Move backend sources to a separate sub-directory

1 files changed, 775 insertions, 0 deletions

diff --git a/Alc/backends/mmdevapi.c b/Alc/backends/mmdevapi.c
new file mode 100644
index 00000000..702569c6
--- /dev/null
+++ b/Alc/backends/mmdevapi.c
@@ -0,0 +1,775 @@
+/**
+ * OpenAL cross platform audio library
+ * Copyright (C) 2011 by authors.
+ * This library is free software; you can redistribute it and/or
+ *  modify it under the terms of the GNU Library General Public
+ *  License as published by the Free Software Foundation; either
+ *  version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ *  Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public
+ *  License along with this library; if not, write to the
+ *  Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ *  Boston, MA  02111-1307, USA.
+ * Or go to http://www.gnu.org/copyleft/lgpl.html
+ */
+
+#include "config.h"
+
+#define COBJMACROS
+#define _WIN32_WINNT 0x0500
+#include <stdlib.h>
+#include <stdio.h>
+#include <memory.h>
+
+#include <mmdeviceapi.h>
+#include <audioclient.h>
+#include <cguid.h>
+#include <mmreg.h>
+#ifndef _WAVEFORMATEXTENSIBLE_
+#include <ks.h>
+#include <ksmedia.h>
+#endif
+
+#include "alMain.h"
+#include "AL/al.h"
+#include "AL/alc.h"
+
+
+DEFINE_GUID(KSDATAFORMAT_SUBTYPE_PCM, 0x00000001, 0x0000, 0x0010, 0x80, 0x00, 0x00, 0xaa, 0x00, 0x38, 0x9b, 0x71);
+DEFINE_GUID(KSDATAFORMAT_SUBTYPE_IEEE_FLOAT, 0x00000003, 0x0000, 0x0010, 0x80, 0x00, 0x00, 0xaa, 0x00, 0x38, 0x9b, 0x71);
+
+#define MONO SPEAKER_FRONT_CENTER
+#define STEREO (SPEAKER_FRONT_LEFT|SPEAKER_FRONT_RIGHT)
+#define QUAD (SPEAKER_FRONT_LEFT|SPEAKER_FRONT_RIGHT|SPEAKER_BACK_LEFT|SPEAKER_BACK_RIGHT)
+#define X5DOT1 (SPEAKER_FRONT_LEFT|SPEAKER_FRONT_RIGHT|SPEAKER_FRONT_CENTER|SPEAKER_LOW_FREQUENCY|SPEAKER_BACK_LEFT|SPEAKER_BACK_RIGHT)
+#define X5DOT1SIDE (SPEAKER_FRONT_LEFT|SPEAKER_FRONT_RIGHT|SPEAKER_FRONT_CENTER|SPEAKER_LOW_FREQUENCY|SPEAKER_SIDE_LEFT|SPEAKER_SIDE_RIGHT)
+#define X6DOT1 (SPEAKER_FRONT_LEFT|SPEAKER_FRONT_RIGHT|SPEAKER_FRONT_CENTER|SPEAKER_LOW_FREQUENCY|SPEAKER_BACK_CENTER|SPEAKER_SIDE_LEFT|SPEAKER_SIDE_RIGHT)
+#define X7DOT1 (SPEAKER_FRONT_LEFT|SPEAKER_FRONT_RIGHT|SPEAKER_FRONT_CENTER|SPEAKER_LOW_FREQUENCY|SPEAKER_BACK_LEFT|SPEAKER_BACK_RIGHT|SPEAKER_SIDE_LEFT|SPEAKER_SIDE_RIGHT)
+
+
+typedef struct {
+    IMMDevice *mmdev;
+    IAudioClient *client;
+    HANDLE hNotifyEvent;
+
+    HANDLE MsgEvent;
+
+    volatile int killNow;
+    ALvoid *thread;
+} MMDevApiData;
+
+
+static const ALCchar mmDevice[] = "WASAPI Default";
+
+
+static HANDLE ThreadHdl;
+static DWORD ThreadID;
+
+typedef struct {
+    HANDLE FinishedEvt;
+    HRESULT result;
+} ThreadRequest;
+
+#define WM_USER_OpenDevice  (WM_USER+0)
+#define WM_USER_ResetDevice (WM_USER+1)
+#define WM_USER_StopDevice  (WM_USER+2)
+#define WM_USER_CloseDevice (WM_USER+3)
+
+static HRESULT WaitForResponse(ThreadRequest *req)
+{
+    if(WaitForSingleObject(req->FinishedEvt, INFINITE) == WAIT_OBJECT_0)
+        return req->result;
+    ERR("Message response error: %lu\n", GetLastError());
+    return E_FAIL;
+}
+
+
+static ALuint MMDevApiProc(ALvoid *ptr)
+{
+    ALCdevice *device = ptr;
