Revision d08928bb

View differences:

libavformat/Makefile
129 129
OBJS-$(CONFIG_MMF_MUXER)                 += mmf.o riff.o
130 130
OBJS-$(CONFIG_MOV_DEMUXER)               += mov.o riff.o isom.o
131 131
OBJS-$(CONFIG_MOV_MUXER)                 += movenc.o riff.o isom.o avc.o movenchint.o
132
OBJS-$(CONFIG_MP2_MUXER)                 += mp3.o
133
OBJS-$(CONFIG_MP3_DEMUXER)               += mp3.o
134
OBJS-$(CONFIG_MP3_MUXER)                 += mp3.o
132
OBJS-$(CONFIG_MP2_MUXER)                 += mp3enc.o
133
OBJS-$(CONFIG_MP3_DEMUXER)               += mp3dec.o
134
OBJS-$(CONFIG_MP3_MUXER)                 += mp3enc.o
135 135
OBJS-$(CONFIG_MPC_DEMUXER)               += mpc.o apetag.o
136 136
OBJS-$(CONFIG_MPC8_DEMUXER)              += mpc8.o
137 137
OBJS-$(CONFIG_MPEG1SYSTEM_MUXER)         += mpegenc.o
libavformat/mp3.c
1
/*
2
 * MP3 muxer and demuxer
3
 * Copyright (c) 2003 Fabrice Bellard
4
 *
5
 * This file is part of FFmpeg.
6
 *
7
 * FFmpeg is free software; you can redistribute it and/or
8
 * modify it under the terms of the GNU Lesser General Public
9
 * License as published by the Free Software Foundation; either
10
 * version 2.1 of the License, or (at your option) any later version.
11
 *
12
 * FFmpeg is distributed in the hope that it will be useful,
13
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
15
 * Lesser General Public License for more details.
16
 *
17
 * You should have received a copy of the GNU Lesser General Public
18
 * License along with FFmpeg; if not, write to the Free Software
19
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20
 */
21

  
22
#include <strings.h>
23
#include "libavutil/avstring.h"
24
#include "libavutil/intreadwrite.h"
25
#include "avformat.h"
26
#include "id3v2.h"
27
#include "id3v1.h"
28

  
29
#if CONFIG_MP3_DEMUXER
30

  
31
#include "libavcodec/mpegaudio.h"
32
#include "libavcodec/mpegaudiodecheader.h"
33

  
34
/* mp3 read */
35

  
36
static int mp3_read_probe(AVProbeData *p)
37
{
38
    int max_frames, first_frames = 0;
39
    int fsize, frames, sample_rate;
40
    uint32_t header;
41
    uint8_t *buf, *buf0, *buf2, *end;
42
    AVCodecContext avctx;
43

  
44
    buf0 = p->buf;
45
    end = p->buf + p->buf_size - sizeof(uint32_t);
46
    while(buf0 < end && !*buf0)
47
        buf0++;
48

  
49
    max_frames = 0;
50
    buf = buf0;
51

  
52
    for(; buf < end; buf= buf2+1) {
53
        buf2 = buf;
54

  
55
        for(frames = 0; buf2 < end; frames++) {
56
            header = AV_RB32(buf2);
57
            fsize = ff_mpa_decode_header(&avctx, header, &sample_rate, &sample_rate, &sample_rate, &sample_rate);
58
            if(fsize < 0)
59
                break;
60
            buf2 += fsize;
61
        }
62
        max_frames = FFMAX(max_frames, frames);
63
        if(buf == buf0)
64
            first_frames= frames;
65
    }
66
    // keep this in sync with ac3 probe, both need to avoid
67
    // issues with MPEG-files!
68
    if   (first_frames>=4) return AVPROBE_SCORE_MAX/2+1;
69
    else if(max_frames>500)return AVPROBE_SCORE_MAX/2;
70
    else if(max_frames>=4) return AVPROBE_SCORE_MAX/4;
71
    else if(max_frames>=1) return 1;
72
    else                   return 0;
73
//mpegps_mp3_unrecognized_format.mpg has max_frames=3
74
}
75

