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110 lines
3.8 KiB
C
110 lines
3.8 KiB
C
/* GStreamer Jack utility functions
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* Copyright (C) 2010 Tristan Matthews <tristan@sat.qc.ca>
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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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#include "gstjackutil.h"
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#include <gst/audio/audio.h>
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static const GstAudioChannelPosition default_positions[8][8] = {
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/* 1 channel */
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{
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GST_AUDIO_CHANNEL_POSITION_MONO,
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},
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/* 2 channels */
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{
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GST_AUDIO_CHANNEL_POSITION_FRONT_LEFT,
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GST_AUDIO_CHANNEL_POSITION_FRONT_RIGHT,
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},
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/* 3 channels (2.1) */
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{
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GST_AUDIO_CHANNEL_POSITION_FRONT_LEFT,
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GST_AUDIO_CHANNEL_POSITION_FRONT_RIGHT,
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GST_AUDIO_CHANNEL_POSITION_LFE1, /* or FRONT_CENTER for 3.0? */
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},
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/* 4 channels (4.0 or 3.1?) */
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{
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GST_AUDIO_CHANNEL_POSITION_FRONT_LEFT,
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GST_AUDIO_CHANNEL_POSITION_FRONT_RIGHT,
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GST_AUDIO_CHANNEL_POSITION_REAR_LEFT,
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GST_AUDIO_CHANNEL_POSITION_REAR_RIGHT,
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},
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/* 5 channels */
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{
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GST_AUDIO_CHANNEL_POSITION_FRONT_LEFT,
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GST_AUDIO_CHANNEL_POSITION_FRONT_RIGHT,
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GST_AUDIO_CHANNEL_POSITION_REAR_LEFT,
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GST_AUDIO_CHANNEL_POSITION_REAR_RIGHT,
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GST_AUDIO_CHANNEL_POSITION_FRONT_CENTER,
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},
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/* 6 channels */
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{
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GST_AUDIO_CHANNEL_POSITION_FRONT_LEFT,
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GST_AUDIO_CHANNEL_POSITION_FRONT_RIGHT,
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GST_AUDIO_CHANNEL_POSITION_REAR_LEFT,
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GST_AUDIO_CHANNEL_POSITION_REAR_RIGHT,
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GST_AUDIO_CHANNEL_POSITION_FRONT_CENTER,
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GST_AUDIO_CHANNEL_POSITION_LFE1,
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},
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/* 7 channels */
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{
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GST_AUDIO_CHANNEL_POSITION_FRONT_LEFT,
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GST_AUDIO_CHANNEL_POSITION_FRONT_RIGHT,
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GST_AUDIO_CHANNEL_POSITION_REAR_LEFT,
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GST_AUDIO_CHANNEL_POSITION_REAR_RIGHT,
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GST_AUDIO_CHANNEL_POSITION_FRONT_CENTER,
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GST_AUDIO_CHANNEL_POSITION_LFE1,
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GST_AUDIO_CHANNEL_POSITION_REAR_CENTER,
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},
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/* 8 channels */
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{
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GST_AUDIO_CHANNEL_POSITION_FRONT_LEFT,
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GST_AUDIO_CHANNEL_POSITION_FRONT_RIGHT,
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GST_AUDIO_CHANNEL_POSITION_REAR_LEFT,
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GST_AUDIO_CHANNEL_POSITION_REAR_RIGHT,
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GST_AUDIO_CHANNEL_POSITION_FRONT_CENTER,
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GST_AUDIO_CHANNEL_POSITION_LFE1,
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GST_AUDIO_CHANNEL_POSITION_SIDE_LEFT,
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GST_AUDIO_CHANNEL_POSITION_SIDE_RIGHT,
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}
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};
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/* if channels are less than or equal to 8, we set a default layout,
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* otherwise set layout to an array of GST_AUDIO_CHANNEL_POSITION_NONE */
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void
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gst_jack_set_layout (GstAudioRingBuffer * buffer, GstAudioRingBufferSpec * spec)
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{
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gint i;
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if (spec->info.channels <= 8) {
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for (i = 0; i < spec->info.channels; i++)
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spec->info.position[i] = default_positions[spec->info.channels - 1][i];
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gst_audio_channel_positions_to_valid_order (spec->info.position,
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spec->info.channels);
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gst_audio_ring_buffer_set_channel_positions (buffer,
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default_positions[spec->info.channels - 1]);
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} else {
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spec->info.flags |= GST_AUDIO_FLAG_UNPOSITIONED;
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for (i = 0; i < G_N_ELEMENTS (spec->info.position); i++)
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spec->info.position[i] = GST_AUDIO_CHANNEL_POSITION_NONE;
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gst_audio_ring_buffer_set_channel_positions (buffer, spec->info.position);
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}
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gst_caps_unref (spec->caps);
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spec->caps = gst_audio_info_to_caps (&spec->info);
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}
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