+    MMDevApiData *data = device->ExtraData;
+    union {
+        IAudioRenderClient *iface;
+        void *ptr;
+    } render;
+    UINT32 written, len;
+    BYTE *buffer;
+    HRESULT hr;
+
+    hr = CoInitialize(NULL);
+    if(FAILED(hr))
+    {
+        ERR("CoInitialize(NULL) failed: 0x%08lx\n", hr);
+        aluHandleDisconnect(device);
+        return 0;
+    }
+
+    hr = IAudioClient_GetService(data->client, &IID_IAudioRenderClient, &render.ptr);
+    if(FAILED(hr))
+    {
+        ERR("Failed to get AudioRenderClient service: 0x%08lx\n", hr);
+        aluHandleDisconnect(device);
+        return 0;
+    }
+
+    SetRTPriority();
+
+    while(!data->killNow)
+    {
+        hr = IAudioClient_GetCurrentPadding(data->client, &written);
+        if(FAILED(hr))
+        {
+            ERR("Failed to get padding: 0x%08lx\n", hr);
+            aluHandleDisconnect(device);
+            break;
+        }
+
+        len = device->UpdateSize*device->NumUpdates - written;
+        if(len < device->UpdateSize)
+        {
+            DWORD res;
+            res = WaitForSingleObjectEx(data->hNotifyEvent, 2000, FALSE);
+            if(res != WAIT_OBJECT_0)
+                ERR("WaitForSingleObjectEx error: 0x%lx\n", res);
+            continue;
+        }
+        len -= len%device->UpdateSize;
+
+        hr = IAudioRenderClient_GetBuffer(render.iface, len, &buffer);
+        if(SUCCEEDED(hr))
+        {
+            aluMixData(device, buffer, len);
+            hr = IAudioRenderClient_ReleaseBuffer(render.iface, len, 0);
+        }
+        if(FAILED(hr))
+        {
+            ERR("Failed to buffer data: 0x%08lx\n", hr);
+            aluHandleDisconnect(device);
+            break;
+        }
+    }
+
+    IAudioRenderClient_Release(render.iface);
+
+    CoUninitialize();
+    return 0;
+}
+
+
+static ALCboolean MakeExtensible(WAVEFORMATEXTENSIBLE *out, const WAVEFORMATEX *in)
+{
+    memset(out, 0, sizeof(*out));
+    if(in->wFormatTag == WAVE_FORMAT_EXTENSIBLE)
+        *out = *(WAVEFORMATEXTENSIBLE*)in;
+    else if(in->wFormatTag == WAVE_FORMAT_PCM)
+    {
+        out->Format = *in;
+        out->Format.wFormatTag = WAVE_FORMAT_EXTENSIBLE;
+        out->Format.cbSize = sizeof(*out) - sizeof(*in);
+        if(out->Format.nChannels == 1)
+            out->dwChannelMask = MONO;
+        else if(out->Format.nChannels == 2)
+            out->dwChannelMask = STEREO;
+        else
+            ERR("Unhandled PCM channel count: %d\n", out->Format.nChannels);
+        out->SubFormat = KSDATAFORMAT_SUBTYPE_PCM;
+    }
+    else if(in->wFormatTag == WAVE_FORMAT_IEEE_FLOAT)
+    {
+        out->Format = *in;
+        out->Format.wFormatTag = WAVE_FORMAT_EXTENSIBLE;
+        out->Format.cbSize = sizeof(*out) - sizeof(*in);
+        if(out->Format.nChannels == 1)
+            out->dwChannelMask = MONO;
+        else if(out->Format.nChannels == 2)
+            out->dwChannelMask = STEREO;
+        else
+            ERR("Unhandled IEEE float channel count: %d\n", out->Format.nChannels);
+        out->SubFormat = KSDATAFORMAT_SUBTYPE_IEEE_FLOAT;
+    }
+    else
+    {
+        ERR("Unhandled format tag: 0x%04x\n", in->wFormatTag);
+        return ALC_FALSE;
