gstreamer/gst/interleave/interleave.h
Antonio Ospite 7ae7f657fa interleave: interleave samples following the Default Channel Ordering
In order to have a full mapping between channel positions in the audio
stream and loudspeaker positions, the channel-mask alone is not enough:
the channels must be interleaved following some Default Channel Ordering
as mentioned in the WAVEFORMATEXTENSIBLE[1] specification.

As a Default Channel Ordering use the one implied by
GstAudioChannelPosition which follows the ordering defined in SMPTE
2036-2-2008[2].

NOTE that the relative order in the Top Layer is not exactly the same as
the one from the WAVEFORMATEXTENSIBLE[1] specification; let's hope users
using so may channels are already aware of such discrepancies.

[1] http://msdn.microsoft.com/en-us/library/windows/hardware/dn653308%28v=vs.85%29.aspx
[2] http://www.itu.int/dms_pub/itu-r/opb/rep/R-REP-BS.2159-2-2011-PDF-E.pdf

Fixes: https://bugzilla.gnome.org/show_bug.cgi?id=737127
2014-10-02 10:21:26 +03:00

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2.7 KiB
C

/* GStreamer
* Copyright (C) 1999,2000 Erik Walthinsen <omega@cse.ogi.edu>
* 2000 Wim Taymans <wtay@chello.be>
* 2005 Wim Taymans <wim@fluendo.com>
* 2007 Andy Wingo <wingo at pobox.com>
* 2008 Sebastian Dröge <slomo@circular-chaos.org>
*
* interleave.c: interleave samples, mostly based on adder
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
#ifndef __INTERLEAVE_H__
#define __INTERLEAVE_H__
#include <gst/gst.h>
#include <gst/base/gstcollectpads.h>
G_BEGIN_DECLS
#define GST_TYPE_INTERLEAVE (gst_interleave_get_type())
#define GST_INTERLEAVE(obj) (G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_INTERLEAVE,GstInterleave))
#define GST_INTERLEAVE_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_INTERLEAVE,GstInterleaveClass))
#define GST_INTERLEAVE_GET_CLASS(obj) \
(G_TYPE_INSTANCE_GET_CLASS ((obj),GST_TYPE_INTERLEAVE,GstInterleaveClass))
#define GST_IS_INTERLEAVE(obj) (G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_INTERLEAVE))
#define GST_IS_INTERLEAVE_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_INTERLEAVE))
typedef struct _GstInterleave GstInterleave;
typedef struct _GstInterleaveClass GstInterleaveClass;
typedef void (*GstInterleaveFunc) (gpointer out, gpointer in, guint stride, guint nframes);
struct _GstInterleave
{
GstElement element;
/*< private >*/
GstCollectPads *collect;
gint channels;
gint padcounter;
gint rate;
gint width;
GValueArray *channel_positions;
GValueArray *input_channel_positions;
gboolean channel_positions_from_input;
gint default_channels_ordering_map[64];
GstCaps *sinkcaps;
gint configured_sinkpads_counter;
GstClockTime timestamp;
guint64 offset;
GstEvent *pending_segment;
GstPadEventFunction collect_event;
GstInterleaveFunc func;
GstPad *src;
gboolean send_stream_start;
};
struct _GstInterleaveClass
{
GstElementClass parent_class;
};
GType gst_interleave_get_type (void);
G_END_DECLS
#endif /* __INTERLEAVE_H__ */