1 /* GStreamer
2 * Copyright (C) 2013 Collabora Ltd.
3 * Author: Sebastian Dröge <sebastian.droege@collabora.co.uk>
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 /**
22 * SECTION:gstcapsfeatures
23 * @title: GstCapsFeatures
24 * @short_description: A set of features in caps
25 * @see_also: #GstCaps
26 *
27 * #GstCapsFeatures can optionally be set on a #GstCaps to add requirements
28 * for additional features for a specific #GstStructure. Caps structures with
29 * the same name but with a non-equal set of caps features are not compatible.
30 * If a pad supports multiple sets of features it has to add multiple equal
31 * structures with different feature sets to the caps.
32 *
33 * Empty #GstCapsFeatures are equivalent with the #GstCapsFeatures that only
34 * contain #GST_CAPS_FEATURE_MEMORY_SYSTEM_MEMORY. ANY #GstCapsFeatures as
35 * created by gst_caps_features_new_any() are equal to any other #GstCapsFeatures
36 * and can be used to specify that any #GstCapsFeatures would be supported, e.g.
37 * for elements that don't touch buffer memory. #GstCaps with ANY #GstCapsFeatures
38 * are considered non-fixed and during negotiation some #GstCapsFeatures have
39 * to be selected.
40 *
41 * Examples for caps features would be the requirement of a specific #GstMemory
42 * types or the requirement of having a specific #GstMeta on the buffer. Features
43 * are given as a string of the format "memory:GstMemoryTypeName" or
44 * "meta:GstMetaAPIName".
45 *
46 * Since: 1.2
47 */
48
49 #ifdef HAVE_CONFIG_H
50 #include "config.h"
51 #endif
52
53 #include <string.h>
54 #include "gst_private.h"
55 #include "gstcapsfeatures.h"
56 #include <gst/gst.h>
57
58 GST_DEBUG_CATEGORY_STATIC (gst_caps_features_debug);
59 #define GST_CAT_DEFAULT gst_caps_features_debug
60
61 struct _GstCapsFeatures
62 {
63 GType type;
64 gint *parent_refcount;
65 GArray *array;
66 gboolean is_any;
67 };
68
69 GType _gst_caps_features_type = 0;
70 static gint static_caps_features_parent_refcount = G_MAXINT;
71 GstCapsFeatures *_gst_caps_features_any = NULL;
72 GstCapsFeatures *_gst_caps_features_memory_system_memory = NULL;
73 static GQuark _gst_caps_feature_memory_system_memory = 0;
74
75 G_DEFINE_BOXED_TYPE (GstCapsFeatures, gst_caps_features,
76 gst_caps_features_copy, gst_caps_features_free);
77
78 #define IS_MUTABLE(features) \
79 (!features->parent_refcount || \
80 g_atomic_int_get (features->parent_refcount) == 1)
81
82 static void
83 gst_caps_features_transform_to_string (const GValue * src_value,
84 GValue * dest_value);
85
86 void
_priv_gst_caps_features_initialize(void)87 _priv_gst_caps_features_initialize (void)
88 {
89 GST_DEBUG_CATEGORY_INIT (gst_caps_features_debug, "caps-features", 0,
90 "GstCapsFeatures debug");
91
92 _gst_caps_features_type = gst_caps_features_get_type ();
93 _gst_caps_feature_memory_system_memory =
94 g_quark_from_static_string (GST_CAPS_FEATURE_MEMORY_SYSTEM_MEMORY);
95
96 g_value_register_transform_func (_gst_caps_features_type, G_TYPE_STRING,
97 gst_caps_features_transform_to_string);
98
99 _gst_caps_features_any = gst_caps_features_new_any ();
100 gst_caps_features_set_parent_refcount (_gst_caps_features_any,
101 &static_caps_features_parent_refcount);
102 _gst_caps_features_memory_system_memory =
103 gst_caps_features_new_id (_gst_caps_feature_memory_system_memory, 0);
