2 * Copyright (C) 2010 Wim Taymans <wim.taymans@gmail.com>
4 * gstbufferpool.c: GstBufferPool baseclass
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.
23 * SECTION:gstbufferpool
24 * @short_description: Pool for buffers
25 * @see_also: #GstBuffer
29 #include "gst_private.h"
35 #include <sys/types.h>
40 #include "gstbufferpool.h"
42 GST_DEBUG_CATEGORY_STATIC (gst_buffer_pool_debug);
43 #define GST_CAT_DEFAULT gst_buffer_pool_debug
45 #define GST_BUFFER_POOL_GET_PRIVATE(obj) \
46 (G_TYPE_INSTANCE_GET_PRIVATE ((obj), GST_TYPE_BUFFER_POOL, GstBufferPoolPrivate))
48 #define GST_BUFFER_POOL_LOCK(pool) (g_static_rec_mutex_lock(&pool->priv->rec_lock))
49 #define GST_BUFFER_POOL_UNLOCK(pool) (g_static_rec_mutex_unlock(&pool->priv->rec_lock))
51 struct _GstBufferPoolPrivate
53 GStaticRecMutex rec_lock;
67 static void gst_buffer_pool_finalize (GObject * object);
69 G_DEFINE_TYPE (GstBufferPool, gst_buffer_pool, GST_TYPE_OBJECT);
71 static gboolean default_start (GstBufferPool * pool);
72 static gboolean default_stop (GstBufferPool * pool);
73 static gboolean default_set_config (GstBufferPool * pool,
74 GstStructure * config);
75 static GstFlowReturn default_alloc_buffer (GstBufferPool * pool,
76 GstBuffer ** buffer, GstBufferPoolParams * params);
77 static GstFlowReturn default_acquire_buffer (GstBufferPool * pool,
78 GstBuffer ** buffer, GstBufferPoolParams * params);
79 static void default_reset_buffer (GstBufferPool * pool, GstBuffer * buffer,
80 GstBufferPoolParams * params);
81 static void default_free_buffer (GstBufferPool * pool, GstBuffer * buffer);
82 static void default_release_buffer (GstBufferPool * pool, GstBuffer * buffer);
85 gst_buffer_pool_class_init (GstBufferPoolClass * klass)
87 GObjectClass *gobject_class = (GObjectClass *) klass;
89 g_type_class_add_private (klass, sizeof (GstBufferPoolPrivate));
91 gobject_class->finalize = gst_buffer_pool_finalize;
93 klass->start = default_start;
94 klass->stop = default_stop;
95 klass->set_config = default_set_config;
96 klass->acquire_buffer = default_acquire_buffer;
97 klass->reset_buffer = default_reset_buffer;
98 klass->alloc_buffer = default_alloc_buffer;
99 klass->release_buffer = default_release_buffer;
100 klass->free_buffer = default_free_buffer;
102 GST_DEBUG_CATEGORY_INIT (gst_buffer_pool_debug, "bufferpool", 0,
107 gst_buffer_pool_init (GstBufferPool * pool)
109 pool->priv = GST_BUFFER_POOL_GET_PRIVATE (pool);
111 g_static_rec_mutex_init (&pool->priv->rec_lock);
113 pool->poll = gst_poll_new_timer ();
114 pool->queue = gst_atomic_queue_new (10);
115 pool->flushing = TRUE;
116 pool->active = FALSE;
117 pool->configured = FALSE;
118 pool->started = FALSE;
119 pool->config = gst_structure_id_empty_new (GST_QUARK (BUFFER_POOL_CONFIG));
120 gst_buffer_pool_config_set (pool->config, NULL, 0, 0, 0, 0, 0);
121 gst_poll_write_control (pool->poll);
123 GST_DEBUG_OBJECT (pool, "created");
127 gst_buffer_pool_finalize (GObject * object)
131 pool = GST_BUFFER_POOL_CAST (object);
133 GST_DEBUG_OBJECT (pool, "finalize");
135 gst_buffer_pool_set_active (pool, FALSE);
136 gst_atomic_queue_unref (pool->queue);
137 gst_poll_free (pool->poll);
138 gst_structure_free (pool->config);
139 g_static_rec_mutex_free (&pool->priv->rec_lock);
141 G_OBJECT_CLASS (gst_buffer_pool_parent_class)->finalize (object);
145 * gst_buffer_pool_new:
147 * Creates a new #GstBufferPool instance.
