libavformat/oma.c

   1 /*
   2  * Sony OpenMG (OMA) demuxer
   3  *
   4  * Copyright (c) 2008 Maxim Poliakovski
   5  *               2008 Benjamin Larsson
   6  *
   7  * This file is part of FFmpeg.
   8  *
   9  * FFmpeg 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.
  13  *
  14  * FFmpeg 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.
  18  *
  19  * You should have received a copy of the GNU Lesser General Public
  20  * License along with FFmpeg; if not, write to the Free Software
  21  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  22  */
  23
  24 /**
  25  * @file oma.c
  26  * This is a demuxer for Sony OpenMG Music files
  27  *
  28  * Known file extensions: ".oma", "aa3"
  29  * The format of such files consists of three parts:
  30  * - "ea3" header carrying overall info and metadata.
  31  * - "EA3" header is a Sony-specific header containing information about
  32  *   the OpenMG file: codec type (usually ATRAC, can also be MP3 or WMA),
  33  *   codec specific info (packet size, sample rate, channels and so on)
  34  *   and DRM related info (file encryption, content id).
  35  * - Sound data organized in packets follow the EA3 header
  36  *   (can be encrypted using the Sony DRM!).
  37  *
  38  * LIMITATIONS: This version supports only plain (unencrypted) OMA files.
  39  * If any DRM-protected (encrypted) file is encountered you will get the
  40  * corresponding error message. Try to remove the encryption using any
  41  * Sony software (for example SonicStage).
  42  * CODEC SUPPORT: Only ATRAC3 codec is currently supported!
  43  */
  44
  45 #include "avformat.h"
  46 #include "libavutil/intreadwrite.h"
  47 #include "raw.h"
  48 #include "riff.h"
  49
  50 #define EA3_HEADER_SIZE 96
  51
  52 enum {
  53     OMA_CODECID_ATRAC3  = 0,
  54     OMA_CODECID_ATRAC3P = 1,
  55 };
  56
  57 static const AVCodecTag codec_oma_tags[] = {
  58     { CODEC_ID_ATRAC3,  OMA_CODECID_ATRAC3 },
  59     { CODEC_ID_ATRAC3P, OMA_CODECID_ATRAC3P },
  60 };
  61
  62 static int oma_read_header(AVFormatContext *s,
  63                            AVFormatParameters *ap)
  64 {
  65     static const uint16_t srate_tab[6] = {320,441,480,882,960,0};
  66     int     ret, ea3_taglen, EA3_pos, framesize, jsflag, samplerate, channel_id;
  67     uint32_t codec_params;
  68     int16_t eid;
  69     uint8_t buf[EA3_HEADER_SIZE];
  70     uint8_t *edata;
  71     AVStream *st;
  72
  73     ret = get_buffer(s->pb, buf, 10);
  74     if (ret != 10)
  75         return -1;
  76
  77     ea3_taglen = ((buf[6] & 0x7f) << 21) | ((buf[7] & 0x7f) << 14) | ((buf[8] & 0x7f) << 7) | (buf[9] & 0x7f);
  78
  79     EA3_pos = ea3_taglen + 10;
  80     if (buf[5] & 0x10)
  81         EA3_pos += 10;
  82
  83     url_fseek(s->pb, EA3_pos, SEEK_SET);
  84     ret = get_buffer(s->pb, buf, EA3_HEADER_SIZE);
  85     if (ret != EA3_HEADER_SIZE)
  86         return -1;
  87
  88     if (memcmp(buf, (uint8_t[]){'E', 'A', '3'},3) || buf[4] != 0 || buf[5] != EA3_HEADER_SIZE) {
  89         av_log(s, AV_LOG_ERROR, "Couldn't find the EA3 header !\n");
  90         return -1;
  91     }
  92
  93     eid = AV_RB16(&buf[6]);
  94     if (eid != -1 && eid != -128) {
  95         av_log(s, AV_LOG_ERROR, "Encrypted file! Eid: %d\n", eid);
  96         return -1;
