godot/drivers/wasapi/audio_driver_wasapi.cpp

/*************************************************************************/
/*  audio_driver_wasapi.cpp                                              */
/*************************************************************************/
/*                       This file is part of:                           */
/*                           GODOT ENGINE                                */
/*                      https://godotengine.org                          */
/*************************************************************************/
/* Copyright (c) 2007-2018 Juan Linietsky, Ariel Manzur.                 */
/* Copyright (c) 2014-2018 Godot Engine contributors (cf. AUTHORS.md)    */
/*                                                                       */
/* Permission is hereby granted, free of charge, to any person obtaining */
/* a copy of this software and associated documentation files (the       */
/* "Software"), to deal in the Software without restriction, including   */
/* without limitation the rights to use, copy, modify, merge, publish,   */
/* distribute, sublicense, and/or sell copies of the Software, and to    */
/* permit persons to whom the Software is furnished to do so, subject to */
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/* The above copyright notice and this permission notice shall be        */
/* included in all copies or substantial portions of the Software.       */
/*                                                                       */
/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,       */
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/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
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/*************************************************************************/

#ifdef WASAPI_ENABLED

#include "audio_driver_wasapi.h"

#include <Functiondiscoverykeys_devpkey.h>

#include "os/os.h"
#include "project_settings.h"

#include <functiondiscoverykeys.h>

#ifndef PKEY_Device_FriendlyName

#undef DEFINE_PROPERTYKEY
/* clang-format off */
#define DEFINE_PROPERTYKEY(id, a, b, c, d, e, f, g, h, i, j, k, l) \
	const PROPERTYKEY id = { { a, b, c, { d, e, f, g, h, i, j, k, } }, l };
/* clang-format on */

DEFINE_PROPERTYKEY(PKEY_Device_FriendlyName, 0xa45c254e, 0xdf1c, 0x4efd, 0x80, 0x20, 0x67, 0xd1, 0x46, 0xa8, 0x50, 0xe0, 14);
#endif

const CLSID CLSID_MMDeviceEnumerator = __uuidof(MMDeviceEnumerator);
const IID IID_IMMDeviceEnumerator = __uuidof(IMMDeviceEnumerator);
const IID IID_IAudioClient = __uuidof(IAudioClient);
const IID IID_IAudioRenderClient = __uuidof(IAudioRenderClient);
const IID IID_IAudioCaptureClient = __uuidof(IAudioCaptureClient);

#define SAFE_RELEASE(memory) \
	if ((memory) != NULL) {  \
		(memory)->Release(); \
		(memory) = NULL;     \
	}

#define REFTIMES_PER_SEC 10000000
#define REFTIMES_PER_MILLISEC 10000

static StringName capture_device_id;
static bool default_render_device_changed = false;
static bool default_capture_device_changed = false;

class CMMNotificationClient : public IMMNotificationClient {
	LONG _cRef;
	IMMDeviceEnumerator *_pEnumerator;

public:
	CMMNotificationClient() :
			_cRef(1),
			_pEnumerator(NULL) {}
	~CMMNotificationClient() {
		if ((_pEnumerator) != NULL) {
			(_pEnumerator)->Release();
			(_pEnumerator) = NULL;
		}
	}

	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(IMMNotificationClient) == riid) {
			AddRef();
			*ppvInterface = (IMMNotificationClient *)this;
		} else {
			*ppvInterface = NULL;
			return E_NOINTERFACE;
		}
		return S_OK;
	}

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

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

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

	HRESULT STDMETHODCALLTYPE OnDefaultDeviceChanged(EDataFlow flow, ERole role, LPCWSTR pwstrDeviceId) {
		if (role == eConsole) {
			if (flow == eRender) {
				default_render_device_changed = true;
			} else if (flow == eCapture) {
				default_capture_device_changed = true;
				capture_device_id = String(pwstrDeviceId);
			}
		}

		return S_OK;
	}

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

static CMMNotificationClient notif_client;

Error AudioDriverWASAPI::init_render_device(bool reinit) {

	WAVEFORMATEX *pwfex;
	IMMDeviceEnumerator *enumerator = NULL;
	IMMDevice *device = NULL;

	CoInitialize(NULL);

