boo/lib/audiodev/WASAPI.cpp

#include "lib/win/Win32Common.hpp"

#include <iterator>

#include "boo/IApplication.hpp"
#include "lib/audiodev/AudioVoiceEngine.hpp"

#include <Mmdeviceapi.h>
#include <Audioclient.h>
#include <mmsystem.h>
#include <Functiondiscoverykeys_devpkey.h>

#include <logvisor/logvisor.hpp>
#include <nowide/convert.hpp>
#include <optick.h>

#ifdef TE_VIRTUAL_MIDI
#include <teVirtualMIDI.h>
using pfnvirtualMIDICreatePortEx2 = LPVM_MIDI_PORT(CALLBACK*)(LPCWSTR portName, LPVM_MIDI_DATA_CB callback,
                                                              DWORD_PTR dwCallbackInstance, DWORD maxSysexLength,
                                                              DWORD flags);
using pfnvirtualMIDIClosePort = void(CALLBACK*)(LPVM_MIDI_PORT midiPort);
using pfnvirtualMIDISendData = BOOL(CALLBACK*)(LPVM_MIDI_PORT midiPort, LPBYTE midiDataBytes, DWORD length);
using pfnvirtualMIDIGetDriverVersion = LPCWSTR(CALLBACK*)(PWORD major, PWORD minor, PWORD release, PWORD build);
static pfnvirtualMIDICreatePortEx2 virtualMIDICreatePortEx2PROC = nullptr;
static pfnvirtualMIDIClosePort virtualMIDIClosePortPROC = nullptr;
static pfnvirtualMIDISendData virtualMIDISendDataPROC = nullptr;
static pfnvirtualMIDIGetDriverVersion virtualMIDIGetDriverVersionPROC = nullptr;
static double PerfFrequency = 0.0;
#endif

#if !WINDOWS_STORE
const CLSID CLSID_MMDeviceEnumerator = __uuidof(MMDeviceEnumerator);
const IID IID_IMMDeviceEnumerator = __uuidof(IMMDeviceEnumerator);
#else
using namespace Windows::Media::Devices;
#endif
const IID IID_IAudioClient = __uuidof(IAudioClient);
const IID IID_IAudioRenderClient = __uuidof(IAudioRenderClient);

namespace boo {
static logvisor::Module Log("boo::WASAPI");

#define SAFE_RELEASE(punk)                                                                                             \
  if ((punk) != nullptr) {                                                                                             \
    (punk)->Release();                                                                                                 \
    (punk) = nullptr;                                                                                                  \
  }

struct WASAPIAudioVoiceEngine : BaseAudioVoiceEngine {
#if !WINDOWS_STORE
  ComPtr<IMMDeviceEnumerator> m_enumerator;
  ComPtr<IMMDevice> m_device;
#else
  bool m_ready = false;
#endif
  ComPtr<IAudioClient> m_audClient;
  ComPtr<IAudioRenderClient> m_renderClient;
  std::string m_sinkName;

  size_t m_curBufFrame = 0;
  std::vector<float> m_5msBuffer;

#if !WINDOWS_STORE
  struct NotificationClient final : public IMMNotificationClient {
    WASAPIAudioVoiceEngine& m_parent;

    LONG _cRef;
    IMMDeviceEnumerator* _pEnumerator;

    NotificationClient(WASAPIAudioVoiceEngine& parent) : m_parent(parent), _cRef(1), _pEnumerator(nullptr) {}

    ~NotificationClient(){SAFE_RELEASE(_pEnumerator)}

    // IUnknown methods -- AddRef, Release, and QueryInterface

    ULONG STDMETHODCALLTYPE AddRef() override {
      return InterlockedIncrement(&_cRef);
    }

    ULONG STDMETHODCALLTYPE Release() override {
      ULONG ulRef = InterlockedDecrement(&_cRef);
      if (0 == ulRef) {
        delete this;
      }
      return ulRef;
    }

    HRESULT STDMETHODCALLTYPE QueryInterface(REFIID riid, VOID** ppvInterface) override {
      if (IID_IUnknown == riid) {
        AddRef();
        *ppvInterface = (IUnknown*)this;
      } else if (__uuidof(IMMNotificationClient) == riid) {
        AddRef();
        *ppvInterface = (IMMNotificationClient*)this;
      } else {
        *ppvInterface = nullptr;
        return E_NOINTERFACE;
      }
      return S_OK;
    }

    // Callback methods for device-event notifications.

