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>
30 #include <gst/gstcaps.h>
34 GST_EXPORT GType _gst_buffer_type;
36 typedef struct _GstBuffer GstBuffer;
37 typedef struct _GstBufferPool GstBufferPool;
39 #include <gst/gstmeta.h>
41 #define GST_TYPE_BUFFER (_gst_buffer_type)
42 #define GST_IS_BUFFER(obj) (GST_IS_MINI_OBJECT_TYPE(obj, GST_TYPE_BUFFER))
43 #define GST_BUFFER_CAST(obj) ((GstBuffer *)(obj))
44 #define GST_BUFFER(obj) (GST_BUFFER_CAST(obj))
50 * A flags word containing #GstBufferFlags flags set on this buffer.
52 #define GST_BUFFER_FLAGS(buf) GST_MINI_OBJECT_FLAGS(buf)
54 * GST_BUFFER_FLAG_IS_SET:
56 * @flag: the #GstBufferFlags flag to check.
58 * Gives the status of a specific flag on a buffer.
60 #define GST_BUFFER_FLAG_IS_SET(buf,flag) GST_MINI_OBJECT_FLAG_IS_SET (buf, flag)
62 * GST_BUFFER_FLAG_SET:
64 * @flag: the #GstBufferFlags flag to set.
66 * Sets a buffer flag on a buffer.
68 #define GST_BUFFER_FLAG_SET(buf,flag) GST_MINI_OBJECT_FLAG_SET (buf, flag)
70 * GST_BUFFER_FLAG_UNSET:
72 * @flag: the #GstBufferFlags flag to clear.
74 * Clears a buffer flag.
76 #define GST_BUFFER_FLAG_UNSET(buf,flag) GST_MINI_OBJECT_FLAG_UNSET (buf, flag)
81 * @buf: a #GstBuffer.:
83 * The presentation timestamp (pts) in nanoseconds (as a #GstClockTime)
84 * of the data in the buffer. This is the timestamp when the media should be
85 * presented to the user.
86 * Value will be %GST_CLOCK_TIME_NONE if the pts is unknown.
88 #define GST_BUFFER_PTS(buf) (GST_BUFFER_CAST(buf)->pts)
91 * @buf: a #GstBuffer.:
93 * The decoding timestamp (dts) in nanoseconds (as a #GstClockTime)
94 * of the data in the buffer. This is the timestamp when the media should be
95 * decoded or processed otherwise.
96 * Value will be %GST_CLOCK_TIME_NONE if the dts is unknown.
98 #define GST_BUFFER_DTS(buf) (GST_BUFFER_CAST(buf)->dts)
100 * GST_BUFFER_DTS_OR_PTS:
101 * @buf: a #GstBuffer.:
103 * Returns the buffer decoding timestamp (dts) if valid, else the buffer
104 * presentation time (pts)
108 #define GST_BUFFER_DTS_OR_PTS(buf) (GST_BUFFER_DTS_IS_VALID(buf) ? GST_BUFFER_DTS(buf) : GST_BUFFER_PTS (buf))
110 * GST_BUFFER_DURATION:
111 * @buf: a #GstBuffer.
113 * The duration in nanoseconds (as a #GstClockTime) of the data in the buffer.
114 * Value will be %GST_CLOCK_TIME_NONE if the duration is unknown.
116 #define GST_BUFFER_DURATION(buf) (GST_BUFFER_CAST(buf)->duration)
119 * @buf: a #GstBuffer.
121 * The offset in the source file of the beginning of this buffer.
123 #define GST_BUFFER_OFFSET(buf) (GST_BUFFER_CAST(buf)->offset)
125 * GST_BUFFER_OFFSET_END:
126 * @buf: a #GstBuffer.
128 * The offset in the source file of the end of this buffer.
130 #define GST_BUFFER_OFFSET_END(buf) (GST_BUFFER_CAST(buf)->offset_end)
133 * GST_BUFFER_OFFSET_NONE:
135 * Constant for no-offset return results.
137 #define GST_BUFFER_OFFSET_NONE ((guint64)-1)
140 * GST_BUFFER_DURATION_IS_VALID:
141 * @buffer: a #GstBuffer
143 * Tests if the duration is known.
