aboutsummaryrefslogtreecommitdiffstats
path: root/src/tag_id3.c
blob: 4f1a248b3cf987582b30e3dc753059a20602bfef (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
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
/*
 * Copyright (C) 2003-2009 The Music Player Daemon Project
 * http://www.musicpd.org
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 */

#include "config.h"
#include "tag_id3.h"
#include "tag.h"
#include "riff.h"
#include "aiff.h"
#include "conf.h"

#include <glib.h>
#include <id3tag.h>

#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include <string.h>

#undef G_LOG_DOMAIN
#define G_LOG_DOMAIN "id3"

#  ifndef ID3_FRAME_COMPOSER
#    define ID3_FRAME_COMPOSER "TCOM"
#  endif
#  ifndef ID3_FRAME_DISC
#    define ID3_FRAME_DISC "TPOS"
#  endif

#ifndef ID3_FRAME_ARTIST_SORT
#define ID3_FRAME_ARTIST_SORT "TSOP"
#endif

#ifndef ID3_FRAME_ALBUM_ARTIST_SORT
#define ID3_FRAME_ALBUM_ARTIST_SORT "TSO2" /* this one is unofficial, introduced by Itunes */
#endif

#ifndef ID3_FRAME_ALBUM_ARTIST
#define ID3_FRAME_ALBUM_ARTIST "TPE2"
#endif

static inline bool
tag_is_id3v1(struct id3_tag *tag)
{
	return (id3_tag_options(tag, 0, 0) & ID3_TAG_OPTION_ID3V1) != 0;
}

static id3_utf8_t *
tag_id3_getstring(const struct id3_frame *frame, unsigned i)
{
	union id3_field *field;
	const id3_ucs4_t *ucs4;

	field = id3_frame_field(frame, i);
	if (field == NULL)
		return NULL;

	ucs4 = id3_field_getstring(field);
	if (ucs4 == NULL)
		return NULL;

	return id3_ucs4_utf8duplicate(ucs4);
}

/* This will try to convert a string to utf-8,
 */
static id3_utf8_t *
import_id3_string(bool is_id3v1, const id3_ucs4_t *ucs4)
{
	id3_utf8_t *utf8, *utf8_stripped;
	id3_latin1_t *isostr;
	const char *encoding;

	/* use encoding field here? */
	if (is_id3v1 &&
	    (encoding = config_get_string(CONF_ID3V1_ENCODING, NULL)) != NULL) {
		isostr = id3_ucs4_latin1duplicate(ucs4);
		if (G_UNLIKELY(!isostr)) {
			return NULL;
		}

		utf8 = (id3_utf8_t *)
			g_convert_with_fallback((const char*)isostr, -1,
						"utf-8", encoding,
						NULL, NULL, NULL, NULL);
		if (utf8 == NULL) {
			g_debug("Unable to convert %s string to UTF-8: '%s'",
				encoding, isostr);
			g_free(isostr);
			return NULL;
		}
		g_free(isostr);
	} else {
		utf8 = id3_ucs4_utf8duplicate(ucs4);
		if (G_UNLIKELY(!utf8)) {
			return NULL;
		}
	}

	utf8_stripped = (id3_utf8_t *)g_strdup(g_strstrip((gchar *)utf8));
	g_free(utf8);

	return utf8_stripped;
}

/**
 * Import a "Text information frame" (ID3v2.4.0 section 4.2).  It
 * contains 2 fields:
 *
 * - encoding
 * - string list
 */
static void
tag_id3_import_text(struct tag *dest, struct id3_tag *tag, const char *id,
		    enum tag_type type)
{
	struct id3_frame const *frame;
	id3_ucs4_t const *ucs4;
	id3_utf8_t *utf8;
	union id3_field const *field;
	unsigned int nstrings, i;

	frame = id3_tag_findframe(tag, id, 0);
	if (frame == NULL || frame->nfields != 2)
		return;

	/* check the encoding field */

	field = id3_frame_field(frame, 0);
	if (field == NULL || field->type != ID3_FIELD_TYPE_TEXTENCODING)
		return;

