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◆ main openmsx / src / serial / MidiInReader.cc
3.4 KiB · C++ · last changed chore(): initial commit 1 month ago source blame history raw
e8555c89 Andy McCall 1 
#include "MidiInReader.hh"
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#include "MidiInConnector.hh"
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#include "EventDistributor.hh"
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#include "FileOperations.hh"
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#include "PlugException.hh"
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#include "Scheduler.hh"
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#include "serialize.hh"
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#include "checked_cast.hh"
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#include <array>
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#include <cerrno>
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#include <cstdio>
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#include <cstring>
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namespace openmsx {
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MidiInReader::MidiInReader(EventDistributor& eventDistributor_,
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                           Scheduler& scheduler_,
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                           CommandController& commandController)
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	: eventDistributor(eventDistributor_), scheduler(scheduler_)
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	, readFilenameSetting(
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		commandController, "midi-in-readfilename",
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		"filename of the file where the MIDI input is read from",
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		"/dev/midi")
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{
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	eventDistributor.registerEventListener(EventType::MIDI_IN_READER, *this);
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}
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MidiInReader::~MidiInReader()
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{
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	eventDistributor.unregisterEventListener(EventType::MIDI_IN_READER, *this);
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}
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// Pluggable
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void MidiInReader::plugHelper(Connector& connector_, EmuTime /*time*/)
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{
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	file = FileOperations::openFile(readFilenameSetting.getString(), "rb");
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	if (!file) {
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		throw PlugException("Failed to open input: ", strerror(errno));
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	}
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	auto& midiConnector = checked_cast<MidiInConnector&>(connector_);
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	midiConnector.setDataBits(SerialDataInterface::DataBits::D8); // 8 data bits
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	midiConnector.setStopBits(SerialDataInterface::StopBits::S1); // 1 stop bit
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	midiConnector.setParityBit(false, SerialDataInterface::Parity::EVEN); // no parity
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	setConnector(&connector_); // base class will do this in a moment,
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	                           // but thread already needs it
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	poller.emplace();
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	thread = std::thread([this]() { run(); });
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}
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void MidiInReader::unplugHelper(EmuTime /*time*/)
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{
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	poller->abort();
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	thread.join();
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	poller.reset();
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	file.reset();
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}
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zstring_view MidiInReader::getName() const
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{
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	return "midi-in-reader";
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}
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zstring_view MidiInReader::getDescription() const
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{
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	return "MIDI in file reader. Sends data from an input file to the "
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	       "MIDI port it is connected to. The filename is set with "
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	       "the 'midi-in-readfilename' setting.";
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}
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void MidiInReader::run()
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{
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	if (!file) return;
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	while (true) {
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#ifndef _WIN32
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		if (poller->poll(fileno(file.get()))) {
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			break;
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		}
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#endif
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		std::array<uint8_t, 1> buf;
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		size_t num = fread(buf.data(), sizeof(uint8_t), buf.size(), file.get());
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		if (poller->aborted()) {
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			break;
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		}
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		if (num != 1) {
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			continue;
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		}
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		assert(isPluggedIn());
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		{
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			std::scoped_lock lock(mutex);
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			queue.push_back(buf[0]);
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		}
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		eventDistributor.distributeEvent(MidiInReaderEvent());
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	}
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}
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// MidiInDevice
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void MidiInReader::signal(EmuTime time)
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{
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	auto* conn = checked_cast<MidiInConnector*>(getConnector());
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	if (!conn->acceptsData()) {
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		std::scoped_lock lock(mutex);
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		queue.clear();
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		return;
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	}
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	if (!conn->ready()) {
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		return;
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	}
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	uint8_t data;
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	{
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		std::scoped_lock lock(mutex);
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		if (queue.empty()) return;
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		data = queue.pop_front();
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	}
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	conn->recvByte(data, time);
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}
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// EventListener
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bool MidiInReader::signalEvent(const Event& /*event*/)
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{
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	if (isPluggedIn()) {
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		signal(scheduler.getCurrentTime());
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	} else {
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		std::scoped_lock lock(mutex);
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		queue.clear();
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	}
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	return false;
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}
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template<typename Archive>
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void MidiInReader::serialize(Archive& /*ar*/, unsigned /*version*/)
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{
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	// don't try to resume a previous logfile (see PrinterPortLogger)
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}
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INSTANTIATE_SERIALIZE_METHODS(MidiInReader);
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REGISTER_POLYMORPHIC_INITIALIZER(Pluggable, MidiInReader, "MidiInReader");
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} // namespace openmsx