+    }
+    return ALC_TRUE;
+}
+
+static HRESULT DoReset(ALCdevice *device)
+{
+    MMDevApiData *data = device->ExtraData;
+    WAVEFORMATEXTENSIBLE OutputType;
+    WAVEFORMATEX *wfx = NULL;
+    REFERENCE_TIME min_per;
+    UINT32 buffer_len, min_len;
+    HRESULT hr;
+
+    hr = IAudioClient_GetMixFormat(data->client, &wfx);
+    if(FAILED(hr))
+    {
+        ERR("Failed to get mix format: 0x%08lx\n", hr);
+        return hr;
+    }
+
+    if(!MakeExtensible(&OutputType, wfx))
+    {
+        CoTaskMemFree(wfx);
+        return E_FAIL;
+    }
+    CoTaskMemFree(wfx);
+    wfx = NULL;
+
+    if(!(device->Flags&DEVICE_FREQUENCY_REQUEST))
+        device->Frequency = OutputType.Format.nSamplesPerSec;
+    if(!(device->Flags&DEVICE_CHANNELS_REQUEST))
+    {
+        if(OutputType.Format.nChannels == 1 && OutputType.dwChannelMask == MONO)
+            device->FmtChans = DevFmtMono;
+        else if(OutputType.Format.nChannels == 2 && OutputType.dwChannelMask == STEREO)
+            device->FmtChans = DevFmtStereo;
+        else if(OutputType.Format.nChannels == 4 && OutputType.dwChannelMask == QUAD)
+            device->FmtChans = DevFmtQuad;
+        else if(OutputType.Format.nChannels == 6 && OutputType.dwChannelMask == X5DOT1)
+            device->FmtChans = DevFmtX51;
+        else if(OutputType.Format.nChannels == 6 && OutputType.dwChannelMask == X5DOT1SIDE)
+            device->FmtChans = DevFmtX51Side;
+        else if(OutputType.Format.nChannels == 7 && OutputType.dwChannelMask == X6DOT1)
+            device->FmtChans = DevFmtX61;
+        else if(OutputType.Format.nChannels == 8 && OutputType.dwChannelMask == X7DOT1)
+            device->FmtChans = DevFmtX71;
+        else
+            ERR("Unhandled channel config: %d -- 0x%08lx\n", OutputType.Format.nChannels, OutputType.dwChannelMask);
+    }
+
+    switch(device->FmtChans)
+    {
+        case DevFmtMono:
+            OutputType.Format.nChannels = 1;
+            OutputType.dwChannelMask = MONO;
+            break;
+        case DevFmtStereo:
+            OutputType.Format.nChannels = 2;
+            OutputType.dwChannelMask = STEREO;
+            break;
+        case DevFmtQuad:
+            OutputType.Format.nChannels = 4;
+            OutputType.dwChannelMask = QUAD;
+            break;
+        case DevFmtX51:
+            OutputType.Format.nChannels = 6;
+            OutputType.dwChannelMask = X5DOT1;
+            break;
+        case DevFmtX51Side:
+            OutputType.Format.nChannels = 6;
+            OutputType.dwChannelMask = X5DOT1SIDE;
+            break;
+        case DevFmtX61:
+            OutputType.Format.nChannels = 7;
+            OutputType.dwChannelMask = X6DOT1;
+            break;
+        case DevFmtX71:
+            OutputType.Format.nChannels = 8;
+            OutputType.dwChannelMask = X7DOT1;
+            break;
+    }
+    switch(device->FmtType)
+    {
+        case DevFmtByte:
+            device->FmtType = DevFmtUByte;
+            /* fall-through */
+        case DevFmtUByte:
+            OutputType.Format.wBitsPerSample = 8;
+            OutputType.Samples.wValidBitsPerSample = 8;
+            OutputType.SubFormat = KSDATAFORMAT_SUBTYPE_PCM;
