AlsaMixer.app/AMixer/AItem.cc

   1 // AItem.cc
   2 //
   3 // Copyright (C) 2004, Petr Hlavka
   4 //
   5 // SPDX-License-Identifier: GPL-2.0+
   6
   7 #include "AItem.h"
   8 #include "AMixer.h"
   9
  10 #include <alsa/asoundlib.h>
  11 #include <vector>
  12
  13 #define ROUND_POS(x)    (long ((long (x) + 0.5 > (x)) ? (x) : (x) + 1))
  14
  15
  16 // load only playback channels, don't care about common items
  17 AItem::AItem(AMixer *m, snd_mixer_elem_t *e) {
  18   mixer = m;
  19   aElem = e;
  20
  21   name = snd_mixer_selem_get_name(aElem);
  22
  23   hPVolume = snd_mixer_selem_has_playback_volume(aElem);
  24   hPSwitch = snd_mixer_selem_has_playback_switch(aElem);
  25
  26   if (hPVolume)
  27     snd_mixer_selem_get_playback_volume_range(aElem, &minPVolume, &maxPVolume);
  28   else
  29     minPVolume = maxPVolume = 0;
  30
  31   for (int channel = 0; channel <= (int) SND_MIXER_SCHN_LAST; channel++) {
  32     if (snd_mixer_selem_has_playback_channel(aElem, (SNDCHID_T) channel)) {
  33       AChannel *ch = new AChannel(this, (SNDCHID_T) channel);
  34       pbChannels.push_back(ch);
  35     }
  36   }
  37 }
  38
  39
  40 AItem::~AItem() {
  41   for (unsigned int i = 0; i < pbChannels.size(); i++)
  42     delete pbChannels[i];
  43 }
  44
  45
  46 // set same volume for all channels in this item in percent
  47 void AItem::setVolumePerc(unsigned int percent) {
  48   if (percent > 100)
  49     percent = 100;
  50
  51   snd_mixer_selem_set_playback_volume_all(aElem, (long) ROUND_POS((minPVolume + (maxPVolume - minPVolume) * percent / 100.0)));
  52 }
  53
  54
  55 // get max channel volume of all channels in this item in percent
  56 unsigned int AItem::getVolumePerc() {
  57   long max_vol = 0, act_vol;
  58
  59   // find the max volume
  60   for (unsigned int i = 0; i < pbChannels.size(); i++)
  61     if ((act_vol = pbChannels[i]->getVolume()) > max_vol)
  62       max_vol = act_vol;
  63
  64   // convert it into percent
  65   if (minPVolume != maxPVolume)
  66     return ((unsigned int) ROUND_POS((max_vol - minPVolume) * 100.0 / (maxPVolume - minPVolume)));
  67   else
  68     return (0);
  69 }
  70
  71
  72 // in this app side of view, item is muted if all channels is muted
  73 bool AItem::isMuted() {
  74   for (unsigned int i = 0; i < pbChannels.size(); i++)
  75     if (!pbChannels[i]->isMuted())
  76       return (false);
  77
  78   return (true);
  79 }
  80
  81
  82 // mute all channels
  83 void AItem::mute() {
  84   snd_mixer_selem_set_playback_switch_all(aElem, false);
  85 }
  86
  87
  88 // unmute all channels
  89 void AItem::unmute() {
  90   snd_mixer_selem_set_playback_switch_all(aElem, true);
  91 }