Statistics
| Branch: | Revision:

ffmpeg / libavformat / mp3.c @ 72415b2a

History | View | Annotate | Download (9.88 KB)

1 115329f1 Diego Biurrun
/*
2 7fbde343 Aurelien Jacobs
 * MP3 muxer and demuxer
3 406792e7 Diego Biurrun
 * Copyright (c) 2003 Fabrice Bellard
4 6a58e151 Fabrice Bellard
 *
5 b78e7197 Diego Biurrun
 * This file is part of FFmpeg.
6
 *
7
 * FFmpeg is free software; you can redistribute it and/or
8 6a58e151 Fabrice Bellard
 * modify it under the terms of the GNU Lesser General Public
9
 * License as published by the Free Software Foundation; either
10 b78e7197 Diego Biurrun
 * version 2.1 of the License, or (at your option) any later version.
11 6a58e151 Fabrice Bellard
 *
12 b78e7197 Diego Biurrun
 * FFmpeg is distributed in the hope that it will be useful,
13 6a58e151 Fabrice Bellard
 * 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 b78e7197 Diego Biurrun
 * License along with FFmpeg; if not, write to the Free Software
19 5509bffa Diego Biurrun
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20 6a58e151 Fabrice Bellard
 */
21 245976da Diego Biurrun
22 ea452b54 Aurelien Jacobs
#include <strings.h>
23 245976da Diego Biurrun
#include "libavutil/avstring.h"
24 ff06d76a Diego Biurrun
#include "libavutil/intreadwrite.h"
25 6a58e151 Fabrice Bellard
#include "avformat.h"
26 2ea512a6 Alex Converse
#include "id3v2.h"
27 75411182 Patrick Dehne
#include "id3v1.h"
28 52b53f86 Andreas Öman
29 de653ba3 Diego Biurrun
#if CONFIG_MP3_DEMUXER
30
31
#include "libavcodec/mpegaudio.h"
32
#include "libavcodec/mpegaudiodecheader.h"
33
34 6a58e151 Fabrice Bellard
/* mp3 read */
35 dc4ed3b1 Måns Rullgård
36
static int mp3_read_probe(AVProbeData *p)
37
{
38 ea7599ba Måns Rullgård
    int max_frames, first_frames = 0;
39 498c544a Michael Niedermayer
    int fsize, frames, sample_rate;
40 abade142 Andreas Öman
    uint32_t header;
41 ac3ef4a4 Alex Converse
    uint8_t *buf, *buf0, *buf2, *end;
42 abade142 Andreas Öman
    AVCodecContext avctx;
43 dc4ed3b1 Måns Rullgård
44 ac3ef4a4 Alex Converse
    buf0 = p->buf;
45
    if(ff_id3v2_match(buf0)) {
46
        buf0 += ff_id3v2_tag_len(buf0);
47
    }
48 5692ed3a Michael Niedermayer
    end = p->buf + p->buf_size - sizeof(uint32_t);
49
    while(buf0 < end && !*buf0)
50
        buf0++;
51 dc4ed3b1 Måns Rullgård
52 abade142 Andreas Öman
    max_frames = 0;
53 ac3ef4a4 Alex Converse
    buf = buf0;
54 dc4ed3b1 Måns Rullgård
55 5ef5501b Michael Niedermayer
    for(; buf < end; buf= buf2+1) {
56 abade142 Andreas Öman
        buf2 = buf;
57 dc4ed3b1 Måns Rullgård
58 d0702de9 Michael Niedermayer
        for(frames = 0; buf2 < end; frames++) {
59 80fb8234 Ronald S. Bultje
            header = AV_RB32(buf2);
60 c96bd212 Michael Niedermayer
            fsize = ff_mpa_decode_header(&avctx, header, &sample_rate, &sample_rate, &sample_rate, &sample_rate);
61 abade142 Andreas Öman
            if(fsize < 0)
62
                break;
63
            buf2 += fsize;
64
        }
65
        max_frames = FFMAX(max_frames, frames);
66 ac3ef4a4 Alex Converse
        if(buf == buf0)
67 22668218 Michael Niedermayer
            first_frames= frames;
68 abade142 Andreas Öman
    }
69 4b4ac5c7 Reimar Döffinger
    // keep this in sync with ac3 probe, both need to avoid
70
    // issues with MPEG-files!