    HRESULT STDMETHODCALLTYPE OnDefaultDeviceChanged(EDataFlow flow, ERole role, LPCWSTR pwstrDeviceId) override {
      m_parent.m_rebuild = true;
      return S_OK;
    }

    HRESULT STDMETHODCALLTYPE OnDeviceAdded(LPCWSTR pwstrDeviceId) override { return S_OK; }

    HRESULT STDMETHODCALLTYPE OnDeviceRemoved(LPCWSTR pwstrDeviceId) override { return S_OK; }

    HRESULT STDMETHODCALLTYPE OnDeviceStateChanged(LPCWSTR pwstrDeviceId, DWORD dwNewState) override { return S_OK; }

    HRESULT STDMETHODCALLTYPE OnPropertyValueChanged(LPCWSTR pwstrDeviceId, const PROPERTYKEY key) override {
      return S_OK;
    }
  } m_notificationClient;
#endif

  void _buildAudioRenderClient() {
#if !WINDOWS_STORE
    if (!m_device) {
      if (FAILED(m_enumerator->GetDevice(nowide::widen(m_sinkName).c_str(), &m_device))) {
        Log.report(logvisor::Error, FMT_STRING("unable to obtain audio device {}"), m_sinkName);
        m_device.Reset();
        return;
      }
    }

    if (FAILED(m_device->Activate(IID_IAudioClient, CLSCTX_ALL, nullptr, &m_audClient))) {
      Log.report(logvisor::Error, FMT_STRING("unable to create audio client from device"));
      m_device.Reset();
      return;
    }
#endif

    WAVEFORMATEXTENSIBLE* pwfx;
    if (FAILED(m_audClient->GetMixFormat((WAVEFORMATEX**)&pwfx))) {
      Log.report(logvisor::Error, FMT_STRING("unable to obtain audio mix format from device"));
#if !WINDOWS_STORE
      m_device.Reset();
#endif
      return;
    }

    /* Get channel information */
    if ((pwfx->dwChannelMask & (SPEAKER_FRONT_LEFT | SPEAKER_FRONT_RIGHT)) ==
        (SPEAKER_FRONT_LEFT | SPEAKER_FRONT_RIGHT)) {
      m_mixInfo.m_channels = AudioChannelSet::Stereo;
      if ((pwfx->dwChannelMask & (SPEAKER_BACK_LEFT | SPEAKER_BACK_RIGHT)) ==
          (SPEAKER_BACK_LEFT | SPEAKER_BACK_RIGHT)) {
        m_mixInfo.m_channels = AudioChannelSet::Quad;
        if ((pwfx->dwChannelMask & (SPEAKER_FRONT_CENTER | SPEAKER_LOW_FREQUENCY)) ==
            (SPEAKER_FRONT_CENTER | SPEAKER_LOW_FREQUENCY)) {
          m_mixInfo.m_channels = AudioChannelSet::Surround51;
          if ((pwfx->dwChannelMask & (SPEAKER_SIDE_LEFT | SPEAKER_SIDE_RIGHT)) ==
              (SPEAKER_SIDE_LEFT | SPEAKER_SIDE_RIGHT)) {
            m_mixInfo.m_channels = AudioChannelSet::Surround71;
          }
        }
      }
    }

    ChannelMap& chMapOut = m_mixInfo.m_channelMap;
    switch (pwfx->Format.nChannels) {
    case 2:
      chMapOut.m_channelCount = 2;
      chMapOut.m_channels[0] = AudioChannel::FrontLeft;
      chMapOut.m_channels[1] = AudioChannel::FrontRight;
      break;
    case 4:
      chMapOut.m_channelCount = 4;
      chMapOut.m_channels[0] = AudioChannel::FrontLeft;
      chMapOut.m_channels[1] = AudioChannel::FrontRight;
      chMapOut.m_channels[2] = AudioChannel::RearLeft;
      chMapOut.m_channels[3] = AudioChannel::RearRight;
      break;
    case 5:
      chMapOut.m_channelCount = 5;
      chMapOut.m_channels[0] = AudioChannel::FrontLeft;
      chMapOut.m_channels[1] = AudioChannel::FrontRight;
      chMapOut.m_channels[2] = AudioChannel::FrontCenter;
      chMapOut.m_channels[3] = AudioChannel::RearLeft;
      chMapOut.m_channels[4] = AudioChannel::RearRight;
      break;
    case 6:
      chMapOut.m_channelCount = 6;
      chMapOut.m_channels[0] = AudioChannel::FrontLeft;
      chMapOut.m_channels[1] = AudioChannel::FrontRight;
      chMapOut.m_channels[2] = AudioChannel::FrontCenter;
      chMapOut.m_channels[3] = AudioChannel::LFE;
      chMapOut.m_channels[4] = AudioChannel::RearLeft;
      chMapOut.m_channels[5] = AudioChannel::RearRight;
      break;
    case 8:
      chMapOut.m_channelCount = 8;
      chMapOut.m_channels[0] = AudioChannel::FrontLeft;
      chMapOut.m_channels[1] = AudioChannel::FrontRight;
      chMapOut.m_channels[2] = AudioChannel::FrontCenter;
      chMapOut.m_channels[3] = AudioChannel::LFE;
      chMapOut.m_channels[4] = AudioChannel::RearLeft;
      chMapOut.m_channels[5] = AudioChannel::RearRight;
      chMapOut.m_channels[6] = AudioChannel::SideLeft;
      chMapOut.m_channels[7] = AudioChannel::SideRight;
      break;
    default:
      Log.report(logvisor::Warning, FMT_STRING("unknown channel layout {}; using stereo"), pwfx->Format.nChannels);
      chMapOut.m_channelCount = 2;
      chMapOut.m_channels[0] = AudioChannel::FrontLeft;
      chMapOut.m_channels[1] = AudioChannel::FrontRight;
      break;
    }