104 gst_caps_features_set_parent_refcount
105 (_gst_caps_features_memory_system_memory,
106 &static_caps_features_parent_refcount);
107 }
108
109 void
_priv_gst_caps_features_cleanup(void)110 _priv_gst_caps_features_cleanup (void)
111 {
112 gst_caps_features_set_parent_refcount (_gst_caps_features_any, NULL);
113 gst_caps_features_free (_gst_caps_features_any);
114 _gst_caps_features_any = NULL;
115 gst_caps_features_set_parent_refcount
116 (_gst_caps_features_memory_system_memory, NULL);
117 gst_caps_features_free (_gst_caps_features_memory_system_memory);
118 _gst_caps_features_memory_system_memory = NULL;
119 }
120
121 gboolean
gst_is_caps_features(gconstpointer obj)122 gst_is_caps_features (gconstpointer obj)
123 {
124 const GstCapsFeatures *features = obj;
125
126 return (obj != NULL && features->type == _gst_caps_features_type);
127 }
128
129 static gboolean
gst_caps_feature_name_is_valid(const gchar * feature)130 gst_caps_feature_name_is_valid (const gchar * feature)
131 {
132 #ifndef G_DISABLE_CHECKS
133 while (TRUE) {
134 if (g_ascii_isalpha (*feature))
135 feature++;
136 else if (*feature == ':')
137 break;
138 else
139 return FALSE;
140 }
141
142 if (*feature != ':')
143 return FALSE;
144
145 feature++;
146 if (*feature == '\0' || !g_ascii_isalpha (*feature))
147 return FALSE;
148
149 while (TRUE) {
150 if (g_ascii_isalnum (*feature))
151 feature++;
152 else if (*feature == '\0')
153 break;
154 else
155 return FALSE;
156 }
157 #endif
158
159 return TRUE;
160 }
161
162 /**
163 * gst_caps_features_new_empty:
164 *
165 * Creates a new, empty #GstCapsFeatures.
166 *
167 * Free-function: gst_caps_features_free
168 *
169 * Returns: (transfer full): a new, empty #GstCapsFeatures
170 *
171 * Since: 1.2
172 */
173 GstCapsFeatures *
gst_caps_features_new_empty(void)174 gst_caps_features_new_empty (void)
175 {
176 GstCapsFeatures *features;
177
178 features = g_slice_new (GstCapsFeatures);
179 features->type = _gst_caps_features_type;
180 features->parent_refcount = NULL;
181 features->array = g_array_new (FALSE, FALSE, sizeof (GQuark));
182 features->is_any = FALSE;
183
184 GST_TRACE ("created caps features %p", features);
185
186 return features;
187 }
188
189 /**
190 * gst_caps_features_new_any:
191 *
192 * Creates a new, ANY #GstCapsFeatures. This will be equal
193 * to any other #GstCapsFeatures but caps with these are
194 * unfixed.
195 *
196 * Free-function: gst_caps_features_free
197 *
198 * Returns: (transfer full): a new, ANY #GstCapsFeatures
199 *
200 * Since: 1.2
201 */
202 GstCapsFeatures *
gst_caps_features_new_any(void)203 gst_caps_features_new_any (void)
204 {
205 GstCapsFeatures *features;
206
207 features = gst_caps_features_new_empty ();
208 features->is_any = TRUE;
209
210 return features;
211 }
212
213 /**
214 * gst_caps_features_new:
215 * @feature1: name of first feature to set
216 * @...: additional features
217 *
218 * Creates a new #GstCapsFeatures with the given features.
219 * The last argument must be %NULL.
220 *
221 * Free-function: gst_caps_features_free
222 *
223 * Returns: (transfer full): a new, empty #GstCapsFeatures
224 *
225 * Since: 1.2
226 */
227 GstCapsFeatures *
gst_caps_features_new(const gchar * feature1,...)228 gst_caps_features_new (const gchar * feature1, ...)