149 * Returns: a new #GstBufferPool instance
152 gst_buffer_pool_new (void)
154 GstBufferPool *result;
156 result = g_object_newv (GST_TYPE_BUFFER_POOL, 0, NULL);
157 GST_DEBUG_OBJECT (result, "created new buffer pool");
163 default_alloc_buffer (GstBufferPool * pool, GstBuffer ** buffer,
164 GstBufferPoolParams * params)
166 GstBufferPoolPrivate *priv = pool->priv;
169 *buffer = gst_buffer_new ();
171 mem = gst_allocator_alloc (NULL, priv->size + priv->prefix, priv->align);
172 gst_memory_resize (mem, priv->prefix, priv->size);
173 gst_buffer_take_memory (*buffer, -1, mem);
178 /* the default implementation for preallocating the buffers
181 default_start (GstBufferPool * pool)
184 GstBufferPoolPrivate *priv = pool->priv;
185 GstBufferPoolClass *pclass;
187 pclass = GST_BUFFER_POOL_GET_CLASS (pool);
189 /* no alloc function, error */
190 if (G_UNLIKELY (pclass->alloc_buffer == NULL))
193 /* we need to prealloc buffers */
194 for (i = 0; i < priv->min_buffers; i++) {
197 if (pclass->alloc_buffer (pool, &buffer, NULL) != GST_FLOW_OK)
200 GST_LOG_OBJECT (pool, "prealloced buffer %d: %p", i, buffer);
201 /* release to the queue, we call the vmethod directly, we don't need to do
202 * the other refcount handling right now. */
203 if (G_LIKELY (pclass->release_buffer))
204 pclass->release_buffer (pool, buffer);
211 GST_WARNING_OBJECT (pool, "no alloc function");
216 GST_WARNING_OBJECT (pool, "alloc function failed");
221 /* must be called with the lock */
223 do_start (GstBufferPool * pool)
225 if (!pool->started) {
226 GstBufferPoolClass *pclass;
228 pclass = GST_BUFFER_POOL_GET_CLASS (pool);
230 GST_LOG_OBJECT (pool, "starting");
231 /* start the pool, subclasses should allocate buffers and put them
233 if (G_LIKELY (pclass->start)) {
234 if (!pclass->start (pool))
237 pool->started = TRUE;
244 default_free_buffer (GstBufferPool * pool, GstBuffer * buffer)
246 gst_buffer_unref (buffer);
249 /* must be called with the lock */
251 default_stop (GstBufferPool * pool)
254 GstBufferPoolClass *pclass;
256 pclass = GST_BUFFER_POOL_GET_CLASS (pool);
259 while ((buffer = gst_atomic_queue_pop (pool->queue))) {
260 GST_LOG_OBJECT (pool, "freeing %p", buffer);
261 gst_poll_read_control (pool->poll);
263 if (G_LIKELY (pclass->free_buffer))
264 pclass->free_buffer (pool, buffer);
269 /* must be called with the lock */
271 do_stop (GstBufferPool * pool)
274 GstBufferPoolClass *pclass;
276 pclass = GST_BUFFER_POOL_GET_CLASS (pool);
278 GST_LOG_OBJECT (pool, "stopping");
279 if (G_LIKELY (pclass->stop)) {
280 if (!pclass->stop (pool))
283 pool->started = FALSE;
289 * gst_buffer_pool_set_active:
290 * @pool: a #GstBufferPool
291 * @active: the new active state
293 * Control the active state of @pool. When the pool is active, new calls to
294 * gst_buffer_pool_acquire_buffer() will return with GST_FLOW_WRONG_STATE.
296 * Activating the bufferpool will preallocate all resources in the pool based on
297 * the configuration of the pool.
299 * Deactivating will free the resources again when there are no outstanding
300 * buffers. When there are outstanding buffers, they will be freed as soon as
301 * they are all returned to the pool.
