mirror of
https://gitlab.freedesktop.org/gstreamer/gstreamer.git
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bbca6b1ddf
Custom meta is backed by a GstStructure, and does not require that users of the API expose their GstMeta implementation as public API for other components to make use of it. In addition, it provides a simpler interface by ignoring the impl vs. api distinction that the regular API exposes. This new API is meant to be the meta counterpart to custom events and messages, and to be more convenient than the lower-level API when the absolute best performance isn't a requirement. Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/609>
813 lines
29 KiB
C
813 lines
29 KiB
C
/* GStreamer
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* Copyright (C) 1999,2000 Erik Walthinsen <omega@cse.ogi.edu>
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* 2000 Wim Taymans <wtay@chello.be>
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*
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* gstbuffer.h: Header for GstBuffer object
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
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* Boston, MA 02110-1301, USA.
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*/
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#ifndef __GST_BUFFER_H__
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#define __GST_BUFFER_H__
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#include <gst/gstminiobject.h>
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#include <gst/gstclock.h>
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#include <gst/gstallocator.h>
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#include <gst/gstcaps.h>
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G_BEGIN_DECLS
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GST_API GType _gst_buffer_type;
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typedef struct _GstBuffer GstBuffer;
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typedef struct _GstBufferPool GstBufferPool;
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#include <gst/gstmeta.h>
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#define GST_TYPE_BUFFER (_gst_buffer_type)
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#define GST_IS_BUFFER(obj) (GST_IS_MINI_OBJECT_TYPE(obj, GST_TYPE_BUFFER))
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#define GST_BUFFER_CAST(obj) ((GstBuffer *)(obj))
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#define GST_BUFFER(obj) (GST_BUFFER_CAST(obj))
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/**
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* GST_BUFFER_FLAGS:
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* @buf: a #GstBuffer.
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*
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* A flags word containing #GstBufferFlags flags set on this buffer.
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*/
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#define GST_BUFFER_FLAGS(buf) GST_MINI_OBJECT_FLAGS(buf)
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/**
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* GST_BUFFER_FLAG_IS_SET:
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* @buf: a #GstBuffer.
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* @flag: the #GstBufferFlags flag to check.
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*
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* Gives the status of a specific flag on a buffer.
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*/
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#define GST_BUFFER_FLAG_IS_SET(buf,flag) GST_MINI_OBJECT_FLAG_IS_SET (buf, flag)
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/**
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* GST_BUFFER_FLAG_SET:
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* @buf: a #GstBuffer.
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* @flag: the #GstBufferFlags flag to set.
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*
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* Sets a buffer flag on a buffer.
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*/
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#define GST_BUFFER_FLAG_SET(buf,flag) GST_MINI_OBJECT_FLAG_SET (buf, flag)
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/**
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* GST_BUFFER_FLAG_UNSET:
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* @buf: a #GstBuffer.
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* @flag: the #GstBufferFlags flag to clear.
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*
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* Clears a buffer flag.
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*/
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#define GST_BUFFER_FLAG_UNSET(buf,flag) GST_MINI_OBJECT_FLAG_UNSET (buf, flag)
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/**
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* GST_BUFFER_PTS:
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* @buf: a #GstBuffer.:
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*
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* The presentation timestamp (pts) in nanoseconds (as a #GstClockTime)
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* of the data in the buffer. This is the timestamp when the media should be
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* presented to the user.
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* Value will be %GST_CLOCK_TIME_NONE if the pts is unknown.
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*/
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#define GST_BUFFER_PTS(buf) (GST_BUFFER_CAST(buf)->pts)
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/**
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* GST_BUFFER_DTS:
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* @buf: a #GstBuffer.:
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*
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* The decoding timestamp (dts) in nanoseconds (as a #GstClockTime)
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* of the data in the buffer. This is the timestamp when the media should be
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* decoded or processed otherwise.
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* Value will be %GST_CLOCK_TIME_NONE if the dts is unknown.