+            break;
+        case DevFmtUShort:
+            device->FmtType = DevFmtShort;
+            /* fall-through */
+        case DevFmtShort:
+            OutputType.Format.wBitsPerSample = 16;
+            OutputType.Samples.wValidBitsPerSample = 16;
+            OutputType.SubFormat = KSDATAFORMAT_SUBTYPE_PCM;
+            break;
+        case DevFmtFloat:
+            OutputType.Format.wBitsPerSample = 32;
+            OutputType.Samples.wValidBitsPerSample = 32;
+            OutputType.SubFormat = KSDATAFORMAT_SUBTYPE_IEEE_FLOAT;
+            break;
+    }
+    OutputType.Format.nSamplesPerSec = device->Frequency;
+
+    OutputType.Format.nBlockAlign = OutputType.Format.nChannels *
+                                    OutputType.Format.wBitsPerSample / 8;
+    OutputType.Format.nAvgBytesPerSec = OutputType.Format.nSamplesPerSec *
+                                        OutputType.Format.nBlockAlign;
+
+    hr = IAudioClient_IsFormatSupported(data->client, AUDCLNT_SHAREMODE_SHARED, &OutputType.Format, &wfx);
+    if(FAILED(hr))
+    {
+        ERR("Failed to check format support: 0x%08lx\n", hr);
+        hr = IAudioClient_GetMixFormat(data->client, &wfx);
+    }
+    if(FAILED(hr))
+    {
+        ERR("Failed to find a supported format: 0x%08lx\n", hr);
+        return hr;
+    }
+
+    if(wfx != NULL)
+    {
+        if(!MakeExtensible(&OutputType, wfx))
+        {
+            CoTaskMemFree(wfx);
+            return E_FAIL;
+        }
+        CoTaskMemFree(wfx);
+        wfx = NULL;
+
+        if(device->Frequency != OutputType.Format.nSamplesPerSec)
+        {
+            if((device->Flags&DEVICE_FREQUENCY_REQUEST))
+                ERR("Failed to set %dhz, got %ldhz instead\n", device->Frequency, OutputType.Format.nSamplesPerSec);
+            device->Flags &= ~DEVICE_FREQUENCY_REQUEST;
+            device->Frequency = OutputType.Format.nSamplesPerSec;
+        }
+
+        if(!((device->FmtChans == DevFmtMono && OutputType.Format.nChannels == 1 && OutputType.dwChannelMask == MONO) ||
+             (device->FmtChans == DevFmtStereo && OutputType.Format.nChannels == 2 && OutputType.dwChannelMask == STEREO) ||
+             (device->FmtChans == DevFmtQuad && OutputType.Format.nChannels == 4 && OutputType.dwChannelMask == QUAD) ||
+             (device->FmtChans == DevFmtX51 && OutputType.Format.nChannels == 6 && OutputType.dwChannelMask == X5DOT1) ||
+             (device->FmtChans == DevFmtX51Side && OutputType.Format.nChannels == 6 && OutputType.dwChannelMask == X5DOT1SIDE) ||
+             (device->FmtChans == DevFmtX61 && OutputType.Format.nChannels == 7 && OutputType.dwChannelMask == X6DOT1) ||
+             (device->FmtChans == DevFmtX71 && OutputType.Format.nChannels == 8 && OutputType.dwChannelMask == X7DOT1)))
+        {
+            if((device->Flags&DEVICE_CHANNELS_REQUEST))
+                ERR("Failed to set %s, got %d channels (0x%08lx) instead\n", DevFmtChannelsString(device->FmtChans), OutputType.Format.nChannels, OutputType.dwChannelMask);
+            device->Flags &= ~DEVICE_CHANNELS_REQUEST;
+
+            if(OutputType.Format.nChannels == 1 && OutputType.dwChannelMask == MONO)
