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
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    if(!memcmp(buf, "ea3", 3)) {
82        ea3_taglen = ((buf[6] & 0x7f) << 21) | ((buf[7] & 0x7f) << 14) | ((buf[8] & 0x7f) << 7) | (buf[9] & 0x7f);
83
84        EA3_pos = ea3_taglen + 10;
85        if (buf[5] & 0x10)
86            EA3_pos += 10;
87
88        url_fseek(s->pb, EA3_pos, SEEK_SET);
89        ret = get_buffer(s->pb, buf, EA3_HEADER_SIZE);
90        if (ret != EA3_HEADER_SIZE)
91            return -1;
92    } else {
93        ret = get_buffer(s->pb, buf + 10, EA3_HEADER_SIZE - 10);
94        EA3_pos = 0;
95    }
96
97    if (memcmp(buf, ((const uint8_t[]){'E', 'A', '3'}),3) || buf[4] != 0 || buf[5] != EA3_HEADER_SIZE) {
98        av_log(s, AV_LOG_ERROR, "Couldn't find the EA3 header !\n");
99        return -1;
100    }
101
102    eid = AV_RB16(&buf[6]);
103    if (eid != -1 && eid != -128) {
104        av_log(s, AV_LOG_ERROR, "Encrypted file! Eid: %d\n", eid);
105        return -1;
106    }
107
108    codec_params = AV_RB24(&buf[33]);
109
110    st = av_new_stream(s, 0);
111    if (!st)
112        return AVERROR(ENOMEM);
113
114    st->start_time = 0;
115    st->codec->codec_type  = AVMEDIA_TYPE_AUDIO;
116    st->codec->codec_tag   = buf[32];
117    st->codec->codec_id    = ff_codec_get_id(codec_oma_tags, st->codec->codec_tag);
118
119    switch (buf[32]) {
120        case OMA_CODECID_ATRAC3:
121            samplerate = srate_tab[(codec_params >> 13) & 7]*100;
122            if (samplerate != 44100)
123                av_log(s, AV_LOG_ERROR, "Unsupported sample rate, send sample file to developers: %d\n", samplerate);
124
125            framesize = (codec_params & 0x3FF) * 8;
126            jsflag = (codec_params >> 17) & 1; /* get stereo coding mode, 1 for joint-stereo */
127            st->codec->channels    = 2;
128            st->codec->sample_rate = samplerate;
129            st->codec->bit_rate    = st->codec->sample_rate * framesize * 8 / 1024;
130
131            /* fake the atrac3 extradata (wav format, makes stream copy to wav work) */
132            st->codec->extradata_size = 14;
133            edata = av_mallocz(14 + FF_INPUT_BUFFER_PADDING_SIZE);
134            if (!edata)
135                return AVERROR(ENOMEM);
136
137            st->codec->extradata = edata;
138            AV_WL16(&edata[0],  1);             // always 1
139            AV_WL32(&edata[2],  samplerate);    // samples rate
140            AV_WL16(&edata[6],  jsflag);        // coding mode
141            AV_WL16(&edata[8],  jsflag);        // coding mode
142            AV_WL16(&edata[10], 1);             // always 1
143            // AV_WL16(&edata[12], 0);          // always 0
144
145            av_set_pts_info(st, 64, 1, st->codec->sample_rate);
146            break;
147        case OMA_CODECID_ATRAC3P:
148            st->codec->channels = (codec_params >> 10) & 7;
149            framesize = ((codec_params & 0x3FF) * 8) + 8;
150            st->codec->sample_rate = srate_tab[(codec_params >> 13) & 7]*100;
151            st->codec->bit_rate    = st->codec->sample_rate * framesize * 8 / 1024;
152            av_set_pts_info(st, 64, 1, st->codec->sample_rate);
153            av_log(s, AV_LOG_ERROR, "Unsupported codec ATRAC3+!\n");
154            break;
155        case OMA_CODECID_MP3:
156            st->need_parsing = AVSTREAM_PARSE_FULL;
157            framesize = 1024;
158            break;
159        default:
160            av_log(s, AV_LOG_ERROR, "Unsupported codec %d!\n",buf[32]);
161            return -1;
162            break;
163    }
164
165    st->codec->block_align = framesize;
166    url_fseek(s->pb, EA3_pos + EA3_HEADER_SIZE, SEEK_SET);
167
168    return 0;
169}
170
171
172static int oma_read_packet(AVFormatContext *s, AVPacket *pkt)
173{
174    int ret = av_get_packet(s->pb, pkt, s->streams[0]->codec->block_align);
175
176    pkt->stream_index = 0;
177    if (ret <= 0)
178        return AVERROR(EIO);
179
180    return ret;
181}
182
183static int oma_read_probe(AVProbeData *p)
184{
185    if (!memcmp(p->buf, ((const uint8_t[]){'e', 'a', '3', 3, 0}), 5) ||
186        (!memcmp(p->buf, "EA3", 3) &&
187         !p->buf[4] && p->buf[5] == EA3_HEADER_SIZE))
188        return AVPROBE_SCORE_MAX;
189    else
190        return 0;
191}
192
193
194AVInputFormat oma_demuxer = {
195    "oma",
196    NULL_IF_CONFIG_SMALL("Sony OpenMG audio"),
197    0,
198    oma_read_probe,
199    oma_read_header,
200    oma_read_packet,
201    0,
202    pcm_read_seek,
203    .flags= AVFMT_GENERIC_INDEX,
204    .extensions = "oma,aa3",
205    .codec_tag= (const AVCodecTag* const []){codec_oma_tags, 0},
206};
207
208