	HRESULT hr = CoCreateInstance(CLSID_MMDeviceEnumerator, NULL, CLSCTX_ALL, IID_IMMDeviceEnumerator, (void **)&enumerator);
	ERR_FAIL_COND_V(hr != S_OK, ERR_CANT_OPEN);

	if (device_name == "Default") {
		hr = enumerator->GetDefaultAudioEndpoint(eRender, eConsole, &device);
	} else {
		IMMDeviceCollection *devices = NULL;

		hr = enumerator->EnumAudioEndpoints(eRender, DEVICE_STATE_ACTIVE, &devices);
		ERR_FAIL_COND_V(hr != S_OK, ERR_CANT_OPEN);

		LPWSTR strId = NULL;
		bool found = false;

		UINT count = 0;
		hr = devices->GetCount(&count);
		ERR_FAIL_COND_V(hr != S_OK, ERR_CANT_OPEN);

		for (ULONG i = 0; i < count && !found; i++) {
			IMMDevice *device = NULL;

			hr = devices->Item(i, &device);
			ERR_BREAK(hr != S_OK);

			IPropertyStore *props = NULL;
			hr = device->OpenPropertyStore(STGM_READ, &props);
			ERR_BREAK(hr != S_OK);

			PROPVARIANT propvar;
			PropVariantInit(&propvar);

			hr = props->GetValue(PKEY_Device_FriendlyName, &propvar);
			ERR_BREAK(hr != S_OK);

			if (device_name == String(propvar.pwszVal)) {
				hr = device->GetId(&strId);
				ERR_BREAK(hr != S_OK);

				found = true;
			}

			PropVariantClear(&propvar);
			props->Release();
			device->Release();
		}

		if (found) {
			hr = enumerator->GetDevice(strId, &device);
		}

		if (strId) {
			CoTaskMemFree(strId);
		}

		if (device == NULL) {
			hr = enumerator->GetDefaultAudioEndpoint(eRender, eConsole, &device);
		}
	}
	if (reinit) {
		// In case we're trying to re-initialize the device prevent throwing this error on the console,
		// otherwise if there is currently no device available this will spam the console.
		if (hr != S_OK) {
			return ERR_CANT_OPEN;
		}
	} else {
		ERR_FAIL_COND_V(hr != S_OK, ERR_CANT_OPEN);
	}

	hr = enumerator->RegisterEndpointNotificationCallback(&notif_client);
	SAFE_RELEASE(enumerator)

	if (hr != S_OK) {
		ERR_PRINT("WASAPI: RegisterEndpointNotificationCallback error");
	}

	hr = device->Activate(IID_IAudioClient, CLSCTX_ALL, NULL, (void **)&audio_client);
	SAFE_RELEASE(device)

	if (reinit) {
		if (hr != S_OK) {
			return ERR_CANT_OPEN;
		}
	} else {
		ERR_FAIL_COND_V(hr != S_OK, ERR_CANT_OPEN);
	}

	hr = audio_client->GetMixFormat(&pwfex);
	ERR_FAIL_COND_V(hr != S_OK, ERR_CANT_OPEN);

	// Since we're using WASAPI Shared Mode we can't control any of these, we just tag along
	wasapi_channels = pwfex->nChannels;
	format_tag = pwfex->wFormatTag;
	bits_per_sample = pwfex->wBitsPerSample;

	switch (wasapi_channels) {
		case 2: // Stereo
		case 4: // Surround 3.1
		case 6: // Surround 5.1
		case 8: // Surround 7.1
			channels = wasapi_channels;
			break;

		default:
			WARN_PRINTS("WASAPI: Unsupported number of channels: " + itos(wasapi_channels));
			channels = 2;
			break;
	}

	if (format_tag == WAVE_FORMAT_EXTENSIBLE) {
		WAVEFORMATEXTENSIBLE *wfex = (WAVEFORMATEXTENSIBLE *)pwfex;

		if (wfex->SubFormat == KSDATAFORMAT_SUBTYPE_PCM) {
			format_tag = WAVE_FORMAT_PCM;
		} else if (wfex->SubFormat == KSDATAFORMAT_SUBTYPE_IEEE_FLOAT) {
			format_tag = WAVE_FORMAT_IEEE_FLOAT;
		} else {
			ERR_PRINT("WASAPI: Format not supported");
			ERR_FAIL_V(ERR_CANT_OPEN);
		}
	} else {
		if (format_tag != WAVE_FORMAT_PCM && format_tag != WAVE_FORMAT_IEEE_FLOAT) {
			ERR_PRINT("WASAPI: Format not supported");
			ERR_FAIL_V(ERR_CANT_OPEN);
		}
	}

