1 /* GStreamer non-core tag registration and tag utility functions
2 * Copyright (C) 2005 Ross Burton <ross@burtonini.com>
3 * Copyright (C) 2006-2008 Tim-Philipp Müller <tim centricular net>
4 *
5 * This library is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU Library General Public
7 * License as published by the Free Software Foundation; either
8 * version 2 of the License, or (at your option) any later version.
9 *
10 * This library is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * Library General Public License for more details.
14 *
15 * You should have received a copy of the GNU Library General Public
16 * License along with this library; if not, write to the
17 * Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
18 * Boston, MA 02110-1301, USA.
19 */
20
21 #ifdef HAVE_CONFIG_H
22 #include "config.h"
23 #endif
24
25 #include <gst/gst-i18n-plugin.h>
26 #include <gst/base/gsttypefindhelper.h>
27 #include <gst/gst.h>
28 #include "tag.h"
29 #include "id3v2.h"
30
31 #include <string.h>
32
33 /**
34 * SECTION:gsttag
35 * @title: Tags
36 * @short_description: additional tag definitions for plugins and applications
37 * @see_also: #GstTagList
38 *
39 * Contains additional standardized GStreamer tag definitions for plugins
40 * and applications, and functions to register them with the GStreamer
41 * tag system.
42 *
43 */
44
45 #ifndef GST_DISABLE_GST_DEBUG
46 #define GST_CAT_DEFAULT gst_tag_ensure_debug_category()
47
48 static GstDebugCategory *
gst_tag_ensure_debug_category(void)49 gst_tag_ensure_debug_category (void)
50 {
51 static gsize cat_gonce = 0;
52
53 if (g_once_init_enter (&cat_gonce)) {
54 GstDebugCategory *cat = NULL;
55
56 GST_DEBUG_CATEGORY_INIT (cat, "tag-tags", 0, "GstTag helper functions");
57
58 g_once_init_leave (&cat_gonce, (gsize) cat);
59 }
60
61 return (GstDebugCategory *) cat_gonce;
62 }
63 #endif /* GST_DISABLE_GST_DEBUG */
64
65 static gpointer
gst_tag_register_tags_internal(gpointer unused)66 gst_tag_register_tags_internal (gpointer unused)
67 {
68 #ifdef ENABLE_NLS
69 GST_DEBUG ("binding text domain %s to locale dir %s", GETTEXT_PACKAGE,
70 LOCALEDIR);
71 bindtextdomain (GETTEXT_PACKAGE, LOCALEDIR);
72 bind_textdomain_codeset (GETTEXT_PACKAGE, "UTF-8");
73 #endif
74
75 /* musicbrainz tags */
76 gst_tag_register_static (GST_TAG_MUSICBRAINZ_TRACKID, GST_TAG_FLAG_META,
77 G_TYPE_STRING, _("track ID"), _("MusicBrainz track ID"), NULL);
78 gst_tag_register_static (GST_TAG_MUSICBRAINZ_ARTISTID, GST_TAG_FLAG_META,
79 G_TYPE_STRING, _("artist ID"), _("MusicBrainz artist ID"), NULL);
80 gst_tag_register_static (GST_TAG_MUSICBRAINZ_ALBUMID, GST_TAG_FLAG_META,
81 G_TYPE_STRING, _("album ID"), _("MusicBrainz album ID"), NULL);
82 gst_tag_register_static (GST_TAG_MUSICBRAINZ_ALBUMARTISTID, GST_TAG_FLAG_META,
83 G_TYPE_STRING,
