mirror of
https://gitlab.freedesktop.org/gstreamer/gstreamer.git
synced 2024-12-24 01:00:37 +00:00
af2fc026fc
Add refcounting to the GstAllocator object. Remove const from functions because the allocator is refcounted now. Rename the vmethods for consistency Expose the constructor for GstAllocator and add a destroy notify for the user_data. This should make it possible to create allocators that are not registered and shared globally along with the possibility to destroy them properly. Update defs with new symbols.
553 lines
20 KiB
C
553 lines
20 KiB
C
/* GStreamer
|
|
* Copyright (C) 1999,2000 Erik Walthinsen <omega@cse.ogi.edu>
|
|
* 2000 Wim Taymans <wtay@chello.be>
|
|
*
|
|
* gstbuffer.h: Header for GstBuffer object
|
|
*
|
|
* This library is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU Library General Public
|
|
* License as published by the Free Software Foundation; either
|
|
* version 2 of the License, or (at your option) any later version.
|
|
*
|
|
* This library is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
* Library General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU Library General Public
|
|
* License along with this library; if not, write to the
|
|
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
|
|
* Boston, MA 02111-1307, USA.
|
|
*/
|
|
|
|
|
|
#ifndef __GST_BUFFER_H__
|
|
#define __GST_BUFFER_H__
|
|
|
|
#include <gst/gstminiobject.h>
|
|
#include <gst/gstclock.h>
|
|
#include <gst/gstmemory.h>
|
|
|
|
G_BEGIN_DECLS
|
|
|
|
GST_EXPORT GType _gst_buffer_type;
|
|
|
|
typedef struct _GstBuffer GstBuffer;
|
|
typedef struct _GstBufferPool GstBufferPool;
|
|
|
|
/**
|
|
* GST_BUFFER_TRACE_NAME:
|
|
*
|
|
* The name used for tracing memory allocations.
|
|
*/
|
|
#define GST_BUFFER_TRACE_NAME "GstBuffer"
|
|
|
|
#define GST_TYPE_BUFFER (_gst_buffer_type)
|
|
#define GST_IS_BUFFER(obj) (GST_IS_MINI_OBJECT_TYPE(obj, GST_TYPE_BUFFER))
|
|
#define GST_BUFFER_CAST(obj) ((GstBuffer *)(obj))
|
|
#define GST_BUFFER(obj) (GST_BUFFER_CAST(obj))
|
|
|
|
/**
|
|
* GST_BUFFER_FLAGS:
|
|
* @buf: a #GstBuffer.
|
|
*
|
|
* A flags word containing #GstBufferFlag flags set on this buffer.
|
|
*/
|
|
#define GST_BUFFER_FLAGS(buf) GST_MINI_OBJECT_FLAGS(buf)
|
|
/**
|
|
* GST_BUFFER_FLAG_IS_SET:
|
|
* @buf: a #GstBuffer.
|
|
* @flag: the #GstBufferFlag to check.
|
|
*
|
|
* Gives the status of a specific flag on a buffer.
|
|
*/
|
|
#define GST_BUFFER_FLAG_IS_SET(buf,flag) GST_MINI_OBJECT_FLAG_IS_SET (buf, flag)
|
|
/**
|
|
* GST_BUFFER_FLAG_SET:
|
|
* @buf: a #GstBuffer.
|
|
* @flag: the #GstBufferFlag to set.
|
|
*
|
|
* Sets a buffer flag on a buffer.
|
|
*/
|
|
#define GST_BUFFER_FLAG_SET(buf,flag) GST_MINI_OBJECT_FLAG_SET (buf, flag)
|
|
/**
|
|
* GST_BUFFER_FLAG_UNSET:
|
|
* @buf: a #GstBuffer.
|
|
* @flag: the #GstBufferFlag to clear.
|
|
*
|
|
* Clears a buffer flag.
|
|
*/
|
|
#define GST_BUFFER_FLAG_UNSET(buf,flag) GST_MINI_OBJECT_FLAG_UNSET (buf, flag)
|
|
|
|
|
|
/**
|
|
* GST_BUFFER_PTS:
|
|
* @buf: a #GstBuffer.:
|
|
*
|
|
* The presentation timestamp (pts) in nanoseconds (as a #GstClockTime)
|
|
* of the data in the buffer. This is the timestamp when the media should be
|
|
* presented to the user.
