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_DTS_OR_PTS:
98 * @buf: a #GstBuffer.:
100 * Returns the buffer decoding timestamp (dts) if valid, else the buffer
101 * presentation time (pts)
103 #define GST_BUFFER_DTS_OR_PTS(buf) (GST_BUFFER_DTS_IS_VALID(buf) ? GST_BUFFER_DTS(buf) : GST_BUFFER_PTS (buf))
105 * GST_BUFFER_DURATION:
106 * @buf: a #GstBuffer.
108 * The duration in nanoseconds (as a #GstClockTime) of the data in the buffer.
109 * Value will be %GST_CLOCK_TIME_NONE if the duration is unknown.
111 #define GST_BUFFER_DURATION(buf) (GST_BUFFER_CAST(buf)->duration)
114 * @buf: a #GstBuffer.
116 * The offset in the source file of the beginning of this buffer.
118 #define GST_BUFFER_OFFSET(buf) (GST_BUFFER_CAST(buf)->offset)
120 * GST_BUFFER_OFFSET_END:
121 * @buf: a #GstBuffer.
123 * The offset in the source file of the end of this buffer.
125 #define GST_BUFFER_OFFSET_END(buf) (GST_BUFFER_CAST(buf)->offset_end)
128 * GST_BUFFER_OFFSET_NONE:
130 * Constant for no-offset return results.
132 #define GST_BUFFER_OFFSET_NONE ((guint64)-1)
135 * GST_BUFFER_DURATION_IS_VALID:
136 * @buffer: a #GstBuffer
138 * Tests if the duration is known.
140 #define GST_BUFFER_DURATION_IS_VALID(buffer) (GST_CLOCK_TIME_IS_VALID (GST_BUFFER_DURATION (buffer)))
142 * GST_BUFFER_PTS_IS_VALID:
143 * @buffer: a #GstBuffer
145 * Tests if the pts is known.
147 #define GST_BUFFER_PTS_IS_VALID(buffer) (GST_CLOCK_TIME_IS_VALID (GST_BUFFER_PTS (buffer)))
149 * GST_BUFFER_DTS_IS_VALID:
150 * @buffer: a #GstBuffer
152 * Tests if the dts is known.
154 #define GST_BUFFER_DTS_IS_VALID(buffer) (GST_CLOCK_TIME_IS_VALID (GST_BUFFER_DTS (buffer)))
156 * GST_BUFFER_OFFSET_IS_VALID:
157 * @buffer: a #GstBuffer
159 * Tests if the start offset is known.
161 #define GST_BUFFER_OFFSET_IS_VALID(buffer) (GST_BUFFER_OFFSET (buffer) != GST_BUFFER_OFFSET_NONE)
163 * GST_BUFFER_OFFSET_END_IS_VALID:
164 * @buffer: a #GstBuffer
166 * Tests if the end offset is known.
168 #define GST_BUFFER_OFFSET_END_IS_VALID(buffer) (GST_BUFFER_OFFSET_END (buffer) != GST_BUFFER_OFFSET_NONE)
170 * GST_BUFFER_IS_DISCONT:
171 * @buffer: a #GstBuffer
173 * Tests if the buffer marks a discontinuity in the stream.
175 #define GST_BUFFER_IS_DISCONT(buffer) (GST_BUFFER_FLAG_IS_SET (buffer, GST_BUFFER_FLAG_DISCONT))
179 * @GST_BUFFER_FLAG_LIVE: the buffer is live data and should be discarded in
181 * @GST_BUFFER_FLAG_DECODE_ONLY: the buffer contains data that should be dropped
182 * because it will be clipped against the segment
183 * boundaries or because it does not contain data
184 * that should be shown to the user.
185 * @GST_BUFFER_FLAG_DISCONT: the buffer marks a data discontinuity in the stream.
186 * This typically occurs after a seek or a dropped buffer
187 * from a live or network source.
188 * @GST_BUFFER_FLAG_RESYNC: the buffer timestamps might have a discontinuity
189 * and this buffer is a good point to resynchronize.
190 * @GST_BUFFER_FLAG_CORRUPTED: the buffer data is corrupted.
191 * @GST_BUFFER_FLAG_MARKER: the buffer contains a media specific marker. for
192 * video this is typically the end of a frame boundary, for audio
193 * this is usually the start of a talkspurt.
194 * @GST_BUFFER_FLAG_HEADER: the buffer contains header information that is
195 * needed to decode the following data.