145 #define GST_BUFFER_DURATION_IS_VALID(buffer) (GST_CLOCK_TIME_IS_VALID (GST_BUFFER_DURATION (buffer)))
147 * GST_BUFFER_PTS_IS_VALID:
148 * @buffer: a #GstBuffer
150 * Tests if the pts is known.
152 #define GST_BUFFER_PTS_IS_VALID(buffer) (GST_CLOCK_TIME_IS_VALID (GST_BUFFER_PTS (buffer)))
154 * GST_BUFFER_DTS_IS_VALID:
155 * @buffer: a #GstBuffer
157 * Tests if the dts is known.
159 #define GST_BUFFER_DTS_IS_VALID(buffer) (GST_CLOCK_TIME_IS_VALID (GST_BUFFER_DTS (buffer)))
161 * GST_BUFFER_OFFSET_IS_VALID:
162 * @buffer: a #GstBuffer
164 * Tests if the start offset is known.
166 #define GST_BUFFER_OFFSET_IS_VALID(buffer) (GST_BUFFER_OFFSET (buffer) != GST_BUFFER_OFFSET_NONE)
168 * GST_BUFFER_OFFSET_END_IS_VALID:
169 * @buffer: a #GstBuffer
171 * Tests if the end offset is known.
173 #define GST_BUFFER_OFFSET_END_IS_VALID(buffer) (GST_BUFFER_OFFSET_END (buffer) != GST_BUFFER_OFFSET_NONE)
175 * GST_BUFFER_IS_DISCONT:
176 * @buffer: a #GstBuffer
178 * Tests if the buffer marks a discontinuity in the stream.
180 #define GST_BUFFER_IS_DISCONT(buffer) (GST_BUFFER_FLAG_IS_SET (buffer, GST_BUFFER_FLAG_DISCONT))
184 * @GST_BUFFER_FLAG_LIVE: the buffer is live data and should be discarded in
186 * @GST_BUFFER_FLAG_DECODE_ONLY: the buffer contains data that should be dropped
187 * because it will be clipped against the segment
188 * boundaries or because it does not contain data
189 * that should be shown to the user.
190 * @GST_BUFFER_FLAG_DISCONT: the buffer marks a data discontinuity in the stream.
191 * This typically occurs after a seek or a dropped buffer
192 * from a live or network source.
193 * @GST_BUFFER_FLAG_RESYNC: the buffer timestamps might have a discontinuity
194 * and this buffer is a good point to resynchronize.
195 * @GST_BUFFER_FLAG_CORRUPTED: the buffer data is corrupted.
196 * @GST_BUFFER_FLAG_MARKER: the buffer contains a media specific marker. for
197 * video this is typically the end of a frame boundary, for audio
198 * this is usually the start of a talkspurt.
199 * @GST_BUFFER_FLAG_HEADER: the buffer contains header information that is
200 * needed to decode the following data.
201 * @GST_BUFFER_FLAG_GAP: the buffer has been created to fill a gap in the
202 * stream and contains media neutral data (elements can
203 * switch to optimized code path that ignores the buffer
205 * @GST_BUFFER_FLAG_DROPPABLE: the buffer can be dropped without breaking the
206 * stream, for example to reduce bandwidth.
207 * @GST_BUFFER_FLAG_DELTA_UNIT: this unit cannot be decoded independently.
208 * @GST_BUFFER_FLAG_TAG_MEMORY: this flag is set when memory of the buffer
210 * @GST_BUFFER_FLAG_SYNC_AFTER: Elements which write to disk or permanent
211 * storage should ensure the data is synced after
212 * writing the contents of this buffer. (Since 1.6)
213 * @GST_BUFFER_FLAG_LAST: additional media specific flags can be added starting from
216 * A set of buffer flags used to describe properties of a #GstBuffer.