229 {
230 GstCapsFeatures *features;
231 va_list varargs;
232
233 g_return_val_if_fail (feature1 != NULL, NULL);
234
235 va_start (varargs, feature1);
236 features = gst_caps_features_new_valist (feature1, varargs);
237 va_end (varargs);
238
239 return features;
240 }
241
242 /**
243 * gst_caps_features_new_valist:
244 * @feature1: name of first feature to set
245 * @varargs: variable argument list
246 *
247 * Creates a new #GstCapsFeatures with the given features.
248 *
249 * Free-function: gst_caps_features_free
250 *
251 * Returns: (transfer full): a new, empty #GstCapsFeatures
252 *
253 * Since: 1.2
254 */
255 GstCapsFeatures *
gst_caps_features_new_valist(const gchar * feature1,va_list varargs)256 gst_caps_features_new_valist (const gchar * feature1, va_list varargs)
257 {
258 GstCapsFeatures *features;
259
260 g_return_val_if_fail (feature1 != NULL, NULL);
261
262 features = gst_caps_features_new_empty ();
263
264 while (feature1) {
265 gst_caps_features_add (features, feature1);
266 feature1 = va_arg (varargs, const gchar *);
267 }
268
269 return features;
270 }
271
272 /**
273 * gst_caps_features_new_id:
274 * @feature1: name of first feature to set
275 * @...: additional features
276 *
277 * Creates a new #GstCapsFeatures with the given features.
278 * The last argument must be 0.
279 *
280 * Free-function: gst_caps_features_free
281 *
282 * Returns: (transfer full): a new, empty #GstCapsFeatures
283 *
284 * Since: 1.2
285 */
286 GstCapsFeatures *
gst_caps_features_new_id(GQuark feature1,...)287 gst_caps_features_new_id (GQuark feature1, ...)
288 {
289 GstCapsFeatures *features;
290 va_list varargs;
291
292 g_return_val_if_fail (feature1 != 0, NULL);
293
294 va_start (varargs, feature1);
295 features = gst_caps_features_new_id_valist (feature1, varargs);
296 va_end (varargs);
297
298 return features;
299 }
300
301 /**
302 * gst_caps_features_new_id_valist:
303 * @feature1: name of first feature to set
304 * @varargs: variable argument list
305 *
306 * Creates a new #GstCapsFeatures with the given features.
307 *
308 * Free-function: gst_caps_features_free
309 *
310 * Returns: (transfer full): a new, empty #GstCapsFeatures
311 *
312 * Since: 1.2
313 */
314 GstCapsFeatures *
gst_caps_features_new_id_valist(GQuark feature1,va_list varargs)315 gst_caps_features_new_id_valist (GQuark feature1, va_list varargs)
316 {
317 GstCapsFeatures *features;
318
319 g_return_val_if_fail (feature1 != 0, NULL);
320
321 features = gst_caps_features_new_empty ();
322
323 while (feature1) {
324 gst_caps_features_add_id (features, feature1);
325 feature1 = va_arg (varargs, GQuark);
326 }
327
328 return features;
329 }
330
331 /**
332 * gst_caps_features_set_parent_refcount:
333 * @features: a #GstCapsFeatures
334 * @refcount: (in): a pointer to the parent's refcount
335 *
336 * Sets the parent_refcount field of #GstCapsFeatures. This field is used to
337 * determine whether a caps features is mutable or not. This function should only be
338 * called by code implementing parent objects of #GstCapsFeatures, as described in
339 * the MT Refcounting section of the design documents.
340 *
341 * Returns: %TRUE if the parent refcount could be set.
342 *
343 * Since: 1.2
344 */
345 gboolean
gst_caps_features_set_parent_refcount(GstCapsFeatures * features,gint * refcount)346 gst_caps_features_set_parent_refcount (GstCapsFeatures * features,
347 gint * refcount)
348 {
349 g_return_val_if_fail (features != NULL, FALSE);
350
351 /* if we have a parent_refcount already, we can only clear
352 * if with a NULL refcount */
353 if (features->parent_refcount) {
354 if (refcount != NULL) {
355 g_return_val_if_fail (refcount == NULL, FALSE);
356 return FALSE;
357 }
358 } else {
359 if (refcount == NULL) {
360 g_return_val_if_fail (refcount != NULL, FALSE);
361 return FALSE;
362 }
363 }
364
365 features->parent_refcount = refcount;
366
367 return TRUE;
368 }
369
370 /**
371 * gst_caps_features_copy:
372 * @features: a #GstCapsFeatures to duplicate
373 *
374 * Duplicates a #GstCapsFeatures and all its values.
