2 * Copyright (C) 1999,2000 Erik Walthinsen <omega@cse.ogi.edu>
3 * 2000 Wim Taymans <wtay@chello.be>
5 * gstbuffer.h: Header for GstBuffer object
7 * This library is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Library General Public
9 * License as published by the Free Software Foundation; either
10 * version 2 of the License, or (at your option) any later version.
12 * This library is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Library General Public License for more details.
17 * You should have received a copy of the GNU Library General Public
18 * License along with this library; if not, write to the
19 * Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
20 * Boston, MA 02110-1301, USA.
24 #ifndef __GST_BUFFER_H__
25 #define __GST_BUFFER_H__
27 #include <gst/gstminiobject.h>
28 #include <gst/gstclock.h>
29 #include <gst/gstallocator.h>
33 GST_EXPORT GType _gst_buffer_type;
35 typedef struct _GstBuffer GstBuffer;
36 typedef struct _GstBufferPool GstBufferPool;
38 #define GST_TYPE_BUFFER (_gst_buffer_type)
39 #define GST_IS_BUFFER(obj) (GST_IS_MINI_OBJECT_TYPE(obj, GST_TYPE_BUFFER))
40 #define GST_BUFFER_CAST(obj) ((GstBuffer *)(obj))
41 #define GST_BUFFER(obj) (GST_BUFFER_CAST(obj))
47 * A flags word containing #GstBufferFlags flags set on this buffer.
49 #define GST_BUFFER_FLAGS(buf) GST_MINI_OBJECT_FLAGS(buf)
51 * GST_BUFFER_FLAG_IS_SET:
53 * @flag: the #GstBufferFlags flag to check.
55 * Gives the status of a specific flag on a buffer.
57 #define GST_BUFFER_FLAG_IS_SET(buf,flag) GST_MINI_OBJECT_FLAG_IS_SET (buf, flag)
59 * GST_BUFFER_FLAG_SET:
61 * @flag: the #GstBufferFlags flag to set.
63 * Sets a buffer flag on a buffer.
65 #define GST_BUFFER_FLAG_SET(buf,flag) GST_MINI_OBJECT_FLAG_SET (buf, flag)
67 * GST_BUFFER_FLAG_UNSET:
69 * @flag: the #GstBufferFlags flag to clear.
71 * Clears a buffer flag.
73 #define GST_BUFFER_FLAG_UNSET(buf,flag) GST_MINI_OBJECT_FLAG_UNSET (buf, flag)
78 * @buf: a #GstBuffer.:
80 * The presentation timestamp (pts) in nanoseconds (as a #GstClockTime)
81 * of the data in the buffer. This is the timestamp when the media should be
82 * presented to the user.
83 * Value will be %GST_CLOCK_TIME_NONE if the pts is unknown.
85 #define GST_BUFFER_PTS(buf) (GST_BUFFER_CAST(buf)->pts)
88 * @buf: a #GstBuffer.:
90 * The decoding timestamp (dts) in nanoseconds (as a #GstClockTime)
91 * of the data in the buffer. This is the timestamp when the media should be
92 * decoded or processed otherwise.
93 * Value will be %GST_CLOCK_TIME_NONE if the dts is unknown.
95 #define GST_BUFFER_DTS(buf) (GST_BUFFER_CAST(buf)->dts)
97 * GST_BUFFER_DURATION:
100 * The duration in nanoseconds (as a #GstClockTime) of the data in the buffer.
101 * Value will be %GST_CLOCK_TIME_NONE if the duration is unknown.
103 #define GST_BUFFER_DURATION(buf) (GST_BUFFER_CAST(buf)->duration)
106 * @buf: a #GstBuffer.
108 * The offset in the source file of the beginning of this buffer.
110 #define GST_BUFFER_OFFSET(buf) (GST_BUFFER_CAST(buf)->offset)
112 * GST_BUFFER_OFFSET_END:
113 * @buf: a #GstBuffer.
115 * The offset in the source file of the end of this buffer.
117 #define GST_BUFFER_OFFSET_END(buf) (GST_BUFFER_CAST(buf)->offset_end)
120 * GST_BUFFER_OFFSET_NONE:
122 * Constant for no-offset return results.
124 #define GST_BUFFER_OFFSET_NONE ((guint64)-1)
127 * GST_BUFFER_DURATION_IS_VALID:
128 * @buffer: a #GstBuffer
130 * Tests if the duration is known.