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*/
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#define GST_BUFFER_DTS(buf) (GST_BUFFER_CAST(buf)->dts)
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/**
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* GST_BUFFER_DTS_OR_PTS:
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* @buf: a #GstBuffer.:
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*
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* Returns the buffer decoding timestamp (dts) if valid, else the buffer
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* presentation time (pts)
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*
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* Since: 1.8
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*/
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#define GST_BUFFER_DTS_OR_PTS(buf) (GST_BUFFER_DTS_IS_VALID(buf) ? GST_BUFFER_DTS(buf) : GST_BUFFER_PTS (buf))
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/**
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* GST_BUFFER_DURATION:
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* @buf: a #GstBuffer.
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*
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* The duration in nanoseconds (as a #GstClockTime) of the data in the buffer.
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* Value will be %GST_CLOCK_TIME_NONE if the duration is unknown.
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*/
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#define GST_BUFFER_DURATION(buf) (GST_BUFFER_CAST(buf)->duration)
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/**
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* GST_BUFFER_OFFSET:
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* @buf: a #GstBuffer.
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*
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* The offset in the source file of the beginning of this buffer.
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*/
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#define GST_BUFFER_OFFSET(buf) (GST_BUFFER_CAST(buf)->offset)
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/**
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* GST_BUFFER_OFFSET_END:
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* @buf: a #GstBuffer.
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*
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* The offset in the source file of the end of this buffer.
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*/
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#define GST_BUFFER_OFFSET_END(buf) (GST_BUFFER_CAST(buf)->offset_end)
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/**
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* GST_BUFFER_OFFSET_NONE:
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*
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* Constant for no-offset return results.
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*/
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#define GST_BUFFER_OFFSET_NONE ((guint64)-1)
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/**
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* GST_BUFFER_DURATION_IS_VALID:
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* @buffer: a #GstBuffer
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*
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* Tests if the duration is known.
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*/
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#define GST_BUFFER_DURATION_IS_VALID(buffer) (GST_CLOCK_TIME_IS_VALID (GST_BUFFER_DURATION (buffer)))
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/**
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* GST_BUFFER_PTS_IS_VALID:
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* @buffer: a #GstBuffer
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*
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* Tests if the pts is known.
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*/
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#define GST_BUFFER_PTS_IS_VALID(buffer) (GST_CLOCK_TIME_IS_VALID (GST_BUFFER_PTS (buffer)))
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/**
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* GST_BUFFER_DTS_IS_VALID:
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* @buffer: a #GstBuffer
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*
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* Tests if the dts is known.
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*/
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#define GST_BUFFER_DTS_IS_VALID(buffer) (GST_CLOCK_TIME_IS_VALID (GST_BUFFER_DTS (buffer)))
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/**
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* GST_BUFFER_OFFSET_IS_VALID:
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* @buffer: a #GstBuffer
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*
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* Tests if the start offset is known.
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*/
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#define GST_BUFFER_OFFSET_IS_VALID(buffer) (GST_BUFFER_OFFSET (buffer) != GST_BUFFER_OFFSET_NONE)
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/**
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* GST_BUFFER_OFFSET_END_IS_VALID:
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* @buffer: a #GstBuffer
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*
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* Tests if the end offset is known.
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*/
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#define GST_BUFFER_OFFSET_END_IS_VALID(buffer) (GST_BUFFER_OFFSET_END (buffer) != GST_BUFFER_OFFSET_NONE)
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/**
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* GST_BUFFER_IS_DISCONT:
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* @buffer: a #GstBuffer
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*
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* Tests if the buffer marks a discontinuity in the stream.
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*/
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#define GST_BUFFER_IS_DISCONT(buffer) (GST_BUFFER_FLAG_IS_SET (buffer, GST_BUFFER_FLAG_DISCONT))
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/**
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* GstBufferFlags:
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* @GST_BUFFER_FLAG_LIVE: the buffer is live data and should be discarded in
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* the PAUSED state.
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* @GST_BUFFER_FLAG_DECODE_ONLY: the buffer contains data that should be dropped
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* because it will be clipped against the segment
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* boundaries or because it does not contain data
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* that should be shown to the user.