|
|
* Value will be %GST_CLOCK_TIME_NONE if the pts is unknown.
|
|
*/
|
|
#define GST_BUFFER_PTS(buf) (GST_BUFFER_CAST(buf)->pts)
|
|
/**
|
|
* GST_BUFFER_DTS:
|
|
* @buf: a #GstBuffer.:
|
|
*
|
|
* The decoding timestamp (dts) in nanoseconds (as a #GstClockTime)
|
|
* of the data in the buffer. This is the timestamp when the media should be
|
|
* decoded or processed otherwise.
|
|
* Value will be %GST_CLOCK_TIME_NONE if the dts is unknown.
|
|
*/
|
|
#define GST_BUFFER_DTS(buf) (GST_BUFFER_CAST(buf)->dts)
|
|
/**
|
|
* GST_BUFFER_DURATION:
|
|
* @buf: a #GstBuffer.
|
|
*
|
|
* The duration in nanoseconds (as a #GstClockTime) of the data in the buffer.
|
|
* Value will be %GST_CLOCK_TIME_NONE if the duration is unknown.
|
|
*/
|
|
#define GST_BUFFER_DURATION(buf) (GST_BUFFER_CAST(buf)->duration)
|
|
/**
|
|
* GST_BUFFER_OFFSET:
|
|
* @buf: a #GstBuffer.
|
|
*
|
|
* The offset in the source file of the beginning of this buffer.
|
|
*/
|
|
#define GST_BUFFER_OFFSET(buf) (GST_BUFFER_CAST(buf)->offset)
|
|
/**
|
|
* GST_BUFFER_OFFSET_END:
|
|
* @buf: a #GstBuffer.
|
|
*
|
|
* The offset in the source file of the end of this buffer.
|
|
*/
|
|
#define GST_BUFFER_OFFSET_END(buf) (GST_BUFFER_CAST(buf)->offset_end)
|
|
|
|
/**
|
|
* GST_BUFFER_OFFSET_NONE:
|
|
*
|
|
* Constant for no-offset return results.
|
|
*/
|
|
#define GST_BUFFER_OFFSET_NONE ((guint64)-1)
|
|
|
|
/**
|
|
* GST_BUFFER_DURATION_IS_VALID:
|
|
* @buffer: a #GstBuffer
|
|
*
|
|
* Tests if the duration is known.
|
|
*/
|
|
#define GST_BUFFER_DURATION_IS_VALID(buffer) (GST_CLOCK_TIME_IS_VALID (GST_BUFFER_DURATION (buffer)))
|
|
/**
|
|
* GST_BUFFER_PTS_IS_VALID:
|
|
* @buffer: a #GstBuffer
|
|
*
|
|
* Tests if the pts is known.
|
|
*/
|
|
#define GST_BUFFER_PTS_IS_VALID(buffer) (GST_CLOCK_TIME_IS_VALID (GST_BUFFER_PTS (buffer)))
|
|
/**
|
|
* GST_BUFFER_DTS_IS_VALID:
|
|
* @buffer: a #GstBuffer
|
|
*
|
|
* Tests if the dts is known.
|
|
*/
|
|
#define GST_BUFFER_DTS_IS_VALID(buffer) (GST_CLOCK_TIME_IS_VALID (GST_BUFFER_DTS (buffer)))
|
|
/**
|
|
* GST_BUFFER_OFFSET_IS_VALID:
|
|
* @buffer: a #GstBuffer
|
|
*
|
|
* Tests if the start offset is known.
|
|
*/
|
|
#define GST_BUFFER_OFFSET_IS_VALID(buffer) (GST_BUFFER_OFFSET (buffer) != GST_BUFFER_OFFSET_NONE)
|
|
/**
|
|
* GST_BUFFER_OFFSET_END_IS_VALID:
|
|
* @buffer: a #GstBuffer
|
|
*
|
|
* Tests if the end offset is known.
