Statistics
| Branch: | Revision:

ffmpeg / libavformat / mp3enc.c @ d08928bb

History | View | Annotate | Download (5.4 KB)

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