code.delx.au - pulseaudio/blob - src/pulsecore/stream-util.c

   1 /***
   2   This file is part of PulseAudio.
   3
   4   Copyright 2013 Intel Corporation
   5
   6   PulseAudio is free software; you can redistribute it and/or modify
   7   it under the terms of the GNU Lesser General Public License as published
   8   by the Free Software Foundation; either version 2.1 of the License,
   9   or (at your option) any later version.
  10
  11   PulseAudio is distributed in the hope that it will be useful, but
  12   WITHOUT ANY WARRANTY; without even the implied warranty of
  13   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  14   General Public License for more details.
  15
  16   You should have received a copy of the GNU Lesser General Public License
  17   along with PulseAudio; if not, write to the Free Software
  18   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
  19   USA.
  20 ***/
  21
  22 #ifdef HAVE_CONFIG_H
  23 #include <config.h>
  24 #endif
  25
  26 #include "stream-util.h"
  27
  28 #include <pulse/def.h>
  29
  30 #include <pulsecore/core-format.h>
  31 #include <pulsecore/macro.h>
  32
  33 int pa_stream_get_volume_channel_map(const pa_cvolume *volume, const pa_channel_map *original_map, const pa_format_info *format,
  34                                      pa_channel_map *volume_map) {
  35     int r;
  36     pa_channel_map volume_map_local;
  37
  38     pa_assert(volume);
  39     pa_assert(format);
  40     pa_assert(volume_map);
  41
  42     if (original_map) {
  43         if (volume->channels == original_map->channels) {
  44             *volume_map = *original_map;
  45             return 0;
  46         }
  47
  48         if (volume->channels == 1) {
  49             pa_channel_map_init_mono(volume_map);
  50             return 0;
  51         }
  52
  53         pa_log_info("Invalid stream parameters: the volume is incompatible with the channel map.");
  54         return -PA_ERR_INVALID;
  55     }
  56
  57     r = pa_format_info_get_channel_map(format, &volume_map_local);
  58     if (r == -PA_ERR_NOENTITY) {
  59         if (volume->channels == 1) {
  60             pa_channel_map_init_mono(volume_map);
  61             return 0;
  62         }
  63
  64         pa_log_info("Invalid stream parameters: multi-channel volume is set, but channel map is not.");
  65         return -PA_ERR_INVALID;
  66     }
  67
  68     if (r < 0) {
  69         pa_log_info("Invalid channel map.");
  70         return -PA_ERR_INVALID;
  71     }
  72
  73     if (volume->channels == volume_map_local.channels) {
  74         *volume_map = volume_map_local;
  75         return 0;
  76     }
  77
  78     if (volume->channels == 1) {
  79         pa_channel_map_init_mono(volume_map);
  80         return 0;
  81     }
  82
  83     pa_log_info("Invalid stream parameters: the volume is incompatible with the channel map.");
  84
  85     return -PA_ERR_INVALID;
  86 }