|
|
*/
|
|
#define GST_BUFFER_OFFSET_END_IS_VALID(buffer) (GST_BUFFER_OFFSET_END (buffer) != GST_BUFFER_OFFSET_NONE)
|
|
/**
|
|
* GST_BUFFER_IS_DISCONT:
|
|
* @buffer: a #GstBuffer
|
|
*
|
|
* Tests if the buffer marks a discontinuity in the stream.
|
|
*
|
|
* Since: 0.10.9
|
|
*/
|
|
#define GST_BUFFER_IS_DISCONT(buffer) (GST_BUFFER_FLAG_IS_SET (buffer, GST_BUFFER_FLAG_DISCONT))
|
|
|
|
/**
|
|
* GstBufferFlags:
|
|
* @GST_BUFFER_FLAG_LIVE: the buffer is live data and should be discarded in
|
|
* the PAUSED state.
|
|
* @GST_BUFFER_FLAG_DECODE_ONLY: the buffer contains data that should be dropped
|
|
* because it will be clipped against the segment
|
|
* boundaries or because it does not contain data
|
|
* that should be shown to the user.
|
|
* @GST_BUFFER_FLAG_DISCONT: the buffer marks a data discontinuity in the stream.
|
|
* This typically occurs after a seek or a dropped buffer
|
|
* from a live or network source.
|
|
* @GST_BUFFER_FLAG_RESYNC: the buffer timestamps might have a discontinuity
|
|
* and this buffer is a good point to resynchronize.
|
|
* @GST_BUFFER_FLAG_CORRUPTED: the buffer data is corrupted.
|
|
* @GST_BUFFER_FLAG_MARKER: the buffer contains a media specific marker. for
|
|
* video this is typically the end of a frame boundary, for audio
|
|
* this is usually the end of a talkspurt.
|
|
* @GST_BUFFER_FLAG_HEADER: the buffer contains header information that is
|
|
* needed to decode the following data
|
|
* @GST_BUFFER_FLAG_GAP: the buffer has been created to fill a gap in the
|
|
* stream and contains media neutral data (elements can
|
|
* switch to optimized code path that ignores the buffer
|
|
* content).
|
|
* @GST_BUFFER_FLAG_DROPPABLE: the buffer can be dropped without breaking the
|
|
* stream, for example to reduce bandwidth.
|
|
* @GST_BUFFER_FLAG_DELTA_UNIT: this unit cannot be decoded independently.
|
|
* @GST_BUFFER_FLAG_IN_CAPS: the buffer has been added as a field in a #GstCaps.
|
|
* @GST_BUFFER_FLAG_LAST: additional media specific flags can be added starting from
|
|
* this flag.
|
|
*
|
|
* A set of buffer flags used to describe properties of a #GstBuffer.
|
|
*/
|
|
typedef enum {
|
|
GST_BUFFER_FLAG_LIVE = (GST_MINI_OBJECT_FLAG_LAST << 0),
|
|
GST_BUFFER_FLAG_DECODE_ONLY = (GST_MINI_OBJECT_FLAG_LAST << 1),
|
|
GST_BUFFER_FLAG_DISCONT = (GST_MINI_OBJECT_FLAG_LAST << 2),
|
|
GST_BUFFER_FLAG_RESYNC = (GST_MINI_OBJECT_FLAG_LAST << 3),
|
|
GST_BUFFER_FLAG_CORRUPTED = (GST_MINI_OBJECT_FLAG_LAST << 4),
|
|
GST_BUFFER_FLAG_MARKER = (GST_MINI_OBJECT_FLAG_LAST << 5),
|
|
GST_BUFFER_FLAG_HEADER = (GST_MINI_OBJECT_FLAG_LAST << 6),
|
|
GST_BUFFER_FLAG_GAP = (GST_MINI_OBJECT_FLAG_LAST << 7),
|
|
GST_BUFFER_FLAG_DROPPABLE = (GST_MINI_OBJECT_FLAG_LAST << 8),
|
|
GST_BUFFER_FLAG_DELTA_UNIT = (GST_MINI_OBJECT_FLAG_LAST << 9),
|
|
GST_BUFFER_FLAG_IN_CAPS = (GST_MINI_OBJECT_FLAG_LAST << 10),
|
|
|
|
GST_BUFFER_FLAG_LAST = (GST_MINI_OBJECT_FLAG_LAST << 16)
|
|
} GstBufferFlags;
|
|
|
|
/**
|
|
* GstBuffer:
|
|
* @mini_object: the parent structure
|
|
* @pool: pointer to the pool owner of the buffer
|
|
* @pts: presentation timestamp of the buffer, can be #GST_CLOCK_TIME_NONE when the
|
|
* pts is not known or relevant. The pts contains the timestamp when the
|
|
* media should be presented to the user.