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* @GST_BUFFER_FLAG_DISCONT: the buffer marks a data discontinuity in the stream.
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* This typically occurs after a seek or a dropped buffer
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* from a live or network source.
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* @GST_BUFFER_FLAG_RESYNC: the buffer timestamps might have a discontinuity
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* and this buffer is a good point to resynchronize.
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* @GST_BUFFER_FLAG_CORRUPTED: the buffer data is corrupted.
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* @GST_BUFFER_FLAG_MARKER: the buffer contains a media specific marker. for
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* video this is the end of a frame boundary, for audio
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* this is the start of a talkspurt.
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* @GST_BUFFER_FLAG_HEADER: the buffer contains header information that is
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* needed to decode the following data.
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* @GST_BUFFER_FLAG_GAP: the buffer has been created to fill a gap in the
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* stream and contains media neutral data (elements can
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* switch to optimized code path that ignores the buffer
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* content).
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* @GST_BUFFER_FLAG_DROPPABLE: the buffer can be dropped without breaking the
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* stream, for example to reduce bandwidth.
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* @GST_BUFFER_FLAG_DELTA_UNIT: this unit cannot be decoded independently.
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* @GST_BUFFER_FLAG_TAG_MEMORY: this flag is set when memory of the buffer
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* is added/removed
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* @GST_BUFFER_FLAG_SYNC_AFTER: Elements which write to disk or permanent
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* storage should ensure the data is synced after
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* writing the contents of this buffer. (Since: 1.6)
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* @GST_BUFFER_FLAG_NON_DROPPABLE: This buffer is important and should not be dropped.
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* This can be used to mark important buffers, e.g. to flag
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* RTP packets carrying keyframes or codec setup data for RTP
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* Forward Error Correction purposes, or to prevent still video
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* frames from being dropped by elements due to QoS. (Since: 1.14)
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* @GST_BUFFER_FLAG_LAST: additional media specific flags can be added starting from
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* this flag.
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*
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* A set of buffer flags used to describe properties of a #GstBuffer.
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*/
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typedef enum {
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GST_BUFFER_FLAG_LIVE = (GST_MINI_OBJECT_FLAG_LAST << 0),
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GST_BUFFER_FLAG_DECODE_ONLY = (GST_MINI_OBJECT_FLAG_LAST << 1),
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GST_BUFFER_FLAG_DISCONT = (GST_MINI_OBJECT_FLAG_LAST << 2),
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GST_BUFFER_FLAG_RESYNC = (GST_MINI_OBJECT_FLAG_LAST << 3),
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GST_BUFFER_FLAG_CORRUPTED = (GST_MINI_OBJECT_FLAG_LAST << 4),
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GST_BUFFER_FLAG_MARKER = (GST_MINI_OBJECT_FLAG_LAST << 5),
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GST_BUFFER_FLAG_HEADER = (GST_MINI_OBJECT_FLAG_LAST << 6),
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GST_BUFFER_FLAG_GAP = (GST_MINI_OBJECT_FLAG_LAST << 7),
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GST_BUFFER_FLAG_DROPPABLE = (GST_MINI_OBJECT_FLAG_LAST << 8),
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GST_BUFFER_FLAG_DELTA_UNIT = (GST_MINI_OBJECT_FLAG_LAST << 9),
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GST_BUFFER_FLAG_TAG_MEMORY = (GST_MINI_OBJECT_FLAG_LAST << 10),
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GST_BUFFER_FLAG_SYNC_AFTER = (GST_MINI_OBJECT_FLAG_LAST << 11),
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GST_BUFFER_FLAG_NON_DROPPABLE = (GST_MINI_OBJECT_FLAG_LAST << 12),
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GST_BUFFER_FLAG_LAST = (GST_MINI_OBJECT_FLAG_LAST << 16)
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} GstBufferFlags;
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/**
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* GstBuffer:
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* @mini_object: the parent structure
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* @pool: pointer to the pool owner of the buffer
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* @pts: presentation timestamp of the buffer, can be #GST_CLOCK_TIME_NONE when the
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* pts is not known or relevant. The pts contains the timestamp when the
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* media should be presented to the user.
