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114 lines
3.8 KiB
C
114 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/multichannel.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_FRONT_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_LFE, /* 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_LFE,
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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_LFE,
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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_LFE,
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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_on_caps (GstCaps ** caps, gint channels)
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{
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int c;
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GValue pos = { 0 };
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GValue chanpos = { 0 };
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gst_caps_unref (*caps);
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if (channels <= 8) {
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g_assert (channels >= 1);
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gst_audio_set_channel_positions (gst_caps_get_structure (*caps, 0),
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default_positions[channels - 1]);
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} else {
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g_value_init (&chanpos, GST_TYPE_ARRAY);
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g_value_init (&pos, GST_TYPE_AUDIO_CHANNEL_POSITION);
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for (c = 0; c < channels; c++) {
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g_value_set_enum (&pos, GST_AUDIO_CHANNEL_POSITION_NONE);
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gst_value_array_append_value (&chanpos, &pos);
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}
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g_value_unset (&pos);
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gst_structure_set_value (gst_caps_get_structure (*caps, 0),
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"channel-positions", &chanpos);
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g_value_unset (&chanpos);
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}
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gst_caps_ref (*caps);
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}
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