aboutsummaryrefslogtreecommitdiffstats
path: root/libavformat/id3v2enc.c
blob: 60ddbaaafc50e056afd257eacf65195a4b18f9a3 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
/*
 * ID3v2 header writer
 *
 * This file is part of FFmpeg.
 *
 * FFmpeg is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * FFmpeg is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with FFmpeg; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 */

#include <stdint.h>
#include <string.h>

#include "libavutil/avstring.h"
#include "libavutil/dict.h"
#include "libavutil/intreadwrite.h"
#include "avformat.h"
#include "avio.h"
#include "id3v2.h"

static void id3v2_put_size(AVIOContext *pb, int size)
{
    avio_w8(pb, size >> 21 & 0x7f);
    avio_w8(pb, size >> 14 & 0x7f);
    avio_w8(pb, size >> 7  & 0x7f);
    avio_w8(pb, size       & 0x7f);
}

static int string_is_ascii(const uint8_t *str)
{
    while (*str && *str < 128) str++;
    return !*str;
}

static void id3v2_encode_string(AVIOContext *pb, const uint8_t *str,
                               enum ID3v2Encoding enc)
{
    int (*put)(AVIOContext*, const char*);

    if (enc == ID3v2_ENCODING_UTF16BOM) {
        avio_wl16(pb, 0xFEFF);      /* BOM */
        put = avio_put_str16le;
    } else
        put = avio_put_str;

    put(pb, str);
}

/**
 * Write a text frame with one (normal frames) or two (TXXX frames) strings
 * according to encoding (only UTF-8 or UTF-16+BOM supported).
 * @return number of bytes written or a negative error code.
 */
static int id3v2_put_ttag(ID3v2EncContext *id3, AVIOContext *avioc, const char *str1, const char *str2,
                          uint32_t tag, enum ID3v2Encoding enc)
{
    int len;
    uint8_t *pb;
    AVIOContext *dyn_buf;
    if (avio_open_dyn_buf(&dyn_buf) < 0)
        return AVERROR(ENOMEM);

    /* check if the strings are ASCII-only and use UTF16 only if
     * they're not */
    if (enc == ID3v2_ENCODING_UTF16BOM && string_is_ascii(str1) &&
        (!str2 || string_is_ascii(str2)))
        enc = ID3v2_ENCODING_ISO8859;

    avio_w8(dyn_buf, enc);
    id3v2_encode_string(dyn_buf, str1, enc);
    if (str2)
        id3v2_encode_string(dyn_buf, str2, enc);
    len = avio_close_dyn_buf(dyn_buf, &pb);

    avio_wb32(avioc, tag);
    /* ID3v2.3 frame size is not synchsafe */
    if (id3->version == 3)
        avio_wb32(avioc, len);
    else
        id3v2_put_size(avioc, len);
    avio_wb16(avioc, 0);
    avio_write(avioc, pb, len);

    av_freep(&pb);
    return len + ID3v2_HEADER_SIZE;
}

static int id3v2_check_write_tag(ID3v2EncContext *id3, AVIOContext *pb, AVDictionaryEntry *t,
                                 const char table[][4], enum ID3v2Encoding enc)
{
    uint32_t tag;
    int i;

    if (t->key[0] != 'T' || strlen(t->key) != 4)
        return -1;
    tag = AV_RB32(t->key);
    for (i = 0; *table[i]; i++)
        if (tag == AV_RB32(table[i]))
            return id3v2_put_ttag(id3, pb, t->value, NULL, tag, enc);
    return -1;
}

static void id3v2_3_metadata_split_date(AVDictionary **pm)
{
    AVDictionaryEntry *mtag = NULL;
    AVDictionary *dst = NULL;
    const char *key, *value;
    char year[5] = {0}, day_month[5] = {0};
    int i;

    while ((mtag = av_dict_get(*pm, "", mtag, AV_DICT_IGNORE_SUFFIX))) {
        key = mtag->key;
        if (!av_strcasecmp(key, "date")) {
            /* split date tag using "YYYY-MM-DD" format into year and month/day segments */
            value = mtag->value;
            i = 0;
            while (value[i] >= '0' && value[i] <= '9') i++;
            if (value[i] == '\0' || value[i] == '-') {
                av_strlcpy(year, value, sizeof(year));
                av_dict_set(&dst, "TYER", year, 0);

