MidiInWindows.cc

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#if defined(_WIN32)
#include "MidiInWindows.hh"
#include "MidiInConnector.hh"
#include "PluggingController.hh"
#include "PlugException.hh"
#include "EventDistributor.hh"
#include "Scheduler.hh"
#include "one_of.hh"
#include "serialize.hh"
#include "xrange.hh"
#include <cstring>
#include <cerrno>
#include "Midi_w32.hh"
#ifndef WIN32_LEAN_AND_MEAN
#define WIN32_LEAN_AND_MEAN
#endif
#include <Windows.h>
#include <mmsystem.h>
#include <memory>
#include <sys/types.h>
#include <sys/stat.h>
 
namespace openmsx {
 
void MidiInWindows::registerAll(EventDistributor& eventDistributor,
                                Scheduler& scheduler,
                                PluggingController& controller)
{
        w32_midiInInit();
        for (auto i : xrange(w32_midiInGetVFNsNum())) {
                controller.registerPluggable(std::make_unique<MidiInWindows>(
                        eventDistributor, scheduler, i));
        }
}
 
 
MidiInWindows::MidiInWindows(EventDistributor& eventDistributor_,
                             Scheduler& scheduler_, unsigned num)
        : eventDistributor(eventDistributor_), scheduler(scheduler_)
{
        name = w32_midiInGetVFN(num);
        desc = w32_midiInGetRDN(num);
 
        eventDistributor.registerEventListener(EventType::MIDI_IN_WINDOWS, *this);
}
 
MidiInWindows::~MidiInWindows()
{
        eventDistributor.unregisterEventListener(EventType::MIDI_IN_WINDOWS, *this);
 
        //w32_midiInClean(); // TODO
}
 
// Pluggable
void MidiInWindows::plugHelper(Connector& connector_, EmuTime::param /*time*/)
{
        auto& midiConnector = static_cast<MidiInConnector&>(connector_);
        midiConnector.setDataBits(SerialDataInterface::DATA_8); // 8 data bits
        midiConnector.setStopBits(SerialDataInterface::STOP_1); // 1 stop bit
        midiConnector.setParityBit(false, SerialDataInterface::EVEN); // no parity
 
        setConnector(&connector_); // base class will do this in a moment,
                                   // but thread already needs it
 
        {
                std::unique_lock threadIdLock(threadIdMutex);
                thread = std::thread([this]() { run(); });
                threadIdCond.wait(threadIdLock);
        }
        {
                std::scoped_lock devIdxLock(devIdxMutex);
                devIdx = w32_midiInOpen(name.c_str(), threadId);
        }
        devIdxCond.notify_all();
        if (devIdx == unsigned(-1)) {
                throw PlugException("Failed to open " + name);
        }
}
 
void MidiInWindows::unplugHelper(EmuTime::param /*time*/)
{
        assert(devIdx != unsigned(-1));
        w32_midiInClose(devIdx);
        devIdx = unsigned(-1);
        thread.join();
}
 
std::string_view MidiInWindows::getName() const
{
        return name;
}
 
std::string_view MidiInWindows::getDescription() const
{
        return desc;
}
 
void MidiInWindows::procLongMsg(LPMIDIHDR p)
{
        if (p->dwBytesRecorded) {
                {
                        std::scoped_lock lock(queueMutex);
                        for (auto i : xrange(p->dwBytesRecorded)) {
                                queue.push_back(p->lpData[i]);
                        }
                }
                eventDistributor.distributeEvent(MidiInWindowsEvent());
        }
}
 
void MidiInWindows::procShortMsg(DWORD param)
{
        int num;
        switch (param & 0xF0) {
                case 0x80: case 0x90: case 0xA0: case 0xB0: case 0xE0:
                        num = 3; break;
                case 0xC0: case 0xD0:
                        num = 2; break;
                default:
                        num = 1; break;
        }
        std::scoped_lock lock(queueMutex);
        while (num--) {
                queue.push_back(param & 0xFF);
                param >>= 8;
        }
        eventDistributor.distributeEvent(MidiInWindowsEvent());
}
 
void MidiInWindows::run()
{
        assert(isPluggedIn());
 
        {
                std::scoped_lock threadIdLock(threadIdMutex);
                threadId = GetCurrentThreadId();
        }
 
        {
                std::unique_lock devIdxLock(devIdxMutex);
                threadIdCond.notify_all();
                devIdxCond.wait(devIdxLock);
        }
 
        bool fexit = devIdx == unsigned(-1);
        while (!fexit) {
                MSG msg;
                if (GetMessage(&msg, nullptr, 0, 0) == one_of(0, -1)) {
                        break;
                }
                switch (msg.message) {
                        case MM_MIM_OPEN:
                                break;
                        case MM_MIM_DATA:
                        case MM_MIM_MOREDATA:
                                procShortMsg(DWORD(msg.lParam));
                                break;
                        case MM_MIM_LONGDATA:
                                procLongMsg(reinterpret_cast<LPMIDIHDR>(msg.lParam));
                                break;
                        case MM_MIM_ERROR:
                        case MM_MIM_LONGERROR:
                        case MM_MIM_CLOSE:
                                fexit = true;
                                break;
                        default:
                                break;
                }
        }
        threadId = 0;
}
 
// MidiInDevice
void MidiInWindows::signal(EmuTime::param time)
{
        auto* conn = static_cast<MidiInConnector*>(getConnector());
        if (!conn->acceptsData()) {
                std::scoped_lock lock(queueMutex);
                queue.clear();
                return;
        }
        if (!conn->ready()) return;
 
        byte data;
        {
                std::scoped_lock lock(queueMutex);
                if (queue.empty()) return;
                data = queue.pop_front();
        }
        conn->recvByte(data, time);
}
 
// EventListener
int MidiInWindows::signalEvent(const Event& /*event*/)
{
        if (isPluggedIn()) {
                signal(scheduler.getCurrentTime());
        } else {
                std::scoped_lock lock(queueMutex);
                queue.clear();
        }
        return 0;
}
 
template<typename Archive>
void MidiInWindows::serialize(Archive& /*ar*/, unsigned /*version*/)
{
        // don't restore this after loadstate
}
INSTANTIATE_SERIALIZE_METHODS(MidiInWindows);
REGISTER_POLYMORPHIC_INITIALIZER(Pluggable, MidiInWindows, "MidiInWindows");
 
} // namespace openmsx
 
#endif // defined(_WIN32)