mirror of
https://gitlab.freedesktop.org/gstreamer/gstreamer.git
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8468dadc77
Add first implementation of arbitrary buffer metadata. We use a simple linked linked of slice allocated metadata chunks. Future implementations could use something more performant. Add get, remove, iterate methods to handle the metadata.
511 lines
17 KiB
C
511 lines
17 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., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, 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/gstcaps.h>
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G_BEGIN_DECLS
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typedef struct _GstBuffer GstBuffer;
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extern GType _gst_buffer_type;
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/**
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* GST_BUFFER_TRACE_NAME:
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*
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* The name used for tracing memory allocations.
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*/
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#define GST_BUFFER_TRACE_NAME "GstBuffer"
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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 #GstBufferFlag 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 #GstBufferFlag 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 #GstBufferFlag 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 #GstBufferFlag 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_DATA:
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* @buf: a #GstBuffer.
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*
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* A pointer to the data element of this buffer.
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*/
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#define GST_BUFFER_DATA(buf) (GST_BUFFER_CAST(buf)->data)
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/**
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* GST_BUFFER_SIZE:
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* @buf: a #GstBuffer.
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*
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* The size in bytes of the data in this buffer.
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*/
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#define GST_BUFFER_SIZE(buf) (GST_BUFFER_CAST(buf)->size)
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/**
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* GST_BUFFER_TIMESTAMP:
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* @buf: a #GstBuffer.:
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*
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* The timestamp in nanoseconds (as a #GstClockTime) of the data in the buffer.
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* Value will be %GST_CLOCK_TIME_NONE if the timestamp is unknown.
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*
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*/
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#define GST_BUFFER_TIMESTAMP(buf) (GST_BUFFER_CAST(buf)->timestamp)
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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_CAPS:
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* @buf: a #GstBuffer.
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*
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* The caps for this buffer.
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*/
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#define GST_BUFFER_CAPS(buf) (GST_BUFFER_CAST(buf)->caps)
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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_MALLOCDATA:
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* @buf: a #GstBuffer.
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*
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* A pointer to any data allocated for this buffer using g_malloc(). If this is
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* non-NULL, this memory will be freed at the end of the buffer's lifecycle
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* (i.e. when its refcount becomes zero).
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*/
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#define GST_BUFFER_MALLOCDATA(buf) (GST_BUFFER_CAST(buf)->malloc_data)
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/**
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* GST_BUFFER_FREE_FUNC:
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* @buf: a #GstBuffer.
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*
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* A pointer to a function that will be called on the buffer's malloc_data when
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* this buffer is finalized. Defaults to g_free().
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*
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* Note that the free function only affects the buffer's malloc_data; if the
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* buffer's malloc_data is %NULL, the function will not be called.
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*
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* Since: 0.10.22
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*/
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#define GST_BUFFER_FREE_FUNC(buf) (GST_BUFFER_CAST(buf)->free_func)
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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_TIMESTAMP_IS_VALID:
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* @buffer: a #GstBuffer
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*
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* Tests if the timestamp is known.
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*/
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#define GST_BUFFER_TIMESTAMP_IS_VALID(buffer) (GST_CLOCK_TIME_IS_VALID (GST_BUFFER_TIMESTAMP (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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* Since: 0.10.9
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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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* GstBufferFlag:
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* @GST_BUFFER_FLAG_READONLY: the buffer is read-only. This means the data of
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* the buffer should not be modified. The metadata might still be modified.
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* @GST_BUFFER_FLAG_PREROLL: the buffer is part of a preroll and should not be
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* displayed.
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* @GST_BUFFER_FLAG_DISCONT: the buffer marks a discontinuity in the stream.
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* This typically occurs after a seek or a dropped buffer from a live or
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* network source.
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* @GST_BUFFER_FLAG_IN_CAPS: the buffer has been added as a field in a #GstCaps.
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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 switch to optimized code
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* path that ignores the buffer content).
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* @GST_BUFFER_FLAG_DELTA_UNIT: this unit cannot be decoded independently.
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* @GST_BUFFER_FLAG_MEDIA1: a flag whose use is specific to the caps of the buffer. Since: 0.10.23.
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* @GST_BUFFER_FLAG_MEDIA2: a flag whose use is specific to the caps of the buffer. Since: 0.10.23.
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* @GST_BUFFER_FLAG_MEDIA3: a flag whose use is specific to the caps of the buffer. Since: 0.10.23.
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* @GST_BUFFER_FLAG_MEDIA4: a flag whose use is specific to the caps of the buffer. Since: 0.10.33.