132 #define GST_BUFFER_DURATION_IS_VALID(buffer) (GST_CLOCK_TIME_IS_VALID (GST_BUFFER_DURATION (buffer)))
134 * GST_BUFFER_PTS_IS_VALID:
135 * @buffer: a #GstBuffer
137 * Tests if the pts is known.
139 #define GST_BUFFER_PTS_IS_VALID(buffer) (GST_CLOCK_TIME_IS_VALID (GST_BUFFER_PTS (buffer)))
141 * GST_BUFFER_DTS_IS_VALID:
142 * @buffer: a #GstBuffer
144 * Tests if the dts is known.
146 #define GST_BUFFER_DTS_IS_VALID(buffer) (GST_CLOCK_TIME_IS_VALID (GST_BUFFER_DTS (buffer)))
148 * GST_BUFFER_OFFSET_IS_VALID:
149 * @buffer: a #GstBuffer
151 * Tests if the start offset is known.
153 #define GST_BUFFER_OFFSET_IS_VALID(buffer) (GST_BUFFER_OFFSET (buffer) != GST_BUFFER_OFFSET_NONE)
155 * GST_BUFFER_OFFSET_END_IS_VALID:
156 * @buffer: a #GstBuffer
158 * Tests if the end offset is known.
160 #define GST_BUFFER_OFFSET_END_IS_VALID(buffer) (GST_BUFFER_OFFSET_END (buffer) != GST_BUFFER_OFFSET_NONE)
162 * GST_BUFFER_IS_DISCONT:
163 * @buffer: a #GstBuffer
165 * Tests if the buffer marks a discontinuity in the stream.
167 #define GST_BUFFER_IS_DISCONT(buffer) (GST_BUFFER_FLAG_IS_SET (buffer, GST_BUFFER_FLAG_DISCONT))
171 * @GST_BUFFER_FLAG_LIVE: the buffer is live data and should be discarded in
173 * @GST_BUFFER_FLAG_DECODE_ONLY: the buffer contains data that should be dropped
174 * because it will be clipped against the segment
175 * boundaries or because it does not contain data
176 * that should be shown to the user.
177 * @GST_BUFFER_FLAG_DISCONT: the buffer marks a data discontinuity in the stream.
178 * This typically occurs after a seek or a dropped buffer
179 * from a live or network source.
180 * @GST_BUFFER_FLAG_RESYNC: the buffer timestamps might have a discontinuity
181 * and this buffer is a good point to resynchronize.
182 * @GST_BUFFER_FLAG_CORRUPTED: the buffer data is corrupted.
183 * @GST_BUFFER_FLAG_MARKER: the buffer contains a media specific marker. for
184 * video this is typically the end of a frame boundary, for audio
185 * this is usually the start of a talkspurt.
186 * @GST_BUFFER_FLAG_HEADER: the buffer contains header information that is
187 * needed to decode the following data.
188 * @GST_BUFFER_FLAG_GAP: the buffer has been created to fill a gap in the
189 * stream and contains media neutral data (elements can
190 * switch to optimized code path that ignores the buffer
192 * @GST_BUFFER_FLAG_DROPPABLE: the buffer can be dropped without breaking the
193 * stream, for example to reduce bandwidth.
194 * @GST_BUFFER_FLAG_DELTA_UNIT: this unit cannot be decoded independently.
195 * @GST_BUFFER_FLAG_TAG_MEMORY: this flag is set when memory of the buffer
197 * @GST_BUFFER_FLAG_SYNC_AFTER: Elements which write to disk or permanent
198 * storage should ensure the data is synced after
199 * writing the contents of this buffer. (Since 1.6)
200 * @GST_BUFFER_FLAG_LAST: additional media specific flags can be added starting from
203 * A set of buffer flags used to describe properties of a #GstBuffer.