375 *
376 * Free-function: gst_caps_features_free
377 *
378 * Returns: (transfer full): a new #GstCapsFeatures.
379 *
380 * Since: 1.2
381 */
382 GstCapsFeatures *
gst_caps_features_copy(const GstCapsFeatures * features)383 gst_caps_features_copy (const GstCapsFeatures * features)
384 {
385 GstCapsFeatures *copy;
386 guint i, n;
387
388 g_return_val_if_fail (features != NULL, NULL);
389
390 copy = gst_caps_features_new_empty ();
391 n = gst_caps_features_get_size (features);
392 for (i = 0; i < n; i++)
393 gst_caps_features_add_id (copy, gst_caps_features_get_nth_id (features, i));
394 copy->is_any = features->is_any;
395
396 return copy;
397 }
398
399 /**
400 * gst_caps_features_free:
401 * @features: (in) (transfer full): the #GstCapsFeatures to free
402 *
403 * Frees a #GstCapsFeatures and all its values. The caps features must not
404 * have a parent when this function is called.
405 *
406 * Since: 1.2
407 */
408 void
gst_caps_features_free(GstCapsFeatures * features)409 gst_caps_features_free (GstCapsFeatures * features)
410 {
411 g_return_if_fail (features != NULL);
412 g_return_if_fail (features->parent_refcount == NULL);
413
414 g_array_free (features->array, TRUE);
415 #ifdef USE_POISONING
416 memset (features, 0xff, sizeof (GstCapsFeatures));
417 #endif
418 GST_TRACE ("free caps features %p", features);
419
420 g_slice_free (GstCapsFeatures, features);
421 }
422
423 /**
424 * gst_caps_features_to_string:
425 * @features: a #GstCapsFeatures
426 *
427 * Converts @features to a human-readable string representation.
428 *
429 * For debugging purposes its easier to do something like this:
430 * |[<!-- language="C" -->
431 * GST_LOG ("features is %" GST_PTR_FORMAT, features);
432 * ]|
433 * This prints the features in human readable form.
434 *
435 * Free-function: g_free
436 *
437 * Returns: (transfer full): a pointer to string allocated by g_malloc().
438 * g_free() after usage.
439 *
440 * Since: 1.2
441 */
442 gchar *
gst_caps_features_to_string(const GstCapsFeatures * features)443 gst_caps_features_to_string (const GstCapsFeatures * features)
444 {
445 GString *s;
446
447 g_return_val_if_fail (features != NULL, NULL);
448
449 s = g_string_sized_new (FEATURES_ESTIMATED_STRING_LEN (features));
450
451 priv_gst_caps_features_append_to_gstring (features, s);
452
453 return g_string_free (s, FALSE);
454 }
455
456 void
priv_gst_caps_features_append_to_gstring(const GstCapsFeatures * features,GString * s)457 priv_gst_caps_features_append_to_gstring (const GstCapsFeatures * features,
458 GString * s)
459 {
460 guint i, n;
461
462 g_return_if_fail (features != NULL);
463
464 if (features->array->len == 0 && features->is_any) {
465 g_string_append (s, "ANY");
466 return;
467 }
468
469 n = features->array->len;
470 for (i = 0; i < n; i++) {
471 GQuark *quark = &g_array_index (features->array, GQuark, i);
472
473 g_string_append (s, g_quark_to_string (*quark));
474 if (i + 1 < n)
475 g_string_append (s, ", ");
476 }
477 }
478
479 /**
480 * gst_caps_features_from_string:
481 * @features: a string representation of a #GstCapsFeatures.
482 *
483 * Creates a #GstCapsFeatures from a string representation.
