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/*
* Sony OpenMG (OMA) demuxer
*
* Copyright (c) 2008 Maxim Poliakovski
* 2008 Benjamin Larsson
*
* This file is part of FFmpeg.
*
* FFmpeg 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.
*
* FFmpeg 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 FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/**
* @file libavformat/oma.c
* 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.
* - "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 "raw.h"
#include "riff.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 },
};
static int oma_read_header(AVFormatContext *s,
AVFormatParameters *ap)
{
static const uint16_t srate_tab[6] = {320,441,480,882,960,0};
int ret, ea3_taglen, EA3_pos, framesize, jsflag, samplerate;
uint32_t codec_params;
int16_t eid;
uint8_t buf[EA3_HEADER_SIZE];
uint8_t *edata;
AVStream *st;
ret = get_buffer(s->pb, buf, 10);
if (ret != 10)
return -1;
ea3_taglen = ((buf[6] & 0x7f) << 21) | ((buf[7] & 0x7f) << 14) | ((buf[8] & 0x7f) << 7) | (buf[9] & 0x7f);
EA3_pos = ea3_taglen + 10;
if (buf[5] & 0x10)
EA3_pos += 10;
url_fseek(s->pb, EA3_pos, SEEK_SET);
ret = get_buffer(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 = CODEC_TYPE_AUDIO;
st->codec->codec_tag = buf[32];
st->codec->codec_id = 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(s, AV_LOG_ERROR, "Unsupported sample rate, send sample file to developers: %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;
break;
}
st->codec->block_align = framesize;
url_fseek(s->pb, EA3_pos + EA3_HEADER_SIZE, SEEK_SET);
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)
{
if (!memcmp(p->buf, (const uint8_t[]){'e', 'a', '3', 3, 0},5))
return AVPROBE_SCORE_MAX;
else
return 0;
}
AVInputFormat oma_demuxer = {
"oma",
NULL_IF_CONFIG_SMALL("Sony OpenMG audio"),
0,
oma_read_probe,
oma_read_header,
oma_read_packet,
0,
pcm_read_seek,
.flags= AVFMT_GENERIC_INDEX,
.extensions = "oma,aa3",
.codec_tag= (const AVCodecTag* const []){codec_oma_tags, 0},
};
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