303 * Returns: %FALSE when the pool was not configured or when preallocation of the
307 gst_buffer_pool_set_active (GstBufferPool * pool, gboolean active)
311 g_return_val_if_fail (GST_IS_BUFFER_POOL (pool), FALSE);
313 GST_LOG_OBJECT (pool, "active %d", active);
315 GST_BUFFER_POOL_LOCK (pool);
316 /* just return if we are already in the right state */
317 if (pool->active == active)
320 /* we need to be configured */
321 if (!pool->configured)
325 if (!do_start (pool))
328 /* unset the flushing state now */
329 gst_poll_read_control (pool->poll);
330 g_atomic_int_set (&pool->flushing, FALSE);
334 /* set to flushing first */
335 g_atomic_int_set (&pool->flushing, TRUE);
336 gst_poll_write_control (pool->poll);
338 /* when all buffers are in the pool, free them. Else they will be
339 * freed when they are released */
340 outstanding = g_atomic_int_get (&pool->outstanding);
341 GST_LOG_OBJECT (pool, "outstanding buffers %d", outstanding);
342 if (outstanding == 0) {
347 pool->active = active;
348 GST_BUFFER_POOL_UNLOCK (pool);
354 GST_DEBUG_OBJECT (pool, "pool was in the right state");
355 GST_BUFFER_POOL_UNLOCK (pool);
360 GST_ERROR_OBJECT (pool, "pool was not configured");
361 GST_BUFFER_POOL_UNLOCK (pool);
366 GST_ERROR_OBJECT (pool, "start failed");
367 GST_BUFFER_POOL_UNLOCK (pool);
372 GST_WARNING_OBJECT (pool, "stop failed");
373 GST_BUFFER_POOL_UNLOCK (pool);
379 * gst_buffer_pool_is_active:
380 * @pool: a #GstBufferPool
382 * Check if @pool is active. A pool can be activated with the
383 * gst_buffer_pool_set_active() call.
385 * Returns: %TRUE when the pool is active.
388 gst_buffer_pool_is_active (GstBufferPool * pool)
392 GST_BUFFER_POOL_LOCK (pool);
394 GST_BUFFER_POOL_UNLOCK (pool);
400 default_set_config (GstBufferPool * pool, GstStructure * config)
402 GstBufferPoolPrivate *priv = pool->priv;
404 guint size, min_buffers, max_buffers;
407 /* parse the config and keep around */
408 if (!gst_buffer_pool_config_get (config, &caps, &size, &min_buffers,
409 &max_buffers, &prefix, &align))
412 GST_DEBUG_OBJECT (pool, "config %" GST_PTR_FORMAT, config);
415 priv->min_buffers = min_buffers;
416 priv->max_buffers = max_buffers;
417 priv->prefix = prefix;
424 GST_WARNING_OBJECT (pool, "invalid config %" GST_PTR_FORMAT, config);
430 * gst_buffer_pool_set_config:
431 * @pool: a #GstBufferPool
432 * @config: a #GstStructure
434 * Set the configuration of the pool. The pool must be inactive and all buffers
435 * allocated form this pool must be returned or else this function will do
436 * nothing and return FALSE.
438 * @config is a #GstStructure that contains the configuration parameters for
439 * the pool. A default and mandatory set of parameters can be configured with
440 * gst_buffer_pool_config_set(). This function takes ownership of @config.
442 * Returns: TRUE when the configuration could be set.
445 gst_buffer_pool_set_config (GstBufferPool * pool, GstStructure * config)
448 GstBufferPoolClass *pclass;
450 g_return_val_if_fail (GST_IS_BUFFER_POOL (pool), FALSE);
451 g_return_val_if_fail (config != NULL, FALSE);
453 GST_BUFFER_POOL_LOCK (pool);
454 /* can't change the settings when active */
458 /* we can't change when outstanding buffers */
459 if (g_atomic_int_get (&pool->outstanding) != 0)
460 goto have_outstanding;
462 pclass = GST_BUFFER_POOL_GET_CLASS (pool);
464 /* set the new config */
465 if (G_LIKELY (pclass->set_config))
466 result = pclass->set_config (pool, config);
472 gst_structure_free (pool->config);
473 pool->config = config;
475 /* now we are configured */
476 pool->configured = TRUE;
478 GST_BUFFER_POOL_UNLOCK (pool);
485 GST_WARNING_OBJECT (pool, "can't change config, we are active");
486 GST_BUFFER_POOL_UNLOCK (pool);
491 GST_WARNING_OBJECT (pool, "can't change config, have outstanding buffers");
492 GST_BUFFER_POOL_UNLOCK (pool);
498 * gst_buffer_pool_get_config:
499 * @pool: a #GstBufferPool
501 * Get a copy of the current configuration of the pool. This configuration
502 * can either be modified and used for the gst_buffer_pool_set_config() call
503 * or it must be freed after usage.
505 * Returns: a copy of the current configuration of @pool. use
506 * gst_structure_free() after usage or gst_buffer_pool_set_config().
