2 * Copyright (C) 2003 Benjamin Otte <in7y118@public.uni-hamburg.de>
4 * gsttaglist.c: tag support (aka metadata)
6 * This library is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Library General Public
8 * License as published by the Free Software Foundation; either
9 * version 2 of the License, or (at your option) any later version.
11 * This library is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Library General Public License for more details.
16 * You should have received a copy of the GNU Library General Public
17 * License along with this library; if not, write to the
18 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
19 * Boston, MA 02111-1307, USA.
24 * @short_description: List of tags and values used to describe media metadata
26 * List of tags and values used to describe media metadata.
28 * Strings must be in ASCII or UTF-8 encoding. No other encodings are allowed.
30 * Last reviewed on 2009-06-09 (0.10.23)
37 #include "gst_private.h"
38 #include "math-compat.h"
39 #include "gst-i18n-lib.h"
40 #include "gsttaglist.h"
43 #include "gstbuffer.h"
45 #include "gststructure.h"
47 #include <gobject/gvaluecollector.h>
50 /* FIXME: add category for tags */
51 #define GST_CAT_TAGS GST_CAT_DEFAULT
53 #define GST_TAG_IS_VALID(tag) (gst_tag_get_info (tag) != NULL)
55 typedef struct _GstTagListImpl
59 GstStructure *structure;
62 #define GST_TAG_LIST_STRUCTURE(taglist) ((GstTagListImpl*)(taglist))->structure
66 GType type; /* type the data is in */
68 const gchar *nick; /* translated short description */
69 const gchar *blurb; /* translated long description */
71 GstTagMergeFunc merge_func; /* functions to merge the values */
72 GstTagFlag flag; /* type of tag */
73 GQuark name_quark; /* quark for the name */
77 #define g_value_get_char g_value_get_schar
79 static GMutex __tag_mutex;
80 #define TAG_LOCK g_mutex_lock (&__tag_mutex)
81 #define TAG_UNLOCK g_mutex_unlock (&__tag_mutex)
83 /* tags hash table: maps tag name string => GstTagInfo */
84 static GHashTable *__tags;
86 GST_DEFINE_MINI_OBJECT_TYPE (GstTagList, gst_tag_list);
88 static void __gst_tag_list_free (GstTagList * list);
89 static GstTagList *__gst_tag_list_copy (const GstTagList * list);
92 * g_value_register_transform_func (_gst_tag_list_type, G_TYPE_STRING,
93 * _gst_structure_transform_to_string);
96 _priv_gst_tag_initialize (void)
98 g_mutex_init (&__tag_mutex);
100 __tags = g_hash_table_new (g_str_hash, g_str_equal);
101 gst_tag_register_static (GST_TAG_TITLE, GST_TAG_FLAG_META,
103 _("title"), _("commonly used title"), gst_tag_merge_strings_with_comma);
104 gst_tag_register_static (GST_TAG_TITLE_SORTNAME, GST_TAG_FLAG_META,
106 _("title sortname"), _("commonly used title for sorting purposes"), NULL);
107 gst_tag_register_static (GST_TAG_ARTIST, GST_TAG_FLAG_META,
110 _("person(s) responsible for the recording"),
111 gst_tag_merge_strings_with_comma);
112 gst_tag_register_static (GST_TAG_ARTIST_SORTNAME, GST_TAG_FLAG_META,
114 _("artist sortname"),
115 _("person(s) responsible for the recording for sorting purposes"), NULL);
116 gst_tag_register_static (GST_TAG_ALBUM, GST_TAG_FLAG_META,
119 _("album containing this data"), gst_tag_merge_strings_with_comma);
120 gst_tag_register_static (GST_TAG_ALBUM_SORTNAME, GST_TAG_FLAG_META,
123 _("album containing this data for sorting purposes"), NULL);
124 gst_tag_register_static (GST_TAG_ALBUM_ARTIST, GST_TAG_FLAG_META,
127 _("The artist of the entire album, as it should be displayed"),
128 gst_tag_merge_strings_with_comma);
129 gst_tag_register_static (GST_TAG_ALBUM_ARTIST_SORTNAME, GST_TAG_FLAG_META,
131 _("album artist sortname"),
132 _("The artist of the entire album, as it should be sorted"), NULL);
133 gst_tag_register_static (GST_TAG_DATE, GST_TAG_FLAG_META, G_TYPE_DATE,
134 _("date"), _("date the data was created (as a GDate structure)"), NULL);
135 gst_tag_register_static (GST_TAG_DATE_TIME, GST_TAG_FLAG_META,
136 GST_TYPE_DATE_TIME, _("datetime"),
137 _("date and time the data was created (as a GstDateTime structure)"),
139 gst_tag_register_static (GST_TAG_GENRE, GST_TAG_FLAG_META,
142 _("genre this data belongs to"), gst_tag_merge_strings_with_comma);
143 gst_tag_register_static (GST_TAG_COMMENT, GST_TAG_FLAG_META,
146 _("free text commenting the data"), gst_tag_merge_use_first);
147 gst_tag_register_static (GST_TAG_EXTENDED_COMMENT, GST_TAG_FLAG_META,
149 _("extended comment"),
150 _("free text commenting the data in key=value or key[en]=comment form"),
151 gst_tag_merge_use_first);
152 gst_tag_register_static (GST_TAG_TRACK_NUMBER, GST_TAG_FLAG_META,
155 _("track number inside a collection"), gst_tag_merge_use_first);
156 gst_tag_register_static (GST_TAG_TRACK_COUNT, GST_TAG_FLAG_META,
159 _("count of tracks inside collection this track belongs to"),
160 gst_tag_merge_use_first);
161 gst_tag_register_static (GST_TAG_ALBUM_VOLUME_NUMBER, GST_TAG_FLAG_META,
164 _("disc number inside a collection"), gst_tag_merge_use_first);
165 gst_tag_register_static (GST_TAG_ALBUM_VOLUME_COUNT, GST_TAG_FLAG_META,
168 _("count of discs inside collection this disc belongs to"),
169 gst_tag_merge_use_first);
170 gst_tag_register_static (GST_TAG_LOCATION, GST_TAG_FLAG_META,
172 _("location"), _("Origin of media as a URI (location, where the "
173 "original of the file or stream is hosted)"),
174 gst_tag_merge_strings_with_comma);
175 gst_tag_register_static (GST_TAG_HOMEPAGE, GST_TAG_FLAG_META,
178 _("Homepage for this media (i.e. artist or movie homepage)"),
179 gst_tag_merge_strings_with_comma);
180 gst_tag_register_static (GST_TAG_DESCRIPTION, GST_TAG_FLAG_META,
181 G_TYPE_STRING, _("description"),
182 _("short text describing the content of the data"),
183 gst_tag_merge_strings_with_comma);
184 gst_tag_register_static (GST_TAG_VERSION, GST_TAG_FLAG_META, G_TYPE_STRING,
185 _("version"), _("version of this data"), NULL);
186 gst_tag_register_static (GST_TAG_ISRC, GST_TAG_FLAG_META, G_TYPE_STRING,
189 ("International Standard Recording Code - see http://www.ifpi.org/isrc/"),
191 /* FIXME: organization (fix what? tpm) */
192 gst_tag_register_static (GST_TAG_ORGANIZATION, GST_TAG_FLAG_META,
193 G_TYPE_STRING, _("organization"), _("organization"),
194 gst_tag_merge_strings_with_comma);
195 gst_tag_register_static (GST_TAG_COPYRIGHT, GST_TAG_FLAG_META,
196 G_TYPE_STRING, _("copyright"), _("copyright notice of the data"), NULL);
197 gst_tag_register_static (GST_TAG_COPYRIGHT_URI, GST_TAG_FLAG_META,
198 G_TYPE_STRING, _("copyright uri"),
199 _("URI to the copyright notice of the data"), NULL);
200 gst_tag_register_static (GST_TAG_ENCODED_BY, GST_TAG_FLAG_META, G_TYPE_STRING,
201 _("encoded by"), _("name of the encoding person or organization"),
202 gst_tag_merge_strings_with_comma);
203 gst_tag_register_static (GST_TAG_CONTACT, GST_TAG_FLAG_META,
205 _("contact"), _("contact information"), gst_tag_merge_strings_with_comma);
206 gst_tag_register_static (GST_TAG_LICENSE, GST_TAG_FLAG_META,
207 G_TYPE_STRING, _("license"), _("license of data"), NULL);
208 gst_tag_register_static (GST_TAG_LICENSE_URI, GST_TAG_FLAG_META,