  
76
/**
77
 * Try to find Xing/Info/VBRI tags and compute duration from info therein
78
 */
79
static int mp3_parse_vbr_tags(AVFormatContext *s, AVStream *st, int64_t base)
80
{
81
    uint32_t v, spf;
82
    unsigned frames = 0; /* Total number of frames in file */
83
    unsigned size = 0; /* Total number of bytes in the stream */
84
    const int64_t xing_offtbl[2][2] = {{32, 17}, {17,9}};
85
    MPADecodeHeader c;
86
    int vbrtag_size = 0;
87

  
88
    v = get_be32(s->pb);
89
    if(ff_mpa_check_header(v) < 0)
90
      return -1;
91

  
92
    if (ff_mpegaudio_decode_header(&c, v) == 0)
93
        vbrtag_size = c.frame_size;
94
    if(c.layer != 3)
95
        return -1;
96

  
97
    /* Check for Xing / Info tag */
98
    url_fseek(s->pb, xing_offtbl[c.lsf == 1][c.nb_channels == 1], SEEK_CUR);
99
    v = get_be32(s->pb);
100
    if(v == MKBETAG('X', 'i', 'n', 'g') || v == MKBETAG('I', 'n', 'f', 'o')) {
101
        v = get_be32(s->pb);
102
        if(v & 0x1)
103
            frames = get_be32(s->pb);
104
        if(v & 0x2)
105
            size = get_be32(s->pb);
106
    }
107

  
108
    /* Check for VBRI tag (always 32 bytes after end of mpegaudio header) */
109
    url_fseek(s->pb, base + 4 + 32, SEEK_SET);
110
    v = get_be32(s->pb);
111
    if(v == MKBETAG('V', 'B', 'R', 'I')) {
112
        /* Check tag version */
113
        if(get_be16(s->pb) == 1) {
114
            /* skip delay and quality */
115
            url_fseek(s->pb, 4, SEEK_CUR);
116
            frames = get_be32(s->pb);
117
            size = get_be32(s->pb);
118
        }
119
    }
120

  
121
    if(!frames && !size)
122
        return -1;
123

  
124
    /* Skip the vbr tag frame */
125
    url_fseek(s->pb, base + vbrtag_size, SEEK_SET);
126

  
127
    spf = c.lsf ? 576 : 1152; /* Samples per frame, layer 3 */
128
    if(frames)
129
        st->duration = av_rescale_q(frames, (AVRational){spf, c.sample_rate},
130
                                    st->time_base);
131
    if(size && frames)
132
        st->codec->bit_rate = av_rescale(size, 8 * c.sample_rate, frames * (int64_t)spf);
133

  
134
    return 0;
135
}
136

  
137
static int mp3_read_header(AVFormatContext *s,
138
                           AVFormatParameters *ap)
139
{
140
    AVStream *st;
141
    int64_t off;
142

  
143
    st = av_new_stream(s, 0);
144
    if (!st)
145
        return AVERROR(ENOMEM);
146

  
147
    st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
148
    st->codec->codec_id = CODEC_ID_MP3;
149
    st->need_parsing = AVSTREAM_PARSE_FULL;
150
    st->start_time = 0;
151

  
152
    // lcm of all mp3 sample rates
153
    av_set_pts_info(st, 64, 1, 14112000);
154

  
155
    off = url_ftell(s->pb);
156

  
157
    if (!av_metadata_get(s->metadata, "", NULL, AV_METADATA_IGNORE_SUFFIX))
158
        ff_id3v1_read(s);
159

  
160
    if (mp3_parse_vbr_tags(s, st, off) < 0)
161
        url_fseek(s->pb, off, SEEK_SET);
162

  
163
    /* the parameters will be extracted from the compressed bitstream */
164
    return 0;
165
}
166