84 _("album artist ID"), _("MusicBrainz album artist ID"), NULL);
85 gst_tag_register_static (GST_TAG_MUSICBRAINZ_RELEASEGROUPID,
86 GST_TAG_FLAG_META, G_TYPE_STRING, _("release group ID"),
87 _("MusicBrainz release group ID"), NULL);
88 gst_tag_register_static (GST_TAG_MUSICBRAINZ_RELEASETRACKID,
89 GST_TAG_FLAG_META, G_TYPE_STRING, _("release track ID"),
90 _("MusicBrainz release track ID"), NULL);
91 gst_tag_register_static (GST_TAG_MUSICBRAINZ_TRMID, GST_TAG_FLAG_META,
92 G_TYPE_STRING, _("track TRM ID"), _("MusicBrainz TRM ID"), NULL);
93 gst_tag_register_static (GST_TAG_ACOUSTID_ID, GST_TAG_FLAG_META,
94 G_TYPE_STRING, _("AcoustID ID"), _("AcoustID ID"), NULL);
95 gst_tag_register_static (GST_TAG_ACOUSTID_FINGERPRINT,
96 GST_TAG_FLAG_META, G_TYPE_STRING, _("AcoustID fingerprint (chromaprint)"),
97 _("AcoustID fingerprint (chromaprint)"), NULL);
98
99 /* CDDA tags */
100 gst_tag_register_static (GST_TAG_CDDA_CDDB_DISCID, GST_TAG_FLAG_META,
101 G_TYPE_STRING, "discid", "CDDB discid for metadata retrieval",
102 gst_tag_merge_use_first);
103
104 gst_tag_register_static (GST_TAG_CDDA_CDDB_DISCID_FULL, GST_TAG_FLAG_META,
105 G_TYPE_STRING, "discid full",
106 "CDDB discid for metadata retrieval (full)", gst_tag_merge_use_first);
107
108 gst_tag_register_static (GST_TAG_CDDA_MUSICBRAINZ_DISCID, GST_TAG_FLAG_META,
109 G_TYPE_STRING, "musicbrainz-discid",
110 "Musicbrainz discid for metadata retrieval", gst_tag_merge_use_first);
111
112 gst_tag_register_static (GST_TAG_CDDA_MUSICBRAINZ_DISCID_FULL,
113 GST_TAG_FLAG_META, G_TYPE_STRING, "musicbrainz-discid-full",
114 "Musicbrainz discid for metadata retrieval (full)",
115 gst_tag_merge_use_first);
116
117 /* photography tags */
118 gst_tag_register_static (GST_TAG_CAPTURING_SHUTTER_SPEED, GST_TAG_FLAG_META,
119 GST_TYPE_FRACTION, _("capturing shutter speed"),
120 _("Shutter speed used when capturing an image, in seconds"), NULL);
121
122 gst_tag_register_static (GST_TAG_CAPTURING_FOCAL_RATIO, GST_TAG_FLAG_META,
123 G_TYPE_DOUBLE, _("capturing focal ratio"),
124 _("Focal ratio (f-number) used when capturing the image"), NULL);
125
126 gst_tag_register_static (GST_TAG_CAPTURING_FOCAL_LENGTH, GST_TAG_FLAG_META,
127 G_TYPE_DOUBLE, _("capturing focal length"),
128 _("Focal length of the lens used capturing the image, in mm"), NULL);
129
130 gst_tag_register_static (GST_TAG_CAPTURING_FOCAL_LENGTH_35_MM,
131 GST_TAG_FLAG_META, G_TYPE_DOUBLE,
132 _("capturing 35 mm equivalent focal length"),
133 _("35 mm equivalent focal length of the lens used capturing the image, "
134 "in mm"), NULL);
135
136 gst_tag_register_static (GST_TAG_CAPTURING_DIGITAL_ZOOM_RATIO,
137 GST_TAG_FLAG_META, G_TYPE_DOUBLE, _("capturing digital zoom ratio"),
138 _("Digital zoom ratio used when capturing an image"), NULL);
139
140 gst_tag_register_static (GST_TAG_CAPTURING_ISO_SPEED, GST_TAG_FLAG_META,
