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