2 * Copyright (C) 2009 Wim Taymans <wim.taymans@gmail.be>
4 * gstmemory.h: Header for memory blocks
6 * This library is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Library General Public
8 * License as published by the Free Software Foundation; either
9 * version 2 of the License, or (at your option) any later version.
11 * This library is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Library General Public License for more details.
16 * You should have received a copy of the GNU Library General Public
17 * License along with this library; if not, write to the
18 * Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
19 * Boston, MA 02110-1301, USA.
23 #ifndef __GST_MEMORY_H__
24 #define __GST_MEMORY_H__
26 #include <gst/gstconfig.h>
28 #include <glib-object.h>
29 #include <gst/gstminiobject.h>
30 #include <gst/gstobject.h>
34 GST_EXPORT GType _gst_memory_type;
35 #define GST_TYPE_MEMORY (_gst_memory_type)
36 GType gst_memory_get_type(void);
38 typedef struct _GstMemory GstMemory;
39 typedef struct _GstAllocator GstAllocator;
41 #define GST_MEMORY_CAST(mem) ((GstMemory *)(mem))
45 * @GST_MEMORY_FLAG_READONLY: memory is readonly. It is not allowed to map the
46 * memory with #GST_MAP_WRITE.
47 * @GST_MEMORY_FLAG_NO_SHARE: memory must not be shared. Copies will have to be
48 * made when this memory needs to be shared between buffers.
49 * @GST_MEMORY_FLAG_ZERO_PREFIXED: the memory prefix is filled with 0 bytes
50 * @GST_MEMORY_FLAG_ZERO_PADDED: the memory padding is filled with 0 bytes
51 * @GST_MEMORY_FLAG_PHYSICALLY_CONTIGUOUS: the memory is physically contiguous. (Since 1.2)
52 * @GST_MEMORY_FLAG_NOT_MAPPABLE: the memory can't be mapped via gst_memory_map() without any preconditions. (Since 1.2)
53 * @GST_MEMORY_FLAG_LAST: first flag that can be used for custom purposes
55 * Flags for wrapped memory.
58 GST_MEMORY_FLAG_READONLY = GST_MINI_OBJECT_FLAG_LOCK_READONLY,
59 GST_MEMORY_FLAG_NO_SHARE = (GST_MINI_OBJECT_FLAG_LAST << 0),
60 GST_MEMORY_FLAG_ZERO_PREFIXED = (GST_MINI_OBJECT_FLAG_LAST << 1),
61 GST_MEMORY_FLAG_ZERO_PADDED = (GST_MINI_OBJECT_FLAG_LAST << 2),
62 GST_MEMORY_FLAG_PHYSICALLY_CONTIGUOUS = (GST_MINI_OBJECT_FLAG_LAST << 3),
63 GST_MEMORY_FLAG_NOT_MAPPABLE = (GST_MINI_OBJECT_FLAG_LAST << 4),
65 GST_MEMORY_FLAG_LAST = (GST_MINI_OBJECT_FLAG_LAST << 16)
72 * A flags word containing #GstMemoryFlags flags set on @mem
74 #define GST_MEMORY_FLAGS(mem) GST_MINI_OBJECT_FLAGS (mem)
76 * GST_MEMORY_FLAG_IS_SET:
78 * @flag: the #GstMemoryFlags to check.
80 * Gives the status of a specific flag on a @mem.
82 #define GST_MEMORY_FLAG_IS_SET(mem,flag) GST_MINI_OBJECT_FLAG_IS_SET (mem,flag)
84 * GST_MEMORY_FLAG_UNSET:
86 * @flag: the #GstMemoryFlags to clear.
88 * Clear a specific flag on a @mem.
90 #define GST_MEMORY_FLAG_UNSET(mem,flag) GST_MINI_OBJECT_FLAG_UNSET (mem, flag)
93 * GST_MEMORY_IS_READONLY:
96 * Check if @mem is readonly.
98 #define GST_MEMORY_IS_READONLY(mem) GST_MEMORY_FLAG_IS_SET(mem,GST_MEMORY_FLAG_READONLY)
100 * GST_MEMORY_IS_NO_SHARE:
101 * @mem: a #GstMemory.
103 * Check if @mem cannot be shared between buffers
105 #define GST_MEMORY_IS_NO_SHARE(mem) GST_MEMORY_FLAG_IS_SET(mem,GST_MEMORY_FLAG_NO_SHARE)
107 * GST_MEMORY_IS_ZERO_PREFIXED:
108 * @mem: a #GstMemory.
110 * Check if the prefix in @mem is 0 filled.