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* @GST_BUFFER_FLAG_LAST: additional flags can be added starting from 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_READONLY = GST_MINI_OBJECT_FLAG_READONLY,
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GST_BUFFER_FLAG_PREROLL = (GST_MINI_OBJECT_FLAG_LAST << 0),
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GST_BUFFER_FLAG_DISCONT = (GST_MINI_OBJECT_FLAG_LAST << 1),
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GST_BUFFER_FLAG_IN_CAPS = (GST_MINI_OBJECT_FLAG_LAST << 2),
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GST_BUFFER_FLAG_GAP = (GST_MINI_OBJECT_FLAG_LAST << 3),
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GST_BUFFER_FLAG_DELTA_UNIT = (GST_MINI_OBJECT_FLAG_LAST << 4),
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GST_BUFFER_FLAG_MEDIA1 = (GST_MINI_OBJECT_FLAG_LAST << 5),
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GST_BUFFER_FLAG_MEDIA2 = (GST_MINI_OBJECT_FLAG_LAST << 6),
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GST_BUFFER_FLAG_MEDIA3 = (GST_MINI_OBJECT_FLAG_LAST << 7),
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GST_BUFFER_FLAG_MEDIA4 = (GST_MINI_OBJECT_FLAG_LAST << 8),
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GST_BUFFER_FLAG_LAST = (GST_MINI_OBJECT_FLAG_LAST << 16)
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} GstBufferFlag;
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/**
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* GstBuffer:
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* @mini_object: the parent structure
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* @data: pointer to the buffer data
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* @size: size of buffer data
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* @timestamp: timestamp of the buffer, can be #GST_CLOCK_TIME_NONE when the
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* timestamp is not known or relevant.
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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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* @caps: the #GstCaps describing the data format in this buffer
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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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* @malloc_data: a pointer to the allocated memory associated with this buffer.
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* When the buffer is freed, this data will freed with @free_func.
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* @free_func: a custom function that will be called with @malloc_data, defaults
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* to g_free(). Since 0.10.22.
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* @parent: the parent buffer if this is a subbuffer. Since 0.10.26.
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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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/* pointer to data and its size */
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guint8 *data;
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guint size;
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/* timestamp */
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GstClockTime timestamp;
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GstClockTime duration;
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/* the media type of this buffer */
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GstCaps *caps;
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/* media specific offset */
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guint64 offset;
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guint64 offset_end;
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guint8 *malloc_data;
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/* ABI Added */
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GFreeFunc free_func;
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GstBuffer *parent;
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gpointer priv;
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gpointer owner_priv;
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};
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/* allocation */
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GstBuffer * gst_buffer_new (void);
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GstBuffer * gst_buffer_new_and_alloc (guint size);
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GstBuffer * gst_buffer_try_new_and_alloc (guint size);
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/**
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* gst_buffer_set_data:
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* @buf: a #GstBuffer
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* @data: The data (a #guint8 *) to set on the buffer.
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* @size: The size (in bytes, as a #guint) of the data being set.
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*
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* A convenience function to set the data and size on a buffer.
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* This will replace any existing data pointer set on this buffer, but will
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* not change GST_BUFFER_MALLOCDATA(), if any. Callers should ensure that
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* GST_BUFFER_MALLOCDATA() is non-NULL, or should free that and set it to NULL.
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*
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* No checks are done on the data or size arguments passed.
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*/
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#define gst_buffer_set_data(buf, data, size) \
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G_STMT_START { \
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GST_BUFFER_DATA (buf) = data; \
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GST_BUFFER_SIZE (buf) = size; \
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} G_STMT_END
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/* refcounting */
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/**
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* gst_buffer_ref:
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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 writeability
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* of @buf and its metadata, see gst_buffer_is_writable() and
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* gst_buffer_is_metadata_writable(). It is
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* 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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#ifdef _FOOL_GTK_DOC_
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G_INLINE_FUNC GstBuffer * gst_buffer_ref (GstBuffer * buf);
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#endif
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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:
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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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* will be freed. If GST_BUFFER_MALLOCDATA() is non-NULL, this pointer will
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* also be freed at this time.
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*/
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#ifdef _FOOL_GTK_DOC_
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G_INLINE_FUNC void gst_buffer_unref (GstBuffer * buf);
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#endif
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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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/* copy buffer */
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/**
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* gst_buffer_copy:
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* @buf: a #GstBuffer.
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*
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* Create a copy of the given buffer. This will also make a newly allocated
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* copy of the data the source buffer contains.
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*
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* Returns: (transfer full): a new copy of @buf.
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*/
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#ifdef _FOOL_GTK_DOC_
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G_INLINE_FUNC GstBuffer * gst_buffer_copy (const GstBuffer * buf);
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#endif
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static inline GstBuffer *
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gst_buffer_copy (const GstBuffer * buf)
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{
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return GST_BUFFER (gst_mini_object_copy (GST_MINI_OBJECT_CONST_CAST (buf)));
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}
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/**
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* GstBufferCopyFlags:
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* @GST_BUFFER_COPY_FLAGS: flag indicating that buffer flags should be copied
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* @GST_BUFFER_COPY_TIMESTAMPS: flag indicating that buffer timestamp, duration,
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* offset and offset_end should be copied
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* @GST_BUFFER_COPY_CAPS: flag indicating that buffer caps should be copied
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*
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* A set of flags that can be provided to the gst_buffer_copy_metadata()
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* function to specify which metadata fields should be copied.
