->codec->channels = (codec_params >> 10) & 7;
139 framesize = ((codec_params & 0x3FF) * 8) + 8;
140 st->codec->sample_rate = srate_tab[(codec_params >> 13) & 7]*100;
141 st->codec->bit_rate = st->codec->sample_rate * framesize * 8 / 1024;
142 av_set_pts_info(st, 64, 1, st->codec->sample_rate);
143 av_log(s, AV_LOG_ERROR, "Unsupported codec ATRAC3+!\n");
145 case OMA_CODECID_MP3:
146 st->need_parsing = AVSTREAM_PARSE_FULL;
150 av_log(s, AV_LOG_ERROR, "Unsupported codec %d!\n",buf[32]);
154 st->codec->block_align = framesize;
160 static int oma_read_packet(AVFormatContext *s, AVPacket *pkt)
162 int ret = av_get_packet(s->pb, pkt, s->streams[0]->codec->block_align);
164 pkt->stream_index = 0;
171 static int oma_read_probe(AVProbeData *p)
174 unsigned tag_len = 0;
177 /* version must be 3 and flags byte zero */
178 if (ff_id3v2_match(buf, ID3v2_EA3_MAGIC) && buf[3] == 3 && !buf[4])
179 tag_len = ff_id3v2_tag_len(buf);
181 // This check cannot overflow as tag_len has at most 28 bits
182 if (p->buf_size < tag_len + 5)
187 if (!memcmp(buf, "EA3", 3) && !buf[4] && buf[5] == EA3_HEADER_SIZE)
188 return AVPROBE_SCORE_MAX;
194 AVInputFormat ff_oma_demuxer = {
196 .long_name = NULL_IF_CONFIG_SMALL("Sony OpenMG audio"),
197 .read_probe = oma_read_probe,
198 .read_header = oma_read_header,
199 .read_packet = oma_read_packet,
200 .read_seek = pcm_read_seek,
201 .flags= AVFMT_GENERIC_INDEX,
202 .extensions = "oma,aa3",
203 .codec_tag= (const AVCodecTag* const []){codec_oma_tags, 0},