71 1ac95630 Michael Niedermayer
    if   (first_frames>=4) return AVPROBE_SCORE_MAX/2+1;
72 2db97113 Michael Niedermayer
    else if(max_frames>500)return AVPROBE_SCORE_MAX/2;
73 f9f2ab82 Michael Niedermayer
    else if(max_frames>=4) return AVPROBE_SCORE_MAX/4;
74 d0f89acf Alex Converse
    else if(buf0!=p->buf)  return AVPROBE_SCORE_MAX/4-1;
75 22668218 Michael Niedermayer
    else if(max_frames>=1) return 1;
76 abade142 Andreas Öman
    else                   return 0;
77 f9f2ab82 Michael Niedermayer
//mpegps_mp3_unrecognized_format.mpg has max_frames=3
78 dc4ed3b1 Måns Rullgård
}
79
80 ca851a3a Andreas Öman
/**
81 8862fb41 Andreas Öman
 * Try to find Xing/Info/VBRI tags and compute duration from info therein
82 ca851a3a Andreas Öman
 */
83 853a9753 Yoav Steinberg
static int mp3_parse_vbr_tags(AVFormatContext *s, AVStream *st, int64_t base)
84 ca851a3a Andreas Öman
{
85 db233e83 Andreas Öman
    uint32_t v, spf;
86
    int frames = -1; /* Total number of frames in file */
87 bc5c918e Diego Biurrun
    const int64_t xing_offtbl[2][2] = {{32, 17}, {17,9}};
88 cf92cec7 Andreas Öman
    MPADecodeHeader c;
89 853a9753 Yoav Steinberg
    int vbrtag_size = 0;
90 ca851a3a Andreas Öman
91 899681cd Björn Axelsson
    v = get_be32(s->pb);
92 5b5bd7c9 Andreas Öman
    if(ff_mpa_check_header(v) < 0)
93 853a9753 Yoav Steinberg
      return -1;
94 5b5bd7c9 Andreas Öman
95 853a9753 Yoav Steinberg
    if (ff_mpegaudio_decode_header(&c, v) == 0)
96
        vbrtag_size = c.frame_size;
97 db233e83 Andreas Öman
    if(c.layer != 3)
98 853a9753 Yoav Steinberg
        return -1;
99 ca851a3a Andreas Öman
100 db233e83 Andreas Öman
    /* Check for Xing / Info tag */
101 899681cd Björn Axelsson
    url_fseek(s->pb, xing_offtbl[c.lsf == 1][c.nb_channels == 1], SEEK_CUR);
102
    v = get_be32(s->pb);
103 db233e83 Andreas Öman
    if(v == MKBETAG('X', 'i', 'n', 'g') || v == MKBETAG('I', 'n', 'f', 'o')) {
104 899681cd Björn Axelsson
        v = get_be32(s->pb);
105 478638ab Andreas Öman
        if(v & 0x1)
106 899681cd Björn Axelsson
            frames = get_be32(s->pb);
107 ca851a3a Andreas Öman
    }
108 db233e83 Andreas Öman
109 8862fb41 Andreas Öman
    /* Check for VBRI tag (always 32 bytes after end of mpegaudio header) */
110 899681cd Björn Axelsson
    url_fseek(s->pb, base + 4 + 32, SEEK_SET);
111
    v = get_be32(s->pb);
112 8862fb41 Andreas Öman
    if(v == MKBETAG('V', 'B', 'R', 'I')) {
113
        /* Check tag version */
114 899681cd Björn Axelsson
        if(get_be16(s->pb) == 1) {
115 8862fb41 Andreas Öman
            /* skip delay, quality and total bytes */
116 899681cd Björn Axelsson
            url_fseek(s->pb, 8, SEEK_CUR);
117
            frames = get_be32(s->pb);
118 8862fb41 Andreas Öman
        }
119
    }
120
121 db233e83 Andreas Öman
    if(frames < 0)
122 853a9753 Yoav Steinberg
        return -1;
123
124
    /* Skip the vbr tag frame */
125
    url_fseek(s->pb, base + vbrtag_size, SEEK_SET);
126 db233e83 Andreas Öman
127
    spf = c.lsf ? 576 : 1152; /* Samples per frame, layer 3 */
128