  97     }
  98
  99     codec_params = AV_RB24(&buf[33]);
 100     channel_id = (codec_params >> 10) & 7;
 101     samplerate = srate_tab[(codec_params >> 13) & 7]*100;
 102
 103     st = av_new_stream(s, 0);
 104     if (!st)
 105         return AVERROR(ENOMEM);
 106
 107     switch (buf[32]) {
 108         case OMA_CODECID_ATRAC3:
 109             if (samplerate != 44100)
 110                 av_log(s, AV_LOG_ERROR, "Unsupported sample rate, send sample file to developers: %d\n", samplerate);
 111
 112             framesize = (codec_params & 0x3FF) * 8;
 113             jsflag = (codec_params >> 17) & 1; /* get stereo coding mode, 1 for joint-stereo */
 114             channel_id = 2;
 115
 116             /* fake the atrac3 extradata (wav format, makes stream copy to wav work) */
 117             st->codec->extradata_size = 14;
 118             edata = av_mallocz(14 + FF_INPUT_BUFFER_PADDING_SIZE);
 119             if (!edata)
 120                 return AVERROR(ENOMEM);
 121
 122             st->codec->extradata = edata;
 123             AV_WL16(&edata[0],  1);             // always 1
 124             AV_WL32(&edata[2],  samplerate);    // samples rate
 125             AV_WL16(&edata[6],  jsflag);        // coding mode
 126             AV_WL16(&edata[8],  jsflag);        // coding mode
 127             AV_WL16(&edata[10], 1);             // always 1
 128             // AV_WL16(&edata[12], 0);          // always 0
 129             break;
 130         case OMA_CODECID_ATRAC3P:
 131             framesize = ((codec_params & 0x3FF) * 8) + 8;
 132             av_log(s, AV_LOG_ERROR, "Unsupported codec ATRAC3+!\n");
 133             break;
 134         default:
 135             av_log(s, AV_LOG_ERROR, "Unsupported codec %d!\n",buf[32]);
 136             return -1;
 137             break;
 138     }
 139
 140     st->codec->codec_type  = CODEC_TYPE_AUDIO;
 141     st->codec->codec_tag   = buf[32];
 142     st->codec->codec_id    = codec_get_id(codec_oma_tags, st->codec->codec_tag);
 143     st->codec->channels    = channel_id;
 144     st->codec->sample_rate = samplerate;
 145     st->codec->bit_rate    = samplerate * framesize * 8 / 1024;
 146     st->codec->block_align = framesize;
 147
 148     st->start_time = 0;
 149     av_set_pts_info(st, 64, 1, st->codec->sample_rate);
 150
 151     url_fseek(s->pb, EA3_pos + EA3_HEADER_SIZE, SEEK_SET);
 152
 153     return 0;
 154 }
 155
 156
 157 static int oma_read_packet(AVFormatContext *s, AVPacket *pkt)
 158 {
 159     int ret = av_get_packet(s->pb, pkt, s->streams[0]->codec->block_align);
 160
 161     pkt->stream_index = 0;
 162     if (ret <= 0)
 163         return AVERROR(EIO);
 164
 165     return ret;
 166 }
 167
 168 static int oma_read_probe(AVProbeData *p)
 169 {
 170     if (!memcmp(p->buf, (uint8_t[]){'e', 'a', '3', 3, 0},5))
 171         return AVPROBE_SCORE_MAX;
 172     else
 173         return 0;
 174 }
 175
 176
 177 AVInputFormat oma_demuxer = {
 178     "oma",
 179     NULL_IF_CONFIG_SMALL("Sony OpenMG audio"),
 180     0,
 181     oma_read_probe,
 182     oma_read_header,
 183     oma_read_packet,
 184     0,
 185     pcm_read_seek,
 186     .flags= AVFMT_GENERIC_INDEX,
 187     .extensions = "oma,aa3",
 188     .codec_tag= (const AVCodecTag*[]){codec_oma_tags, 0},
 189 };
 190