64 lines
2.0 KiB
C
64 lines
2.0 KiB
C
/*
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* Copyright 2011-2013 Various Authors
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* Copyright 2011 Johannes Weißl
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of the
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* License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* 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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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, see <http://www.gnu.org/licenses/>.
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*/
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#include "channelmap.h"
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#include "utils.h"
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void channel_map_init_waveex(int channels, unsigned int mask, channel_position_t *map)
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{
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/* http://www.microsoft.com/whdc/device/audio/multichaud.mspx#EMLAC */
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const channel_position_t channel_map_waveex[] = {
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CHANNEL_POSITION_FRONT_LEFT,
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CHANNEL_POSITION_FRONT_RIGHT,
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CHANNEL_POSITION_FRONT_CENTER,
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CHANNEL_POSITION_LFE,
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CHANNEL_POSITION_REAR_LEFT,
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CHANNEL_POSITION_REAR_RIGHT,
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CHANNEL_POSITION_FRONT_LEFT_OF_CENTER,
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CHANNEL_POSITION_FRONT_RIGHT_OF_CENTER,
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CHANNEL_POSITION_REAR_CENTER,
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CHANNEL_POSITION_SIDE_LEFT,
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CHANNEL_POSITION_SIDE_RIGHT,
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CHANNEL_POSITION_TOP_CENTER,
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CHANNEL_POSITION_TOP_FRONT_LEFT,
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CHANNEL_POSITION_TOP_FRONT_CENTER,
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CHANNEL_POSITION_TOP_FRONT_RIGHT,
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CHANNEL_POSITION_TOP_REAR_LEFT,
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CHANNEL_POSITION_TOP_REAR_CENTER,
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CHANNEL_POSITION_TOP_REAR_RIGHT
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};
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if (channels == 1) {
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map[0] = CHANNEL_POSITION_MONO;
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} else if (channels > 1 && channels < N_ELEMENTS(channel_map_waveex)) {
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int i, j = 0;
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if (!mask)
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mask = (1 << channels) - 1;
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for (i = 0; i < N_ELEMENTS(channel_map_waveex); i++) {
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if (mask & (1 << i))
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map[j++] = channel_map_waveex[i];
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}
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if (j != channels)
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map[0] = CHANNEL_POSITION_INVALID;
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} else {
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map[0] = CHANNEL_POSITION_INVALID;
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}
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}
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