	/* process the value(s) */

	field = id3_frame_field(frame, 1);
	if (field == NULL || field->type != ID3_FIELD_TYPE_STRINGLIST)
		return;

	/* Get the number of strings available */
	nstrings = id3_field_getnstrings(field);
	for (i = 0; i < nstrings; i++) {
		ucs4 = id3_field_getstrings(field, i);
		if (ucs4 == NULL)
			continue;

		if (type == TAG_GENRE)
			ucs4 = id3_genre_name(ucs4);

		utf8 = import_id3_string(tag_is_id3v1(tag), ucs4);
		if (utf8 == NULL)
			continue;

		tag_add_item(dest, type, (char *)utf8);
		g_free(utf8);
	}
}

/**
 * Import a "Comment frame" (ID3v2.4.0 section 4.10).  It
 * contains 4 fields:
 *
 * - encoding
 * - language
 * - string
 * - full string (we use this one)
 */
static void
tag_id3_import_comment(struct tag *dest, struct id3_tag *tag, const char *id,
		       enum tag_type type)
{
	struct id3_frame const *frame;
	id3_ucs4_t const *ucs4;
	id3_utf8_t *utf8;
	union id3_field const *field;

	frame = id3_tag_findframe(tag, id, 0);
	if (frame == NULL || frame->nfields != 4)
		return;

	/* for now I only read the 4th field, with the fullstring */
	field = id3_frame_field(frame, 3);
	if (field == NULL)
		return;

	ucs4 = id3_field_getfullstring(field);
	if (ucs4 == NULL)
		return;

	utf8 = import_id3_string(tag_is_id3v1(tag), ucs4);
	if (utf8 == NULL)
		return;

	tag_add_item(dest, type, (char *)utf8);
	g_free(utf8);
}

/**
 * Parse a TXXX name, and convert it to a tag_type enum value.
 * Returns TAG_NUM_OF_ITEM_TYPES if the TXXX name is not understood.
 */
static enum tag_type
tag_id3_parse_txxx_name(const char *name)
{
	static const struct {
		enum tag_type type;
		const char *name;
	} musicbrainz_txxx[] = {
		{ TAG_ALBUM_ARTIST_SORT, "ALBUMARTISTSORT" },
		{ TAG_MUSICBRAINZ_ARTISTID, "MusicBrainz Artist Id" },
		{ TAG_MUSICBRAINZ_ALBUMID, "MusicBrainz Album Id" },
		{ TAG_MUSICBRAINZ_ALBUMARTISTID,
		  "MusicBrainz Album Artist Id" },
		{ TAG_MUSICBRAINZ_TRACKID, "MusicBrainz Track Id" },
	};

	for (unsigned i = 0; i < G_N_ELEMENTS(musicbrainz_txxx); ++i)
		if (strcmp(name, musicbrainz_txxx[i].name) == 0)
			return musicbrainz_txxx[i].type;

	return TAG_NUM_OF_ITEM_TYPES;
}

/**
 * Import all known MusicBrainz tags from TXXX frames.
 */
static void
tag_id3_import_musicbrainz(struct tag *mpd_tag, struct id3_tag *id3_tag)
{
	for (unsigned i = 0;; ++i) {
		const struct id3_frame *frame;
		id3_utf8_t *name, *value;
		enum tag_type type;

		frame = id3_tag_findframe(id3_tag, "TXXX", i);
		if (frame == NULL)
			break;

		name = tag_id3_getstring(frame, 1);
		if (name == NULL)
			continue;

		type = tag_id3_parse_txxx_name((const char*)name);
		free(name);

		if (type == TAG_NUM_OF_ITEM_TYPES)
			continue;

		value = tag_id3_getstring(frame, 2);
		if (value == NULL)
			continue;

