Statistics
| Branch: | Revision:

ffmpeg / libavformat / oma.c @ e63a3628

History | View | Annotate | Download (6.58 KB)

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. 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!).
38
 *
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!
44
 */
45

    
46
#include "avformat.h"
47
#include "libavutil/intreadwrite.h"
48
#include "pcm.h"
49
#include "riff.h"
50
#include "id3v2.h"
51

    
52
#define EA3_HEADER_SIZE 96
53

    
54
enum {
55
    OMA_CODECID_ATRAC3  = 0,
56
    OMA_CODECID_ATRAC3P = 1,
57
    OMA_CODECID_MP3     = 3,
58
    OMA_CODECID_LPCM    = 4,
59
    OMA_CODECID_WMA     = 5,
60
};
61

    
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 },
66
};
67

    
68
#define ID3v2_EA3_MAGIC "ea3"
69

    
70
static int oma_read_header(AVFormatContext *s,
71
                           AVFormatParameters *ap)
72
{
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;
76
    int16_t eid;
77
    uint8_t buf[EA3_HEADER_SIZE];
78
    uint8_t *edata;
79
    AVStream *st;
80

    
81
    ff_id3v2_read(s, ID3v2_EA3_MAGIC);
82
    ret = avio_read(s->pb, buf, EA3_HEADER_SIZE);
83

    
84
    if (memcmp(buf, ((const uint8_t[]){'E', 'A', '3'}),3) || buf[4] != 0 || buf[5] != EA3_HEADER_SIZE) {
85
        av_log(s, AV_LOG_ERROR, "Couldn't find the EA3 header !\n");
86
        return -1;
87
    }
88

    
89
    eid = AV_RB16(&buf[6]);
90
    if (eid != -1 && eid != -128) {
91
        av_log(s, AV_LOG_ERROR, "Encrypted file! Eid: %d\n", eid);
92
        return -1;
93
    }
94

    
95
    codec_params = AV_RB24(&buf[33]);
96

    
97
    st = av_new_stream(s, 0);
98
    if (!st)
99
        return AVERROR(ENOMEM);
100

    
101
    st->start_time = 0;
102
    st->codec->codec_type  = AVMEDIA_TYPE_AUDIO;
103
    st->codec->codec_tag   = buf[32];
104
    st->codec->codec_id    = ff_codec_get_id(codec_oma_tags, st->codec->codec_tag);
105

    
106
    switch (buf[32]) {
107
        case OMA_CODECID_ATRAC3:
108
            samplerate = srate_tab[(codec_params >> 13) & 7]*100;
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
            st->codec->channels    = 2;
115
            st->codec->sample_rate = samplerate;
116
            st->codec->bit_rate    = st->codec->sample_rate * framesize * 8 / 1024;
117

    
118
            /* fake the atrac3 extradata (wav format, makes stream copy to wav work) */
119
            st->codec->extradata_size = 14;
120
            edata = av_mallocz(14 + FF_INPUT_BUFFER_PADDING_SIZE);
121
            if (!edata)
122
                return AVERROR(ENOMEM);
123

    
124
            st->codec->extradata = edata;
125
            AV_WL16(&edata[0],  1);             // always 1
126
            AV_WL32(&edata[2],  samplerate);    // samples rate
127
            AV_WL16(&edata[6],  jsflag);        // coding mode
128
            AV_WL16(&edata[8],  jsflag);        // coding mode
129
            AV_WL16(&edata[10], 1);             // always 1
130
            // AV_WL16(&edata[12], 0);          // always 0
131

    
132
            av_set_pts_info(st, 64, 1, st->codec->sample_rate);
133
            break;
134
        case OMA_CODECID_ATRAC3P:
135
            st->codec->channels = (codec_params >> 10) & 7;
136
            framesize = ((codec_params & 0x3FF) * 8) + 8;
137
            st->codec->sample_rate = srate_tab[(codec_params >> 13) & 7]*100;
138
            st->codec->bit_rate    = st->codec->sample_rate * framesize * 8 / 1024;
139
            av_set_pts_info(st, 64, 1, st->codec->sample_rate);
140
            av_log(s, AV_LOG_ERROR, "Unsupported codec ATRAC3+!\n");
141
            break;
142
        case OMA_CODECID_MP3:
143
            st->need_parsing = AVSTREAM_PARSE_FULL;
144
            framesize = 1024;
145
            break;
146
        default:
147
            av_log(s, AV_LOG_ERROR, "Unsupported codec %d!\n",buf[32]);
148
            return -1;
149
            break;
150
    }
151

    
152
    st->codec->block_align = framesize;
153

    
154
    return 0;
155
}
156

    
157

    
158
static int oma_read_packet(AVFormatContext *s, AVPacket *pkt)
159
{
160
    int ret = av_get_packet(s->pb, pkt, s->streams[0]->codec->block_align);
161

    
162
    pkt->stream_index = 0;
163
    if (ret <= 0)
164
        return AVERROR(EIO);
165

    
166
    return ret;
167
}
168

    
169
static int oma_read_probe(AVProbeData *p)
170
{
171
    const uint8_t *buf;
172
    unsigned tag_len = 0;
173

    
174
    buf = p->buf;
175
    /* version must be 3 and flags byte zero */
176
    if (ff_id3v2_match(buf, ID3v2_EA3_MAGIC) && buf[3] == 3 && !buf[4])
177
        tag_len = ff_id3v2_tag_len(buf);
178

    
179
    // This check cannot overflow as tag_len has at most 28 bits
180
    if (p->buf_size < tag_len + 5)
181
        return 0;
182

    
183
    buf += tag_len;
184

    
185
    if (!memcmp(buf, "EA3", 3) && !buf[4] && buf[5] == EA3_HEADER_SIZE)
186
        return AVPROBE_SCORE_MAX;
187
    else
188
        return 0;
189
}
190

    
191

    
192
AVInputFormat ff_oma_demuxer = {
193
    "oma",
194
    NULL_IF_CONFIG_SMALL("Sony OpenMG audio"),
195
    0,
196
    oma_read_probe,
197
    oma_read_header,
198
    oma_read_packet,
199
    0,
200
    pcm_read_seek,
201
    .flags= AVFMT_GENERIC_INDEX,
202
    .extensions = "oma,aa3",
203
    .codec_tag= (const AVCodecTag* const []){codec_oma_tags, 0},
204
};
205