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◆ main openmsx / src / sound / Mixer.cc
3.7 KiB · C++ · last changed chore(): initial commit 1 month ago source blame history raw
e8555c89 Andy McCall 1 
#include "Mixer.hh"
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#include "MSXMixer.hh"
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#include "NullSoundDriver.hh"
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#include "SDLSoundDriver.hh"
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#include "CliComm.hh"
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#include "CommandController.hh"
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#include "MSXException.hh"
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#include "one_of.hh"
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#include "stl.hh"
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#include "unreachable.hh"
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#include <cassert>
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#include <memory>
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namespace openmsx {
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#ifdef _WIN32
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static constexpr int defaultSamples = 2048;
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#else
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static constexpr int defaultSamples = 1024;
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#endif
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static EnumSetting<Mixer::SoundDriverType>::Map getSoundDriverMap()
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{
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	EnumSetting<Mixer::SoundDriverType>::Map soundDriverMap = {
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		{ "null", Mixer::SoundDriverType::NONE },
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		{ "sdl",  Mixer::SoundDriverType::SDL } };
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	return soundDriverMap;
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}
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Mixer::Mixer(Reactor& reactor_, CommandController& commandController_)
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	: reactor(reactor_)
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	, commandController(commandController_)
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	, soundDriverSetting(
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		commandController, "sound_driver",
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		"select the sound output driver",
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		Mixer::SoundDriverType::SDL, getSoundDriverMap())
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	, muteSetting(
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		commandController, "mute",
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		"(un)mute the emulation sound", false, Setting::Save::NO)
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	, masterVolume(
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		commandController, "master_volume",
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		"master volume", 75, 0, 100)
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	, frequencySetting(
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		commandController, "frequency",
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		"mixer frequency", 44100, 11025, 48000)
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	, samplesSetting(
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		commandController, "samples",
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		"mixer samples", defaultSamples, 64, 8192)
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{
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	muteSetting       .attach(*this);
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	frequencySetting  .attach(*this);
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	samplesSetting    .attach(*this);
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	soundDriverSetting.attach(*this);
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	// Set correct initial mute state.
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	if (muteSetting.getBoolean()) ++muteCount;
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	assert(!driver);
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}
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Mixer::~Mixer()
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{
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	assert(msxMixers.empty());
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	driver.reset();
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	soundDriverSetting.detach(*this);
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	samplesSetting    .detach(*this);
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	frequencySetting  .detach(*this);
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	muteSetting       .detach(*this);
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}
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void Mixer::reloadDriver()
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{
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	// Destroy old driver before attempting to create a new one. Though
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	// this means we end up without driver if creating the new one failed
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	// for some reason.
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	driver = std::make_unique<NullSoundDriver>();
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	try {
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		switch (soundDriverSetting.getEnum()) {
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		case SoundDriverType::SDL:
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			driver = std::make_unique<SDLSoundDriver>(
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				reactor,
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				frequencySetting.getInt(),
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				samplesSetting.getInt());
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			break;
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		default:
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			// nothing, NullSoundDriver already created
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			break;
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		}
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	} catch (MSXException& e) {
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		commandController.getCliComm().printWarning(e.getMessage());
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	}
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}
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void Mixer::registerMixer(MSXMixer& mixer)
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{
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	assert(!contains(msxMixers, &mixer));
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	msxMixers.push_back(&mixer);
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	muteHelper();
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}
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void Mixer::unregisterMixer(MSXMixer& mixer)
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{
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	move_pop_back(msxMixers, rfind_unguarded(msxMixers, &mixer));
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	muteHelper();
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}
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void Mixer::mute()
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{
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	if (muteCount++ == 0) {
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		muteHelper();
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	}
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}
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void Mixer::unmute()
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{
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	assert(muteCount);
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	if (--muteCount == 0) {
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		muteHelper();
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	}
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}
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void Mixer::muteHelper()
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{
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	if (!driver) reloadDriver();
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	bool isMuted = muteCount || msxMixers.empty();
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	unsigned samples = isMuted ? 0 : driver->getSamples();
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	unsigned frequency = driver->getFrequency();
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	for (auto& m : msxMixers) {
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		m->setMixerParams(samples, frequency);
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	}
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	if (isMuted) {
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		driver->mute();
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	} else {
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		driver->unmute();
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	}
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}
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void Mixer::uploadBuffer(MSXMixer& /*msxMixer*/, std::span<const StereoFloat> buffer)
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{
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	if (!driver) {
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		reloadDriver();
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		muteHelper();
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	}
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	// can only handle one MSXMixer ATM
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	assert(!msxMixers.empty());
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	driver->uploadBuffer(buffer);
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}
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void Mixer::update(const Setting& setting) noexcept
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{
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	if (&setting == &muteSetting) {
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		if (muteSetting.getBoolean()) {
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			mute();
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		} else {
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			unmute();
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		}
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	} else if (&setting == one_of(&samplesSetting, &soundDriverSetting, &frequencySetting)) {
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		reloadDriver();
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		muteHelper();
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	} else {
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		UNREACHABLE;
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	}
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}
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} // namespace openmsx