112 #define GST_MEMORY_IS_ZERO_PREFIXED(mem) GST_MEMORY_FLAG_IS_SET(mem,GST_MEMORY_FLAG_ZERO_PREFIXED)
114 * GST_MEMORY_IS_ZERO_PADDED:
115 * @mem: a #GstMemory.
117 * Check if the padding in @mem is 0 filled.
119 #define GST_MEMORY_IS_ZERO_PADDED(mem) GST_MEMORY_FLAG_IS_SET(mem,GST_MEMORY_FLAG_ZERO_PADDED)
122 * GST_MEMORY_IS_PHYSICALLY_CONTIGUOUS:
123 * @mem: a #GstMemory.
125 * Check if @mem is physically contiguous.
129 #define GST_MEMORY_IS_PHYSICALLY_CONTIGUOUS(mem) GST_MEMORY_FLAG_IS_SET(mem,GST_MEMORY_FLAG_PHYSICALLY_CONTIGUOUS)
132 * GST_MEMORY_IS_NOT_MAPPABLE:
133 * @mem: a #GstMemory.
135 * Check if @mem can't be mapped via gst_memory_map() without any preconditions
139 #define GST_MEMORY_IS_NOT_MAPPABLE(mem) GST_MEMORY_FLAG_IS_SET(mem,GST_MEMORY_FLAG_NOT_MAPPABLE)
143 * @mini_object: parent structure
144 * @allocator: pointer to the #GstAllocator
145 * @parent: parent memory block
146 * @maxsize: the maximum size allocated
147 * @align: the alignment of the memory
148 * @offset: the offset where valid data starts
149 * @size: the size of valid data
151 * Base structure for memory implementations. Custom memory will put this structure
152 * as the first member of their structure.
155 GstMiniObject mini_object;
157 GstAllocator *allocator;
168 * @GST_MAP_READ: map for read access
169 * @GST_MAP_WRITE: map for write access
170 * @GST_MAP_FLAG_LAST: first flag that can be used for custom purposes
172 * Flags used when mapping memory
175 GST_MAP_READ = GST_LOCK_FLAG_READ,
176 GST_MAP_WRITE = GST_LOCK_FLAG_WRITE,
178 GST_MAP_FLAG_LAST = (1 << 16)
184 * GstMapFlags value alias for GST_MAP_READ | GST_MAP_WRITE
186 #define GST_MAP_READWRITE (GST_MAP_READ | GST_MAP_WRITE)
191 * @memory: a pointer to the mapped memory
192 * @flags: flags used when mapping the memory
193 * @data: (array length=size): a pointer to the mapped data
194 * @size: the valid size in @data
195 * @maxsize: the maximum bytes in @data
196 * @user_data: extra private user_data that the implementation of the memory
197 * can use to store extra info.
199 * A structure containing the result of a map operation such as
200 * gst_memory_map(). It contains the data and size.
209 gpointer user_data[4];
212 gpointer _gst_reserved[GST_PADDING];
218 * Initializer for #GstMapInfo
220 #define GST_MAP_INFO_INIT { NULL, (GstMapFlags) 0, NULL, 0, 0, { NULL, NULL, NULL, NULL}, {NULL, NULL, NULL, NULL}}
223 * GstMemoryMapFunction:
225 * @maxsize: size to map
226 * @flags: access mode for the memory
228 * Get the memory of @mem that can be accessed according to the mode specified
229 * in @flags. The function should return a pointer that contains at least
232 * Returns: a pointer to memory of which at least @maxsize bytes can be
233 * accessed according to the access pattern in @flags.
235 typedef gpointer (*GstMemoryMapFunction) (GstMemory *mem, gsize maxsize, GstMapFlags flags);
238 * GstMemoryMapFullFunction:
240 * @info: the #GstMapInfo to map with
241 * @maxsize: size to map
243 * Get the memory of @mem that can be accessed according to the mode specified
244 * in @info's flags. The function should return a pointer that contains at least
247 * Returns: a pointer to memory of which at least @maxsize bytes can be
248 * accessed according to the access pattern in @info's flags.
250 typedef gpointer (*GstMemoryMapFullFunction) (GstMemory *mem, GstMapInfo * info, gsize maxsize);
253 * GstMemoryUnmapFunction:
256 * Return the pointer previously retrieved with gst_memory_map().
258 typedef void (*GstMemoryUnmapFunction) (GstMemory *mem);
261 * GstMemoryUnmapFullFunction:
263 * @info: a #GstMapInfo
265 * Return the pointer previously retrieved with gst_memory_map() with @info.
