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256 lines
9.9 KiB
C
256 lines
9.9 KiB
C
/* GStreamer
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* Copyright (C) 2010 Wim Taymans <wim.taymans@gmail.com>
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*
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* gstbufferpool.h: Header for GstBufferPool object
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
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* Boston, MA 02110-1301, USA.
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*/
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#ifndef __GST_BUFFER_POOL_H__
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#define __GST_BUFFER_POOL_H__
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#include <gst/gstminiobject.h>
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#include <gst/gstpad.h>
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#include <gst/gstbuffer.h>
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G_BEGIN_DECLS
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typedef struct _GstBufferPoolPrivate GstBufferPoolPrivate;
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typedef struct _GstBufferPoolClass GstBufferPoolClass;
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#define GST_TYPE_BUFFER_POOL (gst_buffer_pool_get_type())
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#define GST_IS_BUFFER_POOL(obj) (G_TYPE_CHECK_INSTANCE_TYPE ((obj), GST_TYPE_BUFFER_POOL))
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#define GST_IS_BUFFER_POOL_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass), GST_TYPE_BUFFER_POOL))
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#define GST_BUFFER_POOL_GET_CLASS(obj) (G_TYPE_INSTANCE_GET_CLASS ((obj), GST_TYPE_BUFFER_POOL, GstBufferPoolClass))
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#define GST_BUFFER_POOL(obj) (G_TYPE_CHECK_INSTANCE_CAST ((obj), GST_TYPE_BUFFER_POOL, GstBufferPool))
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#define GST_BUFFER_POOL_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST ((klass), GST_TYPE_BUFFER_POOL, GstBufferPoolClass))
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#define GST_BUFFER_POOL_CAST(obj) ((GstBufferPool *)(obj))
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/**
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* GstBufferPoolAcquireFlags:
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* @GST_BUFFER_POOL_ACQUIRE_FLAG_NONE: no flags
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* @GST_BUFFER_POOL_ACQUIRE_FLAG_KEY_UNIT: buffer is keyframe
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* @GST_BUFFER_POOL_ACQUIRE_FLAG_DONTWAIT: when the bufferpool is empty, acquire_buffer
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* will by default block until a buffer is released into the pool again. Setting
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* this flag makes acquire_buffer return #GST_FLOW_EOS instead of blocking.
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* @GST_BUFFER_POOL_ACQUIRE_FLAG_DISCONT: buffer is discont
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* @GST_BUFFER_POOL_ACQUIRE_FLAG_LAST: last flag, subclasses can use private flags
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* starting from this value.
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*
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* Additional flags to control the allocation of a buffer
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*/
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typedef enum {
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GST_BUFFER_POOL_ACQUIRE_FLAG_NONE = 0,
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GST_BUFFER_POOL_ACQUIRE_FLAG_KEY_UNIT = (1 << 0),
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GST_BUFFER_POOL_ACQUIRE_FLAG_DONTWAIT = (1 << 1),
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GST_BUFFER_POOL_ACQUIRE_FLAG_DISCONT = (1 << 2),
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GST_BUFFER_POOL_ACQUIRE_FLAG_LAST = (1 << 16),
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} GstBufferPoolAcquireFlags;
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typedef struct _GstBufferPoolAcquireParams GstBufferPoolAcquireParams;
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/**
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* GstBufferPoolAcquireParams:
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* @format: the format of @start and @stop
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* @start: the start position
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* @stop: the stop position
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* @flags: additional flags
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*
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* Parameters passed to the gst_buffer_pool_acquire_buffer() function to control the
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* allocation of the buffer.
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*
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* The default implementation ignores the @start and @stop members but other
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* implementations can use this extra information to decide what buffer to
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* return.
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*/
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struct _GstBufferPoolAcquireParams {
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GstFormat format;
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gint64 start;
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gint64 stop;
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GstBufferPoolAcquireFlags flags;
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/*< private >*/
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gpointer _gst_reserved[GST_PADDING];
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};
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/**
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* GST_BUFFER_POOL_IS_FLUSHING:
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* @pool: a GstBufferPool
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*
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* Check if the bufferpool is flushing. Subclasses might want to check the
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* state of the pool in the acquire function.
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*/
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#define GST_BUFFER_POOL_IS_FLUSHING(pool) (g_atomic_int_get (&pool->flushing))
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/**
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* GstBufferPool:
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*
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* The structure of a #GstBufferPool. Use the associated macros to access the public
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* variables.
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*/
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struct _GstBufferPool {
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GstObject object;
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/*< protected >*/
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gint flushing;
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/*< private >*/
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GstBufferPoolPrivate *priv;
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gpointer _gst_reserved[GST_PADDING];
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};
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/**
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* GstBufferPoolClass:
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* @object_class: Object parent class
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* @get_options: get a list of options supported by this pool
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* @set_config: apply the bufferpool configuration. The default configuration
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* will parse the default config parameters
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* @start: start the bufferpool. The default implementation will preallocate
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* min-buffers buffers and put them in the queue
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* @stop: stop the bufferpool. the default implementation will free the
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* preallocated buffers. This function is called when all the buffers are
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* returned to the pool.
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* @acquire_buffer: get a new buffer from the pool. The default implementation
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* will take a buffer from the queue and optionally wait for a buffer to
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* be released when there are no buffers available.
