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memory: add API for handling memory blocks

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Adds some API to handle memory blocks.
This commit is contained in:
Wim Taymans 2011-03-18 18:35:42 +01:00
parent c5983ac47c
commit 4fef929ed0
1 changed files with 110 additions and 0 deletions
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/* GStreamer
* Copyright (C) 2009 Wim Taymans <wim.taymans@gmail.be>
*
* gstmemory.h: Header for memory blocks
*
* 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_MEMORY_H__
#define __GST_MEMORY_H__
G_BEGIN_DECLS
typedef struct _GstMemory GstMemory;
typedef struct _GstMemoryInfo GstMemoryInfo;
/**
* GstMemory:
* @info: pointer to the #GstMemoryInfo
*
* Base structure for memory implementations. Custom memory will put this structure
* as the first member of their structure.
*/
struct _GstMemory {
const GstMemoryInfo *info;
gint refcount;
};
/**
* GST_MEMORY_TRACE_NAME:
*
* The name used for tracing memory allocations.
*/
#define GST_MEMORY_TRACE_NAME "GstMemory"
typedef gsize (*GstMemoryGetSizesFunction) (GstMemory *mem, gsize *maxsize);
typedef void (*GstMemorySetSizeFunction) (GstMemory *mem, gsize size);
typedef gpointer (*GstMemoryMapFunction) (GstMemory *mem, gsize offset, gsize *size,
GstMapFlags flags);
typedef gboolean (*GstMemoryUnmapFunction) (GstMemory *mem, gpointer data, gsize size);
typedef GstMemory * (*GstMemoryCopyFunction) (GstMemory *mem);
/**
* GstMemoryInfo:
* @impl: tag indentifying the implementor of the api
* @size: size of the memory structure
*
* The #GstMemoryInfo provides information about a specific metadata
* structure.
*/
struct _GstMemoryInfo {
GQuark impl;
gsize size;
GstMemoryGetSizesFunction get_sizes;
GstMemorySetSizeFunction set_size;
GstMemoryMapFunction map;
GstMemoryUnmapFunction unmap;
GstMemoryCopyFunction copy;
};
void _gst_memory_init (void);
GstMemory * gst_memory_ref (GstMemory *mem);
void gst_memory_unref (GstMemory *mem);
gsize gst_memory_get_sizes (GstMemory *mem, gsize *maxsize);
void gst_memory_set_size (GstMemory *mem, gsize size);
gpointer gst_memory_map (GstMemory *mem, gsize *size, gsize *maxsize,
GstMapFlags flags);
gboolean gst_memory_unmap (GstMemory *mem, gpointer data, gsize size);
GstMemory * gst_memory_copy (GstMemory *mem);
GstMemory * gst_memory_new_wrapped (gpointer data, GFreeFunc free_func,
gsize maxsize, gsize offset, gsize size);
GstMemory * gst_memory_new_alloc (gsize maxsize, gsize align);
#if 0
const GstMemoryInfo * gst_memory_register (const gchar *impl, gsize size,
GstMemoryGetSizesFunction get_sizes,
GstMemorySetSizeFunction set_size,
GstMemoryMapFunction map,
GstMemoryUnmapFunction unmap);
const GstMemoryInfo * gst_memory_get_info (const gchar * impl);
#endif
G_END_DECLS
#endif /* __GST_MEMORY_H__ */