  
167
#define MP3_PACKET_SIZE 1024
168

  
169
static int mp3_read_packet(AVFormatContext *s, AVPacket *pkt)
170
{
171
    int ret, size;
172
    //    AVStream *st = s->streams[0];
173

  
174
    size= MP3_PACKET_SIZE;
175

  
176
    ret= av_get_packet(s->pb, pkt, size);
177

  
178
    pkt->stream_index = 0;
179
    if (ret <= 0) {
180
        return AVERROR(EIO);
181
    }
182
    /* note: we need to modify the packet size here to handle the last
183
       packet */
184
    pkt->size = ret;
185
    return ret;
186
}
187

  
188
AVInputFormat mp3_demuxer = {
189
    "mp3",
190
    NULL_IF_CONFIG_SMALL("MPEG audio layer 2/3"),
191
    0,
192
    mp3_read_probe,
193
    mp3_read_header,
194
    mp3_read_packet,
195
    .flags= AVFMT_GENERIC_INDEX,
196
    .extensions = "mp2,mp3,m2a", /* XXX: use probe */
197
};
198
#endif
199

  
200
#if CONFIG_MP2_MUXER || CONFIG_MP3_MUXER
201
static int id3v1_set_string(AVFormatContext *s, const char *key,
202
                            uint8_t *buf, int buf_size)
203
{
204
    AVMetadataTag *tag;
205
    if ((tag = av_metadata_get(s->metadata, key, NULL, 0)))
206
        strncpy(buf, tag->value, buf_size);
207
    return !!tag;
208
}
209

  
210
static int id3v1_create_tag(AVFormatContext *s, uint8_t *buf)
211
{
212
    AVMetadataTag *tag;
213
    int i, count = 0;
214

  
215
    memset(buf, 0, ID3v1_TAG_SIZE); /* fail safe */
216
    buf[0] = 'T';
217
    buf[1] = 'A';
218
    buf[2] = 'G';
219
    count += id3v1_set_string(s, "TIT2",    buf +  3, 30);       //title
220
    count += id3v1_set_string(s, "TPE1",    buf + 33, 30);       //author|artist
221
    count += id3v1_set_string(s, "TALB",    buf + 63, 30);       //album
222
    count += id3v1_set_string(s, "TDRL",    buf + 93,  4);       //date
223
    count += id3v1_set_string(s, "comment", buf + 97, 30);
224
    if ((tag = av_metadata_get(s->metadata, "TRCK", NULL, 0))) { //track
225
        buf[125] = 0;
226
        buf[126] = atoi(tag->value);
227
        count++;
228
    }
229
    buf[127] = 0xFF; /* default to unknown genre */
230
    if ((tag = av_metadata_get(s->metadata, "TCON", NULL, 0))) { //genre
231
        for(i = 0; i <= ID3v1_GENRE_MAX; i++) {
232
            if (!strcasecmp(tag->value, ff_id3v1_genre_str[i])) {
233
                buf[127] = i;
234
                count++;
235
                break;
236
            }
237
        }
238
    }
239
    return count;
240
}
241

  
242
/* simple formats */
243

  
244
static void id3v2_put_size(AVFormatContext *s, int size)
245
{
246
    put_byte(s->pb, size >> 21 & 0x7f);
247
    put_byte(s->pb, size >> 14 & 0x7f);
248
    put_byte(s->pb, size >> 7  & 0x7f);
249
    put_byte(s->pb, size       & 0x7f);
250
}
251

  
252
static void id3v2_put_ttag(AVFormatContext *s, const char *buf, int len,
253
                           uint32_t tag)
254
{
255
    put_be32(s->pb, tag);
256
    id3v2_put_size(s, len + 1);
257
    put_be16(s->pb, 0);
258
    put_byte(s->pb, 3); /* UTF-8 */
259
    put_buffer(s->pb, buf, len);
260
}
261