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* @dts: decoding timestamp of the buffer, can be #GST_CLOCK_TIME_NONE when the
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* dts is not known or relevant. The dts contains the timestamp when the
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* media should be processed.
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* @duration: duration in time of the buffer data, can be #GST_CLOCK_TIME_NONE
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* when the duration is not known or relevant.
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* @offset: a media specific offset for the buffer data.
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* For video frames, this is the frame number of this buffer.
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* For audio samples, this is the offset of the first sample in this buffer.
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* For file data or compressed data this is the byte offset of the first
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* byte in this buffer.
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* @offset_end: the last offset contained in this buffer. It has the same
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* format as @offset.
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*
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* The structure of a #GstBuffer. Use the associated macros to access the public
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* variables.
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*/
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struct _GstBuffer {
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GstMiniObject mini_object;
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/*< public >*/ /* with COW */
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GstBufferPool *pool;
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/* timestamp */
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GstClockTime pts;
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GstClockTime dts;
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GstClockTime duration;
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/* media specific offset */
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guint64 offset;
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guint64 offset_end;
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};
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GST_API
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GType gst_buffer_get_type (void);
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GST_API
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guint gst_buffer_get_max_memory (void);
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/* allocation */
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GST_API
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GstBuffer * gst_buffer_new (void);
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GST_API
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GstBuffer * gst_buffer_new_allocate (GstAllocator * allocator, gsize size,
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GstAllocationParams * params);
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GST_API
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GstBuffer * gst_buffer_new_wrapped_full (GstMemoryFlags flags, gpointer data, gsize maxsize,
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gsize offset, gsize size, gpointer user_data,
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GDestroyNotify notify);
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GST_API
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GstBuffer * gst_buffer_new_wrapped (gpointer data, gsize size);
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GST_API
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GstBuffer * gst_buffer_new_wrapped_bytes (GBytes * bytes);
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/* memory blocks */
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GST_API
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guint gst_buffer_n_memory (GstBuffer *buffer);
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GST_API
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void gst_buffer_insert_memory (GstBuffer *buffer, gint idx, GstMemory *mem);
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GST_API
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void gst_buffer_replace_memory_range (GstBuffer *buffer, guint idx, gint length, GstMemory *mem);
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GST_API
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GstMemory * gst_buffer_peek_memory (GstBuffer *buffer, guint idx);
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GST_API
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GstMemory * gst_buffer_get_memory_range (GstBuffer *buffer, guint idx, gint length);
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GST_API
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void gst_buffer_remove_memory_range (GstBuffer *buffer, guint idx, gint length);
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GST_API
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void gst_buffer_prepend_memory (GstBuffer *buffer, GstMemory *mem);
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GST_API
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void gst_buffer_append_memory (GstBuffer *buffer, GstMemory *mem);
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GST_API
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void gst_buffer_replace_memory (GstBuffer *buffer, guint idx, GstMemory *mem);
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GST_API
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void gst_buffer_replace_all_memory (GstBuffer *buffer, GstMemory *mem);
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GST_API
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GstMemory * gst_buffer_get_memory (GstBuffer *buffer, guint idx);
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GST_API
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GstMemory * gst_buffer_get_all_memory (GstBuffer *buffer);
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GST_API
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void gst_buffer_remove_memory (GstBuffer *buffer, guint idx);
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GST_API
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void gst_buffer_remove_all_memory (GstBuffer *buffer);
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GST_API
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gboolean gst_buffer_find_memory (GstBuffer *buffer, gsize offset, gsize size,
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guint *idx, guint *length, gsize *skip);
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GST_API
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gboolean gst_buffer_is_memory_range_writable (GstBuffer *buffer, guint idx, gint length);
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GST_API
