Method init

src/VolumeControl.cpp:67–209

}

void VolumeControl::init()
{
	//initialize audio mixer interface
#if defined (__APPLE__)
	#error TODO: Not implemented for MacOS yet!!!
#elif defined(__linux__)
	//try to open mixer device
	if (mixerHandle == nullptr)
	{
		snd_mixer_selem_id_alloca(&mixerSelemId);
		//sets simple-mixer index and name
		snd_mixer_selem_id_set_index(mixerSelemId, mixerIndex);
		snd_mixer_selem_id_set_name(mixerSelemId, mixerName);
		//open mixer
		if (snd_mixer_open(&mixerHandle, 0) >= 0)
		{
			LOG(LogDebug) << "VolumeControl::init() - Opened ALSA mixer";
			//ok. attach to defualt card
			if (snd_mixer_attach(mixerHandle, mixerCard) >= 0)
			{
				LOG(LogDebug) << "VolumeControl::init() - Attached to default card";
				//ok. register simple element class
				if (snd_mixer_selem_register(mixerHandle, NULL, NULL) >= 0)
				{
					LOG(LogDebug) << "VolumeControl::init() - Registered simple element class";
					//ok. load registered elements
					if (snd_mixer_load(mixerHandle) >= 0)
					{
						LOG(LogDebug) << "VolumeControl::init() - Loaded mixer elements";
						//ok. find elements now
						mixerElem = snd_mixer_find_selem(mixerHandle, mixerSelemId);
						if (mixerElem != nullptr)
						{
							//wohoo. good to go...
							LOG(LogDebug) << "VolumeControl::init() - Mixer initialized";
						}
						else
						{
							LOG(LogError) << "VolumeControl::init() - Failed to find mixer elements!";
							snd_mixer_close(mixerHandle);
							mixerHandle = nullptr;
						}
					}
					else
					{
						LOG(LogError) << "VolumeControl::init() - Failed to load mixer elements!";
						snd_mixer_close(mixerHandle);
						mixerHandle = nullptr;
					}
				}
				else
				{
					LOG(LogError) << "VolumeControl::init() - Failed to register simple element class!";
					snd_mixer_close(mixerHandle);
					mixerHandle = nullptr;
				}
			}
			else