author | Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com> |
Tue, 31 Aug 2010 15:30:33 +0300 | |
branch | RCL_3 |
changeset 7 | 567bb019e3e3 |
parent 0 | 0e761a78d257 |
child 8 | 7e817e7e631c |
permissions | -rw-r--r-- |
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/* 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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typedef struct _GstBufferClass GstBufferClass; |
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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_get_type()) |
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#define GST_IS_BUFFER(obj) (G_TYPE_CHECK_INSTANCE_TYPE ((obj), GST_TYPE_BUFFER)) |
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#define GST_IS_BUFFER_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass), GST_TYPE_BUFFER)) |
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#define GST_BUFFER_GET_CLASS(obj) (G_TYPE_INSTANCE_GET_CLASS ((obj), GST_TYPE_BUFFER, GstBufferClass)) |
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#define GST_BUFFER(obj) (G_TYPE_CHECK_INSTANCE_CAST ((obj), GST_TYPE_BUFFER, GstBuffer)) |
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#define GST_BUFFER_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST ((klass), GST_TYPE_BUFFER, GstBufferClass)) |
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#define GST_BUFFER_CAST(obj) ((GstBuffer *)(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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/** |
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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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/** |
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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. |
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* Since: 0.10.23 |
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* @GST_BUFFER_FLAG_MEDIA2: a flag whose use is specific to the caps of the buffer. |
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* Since: 0.10.23 |
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* @GST_BUFFER_FLAG_MEDIA3: a flag whose use is specific to the caps of the buffer. |
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* Since: 0.10.23 |
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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_LAST = (GST_MINI_OBJECT_FLAG_LAST << 8) |
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} GstBufferFlag; |
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|
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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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* |
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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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|
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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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|
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/* timestamp */ |
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GstClockTime timestamp; |
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GstClockTime duration; |
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|
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/* the media type of this buffer */ |
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GstCaps *caps; |
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|
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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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guint8 *malloc_data; |
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|
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GFreeFunc free_func; |
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|
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/*< private >*/ |
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gpointer _gst_reserved[GST_PADDING - 1]; |
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}; |
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|
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struct _GstBufferClass { |
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GstMiniObjectClass mini_object_class; |
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}; |
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#ifdef __SYMBIAN32__ |
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IMPORT_C |
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#endif |
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|
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|
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GType gst_buffer_get_type (void); |
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|
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/* allocation */ |
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#ifdef __SYMBIAN32__ |
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IMPORT_C |
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#endif |
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|
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GstBuffer * gst_buffer_new (void); |
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#ifdef __SYMBIAN32__ |
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IMPORT_C |
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#endif |
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|
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GstBuffer * gst_buffer_new_and_alloc (guint size); |
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#ifdef __SYMBIAN32__ |
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IMPORT_C |
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#endif |
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|
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GstBuffer * gst_buffer_try_new_and_alloc (guint size); |
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|
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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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|
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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: @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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|
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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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/** |
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* gst_buffer_unref: |
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* @buf: 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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|
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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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|
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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: 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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|
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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_CAST (buf))); |
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} |
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|
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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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408 |
* @GST_BUFFER_COPY_CAPS: flag indicating that buffer caps should be copied |
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409 |
* |
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410 |
* A set of flags that can be provided to the gst_buffer_copy_metadata() |
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411 |
* function to specify which metadata fields should be copied. |
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412 |
* |
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413 |
* Since: 0.10.13 |
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414 |
*/ |
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415 |
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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418 |
GST_BUFFER_COPY_CAPS = (1 << 2) |
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419 |
} GstBufferCopyFlags; |
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420 |
|
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421 |
/** |
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422 |
* GST_BUFFER_COPY_ALL: |
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423 |
* |
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424 |
* Combination of all possible fields that can be copied with |
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* gst_buffer_copy_metadata(). |
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426 |
* |
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427 |
* Since: 0.10.13 |
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428 |
*/ |
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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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430 |
|
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431 |
/* copies metadata into newly allocated buffer */ |
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#ifdef __SYMBIAN32__ |