    /* Initialize audio client */
    if (FAILED(m_audClient->Initialize(AUDCLNT_SHAREMODE_SHARED, 0, 450000, /* 45ms */
                                       0, (WAVEFORMATEX*)pwfx, nullptr))) {
      Log.report(logvisor::Error, FMT_STRING("unable to initialize audio client"));
#if !WINDOWS_STORE
      m_device.Reset();
#endif
      CoTaskMemFree(pwfx);
      return;
    }
    m_mixInfo.m_sampleRate = pwfx->Format.nSamplesPerSec;
    m_5msFrames = (m_mixInfo.m_sampleRate * 5 / 500 + 1) / 2;
    m_curBufFrame = m_5msFrames;
    m_5msBuffer.resize(m_5msFrames * chMapOut.m_channelCount);

    if (pwfx->Format.wFormatTag == WAVE_FORMAT_PCM ||
        (pwfx->Format.wFormatTag == WAVE_FORMAT_EXTENSIBLE && pwfx->SubFormat == KSDATAFORMAT_SUBTYPE_PCM)) {
      if (pwfx->Format.wBitsPerSample == 16) {
        m_mixInfo.m_sampleFormat = SOXR_INT16_I;
        m_mixInfo.m_bitsPerSample = 16;
      } else if (pwfx->Format.wBitsPerSample == 32) {
        m_mixInfo.m_sampleFormat = SOXR_INT32_I;
        m_mixInfo.m_bitsPerSample = 32;
      } else {
        Log.report(logvisor::Fatal, FMT_STRING("unsupported bits-per-sample {}"), pwfx->Format.wBitsPerSample);
#if !WINDOWS_STORE
        m_device.Reset();
#endif
        return;
      }
    } else if (pwfx->Format.wFormatTag == WAVE_FORMAT_IEEE_FLOAT ||
               (pwfx->Format.wFormatTag == WAVE_FORMAT_EXTENSIBLE &&
                pwfx->SubFormat == KSDATAFORMAT_SUBTYPE_IEEE_FLOAT)) {
      if (pwfx->Format.wBitsPerSample == 32) {
        m_mixInfo.m_sampleFormat = SOXR_FLOAT32_I;
        m_mixInfo.m_bitsPerSample = 32;
      } else {
        Log.report(logvisor::Error, FMT_STRING("unsupported floating-point bits-per-sample {}"), pwfx->Format.wBitsPerSample);
#if !WINDOWS_STORE
        m_device.Reset();
#endif
        return;
      }
    }

    CoTaskMemFree(pwfx);

    UINT32 bufferFrameCount;
    if (FAILED(m_audClient->GetBufferSize(&bufferFrameCount))) {
      Log.report(logvisor::Error, FMT_STRING("unable to get audio buffer frame count"));
#if !WINDOWS_STORE
      m_device.Reset();
#endif
      return;
    }
    m_mixInfo.m_periodFrames = bufferFrameCount;

    if (FAILED(m_audClient->GetService(IID_IAudioRenderClient, &m_renderClient))) {
      Log.report(logvisor::Error, FMT_STRING("unable to create audio render client"));
#if !WINDOWS_STORE
      m_device.Reset();
#endif
      return;
    }
  }

#if WINDOWS_STORE
  struct CompletionHandler : IActivateAudioInterfaceCompletionHandler {
    WASAPIAudioVoiceEngine& e;
    LONG _cRef = 1;

    CompletionHandler(WASAPIAudioVoiceEngine& e) : e(e) {}
    HRESULT ActivateCompleted(IActivateAudioInterfaceAsyncOperation* operation) {
      return e.ActivateCompleted(operation);
    }