484 *
485 * Free-function: gst_caps_features_free
486 *
487 * Returns: (transfer full) (nullable): a new #GstCapsFeatures or
488 * %NULL when the string could not be parsed. Free with
489 * gst_caps_features_free() after use.
490 *
491 * Since: 1.2
492 */
493 GstCapsFeatures *
gst_caps_features_from_string(const gchar * features)494 gst_caps_features_from_string (const gchar * features)
495 {
496 GstCapsFeatures *ret;
497 gboolean escape = FALSE;
498 const gchar *features_orig = features;
499 const gchar *feature;
500
501 ret = gst_caps_features_new_empty ();
502
503 if (!features || *features == '\0')
504 return ret;
505
506 if (strcmp (features, "ANY") == 0) {
507 ret->is_any = TRUE;
508 return ret;
509 }
510
511 /* Skip trailing spaces */
512 while (*features == ' ')
513 features++;
514
515 feature = features;
516 while (TRUE) {
517 gchar c = *features;
518
519 if (c == '\\') {
520 escape = TRUE;
521 features++;
522 continue;
523 } else if ((!escape && c == ',') || c == '\0') {
524 guint len = features - feature + 1;
525 gchar *tmp;
526 gchar *p;
527
528 if (len == 1) {
529 g_warning ("Failed deserialize caps features '%s'", features_orig);
530 gst_caps_features_free (ret);
531 return NULL;
532 }
533
534 tmp = g_malloc (len);
535 memcpy (tmp, feature, len - 1);
536 tmp[len - 1] = '\0';
537
538 p = tmp + len - 1;
539 while (*p == ' ') {
540 *p = '\0';
541 p--;
542 }
543
544 if (strstr (tmp, " ") != NULL || *tmp == '\0') {
545 g_free (tmp);
546 g_warning ("Failed deserialize caps features '%s'", features_orig);
547 gst_caps_features_free (ret);
548 return NULL;
549 }
550
551 gst_caps_features_add (ret, tmp);
552 g_free (tmp);
553
554 if (c == '\0')
555 break;
556
557 /* Skip to the next value */
558 features++;
559 while (*features == ' ')
560 features++;
561 feature = features;
562 } else {
563 escape = FALSE;
564 features++;
565 }
566 }
567
568 return ret;
569 }
570
571 /**
572 * gst_caps_features_get_size:
573 * @features: a #GstCapsFeatures.
574 *
575 * Returns the number of features in @features.
576 *
577 * Returns: The number of features in @features.
578 *
579 * Since: 1.2
580 */
581 guint
gst_caps_features_get_size(const GstCapsFeatures * features)582 gst_caps_features_get_size (const GstCapsFeatures * features)
583 {
584 g_return_val_if_fail (features != NULL, 0);
585
586 return features->array->len;
587 }
588
589 /**
590 * gst_caps_features_get_nth:
591 * @features: a #GstCapsFeatures.
592 * @i: index of the feature
593 *
594 * Returns the @i-th feature of @features.
595 *
596 * Returns: (nullable): The @i-th feature of @features.
597 *
598 * Since: 1.2
599 */
600 const gchar *
gst_caps_features_get_nth(const GstCapsFeatures * features,guint i)601 gst_caps_features_get_nth (const GstCapsFeatures * features, guint i)
602 {
603 const gchar *feature;
604 GQuark quark;
605
606 g_return_val_if_fail (features != NULL, NULL);
607
608 quark = gst_caps_features_get_nth_id (features, i);
609 if (!quark)
610 return NULL;
611
612 feature = g_quark_to_string (quark);
613 return feature;
614 }
615
616 /**
617 * gst_caps_features_get_nth_id:
618 * @features: a #GstCapsFeatures.
619 * @i: index of the feature
620 *
621 * Returns the @i-th feature of @features.
622 *
623 * Returns: The @i-th feature of @features.