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gboolean gst_buffer_is_all_memory_writable (GstBuffer *buffer);
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GST_API
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gsize gst_buffer_fill (GstBuffer *buffer, gsize offset,
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gconstpointer src, gsize size);
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GST_API
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gsize gst_buffer_extract (GstBuffer *buffer, gsize offset,
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gpointer dest, gsize size);
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GST_API
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gint gst_buffer_memcmp (GstBuffer *buffer, gsize offset,
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gconstpointer mem, gsize size);
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GST_API
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gsize gst_buffer_memset (GstBuffer *buffer, gsize offset,
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guint8 val, gsize size);
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GST_API
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gsize gst_buffer_get_sizes_range (GstBuffer *buffer, guint idx, gint length,
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gsize *offset, gsize *maxsize);
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GST_API
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gboolean gst_buffer_resize_range (GstBuffer *buffer, guint idx, gint length,
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gssize offset, gssize size);
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GST_API
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gsize gst_buffer_get_sizes (GstBuffer *buffer, gsize *offset, gsize *maxsize);
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GST_API
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gsize gst_buffer_get_size (GstBuffer *buffer);
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GST_API
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void gst_buffer_resize (GstBuffer *buffer, gssize offset, gssize size);
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GST_API
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void gst_buffer_set_size (GstBuffer *buffer, gssize size);
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GST_API
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gboolean gst_buffer_map_range (GstBuffer *buffer, guint idx, gint length,
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GstMapInfo *info, GstMapFlags flags);
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GST_API
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gboolean gst_buffer_map (GstBuffer *buffer, GstMapInfo *info, GstMapFlags flags);
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GST_API
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void gst_buffer_unmap (GstBuffer *buffer, GstMapInfo *info);
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GST_API
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void gst_buffer_extract_dup (GstBuffer *buffer, gsize offset,
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gsize size, gpointer *dest,
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gsize *dest_size);
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GST_API
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GstBufferFlags gst_buffer_get_flags (GstBuffer * buffer);
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GST_API
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gboolean gst_buffer_has_flags (GstBuffer * buffer, GstBufferFlags flags);
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GST_API
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gboolean gst_buffer_set_flags (GstBuffer * buffer, GstBufferFlags flags);
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GST_API
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gboolean gst_buffer_unset_flags (GstBuffer * buffer, GstBufferFlags flags);
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/* refcounting */
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/**
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* gst_buffer_ref: (skip)
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* @buf: a #GstBuffer.
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*
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* Increases the refcount of the given buffer by one.
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*
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* Note that the refcount affects the writability
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* of @buf and its metadata, see gst_buffer_is_writable().
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* It is important to note that keeping additional references to
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* GstBuffer instances can potentially increase the number
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* of memcpy operations in a pipeline.
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*
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* Returns: (transfer full): @buf
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*/
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static inline GstBuffer* gst_buffer_ref(GstBuffer* buf);
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static inline GstBuffer *
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gst_buffer_ref (GstBuffer * buf)
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{
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return (GstBuffer *) gst_mini_object_ref (GST_MINI_OBJECT_CAST (buf));
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}
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/**
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* gst_buffer_unref: (skip)
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* @buf: (transfer full): a #GstBuffer.
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*
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* Decreases the refcount of the buffer. If the refcount reaches 0, the buffer
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* with the associated metadata and memory will be freed.
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*/
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static inline void gst_buffer_unref(GstBuffer* buf);
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static inline void
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gst_buffer_unref (GstBuffer * buf)
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{
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gst_mini_object_unref (GST_MINI_OBJECT_CAST (buf));
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}
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|
|
/**
|
|
* gst_clear_buffer: (skip)
|
|
* @buf_ptr: a pointer to a #GstBuffer reference
|
|
*
|
|
* Clears a reference to a #GstBuffer.
|
|
*
|
|
* @buf_ptr must not be %NULL.
|
|
*
|
|
* If the reference is %NULL then this function does nothing. Otherwise, the
|
|
* reference count of the buffer is decreased and the pointer is set to %NULL.