141 G_TYPE_INT, _("capturing iso speed"),
142 _("The ISO speed used when capturing an image"), NULL);
143
144 gst_tag_register_static (GST_TAG_CAPTURING_EXPOSURE_PROGRAM,
145 GST_TAG_FLAG_META, G_TYPE_STRING, _("capturing exposure program"),
146 _("The exposure program used when capturing an image"), NULL);
147
148 gst_tag_register_static (GST_TAG_CAPTURING_EXPOSURE_MODE, GST_TAG_FLAG_META,
149 G_TYPE_STRING, _("capturing exposure mode"),
150 _("The exposure mode used when capturing an image"), NULL);
151
152 gst_tag_register_static (GST_TAG_CAPTURING_EXPOSURE_COMPENSATION,
153 GST_TAG_FLAG_META, G_TYPE_DOUBLE, _("capturing exposure compensation"),
154 _("The exposure compensation used when capturing an image"), NULL);
155
156 gst_tag_register_static (GST_TAG_CAPTURING_SCENE_CAPTURE_TYPE,
157 GST_TAG_FLAG_META, G_TYPE_STRING, _("capturing scene capture type"),
158 _("The scene capture mode used when capturing an image"), NULL);
159
160 gst_tag_register_static (GST_TAG_CAPTURING_GAIN_ADJUSTMENT, GST_TAG_FLAG_META,
161 G_TYPE_STRING, _("capturing gain adjustment"),
162 _("The overall gain adjustment applied on an image"), NULL);
163
164 gst_tag_register_static (GST_TAG_CAPTURING_WHITE_BALANCE, GST_TAG_FLAG_META,
165 G_TYPE_STRING, _("capturing white balance"),
166 _("The white balance mode set when capturing an image"), NULL);
167
168 gst_tag_register_static (GST_TAG_CAPTURING_CONTRAST, GST_TAG_FLAG_META,
169 G_TYPE_STRING, _("capturing contrast"),
170 _("The direction of contrast processing applied "
171 "when capturing an image"), NULL);
172
173 gst_tag_register_static (GST_TAG_CAPTURING_SATURATION, GST_TAG_FLAG_META,
174 G_TYPE_STRING, _("capturing saturation"),
175 _("The direction of saturation processing applied when "
176 "capturing an image"), NULL);
177
178 gst_tag_register_static (GST_TAG_CAPTURING_SHARPNESS, GST_TAG_FLAG_META,
179 G_TYPE_STRING, _("capturing sharpness"),
180 _("The direction of sharpness processing applied "
181 "when capturing an image"), NULL);
182
183 gst_tag_register_static (GST_TAG_CAPTURING_FLASH_FIRED, GST_TAG_FLAG_META,
184 G_TYPE_BOOLEAN, _("capturing flash fired"),
185 _("If the flash fired while capturing an image"), NULL);
186
187 gst_tag_register_static (GST_TAG_CAPTURING_FLASH_MODE, GST_TAG_FLAG_META,
188 G_TYPE_STRING, _("capturing flash mode"),
189 _("The selected flash mode while capturing an image"), NULL);
190
191 gst_tag_register_static (GST_TAG_CAPTURING_METERING_MODE, GST_TAG_FLAG_META,
192 G_TYPE_STRING, _("capturing metering mode"),
193 _("The metering mode used while determining exposure for capturing an"
194 " image"), NULL);
195
196 gst_tag_register_static (GST_TAG_CAPTURING_SOURCE, GST_TAG_FLAG_META,
197 G_TYPE_STRING, _("capturing source"),
198 _("The source or type of device used for the capture"), NULL);
199