509 gst_buffer_pool_get_config (GstBufferPool * pool)
511 GstStructure *result;
513 g_return_val_if_fail (GST_IS_BUFFER_POOL (pool), NULL);
515 GST_BUFFER_POOL_UNLOCK (pool);
516 result = gst_structure_copy (pool->config);
517 GST_BUFFER_POOL_UNLOCK (pool);
522 static const gchar *empty_option[] = { NULL };
525 * gst_buffer_pool_get_options:
526 * @pool: a #GstBufferPool
528 * Get a NULL terminated array of string with supported bufferpool options for
529 * @pool. An option would typically be enabled with
530 * gst_buffer_pool_config_add_option().
532 * Returns: a NULL terminated array of strings.
535 gst_buffer_pool_get_options (GstBufferPool * pool)
537 GstBufferPoolClass *pclass;
538 const gchar **result;
540 g_return_val_if_fail (GST_IS_BUFFER_POOL (pool), NULL);
542 pclass = GST_BUFFER_POOL_GET_CLASS (pool);
544 if (G_LIKELY (pclass->get_options)) {
545 if ((result = pclass->get_options (pool)) == NULL)
548 result = empty_option;
555 g_warning ("bufferpool subclass returned NULL options");
561 * gst_buffer_pool_has_option:
562 * @pool: a #GstBufferPool
565 * Check if the bufferpool supports @option.
567 * Returns: a NULL terminated array of strings.
570 gst_buffer_pool_has_option (GstBufferPool * pool, const gchar * option)
573 const gchar **options;
575 g_return_val_if_fail (GST_IS_BUFFER_POOL (pool), FALSE);
576 g_return_val_if_fail (option != NULL, FALSE);
578 options = gst_buffer_pool_get_options (pool);
580 for (i = 0; options[i]; i++) {
581 if (g_str_equal (options[i], option))
588 * gst_buffer_pool_config_set:
589 * @config: a #GstBufferPool configuration
590 * @caps: caps for the buffers
591 * @size: the size of each buffer, not including prefix
592 * @min_buffers: the minimum amount of buffers to allocate.
593 * @max_buffers: the maximum amount of buffers to allocate or 0 for unlimited.
594 * @prefix: prefix each buffer with this many bytes
595 * @align: alignment of the buffer data.
597 * Configure @config with the given parameters.
600 gst_buffer_pool_config_set (GstStructure * config, const GstCaps * caps,
601 guint size, guint min_buffers, guint max_buffers, guint prefix, guint align)
603 g_return_if_fail (config != NULL);
605 gst_structure_id_set (config,
606 GST_QUARK (CAPS), GST_TYPE_CAPS, caps,
607 GST_QUARK (SIZE), G_TYPE_UINT, size,
608 GST_QUARK (MIN_BUFFERS), G_TYPE_UINT, min_buffers,
609 GST_QUARK (MAX_BUFFERS), G_TYPE_UINT, max_buffers,
610 GST_QUARK (PREFIX), G_TYPE_UINT, prefix,
611 GST_QUARK (ALIGN), G_TYPE_UINT, align, NULL);
615 * gst_buffer_pool_config_add_option:
616 * @config: a #GstBufferPool configuration
617 * @option: an option to add
619 * Enabled the option in @config. This will instruct the @bufferpool to enable
620 * the specified option on the buffers that it allocates.
622 * The supported options by @pool can be retrieved with gst_buffer_pool_get_options().
625 gst_buffer_pool_config_add_option (GstStructure * config, const gchar * option)
629 GValue option_value = { 0 };
632 g_return_if_fail (config != NULL);
634 value = gst_structure_id_get_value (config, GST_QUARK (OPTIONS));
636 array = (GValueArray *) g_value_get_boxed (value);
638 GValue new_array_val = { 0, };
640 array = g_value_array_new (0);
642 g_value_init (&new_array_val, G_TYPE_VALUE_ARRAY);
643 g_value_take_boxed (&new_array_val, array);
645 gst_structure_id_take_value (config, GST_QUARK (OPTIONS), &new_array_val);
647 for (i = 0; i < array->n_values; i++) {
648 value = g_value_array_get_nth (array, i);
649 if (g_str_equal (option, g_value_get_string (value)))
652 g_value_init (&option_value, G_TYPE_STRING);
653 g_value_set_string (&option_value, option);
654 g_value_array_append (array, &option_value);
655 g_value_unset (&option_value);
659 * gst_buffer_pool_config_n_options:
660 * @config: a #GstBufferPool configuration
662 * Retrieve the number of values currently stored in the
663 * options array of the @config structure.
665 * Returns: the options array size as a #guint.