196 * @GST_BUFFER_FLAG_GAP: the buffer has been created to fill a gap in the
197 * stream and contains media neutral data (elements can
198 * switch to optimized code path that ignores the buffer
200 * @GST_BUFFER_FLAG_DROPPABLE: the buffer can be dropped without breaking the
201 * stream, for example to reduce bandwidth.
202 * @GST_BUFFER_FLAG_DELTA_UNIT: this unit cannot be decoded independently.
203 * @GST_BUFFER_FLAG_TAG_MEMORY: this flag is set when memory of the buffer
205 * @GST_BUFFER_FLAG_SYNC_AFTER: Elements which write to disk or permanent
206 * storage should ensure the data is synced after
207 * writing the contents of this buffer. (Since 1.6)
208 * @GST_BUFFER_FLAG_LAST: additional media specific flags can be added starting from
211 * A set of buffer flags used to describe properties of a #GstBuffer.
214 GST_BUFFER_FLAG_LIVE = (GST_MINI_OBJECT_FLAG_LAST << 0),
215 GST_BUFFER_FLAG_DECODE_ONLY = (GST_MINI_OBJECT_FLAG_LAST << 1),
216 GST_BUFFER_FLAG_DISCONT = (GST_MINI_OBJECT_FLAG_LAST << 2),
217 GST_BUFFER_FLAG_RESYNC = (GST_MINI_OBJECT_FLAG_LAST << 3),
218 GST_BUFFER_FLAG_CORRUPTED = (GST_MINI_OBJECT_FLAG_LAST << 4),
219 GST_BUFFER_FLAG_MARKER = (GST_MINI_OBJECT_FLAG_LAST << 5),
220 GST_BUFFER_FLAG_HEADER = (GST_MINI_OBJECT_FLAG_LAST << 6),
221 GST_BUFFER_FLAG_GAP = (GST_MINI_OBJECT_FLAG_LAST << 7),
222 GST_BUFFER_FLAG_DROPPABLE = (GST_MINI_OBJECT_FLAG_LAST << 8),
223 GST_BUFFER_FLAG_DELTA_UNIT = (GST_MINI_OBJECT_FLAG_LAST << 9),
224 GST_BUFFER_FLAG_TAG_MEMORY = (GST_MINI_OBJECT_FLAG_LAST << 10),
225 GST_BUFFER_FLAG_SYNC_AFTER = (GST_MINI_OBJECT_FLAG_LAST << 11),
227 GST_BUFFER_FLAG_LAST = (GST_MINI_OBJECT_FLAG_LAST << 16)
232 * @mini_object: the parent structure
233 * @pool: pointer to the pool owner of the buffer
234 * @pts: presentation timestamp of the buffer, can be #GST_CLOCK_TIME_NONE when the
235 * pts is not known or relevant. The pts contains the timestamp when the
236 * media should be presented to the user.
237 * @dts: decoding timestamp of the buffer, can be #GST_CLOCK_TIME_NONE when the
238 * dts is not known or relevant. The dts contains the timestamp when the
239 * media should be processed.
240 * @duration: duration in time of the buffer data, can be #GST_CLOCK_TIME_NONE
241 * when the duration is not known or relevant.
242 * @offset: a media specific offset for the buffer data.
243 * For video frames, this is the frame number of this buffer.
244 * For audio samples, this is the offset of the first sample in this buffer.
245 * For file data or compressed data this is the byte offset of the first
246 * byte in this buffer.