	DWORD streamflags = AUDCLNT_STREAMFLAGS_EVENTCALLBACK;
	if (mix_rate != pwfex->nSamplesPerSec) {
		streamflags |= AUDCLNT_STREAMFLAGS_RATEADJUST;
		pwfex->nSamplesPerSec = mix_rate;
		pwfex->nAvgBytesPerSec = pwfex->nSamplesPerSec * pwfex->nChannels * (pwfex->wBitsPerSample / 8);
	}

	hr = audio_client->Initialize(AUDCLNT_SHAREMODE_SHARED, streamflags, 0, 0, pwfex, NULL);
	ERR_FAIL_COND_V(hr != S_OK, ERR_CANT_OPEN);

	event = CreateEvent(NULL, FALSE, FALSE, NULL);
	ERR_FAIL_COND_V(event == NULL, ERR_CANT_OPEN);

	hr = audio_client->SetEventHandle(event);
	ERR_FAIL_COND_V(hr != S_OK, ERR_CANT_OPEN);

	hr = audio_client->GetService(IID_IAudioRenderClient, (void **)&render_client);
	ERR_FAIL_COND_V(hr != S_OK, ERR_CANT_OPEN);

	UINT32 max_frames;
	hr = audio_client->GetBufferSize(&max_frames);
	ERR_FAIL_COND_V(hr != S_OK, ERR_CANT_OPEN);

	// Due to WASAPI Shared Mode we have no control of the buffer size
	buffer_frames = max_frames;

	// Sample rate is independent of channels (ref: https://stackoverflow.com/questions/11048825/audio-sample-frequency-rely-on-channels)
	buffer_size = buffer_frames * channels;
	samples_in.resize(buffer_size);

	if (OS::get_singleton()->is_stdout_verbose()) {
		print_line("WASAPI: detected " + itos(channels) + " channels");
		print_line("WASAPI: audio buffer frames: " + itos(buffer_frames) + " calculated latency: " + itos(buffer_frames * 1000 / mix_rate) + "ms");
	}

	// Free memory
	CoTaskMemFree(pwfex);

	return OK;
}

StringName AudioDriverWASAPI::get_default_capture_device_name(IMMDeviceEnumerator *p_enumerator) {
	// Setup default device
	IMMDevice *default_device = NULL;
	LPWSTR pwszID = NULL;
	IPropertyStore *props = NULL;

	HRESULT hr = p_enumerator->GetDefaultAudioEndpoint(
			eCapture, eConsole, &default_device);
	ERR_FAIL_COND_V(hr != S_OK, "");

	// Get the device ID
	hr = default_device->GetId(&pwszID);
	ERR_FAIL_COND_V(hr != S_OK, "");

	// Get the device properties
	hr = default_device->OpenPropertyStore(
			STGM_READ, &props);
	ERR_FAIL_COND_V(hr != S_OK, "");

	PROPVARIANT var_name;
	PropVariantInit(&var_name);

	// Get the name of the device
	hr = props->GetValue(PKEY_Device_FriendlyName, &var_name);
	ERR_FAIL_COND_V(hr != S_OK, "");

	// Return the name of device
	return String(var_name.pwszVal);
}

Error AudioDriverWASAPI::init_capture_devices(bool reinit) {

	WAVEFORMATEX *pwfex;
	IMMDeviceEnumerator *enumerator = NULL;
	IMMDeviceCollection *device_collection = NULL;
	IPropertyStore *props = NULL;

	capture_device_id_map.clear();

	HRESULT hr = CoCreateInstance(CLSID_MMDeviceEnumerator, NULL, CLSCTX_ALL, IID_IMMDeviceEnumerator, (void **)&enumerator);
	ERR_FAIL_COND_V(hr != S_OK, ERR_CANT_OPEN);

	capture_device_default_name = get_default_capture_device_name(enumerator);

