88 lines
2.1 KiB
C++
88 lines
2.1 KiB
C++
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// AItem.cc, Petr Hlavka, 2004
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#include "AItem.h"
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#include "AMixer.h"
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#include <alsa/asoundlib.h>
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#include <vector>
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#define ROUND_POS(x) (long ((long (x) + 0.5 > (x)) ? (x) : (x) + 1))
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// load only playback channels, don't care about common items
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AItem::AItem(AMixer *m, snd_mixer_elem_t *e) {
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mixer = m;
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aElem = e;
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name = snd_mixer_selem_get_name(aElem);
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hPVolume = snd_mixer_selem_has_playback_volume(aElem);
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hPSwitch = snd_mixer_selem_has_playback_switch(aElem);
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if (hPVolume)
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snd_mixer_selem_get_playback_volume_range(aElem, &minPVolume, &maxPVolume);
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else
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minPVolume = maxPVolume = 0;
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for (int channel = 0; channel <= (int) SND_MIXER_SCHN_LAST; channel++) {
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if (snd_mixer_selem_has_playback_channel(aElem, (SNDCHID_T) channel)) {
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AChannel *ch = new AChannel(this, (SNDCHID_T) channel);
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pbChannels.push_back(ch);
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}
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}
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}
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AItem::~AItem() {
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for (unsigned int i = 0; i < pbChannels.size(); i++)
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delete pbChannels[i];
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}
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// set same volume for all channels in this item in percent
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void AItem::setVolumePerc(unsigned int percent) {
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if (percent > 100)
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percent = 100;
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snd_mixer_selem_set_playback_volume_all(aElem, (long) ROUND_POS((minPVolume + (maxPVolume - minPVolume) * percent / 100.0)));
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}
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// get max channel volume of all channels in this item in percent
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unsigned int AItem::getVolumePerc() {
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long max_vol = 0, act_vol;
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// find the max volume
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for (unsigned int i = 0; i < pbChannels.size(); i++)
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if ((act_vol = pbChannels[i]->getVolume()) > max_vol)
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max_vol = act_vol;
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// convert it into percent
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if (minPVolume != maxPVolume)
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return ((unsigned int) ROUND_POS((max_vol - minPVolume) * 100.0 / (maxPVolume - minPVolume)));
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else
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return (0);
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}
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// in this app side of view, item is muted if all channels is muted
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bool AItem::isMuted() {
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for (unsigned int i = 0; i < pbChannels.size(); i++)
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if (!pbChannels[i]->isMuted())
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return (false);
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return (true);
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}
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// mute all channels
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void AItem::mute() {
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snd_mixer_selem_set_playback_switch_all(aElem, false);
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}
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// unmute all channels
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void AItem::unmute() {
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snd_mixer_selem_set_playback_switch_all(aElem, true);
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}
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