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/* GStreamer
* Copyright (C) 2009 Wim Taymans <wim.taymans@gmail.be>
*
* gstallocator.h: Header for memory allocation
*
* 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., 51 Franklin St, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
#ifndef __GST_ALLOCATOR_H__
#define __GST_ALLOCATOR_H__
#include <gst/gstmemory.h>
G_BEGIN_DECLS
typedef struct _GstAllocatorPrivate GstAllocatorPrivate;
typedef struct _GstAllocatorClass GstAllocatorClass;
#define GST_TYPE_ALLOCATOR (gst_allocator_get_type())
#define GST_IS_ALLOCATOR(obj) (G_TYPE_CHECK_INSTANCE_TYPE ((obj), GST_TYPE_ALLOCATOR))
#define GST_IS_ALLOCATOR_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass), GST_TYPE_ALLOCATOR))
#define GST_ALLOCATOR_GET_CLASS(obj) (G_TYPE_INSTANCE_GET_CLASS ((obj), GST_TYPE_ALLOCATOR, GstAllocatorClass))
#define GST_ALLOCATOR(obj) (G_TYPE_CHECK_INSTANCE_CAST ((obj), GST_TYPE_ALLOCATOR, GstAllocator))
#define GST_ALLOCATOR_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST ((klass), GST_TYPE_ALLOCATOR, GstAllocatorClass))
#define GST_ALLOCATOR_CAST(obj) ((GstAllocator *)(obj))
#define GST_TYPE_ALLOCATION_PARAMS (gst_allocation_params_get_type())
GType gst_allocation_params_get_type(void);
typedef struct _GstAllocationParams GstAllocationParams;
/**
* gst_memory_alignment:
*
* The default memory alignment in bytes - 1
* an alignment of 7 would be the same as what malloc() guarantees.
*/
GST_EXPORT gsize gst_memory_alignment;
/**
* GST_ALLOCATOR_SYSMEM:
*
* The allocator name for the default system memory allocator
*/
#define GST_ALLOCATOR_SYSMEM "SystemMemory"
/**
* GstAllocationParams:
* @flags: flags to control allocation
* @align: the desired alignment of the memory
* @prefix: the desired prefix
* @padding: the desired padding
*
* Parameters to control the allocation of memory
*/
struct _GstAllocationParams {
GstMemoryFlags flags;
gsize align;
gsize prefix;
gsize padding;
/*< private >*/
gpointer _gst_reserved[GST_PADDING];
};
/**
* GstAllocatorFlags:
* @GST_ALLOCATOR_FLAG_CUSTOM_ALLOC: The allocator has a custom alloc function.
* @GST_ALLOCATOR_FLAG_LAST: first flag that can be used for custom purposes
*
* Flags for allocators.
*/
typedef enum {
GST_ALLOCATOR_FLAG_CUSTOM_ALLOC = (GST_OBJECT_FLAG_LAST << 0),
GST_ALLOCATOR_FLAG_LAST = (GST_OBJECT_FLAG_LAST << 16)
} GstAllocatorFlags;
/**
* GstAllocator:
* @mem_map: the implementation of the GstMemoryMapFunction
* @mem_unmap: the implementation of the GstMemoryUnmapFunction
* @mem_copy: the implementation of the GstMemoryCopyFunction
* @mem_share: the implementation of the GstMemoryShareFunction
* @mem_is_span: the implementation of the GstMemoryIsSpanFunction
*
* The #GstAllocator is used to create new memory.
*/
struct _GstAllocator
{
GstObject object;
const gchar *mem_type;
/*< public >*/
GstMemoryMapFunction mem_map;
GstMemoryUnmapFunction mem_unmap;
GstMemoryCopyFunction mem_copy;
GstMemoryShareFunction mem_share;
GstMemoryIsSpanFunction mem_is_span;
/*< private >*/
gpointer _gst_reserved[GST_PADDING];
GstAllocatorPrivate *priv;
};
/**
* GstAllocatorClass:
* @object_class: Object parent class
* @alloc: implementation that acquires memory
* @free: implementation that releases memory
*
* The #GstAllocator is used to create new memory.
*/
struct _GstAllocatorClass {
GstObjectClass object_class;
/*< public >*/
GstMemory * (*alloc) (GstAllocator *allocator, gsize size,
GstAllocationParams *params);
void (*free) (GstAllocator *allocator, GstMemory *memory);
/*< private >*/
gpointer _gst_reserved[GST_PADDING];
};
GType gst_allocator_get_type(void);
/* allocators */
void gst_allocator_register (const gchar *name, GstAllocator *allocator);
GstAllocator * gst_allocator_find (const gchar *name);
void gst_allocator_set_default (GstAllocator * allocator);
/* allocation parameters */
void gst_allocation_params_init (GstAllocationParams *params);
GstAllocationParams *
gst_allocation_params_copy (const GstAllocationParams *params) G_GNUC_MALLOC;
void gst_allocation_params_free (GstAllocationParams *params);
/* allocating memory blocks */
GstMemory * gst_allocator_alloc (GstAllocator * allocator, gsize size,
GstAllocationParams *params);
void gst_allocator_free (GstAllocator * allocator, GstMemory *memory);
GstMemory * gst_memory_new_wrapped (GstMemoryFlags flags, gpointer data, gsize maxsize,
gsize offset, gsize size, gpointer user_data,
GDestroyNotify notify);
G_END_DECLS
#endif /* __GST_ALLOCATOR_H__ */
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