    st->duration = av_rescale_q(frames, (AVRational){spf, c.sample_rate},
129
                                st->time_base);
130 853a9753 Yoav Steinberg
    return 0;
131 ca851a3a Andreas Öman
}
132
133 6a58e151 Fabrice Bellard
static int mp3_read_header(AVFormatContext *s,
134
                           AVFormatParameters *ap)
135
{
136
    AVStream *st;
137 bc5c918e Diego Biurrun
    int64_t off;
138 6a58e151 Fabrice Bellard
139
    st = av_new_stream(s, 0);
140
    if (!st)
141 769e10f0 Panagiotis Issaris
        return AVERROR(ENOMEM);
142 6a58e151 Fabrice Bellard
143 72415b2a Stefano Sabatini
    st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
144 01f4895c Michael Niedermayer
    st->codec->codec_id = CODEC_ID_MP3;
145 57004ff1 Aurelien Jacobs
    st->need_parsing = AVSTREAM_PARSE_FULL;
146 f97931c1 Thorsten Jordan
    st->start_time = 0;
147 115329f1 Diego Biurrun
148 9c5a9e6b Baptiste Coudurier
    // lcm of all mp3 sample rates
149
    av_set_pts_info(st, 64, 1, 14112000);
150
151 50fcd5be Patrick Dehne
    ff_id3v2_read(s);
152 80242f9b Andreas Öman
    off = url_ftell(s->pb);
153
154 7fd5aeb3 Anton Khirnov
    if (!av_metadata_get(s->metadata, "", NULL, AV_METADATA_IGNORE_SUFFIX))
155
        ff_id3v1_read(s);
156 6a58e151 Fabrice Bellard
157 853a9753 Yoav Steinberg
    if (mp3_parse_vbr_tags(s, st, off) < 0)
158
        url_fseek(s->pb, off, SEEK_SET);
159 ca851a3a Andreas Öman
160 6a58e151 Fabrice Bellard
    /* the parameters will be extracted from the compressed bitstream */
161
    return 0;
162
}
163
164
#define MP3_PACKET_SIZE 1024
165
166
static int mp3_read_packet(AVFormatContext *s, AVPacket *pkt)
167
{
168
    int ret, size;
169
    //    AVStream *st = s->streams[0];
170 115329f1 Diego Biurrun
171 6a58e151 Fabrice Bellard
    size= MP3_PACKET_SIZE;
172
173 899681cd Björn Axelsson
    ret= av_get_packet(s->pb, pkt, size);
174 6a58e151 Fabrice Bellard
175
    pkt->stream_index = 0;
176
    if (ret <= 0) {
177 6f3e0b21 Panagiotis Issaris
        return AVERROR(EIO);
178 6a58e151 Fabrice Bellard
    }
179
    /* note: we need to modify the packet size here to handle the last
180
       packet */
181
    pkt->size = ret;
182
    return ret;
183
}
184
185 de653ba3 Diego Biurrun
AVInputFormat mp3_demuxer = {
186
    "mp3",
187
    NULL_IF_CONFIG_SMALL("MPEG audio layer 2/3"),
188
    0,
189
    mp3_read_probe,
190
    mp3_read_header,
191
    mp3_read_packet,
192
    .flags= AVFMT_GENERIC_INDEX,
193
    .extensions = "mp2,mp3,m2a", /* XXX: use probe */
194 41770abf Anton Khirnov
    .metadata_conv = ff_id3v2_metadata_conv,
195 de653ba3 Diego Biurrun
};
196
#endif
197
198 b250f9c6 Aurelien Jacobs
#if CONFIG_MP2_MUXER || CONFIG_MP3_MUXER
199 b182eeb0 Aurelien Jacobs
static int id3v1_set_string(AVFormatContext *s, const char *key,
200
                            uint8_t *buf, int buf_size)
201 58607ca7 Diego Biurrun
{
202 b182eeb0 Aurelien Jacobs
    AVMetadataTag *tag;
203
    if ((tag = av_metadata_get(s->metadata, key, NULL, 0)))
204
        strncpy(buf, tag->value, buf_size);