267 typedef void (*GstMemoryUnmapFullFunction) (GstMemory *mem, GstMapInfo * info);
270 * GstMemoryCopyFunction:
273 * @size: a size or -1
275 * Copy @size bytes from @mem starting at @offset and return them wrapped in a
276 * new GstMemory object.
277 * If @size is set to -1, all bytes starting at @offset are copied.
279 * Returns: a new #GstMemory object wrapping a copy of the requested region in
282 typedef GstMemory * (*GstMemoryCopyFunction) (GstMemory *mem, gssize offset, gssize size);
285 * GstMemoryShareFunction:
288 * @size: a size or -1
290 * Share @size bytes from @mem starting at @offset and return them wrapped in a
291 * new GstMemory object. If @size is set to -1, all bytes starting at @offset are
292 * shared. This function does not make a copy of the bytes in @mem.
294 * Returns: a new #GstMemory object sharing the requested region in @mem.
296 typedef GstMemory * (*GstMemoryShareFunction) (GstMemory *mem, gssize offset, gssize size);
299 * GstMemoryIsSpanFunction:
300 * @mem1: a #GstMemory
301 * @mem2: a #GstMemory
302 * @offset: a result offset
304 * Check if @mem1 and @mem2 occupy contiguous memory and return the offset of
305 * @mem1 in the parent buffer in @offset.
307 * Returns: %TRUE if @mem1 and @mem2 are in contiguous memory.
309 typedef gboolean (*GstMemoryIsSpanFunction) (GstMemory *mem1, GstMemory *mem2, gsize *offset);
311 void gst_memory_init (GstMemory *mem, GstMemoryFlags flags,
312 GstAllocator *allocator, GstMemory *parent,
313 gsize maxsize, gsize align,
314 gsize offset, gsize size);
316 gboolean gst_memory_is_type (GstMemory *mem, const gchar *mem_type);
321 * @memory: The memory to refcount
323 * Increase the refcount of this memory.
325 * Returns: (transfer full): @memory (for convenience when doing assignments)
327 static inline GstMemory *
328 gst_memory_ref (GstMemory * memory)
330 return (GstMemory *) gst_mini_object_ref (GST_MINI_OBJECT_CAST (memory));
335 * @memory: (transfer full): the memory to refcount
337 * Decrease the refcount of an memory, freeing it if the refcount reaches 0.
340 gst_memory_unref (GstMemory * memory)
342 gst_mini_object_unref (GST_MINI_OBJECT_CAST (memory));
345 /* getting/setting memory properties */
346 gsize gst_memory_get_sizes (GstMemory *mem, gsize *offset, gsize *maxsize);
347 void gst_memory_resize (GstMemory *mem, gssize offset, gsize size);
349 #define gst_memory_lock(m,f) gst_mini_object_lock (GST_MINI_OBJECT_CAST (m), (f))
350 #define gst_memory_unlock(m,f) gst_mini_object_unlock (GST_MINI_OBJECT_CAST (m), (f))
351 #define gst_memory_is_writable(m) gst_mini_object_is_writable (GST_MINI_OBJECT_CAST (m))
352 #define gst_memory_make_writable(m) GST_MEMORY_CAST (gst_mini_object_make_writable (GST_MINI_OBJECT_CAST (m)))
354 /* retrieving data */
355 GstMemory * gst_memory_make_mapped (GstMemory *mem, GstMapInfo *info, GstMapFlags flags) G_GNUC_WARN_UNUSED_RESULT;
356 gboolean gst_memory_map (GstMemory *mem, GstMapInfo *info, GstMapFlags flags);
357 void gst_memory_unmap (GstMemory *mem, GstMapInfo *info);
359 /* copy and subregions */
360 GstMemory * gst_memory_copy (GstMemory *mem, gssize offset, gssize size) G_GNUC_WARN_UNUSED_RESULT;
361 GstMemory * gst_memory_share (GstMemory *mem, gssize offset, gssize size) G_GNUC_WARN_UNUSED_RESULT;
364 gboolean gst_memory_is_span (GstMemory *mem1, GstMemory *mem2, gsize *offset);
366 #ifdef G_DEFINE_AUTOPTR_CLEANUP_FUNC
367 G_DEFINE_AUTOPTR_CLEANUP_FUNC(GstMemory, gst_memory_unref)
370 #ifdef G_DEFINE_AUTOPTR_CLEANUP_FUNC
371 G_DEFINE_AUTOPTR_CLEANUP_FUNC(GstAllocator, gst_object_unref)
376 #endif /* __GST_MEMORY_H__ */