modules/demux/mp4/coreaudio.h

   1 /*****************************************************************************
   2  * coreaudio.h : CoreAudio definitions for vlc
   3  *****************************************************************************
   4  * Copyright (C) 2014-2018 VideoLabs, VLC authors and VideoLAN
   5  *
   6  * This program is free software; you can redistribute it and/or modify it
   7  * under the terms of the GNU Lesser General Public License as published by
   8  * the Free Software Foundation; either version 2.1 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  14  * GNU Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public License
  17  * along with this program; if not, write to the Free Software Foundation,
  18  * Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
  19  *****************************************************************************/
  20 #include <vlc_aout.h>
  21
  22 /* According to Apple's CoreAudio_Bitmap/CoreAudio_BitmapTypes.h */
  23 enum
  24 {
  25     CoreAudio_Bitmap_LEFT                 = (1<<0),
  26     CoreAudio_Bitmap_RIGHT                = (1<<1),
  27     CoreAudio_Bitmap_CENTER               = (1<<2),
  28     CoreAudio_Bitmap_LFESCREEN            = (1<<3),
  29     CoreAudio_Bitmap_BACKLEFT             = (1<<4),
  30     CoreAudio_Bitmap_BACKRIGHT            = (1<<5),
  31     CoreAudio_Bitmap_LEFTCENTER           = (1<<6),
  32     CoreAudio_Bitmap_RIGHTCENTER          = (1<<7),
  33     CoreAudio_Bitmap_BACKCENTER           = (1<<8),
  34     CoreAudio_Bitmap_SIDELEFT             = (1<<9),
  35     CoreAudio_Bitmap_SIDERIGHT            = (1<<10),
  36     CoreAudio_Bitmap_TOPCENTER            = (1<<11),
  37     CoreAudio_Bitmap_TOPFRONTLEFT         = (1<<12),
  38     CoreAudio_Bitmap_TOPFRONTENTER        = (1<<13),
  39     CoreAudio_Bitmap_TOPFRONTRIGHT        = (1<<14),
  40     CoreAudio_Bitmap_TOPBACKLEFT          = (1<<15),
  41     CoreAudio_Bitmap_TOPBACKCENTER        = (1<<16),
  42     CoreAudio_Bitmap_TOPBACKRIGHT         = (1<<17),
  43 };
  44
  45 static const uint32_t pi_vlc_chan_order_CoreAudio[] =
  46 {
  47     AOUT_CHAN_LEFT, AOUT_CHAN_RIGHT, AOUT_CHAN_CENTER,
  48     AOUT_CHAN_LFE,
  49     AOUT_CHAN_REARLEFT, AOUT_CHAN_REARRIGHT,
  50     AOUT_CHAN_LEFT, AOUT_CHAN_RIGHT, AOUT_CHAN_REARCENTER,
  51     AOUT_CHAN_MIDDLELEFT, AOUT_CHAN_MIDDLERIGHT,
  52     0
  53 };
  54
  55 static const struct
  56 {
  57     uint32_t i_bitmap;
  58     uint32_t i_vlc_bitmap;
  59 } CoreAudio_Bitmap_mapping[] = {
  60     { CoreAudio_Bitmap_LEFT,         AOUT_CHAN_LEFT },
  61     { CoreAudio_Bitmap_RIGHT,        AOUT_CHAN_RIGHT },
  62     { CoreAudio_Bitmap_CENTER,       AOUT_CHAN_CENTER },
  63     { CoreAudio_Bitmap_LFESCREEN,    AOUT_CHAN_LFE },
  64     { CoreAudio_Bitmap_BACKLEFT,     AOUT_CHAN_REARLEFT },
  65     { CoreAudio_Bitmap_BACKRIGHT,    AOUT_CHAN_REARRIGHT },
  66     { CoreAudio_Bitmap_LEFTCENTER,   AOUT_CHAN_MIDDLELEFT },
  67     { CoreAudio_Bitmap_RIGHTCENTER,  AOUT_CHAN_MIDDLERIGHT },
  68     { CoreAudio_Bitmap_BACKCENTER,   AOUT_CHAN_REARCENTER },
  69     { CoreAudio_Bitmap_SIDELEFT,     AOUT_CHAN_LEFT },
  70     { CoreAudio_Bitmap_SIDERIGHT,    AOUT_CHAN_RIGHT },
  71     { CoreAudio_Bitmap_TOPCENTER,    AOUT_CHAN_CENTER },
  72     { CoreAudio_Bitmap_TOPFRONTLEFT, AOUT_CHAN_LEFT },
  73     { CoreAudio_Bitmap_TOPFRONTENTER,AOUT_CHAN_CENTER },
  74     { CoreAudio_Bitmap_TOPFRONTRIGHT,AOUT_CHAN_RIGHT },
  75     { CoreAudio_Bitmap_TOPBACKLEFT,  AOUT_CHAN_REARLEFT },
  76     { CoreAudio_Bitmap_TOPBACKCENTER,AOUT_CHAN_REARCENTER },
  77     { CoreAudio_Bitmap_TOPBACKRIGHT, AOUT_CHAN_REARRIGHT },
  78 };
  79
  80 enum CoreAudio_Layout
  81 {
  82     CoreAudio_Layout_DESC                 = 0,
  83     CoreAudio_Layout_BITMAP               = (1<<16),
  84 };
  85
  86 static inline int CoreAudio_Bitmap_to_vlc_bitmap( uint32_t i_corebitmap,
  87                                                   uint16_t *pi_mapping,
  88                                                   uint8_t *pi_channels,
  89                                                   const uint32_t **pp_chans_order )
  90 {
  91     *pp_chans_order = pi_vlc_chan_order_CoreAudio;
  92     *pi_mapping = 0;
  93     *pi_channels = 0;
  94     for (uint8_t i=0;i<ARRAY_SIZE(CoreAudio_Bitmap_mapping);i++)
  95     {
  96         if ( CoreAudio_Bitmap_mapping[i].i_bitmap & i_corebitmap )
  97         {
  98             if ( (CoreAudio_Bitmap_mapping[i].i_vlc_bitmap & *pi_mapping) ||
  99                  *pi_channels >= AOUT_CHAN_MAX )
 100             {
 101                 /* double mapping or unsupported number of channels */
 102                 *pi_mapping = 0;
 103                 *pi_channels = 0;
 104                 return VLC_EGENERIC;
 105             }
 106             *pi_mapping |= CoreAudio_Bitmap_mapping[i].i_vlc_bitmap;
 107         }
 108     }
 109     return VLC_SUCCESS;
 110 }