modules/demux/windows_audio_commons.h

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