209 G_TYPE_STRING, _("license uri"),
210 _("URI to the license of the data"), NULL);
211 gst_tag_register_static (GST_TAG_PERFORMER, GST_TAG_FLAG_META,
214 _("person(s) performing"), gst_tag_merge_strings_with_comma);
215 gst_tag_register_static (GST_TAG_COMPOSER, GST_TAG_FLAG_META,
218 _("person(s) who composed the recording"),
219 gst_tag_merge_strings_with_comma);
220 gst_tag_register_static (GST_TAG_DURATION, GST_TAG_FLAG_DECODED,
222 _("duration"), _("length in GStreamer time units (nanoseconds)"), NULL);
223 gst_tag_register_static (GST_TAG_CODEC, GST_TAG_FLAG_ENCODED,
226 _("codec the data is stored in"), gst_tag_merge_strings_with_comma);
227 gst_tag_register_static (GST_TAG_VIDEO_CODEC, GST_TAG_FLAG_ENCODED,
229 _("video codec"), _("codec the video data is stored in"), NULL);
230 gst_tag_register_static (GST_TAG_AUDIO_CODEC, GST_TAG_FLAG_ENCODED,
232 _("audio codec"), _("codec the audio data is stored in"), NULL);
233 gst_tag_register_static (GST_TAG_SUBTITLE_CODEC, GST_TAG_FLAG_ENCODED,
235 _("subtitle codec"), _("codec the subtitle data is stored in"), NULL);
236 gst_tag_register_static (GST_TAG_CONTAINER_FORMAT, GST_TAG_FLAG_ENCODED,
237 G_TYPE_STRING, _("container format"),
238 _("container format the data is stored in"), NULL);
239 gst_tag_register_static (GST_TAG_BITRATE, GST_TAG_FLAG_ENCODED,
240 G_TYPE_UINT, _("bitrate"), _("exact or average bitrate in bits/s"), NULL);
241 gst_tag_register_static (GST_TAG_NOMINAL_BITRATE, GST_TAG_FLAG_ENCODED,
242 G_TYPE_UINT, _("nominal bitrate"), _("nominal bitrate in bits/s"), NULL);
243 gst_tag_register_static (GST_TAG_MINIMUM_BITRATE, GST_TAG_FLAG_ENCODED,
244 G_TYPE_UINT, _("minimum bitrate"), _("minimum bitrate in bits/s"), NULL);
245 gst_tag_register_static (GST_TAG_MAXIMUM_BITRATE, GST_TAG_FLAG_ENCODED,
246 G_TYPE_UINT, _("maximum bitrate"), _("maximum bitrate in bits/s"), NULL);
247 gst_tag_register_static (GST_TAG_ENCODER, GST_TAG_FLAG_ENCODED,
249 _("encoder"), _("encoder used to encode this stream"), NULL);
250 gst_tag_register_static (GST_TAG_ENCODER_VERSION, GST_TAG_FLAG_ENCODED,
252 _("encoder version"),
253 _("version of the encoder used to encode this stream"), NULL);
254 gst_tag_register_static (GST_TAG_SERIAL, GST_TAG_FLAG_ENCODED,
255 G_TYPE_UINT, _("serial"), _("serial number of track"), NULL);
256 gst_tag_register_static (GST_TAG_TRACK_GAIN, GST_TAG_FLAG_META,
257 G_TYPE_DOUBLE, _("replaygain track gain"), _("track gain in db"), NULL);
258 gst_tag_register_static (GST_TAG_TRACK_PEAK, GST_TAG_FLAG_META,
259 G_TYPE_DOUBLE, _("replaygain track peak"), _("peak of the track"), NULL);
260 gst_tag_register_static (GST_TAG_ALBUM_GAIN, GST_TAG_FLAG_META,
261 G_TYPE_DOUBLE, _("replaygain album gain"), _("album gain in db"), NULL);
262 gst_tag_register_static (GST_TAG_ALBUM_PEAK, GST_TAG_FLAG_META,
263 G_TYPE_DOUBLE, _("replaygain album peak"), _("peak of the album"), NULL);
264 gst_tag_register_static (GST_TAG_REFERENCE_LEVEL, GST_TAG_FLAG_META,
265 G_TYPE_DOUBLE, _("replaygain reference level"),
266 _("reference level of track and album gain values"), NULL);
267 gst_tag_register_static (GST_TAG_LANGUAGE_CODE, GST_TAG_FLAG_META,
268 G_TYPE_STRING, _("language code"),
269 _("language code for this stream, conforming to ISO-639-1 or ISO-639-2"),
271 gst_tag_register_static (GST_TAG_LANGUAGE_NAME, GST_TAG_FLAG_META,
272 G_TYPE_STRING, _("language name"),
273 _("freeform name of the language this stream is in"), NULL);
274 gst_tag_register_static (GST_TAG_IMAGE, GST_TAG_FLAG_META, GST_TYPE_SAMPLE,
275 _("image"), _("image related to this stream"), gst_tag_merge_use_first);
276 gst_tag_register_static (GST_TAG_PREVIEW_IMAGE, GST_TAG_FLAG_META,
278 /* TRANSLATORS: 'preview image' = image that shows a preview of the full image */
279 _("preview image"), _("preview image related to this stream"), NULL);
280 gst_tag_register_static (GST_TAG_ATTACHMENT, GST_TAG_FLAG_META,
281 GST_TYPE_SAMPLE, _("attachment"), _("file attached to this stream"),
282 gst_tag_merge_use_first);
283 gst_tag_register_static (GST_TAG_BEATS_PER_MINUTE, GST_TAG_FLAG_META,
284 G_TYPE_DOUBLE, _("beats per minute"),
285 _("number of beats per minute in audio"), NULL);
286 gst_tag_register_static (GST_TAG_KEYWORDS, GST_TAG_FLAG_META, G_TYPE_STRING,
287 _("keywords"), _("comma separated keywords describing the content"),
288 gst_tag_merge_strings_with_comma);
289 gst_tag_register_static (GST_TAG_GEO_LOCATION_NAME, GST_TAG_FLAG_META,
290 G_TYPE_STRING, _("geo location name"),
291 _("human readable descriptive location of where "
292 "the media has been recorded or produced"), NULL);
293 gst_tag_register_static (GST_TAG_GEO_LOCATION_LATITUDE, GST_TAG_FLAG_META,
294 G_TYPE_DOUBLE, _("geo location latitude"),
295 _("geo latitude location of where the media has been recorded or "
296 "produced in degrees according to WGS84 (zero at the equator, "
297 "negative values for southern latitudes)"), NULL);
298 gst_tag_register_static (GST_TAG_GEO_LOCATION_LONGITUDE, GST_TAG_FLAG_META,
299 G_TYPE_DOUBLE, _("geo location longitude"),
300 _("geo longitude location of where the media has been recorded or "
301 "produced in degrees according to WGS84 (zero at the prime meridian "
302 "in Greenwich/UK, negative values for western longitudes)"), NULL);
303 gst_tag_register_static (GST_TAG_GEO_LOCATION_ELEVATION, GST_TAG_FLAG_META,
304 G_TYPE_DOUBLE, _("geo location elevation"),
305 _("geo elevation of where the media has been recorded or produced in "
306 "meters according to WGS84 (zero is average sea level)"), NULL);
307 gst_tag_register_static (GST_TAG_GEO_LOCATION_COUNTRY, GST_TAG_FLAG_META,
308 G_TYPE_STRING, _("geo location country"),
309 _("country (english name) where the media has been recorded "
310 "or produced"), NULL);
311 gst_tag_register_static (GST_TAG_GEO_LOCATION_CITY, GST_TAG_FLAG_META,
312 G_TYPE_STRING, _("geo location city"),
313 _("city (english name) where the media has been recorded "
314 "or produced"), NULL);
315 gst_tag_register_static (GST_TAG_GEO_LOCATION_SUBLOCATION, GST_TAG_FLAG_META,
316 G_TYPE_STRING, _("geo location sublocation"),
317 _("a location whithin a city where the media has been produced "
318 "or created (e.g. the neighborhood)"), NULL);
319 gst_tag_register_static (GST_TAG_GEO_LOCATION_HORIZONTAL_ERROR,
320 GST_TAG_FLAG_META, G_TYPE_DOUBLE, _("geo location horizontal error"),
321 _("expected error of the horizontal positioning measures (in meters)"),
323 gst_tag_register_static (GST_TAG_GEO_LOCATION_MOVEMENT_SPEED,
324 GST_TAG_FLAG_META, G_TYPE_DOUBLE, _("geo location movement speed"),
325 _("movement speed of the capturing device while performing the capture "
327 gst_tag_register_static (GST_TAG_GEO_LOCATION_MOVEMENT_DIRECTION,
328 GST_TAG_FLAG_META, G_TYPE_DOUBLE, _("geo location movement direction"),
329 _("indicates the movement direction of the device performing the capture"
330 " of a media. It is represented as degrees in floating point "
331 "representation, 0 means the geographic north, and increases "
333 gst_tag_register_static (GST_TAG_GEO_LOCATION_CAPTURE_DIRECTION,
334 GST_TAG_FLAG_META, G_TYPE_DOUBLE, _("geo location capture direction"),
