2 * Copyright (C) 2010 Wim Taymans <wim.taymans@gmail.com>
4 * gstbufferpool.h: Header for GstBufferPool object
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 #ifndef __GST_BUFFER_POOL_H__
24 #define __GST_BUFFER_POOL_H__
26 #include <gst/gstminiobject.h>
27 #include <gst/gstatomicqueue.h>
28 #include <gst/gstpoll.h>
29 #include <gst/gstclock.h>
30 #include <gst/gstpad.h>
31 #include <gst/gstbuffer.h>
35 typedef struct _GstBufferPoolPrivate GstBufferPoolPrivate;
36 typedef struct _GstBufferPoolClass GstBufferPoolClass;
39 * GST_BUFFER_POOL_TRACE_NAME:
41 * The name used for tracing memory allocations.
43 #define GST_BUFFER_POOL_TRACE_NAME "GstBufferPool"
45 #define GST_TYPE_BUFFER_POOL (gst_buffer_pool_get_type())
46 #define GST_IS_BUFFER_POOL(obj) (G_TYPE_CHECK_INSTANCE_TYPE ((obj), GST_TYPE_BUFFER_POOL))
47 #define GST_IS_BUFFER_POOL_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass), GST_TYPE_BUFFER_POOL))
48 #define GST_BUFFER_POOL_GET_CLASS(obj) (G_TYPE_INSTANCE_GET_CLASS ((obj), GST_TYPE_BUFFER_POOL, GstBufferPoolClass))
49 #define GST_BUFFER_POOL(obj) (G_TYPE_CHECK_INSTANCE_CAST ((obj), GST_TYPE_BUFFER_POOL, GstBufferPool))
50 #define GST_BUFFER_POOL_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST ((klass), GST_TYPE_BUFFER_POOL, GstBufferPoolClass))
51 #define GST_BUFFER_POOL_CAST(obj) ((GstBufferPool *)(obj))
55 * @GST_BUFFER_POOL_FLAG_NONE: no flags
56 * @GST_BUFFER_POOL_FLAG_KEY_UNIT: buffer is keyframe
57 * @GST_BUFFER_POOL_FLAG_DONTWAIT: don't wait for buffer
58 * @GST_BUFFER_POOL_FLAG_DISCONT: buffer is discont
60 * Additional flags to control the allocation of a buffer
63 GST_BUFFER_POOL_FLAG_NONE = 0,
64 GST_BUFFER_POOL_FLAG_KEY_UNIT = (1 << 0),
65 GST_BUFFER_POOL_FLAG_DONTWAIT = (1 << 1),
66 GST_BUFFER_POOL_FLAG_DISCONT = (1 << 2),
67 GST_BUFFER_POOL_FLAG_LAST = (1 << 16),
71 * GstBufferPoolParams:
72 * @format: the format of @start and @stop
73 * @start: the start position
74 * @stop: the stop position
75 * @flags: additional flags
77 * Parameters passed to the gst_buffer_pool_acquire_buffer() function to control the
78 * allocation of the buffer.
80 typedef struct _GstBufferPoolParams {
84 GstBufferPoolFlags flags;
85 } GstBufferPoolParams;
88 * GST_BUFFER_POOL_IS_FLUSHING:
89 * @pool: a GstBufferPool
91 * Check if the bufferpool is flushing. Subclasses might want to check the
92 * state of the pool in the acquire function.
94 #define GST_BUFFER_POOL_IS_FLUSHING(pool) (g_atomic_int_get (&pool->flushing))
98 * @object: the parent structure
100 * The structure of a #GstBufferPool. Use the associated macros to access the public
103 struct _GstBufferPool {
111 GstAtomicQueue *queue;
115 GstStructure *config;
117 GstBufferPoolPrivate *priv;
119 gpointer _gst_reserved[GST_PADDING];
122 struct _GstBufferPoolClass {
123 GstObjectClass object_class;
126 const gchar ** (*get_metas) (GstBufferPool *pool);
127 gboolean (*set_config) (GstBufferPool *pool, GstStructure *config);
129 gboolean (*start) (GstBufferPool *pool);
130 gboolean (*stop) (GstBufferPool *pool);
132 GstFlowReturn (*acquire_buffer) (GstBufferPool *pool, GstBuffer **buffer,
133 GstBufferPoolParams *params);
134 GstFlowReturn (*alloc_buffer) (GstBufferPool *pool, GstBuffer **buffer,
135 GstBufferPoolParams *params);
136 void (*release_buffer) (GstBufferPool *pool, GstBuffer *buffer);
137 void (*free_buffer) (GstBufferPool *pool, GstBuffer *buffer);
139 gpointer _gst_reserved[GST_PADDING];
142 GType gst_buffer_pool_get_type (void);
145 GstBufferPool * gst_buffer_pool_new (void);
147 /* state management */
148 gboolean gst_buffer_pool_set_active (GstBufferPool *pool, gboolean active);
150 gboolean gst_buffer_pool_set_config (GstBufferPool *pool, GstStructure *config);
151 GstStructure * gst_buffer_pool_get_config (GstBufferPool *pool);
153 const gchar ** gst_buffer_pool_get_metas (GstBufferPool *pool);
155 /* helpers for configuring the config structure */
156 void gst_buffer_pool_config_set (GstStructure *config, const GstCaps *caps,
157 guint size, guint min_buffers, guint max_buffers,
158 guint prefix, guint align);
159 gboolean gst_buffer_pool_config_get (GstStructure *config, const GstCaps **caps,
160 guint *size, guint *min_buffers, guint *max_buffers,
161 guint *prefix, guint *align);
163 guint gst_buffer_pool_config_n_metas (GstStructure *config);
164 void gst_buffer_pool_config_add_meta (GstStructure *config, const gchar *api);
165 const gchar * gst_buffer_pool_config_get_meta (GstStructure *config, guint index);
166 gboolean gst_buffer_pool_config_has_meta (GstStructure *config, const gchar *api);
168 /* buffer management */
169 GstFlowReturn gst_buffer_pool_acquire_buffer (GstBufferPool *pool, GstBuffer **buffer,
170 GstBufferPoolParams *params);
171 void gst_buffer_pool_release_buffer (GstBufferPool *pool, GstBuffer *buffer);
175 #endif /* __GST_BUFFER_POOL_H__ */