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* @alloc_buffer: allocate a buffer. the default implementation allocates
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* buffers from the configured memory allocator and with the configured
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* parameters. All metadata that is present on the allocated buffer will
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* be marked as #GST_META_FLAG_POOLED and #GST_META_FLAG_LOCKED and will
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* not be removed from the buffer in @reset_buffer. The buffer should
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* have the GST_BUFFER_FLAG_TAG_MEMORY cleared.
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* @reset_buffer: reset the buffer to its state when it was freshly allocated.
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* The default implementation will clear the flags, timestamps and
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* will remove the metadata without the #GST_META_FLAG_POOLED flag (even
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* the metadata with #GST_META_FLAG_LOCKED). If the
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* #GST_BUFFER_FLAG_TAG_MEMORY was set, this function can also try to
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* restore the memory and clear the #GST_BUFFER_FLAG_TAG_MEMORY again.
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* @release_buffer: release a buffer back in the pool. The default
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* implementation will put the buffer back in the queue and notify any
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* blocking acquire_buffer calls when the #GST_BUFFER_FLAG_TAG_MEMORY
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* is not set on the buffer. If #GST_BUFFER_FLAG_TAG_MEMORY is set, the
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* buffer will be freed with @free_buffer.
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* @free_buffer: free a buffer. The default implementation unrefs the buffer.
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* @flush_start: enter the flushing state. (Since: 1.4)
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* @flush_stop: leave the flushign state. (Since: 1.4)
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*
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* The GstBufferPool class.
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*/
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struct _GstBufferPoolClass {
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GstObjectClass object_class;
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/*< public >*/
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const gchar ** (*get_options) (GstBufferPool *pool);
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gboolean (*set_config) (GstBufferPool *pool, GstStructure *config);
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gboolean (*start) (GstBufferPool *pool);
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gboolean (*stop) (GstBufferPool *pool);
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GstFlowReturn (*acquire_buffer) (GstBufferPool *pool, GstBuffer **buffer,
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GstBufferPoolAcquireParams *params);
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GstFlowReturn (*alloc_buffer) (GstBufferPool *pool, GstBuffer **buffer,
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GstBufferPoolAcquireParams *params);
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void (*reset_buffer) (GstBufferPool *pool, GstBuffer *buffer);
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void (*release_buffer) (GstBufferPool *pool, GstBuffer *buffer);
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void (*free_buffer) (GstBufferPool *pool, GstBuffer *buffer);
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void (*flush_start) (GstBufferPool *pool);
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void (*flush_stop) (GstBufferPool *pool);
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/*< private >*/
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gpointer _gst_reserved[GST_PADDING - 2];
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};
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GST_API
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GType gst_buffer_pool_get_type (void);
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/* allocation */
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GST_API
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GstBufferPool * gst_buffer_pool_new (void);
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/* state management */
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GST_API
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gboolean gst_buffer_pool_set_active (GstBufferPool *pool, gboolean active);
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GST_API
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gboolean gst_buffer_pool_is_active (GstBufferPool *pool);
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GST_API
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gboolean gst_buffer_pool_set_config (GstBufferPool *pool, GstStructure *config);
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GST_API
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GstStructure * gst_buffer_pool_get_config (GstBufferPool *pool);
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GST_API
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const gchar ** gst_buffer_pool_get_options (GstBufferPool *pool);
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GST_API
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gboolean gst_buffer_pool_has_option (GstBufferPool *pool, const gchar *option);
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GST_API
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void gst_buffer_pool_set_flushing (GstBufferPool *pool, gboolean flushing);
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/* helpers for configuring the config structure */
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GST_API
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void gst_buffer_pool_config_set_params (GstStructure *config, GstCaps *caps,
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guint size, guint min_buffers, guint max_buffers);
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GST_API
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gboolean gst_buffer_pool_config_get_params (GstStructure *config, GstCaps **caps,
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guint *size, guint *min_buffers, guint *max_buffers);
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GST_API
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void gst_buffer_pool_config_set_allocator (GstStructure *config, GstAllocator *allocator,
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const GstAllocationParams *params);
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GST_API
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gboolean gst_buffer_pool_config_get_allocator (GstStructure *config, GstAllocator **allocator,
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GstAllocationParams *params);
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/* options */
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GST_API
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guint gst_buffer_pool_config_n_options (GstStructure *config);
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GST_API
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void gst_buffer_pool_config_add_option (GstStructure *config, const gchar *option);
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GST_API
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const gchar * gst_buffer_pool_config_get_option (GstStructure *config, guint index);
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GST_API
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gboolean gst_buffer_pool_config_has_option (GstStructure *config, const gchar *option);
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GST_API
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gboolean gst_buffer_pool_config_validate_params (GstStructure *config, GstCaps *caps,
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guint size, guint min_buffers, guint max_buffers);
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/* buffer management */
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GST_API
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GstFlowReturn gst_buffer_pool_acquire_buffer (GstBufferPool *pool, GstBuffer **buffer,
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GstBufferPoolAcquireParams *params);
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GST_API
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void gst_buffer_pool_release_buffer (GstBufferPool *pool, GstBuffer *buffer);
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G_END_DECLS
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#endif /* __GST_BUFFER_POOL_H__ */
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