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416 lines
13 KiB
C
416 lines
13 KiB
C
/* GStreamer
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* Copyright (C) 2009 Wim Taymans <wim.taymans@gmail.be>
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*
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* gstmemory.h: Header for memory blocks
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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_MEMORY_H__
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#define __GST_MEMORY_H__
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#include <gst/gstconfig.h>
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#include <glib-object.h>
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G_BEGIN_DECLS
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#define GST_TYPE_MEMORY (gst_memory_get_type())
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GType gst_memory_get_type(void);
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#define GST_TYPE_ALLOCATOR (gst_allocator_get_type())
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GType gst_allocator_get_type(void);
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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 _GstMemory GstMemory;
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typedef struct _GstMemoryInfo GstMemoryInfo;
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typedef struct _GstAllocator GstAllocator;
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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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#define GST_MEMORY_CAST(mem) ((GstMemory *)(mem))
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/**
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* GstMemoryFlags:
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* @GST_MEMORY_FLAG_READONLY: memory is readonly. It is not allowed to map the
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* memory with #GST_MAP_WRITE.
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* @GST_MEMORY_FLAG_NO_SHARE: memory must not be shared. Copies will have to be
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* made when this memory needs to be shared between buffers.
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* @GST_MEMORY_FLAG_ZERO_PREFIXED: the memory prefix is filled with 0 bytes
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* @GST_MEMORY_FLAG_ZERO_PADDED: the memory padding is filled with 0 bytes
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* @GST_MEMORY_FLAG_LAST: first flag that can be used for custom purposes
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*
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* Flags for wrapped memory.
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*/
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typedef enum {
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GST_MEMORY_FLAG_READONLY = (1 << 0),
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GST_MEMORY_FLAG_NO_SHARE = (1 << 1),
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GST_MEMORY_FLAG_ZERO_PREFIXED = (1 << 2),
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GST_MEMORY_FLAG_ZERO_PADDED = (1 << 3),
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GST_MEMORY_FLAG_LAST = (1 << 16)
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} GstMemoryFlags;
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/**
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* GST_MEMORY_FLAGS:
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* @mem: a #GstMemory.
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*
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* A flags word containing #GstMemoryFlags flags set on @mem
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*/
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#define GST_MEMORY_FLAGS(mem) (GST_MEMORY_CAST (mem)->flags)
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/**
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* GST_MEMORY_FLAG_IS_SET:
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* @mem: a #GstMemory.
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* @flag: the #GstMemoryFlags to check.
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*
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* Gives the status of a specific flag on a @mem.
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*/
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#define GST_MEMORY_FLAG_IS_SET(mem,flag) !!(GST_MEMORY_FLAGS (mem) & (flag))
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/**
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* GST_MEMORY_FLAG_UNSET:
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* @mem: a #GstMemory.
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* @flag: the #GstMemoryFlags to clear.
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*
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* Clear a specific flag on a @mem.
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*/
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#define GST_MEMORY_FLAG_UNSET(mem,flag) (GST_MEMORY_FLAGS (mem) &= ~(flag))
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/**
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* GST_MEMORY_IS_READONLY:
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* @mem: a #GstMemory.
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*
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* Check if @mem is readonly.
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*/
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#define GST_MEMORY_IS_READONLY(mem) GST_MEMORY_FLAG_IS_SET(mem,GST_MEMORY_FLAG_READONLY)
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/**
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* GST_MEMORY_IS_ZERO_PREFIXED:
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* @mem: a #GstMemory.
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*
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* Check if the prefix in @mem is 0 filled.
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*/
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#define GST_MEMORY_IS_ZERO_PREFIXED(mem) GST_MEMORY_FLAG_IS_SET(mem,GST_MEMORY_FLAG_ZERO_PREFIXED)
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/**
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* GST_MEMORY_IS_ZERO_PADDED:
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* @mem: a #GstMemory.
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*
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* Check if the padding in @mem is 0 filled.