  
262

  
263
static int mp3_write_packet(struct AVFormatContext *s, AVPacket *pkt)
264
{
265
    put_buffer(s->pb, pkt->data, pkt->size);
266
    put_flush_packet(s->pb);
267
    return 0;
268
}
269

  
270
static int mp3_write_trailer(struct AVFormatContext *s)
271
{
272
    uint8_t buf[ID3v1_TAG_SIZE];
273

  
274
    /* write the id3v1 tag */
275
    if (id3v1_create_tag(s, buf) > 0) {
276
        put_buffer(s->pb, buf, ID3v1_TAG_SIZE);
277
        put_flush_packet(s->pb);
278
    }
279
    return 0;
280
}
281
#endif /* CONFIG_MP2_MUXER || CONFIG_MP3_MUXER */
282

  
283
#if CONFIG_MP2_MUXER
284
AVOutputFormat mp2_muxer = {
285
    "mp2",
286
    NULL_IF_CONFIG_SMALL("MPEG audio layer 2"),
287
    "audio/x-mpeg",
288
    "mp2,m2a",
289
    0,
290
    CODEC_ID_MP2,
291
    CODEC_ID_NONE,
292
    NULL,
293
    mp3_write_packet,
294
    mp3_write_trailer,
295
};
296
#endif
297

  
298
#if CONFIG_MP3_MUXER
299
/**
300
 * Write an ID3v2.4 header at beginning of stream
301
 */
302

  
303
static int mp3_write_header(struct AVFormatContext *s)
304
{
305
    AVMetadataTag *t = NULL;
306
    int totlen = 0;
307
    int64_t size_pos, cur_pos;
308

  
309
    put_be32(s->pb, MKBETAG('I', 'D', '3', 0x04)); /* ID3v2.4 */
310
    put_byte(s->pb, 0);
311
    put_byte(s->pb, 0); /* flags */
312

  
313
    /* reserve space for size */
314
    size_pos = url_ftell(s->pb);
315
    put_be32(s->pb, 0);
316

  
317
    ff_metadata_conv(&s->metadata, ff_id3v2_metadata_conv, NULL);
318
    while ((t = av_metadata_get(s->metadata, "", t, AV_METADATA_IGNORE_SUFFIX))) {
319
        uint32_t tag = 0;
320

  
321
        if (t->key[0] == 'T' && strlen(t->key) == 4) {
322
            int i;
323
            for (i = 0; *ff_id3v2_tags[i]; i++)
324
                if (AV_RB32(t->key) == AV_RB32(ff_id3v2_tags[i])) {
325
                    int len = strlen(t->value);
326
                    tag = AV_RB32(t->key);
327
                    totlen += len + ID3v2_HEADER_SIZE + 2;
328
                    id3v2_put_ttag(s, t->value, len + 1, tag);
329
                    break;
330
                }
331
        }
332

  
333
        if (!tag) { /* unknown tag, write as TXXX frame */
334
            int   len = strlen(t->key), len1 = strlen(t->value);
335
            char *buf = av_malloc(len + len1 + 2);
336
            if (!buf)
337
                return AVERROR(ENOMEM);
338
            tag = MKBETAG('T', 'X', 'X', 'X');
339
            strcpy(buf,           t->key);
340
            strcpy(buf + len + 1, t->value);
341
            id3v2_put_ttag(s, buf, len + len1 + 2, tag);
342
            totlen += len + len1 + ID3v2_HEADER_SIZE + 3;
343
            av_free(buf);
344
        }
345
    }
346

  
347
    cur_pos = url_ftell(s->pb);
348
    url_fseek(s->pb, size_pos, SEEK_SET);
349
    id3v2_put_size(s, totlen);
350
    url_fseek(s->pb, cur_pos, SEEK_SET);
351