206 GST_BUFFER_FLAG_LIVE = (GST_MINI_OBJECT_FLAG_LAST << 0),
207 GST_BUFFER_FLAG_DECODE_ONLY = (GST_MINI_OBJECT_FLAG_LAST << 1),
208 GST_BUFFER_FLAG_DISCONT = (GST_MINI_OBJECT_FLAG_LAST << 2),
209 GST_BUFFER_FLAG_RESYNC = (GST_MINI_OBJECT_FLAG_LAST << 3),
210 GST_BUFFER_FLAG_CORRUPTED = (GST_MINI_OBJECT_FLAG_LAST << 4),
211 GST_BUFFER_FLAG_MARKER = (GST_MINI_OBJECT_FLAG_LAST << 5),
212 GST_BUFFER_FLAG_HEADER = (GST_MINI_OBJECT_FLAG_LAST << 6),
213 GST_BUFFER_FLAG_GAP = (GST_MINI_OBJECT_FLAG_LAST << 7),
214 GST_BUFFER_FLAG_DROPPABLE = (GST_MINI_OBJECT_FLAG_LAST << 8),
215 GST_BUFFER_FLAG_DELTA_UNIT = (GST_MINI_OBJECT_FLAG_LAST << 9),
216 GST_BUFFER_FLAG_TAG_MEMORY = (GST_MINI_OBJECT_FLAG_LAST << 10),
217 GST_BUFFER_FLAG_SYNC_AFTER = (GST_MINI_OBJECT_FLAG_LAST << 11),
219 GST_BUFFER_FLAG_LAST = (GST_MINI_OBJECT_FLAG_LAST << 16)
224 * @mini_object: the parent structure
225 * @pool: pointer to the pool owner of the buffer
226 * @pts: presentation timestamp of the buffer, can be #GST_CLOCK_TIME_NONE when the
227 * pts is not known or relevant. The pts contains the timestamp when the
228 * media should be presented to the user.
229 * @dts: decoding timestamp of the buffer, can be #GST_CLOCK_TIME_NONE when the
230 * dts is not known or relevant. The dts contains the timestamp when the
231 * media should be processed.
232 * @duration: duration in time of the buffer data, can be #GST_CLOCK_TIME_NONE
233 * when the duration is not known or relevant.
234 * @offset: a media specific offset for the buffer data.
235 * For video frames, this is the frame number of this buffer.
236 * For audio samples, this is the offset of the first sample in this buffer.
237 * For file data or compressed data this is the byte offset of the first
238 * byte in this buffer.
239 * @offset_end: the last offset contained in this buffer. It has the same
242 * The structure of a #GstBuffer. Use the associated macros to access the public
246 GstMiniObject mini_object;
248 /*< public >*/ /* with COW */
254 GstClockTime duration;
256 /* media specific offset */
261 GType gst_buffer_get_type (void);
263 guint gst_buffer_get_max_memory (void);
266 GstBuffer * gst_buffer_new (void);
267 GstBuffer * gst_buffer_new_allocate (GstAllocator * allocator, gsize size,
268 GstAllocationParams * params);
269 GstBuffer * gst_buffer_new_wrapped_full (GstMemoryFlags flags, gpointer data, gsize maxsize,
270 gsize offset, gsize size, gpointer user_data,
271 GDestroyNotify notify);
272 GstBuffer * gst_buffer_new_wrapped (gpointer data, gsize size);
275 guint gst_buffer_n_memory (GstBuffer *buffer);
276 void gst_buffer_insert_memory (GstBuffer *buffer, gint idx, GstMemory *mem);
277 void gst_buffer_replace_memory_range (GstBuffer *buffer, guint idx, gint length, GstMemory *mem);
278 GstMemory * gst_buffer_peek_memory (GstBuffer *buffer, guint idx);
279 GstMemory * gst_buffer_get_memory_range (GstBuffer *buffer, guint idx, gint length);
280 void gst_buffer_remove_memory_range (GstBuffer *buffer, guint idx, gint length);
282 void gst_buffer_prepend_memory (GstBuffer *buffer, GstMemory *mem);
283 void gst_buffer_append_memory (GstBuffer *buffer, GstMemory *mem);
284 void gst_buffer_replace_memory (GstBuffer *buffer, guint idx, GstMemory *mem);
285 void gst_buffer_replace_all_memory (GstBuffer *buffer, GstMemory *mem);
286 GstMemory * gst_buffer_get_memory (GstBuffer *buffer, guint idx);
287 GstMemory * gst_buffer_get_all_memory (GstBuffer *buffer);
288 void gst_buffer_remove_memory (GstBuffer *buffer, guint idx);
289 void gst_buffer_remove_all_memory (GstBuffer *buffer);
291 gboolean gst_buffer_find_memory (GstBuffer *buffer, gsize offset, gsize size,