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*/
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#define GST_MEMORY_IS_ZERO_PADDED(mem) GST_MEMORY_FLAG_IS_SET(mem,GST_MEMORY_FLAG_ZERO_PADDED)
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/**
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* GstMemory:
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* @allocator: pointer to the #GstAllocator
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* @flags: memory flags
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* @refcount: refcount
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* @parent: parent memory block
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* @state: private state
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* @maxsize: the maximum size allocated
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* @align: the alignment of the memory
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* @offset: the offset where valid data starts
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* @size: the size of valid data
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*
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* Base structure for memory implementations. Custom memory will put this structure
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* as the first member of their structure.
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*/
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struct _GstMemory {
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GstAllocator *allocator;
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GstMemoryFlags flags;
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gint refcount;
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GstMemory *parent;
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volatile gint state;
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gsize maxsize;
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gsize align;
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gsize offset;
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gsize size;
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};
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/**
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* GstMapFlags:
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* @GST_MAP_READ: map for read access
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* @GST_MAP_WRITE: map for write access
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* @GST_MAP_FLAG_LAST: first flag that can be used for custom purposes
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*
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* Flags used when mapping memory
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*/
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typedef enum {
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GST_MAP_READ = (1 << 0),
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GST_MAP_WRITE = (1 << 1),
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GST_MAP_FLAG_LAST = (1 << 16)
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} GstMapFlags;
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/**
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* GstMapInfo:
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* @memory: a pointer to the mapped memory
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* @flags: flags used when mapping the memory
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* @data: a pointer to the mapped data
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* @size: the valid size in @data
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* @maxsize: the maximum bytes in @data
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* @user_data: extra private user_data that the implementation of the memory
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* can use to store extra info.
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*
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* A structure containing the result of a map operation such as
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* gst_memory_map(). It contains the data and size.
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*/
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typedef struct {
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GstMemory *memory;
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GstMapFlags flags;
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guint8 *data;
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gsize size;
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gsize maxsize;
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/*< private >*/
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gpointer user_data[4];
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} GstMapInfo;
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/**
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* GST_MAP_INFO_INIT:
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*
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* Initializer for #GstMapInfo
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*/
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#define GST_MAP_INFO_INIT { NULL, 0, NULL, 0, 0, }
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/**
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* GST_MAP_READWRITE:
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*
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* Map for readwrite access
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*/
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#define GST_MAP_READWRITE (GST_MAP_READ | GST_MAP_WRITE)
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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 disired 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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* GstAllocatorAllocFunction:
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* @allocator: a #GstAllocator
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* @size: the size
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* @params: allocator params
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* @user_data: user data
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*
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* Allocate a new #GstMemory from @allocator that can hold at least @size
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* bytes (+ padding) and is aligned to (@align + 1) bytes.
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*
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* The offset and size of the memory should be set and the prefix/padding must
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* be filled with 0 if @params flags contains #GST_MEMORY_FLAG_ZERO_PREFIXED and
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* #GST_MEMORY_FLAG_ZERO_PADDED respectively.
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*
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* @user_data is the data that was used when creating @allocator.
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*
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* Returns: a newly allocated #GstMemory. Free with gst_memory_unref()
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*/
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typedef GstMemory * (*GstAllocatorAllocFunction) (GstAllocator *allocator,
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gsize size, GstAllocationParams *params,
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gpointer user_data);
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/**
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* GstMemoryMapFunction:
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* @mem: a #GstMemory
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* @maxsize: size to map
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* @flags: access mode for the memory
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*
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* Get the memory of @mem that can be accessed according to the mode specified
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* in @flags. The function should return a pointer that contains at least
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* @maxsize bytes.
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*
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* Returns: a pointer to memory of which at least @maxsize bytes can be
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* accessed according to the access pattern in @flags.
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*/
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typedef gpointer (*GstMemoryMapFunction) (GstMemory *mem, gsize maxsize, GstMapFlags flags);
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/**
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* GstMemoryUnmapFunction:
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* @mem: a #GstMemory
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*
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* Return the pointer previously retrieved with gst_memory_map().
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*
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* Returns: %TRUE on success.
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*/
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typedef void (*GstMemoryUnmapFunction) (GstMemory *mem);
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/**
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* GstMemoryFreeFunction:
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* @mem: a #GstMemory
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*
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* Free the memory used by @mem. This function is usually called when the
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* refcount of the @mem has reached 0.