247 * @offset_end: the last offset contained in this buffer. It has the same
250 * The structure of a #GstBuffer. Use the associated macros to access the public
254 GstMiniObject mini_object;
256 /*< public >*/ /* with COW */
262 GstClockTime duration;
264 /* media specific offset */
269 GType gst_buffer_get_type (void);
271 guint gst_buffer_get_max_memory (void);
274 GstBuffer * gst_buffer_new (void);
275 GstBuffer * gst_buffer_new_allocate (GstAllocator * allocator, gsize size,
276 GstAllocationParams * params);
277 GstBuffer * gst_buffer_new_wrapped_full (GstMemoryFlags flags, gpointer data, gsize maxsize,
278 gsize offset, gsize size, gpointer user_data,
279 GDestroyNotify notify);
280 GstBuffer * gst_buffer_new_wrapped (gpointer data, gsize size);
283 guint gst_buffer_n_memory (GstBuffer *buffer);
284 void gst_buffer_insert_memory (GstBuffer *buffer, gint idx, GstMemory *mem);
285 void gst_buffer_replace_memory_range (GstBuffer *buffer, guint idx, gint length, GstMemory *mem);
286 GstMemory * gst_buffer_peek_memory (GstBuffer *buffer, guint idx);
287 GstMemory * gst_buffer_get_memory_range (GstBuffer *buffer, guint idx, gint length);
288 void gst_buffer_remove_memory_range (GstBuffer *buffer, guint idx, gint length);
290 void gst_buffer_prepend_memory (GstBuffer *buffer, GstMemory *mem);
291 void gst_buffer_append_memory (GstBuffer *buffer, GstMemory *mem);
292 void gst_buffer_replace_memory (GstBuffer *buffer, guint idx, GstMemory *mem);
293 void gst_buffer_replace_all_memory (GstBuffer *buffer, GstMemory *mem);
294 GstMemory * gst_buffer_get_memory (GstBuffer *buffer, guint idx);
295 GstMemory * gst_buffer_get_all_memory (GstBuffer *buffer);
296 void gst_buffer_remove_memory (GstBuffer *buffer, guint idx);
297 void gst_buffer_remove_all_memory (GstBuffer *buffer);
299 gboolean gst_buffer_find_memory (GstBuffer *buffer, gsize offset, gsize size,
300 guint *idx, guint *length, gsize *skip);
302 gboolean gst_buffer_is_memory_range_writable (GstBuffer *buffer, guint idx, gint length);
303 gboolean gst_buffer_is_all_memory_writable (GstBuffer *buffer);
305 gsize gst_buffer_fill (GstBuffer *buffer, gsize offset,
306 gconstpointer src, gsize size);
307 gsize gst_buffer_extract (GstBuffer *buffer, gsize offset,
308 gpointer dest, gsize size);
309 gint gst_buffer_memcmp (GstBuffer *buffer, gsize offset,
310 gconstpointer mem, gsize size);
311 gsize gst_buffer_memset (GstBuffer *buffer, gsize offset,
312 guint8 val, gsize size);
314 gsize gst_buffer_get_sizes_range (GstBuffer *buffer, guint idx, gint length,
315 gsize *offset, gsize *maxsize);
316 gboolean gst_buffer_resize_range (GstBuffer *buffer, guint idx, gint length,
317 gssize offset, gssize size);
319 gsize gst_buffer_get_sizes (GstBuffer *buffer, gsize *offset, gsize *maxsize);
320 gsize gst_buffer_get_size (GstBuffer *buffer);
321 void gst_buffer_resize (GstBuffer *buffer, gssize offset, gssize size);
322 void gst_buffer_set_size (GstBuffer *buffer, gssize size);
324 gboolean gst_buffer_map_range (GstBuffer *buffer, guint idx, gint length,
325 GstMapInfo *info, GstMapFlags flags);
326 gboolean gst_buffer_map (GstBuffer *buffer, GstMapInfo *info, GstMapFlags flags);
328 void gst_buffer_unmap (GstBuffer *buffer, GstMapInfo *info);
329 void gst_buffer_extract_dup (GstBuffer *buffer, gsize offset,
330 gsize size, gpointer *dest,
336 * @buf: a #GstBuffer.
338 * Increases the refcount of the given buffer by one.
340 * Note that the refcount affects the writability
341 * of @buf and its metadata, see gst_buffer_is_writable().
342 * It is important to note that keeping additional references to
343 * GstBuffer instances can potentially increase the number
344 * of memcpy operations in a pipeline.
346 * Returns: (transfer full): @buf
348 static inline GstBuffer *
349 gst_buffer_ref (GstBuffer * buf)
351 return (GstBuffer *) gst_mini_object_ref (GST_MINI_OBJECT_CAST (buf));
356 * @buf: (transfer full): a #GstBuffer.
358 * Decreases the refcount of the buffer. If the refcount reaches 0, the buffer
359 * with the associated metadata and memory will be freed.
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 static inline GstBuffer *
381 gst_buffer_copy (const GstBuffer * buf)
383 return GST_BUFFER (gst_mini_object_copy (GST_MINI_OBJECT_CONST_CAST (buf)));
386 GstBuffer * gst_buffer_copy_deep (const GstBuffer * buf);
389 * GstBufferCopyFlags:
390 * @GST_BUFFER_COPY_NONE: copy nothing
391 * @GST_BUFFER_COPY_FLAGS: flag indicating that buffer flags should be copied
392 * @GST_BUFFER_COPY_TIMESTAMPS: flag indicating that buffer pts, dts,
393 * duration, offset and offset_end should be copied
394 * @GST_BUFFER_COPY_MEMORY: flag indicating that buffer memory should be reffed
395 * and appended to already existing memory. Unless the memory is marked as
396 * NO_SHARE, no actual copy of the memory is made but it is simply reffed.
397 * Add @GST_BUFFER_COPY_DEEP to force a real copy.