200 gst_tag_register_static (GST_TAG_IMAGE_HORIZONTAL_PPI, GST_TAG_FLAG_META,
201 G_TYPE_DOUBLE, _("image horizontal ppi"),
202 _("Media (image/video) intended horizontal pixel density in ppi"), NULL);
203
204 gst_tag_register_static (GST_TAG_IMAGE_VERTICAL_PPI, GST_TAG_FLAG_META,
205 G_TYPE_DOUBLE, _("image vertical ppi"),
206 _("Media (image/video) intended vertical pixel density in ppi"), NULL);
207
208 gst_tag_register_static (GST_TAG_ID3V2_FRAME, GST_TAG_FLAG_META,
209 GST_TYPE_SAMPLE, _("ID3v2 frame"), _("unparsed id3v2 tag frame"),
210 gst_tag_merge_use_first);
211
212 gst_tag_register_static (GST_TAG_MUSICAL_KEY, GST_TAG_FLAG_META,
213 G_TYPE_STRING, _("musical-key"), _("Initial key in which the "
214 "sound starts"), gst_tag_merge_use_first);
215
216 return NULL;
217 }
218
219 /* FIXME 0.11: rename this to gst_tag_init() or gst_tag_register_tags() or
220 * even better: make tags auto-register themselves, either by defining them
221 * to a wrapper func that does the initing, or by adding tag factories so
222 * that the core can load+register tags automatically when needed. */
223
224 /**
225 * gst_tag_register_musicbrainz_tags:
226 *
227 * Registers additional musicbrainz-specific tags with the GStreamer tag
228 * system. Plugins and applications that use these tags should call this
229 * function before using them. Can be called multiple times.
230 */
231 void
gst_tag_register_musicbrainz_tags(void)232 gst_tag_register_musicbrainz_tags (void)
233 {
234 static GOnce mb_once = G_ONCE_INIT;
235
236 g_once (&mb_once, gst_tag_register_tags_internal, NULL);
237 }
238
239 static inline gboolean
gst_tag_image_type_is_valid(GstTagImageType type)240 gst_tag_image_type_is_valid (GstTagImageType type)
241 {
242 GEnumClass *klass;
243
244 gboolean res;
245
246 klass = g_type_class_ref (gst_tag_image_type_get_type ());
247 res = (g_enum_get_value (klass, type) != NULL);
248 g_type_class_unref (klass);
249
250 return res;
251 }
252
253 /**
254 * gst_tag_parse_extended_comment:
255 * @ext_comment: an extended comment string, see #GST_TAG_EXTENDED_COMMENT
256 * @key: (out) (nullable):
257 * return location for the comment description key, or NULL
258 * @lang: (out) (nullable):
259 * return location for the comment ISO-639 language code, or NULL
260 * @value: (out): return location for the actual comment string, or NULL
261 * @fail_if_no_key: whether to fail if strings are not in key=value form
262 *
263 * Convenience function to parse a GST_TAG_EXTENDED_COMMENT string and
264 * separate it into its components.
265 *
266 * If successful, @key, @lang and/or @value will be set to newly allocated
267 * strings that you need to free with g_free() when done. @key and @lang
268 * may also be set to NULL by this function if there is no key or no language
269 * code in the extended comment string.