  
352
    return 0;
353
}
354

  
355
AVOutputFormat mp3_muxer = {
356
    "mp3",
357
    NULL_IF_CONFIG_SMALL("MPEG audio layer 3"),
358
    "audio/x-mpeg",
359
    "mp3",
360
    0,
361
    CODEC_ID_MP3,
362
    CODEC_ID_NONE,
363
    mp3_write_header,
364
    mp3_write_packet,
365
    mp3_write_trailer,
366
    AVFMT_NOTIMESTAMPS,
367
};
368
#endif
libavformat/mp3dec.c
1
/*
2
 * MP3 demuxer
3
 * Copyright (c) 2003 Fabrice Bellard
4
 *
5
 * This file is part of FFmpeg.
6
 *
7
 * FFmpeg is free software; you can redistribute it and/or
8
 * modify it under the terms of the GNU Lesser General Public
9
 * License as published by the Free Software Foundation; either
10
 * version 2.1 of the License, or (at your option) any later version.
11
 *
12
 * FFmpeg is distributed in the hope that it will be useful,
13
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
15
 * Lesser General Public License for more details.
16
 *
17
 * You should have received a copy of the GNU Lesser General Public
18
 * License along with FFmpeg; if not, write to the Free Software
19
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20
 */
21

  
22
#include "libavutil/avstring.h"
23
#include "libavutil/intreadwrite.h"
24
#include "avformat.h"
25
#include "id3v2.h"
26
#include "id3v1.h"
27
#include "libavcodec/mpegaudiodecheader.h"
28

  
29
/* mp3 read */
30

  
31
static int mp3_read_probe(AVProbeData *p)
32
{
33
    int max_frames, first_frames = 0;
34
    int fsize, frames, sample_rate;
35
    uint32_t header;
36
    uint8_t *buf, *buf0, *buf2, *end;
37
    AVCodecContext avctx;
38

  
39
    buf0 = p->buf;
40
    end = p->buf + p->buf_size - sizeof(uint32_t);
41
    while(buf0 < end && !*buf0)
42
        buf0++;
43

  
44
    max_frames = 0;
45
    buf = buf0;
46

  
47
    for(; buf < end; buf= buf2+1) {
48
        buf2 = buf;
49

  
50
        for(frames = 0; buf2 < end; frames++) {
51
            header = AV_RB32(buf2);
52
            fsize = ff_mpa_decode_header(&avctx, header, &sample_rate, &sample_rate, &sample_rate, &sample_rate);
53
            if(fsize < 0)
54
                break;
55
            buf2 += fsize;
56
        }
57
        max_frames = FFMAX(max_frames, frames);
58
        if(buf == buf0)
59
            first_frames= frames;
60
    }
61
    // keep this in sync with ac3 probe, both need to avoid
62
    // issues with MPEG-files!
63
    if   (first_frames>=4) return AVPROBE_SCORE_MAX/2+1;
64
    else if(max_frames>500)return AVPROBE_SCORE_MAX/2;
65
    else if(max_frames>=4) return AVPROBE_SCORE_MAX/4;
66
    else if(max_frames>=1) return 1;
67
    else                   return 0;
68
//mpegps_mp3_unrecognized_format.mpg has max_frames=3
69
}
70

  
71
/**
72
 * Try to find Xing/Info/VBRI tags and compute duration from info therein
73
 */
74
static int mp3_parse_vbr_tags(AVFormatContext *s, AVStream *st, int64_t base)
75
{
76
    uint32_t v, spf;
77
    unsigned frames = 0; /* Total number of frames in file */
78
    unsigned size = 0; /* Total number of bytes in the stream */
79
    const int64_t xing_offtbl[2][2] = {{32, 17}, {17,9}};
80
    MPADecodeHeader c;
81
    int vbrtag_size = 0;
82

  
83
    v = get_be32(s->pb);
84
    if(ff_mpa_check_header(v) < 0)
85
      return -1;
86

  
87
    if (ff_mpegaudio_decode_header(&c, v) == 0)
88
        vbrtag_size = c.frame_size;
89
    if(c.layer != 3)
90
        return -1;
91