	// Enumerate a collection of valid devices
	hr = enumerator->EnumAudioEndpoints(eCapture, DEVICE_STATE_ACTIVE, &device_collection);
	ERR_FAIL_COND_V(hr != S_OK, ERR_CANT_OPEN);

	SAFE_RELEASE(enumerator);

	UINT count;
	hr = device_collection->GetCount(&count);
	ERR_FAIL_COND_V(hr != S_OK, ERR_CANT_OPEN);

	// Loop through the device count
	for (unsigned int i = 0; i < count; i++) {
		IMMDevice *device = NULL;
		LPWSTR pwszID = NULL;

		// Get the device
		hr = device_collection->Item(i, &device);
		ERR_FAIL_COND_V(hr != S_OK, ERR_CANT_OPEN);

		// Get the device ID
		hr = device->GetId(&pwszID);
		ERR_FAIL_COND_V(hr != S_OK, ERR_CANT_OPEN);

		// Get the device properties
		hr = device->OpenPropertyStore(STGM_READ, &props);
		ERR_FAIL_COND_V(hr != S_OK, ERR_CANT_OPEN);

		PROPVARIANT var_name;
		PropVariantInit(&var_name);

		// Get the name of the device
		hr = props->GetValue(PKEY_Device_FriendlyName, &var_name);
		ERR_FAIL_COND_V(hr != S_OK, ERR_CANT_OPEN);

		// Save the name of device
		StringName name = String(var_name.pwszVal);

		// DEBUG: print the device name and ID
		printf("Endpoint %d: \"%S\" (%S)\n", i, var_name.pwszVal, pwszID);

		capture_device_id_map[StringName(pwszID)] = name;

		// Cleanup the ID and properties
		CoTaskMemFree(pwszID);
		pwszID = NULL;
		PropVariantClear(&var_name);
		SAFE_RELEASE(props)

		// Create a new audio in block descriptor
		MicrophoneDeviceOutputDirectWASAPI *microphone_device_output_wasapi = memnew(MicrophoneDeviceOutputDirectWASAPI);
		microphone_device_output_wasapi->name = name;
		microphone_device_output_wasapi->active = false;

		// Push it into the list and assign it to the hash map for quick access
		microphone_device_outputs.push_back(microphone_device_output_wasapi);
		microphone_device_output_map[name] = microphone_device_output_wasapi;

		// Activate the device
		hr = device->Activate(IID_IAudioClient, CLSCTX_ALL, NULL, (void **)&microphone_device_output_wasapi->audio_client);
		SAFE_RELEASE(device)

		// Get the sample rate (hz)
		hr = microphone_device_output_wasapi->audio_client->GetMixFormat(&pwfex);
		ERR_FAIL_COND_V(hr != S_OK, ERR_CANT_OPEN);

		microphone_device_output_wasapi->channels = pwfex->nChannels;
		microphone_device_output_wasapi->mix_rate = pwfex->nSamplesPerSec;
		microphone_device_output_wasapi->bits_per_sample = pwfex->wBitsPerSample;
		microphone_device_output_wasapi->frame_size = (microphone_device_output_wasapi->bits_per_sample / 8) * microphone_device_output_wasapi->channels;

		microphone_device_output_wasapi->current_capture_index = 0;

		if (pwfex->wFormatTag == WAVE_FORMAT_EXTENSIBLE) {
			WAVEFORMATEXTENSIBLE *wfex = (WAVEFORMATEXTENSIBLE *)pwfex;

			if (wfex->SubFormat == KSDATAFORMAT_SUBTYPE_PCM) {
				microphone_device_output_wasapi->microphone_format = MicrophoneDeviceOutputDirect::FORMAT_PCM;
			} else if (wfex->SubFormat == KSDATAFORMAT_SUBTYPE_IEEE_FLOAT) {
				microphone_device_output_wasapi->microphone_format = MicrophoneDeviceOutputDirect::FORMAT_FLOAT;
			} else {
				ERR_PRINT("WASAPI: Format not supported");
				ERR_FAIL_V(ERR_CANT_OPEN);
			}
		} else {
			if (pwfex->wFormatTag != WAVE_FORMAT_PCM && pwfex->wFormatTag != WAVE_FORMAT_IEEE_FLOAT) {
				ERR_PRINT("WASAPI: Format not supported");
				ERR_FAIL_V(ERR_CANT_OPEN);
			} else {
				if (pwfex->wFormatTag == WAVE_FORMAT_PCM) {
					microphone_device_output_wasapi->microphone_format = MicrophoneDeviceOutputDirect::FORMAT_PCM;
				} else {
					microphone_device_output_wasapi->microphone_format = MicrophoneDeviceOutputDirect::FORMAT_FLOAT;
				}
			}
		}