335 _("indicates the direction the device is pointing to when capturing "
336 " a media. It is represented as degrees in floating point "
337 " representation, 0 means the geographic north, and increases "
339 gst_tag_register_static (GST_TAG_SHOW_NAME, GST_TAG_FLAG_META, G_TYPE_STRING,
340 /* TRANSLATORS: 'show name' = 'TV/radio/podcast show name' here */
342 _("Name of the tv/podcast/series show the media is from"),
343 gst_tag_merge_strings_with_comma);
344 gst_tag_register_static (GST_TAG_SHOW_SORTNAME, GST_TAG_FLAG_META,
346 /* TRANSLATORS: 'show sortname' = 'TV/radio/podcast show name as used for sorting purposes' here */
348 _("Name of the tv/podcast/series show the media is from, for sorting "
350 gst_tag_register_static (GST_TAG_SHOW_EPISODE_NUMBER, GST_TAG_FLAG_META,
351 G_TYPE_UINT, _("episode number"),
352 _("The episode number in the season the media is part of"),
353 gst_tag_merge_use_first);
354 gst_tag_register_static (GST_TAG_SHOW_SEASON_NUMBER, GST_TAG_FLAG_META,
355 G_TYPE_UINT, _("season number"),
356 _("The season number of the show the media is part of"),
357 gst_tag_merge_use_first);
358 gst_tag_register_static (GST_TAG_LYRICS, GST_TAG_FLAG_META, G_TYPE_STRING,
359 _("lyrics"), _("The lyrics of the media, commonly used for songs"),
360 gst_tag_merge_strings_with_comma);
361 gst_tag_register_static (GST_TAG_COMPOSER_SORTNAME, GST_TAG_FLAG_META,
362 G_TYPE_STRING, _("composer sortname"),
363 _("person(s) who composed the recording, for sorting purposes"), NULL);
364 gst_tag_register_static (GST_TAG_GROUPING, GST_TAG_FLAG_META, G_TYPE_STRING,
366 _("Groups related media that spans multiple tracks, like the different "
367 "pieces of a concerto. It is a higher level than a track, "
368 "but lower than an album"), NULL);
369 gst_tag_register_static (GST_TAG_USER_RATING, GST_TAG_FLAG_META, G_TYPE_UINT,
371 _("Rating attributed by a user. The higher the rank, "
372 "the more the user likes this media"), NULL);
373 gst_tag_register_static (GST_TAG_DEVICE_MANUFACTURER, GST_TAG_FLAG_META,
374 G_TYPE_STRING, _("device manufacturer"),
375 _("Manufacturer of the device used to create this media"), NULL);
376 gst_tag_register_static (GST_TAG_DEVICE_MODEL, GST_TAG_FLAG_META,
377 G_TYPE_STRING, _("device model"),
378 _("Model of the device used to create this media"), NULL);
379 gst_tag_register_static (GST_TAG_APPLICATION_NAME, GST_TAG_FLAG_META,
380 G_TYPE_STRING, _("application name"),
381 _("Application used to create the media"), NULL);
382 gst_tag_register_static (GST_TAG_APPLICATION_DATA, GST_TAG_FLAG_META,
383 GST_TYPE_BUFFER, _("application data"),
384 _("Arbitrary application data to be serialized into the media"), NULL);
385 gst_tag_register_static (GST_TAG_IMAGE_ORIENTATION, GST_TAG_FLAG_META,
386 G_TYPE_STRING, _("image orientation"),
387 _("How the image should be rotated or flipped before display"), NULL);
391 * gst_tag_merge_use_first:
392 * @dest: (out caller-allocates): uninitialized GValue to store result in
393 * @src: GValue to copy from
395 * This is a convenience function for the func argument of gst_tag_register().
396 * It creates a copy of the first value from the list.
399 gst_tag_merge_use_first (GValue * dest, const GValue * src)
401 const GValue *ret = gst_value_list_get_value (src, 0);
403 g_value_init (dest, G_VALUE_TYPE (ret));
404 g_value_copy (ret, dest);
408 * gst_tag_merge_strings_with_comma:
409 * @dest: (out caller-allocates): uninitialized GValue to store result in
410 * @src: GValue to copy from
412 * This is a convenience function for the func argument of gst_tag_register().
413 * It concatenates all given strings using a comma. The tag must be registered
414 * as a G_TYPE_STRING or this function will fail.
417 gst_tag_merge_strings_with_comma (GValue * dest, const GValue * src)
422 count = gst_value_list_get_size (src);
423 str = g_string_new (g_value_get_string (gst_value_list_get_value (src, 0)));
424 for (i = 1; i < count; i++) {
425 /* separator between two strings */
426 g_string_append (str, _(", "));
427 g_string_append (str,
428 g_value_get_string (gst_value_list_get_value (src, i)));
431 g_value_init (dest, G_TYPE_STRING);
432 g_value_take_string (dest, str->str);
433 g_string_free (str, FALSE);
437 gst_tag_lookup (const gchar * tag_name)
442 ret = g_hash_table_lookup (__tags, (gpointer) tag_name);
450 * @name: the name or identifier string
451 * @flag: a flag describing the type of tag info
452 * @type: the type this data is in
453 * @nick: human-readable name
454 * @blurb: a human-readable description about this tag
455 * @func: function for merging multiple values of this tag, or NULL
457 * Registers a new tag type for the use with GStreamer's type system. If a type
458 * with that name is already registered, that one is used.
459 * The old registration may have used a different type however. So don't rely
460 * on your supplied values.
462 * Important: if you do not supply a merge function the implication will be
463 * that there can only be one single value for this tag in a tag list and
464 * any additional values will silenty be discarded when being added (unless
465 * #GST_TAG_MERGE_REPLACE, #GST_TAG_MERGE_REPLACE_ALL, or
466 * #GST_TAG_MERGE_PREPEND is used as merge mode, in which case the new
467 * value will replace the old one in the list).
469 * The merge function will be called from gst_tag_list_copy_value() when
470 * it is required that one or more values for a tag be condensed into
471 * one single value. This may happen from gst_tag_list_get_string(),
472 * gst_tag_list_get_int(), gst_tag_list_get_double() etc. What will happen
473 * exactly in that case depends on how the tag was registered and if a
474 * merge function was supplied and if so which one.
476 * Two default merge functions are provided: gst_tag_merge_use_first() and
477 * gst_tag_merge_strings_with_comma().
480 gst_tag_register (const gchar * name, GstTagFlag flag, GType type,
481 const gchar * nick, const gchar * blurb, GstTagMergeFunc func)
483 g_return_if_fail (name != NULL);
484 g_return_if_fail (nick != NULL);
485 g_return_if_fail (blurb != NULL);
486 g_return_if_fail (type != 0 && type != GST_TYPE_LIST);
488 return gst_tag_register_static (g_intern_string (name), flag, type,
489 g_intern_string (nick), g_intern_string (blurb), func);
493 * gst_tag_register_static:
494 * @name: the name or identifier string (string constant)
495 * @flag: a flag describing the type of tag info
496 * @type: the type this data is in
497 * @nick: human-readable name or short description (string constant)
498 * @blurb: a human-readable description for this tag (string constant)
499 * @func: function for merging multiple values of this tag, or NULL
501 * Registers a new tag type for the use with GStreamer's type system.
503 * Same as gst_tag_register(), but @name, @nick, and @blurb must be
504 * static strings or inlined strings, as they will not be copied. (GStreamer
505 * plugins will be made resident once loaded, so this function can be used
506 * even from dynamically loaded plugins.)