398 * @GST_BUFFER_COPY_MERGE: flag indicating that buffer memory should be
400 * @GST_BUFFER_COPY_META: flag indicating that buffer meta should be
402 * @GST_BUFFER_COPY_DEEP: flag indicating that memory should always be
403 * copied instead of reffed (Since 1.2)
405 * A set of flags that can be provided to the gst_buffer_copy_into()
406 * function to specify which items should be copied.
409 GST_BUFFER_COPY_NONE = 0,
410 GST_BUFFER_COPY_FLAGS = (1 << 0),
411 GST_BUFFER_COPY_TIMESTAMPS = (1 << 1),
412 GST_BUFFER_COPY_META = (1 << 2),
413 GST_BUFFER_COPY_MEMORY = (1 << 3),
414 GST_BUFFER_COPY_MERGE = (1 << 4),
415 GST_BUFFER_COPY_DEEP = (1 << 5)
416 } GstBufferCopyFlags;
419 * GST_BUFFER_COPY_METADATA:
421 * Combination of all possible metadata fields that can be copied with
422 * gst_buffer_copy_into().
424 #define GST_BUFFER_COPY_METADATA (GST_BUFFER_COPY_FLAGS | GST_BUFFER_COPY_TIMESTAMPS |\
425 GST_BUFFER_COPY_META)
428 * GST_BUFFER_COPY_ALL:
430 * Combination of all possible fields that can be copied with
431 * gst_buffer_copy_into().
433 #define GST_BUFFER_COPY_ALL ((GstBufferCopyFlags)(GST_BUFFER_COPY_METADATA | GST_BUFFER_COPY_MEMORY))
435 /* copies memory or metadata into newly allocated buffer */
436 gboolean gst_buffer_copy_into (GstBuffer *dest, GstBuffer *src,
437 GstBufferCopyFlags flags,
438 gsize offset, gsize size);
441 * gst_buffer_is_writable:
444 * Tests if you can safely write to a buffer's metadata or its memory array.
445 * It is only safe to change buffer metadata when the current reference is
446 * writable, i.e. nobody can see the modifications you will make.
448 #define gst_buffer_is_writable(buf) gst_mini_object_is_writable (GST_MINI_OBJECT_CAST (buf))
450 * gst_buffer_make_writable:
451 * @buf: (transfer full): a #GstBuffer
453 * Returns a writable copy of @buf. If the source buffer is
454 * already writable, this will simply return the same buffer.
456 * Use this function to ensure that a buffer can be safely modified before
457 * making changes to it, including changing the metadata such as PTS/DTS.
459 * If the reference count of the source buffer @buf is exactly one, the caller
460 * is the sole owner and this function will return the buffer object unchanged.
462 * If there is more than one reference on the object, a copy will be made using
463 * gst_buffer_copy(). The passed-in @buf will be unreffed in that case, and the
464 * caller will now own a reference to the new returned buffer object. Note
465 * that this just copies the buffer structure itself, the underlying memory is
466 * not copied if it can be shared amongst multiple buffers.
468 * In short, this function unrefs the buf in the argument and refs the buffer
469 * that it returns. Don't access the argument after calling this function unless
470 * you have an additional reference to it.
472 * Returns: (transfer full): a writable buffer which may or may not be the
475 #define gst_buffer_make_writable(buf) GST_BUFFER_CAST (gst_mini_object_make_writable (GST_MINI_OBJECT_CAST (buf)))
478 * gst_buffer_replace:
479 * @obuf: (inout) (transfer full) (nullable): pointer to a pointer to
480 * a #GstBuffer to be replaced.
481 * @nbuf: (transfer none) (allow-none): pointer to a #GstBuffer that will
482 * replace the buffer pointed to by @obuf.
484 * Modifies a pointer to a #GstBuffer to point to a different #GstBuffer. The
485 * modification is done atomically (so this is useful for ensuring thread safety
486 * in some cases), and the reference counts are updated appropriately (the old
487 * buffer is unreffed, the new is reffed).
489 * Either @nbuf or the #GstBuffer pointed to by @obuf may be %NULL.
491 * Returns: %TRUE when @obuf was different from @nbuf.