+                device->FmtChans = DevFmtMono;
+            else if(OutputType.Format.nChannels == 2 && OutputType.dwChannelMask == STEREO)
+                device->FmtChans = DevFmtStereo;
+            else if(OutputType.Format.nChannels == 4 && OutputType.dwChannelMask == QUAD)
+                device->FmtChans = DevFmtQuad;
+            else if(OutputType.Format.nChannels == 6 && OutputType.dwChannelMask == X5DOT1)
+                device->FmtChans = DevFmtX51;
+            else if(OutputType.Format.nChannels == 6 && OutputType.dwChannelMask == X5DOT1SIDE)
+                device->FmtChans = DevFmtX51Side;
+            else if(OutputType.Format.nChannels == 7 && OutputType.dwChannelMask == X6DOT1)
+                device->FmtChans = DevFmtX61;
+            else if(OutputType.Format.nChannels == 8 && OutputType.dwChannelMask == X7DOT1)
+                device->FmtChans = DevFmtX71;
+            else
+            {
+                ERR("Unhandled extensible channels: %d -- 0x%08lx\n", OutputType.Format.nChannels, OutputType.dwChannelMask);
+                device->FmtChans = DevFmtStereo;
+                OutputType.Format.nChannels = 2;
+                OutputType.dwChannelMask = STEREO;
+            }
+        }
+
+        if(IsEqualGUID(&OutputType.SubFormat, &KSDATAFORMAT_SUBTYPE_PCM))
+        {
+            if(OutputType.Samples.wValidBitsPerSample == 0)
+                OutputType.Samples.wValidBitsPerSample = OutputType.Format.wBitsPerSample;
+            if(OutputType.Samples.wValidBitsPerSample != OutputType.Format.wBitsPerSample ||
+               !((device->FmtType == DevFmtUByte && OutputType.Format.wBitsPerSample == 8) ||
+                 (device->FmtType == DevFmtShort && OutputType.Format.wBitsPerSample == 16)))
+            {
+                ERR("Failed to set %s samples, got %d/%d-bit instead\n", DevFmtTypeString(device->FmtType), OutputType.Samples.wValidBitsPerSample, OutputType.Format.wBitsPerSample);
+                if(OutputType.Format.wBitsPerSample == 8)
+                    device->FmtType = DevFmtUByte;
+                else if(OutputType.Format.wBitsPerSample == 16)
+                    device->FmtType = DevFmtShort;
+                else
+                {
+                    device->FmtType = DevFmtShort;
+                    OutputType.Format.wBitsPerSample = 16;
+                }
+                OutputType.Samples.wValidBitsPerSample = OutputType.Format.wBitsPerSample;
+            }
+        }
+        else if(IsEqualGUID(&OutputType.SubFormat, &KSDATAFORMAT_SUBTYPE_IEEE_FLOAT))
+        {
+            if(OutputType.Samples.wValidBitsPerSample == 0)
+                OutputType.Samples.wValidBitsPerSample = OutputType.Format.wBitsPerSample;
+            if(OutputType.Samples.wValidBitsPerSample != OutputType.Format.wBitsPerSample ||
+               !((device->FmtType == DevFmtFloat && OutputType.Format.wBitsPerSample == 32)))
+            {
+                ERR("Failed to set %s samples, got %d/%d-bit instead\n", DevFmtTypeString(device->FmtType), OutputType.Samples.wValidBitsPerSample, OutputType.Format.wBitsPerSample);
+                if(OutputType.Format.wBitsPerSample != 32)