624 *
625 * Since: 1.2
626 */
627 GQuark
gst_caps_features_get_nth_id(const GstCapsFeatures * features,guint i)628 gst_caps_features_get_nth_id (const GstCapsFeatures * features, guint i)
629 {
630 GQuark *quark;
631
632 g_return_val_if_fail (features != NULL, 0);
633 g_return_val_if_fail (i < features->array->len, 0);
634
635 quark = &g_array_index (features->array, GQuark, i);
636
637 return *quark;
638 }
639
640 /**
641 * gst_caps_features_contains:
642 * @features: a #GstCapsFeatures.
643 * @feature: a feature
644 *
645 * Check if @features contains @feature.
646 *
647 * Returns: %TRUE if @features contains @feature.
648 *
649 * Since: 1.2
650 */
651 gboolean
gst_caps_features_contains(const GstCapsFeatures * features,const gchar * feature)652 gst_caps_features_contains (const GstCapsFeatures * features,
653 const gchar * feature)
654 {
655 g_return_val_if_fail (features != NULL, FALSE);
656 g_return_val_if_fail (feature != NULL, FALSE);
657
658 return gst_caps_features_contains_id (features,
659 g_quark_from_string (feature));
660 }
661
662 /**
663 * gst_caps_features_contains_id:
664 * @features: a #GstCapsFeatures.
665 * @feature: a feature
666 *
667 * Check if @features contains @feature.
668 *
669 * Returns: %TRUE if @features contains @feature.
670 *
671 * Since: 1.2
672 */
673 gboolean
gst_caps_features_contains_id(const GstCapsFeatures * features,GQuark feature)674 gst_caps_features_contains_id (const GstCapsFeatures * features, GQuark feature)
675 {
676 guint i, n;
677
678 g_return_val_if_fail (features != NULL, FALSE);
679 g_return_val_if_fail (feature != 0, FALSE);
680
681 if (features->is_any)
682 return TRUE;
683
684 n = features->array->len;
685 if (n == 0)
686 return feature == _gst_caps_feature_memory_system_memory;
687
688 for (i = 0; i < n; i++) {
689 if (gst_caps_features_get_nth_id (features, i) == feature)
690 return TRUE;
691 }
692
693 return FALSE;
694 }
695
696 /**
697 * gst_caps_features_is_equal:
698 * @features1: a #GstCapsFeatures.
699 * @features2: a #GstCapsFeatures.
700 *
701 * Check if @features1 and @features2 are equal.
702 *
703 * Returns: %TRUE if @features1 and @features2 are equal.
704 *
705 * Since: 1.2
706 */
707 gboolean
gst_caps_features_is_equal(const GstCapsFeatures * features1,const GstCapsFeatures * features2)708 gst_caps_features_is_equal (const GstCapsFeatures * features1,
709 const GstCapsFeatures * features2)
710 {
711 guint i, n;
712
713 g_return_val_if_fail (features1 != NULL, FALSE);
714 g_return_val_if_fail (features2 != NULL, FALSE);
715
716 if (features1->is_any || features2->is_any)
717 return TRUE;
718
719 /* Check for the sysmem==empty case */
720 if (features1->array->len == 0 && features2->array->len == 0)
721 return TRUE;
722 if (features1->array->len == 0 && features2->array->len == 1
723 && gst_caps_features_contains_id (features2,
724 _gst_caps_feature_memory_system_memory))
725 return TRUE;
726 if (features2->array->len == 0 && features1->array->len == 1
727 && gst_caps_features_contains_id (features1,
728 _gst_caps_feature_memory_system_memory))
729 return TRUE;
730
731 if (features1->array->len != features2->array->len)
732 return FALSE;
733
734 n = features1->array->len;
735 for (i = 0; i < n; i++)
736 if (!gst_caps_features_contains_id (features2,
737 gst_caps_features_get_nth_id (features1, i)))
738 return FALSE;
739
740 return TRUE;
741 }
742
743 /**
744 * gst_caps_features_is_any:
745 * @features: a #GstCapsFeatures.
746 *
747 * Check if @features is %GST_CAPS_FEATURES_ANY.
748 *
749 * Returns: %TRUE if @features is %GST_CAPS_FEATURES_ANY.