|
|
* @dts: decoding timestamp of the buffer, can be #GST_CLOCK_TIME_NONE when the
|
|
* dts is not known or relevant. The dts contains the timestamp when the
|
|
* media should be processed.
|
|
* @duration: duration in time of the buffer data, can be #GST_CLOCK_TIME_NONE
|
|
* when the duration is not known or relevant.
|
|
* @offset: a media specific offset for the buffer data.
|
|
* For video frames, this is the frame number of this buffer.
|
|
* For audio samples, this is the offset of the first sample in this buffer.
|
|
* For file data or compressed data this is the byte offset of the first
|
|
* byte in this buffer.
|
|
* @offset_end: the last offset contained in this buffer. It has the same
|
|
* format as @offset.
|
|
*
|
|
* The structure of a #GstBuffer. Use the associated macros to access the public
|
|
* variables.
|
|
*/
|
|
struct _GstBuffer {
|
|
GstMiniObject mini_object;
|
|
|
|
/*< public >*/ /* with COW */
|
|
GstBufferPool *pool;
|
|
|
|
/* timestamp */
|
|
GstClockTime pts;
|
|
GstClockTime dts;
|
|
GstClockTime duration;
|
|
|
|
/* media specific offset */
|
|
guint64 offset;
|
|
guint64 offset_end;
|
|
};
|
|
|
|
GType gst_buffer_get_type (void);
|
|
|
|
/* allocation */
|
|
GstBuffer * gst_buffer_new (void);
|
|
GstBuffer * gst_buffer_new_allocate (GstAllocator * allocator, gsize size, gsize align);
|
|
GstBuffer * gst_buffer_new_wrapped_full (gpointer data, GFreeFunc free_func, gsize offset, gsize size);
|
|
GstBuffer * gst_buffer_new_wrapped (gpointer data, gsize size);
|
|
|
|
/* memory blocks */
|
|
guint gst_buffer_n_memory (GstBuffer *buffer);
|
|
void gst_buffer_take_memory (GstBuffer *buffer, gint idx, GstMemory *mem);
|
|
GstMemory * gst_buffer_peek_memory (GstBuffer *buffer, guint idx, GstMapFlags flags);
|
|
void gst_buffer_remove_memory_range (GstBuffer *buffer, guint idx, guint length);
|
|
|
|
/**
|
|
* gst_buffer_remove_memory:
|
|
* @b: a #GstBuffer.
|
|
* @i: an index
|
|
*
|
|
* Remove the memory block in @b at @i.
|
|
*/
|
|
#define gst_buffer_remove_memory(b,i) gst_buffer_remove_memory_range ((b), (i), 1)
|
|
|
|
gsize gst_buffer_fill (GstBuffer *buffer, gsize offset,
|
|
gconstpointer src, gsize size);
|
|
gsize gst_buffer_extract (GstBuffer *buffer, gsize offset,
|
|
gpointer dest, gsize size);
|
|
gint gst_buffer_memcmp (GstBuffer *buffer, gsize offset,
|
|
gconstpointer mem, gsize size);
|
|
gsize gst_buffer_memset (GstBuffer *buffer, gsize offset,
|
|
guint8 val, gsize size);
|
|
|
|
gsize gst_buffer_get_sizes (GstBuffer *buffer, gsize *offset, gsize *maxsize);
|
|
void gst_buffer_resize (GstBuffer *buffer, gssize offset, gssize size);
|
|
|
|
/**
|
|
* gst_buffer_get_size:
|
|
* @b: a #GstBuffer.
