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280 lines
8.6 KiB
C
280 lines
8.6 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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typedef struct _GstMemory GstMemory;
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typedef struct _GstMemoryInfo GstMemoryInfo;
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typedef struct _GstMemoryImpl GstMemoryImpl;
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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_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_LAST = (1 << 24)
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} GstMemoryFlags;
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/**
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* GST_MEMORY_IS_WRITABLE:
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* @mem: a #GstMemory
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*
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* Check if @mem is writable.
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*/
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#define GST_MEMORY_IS_WRITABLE(mem) (((mem)->refcount == 1) && \
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(((mem)->parent == NULL) || ((mem)->parent->refcount == 1)) && \
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(((mem)->flags & GST_MEMORY_FLAG_READONLY) == 0))
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/**
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* GstMemory:
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* @impl: pointer to the #GstMemoryImpl
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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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*
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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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const GstMemoryImpl *impl;
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GstMemoryFlags flags;
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gint refcount;
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GstMemory *parent;
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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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*
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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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} GstMapFlags;
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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_MEMORY_TRACE_NAME:
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*
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* The name used for tracing memory allocations.
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*/
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#define GST_MEMORY_TRACE_NAME "GstMemory"
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/**
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* GstMemoryGetSizesFunction:
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* @mem: a #GstMemory
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* @maxsize: result pointer for maxsize
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*
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* Retrieve the size and maxsize of @mem.
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*
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* Returns: the size of @mem and the maximum allocated size in @maxsize.
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*/
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typedef gsize (*GstMemoryGetSizesFunction) (GstMemory *mem, gsize *maxsize);
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/**
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* GstMemoryResizeFunction:
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* @mem: a #GstMemory
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* @offset: the new offset
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* @size: the new size
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*
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* Adjust the size and offset of @mem. @offset bytes will be skipped from the
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* current first byte in @mem as retrieved with gst_memory_map() and the new
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* size will be set to @size.
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*
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* @size can be set to -1, which will only adjust the offset.
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*/
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typedef void (*GstMemoryResizeFunction) (GstMemory *mem, gsize offset, gsize size);
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/**
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* GstMemoryMapFunction:
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* @mem: a #GstMemory
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* @size: pointer for the size
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* @maxsize: pointer for the maxsize
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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. @size and @maxsize will respectively contain the current amount of
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* valid bytes in the returned memory and the maximum allocated memory.
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* @size and @maxsize can optionally be set to NULL.
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*
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* Returns: a pointer to memory. @size bytes are currently used from the
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* returned pointer and @maxsize bytes can potentially be used.
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*/
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typedef gpointer (*GstMemoryMapFunction) (GstMemory *mem, gsize *size, gsize *maxsize,
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GstMapFlags flags);
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/**
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* GstMemoryUnmapFunction:
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* @mem: a #GstMemory
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* @data: the data pointer
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* @size: the new size
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*
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* Return the pointer previously retrieved with gst_memory_map() and adjust the
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* size of the memory with @size. @size can optionally be set to -1 to not
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* modify the size.
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*
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* Returns: %TRUE on success.
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*/
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typedef gboolean (*GstMemoryUnmapFunction) (GstMemory *mem, gpointer data, gsize size);
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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
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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, gsize offset, gsize 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
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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, gsize offset, gsize 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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* @get_sizes: the implementation of the GstMemoryGetSizesFunction
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* @resize: the implementation of the GstMemoryResizeFunction
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* @map: the implementation of the GstMemoryMapFunction
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* @unmap: the implementation of the GstMemoryUnmapFunction
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* @free: the implementation of the GstMemoryFreeFunction
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* @copy: the implementation of the GstMemoryCopyFunction
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* @share: the implementation of the GstMemoryShareFunction
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* @is_span: the implementation of the GstMemoryIsSpanFunction
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*
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* The #GstMemoryInfo is used to register new memory implementations 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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GstMemoryGetSizesFunction get_sizes;
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GstMemoryResizeFunction resize;
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GstMemoryMapFunction map;
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GstMemoryUnmapFunction unmap;
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GstMemoryFreeFunction free;
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GstMemoryCopyFunction copy;
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GstMemoryShareFunction share;
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GstMemoryIsSpanFunction is_span;
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};
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void _gst_memory_init (void);
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/* allocating memory blocks */
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GstMemory * gst_memory_new_wrapped (GstMemoryFlags flags, gpointer data, GFreeFunc free_func,
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gsize maxsize, gsize offset, gsize size);
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GstMemory * gst_memory_new_alloc (gsize maxsize, gsize align);
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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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/* getting/setting memory properties */
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gsize gst_memory_get_sizes (GstMemory *mem, gsize *maxsize);
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void gst_memory_resize (GstMemory *mem, gsize offset, gsize size);
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/* retriveing data */
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gpointer gst_memory_map (GstMemory *mem, gsize *size, gsize *maxsize,
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GstMapFlags flags);
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gboolean gst_memory_unmap (GstMemory *mem, gpointer data, gsize size);
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/* copy and subregions */
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GstMemory * gst_memory_copy (GstMemory *mem, gsize offset, gsize size);
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GstMemory * gst_memory_share (GstMemory *mem, gsize offset, gsize 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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GstMemory * gst_memory_span (GstMemory **mem1, gsize len1, gsize offset,
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GstMemory **mem2, gsize len2, gsize size);
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const GstMemoryImpl * gst_memory_register (const gchar *name, const GstMemoryInfo *info);
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#if 0
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const GstMemoryInfo * gst_memory_get_info (const gchar * impl);
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#endif
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G_END_DECLS
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#endif /* __GST_MEMORY_H__ */
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