292 guint *idx, guint *length, gsize *skip);
294 gboolean gst_buffer_is_memory_range_writable (GstBuffer *buffer, guint idx, gint length);
295 gboolean gst_buffer_is_all_memory_writable (GstBuffer *buffer);
297 gsize gst_buffer_fill (GstBuffer *buffer, gsize offset,
298 gconstpointer src, gsize size);
299 gsize gst_buffer_extract (GstBuffer *buffer, gsize offset,
300 gpointer dest, gsize size);
301 gint gst_buffer_memcmp (GstBuffer *buffer, gsize offset,
302 gconstpointer mem, gsize size);
303 gsize gst_buffer_memset (GstBuffer *buffer, gsize offset,
304 guint8 val, gsize size);
306 gsize gst_buffer_get_sizes_range (GstBuffer *buffer, guint idx, gint length,
307 gsize *offset, gsize *maxsize);
308 gboolean gst_buffer_resize_range (GstBuffer *buffer, guint idx, gint length,
309 gssize offset, gssize size);
311 gsize gst_buffer_get_sizes (GstBuffer *buffer, gsize *offset, gsize *maxsize);
312 gsize gst_buffer_get_size (GstBuffer *buffer);
313 void gst_buffer_resize (GstBuffer *buffer, gssize offset, gssize size);
314 void gst_buffer_set_size (GstBuffer *buffer, gssize size);
316 gboolean gst_buffer_map_range (GstBuffer *buffer, guint idx, gint length,
317 GstMapInfo *info, GstMapFlags flags);
318 gboolean gst_buffer_map (GstBuffer *buffer, GstMapInfo *info, GstMapFlags flags);
320 void gst_buffer_unmap (GstBuffer *buffer, GstMapInfo *info);
321 void gst_buffer_extract_dup (GstBuffer *buffer, gsize offset,
322 gsize size, gpointer *dest,
328 * @buf: a #GstBuffer.
330 * Increases the refcount of the given buffer by one.
332 * Note that the refcount affects the writability
333 * of @buf and its metadata, see gst_buffer_is_writable().
334 * It is important to note that keeping additional references to
335 * GstBuffer instances can potentially increase the number
336 * of memcpy operations in a pipeline.
338 * Returns: (transfer full): @buf
340 #ifdef _FOOL_GTK_DOC_
341 G_INLINE_FUNC GstBuffer * gst_buffer_ref (GstBuffer * buf);
344 static inline GstBuffer *
345 gst_buffer_ref (GstBuffer * buf)
347 return (GstBuffer *) gst_mini_object_ref (GST_MINI_OBJECT_CAST (buf));
352 * @buf: (transfer full): a #GstBuffer.
354 * Decreases the refcount of the buffer. If the refcount reaches 0, the buffer
355 * with the associated metadata and memory will be freed.
357 #ifdef _FOOL_GTK_DOC_
358 G_INLINE_FUNC void gst_buffer_unref (GstBuffer * buf);
362 gst_buffer_unref (GstBuffer * buf)
364 gst_mini_object_unref (GST_MINI_OBJECT_CAST (buf));
370 * @buf: a #GstBuffer.
372 * Create a copy of the given buffer. This will only copy the buffer's
373 * data to a newly allocated memory if needed (if the type of memory
374 * requires it), otherwise the underlying data is just referenced.
375 * Check gst_buffer_copy_deep() if you want to force the data
376 * to be copied to newly allocated memory.
378 * Returns: (transfer full): a new copy of @buf.
380 #ifdef _FOOL_GTK_DOC_
381 G_INLINE_FUNC GstBuffer * gst_buffer_copy (const GstBuffer * buf);
384 static inline GstBuffer *
385 gst_buffer_copy (const GstBuffer * buf)
387 return GST_BUFFER (gst_mini_object_copy (GST_MINI_OBJECT_CONST_CAST (buf)));
390 GstBuffer * gst_buffer_copy_deep (const GstBuffer * buf);
393 * GstBufferCopyFlags:
394 * @GST_BUFFER_COPY_NONE: copy nothing
395 * @GST_BUFFER_COPY_FLAGS: flag indicating that buffer flags should be copied
396 * @GST_BUFFER_COPY_TIMESTAMPS: flag indicating that buffer pts, dts,
397 * duration, offset and offset_end should be copied
398 * @GST_BUFFER_COPY_MEMORY: flag indicating that buffer memory should be reffed
399 * and appended to already existing memory. Unless the memory is marked as
400 * NO_SHARE, no actual copy of the memory is made but it is simply reffed.