  
92
    /* Check for Xing / Info tag */
93
    url_fseek(s->pb, xing_offtbl[c.lsf == 1][c.nb_channels == 1], SEEK_CUR);
94
    v = get_be32(s->pb);
95
    if(v == MKBETAG('X', 'i', 'n', 'g') || v == MKBETAG('I', 'n', 'f', 'o')) {
96
        v = get_be32(s->pb);
97
        if(v & 0x1)
98
            frames = get_be32(s->pb);
99
        if(v & 0x2)
100
            size = get_be32(s->pb);
101
    }
102

  
103
    /* Check for VBRI tag (always 32 bytes after end of mpegaudio header) */
104
    url_fseek(s->pb, base + 4 + 32, SEEK_SET);
105
    v = get_be32(s->pb);
106
    if(v == MKBETAG('V', 'B', 'R', 'I')) {
107
        /* Check tag version */
108
        if(get_be16(s->pb) == 1) {
109
            /* skip delay and quality */
110
            url_fseek(s->pb, 4, SEEK_CUR);
111
            frames = get_be32(s->pb);
112
            size = get_be32(s->pb);
113
        }
114
    }
115

  
116
    if(!frames && !size)
117
        return -1;
118

  
119
    /* Skip the vbr tag frame */
120
    url_fseek(s->pb, base + vbrtag_size, SEEK_SET);
121

  
122
    spf = c.lsf ? 576 : 1152; /* Samples per frame, layer 3 */
123
    if(frames)
124
        st->duration = av_rescale_q(frames, (AVRational){spf, c.sample_rate},
125
                                    st->time_base);
126
    if(size && frames)
127
        st->codec->bit_rate = av_rescale(size, 8 * c.sample_rate, frames * (int64_t)spf);
128

  
129
    return 0;
130
}
131

  
132
static int mp3_read_header(AVFormatContext *s,
133
                           AVFormatParameters *ap)
134
{
135
    AVStream *st;
136
    int64_t off;
137

  
138
    st = av_new_stream(s, 0);
139
    if (!st)
140
        return AVERROR(ENOMEM);
141

  
142
    st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
143
    st->codec->codec_id = CODEC_ID_MP3;
144
    st->need_parsing = AVSTREAM_PARSE_FULL;
145
    st->start_time = 0;
146

  
147
    // lcm of all mp3 sample rates
148
    av_set_pts_info(st, 64, 1, 14112000);
149

  
150
    off = url_ftell(s->pb);
151

  
152
    if (!av_metadata_get(s->metadata, "", NULL, AV_METADATA_IGNORE_SUFFIX))
153
        ff_id3v1_read(s);
154

  
155
    if (mp3_parse_vbr_tags(s, st, off) < 0)
156
        url_fseek(s->pb, off, SEEK_SET);
157

  
158
    /* the parameters will be extracted from the compressed bitstream */
159
    return 0;
160
}
161

  
162
#define MP3_PACKET_SIZE 1024
163

  
164
static int mp3_read_packet(AVFormatContext *s, AVPacket *pkt)
165
{
166
    int ret, size;
167
    //    AVStream *st = s->streams[0];
168

  
169
    size= MP3_PACKET_SIZE;
170

  
171
    ret= av_get_packet(s->pb, pkt, size);
172

  
173
    pkt->stream_index = 0;
174
    if (ret <= 0) {
175
        return AVERROR(EIO);
176
    }
177
    /* note: we need to modify the packet size here to handle the last
178
       packet */
179
    pkt->size = ret;
180
    return ret;
181
}
182