509 gst_tag_register_static (const gchar * name, GstTagFlag flag, GType type,
510 const gchar * nick, const gchar * blurb, GstTagMergeFunc func)
514 g_return_if_fail (name != NULL);
515 g_return_if_fail (nick != NULL);
516 g_return_if_fail (blurb != NULL);
517 g_return_if_fail (type != 0 && type != GST_TYPE_LIST);
519 info = gst_tag_lookup (name);
522 g_return_if_fail (info->type == type);
526 info = g_slice_new (GstTagInfo);
529 info->name_quark = g_quark_from_static_string (name);
532 info->merge_func = func;
535 g_hash_table_insert (__tags, (gpointer) name, info);
541 * @tag: name of the tag
543 * Checks if the given type is already registered.
545 * Returns: TRUE if the type is already registered
548 gst_tag_exists (const gchar * tag)
550 g_return_val_if_fail (tag != NULL, FALSE);
552 return gst_tag_lookup (tag) != NULL;
559 * Gets the #GType used for this tag.
561 * Returns: the #GType of this tag
564 gst_tag_get_type (const gchar * tag)
568 g_return_val_if_fail (tag != NULL, 0);
569 info = gst_tag_lookup (tag);
570 g_return_val_if_fail (info != NULL, 0);
579 * Returns the human-readable name of this tag, You must not change or free
582 * Returns: the human-readable name of this tag
585 gst_tag_get_nick (const gchar * tag)
589 g_return_val_if_fail (tag != NULL, NULL);
590 info = gst_tag_lookup (tag);
591 g_return_val_if_fail (info != NULL, NULL);
597 * gst_tag_get_description:
600 * Returns the human-readable description of this tag, You must not change or
603 * Returns: the human-readable description of this tag
606 gst_tag_get_description (const gchar * tag)
610 g_return_val_if_fail (tag != NULL, NULL);
611 info = gst_tag_lookup (tag);
612 g_return_val_if_fail (info != NULL, NULL);
621 * Gets the flag of @tag.
623 * Returns: the flag of this tag.
626 gst_tag_get_flag (const gchar * tag)
630 g_return_val_if_fail (tag != NULL, GST_TAG_FLAG_UNDEFINED);
631 info = gst_tag_lookup (tag);
632 g_return_val_if_fail (info != NULL, GST_TAG_FLAG_UNDEFINED);
641 * Checks if the given tag is fixed. A fixed tag can only contain one value.
642 * Unfixed tags can contain lists of values.
644 * Returns: TRUE, if the given tag is fixed.
647 gst_tag_is_fixed (const gchar * tag)
651 g_return_val_if_fail (tag != NULL, FALSE);
652 info = gst_tag_lookup (tag);
653 g_return_val_if_fail (info != NULL, FALSE);
655 return info->merge_func == NULL;
658 /* takes ownership of the structure */
660 gst_tag_list_new_internal (GstStructure * s)
662 GstTagList *tag_list;
664 g_assert (s != NULL);
666 tag_list = (GstTagList *) g_slice_new (GstTagListImpl);
668 gst_mini_object_init (GST_MINI_OBJECT_CAST (tag_list), GST_TYPE_TAG_LIST,
669 (GstMiniObjectCopyFunction) __gst_tag_list_copy, NULL,
670 (GstMiniObjectFreeFunction) __gst_tag_list_free);
672 GST_TAG_LIST_STRUCTURE (tag_list) = s;
674 #ifdef DEBUG_REFCOUNT
675 GST_CAT_TRACE (GST_CAT_TAGS, "created taglist %p", tag_list);
682 __gst_tag_list_free (GstTagList * list)
684 g_return_if_fail (GST_IS_TAG_LIST (list));
686 #ifdef DEBUG_REFCOUNT
687 GST_CAT_TRACE (GST_CAT_TAGS, "freeing taglist %p", list);
690 gst_structure_free (GST_TAG_LIST_STRUCTURE (list));
692 g_slice_free1 (sizeof (GstTagListImpl), list);
696 __gst_tag_list_copy (const GstTagList * list)
698 const GstStructure *s;
700 g_return_val_if_fail (GST_IS_TAG_LIST (list), NULL);
702 s = GST_TAG_LIST_STRUCTURE (list);
703 return gst_tag_list_new_internal (gst_structure_copy (s));
707 * gst_tag_list_new_empty:
709 * Creates a new empty GstTagList.
711 * Free-function: gst_tag_list_unref
713 * Returns: (transfer full): An empty tag list
716 gst_tag_list_new_empty (void)
719 GstTagList *tag_list;
721 s = gst_structure_new_id_empty (GST_QUARK (TAGLIST));
722 tag_list = gst_tag_list_new_internal (s);
729 * @...: NULL-terminated list of values to set
731 * Creates a new taglist and appends the values for the given tags. It expects
732 * tag-value pairs like gst_tag_list_add(), and a NULL terminator after the
733 * last pair. The type of the values is implicit and is documented in the API
734 * reference, but can also be queried at runtime with gst_tag_get_type(). It
735 * is an error to pass a value of a type not matching the tag type into this
736 * function. The tag list will make copies of any arguments passed
737 * (e.g. strings, buffers).
739 * Free-function: gst_tag_list_unref
741 * Returns: (transfer full): a new #GstTagList. Free with gst_tag_list_unref()
742 * when no longer needed.
747 gst_tag_list_new (const gchar * tag, ...)
752 g_return_val_if_fail (tag != NULL, NULL);
754 list = gst_tag_list_new_empty ();
755 va_start (args, tag);
756 gst_tag_list_add_valist (list, GST_TAG_MERGE_APPEND, tag, args);
763 * gst_tag_list_new_valist:
764 * @var_args: tag / value pairs to set
766 * Just like gst_tag_list_new(), only that it takes a va_list argument.
767 * Useful mostly for language bindings.
769 * Free-function: gst_tag_list_unref
771 * Returns: (transfer full): a new #GstTagList. Free with gst_tag_list_unref()
772 * when no longer needed.
777 gst_tag_list_new_valist (va_list var_args)
782 list = gst_tag_list_new_empty ();
784 tag = va_arg (var_args, gchar *);
785 gst_tag_list_add_valist (list, GST_TAG_MERGE_APPEND, tag, var_args);
791 * gst_tag_list_to_string:
792 * @list: a #GstTagList
794 * Serializes a tag list to a string.
796 * Returns: a newly-allocated string, or NULL in case of an error. The
797 * string must be freed with g_free() when no longer needed.
802 gst_tag_list_to_string (const GstTagList * list)
804 g_return_val_if_fail (GST_IS_TAG_LIST (list), NULL);
806 return gst_structure_to_string (GST_TAG_LIST_STRUCTURE (list));
810 * gst_tag_list_new_from_string:
811 * @str: a string created with gst_tag_list_to_string()
813 * Deserializes a tag list.
815 * Returns: a new #GstTagList, or NULL in case of an error.
820 gst_tag_list_new_from_string (const gchar * str)
822 GstTagList *tag_list;
824 g_return_val_if_fail (str != NULL, NULL);
825 g_return_val_if_fail (g_str_has_prefix (str, "taglist"), NULL);
827 tag_list = gst_tag_list_new_internal (gst_structure_from_string (str, NULL));
832 * gst_tag_list_n_tags:
833 * @list: A #GstTagList.
835 * Get the number of tags in @list.
837 * Returns: The number of tags in @list.
840 gst_tag_list_n_tags (const GstTagList * list)
842 g_return_val_if_fail (list != NULL, 0);
843 g_return_val_if_fail (GST_IS_TAG_LIST (list), 0);
845 return gst_structure_n_fields (GST_TAG_LIST_STRUCTURE (list));
849 * gst_tag_list_nth_tag_name:
850 * @list: A #GstTagList.
853 * Get the name of the tag in @list at @index.
855 * Returns: The name of the tag at @index.
858 gst_tag_list_nth_tag_name (const GstTagList * list, guint index)
860 g_return_val_if_fail (list != NULL, 0);
861 g_return_val_if_fail (GST_IS_TAG_LIST (list), 0);
863 return gst_structure_nth_field_name (GST_TAG_LIST_STRUCTURE (list), index);
867 * gst_tag_list_is_empty:
868 * @list: A #GstTagList.
870 * Checks if the given taglist is empty.
872 * Returns: TRUE if the taglist is empty, otherwise FALSE.