270 *
271 * Returns: TRUE if the string could be parsed, otherwise FALSE
272 */
273 gboolean
gst_tag_parse_extended_comment(const gchar * ext_comment,gchar ** key,gchar ** lang,gchar ** value,gboolean fail_if_no_key)274 gst_tag_parse_extended_comment (const gchar * ext_comment, gchar ** key,
275 gchar ** lang, gchar ** value, gboolean fail_if_no_key)
276 {
277 const gchar *div, *bop, *bcl;
278
279 g_return_val_if_fail (ext_comment != NULL, FALSE);
280 g_return_val_if_fail (g_utf8_validate (ext_comment, -1, NULL), FALSE);
281
282 if (key)
283 *key = NULL;
284 if (lang)
285 *lang = NULL;
286
287 div = strchr (ext_comment, '=');
288 bop = strchr (ext_comment, '[');
289 bcl = strchr (ext_comment, ']');
290
291 if (div == NULL) {
292 if (fail_if_no_key)
293 return FALSE;
294 if (value)
295 *value = g_strdup (ext_comment);
296 return TRUE;
297 }
298
299 if (bop != NULL && bop < div) {
300 if (bcl < bop || bcl > div)
301 return FALSE;
302 if (key)
303 *key = g_strndup (ext_comment, bop - ext_comment);
304 if (lang)
305 *lang = g_strndup (bop + 1, bcl - bop - 1);
306 } else {
307 if (key)
308 *key = g_strndup (ext_comment, div - ext_comment);
309 }
310
311 if (value)
312 *value = g_strdup (div + 1);
313
314 return TRUE;
315 }
316
317 /**
318 * gst_tag_freeform_string_to_utf8:
319 * @data: (array length=size) (element-type gchar): string data
320 * @size: length of string data, or -1 if the string is NUL-terminated
321 * @env_vars: (array zero-terminated=1)
322 * a NULL-terminated string array of environment variable names, or NULL
323 *
324 * Convenience function to read a string with unknown character encoding. If
325 * the string is already in UTF-8 encoding, it will be returned right away.
326 * If not it tries to detect byte-order-mark for UTF-16/32 cases and use that.
327 * Otherwise, the environment will be searched for a number of environment
328 * variables (whose names are specified in the NULL-terminated string array
329 * @env_vars) containing a list of character encodings to try/use. If none
330 * are specified, the current locale will be tried. If that also doesn't work,
331 * WINDOWS-1252/ISO-8859-1 is assumed (which will almost always succeed).
332 *
333 * Returns: a newly-allocated string in UTF-8 encoding, or NULL
334 */
335 gchar *
gst_tag_freeform_string_to_utf8(const gchar * data,gint size,const gchar ** env_vars)336 gst_tag_freeform_string_to_utf8 (const gchar * data, gint size,
337 const gchar ** env_vars)
338 {
339 const gchar *cur_loc = NULL;
340
341 gsize bytes_read;
342
343 gchar *utf8 = NULL;
344
345 g_return_val_if_fail (data != NULL, NULL);
346
347 if (size < 0)
348 size = strlen (data);
349
350 /* chop off trailing string terminators to make sure utf8_validate doesn't
351 * get to see them (since that would make the utf8 check fail) */
352 while (size > 0 && data[size - 1] == '\0')
353 --size;
354
355 /* Should we try the charsets specified
356 * via environment variables FIRST ? */
357 if (g_utf8_validate (data, size, NULL)) {
358 utf8 = g_strndup (data, size);
359 GST_LOG ("String '%s' is valid UTF-8 already", utf8);
360 goto beach;
361 }
362
363 /* check for and use byte-order-mark for UTF-16/32 cases */
364 if (size >= 2) {
365 const gchar *c = NULL;
366 gint prefix, ssize;
367
368 if (size >= 4) {
369 prefix = 4;
370 ssize = GST_ROUND_DOWN_4 (size - 4);
371 switch (GST_READ_UINT32_BE (data)) {
372 case 0x0000FEFF:
373 c = "UTF-32BE";
374 break;
375 case 0xFFFE0000:
376 c = "UTF-32LE";
377 break;
378 default:
379 break;
380 }
381 }
382 if (!c) {
383 prefix = 2;