401 * Add @GST_BUFFER_COPY_DEEP to force a real copy.
402 * @GST_BUFFER_COPY_MERGE: flag indicating that buffer memory should be
404 * @GST_BUFFER_COPY_META: flag indicating that buffer meta should be
406 * @GST_BUFFER_COPY_DEEP: flag indicating that memory should always be
407 * copied instead of reffed (Since 1.2)
409 * A set of flags that can be provided to the gst_buffer_copy_into()
410 * function to specify which items should be copied.
413 GST_BUFFER_COPY_NONE = 0,
414 GST_BUFFER_COPY_FLAGS = (1 << 0),
415 GST_BUFFER_COPY_TIMESTAMPS = (1 << 1),
416 GST_BUFFER_COPY_META = (1 << 2),
417 GST_BUFFER_COPY_MEMORY = (1 << 3),
418 GST_BUFFER_COPY_MERGE = (1 << 4),
419 GST_BUFFER_COPY_DEEP = (1 << 5)
420 } GstBufferCopyFlags;
423 * GST_BUFFER_COPY_METADATA:
425 * Combination of all possible metadata fields that can be copied with
426 * gst_buffer_copy_into().
428 #define GST_BUFFER_COPY_METADATA (GST_BUFFER_COPY_FLAGS | GST_BUFFER_COPY_TIMESTAMPS |\
429 GST_BUFFER_COPY_META)
432 * GST_BUFFER_COPY_ALL:
434 * Combination of all possible fields that can be copied with
435 * gst_buffer_copy_into().
437 #define GST_BUFFER_COPY_ALL ((GstBufferCopyFlags)(GST_BUFFER_COPY_METADATA | GST_BUFFER_COPY_MEMORY))
439 /* copies memory or metadata into newly allocated buffer */
440 gboolean gst_buffer_copy_into (GstBuffer *dest, GstBuffer *src,
441 GstBufferCopyFlags flags,
442 gsize offset, gsize size);
445 * gst_buffer_is_writable:
448 * Tests if you can safely write to a buffer's metadata or its memory array.
449 * It is only safe to change buffer metadata when the current reference is
450 * writable, i.e. nobody can see the modifications you will make.
452 #define gst_buffer_is_writable(buf) gst_mini_object_is_writable (GST_MINI_OBJECT_CAST (buf))
454 * gst_buffer_make_writable:
455 * @buf: (transfer full): a #GstBuffer
457 * Makes a writable buffer from the given buffer. If the source buffer is
458 * already writable, this will simply return the same buffer. A copy will
459 * otherwise be made using gst_buffer_copy().
461 * Returns: (transfer full): a writable buffer which may or may not be the
464 #define gst_buffer_make_writable(buf) GST_BUFFER_CAST (gst_mini_object_make_writable (GST_MINI_OBJECT_CAST (buf)))
467 * gst_buffer_replace:
468 * @obuf: (inout) (transfer full) (nullable): pointer to a pointer to
469 * a #GstBuffer to be replaced.
470 * @nbuf: (transfer none) (allow-none): pointer to a #GstBuffer that will
471 * replace the buffer pointed to by @obuf.
473 * Modifies a pointer to a #GstBuffer to point to a different #GstBuffer. The
474 * modification is done atomically (so this is useful for ensuring thread safety
475 * in some cases), and the reference counts are updated appropriately (the old
476 * buffer is unreffed, the new is reffed).
478 * Either @nbuf or the #GstBuffer pointed to by @obuf may be %NULL.
480 * Returns: %TRUE when @obuf was different from @nbuf.