    ULONG STDMETHODCALLTYPE AddRef() { return InterlockedIncrement(&_cRef); }

    ULONG STDMETHODCALLTYPE Release() {
      ULONG ulRef = InterlockedDecrement(&_cRef);
      if (0 == ulRef) {
        delete this;
      }
      return ulRef;
    }

    HRESULT STDMETHODCALLTYPE QueryInterface(REFIID riid, VOID** ppvInterface) {
      if (IID_IUnknown == riid) {
        AddRef();
        *ppvInterface = (IUnknown*)this;
      } else if (__uuidof(IActivateAudioInterfaceCompletionHandler) == riid) {
        AddRef();
        *ppvInterface = (IActivateAudioInterfaceCompletionHandler*)this;
      } else {
        *ppvInterface = nullptr;
        return E_NOINTERFACE;
      }
      return S_OK;
    }
  } m_completion = {*this};
  HRESULT ActivateCompleted(IActivateAudioInterfaceAsyncOperation* operation) {
    ComPtr<IUnknown> punkAudioInterface;
    HRESULT hrActivateResult;
    operation->GetActivateResult(&hrActivateResult, &punkAudioInterface);
    punkAudioInterface.As<IAudioClient>(&m_audClient);
    _buildAudioRenderClient();
    m_ready = true;
    return ERROR_SUCCESS;
  }
#endif

  WASAPIAudioVoiceEngine()
#if !WINDOWS_STORE
  : m_notificationClient(*this)
#endif
  {
#if !WINDOWS_STORE
#ifdef TE_VIRTUAL_MIDI
    HMODULE virtualMidiModule;
    if (!virtualMIDICreatePortEx2PROC && (virtualMidiModule = LoadLibraryW(L"teVirtualMIDI64.dll"))) {
      virtualMIDICreatePortEx2PROC =
          (pfnvirtualMIDICreatePortEx2)GetProcAddress(virtualMidiModule, "virtualMIDICreatePortEx2");
      virtualMIDIClosePortPROC = (pfnvirtualMIDIClosePort)GetProcAddress(virtualMidiModule, "virtualMIDIClosePort");
      virtualMIDISendDataPROC = (pfnvirtualMIDISendData)GetProcAddress(virtualMidiModule, "virtualMIDISendData");
      virtualMIDIGetDriverVersionPROC =
          (pfnvirtualMIDIGetDriverVersion)GetProcAddress(virtualMidiModule, "virtualMIDIGetDriverVersion");
      LARGE_INTEGER pf;
      QueryPerformanceFrequency(&pf);
      PerfFrequency = double(pf.QuadPart);
    }
#endif

    /* Enumerate default audio device */
    if (FAILED(
            CoCreateInstance(CLSID_MMDeviceEnumerator, nullptr, CLSCTX_ALL, IID_IMMDeviceEnumerator, &m_enumerator))) {
      Log.report(logvisor::Error, FMT_STRING("unable to create MMDeviceEnumerator instance"));
      return;
    }

    if (FAILED(m_enumerator->RegisterEndpointNotificationCallback(&m_notificationClient))) {
      Log.report(logvisor::Error, FMT_STRING("unable to register multimedia event callback"));
      m_device.Reset();
      return;
    }

    if (FAILED(m_enumerator->GetDefaultAudioEndpoint(eRender, eConsole, &m_device))) {
      Log.report(logvisor::Error, FMT_STRING("unable to obtain default audio device"));
      m_device.Reset();
      return;
    }
    LPWSTR sinkName = nullptr;
    m_device->GetId(&sinkName);
    m_sinkName = nowide::narrow(sinkName);
    CoTaskMemFree(sinkName);

    _buildAudioRenderClient();
#else
    auto deviceIdStr = MediaDevice::GetDefaultAudioRenderId(Windows::Media::Devices::AudioDeviceRole::Default);
    ComPtr<IActivateAudioInterfaceAsyncOperation> asyncOp;
    ActivateAudioInterfaceAsync(deviceIdStr->Data(), __uuidof(IAudioClient3), nullptr, &m_completion, &asyncOp);
#endif
  }

  bool m_started = false;
  bool m_rebuild = false;

  void _rebuildAudioRenderClient() {
    soxr_datatype_t oldFmt = m_mixInfo.m_sampleFormat;

    _buildAudioRenderClient();
    m_rebuild = false;
    m_started = false;

    if (m_mixInfo.m_sampleFormat != oldFmt)
      Log.report(logvisor::Fatal, FMT_STRING("audio device sample format changed, boo doesn't support this!!"));