384 ssize = GST_ROUND_DOWN_2 (size - 2);
385 switch (GST_READ_UINT16_BE (data)) {
386 case 0xFEFF:
387 c = "UTF-16BE";
388 break;
389 case 0xFFFE:
390 c = "UTF-16LE";
391 break;
392 default:
393 break;
394 }
395 }
396 if (c) {
397 GST_LOG ("Trying to convert freeform string to UTF-8 from '%s'", c);
398 if ((utf8 =
399 g_convert (data + prefix, ssize, "UTF-8", c, &bytes_read, NULL,
400 NULL))) {
401 if (bytes_read == ssize)
402 goto beach;
403 g_free (utf8);
404 utf8 = NULL;
405 }
406 }
407 }
408
409 while (env_vars && *env_vars != NULL) {
410 const gchar *env = NULL;
411
412 /* Try charsets specified via the environment */
413 env = g_getenv (*env_vars);
414 if (env != NULL && *env != '\0') {
415 gchar **c, **csets;
416
417 csets = g_strsplit (env, G_SEARCHPATH_SEPARATOR_S, -1);
418
419 for (c = csets; c && *c; ++c) {
420 GST_LOG ("Trying to convert freeform string to UTF-8 from '%s'", *c);
421 if ((utf8 =
422 g_convert (data, size, "UTF-8", *c, &bytes_read, NULL, NULL))) {
423 if (bytes_read == size) {
424 g_strfreev (csets);
425 goto beach;
426 }
427 g_free (utf8);
428 utf8 = NULL;
429 }
430 }
431
432 g_strfreev (csets);
433 }
434 ++env_vars;
435 }
436
437 /* Try current locale (if not UTF-8) */
438 if (!g_get_charset (&cur_loc)) {
439 GST_LOG ("Trying to convert freeform string using locale ('%s')", cur_loc);
440 if ((utf8 = g_locale_to_utf8 (data, size, &bytes_read, NULL, NULL))) {
441 if (bytes_read == size) {
442 goto beach;
443 }
444 g_free (utf8);
445 utf8 = NULL;
446 }
447 }
448
449 /* Try Windows-1252 (which is a superset of ISO 8859-1 that uses a control
450 * character range in ISO 8859-1 for more printable characters) */
451 {
452 GError *err = NULL;
453
454 GST_LOG ("Trying to convert freeform string using Windows-1252/ISO-8859-1 "
455 "fallback");
456 utf8 = g_convert (data, size, "UTF-8", "WINDOWS-1252", &bytes_read, NULL,
457 &err);
458 if (err != NULL) {
459 /* fallback in case iconv implementation doesn't support windows-1252
460 * for some reason */
461 if (err->code == G_CONVERT_ERROR_NO_CONVERSION) {
462 g_free (utf8);
463 utf8 = g_convert (data, size, "UTF-8", "ISO-8859-1", &bytes_read,
464 NULL, NULL);
465 }
466 g_error_free (err);
467 }
468
469 if (utf8 != NULL && bytes_read == size)
470 goto beach;
471 }
472
473 g_free (utf8);
474 return NULL;
475
476 beach:
477
478 g_strchomp (utf8);
479 if (utf8 && utf8[0] != '\0') {
480 GST_LOG ("Returning '%s'", utf8);
481 return utf8;
482 }
483
484 g_free (utf8);
485 return NULL;
486 }
487
488 /**
489 * gst_tag_image_data_to_image_sample:
490 * @image_data: (array length=image_data_len): the (encoded) image
491 * @image_data_len: the length of the encoded image data at @image_data
492 * @image_type: type of the image, or #GST_TAG_IMAGE_TYPE_UNDEFINED. Pass
493 * #GST_TAG_IMAGE_TYPE_NONE if no image type should be set at all (e.g.
494 * for preview images)
495 *
496 * Helper function for tag-reading plugins to create a #GstSample suitable to
497 * add to a #GstTagList as an image tag (such as #GST_TAG_IMAGE or
498 * #GST_TAG_PREVIEW_IMAGE) from the encoded image data and an (optional) image
499 * type.
500 *
501 * Background: cover art and other images in tags are usually stored as a
502 * blob of binary image data, often accompanied by a MIME type or some other
503 * content type string (e.g. 'png', 'jpeg', 'jpg'). Sometimes there is also an
504 * 'image type' to indicate what kind of image this is (e.g. front cover,
505 * back cover, artist, etc.). The image data may also be an URI to the image
506 * rather than the image itself.