                if (value[i] == '-' &&
                    value[i+1] >= '0' && value[i+1] <= '1' &&
                    value[i+2] >= '0' && value[i+2] <= '9' &&
                    value[i+3] == '-' &&
                    value[i+4] >= '0' && value[i+4] <= '3' &&
                    value[i+5] >= '0' && value[i+5] <= '9' &&
                    (value[i+6] == '\0' || value[i+6] == ' ')) {
                    snprintf(day_month, sizeof(day_month), "%.2s%.2s", value + i + 4, value + i + 1);
                    av_dict_set(&dst, "TDAT", day_month, 0);
                }
            } else
                av_dict_set(&dst, key, value, 0);
        } else
            av_dict_set(&dst, key, mtag->value, 0);
    }
    av_dict_free(pm);
    *pm = dst;
}

void ff_id3v2_start(ID3v2EncContext *id3, AVIOContext *pb, int id3v2_version,
                    const char *magic)
{
    id3->version = id3v2_version;

    avio_wb32(pb, MKBETAG(magic[0], magic[1], magic[2], id3v2_version));
    avio_w8(pb, 0);
    avio_w8(pb, 0); /* flags */

    /* reserve space for size */
    id3->size_pos = avio_tell(pb);
    avio_wb32(pb, 0);
}

static int write_metadata(AVIOContext *pb, AVDictionary **metadata,
                          ID3v2EncContext *id3, int enc)
{
    AVDictionaryEntry *t = NULL;
    int ret;

    ff_metadata_conv(metadata, ff_id3v2_34_metadata_conv, NULL);
    if (id3->version == 3)
        id3v2_3_metadata_split_date(metadata);
    else if (id3->version == 4)
        ff_metadata_conv(metadata, ff_id3v2_4_metadata_conv, NULL);

    while ((t = av_dict_get(*metadata, "", t, AV_DICT_IGNORE_SUFFIX))) {
        if ((ret = id3v2_check_write_tag(id3, pb, t, ff_id3v2_tags, enc)) > 0) {
            id3->len += ret;
            continue;
        }
        if ((ret = id3v2_check_write_tag(id3, pb, t, id3->version == 3 ?
                                         ff_id3v2_3_tags : ff_id3v2_4_tags, enc)) > 0) {
            id3->len += ret;
            continue;
        }

        /* unknown tag, write as TXXX frame */
        if ((ret = id3v2_put_ttag(id3, pb, t->key, t->value, MKBETAG('T', 'X', 'X', 'X'), enc)) < 0)
            return ret;
        id3->len += ret;
    }

    return 0;
}

static int write_chapter(AVFormatContext *s, ID3v2EncContext *id3, int id, int enc)
{
    const AVRational time_base = {1, 1000};
    AVChapter *ch = s->chapters[id];
    uint8_t *dyn_buf = NULL;
    AVIOContext *dyn_bc = NULL;
    char name[123];
    int len, start, end, ret;

    if ((ret = avio_open_dyn_buf(&dyn_bc)) < 0)
        goto fail;

    start = av_rescale_q(ch->start, ch->time_base, time_base);
    end   = av_rescale_q(ch->end,   ch->time_base, time_base);

    snprintf(name, 122, "ch%d", id);
    id3->len += avio_put_str(dyn_bc, name);
    avio_wb32(dyn_bc, start);
    avio_wb32(dyn_bc, end);
    avio_wb32(dyn_bc, 0xFFFFFFFFu);
    avio_wb32(dyn_bc, 0xFFFFFFFFu);

    if ((ret = write_metadata(dyn_bc, &ch->metadata, id3, enc)) < 0)
        goto fail;

    len = avio_close_dyn_buf(dyn_bc, &dyn_buf);
    id3->len += 16 + ID3v2_HEADER_SIZE;