219 GST_BUFFER_FLAG_LIVE = (GST_MINI_OBJECT_FLAG_LAST << 0),
220 GST_BUFFER_FLAG_DECODE_ONLY = (GST_MINI_OBJECT_FLAG_LAST << 1),
221 GST_BUFFER_FLAG_DISCONT = (GST_MINI_OBJECT_FLAG_LAST << 2),
222 GST_BUFFER_FLAG_RESYNC = (GST_MINI_OBJECT_FLAG_LAST << 3),
223 GST_BUFFER_FLAG_CORRUPTED = (GST_MINI_OBJECT_FLAG_LAST << 4),
224 GST_BUFFER_FLAG_MARKER = (GST_MINI_OBJECT_FLAG_LAST << 5),
225 GST_BUFFER_FLAG_HEADER = (GST_MINI_OBJECT_FLAG_LAST << 6),
226 GST_BUFFER_FLAG_GAP = (GST_MINI_OBJECT_FLAG_LAST << 7),
227 GST_BUFFER_FLAG_DROPPABLE = (GST_MINI_OBJECT_FLAG_LAST << 8),
228 GST_BUFFER_FLAG_DELTA_UNIT = (GST_MINI_OBJECT_FLAG_LAST << 9),
229 GST_BUFFER_FLAG_TAG_MEMORY = (GST_MINI_OBJECT_FLAG_LAST << 10),
230 GST_BUFFER_FLAG_SYNC_AFTER = (GST_MINI_OBJECT_FLAG_LAST << 11),
232 GST_BUFFER_FLAG_LAST = (GST_MINI_OBJECT_FLAG_LAST << 16)
237 * @mini_object: the parent structure
238 * @pool: pointer to the pool owner of the buffer
239 * @pts: presentation timestamp of the buffer, can be #GST_CLOCK_TIME_NONE when the
240 * pts is not known or relevant. The pts contains the timestamp when the
241 * media should be presented to the user.
242 * @dts: decoding timestamp of the buffer, can be #GST_CLOCK_TIME_NONE when the
243 * dts is not known or relevant. The dts contains the timestamp when the
244 * media should be processed.
245 * @duration: duration in time of the buffer data, can be #GST_CLOCK_TIME_NONE
246 * when the duration is not known or relevant.
247 * @offset: a media specific offset for the buffer data.
248 * For video frames, this is the frame number of this buffer.
249 * For audio samples, this is the offset of the first sample in this buffer.
250 * For file data or compressed data this is the byte offset of the first
251 * byte in this buffer.
252 * @offset_end: the last offset contained in this buffer. It has the same
255 * The structure of a #GstBuffer. Use the associated macros to access the public
259 GstMiniObject mini_object;
261 /*< public >*/ /* with COW */
267 GstClockTime duration;
269 /* media specific offset */
275 GType gst_buffer_get_type (void);
278 guint gst_buffer_get_max_memory (void);
283 GstBuffer * gst_buffer_new (void);
286 GstBuffer * gst_buffer_new_allocate (GstAllocator * allocator, gsize size,
287 GstAllocationParams * params);
289 GstBuffer * gst_buffer_new_wrapped_full (GstMemoryFlags flags, gpointer data, gsize maxsize,
290 gsize offset, gsize size, gpointer user_data,
291 GDestroyNotify notify);
293 GstBuffer * gst_buffer_new_wrapped (gpointer data, gsize size);
298 guint gst_buffer_n_memory (GstBuffer *buffer);
301 void gst_buffer_insert_memory (GstBuffer *buffer, gint idx, GstMemory *mem);
304 void gst_buffer_replace_memory_range (GstBuffer *buffer, guint idx, gint length, GstMemory *mem);
307 GstMemory * gst_buffer_peek_memory (GstBuffer *buffer, guint idx);
310 GstMemory * gst_buffer_get_memory_range (GstBuffer *buffer, guint idx, gint length);
313 void gst_buffer_remove_memory_range (GstBuffer *buffer, guint idx, gint length);
316 void gst_buffer_prepend_memory (GstBuffer *buffer, GstMemory *mem);
319 void gst_buffer_append_memory (GstBuffer *buffer, GstMemory *mem);
322 void gst_buffer_replace_memory (GstBuffer *buffer, guint idx, GstMemory *mem);
325 void gst_buffer_replace_all_memory (GstBuffer *buffer, GstMemory *mem);