205
    return !!tag;
206
}
207
208
static int id3v1_create_tag(AVFormatContext *s, uint8_t *buf)
209
{
210
    AVMetadataTag *tag;
211
    int i, count = 0;
212 58607ca7 Diego Biurrun
213
    memset(buf, 0, ID3v1_TAG_SIZE); /* fail safe */
214
    buf[0] = 'T';
215
    buf[1] = 'A';
216
    buf[2] = 'G';
217 b182eeb0 Aurelien Jacobs
    count += id3v1_set_string(s, "title",   buf +  3, 30);
218
    count += id3v1_set_string(s, "author",  buf + 33, 30);
219
    count += id3v1_set_string(s, "album",   buf + 63, 30);
220 ca76a119 Anton Khirnov
    count += id3v1_set_string(s, "date",    buf + 93,  4);
221 b182eeb0 Aurelien Jacobs
    count += id3v1_set_string(s, "comment", buf + 97, 30);
222
    if ((tag = av_metadata_get(s->metadata, "track", NULL, 0))) {
223 58607ca7 Diego Biurrun
        buf[125] = 0;
224 b182eeb0 Aurelien Jacobs
        buf[126] = atoi(tag->value);
225
        count++;
226 58607ca7 Diego Biurrun
    }
227 ea25c063 Justin Ruggles
    buf[127] = 0xFF; /* default to unknown genre */
228 b182eeb0 Aurelien Jacobs
    if ((tag = av_metadata_get(s->metadata, "genre", NULL, 0))) {
229 ee56cab3 Aurelien Jacobs
        for(i = 0; i <= ID3v1_GENRE_MAX; i++) {
230 75411182 Patrick Dehne
            if (!strcasecmp(tag->value, ff_id3v1_genre_str[i])) {
231 ee56cab3 Aurelien Jacobs
                buf[127] = i;
232
                count++;
233
                break;
234
            }
235 58607ca7 Diego Biurrun
        }
236
    }
237 b182eeb0 Aurelien Jacobs
    return count;
238 58607ca7 Diego Biurrun
}
239
240 6a58e151 Fabrice Bellard
/* simple formats */
241 0dc56bfa Andreas Öman
242
static void id3v2_put_size(AVFormatContext *s, int size)
243
{
244 899681cd Björn Axelsson
    put_byte(s->pb, size >> 21 & 0x7f);
245
    put_byte(s->pb, size >> 14 & 0x7f);
246
    put_byte(s->pb, size >> 7  & 0x7f);
247
    put_byte(s->pb, size       & 0x7f);
248 0dc56bfa Andreas Öman
}
249
250 078d89a2 Anton Khirnov
static void id3v2_put_ttag(AVFormatContext *s, const char *buf, int len,
251
                           uint32_t tag)
252 0dc56bfa Andreas Öman
{
253 899681cd Björn Axelsson
    put_be32(s->pb, tag);
254 0dc56bfa Andreas Öman
    id3v2_put_size(s, len + 1);
255 899681cd Björn Axelsson
    put_be16(s->pb, 0);
256
    put_byte(s->pb, 3); /* UTF-8 */
257 078d89a2 Anton Khirnov
    put_buffer(s->pb, buf, len);
258 0dc56bfa Andreas Öman
}
259
260
261 0cd0a224 Diego Biurrun
static int mp3_write_packet(struct AVFormatContext *s, AVPacket *pkt)
262
{
263
    put_buffer(s->pb, pkt->data, pkt->size);
264
    put_flush_packet(s->pb);
265
    return 0;
266
}
267
268
static int mp3_write_trailer(struct AVFormatContext *s)
269
{
270
    uint8_t buf[ID3v1_TAG_SIZE];
271
272
    /* write the id3v1 tag */
273
    if (id3v1_create_tag(s, buf) > 0) {
274
        put_buffer(s->pb, buf, ID3v1_TAG_SIZE);
275
        put_flush_packet(s->pb);
276
    }
277
    return 0;
278
}
279
#endif /* CONFIG_MP2_MUXER || CONFIG_MP3_MUXER */
280
281
#if CONFIG_MP2_MUXER
282
AVOutputFormat mp2_muxer = {
283