  
183
AVInputFormat mp3_demuxer = {
184
    "mp3",
185
    NULL_IF_CONFIG_SMALL("MPEG audio layer 2/3"),
186
    0,
187
    mp3_read_probe,
188
    mp3_read_header,
189
    mp3_read_packet,
190
    .flags= AVFMT_GENERIC_INDEX,
191
    .extensions = "mp2,mp3,m2a", /* XXX: use probe */
192
};
libavformat/mp3enc.c
1
/*
2
 * MP3 muxer
3
 * Copyright (c) 2003 Fabrice Bellard
4
 *
5
 * This file is part of FFmpeg.
6
 *
7
 * FFmpeg is free software; you can redistribute it and/or
8
 * modify it under the terms of the GNU Lesser General Public
9
 * License as published by the Free Software Foundation; either
10
 * version 2.1 of the License, or (at your option) any later version.
11
 *
12
 * FFmpeg is distributed in the hope that it will be useful,
13
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
15
 * Lesser General Public License for more details.
16
 *
17
 * You should have received a copy of the GNU Lesser General Public
18
 * License along with FFmpeg; if not, write to the Free Software
19
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20
 */
21

  
22
#include <strings.h>
23
#include "avformat.h"
24
#include "id3v1.h"
25
#include "id3v2.h"
26
#include "libavutil/intreadwrite.h"
27

  
28
static int id3v1_set_string(AVFormatContext *s, const char *key,
29
                            uint8_t *buf, int buf_size)
30
{
31
    AVMetadataTag *tag;
32
    if ((tag = av_metadata_get(s->metadata, key, NULL, 0)))
33
        strncpy(buf, tag->value, buf_size);
34
    return !!tag;
35
}
36

  
37
static int id3v1_create_tag(AVFormatContext *s, uint8_t *buf)
38
{
39
    AVMetadataTag *tag;
40
    int i, count = 0;
41

  
42
    memset(buf, 0, ID3v1_TAG_SIZE); /* fail safe */
43
    buf[0] = 'T';
44
    buf[1] = 'A';
45
    buf[2] = 'G';
46
    count += id3v1_set_string(s, "TIT2",    buf +  3, 30);       //title
47
    count += id3v1_set_string(s, "TPE1",    buf + 33, 30);       //author|artist
48
    count += id3v1_set_string(s, "TALB",    buf + 63, 30);       //album
49
    count += id3v1_set_string(s, "TDRL",    buf + 93,  4);       //date
50
    count += id3v1_set_string(s, "comment", buf + 97, 30);
51
    if ((tag = av_metadata_get(s->metadata, "TRCK", NULL, 0))) { //track
52
        buf[125] = 0;
53
        buf[126] = atoi(tag->value);
54
        count++;
55
    }
56
    buf[127] = 0xFF; /* default to unknown genre */
57
    if ((tag = av_metadata_get(s->metadata, "TCON", NULL, 0))) { //genre
58
        for(i = 0; i <= ID3v1_GENRE_MAX; i++) {
59
            if (!strcasecmp(tag->value, ff_id3v1_genre_str[i])) {
60
                buf[127] = i;
61
                count++;
62
                break;
63
            }
64
        }
65
    }
66
    return count;
67
}
68

  
69
/* simple formats */
70

  
71
static void id3v2_put_size(AVFormatContext *s, int size)
72
{
73
    put_byte(s->pb, size >> 21 & 0x7f);
74
    put_byte(s->pb, size >> 14 & 0x7f);
75
    put_byte(s->pb, size >> 7  & 0x7f);
76
    put_byte(s->pb, size       & 0x7f);
77
}
78

  
79
static void id3v2_put_ttag(AVFormatContext *s, const char *buf, int len,
80
                           uint32_t tag)
81
{
82
    put_be32(s->pb, tag);
83
    id3v2_put_size(s, len + 1);
84
    put_be16(s->pb, 0);
85
    put_byte(s->pb, 3); /* UTF-8 */
86
    put_buffer(s->pb, buf, len);
87
}
88

  
89

  
90
static int mp3_write_packet(struct AVFormatContext *s, AVPacket *pkt)
91
{
92
    put_buffer(s->pb, pkt->data, pkt->size);
93
    put_flush_packet(s->pb);
94
    return 0;
95
}
96

