AlsaMixer.app/AMixer/AItem.cc

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