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*
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* Since: 0.10.13
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*/
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typedef enum {
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GST_BUFFER_COPY_FLAGS = (1 << 0),
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GST_BUFFER_COPY_TIMESTAMPS = (1 << 1),
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GST_BUFFER_COPY_CAPS = (1 << 2)
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} GstBufferCopyFlags;
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/**
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* GST_BUFFER_COPY_ALL:
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*
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* Combination of all possible fields that can be copied with
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* gst_buffer_copy_metadata().
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*
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* Since: 0.10.13
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*/
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#define GST_BUFFER_COPY_ALL (GST_BUFFER_COPY_FLAGS | GST_BUFFER_COPY_TIMESTAMPS | GST_BUFFER_COPY_CAPS)
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/* copies metadata into newly allocated buffer */
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void gst_buffer_copy_metadata (GstBuffer *dest, const GstBuffer *src,
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GstBufferCopyFlags flags);
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/**
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* gst_buffer_is_writable:
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* @buf: a #GstBuffer
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*
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* Tests if you can safely write data into a buffer's data array or validly
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* modify the caps and timestamp metadata. Metadata in a GstBuffer is always
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* writable, but it is only safe to change it when there is only one owner
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* of the buffer - ie, the refcount is 1.
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*/
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#define gst_buffer_is_writable(buf) gst_mini_object_is_writable (GST_MINI_OBJECT_CAST (buf))
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/**
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* gst_buffer_make_writable:
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* @buf: (transfer full): a #GstBuffer
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*
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* Makes a writable buffer from the given buffer. If the source buffer is
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* already writable, this will simply return the same buffer. A copy will
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* otherwise be made using gst_buffer_copy().
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*
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* Returns: (transfer full): a writable buffer which may or may not be the
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* same as @buf
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*/
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#define gst_buffer_make_writable(buf) GST_BUFFER_CAST (gst_mini_object_make_writable (GST_MINI_OBJECT_CAST (buf)))
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/* Ensure that the metadata of the buffer is writable, even if the buffer data
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* isn't */
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gboolean gst_buffer_is_metadata_writable (GstBuffer *buf);
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GstBuffer* gst_buffer_make_metadata_writable (GstBuffer *buf);
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/**
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* gst_buffer_replace:
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* @obuf: (inout) (transfer full): pointer to a pointer to a #GstBuffer to be
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* replaced.
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* @nbuf: (transfer none) (allow-none): pointer to a #GstBuffer that will
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* replace the buffer pointed to by @obuf.
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*
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* Modifies a pointer to a #GstBuffer to point to a different #GstBuffer. The
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* modification is done atomically (so this is useful for ensuring thread safety
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* in some cases), and the reference counts are updated appropriately (the old
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* buffer is unreffed, the new is reffed).
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*
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* Either @nbuf or the #GstBuffer pointed to by @obuf may be NULL.
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*/
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#define gst_buffer_replace(obuf,nbuf) \
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G_STMT_START { \
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GstBuffer **___obufaddr = (GstBuffer **)(obuf); \
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gst_mini_object_replace ((GstMiniObject **)___obufaddr, \
|
|
GST_MINI_OBJECT_CAST (nbuf)); \
|
|
} G_STMT_END
|
|
|
|
GstCaps* gst_buffer_get_caps (GstBuffer *buffer);
|
|
void gst_buffer_set_caps (GstBuffer *buffer, GstCaps *caps);
|
|
|
|
/* creating a subbuffer */
|
|
GstBuffer* gst_buffer_create_sub (GstBuffer *parent, guint offset, guint size);
|
|
|
|
/* span, two buffers, intelligently */
|
|
gboolean gst_buffer_is_span_fast (GstBuffer *buf1, GstBuffer *buf2);
|
|
GstBuffer* gst_buffer_span (GstBuffer *buf1, guint32 offset, GstBuffer *buf2, guint32 len);
|
|
|
|
/* metadata */
|
|
#include <gst/gstbuffermeta.h>
|
|
|
|
GstBufferMeta * gst_buffer_get_meta (GstBuffer *buffer, const GstBufferMetaInfo *info,
|
|
gboolean create);
|
|
gboolean gst_buffer_remove_meta (GstBuffer *buffer, const GstBufferMetaInfo *info);
|
|
|
|
GstBufferMeta * gst_buffer_iterate_meta (GstBuffer *buffer, gpointer *state);
|
|
|
|
/**
|
|
* 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__ */
|