    "mp2",
284
    NULL_IF_CONFIG_SMALL("MPEG audio layer 2"),
285
    "audio/x-mpeg",
286
    "mp2,m2a",
287
    0,
288
    CODEC_ID_MP2,
289
    CODEC_ID_NONE,
290
    NULL,
291
    mp3_write_packet,
292
    mp3_write_trailer,
293
};
294
#endif
295
296
#if CONFIG_MP3_MUXER
297 0dc56bfa Andreas Öman
/**
298
 * Write an ID3v2.4 header at beginning of stream
299
 */
300
301 6a58e151 Fabrice Bellard
static int mp3_write_header(struct AVFormatContext *s)
302
{
303 078d89a2 Anton Khirnov
    AVMetadataTag *t = NULL;
304 0dc56bfa Andreas Öman
    int totlen = 0;
305 078d89a2 Anton Khirnov
    int64_t size_pos, cur_pos;
306 0dc56bfa Andreas Öman
307 899681cd Björn Axelsson
    put_be32(s->pb, MKBETAG('I', 'D', '3', 0x04)); /* ID3v2.4 */
308
    put_byte(s->pb, 0);
309
    put_byte(s->pb, 0); /* flags */
310 0dc56bfa Andreas Öman
311 078d89a2 Anton Khirnov
    /* reserve space for size */
312
    size_pos = url_ftell(s->pb);
313
    put_be32(s->pb, 0);
314
315
    while ((t = av_metadata_get(s->metadata, "", t, AV_METADATA_IGNORE_SUFFIX))) {
316
        uint32_t tag = 0;
317
318 ed7694d8 Anton Khirnov
        if (t->key[0] == 'T' && strlen(t->key) == 4) {
319 078d89a2 Anton Khirnov
            int i;
320
            for (i = 0; *ff_id3v2_tags[i]; i++)
321
                if (AV_RB32(t->key) == AV_RB32(ff_id3v2_tags[i])) {
322
                    int len = strlen(t->value);
323
                    tag = AV_RB32(t->key);
324
                    totlen += len + ID3v2_HEADER_SIZE + 2;
325
                    id3v2_put_ttag(s, t->value, len + 1, tag);
326
                    break;
327
                }
328
        }
329
330
        if (!tag) { /* unknown tag, write as TXXX frame */
331
            int   len = strlen(t->key), len1 = strlen(t->value);
332
            char *buf = av_malloc(len + len1 + 2);
333
            if (!buf)
334
                return AVERROR(ENOMEM);
335
            tag = MKBETAG('T', 'X', 'X', 'X');
336
            strcpy(buf,           t->key);
337
            strcpy(buf + len + 1, t->value);
338
            id3v2_put_ttag(s, buf, len + len1 + 2, tag);
339
            totlen += len + len1 + ID3v2_HEADER_SIZE + 3;
340
            av_free(buf);
341
        }
342
    }
343
344
    cur_pos = url_ftell(s->pb);
345
    url_fseek(s->pb, size_pos, SEEK_SET);
346 0dc56bfa Andreas Öman
    id3v2_put_size(s, totlen);
347 078d89a2 Anton Khirnov
    url_fseek(s->pb, cur_pos, SEEK_SET);
348 0dc56bfa Andreas Öman
349 6a58e151 Fabrice Bellard
    return 0;
350
}
351
352 d2a067d1 Måns Rullgård
AVOutputFormat mp3_muxer = {
353 6a58e151 Fabrice Bellard
    "mp3",
354 bde15e74 Stefano Sabatini
    NULL_IF_CONFIG_SMALL("MPEG audio layer 3"),
355 6a58e151 Fabrice Bellard
    "audio/x-mpeg",
356
    "mp3",
357
    0,
358
    CODEC_ID_MP3,
359 d9133126 Carl Eugen Hoyos
    CODEC_ID_NONE,
360 6a58e151 Fabrice Bellard
    mp3_write_header,
361
    mp3_write_packet,
362
    mp3_write_trailer,
363 6378b062 Anton Khirnov
    .metadata_conv = ff_id3v2_metadata_conv,
364 6a58e151 Fabrice Bellard
};
365
#endif