328 GstMemory * gst_buffer_get_memory (GstBuffer *buffer, guint idx);
331 GstMemory * gst_buffer_get_all_memory (GstBuffer *buffer);
334 void gst_buffer_remove_memory (GstBuffer *buffer, guint idx);
337 void gst_buffer_remove_all_memory (GstBuffer *buffer);
340 gboolean gst_buffer_find_memory (GstBuffer *buffer, gsize offset, gsize size,
341 guint *idx, guint *length, gsize *skip);
343 gboolean gst_buffer_is_memory_range_writable (GstBuffer *buffer, guint idx, gint length);
346 gboolean gst_buffer_is_all_memory_writable (GstBuffer *buffer);
349 gsize gst_buffer_fill (GstBuffer *buffer, gsize offset,
350 gconstpointer src, gsize size);
352 gsize gst_buffer_extract (GstBuffer *buffer, gsize offset,
353 gpointer dest, gsize size);
355 gint gst_buffer_memcmp (GstBuffer *buffer, gsize offset,
356 gconstpointer mem, gsize size);
358 gsize gst_buffer_memset (GstBuffer *buffer, gsize offset,
359 guint8 val, gsize size);
361 gsize gst_buffer_get_sizes_range (GstBuffer *buffer, guint idx, gint length,
362 gsize *offset, gsize *maxsize);
364 gboolean gst_buffer_resize_range (GstBuffer *buffer, guint idx, gint length,
365 gssize offset, gssize size);
367 gsize gst_buffer_get_sizes (GstBuffer *buffer, gsize *offset, gsize *maxsize);
370 gsize gst_buffer_get_size (GstBuffer *buffer);
373 void gst_buffer_resize (GstBuffer *buffer, gssize offset, gssize size);
376 void gst_buffer_set_size (GstBuffer *buffer, gssize size);
379 gboolean gst_buffer_map_range (GstBuffer *buffer, guint idx, gint length,
380 GstMapInfo *info, GstMapFlags flags);
382 gboolean gst_buffer_map (GstBuffer *buffer, GstMapInfo *info, GstMapFlags flags);
385 void gst_buffer_unmap (GstBuffer *buffer, GstMapInfo *info);
388 void gst_buffer_extract_dup (GstBuffer *buffer, gsize offset,
389 gsize size, gpointer *dest,
392 GstBufferFlags gst_buffer_get_flags (GstBuffer * buffer);
395 gboolean gst_buffer_has_flags (GstBuffer * buffer, GstBufferFlags flags);
398 gboolean gst_buffer_set_flags (GstBuffer * buffer, GstBufferFlags flags);
401 gboolean gst_buffer_unset_flags (GstBuffer * buffer, GstBufferFlags flags);
408 * @buf: a #GstBuffer.
410 * Increases the refcount of the given buffer by one.
412 * Note that the refcount affects the writability
413 * of @buf and its metadata, see gst_buffer_is_writable().
414 * It is important to note that keeping additional references to
415 * GstBuffer instances can potentially increase the number
416 * of memcpy operations in a pipeline.
418 * Returns: (transfer full): @buf
420 static inline GstBuffer *
421 gst_buffer_ref (GstBuffer * buf)
423 return (GstBuffer *) gst_mini_object_ref (GST_MINI_OBJECT_CAST (buf));
428 * @buf: (transfer full): a #GstBuffer.
430 * Decreases the refcount of the buffer. If the refcount reaches 0, the buffer
431 * with the associated metadata and memory will be freed.
434 gst_buffer_unref (GstBuffer * buf)
436 gst_mini_object_unref (GST_MINI_OBJECT_CAST (buf));
442 * @buf: a #GstBuffer.
444 * Create a copy of the given buffer. This will only copy the buffer's
445 * data to a newly allocated memory if needed (if the type of memory
446 * requires it), otherwise the underlying data is just referenced.
447 * Check gst_buffer_copy_deep() if you want to force the data
448 * to be copied to newly allocated memory.
450 * Returns: (transfer full): a new copy of @buf.
