1/* GStreamer
2 * Copyright (C) 2004 Ronald Bultje <rbultje@ronald.bitfreak.net>
3 * (C) 2015 Wim Taymans <wim.taymans@gmail.com>
4 *
5 * audio-channel-mixer.h: setup of channel conversion matrices
6 *
7 * This library is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Library General Public
9 * License as published by the Free Software Foundation; either
10 * version 2 of the License, or (at your option) any later version.
11 *
12 * This library is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Library General Public License for more details.
16 *
17 * You should have received a copy of the GNU Library General Public
18 * License along with this library; if not, write to the
19 * Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
20 * Boston, MA 02110-1301, USA.
21 */
22
23#ifndef __GST_AUDIO_CHANNEL_MIXER_H__
24#define __GST_AUDIO_CHANNEL_MIXER_H__
25
26#include <gst/gst.h>
27#include <gst/audio/audio.h>
28
29typedef struct _GstAudioChannelMixer GstAudioChannelMixer;
30
31/**
32 * GstAudioChannelMixerFlags:
33 * @GST_AUDIO_CHANNEL_MIXER_FLAGS_NONE: no flag
34 * @GST_AUDIO_CHANNEL_MIXER_FLAGS_NON_INTERLEAVED_IN: input channels are not interleaved
35 * @GST_AUDIO_CHANNEL_MIXER_FLAGS_NON_INTERLEAVED_OUT: output channels are not interleaved
36 * @GST_AUDIO_CHANNEL_MIXER_FLAGS_UNPOSITIONED_IN: input channels are explicitly unpositioned
37 * @GST_AUDIO_CHANNEL_MIXER_FLAGS_UNPOSITIONED_OUT: output channels are explicitly unpositioned
38 *
39 * Flags passed to gst_audio_channel_mixer_new()
40 */
41typedef enum {
42 GST_AUDIO_CHANNEL_MIXER_FLAGS_NONE = 0,
43 GST_AUDIO_CHANNEL_MIXER_FLAGS_NON_INTERLEAVED_IN = (1 << 0),
44 GST_AUDIO_CHANNEL_MIXER_FLAGS_NON_INTERLEAVED_OUT = (1 << 1),
45 GST_AUDIO_CHANNEL_MIXER_FLAGS_UNPOSITIONED_IN = (1 << 2),
46 GST_AUDIO_CHANNEL_MIXER_FLAGS_UNPOSITIONED_OUT = (1 << 3)
47} GstAudioChannelMixerFlags;
48
49GST_AUDIO_API
50GstAudioChannelMixer * gst_audio_channel_mixer_new (GstAudioChannelMixerFlags flags,
51 GstAudioFormat format,
52 gint in_channels,
53 GstAudioChannelPosition *in_position,
54 gint out_channels,
55 GstAudioChannelPosition *out_position);
56
57GST_AUDIO_API
58GstAudioChannelMixer * gst_audio_channel_mixer_new_with_matrix (GstAudioChannelMixerFlags flags,
59 GstAudioFormat format,
60 gint in_channels,
61 gint out_channels,
62 gfloat **matrix);
63
64GST_AUDIO_API
65void gst_audio_channel_mixer_free (GstAudioChannelMixer *mix);
66
67/*
68 * Checks for passthrough (= identity matrix).
69 */
70
71GST_AUDIO_API
72gboolean gst_audio_channel_mixer_is_passthrough (GstAudioChannelMixer *mix);
73
74/*
75 * Do actual mixing.
76 */
77
78GST_AUDIO_API
79void gst_audio_channel_mixer_samples (GstAudioChannelMixer * mix,
80 const gpointer in[],
81 gpointer out[],
82 gint samples);
83
84#endif /* __GST_AUDIO_CHANNEL_MIXER_H__ */
85

source code of include/gstreamer-1.0/gst/audio/audio-channel-mixer.h