    avio_wb32(s->pb, MKBETAG('C', 'H', 'A', 'P'));
    avio_wb32(s->pb, len);
    avio_wb16(s->pb, 0);
    avio_write(s->pb, dyn_buf, len);

fail:
    if (dyn_bc && !dyn_buf)
        avio_close_dyn_buf(dyn_bc, &dyn_buf);
    av_freep(&dyn_buf);

    return ret;
}

int ff_id3v2_write_metadata(AVFormatContext *s, ID3v2EncContext *id3)
{
    int enc = id3->version == 3 ? ID3v2_ENCODING_UTF16BOM :
                                  ID3v2_ENCODING_UTF8;
    int i, ret;

    if ((ret = write_metadata(s->pb, &s->metadata, id3, enc)) < 0)
        return ret;

    for (i = 0; i < s->nb_chapters; i++) {
        if ((ret = write_chapter(s, id3, i, enc)) < 0)
            return ret;
    }

    return 0;
}

int ff_id3v2_write_apic(AVFormatContext *s, ID3v2EncContext *id3, AVPacket *pkt)
{
    AVStream *st = s->streams[pkt->stream_index];
    AVDictionaryEntry *e;

    AVIOContext *dyn_buf;
    uint8_t     *buf;
    const CodecMime *mime = ff_id3v2_mime_tags;
    const char  *mimetype = NULL, *desc = "";
    int enc = id3->version == 3 ? ID3v2_ENCODING_UTF16BOM :
                                  ID3v2_ENCODING_UTF8;
    int i, len, type = 0;

    /* get the mimetype*/
    while (mime->id != AV_CODEC_ID_NONE) {
        if (mime->id == st->codec->codec_id) {
            mimetype = mime->str;
            break;
        }
        mime++;
    }
    if (!mimetype) {
        av_log(s, AV_LOG_ERROR, "No mimetype is known for stream %d, cannot "
               "write an attached picture.\n", st->index);
        return AVERROR(EINVAL);
    }

    /* get the picture type */
    e = av_dict_get(st->metadata, "comment", NULL, 0);
    for (i = 0; e && i < FF_ARRAY_ELEMS(ff_id3v2_picture_types); i++) {
        if (strstr(ff_id3v2_picture_types[i], e->value) == ff_id3v2_picture_types[i]) {
            type = i;
            break;
        }
    }

    /* get the description */
    if ((e = av_dict_get(st->metadata, "title", NULL, 0)))
        desc = e->value;

    /* start writing */
    if (avio_open_dyn_buf(&dyn_buf) < 0)
        return AVERROR(ENOMEM);

    avio_w8(dyn_buf, enc);
    avio_put_str(dyn_buf, mimetype);
    avio_w8(dyn_buf, type);
    id3v2_encode_string(dyn_buf, desc, enc);
    avio_write(dyn_buf, pkt->data, pkt->size);
    len = avio_close_dyn_buf(dyn_buf, &buf);

    avio_wb32(s->pb, MKBETAG('A', 'P', 'I', 'C'));
    if (id3->version == 3)
        avio_wb32(s->pb, len);
    else
        id3v2_put_size(s->pb, len);
    avio_wb16(s->pb, 0);
    avio_write(s->pb, buf, len);
    av_freep(&buf);

    id3->len += len + ID3v2_HEADER_SIZE;

    return 0;
}

void ff_id3v2_finish(ID3v2EncContext *id3, AVIOContext *pb)
{
    int64_t cur_pos = avio_tell(pb);
    avio_seek(pb, id3->size_pos, SEEK_SET);
    id3v2_put_size(pb, id3->len);
    avio_seek(pb, cur_pos, SEEK_SET);
}

int ff_id3v2_write_simple(struct AVFormatContext *s, int id3v2_version,
                          const char *magic)
{
    ID3v2EncContext id3 = { 0 };
    int ret;

    ff_id3v2_start(&id3, s->pb, id3v2_version, magic);
    if ((ret = ff_id3v2_write_metadata(s, &id3)) < 0)
        return ret;
    ff_id3v2_finish(&id3, s->pb);

    return 0;
}