|
|
*
|
|
* Get the size of @b.
|
|
*/
|
|
#define gst_buffer_get_size(b) gst_buffer_get_sizes ((b), NULL, NULL)
|
|
/**
|
|
* gst_buffer_set_size:
|
|
* @b: a #GstBuffer.
|
|
* @s: a new size
|
|
*
|
|
* Set the size of @b to @s. This will remove or trim the memory blocks
|
|
* in the buffer.
|
|
*/
|
|
#define gst_buffer_set_size(b,s) gst_buffer_resize ((b), 0, (s))
|
|
|
|
gboolean gst_buffer_map (GstBuffer *buffer, GstMapInfo *info, GstMapFlags flags);
|
|
void gst_buffer_unmap (GstBuffer *buffer, GstMapInfo *info);
|
|
|
|
/* refcounting */
|
|
/**
|
|
* gst_buffer_ref:
|
|
* @buf: a #GstBuffer.
|
|
*
|
|
* Increases the refcount of the given buffer by one.
|
|
*
|
|
* Note that the refcount affects the writeability
|
|
* of @buf and its metadata, see gst_buffer_is_writable() and
|
|
* gst_buffer_is_metadata_writable(). It is
|
|
* important to note that keeping additional references to
|
|
* GstBuffer instances can potentially increase the number
|
|
* of memcpy operations in a pipeline.
|
|
*
|
|
* Returns: (transfer full): @buf
|
|
*/
|
|
#ifdef _FOOL_GTK_DOC_
|
|
G_INLINE_FUNC GstBuffer * gst_buffer_ref (GstBuffer * buf);
|
|
#endif
|
|
|
|
static inline GstBuffer *
|
|
gst_buffer_ref (GstBuffer * buf)
|
|
{
|
|
return (GstBuffer *) gst_mini_object_ref (GST_MINI_OBJECT_CAST (buf));
|
|
}
|
|
|
|
/**
|
|
* gst_buffer_unref:
|
|
* @buf: (transfer full): a #GstBuffer.
|
|
*
|
|
* Decreases the refcount of the buffer. If the refcount reaches 0, the buffer
|
|
* with the associated metadata and memory will be freed.
|
|
*/
|
|
#ifdef _FOOL_GTK_DOC_
|
|
G_INLINE_FUNC void gst_buffer_unref (GstBuffer * buf);
|
|
#endif
|
|
|
|
static inline void
|
|
gst_buffer_unref (GstBuffer * buf)
|
|
{
|
|
gst_mini_object_unref (GST_MINI_OBJECT_CAST (buf));
|
|
}
|
|
|
|
/* copy buffer */
|
|
/**
|
|
* gst_buffer_copy:
|
|
* @buf: a #GstBuffer.
|
|
*
|
|
* Create a copy of the given buffer. This will also make a newly allocated
|
|
* copy of the data the source buffer contains.
|
|
*
|
|
* Returns: (transfer full): a new copy of @buf.
|
|
*/
|
|
#ifdef _FOOL_GTK_DOC_
|
|
G_INLINE_FUNC GstBuffer * gst_buffer_copy (const GstBuffer * buf);
|
|
#endif
|
|
|
|
static inline GstBuffer *
|
|
gst_buffer_copy (const GstBuffer * buf)
|
|
{
|
|
return GST_BUFFER (gst_mini_object_copy (GST_MINI_OBJECT_CONST_CAST (buf)));
|
|
}
|
|
|
|
|
|
/**
|
|
* GstBufferCopyFlags:
|
|
* @GST_BUFFER_COPY_NONE: copy nothing
|
|
* @GST_BUFFER_COPY_FLAGS: flag indicating that buffer flags should be copied
|
|
* @GST_BUFFER_COPY_TIMESTAMPS: flag indicating that buffer pts, dts,
|
|
* duration, offset and offset_end should be copied
|
|
* @GST_BUFFER_COPY_MEMORY: flag indicating that buffer memory should be copied
|
|
* and appended to already existing memory
|
|
* @GST_BUFFER_COPY_MERGE: flag indicating that buffer memory should be
|
|
* merged
|
|
* @GST_BUFFER_COPY_META: flag indicating that buffer meta should be
|
|
* copied
|
|
*
|
|
* A set of flags that can be provided to the gst_buffer_copy_into()
|
|
* function to specify which items should be copied.