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433 |
IMPORT_C |
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434 |
#endif |
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435 |
|
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436 |
void gst_buffer_copy_metadata (GstBuffer *dest, const GstBuffer *src, |
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GstBufferCopyFlags flags); |
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438 |
|
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439 |
/** |
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* gst_buffer_is_writable: |
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* @buf: a #GstBuffer |
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442 |
* |
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443 |
* 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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445 |
* 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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447 |
*/ |
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#define gst_buffer_is_writable(buf) gst_mini_object_is_writable (GST_MINI_OBJECT_CAST (buf)) |
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449 |
/** |
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450 |
* gst_buffer_make_writable: |
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451 |
* @buf: a #GstBuffer |
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452 |
* |
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453 |
* 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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456 |
*/ |
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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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458 |
|
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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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461 |
#ifdef __SYMBIAN32__ |
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462 |
IMPORT_C |
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463 |
#endif |
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464 |
|
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gboolean gst_buffer_is_metadata_writable (GstBuffer *buf); |
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466 |
#ifdef __SYMBIAN32__ |
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467 |
IMPORT_C |
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468 |
#endif |
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469 |
|
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470 |
GstBuffer* gst_buffer_make_metadata_writable (GstBuffer *buf); |
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471 |
|
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472 |
/** |
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473 |
* gst_buffer_replace: |
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* @obuf: pointer to a pointer to a #GstBuffer to be replaced. |
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* @nbuf: pointer to a #GstBuffer that will replace the buffer pointed to by |
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* @obuf. |
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477 |
* |
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478 |
* Modifies a pointer to a #Gstbuffer to point to a different #GstBuffer. The |
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479 |
* modification is done atomically (so this is useful for ensuring thread safety |
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480 |
* in some cases), and the reference counts are updated appropriately (the old |
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481 |
* buffer is unreffed, the new is reffed). |
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482 |
* |
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* Either @nbuf or the #GstBuffer pointed to by @obuf may be NULL. |
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484 |
*/ |
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485 |
#define gst_buffer_replace(obuf,nbuf) \ |
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486 |
G_STMT_START { \ |
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GstBuffer **___obufaddr = (GstBuffer **)(obuf); \ |
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gst_mini_object_replace ((GstMiniObject **)___obufaddr, \ |
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489 |
GST_MINI_OBJECT_CAST (nbuf)); \ |
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490 |
} G_STMT_END |
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491 |
#ifdef __SYMBIAN32__ |
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492 |
IMPORT_C |
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493 |
#endif |
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494 |
|
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495 |
|
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496 |
GstCaps* gst_buffer_get_caps (GstBuffer *buffer); |
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497 |
#ifdef __SYMBIAN32__ |
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498 |
IMPORT_C |
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499 |
#endif |
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500 |
|
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501 |
void gst_buffer_set_caps (GstBuffer *buffer, GstCaps *caps); |
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502 |
|
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503 |
/* creating a subbuffer */ |
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504 |
#ifdef __SYMBIAN32__ |
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505 |
IMPORT_C |
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506 |
#endif |
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507 |
|
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508 |
GstBuffer* gst_buffer_create_sub (GstBuffer *parent, guint offset, guint size); |
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|
509 |
|
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510 |
/* span, two buffers, intelligently */ |
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#ifdef __SYMBIAN32__ |
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IMPORT_C |
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#endif |
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gboolean gst_buffer_is_span_fast (GstBuffer *buf1, GstBuffer *buf2); |
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#ifdef __SYMBIAN32__ |
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IMPORT_C |
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#endif |
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|
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GstBuffer* gst_buffer_span (GstBuffer *buf1, guint32 offset, GstBuffer *buf2, guint32 len); |
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|
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/** |
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* gst_value_set_buffer: |
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* @v: a #GstValue to receive the data |
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* @b: a #GstBuffer to assign to the GstValue |
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* |
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* Sets @b as the value of @v. Caller retains reference to buffer. |
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*/ |
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#define gst_value_set_buffer(v,b) gst_value_set_mini_object(v, GST_MINI_OBJECT_CAST(b)) |
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/** |
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* gst_value_take_buffer: |
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* @v: a #GstValue to receive the data |
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* @b: a #GstBuffer to assign to the GstValue |
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* |
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* Sets @b as the value of @v. Caller gives away reference to buffer. |
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*/ |
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#define gst_value_take_buffer(v,b) gst_value_take_mini_object(v, GST_MINI_OBJECT_CAST(b)) |
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/** |
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* gst_value_get_buffer: |
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* @v: a #GstValue to qeury |
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* |
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* Receives a #GstBuffer as the value of @v. Does not return a reference to |
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* the buffer, so the pointer is only valid for as long as the caller owns |
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* a reference to @v. |
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*/ |
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#define gst_value_get_buffer(v) GST_BUFFER_CAST (gst_value_get_mini_object(v)) |
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|
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G_END_DECLS |
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|
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#endif /* __GST_BUFFER_H__ */ |