float PORT_GetFloatValue(void* controlIDV) {
PortControl* portControl = (PortControl*) controlIDV;
float value = 0.0F;
if (portControl != NULL) {
if (portControl->controlType == CONTROL_TYPE_VOLUME) {
switch (portControl->channel) {
case CHANNELS_MONO:
value = getRealVolume(portControl, SND_MIXER_SCHN_MONO);
break;
case CHANNELS_STEREO:
value = getFakeVolume(portControl);
break;
default:
value = getRealVolume(portControl, portControl->channel);
}
} else if (portControl->controlType == CONTROL_TYPE_BALANCE) {
if (portControl->channel == CHANNELS_STEREO) {
value = getFakeBalance(portControl);
} else {
ERROR0("PORT_GetFloatValue(): Balance only allowed for stereo channels!\n");
}
} else {
ERROR1("PORT_GetFloatValue(): inappropriate control type: %s!\n",
portControl->controlType);
}
}
return value;
}
static float getFakeVolume(PortControl* portControl) {
float valueL;
float valueR;
float value;
valueL = getRealVolume(portControl, SND_MIXER_SCHN_FRONT_LEFT);
valueR = getRealVolume(portControl, SND_MIXER_SCHN_FRONT_RIGHT);
// volume is the greater value of both
value = valueL > valueR ? valueL : valueR ;
return value;
}
static float getFakeBalance(PortControl* portControl) {
float volL, volR;
// pan is the ratio of left and right
volL = getRealVolume(portControl, SND_MIXER_SCHN_FRONT_LEFT);
volR = getRealVolume(portControl, SND_MIXER_SCHN_FRONT_RIGHT);
if (volL > volR) {
return -1.0f + (volR / volL);
}
else if (volR > volL) {
return 1.0f - (volL / volR);
}
return 0.0f;
}
long SIDInfo::getVolume()
{
if (!hasVolume || !_sid || globalMax < 1) return 0;
long r = getRealVolume() - min;
return (r*globalMax/(max-min));
}
bool SIDInfo::setEmulMute(bool mute)
{
if (!hasVolume || !_sid) return false;
snd_mixer_elem_t* elem = snd_mixer_find_selem(_handle, _sid);
if (!elem) return false;
if (mute == _isEmulMuted) return true;
if (mute)
{
_isEmulMuted = true;
_lastVol = getRealVolume();
return setRealVolume(min);
}
else
{
_isEmulMuted = false;
bool ret = setRealVolume(_lastVol);
_lastVol = min;
return ret;
}
}