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*/
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typedef void (*GstMemoryFreeFunction) (GstMemory *mem);
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/**
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* GstMemoryCopyFunction:
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* @mem: a #GstMemory
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* @offset: an offset
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* @size: a size or -1
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*
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* Copy @size bytes from @mem starting at @offset and return them wrapped in a
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* new GstMemory object.
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* If @size is set to -1, all bytes starting at @offset are copied.
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*
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* Returns: a new #GstMemory object wrapping a copy of the requested region in
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* @mem.
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*/
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typedef GstMemory * (*GstMemoryCopyFunction) (GstMemory *mem, gssize offset, gssize size);
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/**
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* GstMemoryShareFunction:
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* @mem: a #GstMemory
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* @offset: an offset
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* @size: a size or -1
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*
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* Share @size bytes from @mem starting at @offset and return them wrapped in a
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* new GstMemory object. If @size is set to -1, all bytes starting at @offset are
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* shared. This function does not make a copy of the bytes in @mem.
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*
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* Returns: a new #GstMemory object sharing the requested region in @mem.
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*/
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typedef GstMemory * (*GstMemoryShareFunction) (GstMemory *mem, gssize offset, gssize size);
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/**
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* GstMemoryIsSpanFunction:
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* @mem1: a #GstMemory
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* @mem2: a #GstMemory
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* @offset: a result offset
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*
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* Check if @mem1 and @mem2 occupy contiguous memory and return the offset of
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* @mem1 in the parent buffer in @offset.
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*
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* Returns: %TRUE if @mem1 and @mem2 are in contiguous memory.
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*/
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typedef gboolean (*GstMemoryIsSpanFunction) (GstMemory *mem1, GstMemory *mem2, gsize *offset);
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/**
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* GstMemoryInfo:
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* @mem_type: the memory type this allocator provides
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* @alloc: the implementation of the GstAllocatorAllocFunction
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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_free: the implementation of the GstMemoryFreeFunction
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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 #GstMemoryInfo is used to register new memory allocators and contain
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* the implementations for various memory operations.
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*/
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struct _GstMemoryInfo {
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const gchar *mem_type;
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GstAllocatorAllocFunction alloc;
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GstMemoryMapFunction mem_map;
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GstMemoryUnmapFunction mem_unmap;
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GstMemoryFreeFunction mem_free;
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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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};
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/**
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* GstAllocator:
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*
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* An opaque type returned from gst_allocator_new() or gst_allocator_find()
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* that can be used to allocator memory.
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*/
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/* allocators */
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GstAllocator * gst_allocator_new (const GstMemoryInfo * info,
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gpointer user_data, GDestroyNotify notify);
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const gchar * gst_allocator_get_memory_type (GstAllocator * allocator);
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GstAllocator * gst_allocator_ref (GstAllocator * allocator);
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void gst_allocator_unref (GstAllocator * allocator);
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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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/* allocating memory blocks */
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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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GstMemory * gst_allocator_alloc (GstAllocator * allocator, gsize size,
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GstAllocationParams *params);
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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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/* refcounting */
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GstMemory * gst_memory_ref (GstMemory *mem);
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void gst_memory_unref (GstMemory *mem);
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gboolean gst_memory_is_exclusive (GstMemory *mem);
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/* getting/setting memory properties */
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gsize gst_memory_get_sizes (GstMemory *mem, gsize *offset, gsize *maxsize);
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void gst_memory_resize (GstMemory *mem, gssize offset, gsize size);
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/* retrieving data */
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GstMemory * gst_memory_make_mapped (GstMemory *mem, GstMapInfo *info, GstMapFlags flags);
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gboolean gst_memory_map (GstMemory *mem, GstMapInfo *info, GstMapFlags flags);
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void gst_memory_unmap (GstMemory *mem, GstMapInfo *info);
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/* copy and subregions */
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GstMemory * gst_memory_copy (GstMemory *mem, gssize offset, gssize size);
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GstMemory * gst_memory_share (GstMemory *mem, gssize offset, gssize size);
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/* span memory */
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gboolean gst_memory_is_span (GstMemory *mem1, GstMemory *mem2, gsize *offset);
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G_END_DECLS
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#endif /* __GST_MEMORY_H__ */
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