877 gst_tag_list_is_empty (const GstTagList * list)
879 g_return_val_if_fail (list != NULL, FALSE);
880 g_return_val_if_fail (GST_IS_TAG_LIST (list), FALSE);
882 return (gst_structure_n_fields (GST_TAG_LIST_STRUCTURE (list)) == 0);
886 gst_tag_list_fields_equal (const GValue * value1, const GValue * value2)
890 if (gst_value_compare (value1, value2) == GST_VALUE_EQUAL)
893 /* fields not equal: add some tolerance for doubles, otherwise bail out */
894 if (!G_VALUE_HOLDS_DOUBLE (value1) || !G_VALUE_HOLDS_DOUBLE (value2))
897 d1 = g_value_get_double (value1);
898 d2 = g_value_get_double (value2);
900 /* This will only work for 'normal' values and values around 0,
901 * which should be good enough for our purposes here
902 * FIXME: maybe add this to gst_value_compare_double() ? */
903 return (fabs (d1 - d2) < 0.0000001);
907 * gst_tag_list_is_equal:
908 * @list1: a #GstTagList.
909 * @list2: a #GstTagList.
911 * Checks if the two given taglists are equal.
913 * Returns: TRUE if the taglists are equal, otherwise FALSE
918 gst_tag_list_is_equal (const GstTagList * list1, const GstTagList * list2)
920 const GstStructure *s1, *s2;
921 gint num_fields1, num_fields2, i;
923 g_return_val_if_fail (GST_IS_TAG_LIST (list1), FALSE);
924 g_return_val_if_fail (GST_IS_TAG_LIST (list2), FALSE);
926 /* we don't just use gst_structure_is_equal() here so we can add some
927 * tolerance for doubles, though maybe we should just add that to
928 * gst_value_compare_double() as well? */
929 s1 = GST_TAG_LIST_STRUCTURE (list1);
930 s2 = GST_TAG_LIST_STRUCTURE (list2);
932 num_fields1 = gst_structure_n_fields (s1);
933 num_fields2 = gst_structure_n_fields (s2);
935 if (num_fields1 != num_fields2)
938 for (i = 0; i < num_fields1; i++) {
939 const GValue *value1, *value2;
940 const gchar *tag_name;
942 tag_name = gst_structure_nth_field_name (s1, i);
943 value1 = gst_structure_get_value (s1, tag_name);
944 value2 = gst_structure_get_value (s2, tag_name);
949 if (!gst_tag_list_fields_equal (value1, value2))
959 GstTagMergeMode mode;
964 gst_tag_list_add_value_internal (GstTagList * tag_list, GstTagMergeMode mode,
965 const gchar * tag, const GValue * value, GstTagInfo * info)
967 GstStructure *list = GST_TAG_LIST_STRUCTURE (tag_list);
968 const GValue *value2;
972 info = gst_tag_lookup (tag);
973 if (G_UNLIKELY (info == NULL)) {
974 g_warning ("unknown tag '%s'", tag);
979 tag_quark = info->name_quark;
982 && (value2 = gst_structure_id_get_value (list, tag_quark)) != NULL) {
983 GValue dest = { 0, };
986 case GST_TAG_MERGE_REPLACE_ALL:
987 case GST_TAG_MERGE_REPLACE:
988 gst_structure_id_set_value (list, tag_quark, value);
990 case GST_TAG_MERGE_PREPEND:
991 gst_value_list_merge (&dest, value, value2);
992 gst_structure_id_set_value (list, tag_quark, &dest);
993 g_value_unset (&dest);
995 case GST_TAG_MERGE_APPEND:
996 gst_value_list_merge (&dest, value2, value);
997 gst_structure_id_set_value (list, tag_quark, &dest);
998 g_value_unset (&dest);
1000 case GST_TAG_MERGE_KEEP:
1001 case GST_TAG_MERGE_KEEP_ALL:
1004 g_assert_not_reached ();
1009 case GST_TAG_MERGE_APPEND:
1010 case GST_TAG_MERGE_KEEP:
1011 if (gst_structure_id_get_value (list, tag_quark) != NULL)
1014 case GST_TAG_MERGE_REPLACE_ALL:
1015 case GST_TAG_MERGE_REPLACE:
1016 case GST_TAG_MERGE_PREPEND:
1017 gst_structure_id_set_value (list, tag_quark, value);
1019 case GST_TAG_MERGE_KEEP_ALL:
1022 g_assert_not_reached ();
1029 gst_tag_list_copy_foreach (GQuark tag_quark, const GValue * value,
1032 GstTagCopyData *copy = (GstTagCopyData *) user_data;
1035 tag = g_quark_to_string (tag_quark);
1036 gst_tag_list_add_value_internal (copy->list, copy->mode, tag, value, NULL);
1042 * gst_tag_list_insert:
1043 * @into: list to merge into
1044 * @from: list to merge from
1045 * @mode: the mode to use
1047 * Inserts the tags of the @from list into the first list using the given mode.
1050 gst_tag_list_insert (GstTagList * into, const GstTagList * from,
1051 GstTagMergeMode mode)
1053 GstTagCopyData data;
1055 g_return_if_fail (GST_IS_TAG_LIST (into));
1056 g_return_if_fail (gst_tag_list_is_writable (into));
1057 g_return_if_fail (GST_IS_TAG_LIST (from));
1058 g_return_if_fail (GST_TAG_MODE_IS_VALID (mode));
1062 if (mode == GST_TAG_MERGE_REPLACE_ALL) {
1063 gst_structure_remove_all_fields (GST_TAG_LIST_STRUCTURE (into));
1065 gst_structure_foreach (GST_TAG_LIST_STRUCTURE (from),
1066 gst_tag_list_copy_foreach, &data);
1070 * gst_tag_list_merge:
1071 * @list1: first list to merge
1072 * @list2: second list to merge
1073 * @mode: the mode to use
1075 * Merges the two given lists into a new list. If one of the lists is NULL, a
1076 * copy of the other is returned. If both lists are NULL, NULL is returned.
1078 * Free-function: gst_tag_list_unref
1080 * Returns: (transfer full): the new list
1083 gst_tag_list_merge (const GstTagList * list1, const GstTagList * list2,
1084 GstTagMergeMode mode)
1086 GstTagList *list1_cp;
1087 const GstTagList *list2_cp;
1089 g_return_val_if_fail (list1 == NULL || GST_IS_TAG_LIST (list1), NULL);
1090 g_return_val_if_fail (list2 == NULL || GST_IS_TAG_LIST (list2), NULL);
1091 g_return_val_if_fail (GST_TAG_MODE_IS_VALID (mode), NULL);
1093 /* nothing to merge */
1094 if (!list1 && !list2) {
1098 /* create empty list, we need to do this to correctly handling merge modes */
1099 list1_cp = (list1) ? gst_tag_list_copy (list1) : gst_tag_list_new_empty ();
1100 list2_cp = (list2) ? list2 : gst_tag_list_new_empty ();
1102 gst_tag_list_insert (list1_cp, list2_cp, mode);
1105 gst_tag_list_unref ((GstTagList *) list2_cp);
1111 * gst_tag_list_get_tag_size:
1113 * @tag: the tag to query
1115 * Checks how many value are stored in this tag list for the given tag.
1117 * Returns: The number of tags stored
1120 gst_tag_list_get_tag_size (const GstTagList * list, const gchar * tag)
1122 const GValue *value;
1124 g_return_val_if_fail (GST_IS_TAG_LIST (list), 0);
1126 value = gst_structure_get_value (GST_TAG_LIST_STRUCTURE (list), tag);
1129 if (G_VALUE_TYPE (value) != GST_TYPE_LIST)
1132 return gst_value_list_get_size (value);
1137 * @list: list to set tags in
1138 * @mode: the mode to use
1140 * @...: NULL-terminated list of values to set
1142 * Sets the values for the given tags using the specified mode.
1145 gst_tag_list_add (GstTagList * list, GstTagMergeMode mode, const gchar * tag,
1150 g_return_if_fail (GST_IS_TAG_LIST (list));
1151 g_return_if_fail (gst_tag_list_is_writable (list));
1152 g_return_if_fail (GST_TAG_MODE_IS_VALID (mode));
1153 g_return_if_fail (tag != NULL);
1155 va_start (args, tag);
1156 gst_tag_list_add_valist (list, mode, tag, args);
1161 * gst_tag_list_add_values:
1162 * @list: list to set tags in
1163 * @mode: the mode to use
1165 * @...: GValues to set
1167 * Sets the GValues for the given tags using the specified mode.