    _resetSampleRate();
  }

  void pumpAndMixVoices() override {
    OPTICK_EVENT();
#if WINDOWS_STORE
    if (!m_ready)
      return;
#else
    if (!m_device)
      return;
#endif

    int attempt = 0;
    while (true) {
      if (attempt >= 10)
        Log.report(logvisor::Fatal, FMT_STRING("unable to setup AudioRenderClient"));

      if (m_rebuild) {
        m_device.Reset();
        _rebuildAudioRenderClient();
      }

      HRESULT res;
      if (!m_started) {
        res = m_audClient->Start();
        if (FAILED(res)) {
          m_rebuild = true;
          ++attempt;
          continue;
        }
        m_started = true;
      }

      UINT32 numFramesPadding;
      res = m_audClient->GetCurrentPadding(&numFramesPadding);
      if (FAILED(res)) {
        m_rebuild = true;
        ++attempt;
        continue;
      }

      size_t frames = m_mixInfo.m_periodFrames - numFramesPadding;
      if (frames <= 0)
        return;

      BYTE* bufOut;
      res = m_renderClient->GetBuffer(frames, &bufOut);
      if (FAILED(res)) {
        m_rebuild = true;
        ++attempt;
        continue;
      }

      for (size_t f = 0; f < frames;) {
        if (m_curBufFrame == m_5msFrames) {
          _pumpAndMixVoices(m_5msFrames, m_5msBuffer.data());
          m_curBufFrame = 0;
        }

        size_t remRenderFrames = std::min(frames - f, m_5msFrames - m_curBufFrame);
        if (remRenderFrames) {
          memmove(reinterpret_cast<float*>(bufOut) + m_mixInfo.m_channelMap.m_channelCount * f,
                  &m_5msBuffer[m_curBufFrame * m_mixInfo.m_channelMap.m_channelCount],
                  remRenderFrames * m_mixInfo.m_channelMap.m_channelCount * sizeof(float));
          m_curBufFrame += remRenderFrames;
          f += remRenderFrames;
        }
      }

      res = m_renderClient->ReleaseBuffer(frames, 0);
      if (FAILED(res)) {
        m_rebuild = true;
        ++attempt;
        continue;
      }

      break;
    }
  }

  std::string getCurrentAudioOutput() const override { return m_sinkName; }

  bool setCurrentAudioOutput(const char* name) override {
    ComPtr<IMMDevice> newDevice;
    if (FAILED(m_enumerator->GetDevice(nowide::widen(name).c_str(), &newDevice))) {
      Log.report(logvisor::Error, FMT_STRING("unable to obtain audio device {}"), name);
      return false;
    }
    m_device = newDevice;
    m_sinkName = name;
    _rebuildAudioRenderClient();
    return true;
  }

  std::vector<std::pair<std::string, std::string>> enumerateAudioOutputs() const override {
    std::vector<std::pair<std::string, std::string>> ret;

    ComPtr<IMMDeviceCollection> collection;
    if (FAILED(m_enumerator->EnumAudioEndpoints(eRender, DEVICE_STATE_ACTIVE, &collection))) {
      Log.report(logvisor::Error, FMT_STRING("unable to enumerate audio outputs"));
      return ret;
    }

    UINT count = 0;
    collection->GetCount(&count);
    for (UINT i = 0; i < count; ++i) {
      ComPtr<IMMDevice> device;
      collection->Item(i, &device);
      LPWSTR devName;
      device->GetId(&devName);
      ComPtr<IPropertyStore> props;
      device->OpenPropertyStore(STGM_READ, &props);
      PROPVARIANT val = {};
      props->GetValue(PKEY_Device_FriendlyName, &val);
      std::string friendlyName;
      if (val.vt == VT_LPWSTR)
        friendlyName = nowide::narrow(val.pwszVal);
      ret.emplace_back(nowide::narrow(devName), std::move(friendlyName));
    }

    return ret;
  }

#if !WINDOWS_STORE
  std::vector<std::pair<std::string, std::string>> enumerateMIDIInputs() const override {
    std::vector<std::pair<std::string, std::string>> ret;

    UINT numInDevices = midiInGetNumDevs();
    ret.reserve(numInDevices);

    for (UINT i = 0; i < numInDevices; ++i) {
      std::string name = fmt::format(FMT_STRING("in{}"), i);

      MIDIINCAPS caps;
      if (FAILED(midiInGetDevCaps(i, &caps, sizeof(caps))))
        continue;

#ifdef UNICODE
      ret.emplace_back(std::move(name), nowide::narrow(caps.szPname));
#else
      ret.emplace_back(std::move(name), std::string(caps.szPname));
#endif
    }

    return ret;
  }

  bool supportsVirtualMIDIIn() const override {
#ifdef TE_VIRTUAL_MIDI
    WORD major, minor, release, build;
    return virtualMIDIGetDriverVersionPROC &&
           virtualMIDIGetDriverVersionPROC(&major, &minor, &release, &build) != nullptr;
#else
    return false;
#endif
  }