|
|
*/
|
|
typedef enum {
|
|
GST_BUFFER_COPY_NONE = 0,
|
|
GST_BUFFER_COPY_FLAGS = (1 << 0),
|
|
GST_BUFFER_COPY_TIMESTAMPS = (1 << 1),
|
|
GST_BUFFER_COPY_META = (1 << 2),
|
|
GST_BUFFER_COPY_MEMORY = (1 << 3),
|
|
GST_BUFFER_COPY_MERGE = (1 << 4)
|
|
} GstBufferCopyFlags;
|
|
|
|
/**
|
|
* GST_BUFFER_COPY_METADATA:
|
|
*
|
|
* Combination of all possible metadata fields that can be copied with
|
|
* gst_buffer_copy_into().
|
|
*/
|
|
#define GST_BUFFER_COPY_METADATA (GST_BUFFER_COPY_FLAGS | GST_BUFFER_COPY_TIMESTAMPS |\
|
|
GST_BUFFER_COPY_META)
|
|
|
|
/**
|
|
* GST_BUFFER_COPY_ALL:
|
|
*
|
|
* Combination of all possible fields that can be copied with
|
|
* gst_buffer_copy_into().
|
|
*/
|
|
#define GST_BUFFER_COPY_ALL ((GstBufferCopyFlags)(GST_BUFFER_COPY_METADATA | GST_BUFFER_COPY_MEMORY))
|
|
|
|
/* copies memory or metadata into newly allocated buffer */
|
|
void gst_buffer_copy_into (GstBuffer *dest, GstBuffer *src,
|
|
GstBufferCopyFlags flags,
|
|
gsize offset, gsize size);
|
|
|
|
/**
|
|
* gst_buffer_is_writable:
|
|
* @buf: a #GstBuffer
|
|
*
|
|
* Tests if you can safely write data into a buffer's data array or validly
|
|
* modify the caps and timestamp metadata. Metadata in a GstBuffer is always
|
|
* writable, but it is only safe to change it when there is only one owner
|
|
* of the buffer - ie, the refcount is 1.
|
|
*/
|
|
#define gst_buffer_is_writable(buf) gst_mini_object_is_writable (GST_MINI_OBJECT_CAST (buf))
|
|
/**
|
|
* gst_buffer_make_writable:
|
|
* @buf: (transfer full): a #GstBuffer
|
|
*
|
|
* Makes a writable buffer from the given buffer. If the source buffer is
|
|
* already writable, this will simply return the same buffer. A copy will
|
|
* otherwise be made using gst_buffer_copy().
|
|
*
|
|
* Returns: (transfer full): a writable buffer which may or may not be the
|
|
* same as @buf
|
|
*/
|
|
#define gst_buffer_make_writable(buf) GST_BUFFER_CAST (gst_mini_object_make_writable (GST_MINI_OBJECT_CAST (buf)))
|
|
|
|
/**
|
|
* gst_buffer_replace:
|
|
* @obuf: (inout) (transfer full): pointer to a pointer to a #GstBuffer to be
|
|
* replaced.
|
|
* @nbuf: (transfer none) (allow-none): pointer to a #GstBuffer that will
|
|
* replace the buffer pointed to by @obuf.
|
|
*
|
|
* Modifies a pointer to a #GstBuffer to point to a different #GstBuffer. The
|
|
* modification is done atomically (so this is useful for ensuring thread safety
|
|
* in some cases), and the reference counts are updated appropriately (the old
|
|
* buffer is unreffed, the new is reffed).
|
|
*
|
|
* Either @nbuf or the #GstBuffer pointed to by @obuf may be NULL.
|
|
*
|
|
* Returns: TRUE when @obuf was different from @nbuf.