507 *
508 * In GStreamer, image tags are #GstSample<!-- -->s containing the raw image
509 * data, with the sample caps describing the content type of the image
510 * (e.g. image/jpeg, image/png, text/uri-list). The sample info may contain
511 * an additional 'image-type' field of #GstTagImageType to describe
512 * the type of image (front cover, back cover etc.). #GST_TAG_PREVIEW_IMAGE
513 * tags should not carry an image type, their type is already indicated via
514 * the special tag name.
515 *
516 * This function will do various checks and typefind the encoded image
517 * data (we can't trust the declared mime type).
518 *
519 * Returns: a newly-allocated image sample for use in tag lists, or NULL
520 */
521 GstSample *
gst_tag_image_data_to_image_sample(const guint8 * image_data,guint image_data_len,GstTagImageType image_type)522 gst_tag_image_data_to_image_sample (const guint8 * image_data,
523 guint image_data_len, GstTagImageType image_type)
524 {
525 const gchar *name;
526 GstBuffer *image;
527 GstSample *sample;
528 GstCaps *caps;
529 GstMapInfo info;
530 GstStructure *image_info = NULL;
531
532 g_return_val_if_fail (image_data != NULL, NULL);
533 g_return_val_if_fail (image_data_len > 0, NULL);
534 g_return_val_if_fail (gst_tag_image_type_is_valid (image_type), NULL);
535
536 GST_DEBUG ("image data len: %u bytes", image_data_len);
537
538 /* allocate space for a NUL terminator for an uri too */
539 image = gst_buffer_new_and_alloc (image_data_len + 1);
540 if (image == NULL)
541 goto alloc_failed;
542
543 gst_buffer_map (image, &info, GST_MAP_WRITE);
544 memcpy (info.data, image_data, image_data_len);
545 info.data[image_data_len] = '\0';
546 gst_buffer_unmap (image, &info);
547
548 /* Find GStreamer media type, can't trust declared type */
549 caps = gst_type_find_helper_for_buffer (NULL, image, NULL);
550
551 if (caps == NULL)
552 goto no_type;
553
554 GST_DEBUG ("Found GStreamer media type: %" GST_PTR_FORMAT, caps);
555
556 /* sanity check: make sure typefound/declared caps are either URI or image */
557 name = gst_structure_get_name (gst_caps_get_structure (caps, 0));
558
559 if (!g_str_has_prefix (name, "image/") &&
560 !g_str_has_prefix (name, "video/") &&
561 !g_str_equal (name, "text/uri-list")) {
562 GST_DEBUG ("Unexpected image type '%s', ignoring image frame", name);
563 goto error;
564 }
565
566 /* Decrease size by 1 if we don't have an URI list
567 * to keep the original size of the image
568 */
569 if (!g_str_equal (name, "text/uri-list"))
570 gst_buffer_set_size (image, image_data_len);
571
572 if (image_type != GST_TAG_IMAGE_TYPE_NONE) {
573 GST_LOG ("Setting image type: %d", image_type);
574 image_info = gst_structure_new ("GstTagImageInfo",
575 "image-type", GST_TYPE_TAG_IMAGE_TYPE, image_type, NULL);
576 }
577 sample = gst_sample_new (image, caps, NULL, image_info);
578 gst_buffer_unref (image);
579 gst_caps_unref (caps);
580
581 return sample;
582
583 /* ERRORS */
584 no_type:
585 {
586 GST_DEBUG ("Could not determine GStreamer media type, ignoring image");
587 /* fall through */
588 }
589 error:
590 {
591 if (image)
592 gst_buffer_unref (image);
593 if (caps)
594 gst_caps_unref (caps);
595 return NULL;
596 }
597 alloc_failed:
598 {
599 GST_WARNING ("failed to allocate buffer of %d for image", image_data_len);
600 gst_buffer_unref (image);
601 return NULL;
602 }
603
604 }
605