#ifdef TE_VIRTUAL_MIDI
  static void CALLBACK VirtualMIDIReceiveProc(LPVM_MIDI_PORT midiPort, LPBYTE midiDataBytes, DWORD length,
                                              IMIDIReceiver* dwInstance) {
    std::vector<uint8_t> bytes;
    bytes.resize(length);
    memcpy(&bytes[0], midiDataBytes, length);

    double timestamp;
    LARGE_INTEGER perf;
    QueryPerformanceCounter(&perf);
    timestamp = perf.QuadPart / PerfFrequency;

    dwInstance->m_receiver(std::move(bytes), timestamp);
  }
#endif

  static void CALLBACK MIDIReceiveProc(HMIDIIN hMidiIn, UINT wMsg, IMIDIReceiver* dwInstance, DWORD_PTR dwParam1,
                                       DWORD_PTR dwParam2) {
    if (wMsg == MIM_DATA) {
      uint8_t(&ptr)[3] = reinterpret_cast<uint8_t(&)[3]>(dwParam1);
      std::vector<uint8_t> bytes(std::cbegin(ptr), std::cend(ptr));
      dwInstance->m_receiver(std::move(bytes), dwParam2 / 1000.0);
    }
  }

#ifdef TE_VIRTUAL_MIDI
  struct VMIDIIn : public IMIDIIn {
    LPVM_MIDI_PORT m_midi = 0;

    VMIDIIn(WASAPIAudioVoiceEngine* parent, ReceiveFunctor&& receiver) : IMIDIIn(parent, true, std::move(receiver)) {}

    ~VMIDIIn() override { virtualMIDIClosePortPROC(m_midi); }

    std::string description() const override { return "Virtual MIDI-In"; }
  };

  struct VMIDIOut : public IMIDIOut {
    LPVM_MIDI_PORT m_midi = 0;

    VMIDIOut(WASAPIAudioVoiceEngine* parent) : IMIDIOut(parent, true) {}

    ~VMIDIOut() override { virtualMIDIClosePortPROC(m_midi); }

    std::string description() const override { return "Virtual MIDI-Out"; }

    size_t send(const void* buf, size_t len) const override {
      return virtualMIDISendDataPROC(m_midi, (LPBYTE)buf, len) ? len : 0;
    }
  };

  struct VMIDIInOut : public IMIDIInOut {
    LPVM_MIDI_PORT m_midi = 0;

    VMIDIInOut(WASAPIAudioVoiceEngine* parent, ReceiveFunctor&& receiver)
    : IMIDIInOut(parent, true, std::move(receiver)) {}

    ~VMIDIInOut() override { virtualMIDIClosePortPROC(m_midi); }

    std::string description() const override { return "Virtual MIDI-In/Out"; }

    size_t send(const void* buf, size_t len) const override {
      return virtualMIDISendDataPROC(m_midi, (LPBYTE)buf, len) ? len : 0;
    }
  };
#endif

  struct MIDIIn : public IMIDIIn {
    HMIDIIN m_midi = 0;

    MIDIIn(WASAPIAudioVoiceEngine* parent, ReceiveFunctor&& receiver) : IMIDIIn(parent, false, std::move(receiver)) {}

    ~MIDIIn() override { midiInClose(m_midi); }

    std::string description() const override {
      UINT id = 0;
      midiInGetID(m_midi, &id);
      MIDIINCAPS caps;
      if (FAILED(midiInGetDevCaps(id, &caps, sizeof(caps))))
        return {};

#ifdef UNICODE
      return nowide::narrow(caps.szPname);
#else
      return caps.szPname;
#endif
    }
  };

  struct MIDIOut : public IMIDIOut {
    HMIDIOUT m_midi = 0;
    HMIDISTRM m_strm = 0;
    uint8_t m_buf[512];
    MIDIHDR m_hdr = {};

    MIDIOut(WASAPIAudioVoiceEngine* parent) : IMIDIOut(parent, false) {}

    void prepare() {
      UINT id = 0;
      midiOutGetID(m_midi, &id);

      m_hdr.lpData = reinterpret_cast<LPSTR>(m_buf);
      m_hdr.dwBufferLength = 512;
      m_hdr.dwFlags = MHDR_ISSTRM;
      midiOutPrepareHeader(m_midi, &m_hdr, sizeof(m_hdr));
      midiStreamOpen(&m_strm, &id, 1, 0, 0, CALLBACK_NULL);
    }