|
|
*
|
|
* Since: 1.16
|
|
*/
|
|
static inline void
|
|
gst_clear_buffer (GstBuffer ** buf_ptr)
|
|
{
|
|
gst_clear_mini_object ((GstMiniObject **) buf_ptr);
|
|
}
|
|
|
|
/* copy buffer */
|
|
/**
|
|
* gst_buffer_copy: (skip)
|
|
* @buf: a #GstBuffer.
|
|
*
|
|
* Create a copy of the given buffer. This will only copy the buffer's
|
|
* data to a newly allocated memory if needed (if the type of memory
|
|
* requires it), otherwise the underlying data is just referenced.
|
|
* Check gst_buffer_copy_deep() if you want to force the data
|
|
* to be copied to newly allocated memory.
|
|
*
|
|
* Returns: (transfer full): a new copy of @buf.
|
|
*/
|
|
static inline GstBuffer* gst_buffer_copy(const GstBuffer* buf);
|
|
static inline GstBuffer *
|
|
gst_buffer_copy (const GstBuffer * buf)
|
|
{
|
|
return GST_BUFFER (gst_mini_object_copy (GST_MINI_OBJECT_CONST_CAST (buf)));
|
|
}
|
|
|
|
GST_API
|
|
GstBuffer * gst_buffer_copy_deep (const GstBuffer * 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 reffed
|
|
* and appended to already existing memory. Unless the memory is marked as
|
|
* NO_SHARE, no actual copy of the memory is made but it is simply reffed.
|
|
* Add @GST_BUFFER_COPY_DEEP to force a real copy.
|
|
* @GST_BUFFER_COPY_MERGE: flag indicating that buffer memory should be
|
|
* merged
|
|
* @GST_BUFFER_COPY_META: flag indicating that buffer meta should be
|
|
* copied
|
|
* @GST_BUFFER_COPY_DEEP: flag indicating that memory should always be
|
|
* copied instead of reffed (Since: 1.2)
|
|
*
|
|
* 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),
|
|
GST_BUFFER_COPY_DEEP = (1 << 5)
|
|
} GstBufferCopyFlags;
|
|
|
|
/**
|
|
* GST_BUFFER_COPY_METADATA: (value 7) (type GstBufferCopyFlags)
|
|
*
|
|
* Combination of all possible metadata fields that can be copied with
|
|
* gst_buffer_copy_into().
|
|
*/
|
|
#define GST_BUFFER_COPY_METADATA ((GstBufferCopyFlags) (GST_BUFFER_COPY_FLAGS |\
|
|
GST_BUFFER_COPY_TIMESTAMPS | GST_BUFFER_COPY_META))
|
|
|
|
/**
|
|
* GST_BUFFER_COPY_ALL: (value 15) (type GstBufferCopyFlags)
|
|
*
|
|
* 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 */
|
|
|
|
GST_API
|
|
gboolean 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 to a buffer's metadata or its memory array.
|
|
* It is only safe to change buffer metadata when the current reference is
|
|
* writable, i.e. nobody can see the modifications you will make.
|
|
*/
|
|
#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
|
|
*
|
|
* Returns a writable copy of @buf. If the source buffer is
|
|
* already writable, this will simply return the same buffer.
|
|
*
|
|
* Use this function to ensure that a buffer can be safely modified before
|
|
* making changes to it, including changing the metadata such as PTS/DTS.
|
|
*
|
|
* If the reference count of the source buffer @buf is exactly one, the caller
|
|
* is the sole owner and this function will return the buffer object unchanged.
|
|
*
|
|
* If there is more than one reference on the object, a copy will be made using
|
|
* gst_buffer_copy(). The passed-in @buf will be unreffed in that case, and the
|
|
* caller will now own a reference to the new returned buffer object. Note
|
|
* that this just copies the buffer structure itself, the underlying memory is
|
|
* not copied if it can be shared amongst multiple buffers.
|
|
*
|
|
* In short, this function unrefs the buf in the argument and refs the buffer
|
|
* that it returns. Don't access the argument after calling this function unless
|
|
* you have an additional reference to it.
