modules/demux/windows_audio_commons.h

   1 /*****************************************************************************
   2  * windows_audio_common.h: Windows Audio common code
   3  *****************************************************************************
   4  * Copyright (C) 2001-2013 VideoLAN
   5  * $Id$
   6  *
   7  * Authors: Denis Charmet <typx@videolan.org>
   8  *
   9  * This program is free software; you can redistribute it and/or modify it
  10  * under the terms of the GNU Lesser General Public License as published by
  11  * the Free Software Foundation; either version 2.1 of the License, or
  12  * (at your option) any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  17  * GNU Lesser General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU Lesser General Public License
  20  * along with this program; if not, write to the Free Software Foundation,
  21  * Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
  22  *****************************************************************************/
  23 #ifndef DMX_WINDOWS_AUDIO_COMMONS_H
  24 #define DMX_WINDOWS_AUDIO_COMMONS_H
  25
  26 #include <vlc_aout.h>
  27 #include <vlc_codecs.h>
  28
  29 static const uint32_t pi_channels_src[] = { WAVE_SPEAKER_FRONT_LEFT,
  30     WAVE_SPEAKER_FRONT_RIGHT, WAVE_SPEAKER_FRONT_CENTER,
  31     WAVE_SPEAKER_LOW_FREQUENCY, WAVE_SPEAKER_BACK_LEFT, WAVE_SPEAKER_BACK_RIGHT,
  32     WAVE_SPEAKER_BACK_CENTER, WAVE_SPEAKER_SIDE_LEFT, WAVE_SPEAKER_SIDE_RIGHT, 0 };
  33
  34 static const uint32_t pi_channels_aout[] = { AOUT_CHAN_LEFT, AOUT_CHAN_RIGHT,
  35     AOUT_CHAN_CENTER, AOUT_CHAN_LFE, AOUT_CHAN_REARLEFT, AOUT_CHAN_REARRIGHT,
  36     AOUT_CHAN_REARCENTER, AOUT_CHAN_MIDDLELEFT, AOUT_CHAN_MIDDLERIGHT, 0 };
  37
  38 static inline unsigned getChannelMask( uint32_t * wvfextChannelMask, int i_channels, int * i_match )
  39 {
  40     unsigned i_channel_mask = 0;
  41     *i_match = 0;
  42     for( unsigned i = 0;
  43          i < sizeof(pi_channels_src)/sizeof(*pi_channels_src) &&
  44          *i_match < i_channels; i++ )
  45     {
  46         if( *wvfextChannelMask & pi_channels_src[i] )
  47         {
  48             if( !( i_channel_mask & pi_channels_aout[i] ) )
  49                  *i_match += 1;
  50
  51             *wvfextChannelMask &= ~pi_channels_src[i];
  52             i_channel_mask |= pi_channels_aout[i];
  53         }
  54     }
  55     return i_channel_mask;
  56 }
  57
  58 #endif /*DMX_WINDOWS_AUDIO_COMMONS_H*/