482 #ifdef _FOOL_GTK_DOC_
483 G_INLINE_FUNC gboolean gst_buffer_replace (GstBuffer **obuf, GstBuffer *nbuf);
486 static inline gboolean
487 gst_buffer_replace (GstBuffer **obuf, GstBuffer *nbuf)
489 return gst_mini_object_replace ((GstMiniObject **) obuf, (GstMiniObject *) nbuf);
492 /* creating a region */
493 GstBuffer* gst_buffer_copy_region (GstBuffer *parent, GstBufferCopyFlags flags,
494 gsize offset, gsize size);
496 /* append two buffers */
497 GstBuffer* gst_buffer_append_region (GstBuffer *buf1, GstBuffer *buf2,
498 gssize offset, gssize size);
499 GstBuffer* gst_buffer_append (GstBuffer *buf1, GstBuffer *buf2);
502 #include <gst/gstmeta.h>
505 * GstBufferForeachMetaFunc:
506 * @buffer: a #GstBuffer
507 * @meta: (out) (nullable): a pointer to a #GstMeta
508 * @user_data: user data passed to gst_buffer_foreach_meta()
510 * A function that will be called from gst_buffer_foreach_meta(). The @meta
511 * field will point to a the reference of the meta.
513 * @buffer should not be modified from this callback.
515 * When this function returns %TRUE, the next meta will be
516 * returned. When %FALSE is returned, gst_buffer_foreach_meta() will return.
518 * When @meta is set to %NULL, the item will be removed from the buffer.
520 * Returns: %FALSE when gst_buffer_foreach_meta() should stop
522 typedef gboolean (*GstBufferForeachMetaFunc) (GstBuffer *buffer, GstMeta **meta,
525 GstMeta * gst_buffer_get_meta (GstBuffer *buffer, GType api);
526 GstMeta * gst_buffer_add_meta (GstBuffer *buffer, const GstMetaInfo *info,
528 gboolean gst_buffer_remove_meta (GstBuffer *buffer, GstMeta *meta);
530 GstMeta * gst_buffer_iterate_meta (GstBuffer *buffer, gpointer *state);
532 gboolean gst_buffer_foreach_meta (GstBuffer *buffer,
533 GstBufferForeachMetaFunc func,
537 * gst_value_set_buffer:
538 * @v: a #GValue to receive the data
539 * @b: (transfer none): a #GstBuffer to assign to the GstValue
541 * Sets @b as the value of @v. Caller retains reference to buffer.
543 #define gst_value_set_buffer(v,b) g_value_set_boxed((v),(b))
545 * gst_value_take_buffer:
546 * @v: a #GValue to receive the data
547 * @b: (transfer full): a #GstBuffer to assign to the GstValue
549 * Sets @b as the value of @v. Caller gives away reference to buffer.
551 #define gst_value_take_buffer(v,b) g_value_take_boxed(v,(b))
553 * gst_value_get_buffer:
554 * @v: a #GValue to query
556 * Receives a #GstBuffer as the value of @v. Does not return a reference to
557 * the buffer, so the pointer is only valid for as long as the caller owns
560 * Returns: (transfer none): buffer
562 #define gst_value_get_buffer(v) GST_BUFFER_CAST (g_value_get_boxed(v))
564 typedef struct _GstParentBufferMeta GstParentBufferMeta;
567 * GstParentBufferMeta:
568 * @parent: the parent #GstMeta structure
569 * @buffer: the #GstBuffer on which a reference is being held.
571 * The #GstParentBufferMeta is a #GstMeta which can be attached to a #GstBuffer
572 * to hold a reference to another buffer that is only released when the child
573 * #GstBuffer is released.
575 * Typically, #GstParentBufferMeta is used when the child buffer is directly
576 * using the #GstMemory of the parent buffer, and wants to prevent the parent
577 * buffer from being returned to a buffer pool until the #GstMemory is available
582 struct _GstParentBufferMeta
590 GType gst_parent_buffer_meta_api_get_type (void);
591 #define GST_TYPE_PARENT_BUFFER_META_API_TYPE (gst_parent_buffer_meta_api_get_type())
594 * gst_buffer_get_parent_buffer_meta:
597 * Find and return a #GstParentBufferMeta if one exists on the
600 #define gst_buffer_get_parent_buffer_meta(b) \
601 ((GstParentBufferMeta*)gst_buffer_get_meta((b),GST_PARENT_BUFFER_META_API_TYPE))
603 const GstMetaInfo *gst_parent_buffer_meta_get_info (void);
604 #define GST_PARENT_BUFFER_META_INFO (gst_parent_buffer_meta_get_info())
607 GstParentBufferMeta *gst_buffer_add_parent_buffer_meta (GstBuffer *buffer,
612 #endif /* __GST_BUFFER_H__ */