|
|
*
|
|
* 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: (skip)
|
|
* @obuf: (inout) (transfer full) (nullable): 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.
|
|
*/
|
|
static inline gboolean gst_buffer_replace(GstBuffer** obuf, GstBuffer* nbuf);
|
|
static inline gboolean
|
|
gst_buffer_replace (GstBuffer **obuf, GstBuffer *nbuf)
|
|
{
|
|
return gst_mini_object_replace ((GstMiniObject **) obuf, (GstMiniObject *) nbuf);
|
|
}
|
|
|
|
/* creating a region */
|
|
|
|
GST_API
|
|
GstBuffer* gst_buffer_copy_region (GstBuffer *parent, GstBufferCopyFlags flags,
|
|
gsize offset, gsize size);
|
|
|
|
/* append two buffers */
|
|
|
|
GST_API
|
|
GstBuffer* gst_buffer_append_region (GstBuffer *buf1, GstBuffer *buf2,
|
|
gssize offset, gssize size);
|
|
GST_API
|
|
GstBuffer* gst_buffer_append (GstBuffer *buf1, GstBuffer *buf2);
|
|
|
|
/* metadata */
|
|
#include <gst/gstmeta.h>
|
|
|
|
/**
|
|
* GstBufferForeachMetaFunc:
|
|
* @buffer: a #GstBuffer
|
|
* @meta: (out) (nullable): 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);
|
|
|
|
GST_API
|
|
GstMeta * gst_buffer_get_meta (GstBuffer *buffer, GType api);
|
|
|
|
GST_API
|
|
guint gst_buffer_get_n_meta (GstBuffer *buffer, GType api_type);
|
|
|
|
GST_API
|
|
GstMeta * gst_buffer_add_meta (GstBuffer *buffer, const GstMetaInfo *info,
|
|
gpointer params);
|
|
GST_API
|
|
gboolean gst_buffer_remove_meta (GstBuffer *buffer, GstMeta *meta);
|
|
|
|
GST_API
|
|
GstMeta * gst_buffer_iterate_meta (GstBuffer *buffer, gpointer *state);
|
|
|
|
GST_API
|
|
GstMeta * gst_buffer_iterate_meta_filtered (GstBuffer * buffer,
|
|
gpointer * state,
|
|
GType meta_api_type);
|
|
GST_API
|
|
gboolean gst_buffer_foreach_meta (GstBuffer *buffer,
|
|
GstBufferForeachMetaFunc func,
|
|
gpointer user_data);
|
|
|
|
GST_API
|
|
GstCustomMeta * gst_buffer_add_custom_meta (GstBuffer *buffer,
|
|
const gchar *name);
|
|
|
|
GST_API
|
|
GstCustomMeta * gst_buffer_get_custom_meta (GstBuffer *buffer,
|
|
const gchar *name);
|
|
|
|
/**
|
|
* 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))
|
|
|
|
typedef struct _GstParentBufferMeta GstParentBufferMeta;
|
|
|
|
/**
|
|
* GstParentBufferMeta:
|
|
* @parent: the parent #GstMeta structure
|
|
* @buffer: the #GstBuffer on which a reference is being held.
|
|
*
|
|
* The #GstParentBufferMeta is a #GstMeta which can be attached to a #GstBuffer
|
|
* to hold a reference to another buffer that is only released when the child
|
|
* #GstBuffer is released.
|
|
*
|
|
* Typically, #GstParentBufferMeta is used when the child buffer is directly
|
|
* using the #GstMemory of the parent buffer, and wants to prevent the parent
|
|
* buffer from being returned to a buffer pool until the #GstMemory is available
|
|
* for re-use.