668 gst_buffer_pool_config_n_options (GstStructure * config)
674 g_return_val_if_fail (config != NULL, 0);
676 value = gst_structure_id_get_value (config, GST_QUARK (OPTIONS));
678 array = (GValueArray *) g_value_get_boxed (value);
679 size = array->n_values;
685 * gst_buffer_pool_config_get_option:
686 * @config: a #GstBufferPool configuration
687 * @index: position in the option array to read
689 * Parse an available @config and get the option
690 * at @index of the options API array.
692 * Returns: a #gchar of the option at @index.
695 gst_buffer_pool_config_get_option (GstStructure * config, guint index)
698 const gchar *ret = NULL;
700 g_return_val_if_fail (config != NULL, 0);
702 value = gst_structure_id_get_value (config, GST_QUARK (OPTIONS));
705 GValue *option_value;
707 array = (GValueArray *) g_value_get_boxed (value);
708 option_value = g_value_array_get_nth (array, index);
711 ret = g_value_get_string (option_value);
717 * gst_buffer_pool_config_has_option:
718 * @config: a #GstBufferPool configuration
721 * Check if @config contains @option
723 * Returns: TRUE if the options array contains @option.
726 gst_buffer_pool_config_has_option (GstStructure * config, const gchar * option)
730 g_return_val_if_fail (config != NULL, 0);
732 value = gst_structure_id_get_value (config, GST_QUARK (OPTIONS));
735 GValue *option_value;
738 array = (GValueArray *) g_value_get_boxed (value);
739 for (i = 0; i < array->n_values; i++) {
740 option_value = g_value_array_get_nth (array, i);
741 if (g_str_equal (option, g_value_get_string (option_value)))
749 * gst_buffer_pool_config_get:
750 * @config: a #GstBufferPool configuration
751 * @caps: the caps of buffers
752 * @size: the size of each buffer, not including prefix
753 * @min_buffers: the minimum amount of buffers to allocate.
754 * @max_buffers: the maximum amount of buffers to allocate or 0 for unlimited.
755 * @prefix: prefix each buffer with this many bytes
756 * @align: alignment of the buffer data.
758 * Get the configuration values from @config.
761 gst_buffer_pool_config_get (GstStructure * config, const GstCaps ** caps,
762 guint * size, guint * min_buffers, guint * max_buffers, guint * prefix,
765 g_return_val_if_fail (config != NULL, FALSE);
767 return gst_structure_id_get (config,
768 GST_QUARK (CAPS), GST_TYPE_CAPS, caps,
769 GST_QUARK (SIZE), G_TYPE_UINT, size,
770 GST_QUARK (MIN_BUFFERS), G_TYPE_UINT, min_buffers,
771 GST_QUARK (MAX_BUFFERS), G_TYPE_UINT, max_buffers,
772 GST_QUARK (PREFIX), G_TYPE_UINT, prefix,
773 GST_QUARK (ALIGN), G_TYPE_UINT, align, NULL);
777 default_acquire_buffer (GstBufferPool * pool, GstBuffer ** buffer,
778 GstBufferPoolParams * params)
780 GstFlowReturn result;
781 GstBufferPoolClass *pclass;
782 GstBufferPoolPrivate *priv = pool->priv;
784 pclass = GST_BUFFER_POOL_GET_CLASS (pool);
787 if (G_UNLIKELY (g_atomic_int_get (&pool->flushing)))
790 /* try to get a buffer from the queue */
791 *buffer = gst_atomic_queue_pop (pool->queue);
792 if (G_LIKELY (*buffer)) {
793 gst_poll_read_control (pool->poll);
794 result = GST_FLOW_OK;
795 GST_LOG_OBJECT (pool, "acquired buffer %p", *buffer);
800 if (priv->max_buffers == 0) {
801 /* no max_buffers, we allocate some more */
802 if (G_LIKELY (pclass->alloc_buffer)) {
803 result = pclass->alloc_buffer (pool, buffer, params);
805 result = GST_FLOW_NOT_SUPPORTED;
806 GST_LOG_OBJECT (pool, "alloc buffer %p", *buffer);
810 /* check if we need to wait */
811 if (params && (params->flags & GST_BUFFER_POOL_FLAG_DONTWAIT)) {
812 GST_LOG_OBJECT (pool, "no more buffers");
813 result = GST_FLOW_UNEXPECTED;
818 GST_LOG_OBJECT (pool, "waiting for free buffers");