1170 gst_tag_list_add_values (GstTagList * list, GstTagMergeMode mode,
1171 const gchar * tag, ...)
1175 g_return_if_fail (GST_IS_TAG_LIST (list));
1176 g_return_if_fail (gst_tag_list_is_writable (list));
1177 g_return_if_fail (GST_TAG_MODE_IS_VALID (mode));
1178 g_return_if_fail (tag != NULL);
1180 va_start (args, tag);
1181 gst_tag_list_add_valist_values (list, mode, tag, args);
1186 * gst_tag_list_add_valist:
1187 * @list: list to set tags in
1188 * @mode: the mode to use
1190 * @var_args: tag / value pairs to set
1192 * Sets the values for the given tags using the specified mode.
1195 gst_tag_list_add_valist (GstTagList * list, GstTagMergeMode mode,
1196 const gchar * tag, va_list var_args)
1199 gchar *error = NULL;
1201 g_return_if_fail (GST_IS_TAG_LIST (list));
1202 g_return_if_fail (gst_tag_list_is_writable (list));
1203 g_return_if_fail (GST_TAG_MODE_IS_VALID (mode));
1204 g_return_if_fail (tag != NULL);
1206 if (mode == GST_TAG_MERGE_REPLACE_ALL) {
1207 gst_structure_remove_all_fields (GST_TAG_LIST_STRUCTURE (list));
1210 while (tag != NULL) {
1211 GValue value = { 0, };
1213 info = gst_tag_lookup (tag);
1214 if (G_UNLIKELY (info == NULL)) {
1215 g_warning ("unknown tag '%s'", tag);
1218 G_VALUE_COLLECT_INIT (&value, info->type, var_args, 0, &error);
1220 g_warning ("%s: %s", G_STRLOC, error);
1222 /* we purposely leak the value here, it might not be
1223 * in a sane state if an error condition occoured
1227 gst_tag_list_add_value_internal (list, mode, tag, &value, info);
1228 g_value_unset (&value);
1229 tag = va_arg (var_args, gchar *);
1234 * gst_tag_list_add_valist_values:
1235 * @list: list to set tags in
1236 * @mode: the mode to use
1238 * @var_args: tag / GValue pairs to set
1240 * Sets the GValues for the given tags using the specified mode.
1243 gst_tag_list_add_valist_values (GstTagList * list, GstTagMergeMode mode,
1244 const gchar * tag, va_list var_args)
1246 g_return_if_fail (GST_IS_TAG_LIST (list));
1247 g_return_if_fail (gst_tag_list_is_writable (list));
1248 g_return_if_fail (GST_TAG_MODE_IS_VALID (mode));
1249 g_return_if_fail (tag != NULL);
1251 if (mode == GST_TAG_MERGE_REPLACE_ALL) {
1252 gst_structure_remove_all_fields (GST_TAG_LIST_STRUCTURE (list));
1255 while (tag != NULL) {
1258 info = gst_tag_lookup (tag);
1259 if (G_UNLIKELY (info == NULL)) {
1260 g_warning ("unknown tag '%s'", tag);
1263 gst_tag_list_add_value_internal (list, mode, tag, va_arg (var_args,
1265 tag = va_arg (var_args, gchar *);
1270 * gst_tag_list_add_value:
1271 * @list: list to set tags in
1272 * @mode: the mode to use
1274 * @value: GValue for this tag
1276 * Sets the GValue for a given tag using the specified mode.
1281 gst_tag_list_add_value (GstTagList * list, GstTagMergeMode mode,
1282 const gchar * tag, const GValue * value)
1284 g_return_if_fail (GST_IS_TAG_LIST (list));
1285 g_return_if_fail (gst_tag_list_is_writable (list));
1286 g_return_if_fail (GST_TAG_MODE_IS_VALID (mode));
1287 g_return_if_fail (tag != NULL);
1289 gst_tag_list_add_value_internal (list, mode, tag, value, NULL);
1293 * gst_tag_list_remove_tag:
1294 * @list: list to remove tag from
1295 * @tag: tag to remove
1297 * Removes the given tag from the taglist.
1300 gst_tag_list_remove_tag (GstTagList * list, const gchar * tag)
1302 g_return_if_fail (GST_IS_TAG_LIST (list));
1303 g_return_if_fail (tag != NULL);
1305 gst_structure_remove_field (GST_TAG_LIST_STRUCTURE (list), tag);
1310 GstTagForeachFunc func;
1311 const GstTagList *tag_list;
1317 structure_foreach_wrapper (GQuark field_id, const GValue * value,
1320 TagForeachData *data = (TagForeachData *) user_data;
1322 data->func (data->tag_list, g_quark_to_string (field_id), data->data);
1327 * gst_tag_list_foreach:
1328 * @list: list to iterate over
1329 * @func: (scope call): function to be called for each tag
1330 * @user_data: (closure): user specified data
1332 * Calls the given function for each tag inside the tag list. Note that if there
1333 * is no tag, the function won't be called at all.
1336 gst_tag_list_foreach (const GstTagList * list, GstTagForeachFunc func,
1339 TagForeachData data;
1341 g_return_if_fail (GST_IS_TAG_LIST (list));
1342 g_return_if_fail (func != NULL);
1345 data.tag_list = list;
1346 data.data = user_data;
1347 gst_structure_foreach (GST_TAG_LIST_STRUCTURE (list),
1348 structure_foreach_wrapper, &data);
1352 * gst_tag_list_get_value_index:
1353 * @list: a #GstTagList
1354 * @tag: tag to read out
1355 * @index: number of entry to read out
1357 * Gets the value that is at the given index for the given tag in the given
1360 * Returns: (transfer none): The GValue for the specified entry or NULL if the
1361 * tag wasn't available or the tag doesn't have as many entries
1364 gst_tag_list_get_value_index (const GstTagList * list, const gchar * tag,
1367 const GValue *value;
1369 g_return_val_if_fail (GST_IS_TAG_LIST (list), NULL);
1370 g_return_val_if_fail (tag != NULL, NULL);
1372 value = gst_structure_get_value (GST_TAG_LIST_STRUCTURE (list), tag);
1376 if (GST_VALUE_HOLDS_LIST (value)) {
1377 if (index >= gst_value_list_get_size (value))
1379 return gst_value_list_get_value (value, index);
1388 * gst_tag_list_copy_value:
1389 * @dest: (out caller-allocates): uninitialized #GValue to copy into
1390 * @list: list to get the tag from
1391 * @tag: tag to read out
1393 * Copies the contents for the given tag into the value,
1394 * merging multiple values into one if multiple values are associated
1396 * You must g_value_unset() the value after use.
1398 * Returns: TRUE, if a value was copied, FALSE if the tag didn't exist in the
1402 gst_tag_list_copy_value (GValue * dest, const GstTagList * list,
1407 g_return_val_if_fail (GST_IS_TAG_LIST (list), FALSE);
1408 g_return_val_if_fail (tag != NULL, FALSE);
1409 g_return_val_if_fail (dest != NULL, FALSE);
1410 g_return_val_if_fail (G_VALUE_TYPE (dest) == 0, FALSE);
1412 src = gst_structure_get_value (GST_TAG_LIST_STRUCTURE (list), tag);
1416 if (G_VALUE_TYPE (src) == GST_TYPE_LIST) {
1417 GstTagInfo *info = gst_tag_lookup (tag);
1422 /* must be there or lists aren't allowed */
1423 g_assert (info->merge_func);
1424 info->merge_func (dest, src);
1426 g_value_init (dest, G_VALUE_TYPE (src));
1427 g_value_copy (src, dest);
1432 /* FIXME 0.11: this whole merge function business is overdesigned, and the
1433 * _get_foo() API is misleading as well - how many application developers will
1434 * expect gst_tag_list_get_string (list, GST_TAG_ARTIST, &val) might return a
1435 * string with multiple comma-separated artists? _get_foo() should just be
1436 * a convenience wrapper around _get_foo_index (list, tag, 0, &val),
1437 * supplemented by a special _tag_list_get_string_merged() function if needed
1438 * (unless someone can actually think of real use cases where the merge
1439 * function is not 'use first' for non-strings and merge for strings) */
1441 /***** evil macros to get all the gst_tag_list_get_*() functions right *****/
1443 #define TAG_MERGE_FUNCS(name,type,ret) \
1445 gst_tag_list_get_ ## name (const GstTagList *list, const gchar *tag, \
1448 GValue v = { 0, }; \
1450 g_return_val_if_fail (GST_IS_TAG_LIST (list), FALSE); \
1451 g_return_val_if_fail (tag != NULL, FALSE); \
1452 g_return_val_if_fail (value != NULL, FALSE); \
1454 if (!gst_tag_list_copy_value (&v, list, tag)) \
1456 *value = COPY_FUNC (g_value_get_ ## name (&v)); \
1457 g_value_unset (&v); \
1462 gst_tag_list_get_ ## name ## _index (const GstTagList *list, \
1464 guint index, type *value) \
1468 g_return_val_if_fail (GST_IS_TAG_LIST (list), FALSE); \
1469 g_return_val_if_fail (tag != NULL, FALSE); \
1470 g_return_val_if_fail (value != NULL, FALSE); \
1472 if ((v = gst_tag_list_get_value_index (list, tag, index)) == NULL) \
1474 *value = COPY_FUNC (g_value_get_ ## name (v)); \
1478 #define COPY_FUNC /**/
1480 * gst_tag_list_get_boolean:
1481 * @list: a #GstTagList to get the tag from
1482 * @tag: tag to read out
1483 * @value: (out): location for the result
1485 * Copies the contents for the given tag into the value, merging multiple values
1486 * into one if multiple values are associated with the tag.
