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42a8ffcd39
This makes C++ compilers a bit more happy without having the user of the constants cast. It also provides the correct type information to GI. https://bugzilla.gnome.org/show_bug.cgi?id=780923
376 lines
12 KiB
C
376 lines
12 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., 51 Franklin St, Fifth Floor,
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* Boston, MA 02110-1301, 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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#include <gst/gstminiobject.h>
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#include <gst/gstobject.h>
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G_BEGIN_DECLS
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GST_EXPORT GType _gst_memory_type;
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#define GST_TYPE_MEMORY (_gst_memory_type)
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GType gst_memory_get_type(void);
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typedef struct _GstMemory GstMemory;
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typedef struct _GstAllocator GstAllocator;
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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_PHYSICALLY_CONTIGUOUS: the memory is physically contiguous. (Since 1.2)
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* @GST_MEMORY_FLAG_NOT_MAPPABLE: the memory can't be mapped via gst_memory_map() without any preconditions. (Since 1.2)
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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 = GST_MINI_OBJECT_FLAG_LOCK_READONLY,
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GST_MEMORY_FLAG_NO_SHARE = (GST_MINI_OBJECT_FLAG_LAST << 0),
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GST_MEMORY_FLAG_ZERO_PREFIXED = (GST_MINI_OBJECT_FLAG_LAST << 1),
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GST_MEMORY_FLAG_ZERO_PADDED = (GST_MINI_OBJECT_FLAG_LAST << 2),
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GST_MEMORY_FLAG_PHYSICALLY_CONTIGUOUS = (GST_MINI_OBJECT_FLAG_LAST << 3),
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GST_MEMORY_FLAG_NOT_MAPPABLE = (GST_MINI_OBJECT_FLAG_LAST << 4),
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GST_MEMORY_FLAG_LAST = (GST_MINI_OBJECT_FLAG_LAST << 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_MINI_OBJECT_FLAGS (mem)
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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_MINI_OBJECT_FLAG_IS_SET (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_MINI_OBJECT_FLAG_UNSET (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_NO_SHARE:
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* @mem: a #GstMemory.
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*
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* Check if @mem cannot be shared between buffers
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*/
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#define GST_MEMORY_IS_NO_SHARE(mem) GST_MEMORY_FLAG_IS_SET(mem,GST_MEMORY_FLAG_NO_SHARE)
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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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* GST_MEMORY_IS_PHYSICALLY_CONTIGUOUS:
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* @mem: a #GstMemory.
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*
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* Check if @mem is physically contiguous.
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*
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* Since: 1.2
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*/
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#define GST_MEMORY_IS_PHYSICALLY_CONTIGUOUS(mem) GST_MEMORY_FLAG_IS_SET(mem,GST_MEMORY_FLAG_PHYSICALLY_CONTIGUOUS)
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/**
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* GST_MEMORY_IS_NOT_MAPPABLE:
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* @mem: a #GstMemory.
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*
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* Check if @mem can't be mapped via gst_memory_map() without any preconditions
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*
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* Since: 1.2
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*/
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#define GST_MEMORY_IS_NOT_MAPPABLE(mem) GST_MEMORY_FLAG_IS_SET(mem,GST_MEMORY_FLAG_NOT_MAPPABLE)
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/**
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* GstMemory:
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* @mini_object: parent structure
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* @allocator: pointer to the #GstAllocator
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* @parent: parent memory block
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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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GstMiniObject mini_object;
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GstAllocator *allocator;
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GstMemory *parent;
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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 = GST_LOCK_FLAG_READ,
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GST_MAP_WRITE = GST_LOCK_FLAG_WRITE,
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GST_MAP_FLAG_LAST = (1 << 16)
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} GstMapFlags;
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/**
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* GST_MAP_READWRITE: (value 3) (type GstMapFlags)
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*
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* GstMapFlags value alias for GST_MAP_READ | GST_MAP_WRITE
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*/
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#define GST_MAP_READWRITE ((GstMapFlags) (GST_MAP_READ | GST_MAP_WRITE))
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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: (array length=size): 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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/*< protected >*/
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gpointer user_data[4];
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/*< private >*/
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gpointer _gst_reserved[GST_PADDING];
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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, (GstMapFlags) 0, NULL, 0, 0, { NULL, NULL, NULL, NULL}, {NULL, NULL, NULL, NULL}}
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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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* GstMemoryMapFullFunction:
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* @mem: a #GstMemory
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* @info: the #GstMapInfo to map with
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* @maxsize: size to map
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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 @info's 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 @info's flags.
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*/
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typedef gpointer (*GstMemoryMapFullFunction) (GstMemory *mem, GstMapInfo * info, gsize maxsize);
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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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typedef void (*GstMemoryUnmapFunction) (GstMemory *mem);
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/**
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* GstMemoryUnmapFullFunction:
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* @mem: a #GstMemory
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* @info: a #GstMapInfo
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*
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* Return the pointer previously retrieved with gst_memory_map() with @info.
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*/
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typedef void (*GstMemoryUnmapFullFunction) (GstMemory *mem, GstMapInfo * info);
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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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void gst_memory_init (GstMemory *mem, GstMemoryFlags flags,
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GstAllocator *allocator, GstMemory *parent,
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gsize maxsize, gsize align,
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gsize offset, gsize size);
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gboolean gst_memory_is_type (GstMemory *mem, const gchar *mem_type);
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/* refcounting */
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/**
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* gst_memory_ref:
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* @memory: The memory to refcount
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*
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* Increase the refcount of this memory.
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*
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* Returns: (transfer full): @memory (for convenience when doing assignments)
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*/
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static inline GstMemory *
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gst_memory_ref (GstMemory * memory)
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{
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return (GstMemory *) gst_mini_object_ref (GST_MINI_OBJECT_CAST (memory));
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}
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/**
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* gst_memory_unref:
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* @memory: (transfer full): the memory to refcount
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*
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* Decrease the refcount of an memory, freeing it if the refcount reaches 0.
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*/
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static inline void
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gst_memory_unref (GstMemory * memory)
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{
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gst_mini_object_unref (GST_MINI_OBJECT_CAST (memory));
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}
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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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#define gst_memory_lock(m,f) gst_mini_object_lock (GST_MINI_OBJECT_CAST (m), (f))
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#define gst_memory_unlock(m,f) gst_mini_object_unlock (GST_MINI_OBJECT_CAST (m), (f))
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#define gst_memory_is_writable(m) gst_mini_object_is_writable (GST_MINI_OBJECT_CAST (m))
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#define gst_memory_make_writable(m) GST_MEMORY_CAST (gst_mini_object_make_writable (GST_MINI_OBJECT_CAST (m)))
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/* retrieving data */
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GstMemory * gst_memory_make_mapped (GstMemory *mem, GstMapInfo *info, GstMapFlags flags) G_GNUC_WARN_UNUSED_RESULT;
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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) G_GNUC_WARN_UNUSED_RESULT;
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GstMemory * gst_memory_share (GstMemory *mem, gssize offset, gssize size) G_GNUC_WARN_UNUSED_RESULT;
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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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#ifdef G_DEFINE_AUTOPTR_CLEANUP_FUNC
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G_DEFINE_AUTOPTR_CLEANUP_FUNC(GstMemory, gst_memory_unref)
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#endif
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#ifdef G_DEFINE_AUTOPTR_CLEANUP_FUNC
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G_DEFINE_AUTOPTR_CLEANUP_FUNC(GstAllocator, gst_object_unref)
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#endif
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G_END_DECLS
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#endif /* __GST_MEMORY_H__ */
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