		hr = microphone_device_output_wasapi->audio_client->Initialize(AUDCLNT_SHAREMODE_SHARED, 0, REFTIMES_PER_SEC, 0, pwfex, NULL);
		ERR_FAIL_COND_V(hr != S_OK, ERR_CANT_OPEN);

		// Get the max frames
		UINT32 max_frames;
		hr = microphone_device_output_wasapi->audio_client->GetBufferSize(&max_frames);
		ERR_FAIL_COND_V(hr != S_OK, ERR_CANT_OPEN);

		// Set the buffer size
		microphone_device_output_wasapi->buffer.resize(max_frames * 10); // 10 second test buffer (will crash after it's been filled due to lack of looping)
		memset(microphone_device_output_wasapi->buffer.ptrw(), 0x00, microphone_device_output_wasapi->buffer.size() * microphone_device_output_wasapi->frame_size);

		// Get the capture client
		hr = microphone_device_output_wasapi->audio_client->GetService(IID_IAudioCaptureClient, (void **)&microphone_device_output_wasapi->capture_client);
		ERR_FAIL_COND_V(hr != S_OK, ERR_CANT_OPEN);

		// TODO: set audio write stream to correct format
		REFERENCE_TIME hns_actual_duration = (double)REFTIMES_PER_SEC * max_frames / pwfex->nSamplesPerSec;

		// Free memory
		CoTaskMemFree(pwfex);
		SAFE_RELEASE(device)
	}
	SAFE_RELEASE(device_collection)

	return OK;
}

Error AudioDriverWASAPI::finish_render_device() {

	if (audio_client) {
		if (active) {
			audio_client->Stop();
			active = false;
		}

		audio_client->Release();
		audio_client = NULL;
	}

	SAFE_RELEASE(render_client)
	SAFE_RELEASE(audio_client)

	return OK;
}

Error AudioDriverWASAPI::finish_capture_devices() {

	microphone_device_output_map.clear();
	while (microphone_device_outputs.size() > 0) {
		MicrophoneDeviceOutputDirectWASAPI *microphone_device_output = static_cast<MicrophoneDeviceOutputDirectWASAPI *>(microphone_device_outputs.get(0));
		SAFE_RELEASE(microphone_device_output->capture_client)
		SAFE_RELEASE(microphone_device_output->audio_client)
		microphone_device_outputs.erase(microphone_device_output);
		memdelete(microphone_device_output);
	}

	return OK;
}

Error AudioDriverWASAPI::init() {

	mix_rate = GLOBAL_DEF_RST("audio/mix_rate", DEFAULT_MIX_RATE);

	Error err = init_render_device();
	if (err != OK) {
		ERR_PRINT("WASAPI: init_render_device error");
	}

	err = init_capture_devices();
	if (err != OK) {
		ERR_PRINT("WASAPI: init_capture_device error");
	}

	active = false;
	exit_thread = false;
	thread_exited = false;

	mutex = Mutex::create(true);
	thread = Thread::create(thread_func, this);

	return OK;
}

int AudioDriverWASAPI::get_mix_rate() const {

	return mix_rate;
}

AudioDriver::SpeakerMode AudioDriverWASAPI::get_speaker_mode() const {

	return get_speaker_mode_by_total_channels(channels);
}

Array AudioDriverWASAPI::get_device_list() {

	Array list;
	IMMDeviceCollection *devices = NULL;
	IMMDeviceEnumerator *enumerator = NULL;

	list.push_back(String("Default"));

	CoInitialize(NULL);

	HRESULT hr = CoCreateInstance(CLSID_MMDeviceEnumerator, NULL, CLSCTX_ALL, IID_IMMDeviceEnumerator, (void **)&enumerator);
	ERR_FAIL_COND_V(hr != S_OK, Array());

	hr = enumerator->EnumAudioEndpoints(eRender, DEVICE_STATE_ACTIVE, &devices);
	ERR_FAIL_COND_V(hr != S_OK, Array());