1488 * Returns: TRUE, if a value was copied, FALSE if the tag didn't exist in the
1492 * gst_tag_list_get_boolean_index:
1493 * @list: a #GstTagList to get the tag from
1494 * @tag: tag to read out
1495 * @index: number of entry to read out
1496 * @value: (out): location for the result
1498 * Gets the value that is at the given index for the given tag in the given
1501 * Returns: TRUE, if a value was copied, FALSE if the tag didn't exist in the
1504 TAG_MERGE_FUNCS (boolean, gboolean, TRUE);
1506 * gst_tag_list_get_int:
1507 * @list: a #GstTagList to get the tag from
1508 * @tag: tag to read out
1509 * @value: (out): location for the result
1511 * Copies the contents for the given tag into the value, merging multiple values
1512 * into one if multiple values are associated with the tag.
1514 * Returns: TRUE, if a value was copied, FALSE if the tag didn't exist in the
1518 * gst_tag_list_get_int_index:
1519 * @list: a #GstTagList to get the tag from
1520 * @tag: tag to read out
1521 * @index: number of entry to read out
1522 * @value: (out): location for the result
1524 * Gets the value that is at the given index for the given tag in the given
1527 * Returns: TRUE, if a value was copied, FALSE if the tag didn't exist in the
1530 TAG_MERGE_FUNCS (int, gint, TRUE);
1532 * gst_tag_list_get_uint:
1533 * @list: a #GstTagList to get the tag from
1534 * @tag: tag to read out
1535 * @value: (out): location for the result
1537 * Copies the contents for the given tag into the value, merging multiple values
1538 * into one if multiple values are associated with the tag.
1540 * Returns: TRUE, if a value was copied, FALSE if the tag didn't exist in the
1544 * gst_tag_list_get_uint_index:
1545 * @list: a #GstTagList to get the tag from
1546 * @tag: tag to read out
1547 * @index: number of entry to read out
1548 * @value: (out): location for the result
1550 * Gets the value that is at the given index for the given tag in the given
1553 * Returns: TRUE, if a value was copied, FALSE if the tag didn't exist in the
1556 TAG_MERGE_FUNCS (uint, guint, TRUE);
1558 * gst_tag_list_get_int64_index:
1559 * @list: a #GstTagList to get the tag from
1560 * @tag: tag to read out
1561 * @index: number of entry to read out
1562 * @value: (out): location for the result
1564 * Gets the value that is at the given index for the given tag in the given
1567 * Returns: TRUE, if a value was copied, FALSE if the tag didn't exist in the
1570 TAG_MERGE_FUNCS (int64, gint64, TRUE);
1572 * gst_tag_list_get_uint64:
1573 * @list: a #GstTagList to get the tag from
1574 * @tag: tag to read out
1575 * @value: (out): location for the result
1577 * Copies the contents for the given tag into the value, merging multiple values
1578 * into one if multiple values are associated with the tag.
1580 * Returns: TRUE, if a value was copied, FALSE if the tag didn't exist in the
1584 * gst_tag_list_get_uint64_index:
1585 * @list: a #GstTagList to get the tag from
1586 * @tag: tag to read out
1587 * @index: number of entry to read out
1588 * @value: (out): location for the result
1590 * Gets the value that is at the given index for the given tag in the given
1593 * Returns: TRUE, if a value was copied, FALSE if the tag didn't exist in the
1596 TAG_MERGE_FUNCS (uint64, guint64, TRUE);
1598 * gst_tag_list_get_float:
1599 * @list: a #GstTagList to get the tag from
1600 * @tag: tag to read out
1601 * @value: (out): location for the result
1603 * Copies the contents for the given tag into the value, merging multiple values
1604 * into one if multiple values are associated with the tag.
1606 * Returns: TRUE, if a value was copied, FALSE if the tag didn't exist in the
1610 * gst_tag_list_get_float_index:
1611 * @list: a #GstTagList to get the tag from
1612 * @tag: tag to read out
1613 * @index: number of entry to read out
1614 * @value: (out): location for the result
1616 * Gets the value that is at the given index for the given tag in the given
1619 * Returns: TRUE, if a value was copied, FALSE if the tag didn't exist in the
1622 TAG_MERGE_FUNCS (float, gfloat, TRUE);
1624 * gst_tag_list_get_double:
1625 * @list: a #GstTagList to get the tag from
1626 * @tag: tag to read out
1627 * @value: (out): location for the result
1629 * Copies the contents for the given tag into the value, merging multiple values
1630 * into one if multiple values are associated with the tag.
1632 * Returns: TRUE, if a value was copied, FALSE if the tag didn't exist in the
1636 * gst_tag_list_get_double_index:
1637 * @list: a #GstTagList to get the tag from
1638 * @tag: tag to read out
1639 * @index: number of entry to read out
1640 * @value: (out): location for the result
1642 * Gets the value that is at the given index for the given tag in the given
1645 * Returns: TRUE, if a value was copied, FALSE if the tag didn't exist in the
1648 TAG_MERGE_FUNCS (double, gdouble, TRUE);
1650 * gst_tag_list_get_pointer:
1651 * @list: a #GstTagList to get the tag from
1652 * @tag: tag to read out
1653 * @value: (out) (transfer none): location for the result
1655 * Copies the contents for the given tag into the value, merging multiple values
1656 * into one if multiple values are associated with the tag.
1658 * Returns: TRUE, if a value was copied, FALSE if the tag didn't exist in the
1662 * gst_tag_list_get_pointer_index:
1663 * @list: a #GstTagList to get the tag from
1664 * @tag: tag to read out
1665 * @index: number of entry to read out
1666 * @value: (out) (transfer none): location for the result
1668 * Gets the value that is at the given index for the given tag in the given
1671 * Returns: TRUE, if a value was copied, FALSE if the tag didn't exist in the
1674 TAG_MERGE_FUNCS (pointer, gpointer, (*value != NULL));
1676 static inline gchar *
1677 _gst_strdup0 (const gchar * s)
1679 if (s == NULL || *s == '\0')
1682 return g_strdup (s);
1686 #define COPY_FUNC _gst_strdup0
1689 * gst_tag_list_get_string:
1690 * @list: a #GstTagList to get the tag from
1691 * @tag: tag to read out
1692 * @value: (out callee-allocates) (transfer full): location for the result
1694 * Copies the contents for the given tag into the value, possibly merging
1695 * multiple values into one if multiple values are associated with the tag.
1697 * Use gst_tag_list_get_string_index (list, tag, 0, value) if you want
1698 * to retrieve the first string associated with this tag unmodified.
1700 * The resulting string in @value will be in UTF-8 encoding and should be
1701 * freed by the caller using g_free when no longer needed. Since 0.10.24 the
1702 * returned string is also guaranteed to be non-NULL and non-empty.
1704 * Free-function: g_free
1706 * Returns: TRUE, if a value was copied, FALSE if the tag didn't exist in the
1710 * gst_tag_list_get_string_index:
1711 * @list: a #GstTagList to get the tag from
1712 * @tag: tag to read out
1713 * @index: number of entry to read out
1714 * @value: (out callee-allocates) (transfer full): location for the result
1716 * Gets the value that is at the given index for the given tag in the given
1719 * The resulting string in @value will be in UTF-8 encoding and should be
1720 * freed by the caller using g_free when no longer needed. Since 0.10.24 the
1721 * returned string is also guaranteed to be non-NULL and non-empty.