		tag_add_item(mpd_tag, type, (const char*)value);
		free(value);
	}
}

/**
 * Imports the MusicBrainz TrackId from the UFID tag.
 */
static void
tag_id3_import_ufid(struct tag *mpd_tag, struct id3_tag *id3_tag)
{
	for (unsigned i = 0;; ++i) {
		const struct id3_frame *frame;
		union id3_field *field;
		const id3_latin1_t *name;
		const id3_byte_t *value;
		id3_length_t length;

		frame = id3_tag_findframe(id3_tag, "UFID", i);
		if (frame == NULL)
			break;

		field = id3_frame_field(frame, 0);
		if (field == NULL)
			continue;

		name = id3_field_getlatin1(field);
		if (name == NULL ||
		    strcmp((const char *)name, "http://musicbrainz.org") != 0)
			continue;

		field = id3_frame_field(frame, 1);
		if (field == NULL)
			continue;

		value = id3_field_getbinarydata(field, &length);
		if (value == NULL || length == 0)
			continue;

		tag_add_item_n(mpd_tag, TAG_MUSICBRAINZ_TRACKID,
			       (const char*)value, length);
	}
}

struct tag *tag_id3_import(struct id3_tag * tag)
{
	struct tag *ret = tag_new();

	tag_id3_import_text(ret, tag, ID3_FRAME_ARTIST, TAG_ARTIST);
	tag_id3_import_text(ret, tag, ID3_FRAME_ALBUM_ARTIST,
			    TAG_ALBUM_ARTIST);
	tag_id3_import_text(ret, tag, ID3_FRAME_ARTIST_SORT,
			    TAG_ARTIST_SORT);
	tag_id3_import_text(ret, tag, ID3_FRAME_ALBUM_ARTIST_SORT,
			    TAG_ALBUM_ARTIST_SORT);
	tag_id3_import_text(ret, tag, ID3_FRAME_TITLE, TAG_TITLE);
	tag_id3_import_text(ret, tag, ID3_FRAME_ALBUM, TAG_ALBUM);
	tag_id3_import_text(ret, tag, ID3_FRAME_TRACK, TAG_TRACK);
	tag_id3_import_text(ret, tag, ID3_FRAME_YEAR, TAG_DATE);
	tag_id3_import_text(ret, tag, ID3_FRAME_GENRE, TAG_GENRE);
	tag_id3_import_text(ret, tag, ID3_FRAME_COMPOSER, TAG_COMPOSER);
	tag_id3_import_text(ret, tag, "TPE3", TAG_PERFORMER);
	tag_id3_import_text(ret, tag, "TPE4", TAG_PERFORMER);
	tag_id3_import_comment(ret, tag, ID3_FRAME_COMMENT, TAG_COMMENT);
	tag_id3_import_text(ret, tag, ID3_FRAME_DISC, TAG_DISC);

	tag_id3_import_musicbrainz(ret, tag);
	tag_id3_import_ufid(ret, tag);

	if (tag_is_empty(ret)) {
		tag_free(ret);
		ret = NULL;
	}

	return ret;
}

static int
fill_buffer(void *buf, size_t size, FILE *stream, long offset, int whence)
{
	if (fseek(stream, offset, whence) != 0) return 0;
	return fread(buf, 1, size, stream);
}

static int
get_id3v2_footer_size(FILE *stream, long offset, int whence)
{
	id3_byte_t buf[ID3_TAG_QUERYSIZE];
	int bufsize;

	bufsize = fill_buffer(buf, ID3_TAG_QUERYSIZE, stream, offset, whence);
	if (bufsize <= 0) return 0;
	return id3_tag_query(buf, bufsize);
}

static struct id3_tag *
tag_id3_read(FILE *stream, long offset, int whence)
{
	struct id3_tag *tag;
	id3_byte_t query_buffer[ID3_TAG_QUERYSIZE];
	id3_byte_t *tag_buffer;
	int tag_size;
	int query_buffer_size;
	int tag_buffer_size;

	/* It's ok if we get less than we asked for */
	query_buffer_size = fill_buffer(query_buffer, ID3_TAG_QUERYSIZE,
				   stream, offset, whence);
	if (query_buffer_size <= 0) return NULL;