+                {
+                    device->FmtType = DevFmtFloat;
+                    OutputType.Format.wBitsPerSample = 32;
+                }
+                OutputType.Samples.wValidBitsPerSample = OutputType.Format.wBitsPerSample;
+            }
+        }
+        else
+        {
+            ERR("Unhandled format sub-type\n");
+            device->FmtType = DevFmtShort;
+            OutputType.Format.wBitsPerSample = 16;
+            OutputType.Samples.wValidBitsPerSample = OutputType.Format.wBitsPerSample;
+            OutputType.SubFormat = KSDATAFORMAT_SUBTYPE_PCM;
+        }
+    }
+
+    SetDefaultWFXChannelOrder(device);
+
+    hr = IAudioClient_GetDevicePeriod(data->client, &min_per, NULL);
+    if(SUCCEEDED(hr))
+    {
+        min_len = (min_per*device->Frequency + 10000000-1) / 10000000;
+        if(min_len < device->UpdateSize)
+            min_len *= (device->UpdateSize + min_len/2)/min_len;
+
+        device->NumUpdates = (device->NumUpdates*device->UpdateSize + min_len/2) /
+                             min_len;
+        device->NumUpdates = maxu(device->NumUpdates, 2);
+        device->UpdateSize = min_len;
+
+        hr = IAudioClient_Initialize(data->client, AUDCLNT_SHAREMODE_SHARED,
+                                     AUDCLNT_STREAMFLAGS_EVENTCALLBACK,
+                                     ((REFERENCE_TIME)device->UpdateSize*
+                                      device->NumUpdates*10000000 +
+                                      device->Frequency-1) / device->Frequency,
+                                     0, &OutputType.Format, NULL);
+    }
+    if(FAILED(hr))
+    {
+        ERR("Failed to initialize audio client: 0x%08lx\n", hr);
+        return hr;
+    }
+
+    hr = IAudioClient_GetBufferSize(data->client, &buffer_len);
+    if(FAILED(hr))
+    {
+        ERR("Failed to get audio buffer info: 0x%08lx\n", hr);
+        return hr;
+    }
+
+    device->NumUpdates = buffer_len / device->UpdateSize;
+    if(device->NumUpdates <= 1)
+    {
+        device->NumUpdates = 1;
+        ERR("Audio client returned buffer_len < period*2; expect break up\n");
+    }
+
+    ResetEvent(data->hNotifyEvent);
+    hr = IAudioClient_SetEventHandle(data->client, data->hNotifyEvent);
+    if(SUCCEEDED(hr))
+        hr = IAudioClient_Start(data->client);
+    if(FAILED(hr))
+    {
+        ERR("Failed to start audio client: 0x%08lx\n", hr);
+        return hr;
+    }
+
+    data->thread = StartThread(MMDevApiProc, device);
+    if(!data->thread)
+    {
+        IAudioClient_Stop(data->client);
+        ERR("Failed to start thread\n");
+        return E_FAIL;
+    }
+
+    return hr;
+}
+
+
+static DWORD CALLBACK MessageProc(void *ptr)
+{
+    ThreadRequest *req = ptr;
+    IMMDeviceEnumerator *Enumerator;
+    MMDevApiData *data;
+    ALCdevice *device;
+    HRESULT hr;
+    MSG msg;
+
+    TRACE("Starting message thread\n");
+
+    hr = CoInitialize(NULL);
+    if(FAILED(hr))
+    {
+        WARN("Failed to initialize COM: 0x%08lx\n", hr);
+        req->result = hr;
+        SetEvent(req->FinishedEvt);
+        return 0;
+    }
+