1723 * Free-function: g_free
1725 * Returns: TRUE, if a value was copied, FALSE if the tag didn't exist in the
1728 TAG_MERGE_FUNCS (string, gchar *, (*value != NULL));
1731 *FIXME 0.11: Instead of _peek (non-copy) and _get (copy), we could have
1732 * _get (non-copy) and _dup (copy) for strings, seems more
1736 * gst_tag_list_peek_string_index:
1737 * @list: a #GstTagList to get the tag from
1738 * @tag: tag to read out
1739 * @index: number of entry to read out
1740 * @value: (out) (transfer none): location for the result
1742 * Peeks at the value that is at the given index for the given tag in the given
1745 * The resulting string in @value will be in UTF-8 encoding and doesn't need
1746 * to be freed by the caller. The returned string is also guaranteed to
1747 * be non-NULL and non-empty.
1749 * Returns: TRUE, if a value was set, FALSE if the tag didn't exist in the
1753 gst_tag_list_peek_string_index (const GstTagList * list,
1754 const gchar * tag, guint index, const gchar ** value)
1758 g_return_val_if_fail (GST_IS_TAG_LIST (list), FALSE);
1759 g_return_val_if_fail (tag != NULL, FALSE);
1760 g_return_val_if_fail (value != NULL, FALSE);
1762 if ((v = gst_tag_list_get_value_index (list, tag, index)) == NULL)
1764 *value = g_value_get_string (v);
1765 return *value != NULL && **value != '\0';
1769 * gst_tag_list_get_date:
1770 * @list: a #GstTagList to get the tag from
1771 * @tag: tag to read out
1772 * @value: (out callee-allocates) (transfer full): address of a GDate pointer
1773 * variable to store the result into
1775 * Copies the first date for the given tag in the taglist into the variable
1776 * pointed to by @value. Free the date with g_date_free() when it is no longer
1779 * Free-function: g_date_free
1781 * Returns: TRUE, if a date was copied, FALSE if the tag didn't exist in the
1782 * given list or if it was #NULL.
1785 gst_tag_list_get_date (const GstTagList * list, const gchar * tag,
1790 g_return_val_if_fail (GST_IS_TAG_LIST (list), FALSE);
1791 g_return_val_if_fail (tag != NULL, FALSE);
1792 g_return_val_if_fail (value != NULL, FALSE);
1794 if (!gst_tag_list_copy_value (&v, list, tag))
1796 *value = (GDate *) g_value_dup_boxed (&v);
1798 return (*value != NULL);
1802 * gst_tag_list_get_date_index:
1803 * @list: a #GstTagList to get the tag from
1804 * @tag: tag to read out
1805 * @index: number of entry to read out
1806 * @value: (out callee-allocates) (transfer full): location for the result
1808 * Gets the date that is at the given index for the given tag in the given
1809 * list and copies it into the variable pointed to by @value. Free the date
1810 * with g_date_free() when it is no longer needed.
1812 * Free-function: g_date_free
1814 * Returns: TRUE, if a value was copied, FALSE if the tag didn't exist in the
1815 * given list or if it was #NULL.
1818 gst_tag_list_get_date_index (const GstTagList * list,
1819 const gchar * tag, guint index, GDate ** value)
1823 g_return_val_if_fail (GST_IS_TAG_LIST (list), FALSE);
1824 g_return_val_if_fail (tag != NULL, FALSE);
1825 g_return_val_if_fail (value != NULL, FALSE);
1827 if ((v = gst_tag_list_get_value_index (list, tag, index)) == NULL)
1829 *value = (GDate *) g_value_dup_boxed (v);
1830 return (*value != NULL);
1834 * gst_tag_list_get_date_time:
1835 * @list: a #GstTagList to get the tag from
1836 * @tag: tag to read out
1837 * @value: (out callee-allocates) (transfer full): address of a #GstDateTime
1838 * pointer variable to store the result into
1840 * Copies the first datetime for the given tag in the taglist into the variable
1841 * pointed to by @value. Unref the date with gst_date_time_unref() when
1842 * it is no longer needed.
1844 * Free-function: gst_date_time_unref
1846 * Returns: TRUE, if a datetime was copied, FALSE if the tag didn't exist in
1847 * thegiven list or if it was #NULL.
1852 gst_tag_list_get_date_time (const GstTagList * list, const gchar * tag,
1853 GstDateTime ** value)
1857 g_return_val_if_fail (GST_IS_TAG_LIST (list), FALSE);
1858 g_return_val_if_fail (tag != NULL, FALSE);
1859 g_return_val_if_fail (value != NULL, FALSE);
1861 if (!gst_tag_list_copy_value (&v, list, tag))
1864 g_return_val_if_fail (GST_VALUE_HOLDS_DATE_TIME (&v), FALSE);
1866 *value = (GstDateTime *) g_value_dup_boxed (&v);
1868 return (*value != NULL);
1872 * gst_tag_list_get_date_time_index:
1873 * @list: a #GstTagList to get the tag from
1874 * @tag: tag to read out
1875 * @index: number of entry to read out
1876 * @value: (out callee-allocates) (transfer full): location for the result
1878 * Gets the datetime that is at the given index for the given tag in the given
1879 * list and copies it into the variable pointed to by @value. Unref the datetime
1880 * with gst_date_time_unref() when it is no longer needed.
1882 * Free-function: gst_date_time_unref
1884 * Returns: TRUE, if a value was copied, FALSE if the tag didn't exist in the
1885 * given list or if it was #NULL.
1890 gst_tag_list_get_date_time_index (const GstTagList * list,
1891 const gchar * tag, guint index, GstDateTime ** value)
1895 g_return_val_if_fail (GST_IS_TAG_LIST (list), FALSE);
1896 g_return_val_if_fail (tag != NULL, FALSE);
1897 g_return_val_if_fail (value != NULL, FALSE);
1899 if ((v = gst_tag_list_get_value_index (list, tag, index)) == NULL)
1901 *value = (GstDateTime *) g_value_dup_boxed (v);
1902 return (*value != NULL);
1906 * gst_tag_list_get_buffer:
1907 * @list: a #GstTagList to get the tag from
1908 * @tag: tag to read out
1909 * @value: (out callee-allocates) (transfer full): address of a GstBuffer
1910 * pointer variable to store the result into
1912 * Copies the first buffer for the given tag in the taglist into the variable
1913 * pointed to by @value. Free the buffer with gst_buffer_unref() when it is
1916 * Free-function: gst_buffer_unref
1918 * Returns: TRUE, if a buffer was copied, FALSE if the tag didn't exist in the
1919 * given list or if it was #NULL.
1924 gst_tag_list_get_buffer (const GstTagList * list, const gchar * tag,
1929 g_return_val_if_fail (GST_IS_TAG_LIST (list), FALSE);
1930 g_return_val_if_fail (tag != NULL, FALSE);
1931 g_return_val_if_fail (value != NULL, FALSE);
1933 if (!gst_tag_list_copy_value (&v, list, tag))
1935 *value = g_value_dup_boxed (&v);
1937 return (*value != NULL);
1941 * gst_tag_list_get_buffer_index:
1942 * @list: a #GstTagList to get the tag from
1943 * @tag: tag to read out
1944 * @index: number of entry to read out
1945 * @value: (out callee-allocates) (transfer full): address of a GstBuffer
1946 * pointer variable to store the result into
1948 * Gets the buffer that is at the given index for the given tag in the given
1949 * list and copies it into the variable pointed to by @value. Free the buffer
1950 * with gst_buffer_unref() when it is no longer needed.
1952 * Free-function: gst_buffer_unref
1954 * Returns: TRUE, if a buffer was copied, FALSE if the tag didn't exist in the
1955 * given list or if it was #NULL.
1960 gst_tag_list_get_buffer_index (const GstTagList * list,
1961 const gchar * tag, guint index, GstBuffer ** value)
1965 g_return_val_if_fail (GST_IS_TAG_LIST (list), FALSE);
1966 g_return_val_if_fail (tag != NULL, FALSE);
1967 g_return_val_if_fail (value != NULL, FALSE);
1969 if ((v = gst_tag_list_get_value_index (list, tag, index)) == NULL)
1971 *value = g_value_dup_boxed (v);
1972 return (*value != NULL);