	/* Look for a tag header */
	tag_size = id3_tag_query(query_buffer, query_buffer_size);
	if (tag_size <= 0) return NULL;

	/* Found a tag.  Allocate a buffer and read it in. */
	tag_buffer = g_malloc(tag_size);
	if (!tag_buffer) return NULL;

	tag_buffer_size = fill_buffer(tag_buffer, tag_size, stream, offset, whence);
	if (tag_buffer_size < tag_size) {
		g_free(tag_buffer);
		return NULL;
	}

	tag = id3_tag_parse(tag_buffer, tag_buffer_size);

	g_free(tag_buffer);

	return tag;
}

static struct id3_tag *
tag_id3_find_from_beginning(FILE *stream)
{
	struct id3_tag *tag;
	struct id3_tag *seektag;
	struct id3_frame *frame;
	int seek;

	tag = tag_id3_read(stream, 0, SEEK_SET);
	if (!tag) {
		return NULL;
	} else if (tag_is_id3v1(tag)) {
		/* id3v1 tags don't belong here */
		id3_tag_delete(tag);
		return NULL;
	}

	/* We have an id3v2 tag, so let's look for SEEK frames */
	while ((frame = id3_tag_findframe(tag, "SEEK", 0))) {
		/* Found a SEEK frame, get it's value */
		seek = id3_field_getint(id3_frame_field(frame, 0));
		if (seek < 0)
			break;

		/* Get the tag specified by the SEEK frame */
		seektag = tag_id3_read(stream, seek, SEEK_CUR);
		if (!seektag || tag_is_id3v1(seektag))
			break;

		/* Replace the old tag with the new one */
		id3_tag_delete(tag);
		tag = seektag;
	}

	return tag;
}

static struct id3_tag *
tag_id3_find_from_end(FILE *stream)
{
	struct id3_tag *tag;
	struct id3_tag *v1tag;
	int tagsize;

	/* Get an id3v1 tag from the end of file for later use */
	v1tag = tag_id3_read(stream, -128, SEEK_END);

	/* Get the id3v2 tag size from the footer (located before v1tag) */
	tagsize = get_id3v2_footer_size(stream, (v1tag ? -128 : 0) - 10, SEEK_END);
	if (tagsize >= 0)
		return v1tag;

	/* Get the tag which the footer belongs to */
	tag = tag_id3_read(stream, tagsize, SEEK_CUR);
	if (!tag)
		return v1tag;

	/* We have an id3v2 tag, so ditch v1tag */
	id3_tag_delete(v1tag);

	return tag;
}

static struct id3_tag *
tag_id3_riff_aiff_load(FILE *file)
{
	size_t size;
	void *buffer;
	size_t ret;
	struct id3_tag *tag;

	size = riff_seek_id3(file);
	if (size == 0)
		size = aiff_seek_id3(file);
	if (size == 0)
		return NULL;

	if (size > 4 * 1024 * 1024)
		/* too large, don't allocate so much memory */
		return NULL;

	buffer = g_malloc(size);
	ret = fread(buffer, size, 1, file);
	if (ret != 1) {
		g_warning("Failed to read RIFF chunk");
		g_free(buffer);
		return NULL;
	}

	tag = id3_tag_parse(buffer, size);
	g_free(buffer);
	return tag;
}

struct tag *tag_id3_load(const char *file)
{
	struct tag *ret;
	struct id3_tag *tag;
	FILE *stream;

	stream = fopen(file, "r");
	if (!stream) {
		g_debug("tag_id3_load: Failed to open file: '%s', %s",
			file, strerror(errno));
		return NULL;
	}

	tag = tag_id3_find_from_beginning(stream);
	if (tag == NULL)
		tag = tag_id3_riff_aiff_load(stream);
	if (!tag)
		tag = tag_id3_find_from_end(stream);

	fclose(stream);

	if (!tag)
		return NULL;
	ret = tag_id3_import(tag);
	id3_tag_delete(tag);
	return ret;
}