819 gst_poll_wait (pool->poll, GST_CLOCK_TIME_NONE);
827 GST_DEBUG_OBJECT (pool, "we are flushing");
828 return GST_FLOW_WRONG_STATE;
833 dec_outstanding (GstBufferPool * pool)
835 if (g_atomic_int_dec_and_test (&pool->outstanding)) {
836 /* all buffers are returned to the pool, see if we need to free them */
837 if (g_atomic_int_get (&pool->flushing)) {
838 /* take the lock so that set_active is not run concurrently */
839 GST_BUFFER_POOL_LOCK (pool);
840 /* recheck the flushing state in the lock, the pool could have been
841 * set to active again */
842 if (g_atomic_int_get (&pool->flushing))
845 GST_BUFFER_POOL_UNLOCK (pool);
851 default_reset_buffer (GstBufferPool * pool, GstBuffer * buffer,
852 GstBufferPoolParams * params)
854 GST_BUFFER_FLAGS (buffer) = 0;
856 GST_BUFFER_TIMESTAMP (buffer) = GST_CLOCK_TIME_NONE;
857 GST_BUFFER_DURATION (buffer) = GST_CLOCK_TIME_NONE;
858 GST_BUFFER_OFFSET (buffer) = GST_BUFFER_OFFSET_NONE;
859 GST_BUFFER_OFFSET_END (buffer) = GST_BUFFER_OFFSET_NONE;
863 * gst_buffer_pool_acquire_buffer:
864 * @pool: a #GstBufferPool
865 * @buffer: a location for a #GstBuffer
866 * @params: parameters.
868 * Acquire a buffer from @pool. @buffer should point to a memory location that
869 * can hold a pointer to the new buffer.
871 * @params can be NULL or contain optional parameters to influence the allocation.
873 * Returns: a #GstFlowReturn such as GST_FLOW_WRONG_STATE when the pool is
877 gst_buffer_pool_acquire_buffer (GstBufferPool * pool, GstBuffer ** buffer,
878 GstBufferPoolParams * params)
880 GstBufferPoolClass *pclass;
881 GstFlowReturn result;
883 g_return_val_if_fail (GST_IS_BUFFER_POOL (pool), GST_FLOW_ERROR);
884 g_return_val_if_fail (buffer != NULL, GST_FLOW_ERROR);
886 pclass = GST_BUFFER_POOL_GET_CLASS (pool);
888 /* assume we'll have one more outstanding buffer we need to do that so
889 * that concurrent set_active doesn't clear the buffers */
890 g_atomic_int_inc (&pool->outstanding);
892 if (G_LIKELY (pclass->acquire_buffer))
893 result = pclass->acquire_buffer (pool, buffer, params);
895 result = GST_FLOW_NOT_SUPPORTED;
897 if (G_LIKELY (result == GST_FLOW_OK)) {
898 /* all buffers from the pool point to the pool and have the refcount of the
899 * pool incremented */
900 (*buffer)->pool = gst_object_ref (pool);
901 /* now reset the buffer when needed */
902 if (G_LIKELY (pclass->reset_buffer))
903 pclass->reset_buffer (pool, *buffer, params);
905 dec_outstanding (pool);
912 default_release_buffer (GstBufferPool * pool, GstBuffer * buffer)
914 /* keep it around in our queue */
915 GST_LOG_OBJECT (pool, "released buffer %p", buffer);
916 gst_atomic_queue_push (pool->queue, buffer);
917 gst_poll_write_control (pool->poll);
921 * gst_buffer_pool_release_buffer:
922 * @pool: a #GstBufferPool
923 * @buffer: a #GstBuffer
925 * Release @buffer to @pool. @buffer should have previously been allocated from
926 * @pool with gst_buffer_pool_acquire_buffer().
928 * This function is usually called automatically when the last ref on @buffer
932 gst_buffer_pool_release_buffer (GstBufferPool * pool, GstBuffer * buffer)
934 GstBufferPoolClass *pclass;
936 g_return_if_fail (GST_IS_BUFFER_POOL (pool));
937 g_return_if_fail (buffer != NULL);
939 /* check that the buffer is ours, all buffers returned to the pool have the
940 * pool member set to NULL and the pool refcount decreased */
941 if (!g_atomic_pointer_compare_and_exchange ((gpointer *) & buffer->pool,
945 pclass = GST_BUFFER_POOL_GET_CLASS (pool);
947 if (G_LIKELY (pclass->release_buffer))
948 pclass->release_buffer (pool, buffer);
950 dec_outstanding (pool);
952 /* decrease the refcount that the buffer had to us */
953 gst_object_unref (pool);