750 *
751 * Since: 1.2
752 */
753 gboolean
gst_caps_features_is_any(const GstCapsFeatures * features)754 gst_caps_features_is_any (const GstCapsFeatures * features)
755 {
756 g_return_val_if_fail (features != NULL, FALSE);
757
758 return features->is_any;
759 }
760
761 /**
762 * gst_caps_features_add:
763 * @features: a #GstCapsFeatures.
764 * @feature: a feature.
765 *
766 * Adds @feature to @features.
767 *
768 * Since: 1.2
769 */
770 void
gst_caps_features_add(GstCapsFeatures * features,const gchar * feature)771 gst_caps_features_add (GstCapsFeatures * features, const gchar * feature)
772 {
773 g_return_if_fail (features != NULL);
774 g_return_if_fail (IS_MUTABLE (features));
775 g_return_if_fail (feature != NULL);
776 g_return_if_fail (!features->is_any);
777
778 gst_caps_features_add_id (features, g_quark_from_string (feature));
779 }
780
781 /**
782 * gst_caps_features_add_id:
783 * @features: a #GstCapsFeatures.
784 * @feature: a feature.
785 *
786 * Adds @feature to @features.
787 *
788 * Since: 1.2
789 */
790 void
gst_caps_features_add_id(GstCapsFeatures * features,GQuark feature)791 gst_caps_features_add_id (GstCapsFeatures * features, GQuark feature)
792 {
793 g_return_if_fail (features != NULL);
794 g_return_if_fail (IS_MUTABLE (features));
795 g_return_if_fail (feature != 0);
796 g_return_if_fail (!features->is_any);
797
798 if (!gst_caps_feature_name_is_valid (g_quark_to_string (feature))) {
799 g_warning ("Invalid caps feature name: %s", g_quark_to_string (feature));
800 return;
801 }
802
803 /* If features is empty it will contain sysmem, however
804 * we want to add it explicitly if it is attempted to be
805 * added as first features
806 */
807 if (features->array->len > 0
808 && gst_caps_features_contains_id (features, feature))
809 return;
810
811 g_array_append_val (features->array, feature);
812 }
813
814 /**
815 * gst_caps_features_remove:
816 * @features: a #GstCapsFeatures.
817 * @feature: a feature.
818 *
819 * Removes @feature from @features.
820 *
821 * Since: 1.2
822 */
823 void
gst_caps_features_remove(GstCapsFeatures * features,const gchar * feature)824 gst_caps_features_remove (GstCapsFeatures * features, const gchar * feature)
825 {
826 g_return_if_fail (features != NULL);
827 g_return_if_fail (IS_MUTABLE (features));
828 g_return_if_fail (feature != NULL);
829
830 gst_caps_features_remove_id (features, g_quark_from_string (feature));
831 }
832
833 /**
834 * gst_caps_features_remove_id:
835 * @features: a #GstCapsFeatures.
836 * @feature: a feature.
837 *
838 * Removes @feature from @features.
839 *
840 * Since: 1.2
841 */
842 void
gst_caps_features_remove_id(GstCapsFeatures * features,GQuark feature)843 gst_caps_features_remove_id (GstCapsFeatures * features, GQuark feature)
844 {
845 guint i, n;
846
847 g_return_if_fail (features != NULL);
848 g_return_if_fail (IS_MUTABLE (features));
849 g_return_if_fail (feature != 0);
850
851 n = features->array->len;
852 for (i = 0; i < n; i++) {
853 GQuark quark = gst_caps_features_get_nth_id (features, i);
854
855 if (quark == feature) {
856 g_array_remove_index_fast (features->array, i);
857 return;
858 }
859 }
860 }
861
862 static void
gst_caps_features_transform_to_string(const GValue * src_value,GValue * dest_value)863 gst_caps_features_transform_to_string (const GValue * src_value,
864 GValue * dest_value)
865 {
866 g_return_if_fail (src_value != NULL);
867 g_return_if_fail (dest_value != NULL);
868
869 dest_value->data[0].v_pointer =
870 gst_caps_features_to_string (src_value->data[0].v_pointer);
871 }
872