    ~MIDIOut() override {
      midiStreamClose(m_strm);
      midiOutUnprepareHeader(m_midi, &m_hdr, sizeof(m_hdr));
      midiOutClose(m_midi);
    }

    std::string description() const override {
      UINT id = 0;
      midiOutGetID(m_midi, &id);
      MIDIOUTCAPS caps;
      if (FAILED(midiOutGetDevCaps(id, &caps, sizeof(caps))))
        return {};

#ifdef UNICODE
      return nowide::narrow(caps.szPname);
#else
      return caps.szPname;
#endif
    }

    size_t send(const void* buf, size_t len) const override {
      memcpy(const_cast<MIDIOut*>(this)->m_buf, buf, std::min(len, size_t(512)));
      const_cast<MIDIOut*>(this)->m_hdr.dwBytesRecorded = len;
      midiStreamOut(m_strm, LPMIDIHDR(&m_hdr), sizeof(m_hdr));
      return len;
    }
  };

  struct MIDIInOut : public IMIDIInOut {
    HMIDIIN m_midiIn = 0;
    HMIDIOUT m_midiOut = 0;
    HMIDISTRM m_strm = 0;
    uint8_t m_buf[512];
    MIDIHDR m_hdr = {};

    MIDIInOut(WASAPIAudioVoiceEngine* parent, ReceiveFunctor&& receiver)
    : IMIDIInOut(parent, false, std::move(receiver)) {}

    void prepare() {
      UINT id = 0;
      midiOutGetID(m_midiOut, &id);

      m_hdr.lpData = reinterpret_cast<LPSTR>(m_buf);
      m_hdr.dwBufferLength = 512;
      m_hdr.dwFlags = MHDR_ISSTRM;
      midiOutPrepareHeader(m_midiOut, &m_hdr, sizeof(m_hdr));
      midiStreamOpen(&m_strm, &id, 1, 0, 0, CALLBACK_NULL);
    }

    ~MIDIInOut() override {
      midiInClose(m_midiIn);
      midiStreamClose(m_strm);
      midiOutUnprepareHeader(m_midiOut, &m_hdr, sizeof(m_hdr));
      midiOutClose(m_midiOut);
    }

    std::string description() const override {
      UINT id = 0;
      midiOutGetID(m_midiOut, &id);
      MIDIOUTCAPS caps;
      if (FAILED(midiOutGetDevCaps(id, &caps, sizeof(caps))))
        return {};

#ifdef UNICODE
      return nowide::narrow(caps.szPname);
#else
      return caps.szPname;
#endif
    }

    size_t send(const void* buf, size_t len) const override {
      memcpy(const_cast<uint8_t*>(m_buf), buf, std::min(len, size_t(512)));
      const_cast<MIDIHDR&>(m_hdr).dwBytesRecorded = len;
      midiStreamOut(m_strm, LPMIDIHDR(&m_hdr), sizeof(m_hdr));
      return len;
    }
  };

  std::unique_ptr<IMIDIIn> newVirtualMIDIIn(ReceiveFunctor&& receiver) override {
#ifdef TE_VIRTUAL_MIDI
    if (!virtualMIDICreatePortEx2PROC)
      return {};

    std::unique_ptr<IMIDIIn> ret = std::make_unique<VMIDIIn>(this, std::move(receiver));
    if (!ret)
      return {};

    std::string name = std::string(APP->getFriendlyName()) + " MIDI-In";
    auto port = virtualMIDICreatePortEx2PROC(name.c_str(), LPVM_MIDI_DATA_CB(VirtualMIDIReceiveProc),
                                             DWORD_PTR(static_cast<IMIDIReceiver*>(ret.get())), 512,
                                             TE_VM_FLAGS_PARSE_RX | TE_VM_FLAGS_INSTANTIATE_RX_ONLY);
    if (!port)
      return {};
    static_cast<VMIDIIn&>(*ret).m_midi = port;
    return ret;
#else
    return {};
#endif
  }

  std::unique_ptr<IMIDIOut> newVirtualMIDIOut() override {
#ifdef TE_VIRTUAL_MIDI
    if (!virtualMIDICreatePortEx2PROC)
      return {};

    std::unique_ptr<IMIDIOut> ret = std::make_unique<VMIDIOut>(this);
    if (!ret)
      return {};

    std::string name = std::string(APP->getFriendlyName()) + " MIDI-Out";
    auto port = virtualMIDICreatePortEx2PROC(name.c_str(), nullptr, 0, 512,
                                             TE_VM_FLAGS_PARSE_TX | TE_VM_FLAGS_INSTANTIATE_TX_ONLY);
    if (!port)
      return {};
    static_cast<VMIDIOut&>(*ret).m_midi = port;
    return ret;
#else
    return {};
#endif
  }