452 static inline GstBuffer *
453 gst_buffer_copy (const GstBuffer * buf)
455 return GST_BUFFER (gst_mini_object_copy (GST_MINI_OBJECT_CONST_CAST (buf)));
459 GstBuffer * gst_buffer_copy_deep (const GstBuffer * buf);
462 * GstBufferCopyFlags:
463 * @GST_BUFFER_COPY_NONE: copy nothing
464 * @GST_BUFFER_COPY_FLAGS: flag indicating that buffer flags should be copied
465 * @GST_BUFFER_COPY_TIMESTAMPS: flag indicating that buffer pts, dts,
466 * duration, offset and offset_end should be copied
467 * @GST_BUFFER_COPY_MEMORY: flag indicating that buffer memory should be reffed
468 * and appended to already existing memory. Unless the memory is marked as
469 * NO_SHARE, no actual copy of the memory is made but it is simply reffed.
470 * Add @GST_BUFFER_COPY_DEEP to force a real copy.
471 * @GST_BUFFER_COPY_MERGE: flag indicating that buffer memory should be
473 * @GST_BUFFER_COPY_META: flag indicating that buffer meta should be
475 * @GST_BUFFER_COPY_DEEP: flag indicating that memory should always be
476 * copied instead of reffed (Since 1.2)
478 * A set of flags that can be provided to the gst_buffer_copy_into()
479 * function to specify which items should be copied.
482 GST_BUFFER_COPY_NONE = 0,
483 GST_BUFFER_COPY_FLAGS = (1 << 0),
484 GST_BUFFER_COPY_TIMESTAMPS = (1 << 1),
485 GST_BUFFER_COPY_META = (1 << 2),
486 GST_BUFFER_COPY_MEMORY = (1 << 3),
487 GST_BUFFER_COPY_MERGE = (1 << 4),
488 GST_BUFFER_COPY_DEEP = (1 << 5)
489 } GstBufferCopyFlags;
492 * GST_BUFFER_COPY_METADATA: (value 7) (type GstBufferCopyFlags)
494 * Combination of all possible metadata fields that can be copied with
495 * gst_buffer_copy_into().
497 #define GST_BUFFER_COPY_METADATA ((GstBufferCopyFlags) (GST_BUFFER_COPY_FLAGS |\
498 GST_BUFFER_COPY_TIMESTAMPS | GST_BUFFER_COPY_META))
501 * GST_BUFFER_COPY_ALL: (value 15) (type GstBufferCopyFlags)
503 * Combination of all possible fields that can be copied with
504 * gst_buffer_copy_into().
506 #define GST_BUFFER_COPY_ALL ((GstBufferCopyFlags)(GST_BUFFER_COPY_METADATA | GST_BUFFER_COPY_MEMORY))
508 /* copies memory or metadata into newly allocated buffer */
511 gboolean gst_buffer_copy_into (GstBuffer *dest, GstBuffer *src,
512 GstBufferCopyFlags flags,
513 gsize offset, gsize size);
516 * gst_buffer_is_writable:
519 * Tests if you can safely write to a buffer's metadata or its memory array.
520 * It is only safe to change buffer metadata when the current reference is
521 * writable, i.e. nobody can see the modifications you will make.
523 #define gst_buffer_is_writable(buf) gst_mini_object_is_writable (GST_MINI_OBJECT_CAST (buf))
525 * gst_buffer_make_writable:
526 * @buf: (transfer full): a #GstBuffer
528 * Returns a writable copy of @buf. If the source buffer is
529 * already writable, this will simply return the same buffer.
531 * Use this function to ensure that a buffer can be safely modified before
532 * making changes to it, including changing the metadata such as PTS/DTS.
534 * If the reference count of the source buffer @buf is exactly one, the caller
535 * is the sole owner and this function will return the buffer object unchanged.
537 * If there is more than one reference on the object, a copy will be made using
538 * gst_buffer_copy(). The passed-in @buf will be unreffed in that case, and the
539 * caller will now own a reference to the new returned buffer object. Note
540 * that this just copies the buffer structure itself, the underlying memory is
541 * not copied if it can be shared amongst multiple buffers.