	UINT count = 0;
	hr = devices->GetCount(&count);
	ERR_FAIL_COND_V(hr != S_OK, Array());

	for (ULONG i = 0; i < count; i++) {
		IMMDevice *device = NULL;

		hr = devices->Item(i, &device);
		ERR_BREAK(hr != S_OK);

		IPropertyStore *props = NULL;
		hr = device->OpenPropertyStore(STGM_READ, &props);
		ERR_BREAK(hr != S_OK);

		PROPVARIANT propvar;
		PropVariantInit(&propvar);

		hr = props->GetValue(PKEY_Device_FriendlyName, &propvar);
		ERR_BREAK(hr != S_OK);

		list.push_back(String(propvar.pwszVal));

		PropVariantClear(&propvar);
		props->Release();
		device->Release();
	}

	devices->Release();
	enumerator->Release();
	return list;
}

String AudioDriverWASAPI::get_device() {

	return device_name;
}

void AudioDriverWASAPI::set_device(String device) {

	lock();
	new_device = device;
	unlock();
}

void AudioDriverWASAPI::write_sample(AudioDriverWASAPI *ad, BYTE *buffer, int i, int32_t sample) {
	if (ad->format_tag == WAVE_FORMAT_PCM) {
		switch (ad->bits_per_sample) {
			case 8:
				((int8_t *)buffer)[i] = sample >> 24;
				break;

			case 16:
				((int16_t *)buffer)[i] = sample >> 16;
				break;

			case 24:
				((int8_t *)buffer)[i * 3 + 2] = sample >> 24;
				((int8_t *)buffer)[i * 3 + 1] = sample >> 16;
				((int8_t *)buffer)[i * 3 + 0] = sample >> 8;
				break;

			case 32:
				((int32_t *)buffer)[i] = sample;
				break;
		}
	} else if (ad->format_tag == WAVE_FORMAT_IEEE_FLOAT) {
		((float *)buffer)[i] = (sample >> 16) / 32768.f;
	} else {
		ERR_PRINT("WASAPI: Unknown format tag");
		ad->exit_thread = true;
	}
}

void AudioDriverWASAPI::thread_func(void *p_udata) {

	AudioDriverWASAPI *ad = (AudioDriverWASAPI *)p_udata;

	while (!ad->exit_thread) {
		// Capture

		if (default_capture_device_changed) {
			if (ad->capture_device_id_map.has(capture_device_id)) {
				Map<StringName, StringName>::Element *e = ad->capture_device_id_map.find(capture_device_id);
				ad->lock();
				ad->start_counting_ticks();

				ad->capture_device_default_name = e->get();
				ad->update_microphone_default(ad->capture_device_default_name);

				default_capture_device_changed = false;

				ad->stop_counting_ticks();
				ad->unlock();
			}
		}

		for (int i = 0; i < ad->microphone_device_outputs.size(); i++) {
			MicrophoneDeviceOutputDirectWASAPI *microphone_device_output_wasapi = static_cast<MicrophoneDeviceOutputDirectWASAPI *>(ad->microphone_device_outputs[i]);

			if (microphone_device_output_wasapi->active == false) {
				continue;
			}

			UINT32 packet_length = 0;
			BYTE *data;
			UINT32 num_frames_available;
			DWORD flags;

			HRESULT hr = microphone_device_output_wasapi->capture_client->GetNextPacketSize(&packet_length);
			ERR_BREAK(hr != S_OK);

			while (packet_length != 0) {
				hr = microphone_device_output_wasapi->capture_client->GetBuffer(&data, &num_frames_available, &flags, NULL, NULL);
				ERR_BREAK(hr != S_OK);

				unsigned int frames_to_copy = num_frames_available;