  std::unique_ptr<IMIDIInOut> newVirtualMIDIInOut(ReceiveFunctor&& receiver) override {
#ifdef TE_VIRTUAL_MIDI
    if (!virtualMIDICreatePortEx2PROC)
      return {};

    std::unique_ptr<IMIDIInOut> ret = std::make_unique<VMIDIInOut>(this, std::move(receiver));
    if (!ret)
      return {};

    std::string name = std::string(APP->getFriendlyName()) + " MIDI-In/Out";
    auto port =
        virtualMIDICreatePortEx2PROC(name.c_str(), LPVM_MIDI_DATA_CB(VirtualMIDIReceiveProc),
                                     DWORD_PTR(static_cast<IMIDIReceiver*>(ret.get())), 512, TE_VM_FLAGS_SUPPORTED);
    if (!port)
      return {};
    static_cast<VMIDIInOut&>(*ret).m_midi = port;
    return ret;
#else
    return {};
#endif
  }

  std::unique_ptr<IMIDIIn> newRealMIDIIn(const char* name, ReceiveFunctor&& receiver) override {
    if (strncmp(name, "in", 2))
      return {};
    long id = strtol(name + 2, nullptr, 10);

    std::unique_ptr<IMIDIIn> ret = std::make_unique<MIDIIn>(this, std::move(receiver));
    if (!ret)
      return {};

    if (FAILED(midiInOpen(&static_cast<MIDIIn&>(*ret).m_midi, id, DWORD_PTR(MIDIReceiveProc),
                          DWORD_PTR(static_cast<IMIDIReceiver*>(ret.get())), CALLBACK_FUNCTION)))
      return {};
    midiInStart(static_cast<MIDIIn&>(*ret).m_midi);

    return ret;
  }

  std::unique_ptr<IMIDIOut> newRealMIDIOut(const char* name) override {
    if (strncmp(name, "out", 3))
      return {};
    long id = strtol(name + 3, nullptr, 10);

    std::unique_ptr<IMIDIOut> ret = std::make_unique<MIDIOut>(this);
    if (!ret)
      return {};

    if (FAILED(midiOutOpen(&static_cast<MIDIOut&>(*ret).m_midi, id, 0, 0, CALLBACK_NULL)))
      return {};

    static_cast<MIDIOut&>(*ret).prepare();
    return ret;
  }

  std::unique_ptr<IMIDIInOut> newRealMIDIInOut(const char* name, ReceiveFunctor&& receiver) override {
    const char* in = strstr(name, "in");
    const char* out = strstr(name, "out");

    if (!in || !out)
      return {};

    long inId = strtol(in + 2, nullptr, 10);
    long outId = strtol(out + 3, nullptr, 10);

    std::unique_ptr<IMIDIInOut> ret = std::make_unique<MIDIInOut>(this, std::move(receiver));
    if (!ret)
      return {};

    if (FAILED(midiInOpen(&static_cast<MIDIInOut&>(*ret).m_midiIn, inId, DWORD_PTR(MIDIReceiveProc),
                          DWORD_PTR(static_cast<IMIDIReceiver*>(ret.get())), CALLBACK_FUNCTION)))
      return {};
    midiInStart(static_cast<MIDIInOut&>(*ret).m_midiIn);

    if (FAILED(midiOutOpen(&static_cast<MIDIInOut&>(*ret).m_midiOut, outId, 0, 0, CALLBACK_NULL)))
      return {};

    static_cast<MIDIInOut&>(*ret).prepare();
    return ret;
  }

  bool useMIDILock() const override { return true; }
#else
  std::vector<std::pair<std::string, std::string>> enumerateMIDIDevices() const override { return {}; }

  std::unique_ptr<IMIDIIn> newVirtualMIDIIn(ReceiveFunctor&& receiver) override { return {}; }

  std::unique_ptr<IMIDIOut> newVirtualMIDIOut() override { return {}; }

  std::unique_ptr<IMIDIInOut> newVirtualMIDIInOut(ReceiveFunctor&& receiver) override { return {}; }

  std::unique_ptr<IMIDIIn> newRealMIDIIn(const char* name, ReceiveFunctor&& receiver) override { return {}; }

  std::unique_ptr<IMIDIOut> newRealMIDIOut(const char* name) override { return {}; }

  std::unique_ptr<IMIDIInOut> newRealMIDIInOut(const char* name, ReceiveFunctor&& receiver) override { return {}; }

  bool useMIDILock() const { return false; }
#endif
};

std::unique_ptr<IAudioVoiceEngine> NewAudioVoiceEngine(const char* uniqueName, const char* friendlyName) {
  return std::make_unique<WASAPIAudioVoiceEngine>();
}

} // namespace boo