543 * In short, this function unrefs the buf in the argument and refs the buffer
544 * that it returns. Don't access the argument after calling this function unless
545 * you have an additional reference to it.
547 * Returns: (transfer full): a writable buffer which may or may not be the
550 #define gst_buffer_make_writable(buf) GST_BUFFER_CAST (gst_mini_object_make_writable (GST_MINI_OBJECT_CAST (buf)))
553 * gst_buffer_replace:
554 * @obuf: (inout) (transfer full) (nullable): pointer to a pointer to
555 * a #GstBuffer to be replaced.
556 * @nbuf: (transfer none) (allow-none): pointer to a #GstBuffer that will
557 * replace the buffer pointed to by @obuf.
559 * Modifies a pointer to a #GstBuffer to point to a different #GstBuffer. The
560 * modification is done atomically (so this is useful for ensuring thread safety
561 * in some cases), and the reference counts are updated appropriately (the old
562 * buffer is unreffed, the new is reffed).
564 * Either @nbuf or the #GstBuffer pointed to by @obuf may be %NULL.
566 * Returns: %TRUE when @obuf was different from @nbuf.
568 static inline gboolean
569 gst_buffer_replace (GstBuffer **obuf, GstBuffer *nbuf)
571 return gst_mini_object_replace ((GstMiniObject **) obuf, (GstMiniObject *) nbuf);
574 /* creating a region */
577 GstBuffer* gst_buffer_copy_region (GstBuffer *parent, GstBufferCopyFlags flags,
578 gsize offset, gsize size);
580 /* append two buffers */
583 GstBuffer* gst_buffer_append_region (GstBuffer *buf1, GstBuffer *buf2,
584 gssize offset, gssize size);
586 GstBuffer* gst_buffer_append (GstBuffer *buf1, GstBuffer *buf2);
589 #include <gst/gstmeta.h>
592 * GstBufferForeachMetaFunc:
593 * @buffer: a #GstBuffer
594 * @meta: (out) (nullable): a pointer to a #GstMeta
595 * @user_data: user data passed to gst_buffer_foreach_meta()
597 * A function that will be called from gst_buffer_foreach_meta(). The @meta
598 * field will point to a the reference of the meta.
600 * @buffer should not be modified from this callback.
602 * When this function returns %TRUE, the next meta will be
603 * returned. When %FALSE is returned, gst_buffer_foreach_meta() will return.
605 * When @meta is set to %NULL, the item will be removed from the buffer.
607 * Returns: %FALSE when gst_buffer_foreach_meta() should stop
609 typedef gboolean (*GstBufferForeachMetaFunc) (GstBuffer *buffer, GstMeta **meta,
613 GstMeta * gst_buffer_get_meta (GstBuffer *buffer, GType api);
616 guint gst_buffer_get_n_meta (GstBuffer *buffer, GType api);
619 GstMeta * gst_buffer_add_meta (GstBuffer *buffer, const GstMetaInfo *info,
622 gboolean gst_buffer_remove_meta (GstBuffer *buffer, GstMeta *meta);
625 GstMeta * gst_buffer_iterate_meta (GstBuffer *buffer, gpointer *state);
628 GstMeta * gst_buffer_iterate_meta_filtered (GstBuffer * buffer,
630 GType meta_api_type);
632 gboolean gst_buffer_foreach_meta (GstBuffer *buffer,
633 GstBufferForeachMetaFunc func,
637 * gst_value_set_buffer:
638 * @v: a #GValue to receive the data
639 * @b: (transfer none): a #GstBuffer to assign to the GstValue
641 * Sets @b as the value of @v. Caller retains reference to buffer.
643 #define gst_value_set_buffer(v,b) g_value_set_boxed((v),(b))
645 * gst_value_take_buffer:
646 * @v: a #GValue to receive the data
647 * @b: (transfer full): a #GstBuffer to assign to the GstValue
649 * Sets @b as the value of @v. Caller gives away reference to buffer.