|
|
*
|
|
* Since: 1.6
|
|
*/
|
|
struct _GstParentBufferMeta
|
|
{
|
|
GstMeta parent;
|
|
|
|
/*< public >*/
|
|
GstBuffer *buffer;
|
|
};
|
|
|
|
GST_API
|
|
GType gst_parent_buffer_meta_api_get_type (void);
|
|
#ifndef GST_DISABLE_DEPRECATED
|
|
#define GST_TYPE_PARENT_BUFFER_META_API_TYPE GST_PARENT_BUFFER_META_API_TYPE
|
|
#endif
|
|
#define GST_PARENT_BUFFER_META_API_TYPE (gst_parent_buffer_meta_api_get_type())
|
|
|
|
/**
|
|
* gst_buffer_get_parent_buffer_meta:
|
|
* @b: a #GstBuffer
|
|
*
|
|
* Find and return a #GstParentBufferMeta if one exists on the
|
|
* buffer
|
|
*/
|
|
#define gst_buffer_get_parent_buffer_meta(b) \
|
|
((GstParentBufferMeta*)gst_buffer_get_meta((b),GST_PARENT_BUFFER_META_API_TYPE))
|
|
|
|
GST_API
|
|
const GstMetaInfo *gst_parent_buffer_meta_get_info (void);
|
|
#define GST_PARENT_BUFFER_META_INFO (gst_parent_buffer_meta_get_info())
|
|
|
|
/* implementation */
|
|
|
|
GST_API
|
|
GstParentBufferMeta *gst_buffer_add_parent_buffer_meta (GstBuffer *buffer,
|
|
GstBuffer *ref);
|
|
|
|
typedef struct _GstReferenceTimestampMeta GstReferenceTimestampMeta;
|
|
|
|
/**
|
|
* GstReferenceTimestampMeta:
|
|
* @parent: the parent #GstMeta structure
|
|
* @reference: identifier for the timestamp reference.
|
|
* @timestamp: timestamp
|
|
* @duration: duration, or %GST_CLOCK_TIME_NONE
|
|
*
|
|
* #GstReferenceTimestampMeta can be used to attach alternative timestamps and
|
|
* possibly durations to a #GstBuffer. These are generally not according to
|
|
* the pipeline clock and could be e.g. the NTP timestamp when the media was
|
|
* captured.
|
|
*
|
|
* The reference is stored as a #GstCaps in @reference. Examples of valid
|
|
* references would be "timestamp/x-drivername-stream" for timestamps that are locally
|
|
* generated by some driver named "drivername" when generating the stream,
|
|
* e.g. based on a frame counter, or "timestamp/x-ntp, host=pool.ntp.org,
|
|
* port=123" for timestamps based on a specific NTP server.
|
|
*
|
|
* Since: 1.14
|
|
*/
|
|
struct _GstReferenceTimestampMeta
|
|
{
|
|
GstMeta parent;
|
|
|
|
/*< public >*/
|
|
GstCaps *reference;
|
|
GstClockTime timestamp, duration;
|
|
};
|
|
|
|
GST_API
|
|
GType gst_reference_timestamp_meta_api_get_type (void);
|
|
#define GST_REFERENCE_TIMESTAMP_META_API_TYPE (gst_reference_timestamp_meta_api_get_type())
|
|
|
|
GST_API
|
|
const GstMetaInfo *gst_reference_timestamp_meta_get_info (void);
|
|
#define GST_REFERENCE_TIMESTAMP_META_INFO (gst_reference_timestamp_meta_get_info())
|
|
|
|
/* implementation */
|
|
|
|
GST_API
|
|
GstReferenceTimestampMeta * gst_buffer_add_reference_timestamp_meta (GstBuffer * buffer,
|
|
GstCaps * reference,
|
|
GstClockTime timestamp,
|
|
GstClockTime duration);
|
|
|
|
GST_API
|
|
GstReferenceTimestampMeta * gst_buffer_get_reference_timestamp_meta (GstBuffer * buffer,
|
|
GstCaps * reference);
|
|
|
|
G_DEFINE_AUTOPTR_CLEANUP_FUNC(GstBuffer, gst_buffer_unref)
|
|
|
|
G_DEFINE_AUTOPTR_CLEANUP_FUNC(GstBufferPool, gst_object_unref)
|
|
|
|
G_END_DECLS
|
|
|
|
#endif /* __GST_BUFFER_H__ */
|