				if (flags & AUDCLNT_BUFFERFLAGS_SILENT) {
					memset((char *)(microphone_device_output_wasapi->buffer.ptrw()) + (microphone_device_output_wasapi->current_capture_index * microphone_device_output_wasapi->frame_size), 0, frames_to_copy * microphone_device_output_wasapi->frame_size);
				} else {
					// fixme: Only works for floating point atm
					if (microphone_device_output_wasapi->channels == 2) {
						for (int j = 0; j < frames_to_copy; j++) {
							float left = *(((float *)data) + (j * 2));
							float right = *(((float *)data) + (j * 2) + 1);
							microphone_device_output_wasapi->buffer[microphone_device_output_wasapi->current_capture_index + j] = AudioFrame(left, right);
						}
					} else if (microphone_device_output_wasapi->channels == 1) {
						for (int j = 0; j < frames_to_copy; j++) {
							float value = *(((float *)data) + j);
							microphone_device_output_wasapi->buffer[microphone_device_output_wasapi->current_capture_index + j] = AudioFrame(value, value);
						}
					} else {
						ERR_PRINT("WASAPI: unsupported channel count in microphone!");
					}
				}

				hr = microphone_device_output_wasapi->capture_client->ReleaseBuffer(num_frames_available);
				ERR_BREAK(hr != S_OK);

				hr = microphone_device_output_wasapi->capture_client->GetNextPacketSize(&packet_length);
				ERR_BREAK(hr != S_OK);

				microphone_device_output_wasapi->current_capture_index += frames_to_copy;

				// Test: ensuring the read index is always behind the capture index keeps the input and output reliably in sync, but it
				// also results in clipping, stutter and other audio artefacts
				microphone_device_output_wasapi->set_read_index(microphone_device_output_wasapi->current_capture_index - 8192);
			}
		}

		ad->lock();
		ad->start_counting_ticks();

		if (ad->active) {
			ad->audio_server_process(ad->buffer_frames, ad->samples_in.ptrw());
		} else {
			for (unsigned int i = 0; i < ad->buffer_size; i++) {
				ad->samples_in.write[i] = 0;
			}
		}

		ad->stop_counting_ticks();
		ad->unlock();

		unsigned int left_frames = ad->buffer_frames;
		unsigned int buffer_idx = 0;
		while (left_frames > 0 && ad->audio_client) {
			WaitForSingleObject(ad->event, 1000);

			ad->lock();
			ad->start_counting_ticks();

			UINT32 cur_frames;
			bool invalidated = false;
			HRESULT hr = ad->audio_client->GetCurrentPadding(&cur_frames);
			if (hr == S_OK) {
				// Check how much frames are available on the WASAPI buffer
				UINT32 avail_frames = ad->buffer_frames - cur_frames;
				UINT32 write_frames = avail_frames > left_frames ? left_frames : avail_frames;

				BYTE *buffer = NULL;
				hr = ad->render_client->GetBuffer(write_frames, &buffer);
				if (hr == S_OK) {
					// We're using WASAPI Shared Mode so we must convert the buffer

					if (ad->channels == ad->wasapi_channels) {
						for (unsigned int i = 0; i < write_frames * ad->channels; i++) {
							ad->write_sample(ad, buffer, i, ad->samples_in[buffer_idx++]);
						}
					} else {
						for (unsigned int i = 0; i < write_frames; i++) {
							for (unsigned int j = 0; j < MIN(ad->channels, ad->wasapi_channels); j++) {
								ad->write_sample(ad, buffer, i * ad->wasapi_channels + j, ad->samples_in[buffer_idx++]);
							}
							if (ad->wasapi_channels > ad->channels) {
								for (unsigned int j = ad->channels; j < ad->wasapi_channels; j++) {
									ad->write_sample(ad, buffer, i * ad->wasapi_channels + j, 0);
								}
							}
						}
					}

					hr = ad->render_client->ReleaseBuffer(write_frames, 0);
					if (hr != S_OK) {
						ERR_PRINT("WASAPI: Release buffer error");
					}

					left_frames -= write_frames;
				} else if (hr == AUDCLNT_E_DEVICE_INVALIDATED) {
					invalidated = true;
				} else {
					ERR_PRINT("WASAPI: Get buffer error");
					ad->exit_thread = true;
				}
			} else if (hr == AUDCLNT_E_DEVICE_INVALIDATED) {
				invalidated = true;
			} else {
				ERR_PRINT("WASAPI: GetCurrentPadding error");
			}

			if (invalidated) {
				// Device is not valid anymore
				WARN_PRINT("WASAPI: Current device invalidated, closing device");