493 static inline gboolean
494 gst_buffer_replace (GstBuffer **obuf, GstBuffer *nbuf)
496 return gst_mini_object_replace ((GstMiniObject **) obuf, (GstMiniObject *) nbuf);
499 /* creating a region */
500 GstBuffer* gst_buffer_copy_region (GstBuffer *parent, GstBufferCopyFlags flags,
501 gsize offset, gsize size);
503 /* append two buffers */
504 GstBuffer* gst_buffer_append_region (GstBuffer *buf1, GstBuffer *buf2,
505 gssize offset, gssize size);
506 GstBuffer* gst_buffer_append (GstBuffer *buf1, GstBuffer *buf2);
509 #include <gst/gstmeta.h>
512 * GstBufferForeachMetaFunc:
513 * @buffer: a #GstBuffer
514 * @meta: (out) (nullable): a pointer to a #GstMeta
515 * @user_data: user data passed to gst_buffer_foreach_meta()
517 * A function that will be called from gst_buffer_foreach_meta(). The @meta
518 * field will point to a the reference of the meta.
520 * @buffer should not be modified from this callback.
522 * When this function returns %TRUE, the next meta will be
523 * returned. When %FALSE is returned, gst_buffer_foreach_meta() will return.
525 * When @meta is set to %NULL, the item will be removed from the buffer.
527 * Returns: %FALSE when gst_buffer_foreach_meta() should stop
529 typedef gboolean (*GstBufferForeachMetaFunc) (GstBuffer *buffer, GstMeta **meta,
532 GstMeta * gst_buffer_get_meta (GstBuffer *buffer, GType api);
533 GstMeta * gst_buffer_add_meta (GstBuffer *buffer, const GstMetaInfo *info,
535 gboolean gst_buffer_remove_meta (GstBuffer *buffer, GstMeta *meta);
537 GstMeta * gst_buffer_iterate_meta (GstBuffer *buffer, gpointer *state);
539 gboolean gst_buffer_foreach_meta (GstBuffer *buffer,
540 GstBufferForeachMetaFunc func,
544 * gst_value_set_buffer:
545 * @v: a #GValue to receive the data
546 * @b: (transfer none): a #GstBuffer to assign to the GstValue
548 * Sets @b as the value of @v. Caller retains reference to buffer.
550 #define gst_value_set_buffer(v,b) g_value_set_boxed((v),(b))
552 * gst_value_take_buffer:
553 * @v: a #GValue to receive the data
554 * @b: (transfer full): a #GstBuffer to assign to the GstValue
556 * Sets @b as the value of @v. Caller gives away reference to buffer.
558 #define gst_value_take_buffer(v,b) g_value_take_boxed(v,(b))
560 * gst_value_get_buffer:
561 * @v: a #GValue to query
563 * Receives a #GstBuffer as the value of @v. Does not return a reference to
564 * the buffer, so the pointer is only valid for as long as the caller owns
567 * Returns: (transfer none): buffer
569 #define gst_value_get_buffer(v) GST_BUFFER_CAST (g_value_get_boxed(v))
571 typedef struct _GstParentBufferMeta GstParentBufferMeta;
574 * GstParentBufferMeta:
575 * @parent: the parent #GstMeta structure
576 * @buffer: the #GstBuffer on which a reference is being held.
578 * The #GstParentBufferMeta is a #GstMeta which can be attached to a #GstBuffer
579 * to hold a reference to another buffer that is only released when the child
580 * #GstBuffer is released.
582 * Typically, #GstParentBufferMeta is used when the child buffer is directly
583 * using the #GstMemory of the parent buffer, and wants to prevent the parent
584 * buffer from being returned to a buffer pool until the #GstMemory is available
589 struct _GstParentBufferMeta
597 GType gst_parent_buffer_meta_api_get_type (void);
598 #define GST_TYPE_PARENT_BUFFER_META_API_TYPE (gst_parent_buffer_meta_api_get_type())
601 * gst_buffer_get_parent_buffer_meta:
604 * Find and return a #GstParentBufferMeta if one exists on the
607 #define gst_buffer_get_parent_buffer_meta(b) \
608 ((GstParentBufferMeta*)gst_buffer_get_meta((b),GST_PARENT_BUFFER_META_API_TYPE))
610 const GstMetaInfo *gst_parent_buffer_meta_get_info (void);
611 #define GST_PARENT_BUFFER_META_INFO (gst_parent_buffer_meta_get_info())
614 GstParentBufferMeta *gst_buffer_add_parent_buffer_meta (GstBuffer *buffer,
617 #ifdef G_DEFINE_AUTOPTR_CLEANUP_FUNC
618 G_DEFINE_AUTOPTR_CLEANUP_FUNC(GstBuffer, gst_buffer_unref)
621 #ifdef G_DEFINE_AUTOPTR_CLEANUP_FUNC
622 G_DEFINE_AUTOPTR_CLEANUP_FUNC(GstBufferPool, gst_object_unref)
627 #endif /* __GST_BUFFER_H__ */