|
|
*/
|
|
#ifdef _FOOL_GTK_DOC_
|
|
G_INLINE_FUNC gboolean gst_buffer_replace (GstBuffer **obuf, GstBuffer *nbuf);
|
|
#endif
|
|
|
|
static inline gboolean
|
|
gst_buffer_replace (GstBuffer **obuf, GstBuffer *nbuf)
|
|
{
|
|
return gst_mini_object_replace ((GstMiniObject **) obuf, (GstMiniObject *) nbuf);
|
|
}
|
|
|
|
/* creating a region */
|
|
GstBuffer* gst_buffer_copy_region (GstBuffer *parent, GstBufferCopyFlags flags,
|
|
gsize offset, gsize size);
|
|
|
|
/* span, two buffers, intelligently */
|
|
gboolean gst_buffer_is_span_fast (GstBuffer *buf1, GstBuffer *buf2);
|
|
GstBuffer* gst_buffer_span (GstBuffer *buf1, gsize offset, GstBuffer *buf2, gsize size) G_GNUC_MALLOC;
|
|
|
|
/* metadata */
|
|
#include <gst/gstmeta.h>
|
|
|
|
/**
|
|
* GstBufferMetaFunc:
|
|
* @buffer: a #GstBuffer
|
|
* @meta: a pointer to a #GstMeta
|
|
* @user_data: user data passed to gst_buffer_foreach_meta()
|
|
*
|
|
* A function that will be called from gst_buffer_foreach_meta(). The @meta
|
|
* field will point to a the reference of the meta.
|
|
*
|
|
* @buffer should not be modified from this callback.
|
|
*
|
|
* When this function returns %TRUE, the next meta will be
|
|
* returned. When %FALSE is returned, gst_buffer_foreach_meta() will return.
|
|
*
|
|
* When @meta is set to NULL, the item will be removed from the buffer.
|
|
*
|
|
* Returns: %FALSE when gst_buffer_foreach_meta() should stop
|
|
*/
|
|
typedef gboolean (*GstBufferForeachMetaFunc) (GstBuffer *buffer, GstMeta **meta,
|
|
gpointer user_data);
|
|
|
|
GstMeta * gst_buffer_get_meta (GstBuffer *buffer, const GstMetaInfo *info);
|
|
GstMeta * gst_buffer_add_meta (GstBuffer *buffer, const GstMetaInfo *info,
|
|
gpointer params);
|
|
gboolean gst_buffer_remove_meta (GstBuffer *buffer, GstMeta *meta);
|
|
|
|
GstMeta * gst_buffer_iterate_meta (GstBuffer *buffer, gpointer *state);
|
|
|
|
void gst_buffer_foreach_meta (GstBuffer *buffer,
|
|
GstBufferForeachMetaFunc func,
|
|
gpointer user_data);
|
|
|
|
/**
|
|
* gst_value_set_buffer:
|
|
* @v: a #GValue to receive the data
|
|
* @b: (transfer none): a #GstBuffer to assign to the GstValue
|
|
*
|
|
* Sets @b as the value of @v. Caller retains reference to buffer.
|
|
*/
|
|
#define gst_value_set_buffer(v,b) g_value_set_boxed((v),(b))
|
|
/**
|
|
* gst_value_take_buffer:
|
|
* @v: a #GValue to receive the data
|
|
* @b: (transfer full): a #GstBuffer to assign to the GstValue
|
|
*
|
|
* Sets @b as the value of @v. Caller gives away reference to buffer.
|
|
*/
|
|
#define gst_value_take_buffer(v,b) g_value_take_boxed(v,(b))
|
|
/**
|
|
* gst_value_get_buffer:
|
|
* @v: a #GValue to query
|
|
*
|
|
* Receives a #GstBuffer as the value of @v. Does not return a reference to
|
|
* the buffer, so the pointer is only valid for as long as the caller owns
|
|
* a reference to @v.
|
|
*
|
|
* Returns: (transfer none): buffer
|
|
*/
|
|
#define gst_value_get_buffer(v) GST_BUFFER_CAST (g_value_get_boxed(v))
|
|
|
|
G_END_DECLS
|
|
|
|
#endif /* __GST_BUFFER_H__ */
|