				Error err = ad->finish_render_device();
				if (err != OK) {
					ERR_PRINT("WASAPI: finish_render_device error");
				}
			}

			ad->stop_counting_ticks();
			ad->unlock();
		}

		ad->lock();
		ad->start_counting_ticks();

		// If we're using the Default device and it changed finish it so we'll re-init the device
		if (ad->device_name == "Default" && default_render_device_changed) {
			Error err = ad->finish_render_device();
			if (err != OK) {
				ERR_PRINT("WASAPI: finish_render_device error");
			}

			default_render_device_changed = false;
		}

		// User selected a new device, finish the current one so we'll init the new device
		if (ad->device_name != ad->new_device) {
			ad->device_name = ad->new_device;
			Error err = ad->finish_render_device();
			if (err != OK) {
				ERR_PRINT("WASAPI: finish_render_device error");
			}
		}

		if (!ad->audio_client) {
			Error err = ad->init_render_device(true);
			if (err == OK) {
				ad->start();
			}
		}

		ad->stop_counting_ticks();
		ad->unlock();
	}

	ad->thread_exited = true;
}

void AudioDriverWASAPI::start() {

	if (audio_client) {
		HRESULT hr = audio_client->Start();
		if (hr != S_OK) {
			ERR_PRINT("WASAPI: Start failed");
		} else {
			active = true;
		}
	}
}

void AudioDriverWASAPI::lock() {

	if (mutex)
		mutex->lock();
}

void AudioDriverWASAPI::unlock() {

	if (mutex)
		mutex->unlock();
}

void AudioDriverWASAPI::finish() {

	if (thread) {
		exit_thread = true;
		Thread::wait_to_finish(thread);

		memdelete(thread);
		thread = NULL;
	}

	finish_capture_devices();
	finish_render_device();

	if (mutex) {
		memdelete(mutex);
		mutex = NULL;
	}
}

bool AudioDriverWASAPI::capture_device_start(StringName p_name) {

	if (microphone_device_output_map.has(p_name)) {
		MicrophoneDeviceOutputDirectWASAPI *microphone_device_output_wasapi = static_cast<MicrophoneDeviceOutputDirectWASAPI *>(microphone_device_output_map[p_name]);
		if (microphone_device_output_wasapi->active == false) {
			microphone_device_output_wasapi->audio_client->Start();
			microphone_device_output_wasapi->active = true;
			microphone_device_output_wasapi->set_read_index(-2048);
		}

		return true;
	}

	return false;
}

bool AudioDriverWASAPI::capture_device_stop(StringName p_name) {

	if (microphone_device_output_map.has(p_name)) {
		MicrophoneDeviceOutputDirectWASAPI *microphone_device_output_wasapi = static_cast<MicrophoneDeviceOutputDirectWASAPI *>(microphone_device_output_map[p_name]);
		if (microphone_device_output_wasapi->active == true) {
			microphone_device_output_wasapi->audio_client->Stop();
			microphone_device_output_wasapi->active = false;
		}

		return true;
	}

	return false;
}

PoolStringArray AudioDriverWASAPI::capture_device_get_names() {

	PoolStringArray names;

	for (int i = 0; i < microphone_device_outputs.size(); i++) {
		MicrophoneDeviceOutputDirectWASAPI *microphone_device_output_wasapi = static_cast<MicrophoneDeviceOutputDirectWASAPI *>(microphone_device_outputs.get(i));
		names.push_back(microphone_device_output_wasapi->name);
	}

	return names;
}

StringName AudioDriverWASAPI::capture_device_get_default_name() {

	lock();
	StringName capture_device_default_name_local = capture_device_default_name;
	unlock();

	return capture_device_default_name_local;
}

AudioDriverWASAPI::AudioDriverWASAPI() {

	audio_client = NULL;
	render_client = NULL;
	mutex = NULL;
	thread = NULL;

	format_tag = 0;
	bits_per_sample = 0;

	samples_in.clear();

	buffer_size = 0;
	channels = 0;
	wasapi_channels = 0;
	mix_rate = 0;
	buffer_frames = 0;

	thread_exited = false;
	exit_thread = false;
	active = false;

	device_name = "Default";
	new_device = "Default";
	capture_device_default_name = "";
}

#endif