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b67be761e0
Reset the buffer not after we acquire but before we release into the pool. This makes sure that the pool only has buffers in a clean state and that we can set extra metadata on buffers in the acquire method. this means that we need to remove an argument from the method.
207 lines
8.7 KiB
C
207 lines
8.7 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., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, 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: don't wait for buffer. This makes the
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* acquire_buffer method return GST_FLOW_EOS.
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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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/**
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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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typedef 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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} GstBufferPoolAcquireParams;
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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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* @object: the parent structure
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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.
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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).
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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.
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* @free_buffer: free a buffer. The default implementation unrefs the buffer.
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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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/* vmethods */
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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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/*< private >*/
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gpointer _gst_reserved[GST_PADDING];
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};
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GType gst_buffer_pool_get_type (void);
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/* allocation */
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GstBufferPool * gst_buffer_pool_new (void);
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/* state management */
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gboolean gst_buffer_pool_set_active (GstBufferPool *pool, gboolean active);
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gboolean gst_buffer_pool_is_active (GstBufferPool *pool);
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gboolean gst_buffer_pool_set_config (GstBufferPool *pool, GstStructure *config);
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GstStructure * gst_buffer_pool_get_config (GstBufferPool *pool);
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const gchar ** gst_buffer_pool_get_options (GstBufferPool *pool);
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gboolean gst_buffer_pool_has_option (GstBufferPool *pool, const gchar *option);
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/* helpers for configuring the config structure */
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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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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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void gst_buffer_pool_config_set_allocator (GstStructure *config, GstAllocator *allocator,
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const GstAllocationParams *params);
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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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guint gst_buffer_pool_config_n_options (GstStructure *config);
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void gst_buffer_pool_config_add_option (GstStructure *config, const gchar *option);
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const gchar * gst_buffer_pool_config_get_option (GstStructure *config, guint index);
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gboolean gst_buffer_pool_config_has_option (GstStructure *config, const gchar *option);
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/* buffer management */
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GstFlowReturn gst_buffer_pool_acquire_buffer (GstBufferPool *pool, GstBuffer **buffer,
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GstBufferPoolAcquireParams *params);
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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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