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 libavformat/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 52enum { 53 OMA_CODECID_ATRAC3 = 0, 54 OMA_CODECID_ATRAC3P = 1, 55 OMA_CODECID_MP3 = 3, 56 OMA_CODECID_LPCM = 4, 57 OMA_CODECID_WMA = 5, 58}; 59 60static const AVCodecTag codec_oma_tags[] = { 61 { CODEC_ID_ATRAC3, OMA_CODECID_ATRAC3 }, 62 { CODEC_ID_ATRAC3P, OMA_CODECID_ATRAC3P }, 63 { CODEC_ID_MP3, OMA_CODECID_MP3 }, 64}; 65 66static int oma_read_header(AVFormatContext *s, 67 AVFormatParameters *ap) 68{ 69 static const uint16_t srate_tab[6] = {320,441,480,882,960,0}; 70 int ret, ea3_taglen, EA3_pos, framesize, jsflag, samplerate; 71 uint32_t codec_params; 72 int16_t eid; 73 uint8_t buf[EA3_HEADER_SIZE]; 74 uint8_t *edata; 75 AVStream *st; 76 77 ret = get_buffer(s->pb, buf, 10); 78 if (ret != 10) 79 return -1; 80 81 ea3_taglen = ((buf[6] & 0x7f) << 21) | ((buf[7] & 0x7f) << 14) | ((buf[8] & 0x7f) << 7) | (buf[9] & 0x7f); 82 83 EA3_pos = ea3_taglen + 10; 84 if (buf[5] & 0x10) 85 EA3_pos += 10; 86 87 url_fseek(s->pb, EA3_pos, SEEK_SET); 88 ret = get_buffer(s->pb, buf, EA3_HEADER_SIZE); 89 if (ret != EA3_HEADER_SIZE) 90 return -1; 91 92 if (memcmp(buf, (const uint8_t[]){'E', 'A', '3'},3) || buf[4] != 0 || buf[5] != EA3_HEADER_SIZE) { 93 av_log(s, AV_LOG_ERROR, "Couldn't find the EA3 header !\n"); 94 return -1; 95 } 96 97 eid = AV_RB16(&buf[6]); 98 if (eid != -1 && eid != -128) { 99 av_log(s, AV_LOG_ERROR, "Encrypted file! Eid: %d\n", eid); 100 return -1; 101 } 102 103 codec_params = AV_RB24(&buf[33]); 104 105 st = av_new_stream(s, 0); 106 if (!st) 107 return AVERROR(ENOMEM); 108 109 st->start_time = 0; 110 st->codec->codec_type = CODEC_TYPE_AUDIO; 111 st->codec->codec_tag = buf[32]; 112 st->codec->codec_id = codec_get_id(codec_oma_tags, st->codec->codec_tag); 113 114 switch (buf[32]) { 115 case OMA_CODECID_ATRAC3: 116 samplerate = srate_tab[(codec_params >> 13) & 7]*100; 117 if (samplerate != 44100) 118 av_log(s, AV_LOG_ERROR, "Unsupported sample rate, send sample file to developers: %d\n", samplerate); 119 120 framesize = (codec_params & 0x3FF) * 8; 121 jsflag = (codec_params >> 17) & 1; /* get stereo coding mode, 1 for joint-stereo */ 122 st->codec->channels = 2; 123 st->codec->sample_rate = samplerate; 124 st->codec->bit_rate = st->codec->sample_rate * framesize * 8 / 1024; 125 126 /* fake the atrac3 extradata (wav format, makes stream copy to wav work) */ 127 st->codec->extradata_size = 14; 128 edata = av_mallocz(14 + FF_INPUT_BUFFER_PADDING_SIZE); 129 if (!edata) 130 return AVERROR(ENOMEM); 131 132 st->codec->extradata = edata; 133 AV_WL16(&edata[0], 1); // always 1 134 AV_WL32(&edata[2], samplerate); // samples rate 135 AV_WL16(&edata[6], jsflag); // coding mode 136 AV_WL16(&edata[8], jsflag); // coding mode 137 AV_WL16(&edata[10], 1); // always 1 138 // AV_WL16(&edata[12], 0); // always 0 139 140 av_set_pts_info(st, 64, 1, st->codec->sample_rate); 141 break; 142 case OMA_CODECID_ATRAC3P: 143 st->codec->channels = (codec_params >> 10) & 7; 144 framesize = ((codec_params & 0x3FF) * 8) + 8; 145 st->codec->sample_rate = srate_tab[(codec_params >> 13) & 7]*100; 146 st->codec->bit_rate = st->codec->sample_rate * framesize * 8 / 1024; 147 av_set_pts_info(st, 64, 1, st->codec->sample_rate); 148 av_log(s, AV_LOG_ERROR, "Unsupported codec ATRAC3+!\n"); 149 break; 150 case OMA_CODECID_MP3: 151 st->need_parsing = AVSTREAM_PARSE_FULL; 152 framesize = 1024; 153 break; 154 default: 155 av_log(s, AV_LOG_ERROR, "Unsupported codec %d!\n",buf[32]); 156 return -1; 157 break; 158 } 159 160 st->codec->block_align = framesize; 161 url_fseek(s->pb, EA3_pos + EA3_HEADER_SIZE, SEEK_SET); 162 163 return 0; 164} 165 166 167static int oma_read_packet(AVFormatContext *s, AVPacket *pkt) 168{ 169 int ret = av_get_packet(s->pb, pkt, s->streams[0]->codec->block_align); 170 171 pkt->stream_index = 0; 172 if (ret <= 0) 173 return AVERROR(EIO); 174 175 return ret; 176} 177 178static int oma_read_probe(AVProbeData *p) 179{ 180 if (!memcmp(p->buf, (const uint8_t[]){'e', 'a', '3', 3, 0},5)) 181 return AVPROBE_SCORE_MAX; 182 else 183 return 0; 184} 185 186 187AVInputFormat oma_demuxer = { 188 "oma", 189 NULL_IF_CONFIG_SMALL("Sony OpenMG audio"), 190 0, 191 oma_read_probe, 192 oma_read_header, 193 oma_read_packet, 194 0, 195 pcm_read_seek, 196 .flags= AVFMT_GENERIC_INDEX, 197 .extensions = "oma,aa3", 198 .codec_tag= (const AVCodecTag* const []){codec_oma_tags, 0}, 199}; 200 201