/* GStreamer * Copyright (C) 2010 Wim Taymans * * gstbufferpool.h: Header for GstBufferPool object * * This library is free software; you can redistribute it and/or * modify it under the terms of the GNU Library General Public * License as published by the Free Software Foundation; either * version 2 of the License, or (at your option) any later version. * * This library is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Library General Public License for more details. * * You should have received a copy of the GNU Library General Public * License along with this library; if not, write to the * Free Software Foundation, Inc., 59 Temple Place - Suite 330, * Boston, MA 02111-1307, USA. */ #ifndef __GST_BUFFER_POOL_H__ #define __GST_BUFFER_POOL_H__ #include #include #include #include #include #include G_BEGIN_DECLS typedef struct _GstBufferPoolPrivate GstBufferPoolPrivate; typedef struct _GstBufferPoolClass GstBufferPoolClass; /** * GST_BUFFER_POOL_TRACE_NAME: * * The name used for tracing memory allocations. */ #define GST_BUFFER_POOL_TRACE_NAME "GstBufferPool" #define GST_TYPE_BUFFER_POOL (gst_buffer_pool_get_type()) #define GST_IS_BUFFER_POOL(obj) (G_TYPE_CHECK_INSTANCE_TYPE ((obj), GST_TYPE_BUFFER_POOL)) #define GST_IS_BUFFER_POOL_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass), GST_TYPE_BUFFER_POOL)) #define GST_BUFFER_POOL_GET_CLASS(obj) (G_TYPE_INSTANCE_GET_CLASS ((obj), GST_TYPE_BUFFER_POOL, GstBufferPoolClass)) #define GST_BUFFER_POOL(obj) (G_TYPE_CHECK_INSTANCE_CAST ((obj), GST_TYPE_BUFFER_POOL, GstBufferPool)) #define GST_BUFFER_POOL_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST ((klass), GST_TYPE_BUFFER_POOL, GstBufferPoolClass)) #define GST_BUFFER_POOL_CAST(obj) ((GstBufferPool *)(obj)) /** * GstBufferPoolFlags: * @GST_BUFFER_POOL_FLAG_NONE: no flags * @GST_BUFFER_POOL_FLAG_KEY_UNIT: buffer is keyframe * @GST_BUFFER_POOL_FLAG_DONTWAIT: don't wait for buffer. This makes the * acquire_buffer method return GST_FLOW_UNEXPECTED. * @GST_BUFFER_POOL_FLAG_DISCONT: buffer is discont * * Additional flags to control the allocation of a buffer */ typedef enum { GST_BUFFER_POOL_FLAG_NONE = 0, GST_BUFFER_POOL_FLAG_KEY_UNIT = (1 << 0), GST_BUFFER_POOL_FLAG_DONTWAIT = (1 << 1), GST_BUFFER_POOL_FLAG_DISCONT = (1 << 2), GST_BUFFER_POOL_FLAG_LAST = (1 << 16), } GstBufferPoolFlags; /** * GstBufferPoolParams: * @format: the format of @start and @stop * @start: the start position * @stop: the stop position * @flags: additional flags * * Parameters passed to the gst_buffer_pool_acquire_buffer() function to control the * allocation of the buffer. * * The default implementation ignores the @start and @stop members but other * implementations can use this extra information to decide what buffer to * return. */ typedef struct _GstBufferPoolParams { GstFormat format; gint64 start; gint64 stop; GstBufferPoolFlags flags; } GstBufferPoolParams; /** * GST_BUFFER_POOL_IS_FLUSHING: * @pool: a GstBufferPool * * Check if the bufferpool is flushing. Subclasses might want to check the * state of the pool in the acquire function. */ #define GST_BUFFER_POOL_IS_FLUSHING(pool) (g_atomic_int_get (&pool->flushing)) /** * GstBufferPool: * @object: the parent structure * * The structure of a #GstBufferPool. Use the associated macros to access the public * variables. */ struct _GstBufferPool { GstObject object; /*< private >*/ gboolean active; gboolean flushing; gboolean started; gint outstanding; GstAtomicQueue *queue; GstPoll *poll; gboolean configured; GstStructure *config; GstBufferPoolPrivate *priv; gpointer _gst_reserved[GST_PADDING]; }; /** * GstBufferPoolClass: * @object_class: Object parent class * @get_options: get a list of options supported by this pool * @set_config: apply the bufferpool configuration. The default configuration * will parse the default config parameters * @start: start the bufferpool. The default implementation will preallocate * min-buffers buffers and put them in the queue * @stop: stop the bufferpool. the default implementation will free the * preallocated buffers. This function is called when all the buffers are * returned to the pool. * @acquire_buffer: get a new buffer from the pool. The default implementation * will take a buffer from the queue and optionally wait for a buffer to * be released when there are no buffers available. * @alloc_buffer: allocate a buffer. the default implementation allocates * buffers from the default memory allocator and with the configured * size, prefix and alignment. * @reset_buffer: reset the buffer to its state when it was freshly allocated. * The default implementation will clear the flags and timestamps. * @release_buffer: release a buffer back in the pool. The default * implementation will put the buffer back in the queue and notify any * blocking acquire_buffer calls. * @free_buffer: free a buffer. The default implementation unrefs the buffer. * * The GstBufferPool class. */ struct _GstBufferPoolClass { GstObjectClass object_class; /* vmethods */ const gchar ** (*get_options) (GstBufferPool *pool); gboolean (*set_config) (GstBufferPool *pool, GstStructure *config); gboolean (*start) (GstBufferPool *pool); gboolean (*stop) (GstBufferPool *pool); GstFlowReturn (*acquire_buffer) (GstBufferPool *pool, GstBuffer **buffer, GstBufferPoolParams *params); GstFlowReturn (*alloc_buffer) (GstBufferPool *pool, GstBuffer **buffer, GstBufferPoolParams *params); void (*reset_buffer) (GstBufferPool *pool, GstBuffer *buffer, GstBufferPoolParams *params); void (*release_buffer) (GstBufferPool *pool, GstBuffer *buffer); void (*free_buffer) (GstBufferPool *pool, GstBuffer *buffer); gpointer _gst_reserved[GST_PADDING]; }; GType gst_buffer_pool_get_type (void); /* allocation */ GstBufferPool * gst_buffer_pool_new (void); /* state management */ gboolean gst_buffer_pool_set_active (GstBufferPool *pool, gboolean active); gboolean gst_buffer_pool_is_active (GstBufferPool *pool); gboolean gst_buffer_pool_set_config (GstBufferPool *pool, GstStructure *config); GstStructure * gst_buffer_pool_get_config (GstBufferPool *pool); const gchar ** gst_buffer_pool_get_options (GstBufferPool *pool); gboolean gst_buffer_pool_has_option (GstBufferPool *pool, const gchar *option); /* helpers for configuring the config structure */ void gst_buffer_pool_config_set (GstStructure *config, const GstCaps *caps, guint size, guint min_buffers, guint max_buffers, guint prefix, guint align); gboolean gst_buffer_pool_config_get (GstStructure *config, const GstCaps **caps, guint *size, guint *min_buffers, guint *max_buffers, guint *prefix, guint *align); /* options */ guint gst_buffer_pool_config_n_options (GstStructure *config); void gst_buffer_pool_config_add_option (GstStructure *config, const gchar *option); const gchar * gst_buffer_pool_config_get_option (GstStructure *config, guint index); gboolean gst_buffer_pool_config_has_option (GstStructure *config, const gchar *option); /* buffer management */ GstFlowReturn gst_buffer_pool_acquire_buffer (GstBufferPool *pool, GstBuffer **buffer, GstBufferPoolParams *params); void gst_buffer_pool_release_buffer (GstBufferPool *pool, GstBuffer *buffer); G_END_DECLS #endif /* __GST_BUFFER_POOL_H__ */