651 #define gst_value_take_buffer(v,b) g_value_take_boxed(v,(b))
653 * gst_value_get_buffer:
654 * @v: a #GValue to query
656 * Receives a #GstBuffer as the value of @v. Does not return a reference to
657 * the buffer, so the pointer is only valid for as long as the caller owns
660 * Returns: (transfer none): buffer
662 #define gst_value_get_buffer(v) GST_BUFFER_CAST (g_value_get_boxed(v))
664 typedef struct _GstParentBufferMeta GstParentBufferMeta;
667 * GstParentBufferMeta:
668 * @parent: the parent #GstMeta structure
669 * @buffer: the #GstBuffer on which a reference is being held.
671 * The #GstParentBufferMeta is a #GstMeta which can be attached to a #GstBuffer
672 * to hold a reference to another buffer that is only released when the child
673 * #GstBuffer is released.
675 * Typically, #GstParentBufferMeta is used when the child buffer is directly
676 * using the #GstMemory of the parent buffer, and wants to prevent the parent
677 * buffer from being returned to a buffer pool until the #GstMemory is available
682 struct _GstParentBufferMeta
691 GType gst_parent_buffer_meta_api_get_type (void);
692 #ifndef GST_DISABLE_DEPRECATED
693 #define GST_TYPE_PARENT_BUFFER_META_API_TYPE GST_PARENT_BUFFER_META_API_TYPE
695 #define GST_PARENT_BUFFER_META_API_TYPE (gst_parent_buffer_meta_api_get_type())
698 * gst_buffer_get_parent_buffer_meta:
701 * Find and return a #GstParentBufferMeta if one exists on the
704 #define gst_buffer_get_parent_buffer_meta(b) \
705 ((GstParentBufferMeta*)gst_buffer_get_meta((b),GST_PARENT_BUFFER_META_API_TYPE))
708 const GstMetaInfo *gst_parent_buffer_meta_get_info (void);
709 #define GST_PARENT_BUFFER_META_INFO (gst_parent_buffer_meta_get_info())
714 GstParentBufferMeta *gst_buffer_add_parent_buffer_meta (GstBuffer *buffer,
717 typedef struct _GstReferenceTimestampMeta GstReferenceTimestampMeta;
720 * GstReferenceTimestampMeta:
721 * @parent: the parent #GstMeta structure
722 * @reference: identifier for the timestamp reference.
723 * @timestamp: timestamp
724 * @duration: duration, or %GST_CLOCK_TIME_NONE
726 * #GstReferenceTimestampMeta can be used to attach alternative timestamps and
727 * possibly durations to a #GstBuffer. These are generally not according to
728 * the pipeline clock and could be e.g. the NTP timestamp when the media was
731 * The reference is stored as a #GstCaps in @reference. Examples of valid
732 * references would be "timestamp/x-drivername-stream" for timestamps that are locally
733 * generated by some driver named "drivername" when generating the stream,
734 * e.g. based on a frame counter, or "timestamp/x-ntp, host=pool.ntp.org,
735 * port=123" for timestamps based on a specific NTP server.
739 struct _GstReferenceTimestampMeta
745 GstClockTime timestamp, duration;
749 GType gst_reference_timestamp_meta_api_get_type (void);
750 #define GST_REFERENCE_TIMESTAMP_META_API_TYPE (gst_reference_timestamp_meta_api_get_type())
753 const GstMetaInfo *gst_reference_timestamp_meta_get_info (void);
754 #define GST_REFERENCE_TIMESTAMP_META_INFO (gst_reference_timestamp_meta_get_info())
759 GstReferenceTimestampMeta * gst_buffer_add_reference_timestamp_meta (GstBuffer * buffer,
761 GstClockTime timestamp,
762 GstClockTime duration);
765 GstReferenceTimestampMeta * gst_buffer_get_reference_timestamp_meta (GstBuffer * buffer,
766 GstCaps * reference);
768 #ifdef G_DEFINE_AUTOPTR_CLEANUP_FUNC
769 G_DEFINE_AUTOPTR_CLEANUP_FUNC(GstBuffer, gst_buffer_unref)
772 #ifdef G_DEFINE_AUTOPTR_CLEANUP_FUNC
773 G_DEFINE_AUTOPTR_CLEANUP_FUNC(GstBufferPool, gst_object_unref)
778 #endif /* __GST_BUFFER_H__ */