  
97
static int mp3_write_trailer(struct AVFormatContext *s)
98
{
99
    uint8_t buf[ID3v1_TAG_SIZE];
100

  
101
    /* write the id3v1 tag */
102
    if (id3v1_create_tag(s, buf) > 0) {
103
        put_buffer(s->pb, buf, ID3v1_TAG_SIZE);
104
        put_flush_packet(s->pb);
105
    }
106
    return 0;
107
}
108

  
109
#if CONFIG_MP2_MUXER
110
AVOutputFormat mp2_muxer = {
111
    "mp2",
112
    NULL_IF_CONFIG_SMALL("MPEG audio layer 2"),
113
    "audio/x-mpeg",
114
    "mp2,m2a",
115
    0,
116
    CODEC_ID_MP2,
117
    CODEC_ID_NONE,
118
    NULL,
119
    mp3_write_packet,
120
    mp3_write_trailer,
121
};
122
#endif
123

  
124
#if CONFIG_MP3_MUXER
125
/**
126
 * Write an ID3v2.4 header at beginning of stream
127
 */
128

  
129
static int mp3_write_header(struct AVFormatContext *s)
130
{
131
    AVMetadataTag *t = NULL;
132
    int totlen = 0;
133
    int64_t size_pos, cur_pos;
134

  
135
    put_be32(s->pb, MKBETAG('I', 'D', '3', 0x04)); /* ID3v2.4 */
136
    put_byte(s->pb, 0);
137
    put_byte(s->pb, 0); /* flags */
138

  
139
    /* reserve space for size */
140
    size_pos = url_ftell(s->pb);
141
    put_be32(s->pb, 0);
142

  
143
    ff_metadata_conv(&s->metadata, ff_id3v2_metadata_conv, NULL);
144
    while ((t = av_metadata_get(s->metadata, "", t, AV_METADATA_IGNORE_SUFFIX))) {
145
        uint32_t tag = 0;
146

  
147
        if (t->key[0] == 'T' && strlen(t->key) == 4) {
148
            int i;
149
            for (i = 0; *ff_id3v2_tags[i]; i++)
150
                if (AV_RB32(t->key) == AV_RB32(ff_id3v2_tags[i])) {
151
                    int len = strlen(t->value);
152
                    tag = AV_RB32(t->key);
153
                    totlen += len + ID3v2_HEADER_SIZE + 2;
154
                    id3v2_put_ttag(s, t->value, len + 1, tag);
155
                    break;
156
                }
157
        }
158

  
159
        if (!tag) { /* unknown tag, write as TXXX frame */
160
            int   len = strlen(t->key), len1 = strlen(t->value);
161
            char *buf = av_malloc(len + len1 + 2);
162
            if (!buf)
163
                return AVERROR(ENOMEM);
164
            tag = MKBETAG('T', 'X', 'X', 'X');
165
            strcpy(buf,           t->key);
166
            strcpy(buf + len + 1, t->value);
167
            id3v2_put_ttag(s, buf, len + len1 + 2, tag);
168
            totlen += len + len1 + ID3v2_HEADER_SIZE + 3;
169
            av_free(buf);
170
        }
171
    }
172

  
173
    cur_pos = url_ftell(s->pb);
174
    url_fseek(s->pb, size_pos, SEEK_SET);
175
    id3v2_put_size(s, totlen);
176
    url_fseek(s->pb, cur_pos, SEEK_SET);
177

  
178
    return 0;
179
}
180

  
181
AVOutputFormat mp3_muxer = {
182
    "mp3",
183
    NULL_IF_CONFIG_SMALL("MPEG audio layer 3"),
184
    "audio/x-mpeg",
185
    "mp3",
186
    0,
187
    CODEC_ID_MP3,
188
    CODEC_ID_NONE,
189
    mp3_write_header,
190
    mp3_write_packet,
191
    mp3_write_trailer,
192
    AVFMT_NOTIMESTAMPS,
193
};
194
#endif

Also available in: Unified diff