+    hr = CoCreateInstance(&CLSID_MMDeviceEnumerator, NULL, CLSCTX_INPROC_SERVER, &IID_IMMDeviceEnumerator, &ptr);
+    if(FAILED(hr))
+    {
+        WARN("Failed to create IMMDeviceEnumerator instance: 0x%08lx\n", hr);
+        CoUninitialize();
+        req->result = hr;
+        SetEvent(req->FinishedEvt);
+        return 0;
+    }
+    Enumerator = ptr;
+    IMMDeviceEnumerator_Release(Enumerator);
+    Enumerator = NULL;
+
+    req->result = S_OK;
+    SetEvent(req->FinishedEvt);
+
+    TRACE("Starting message loop\n");
+    while(GetMessage(&msg, NULL, 0, 0))
+    {
+        TRACE("Got message %u\n", msg.message);
+        switch(msg.message)
+        {
+        case WM_USER_OpenDevice:
+            req = (ThreadRequest*)msg.wParam;
+            device = (ALCdevice*)msg.lParam;
+            data = device->ExtraData;
+
+            hr = CoCreateInstance(&CLSID_MMDeviceEnumerator, NULL, CLSCTX_INPROC_SERVER, &IID_IMMDeviceEnumerator, &ptr);
+            if(SUCCEEDED(hr))
+            {
+                Enumerator = ptr;
+                hr = IMMDeviceEnumerator_GetDefaultAudioEndpoint(Enumerator, eRender, eMultimedia, &data->mmdev);
+                IMMDeviceEnumerator_Release(Enumerator);
+                Enumerator = NULL;
+            }
+            if(SUCCEEDED(hr))
+                hr = IMMDevice_Activate(data->mmdev, &IID_IAudioClient, CLSCTX_INPROC_SERVER, NULL, &ptr);
+            if(SUCCEEDED(hr))
+                data->client = ptr;
+
+            if(FAILED(hr))
+            {
+                if(data->mmdev)
+                    IMMDevice_Release(data->mmdev);
+                data->mmdev = NULL;
+            }
+
+            req->result = hr;
+            SetEvent(req->FinishedEvt);
+            continue;
+
+        case WM_USER_ResetDevice:
+            req = (ThreadRequest*)msg.wParam;
+            device = (ALCdevice*)msg.lParam;
+
+            req->result = DoReset(device);
+            SetEvent(req->FinishedEvt);
+            continue;
+
+        case WM_USER_StopDevice:
+            req = (ThreadRequest*)msg.wParam;
+            device = (ALCdevice*)msg.lParam;
+            data = device->ExtraData;
+
+            if(data->thread)
+            {
+                data->killNow = 1;
+                StopThread(data->thread);
+                data->thread = NULL;
+
+                data->killNow = 0;
+
+                IAudioClient_Stop(data->client);
+            }
+
+            req->result = S_OK;
+            SetEvent(req->FinishedEvt);
+            continue;
+
+        case WM_USER_CloseDevice:
+            req = (ThreadRequest*)msg.wParam;
+            device = (ALCdevice*)msg.lParam;
+            data = device->ExtraData;
+
+            IAudioClient_Release(data->client);
+            data->client = NULL;
+
+            IMMDevice_Release(data->mmdev);
+            data->mmdev = NULL;
+
+            req->result = S_OK;
+            SetEvent(req->FinishedEvt);
+            continue;
+
+        default:
+            ERR("Unexpected message: %u\n", msg.message);
+            continue;
+        }
+    }
+    TRACE("Message loop finished\n");
+
+    CoUninitialize();
+    return 0;
+}
+
+
+static BOOL MMDevApiLoad(void)
+{
+    static HRESULT InitResult;
+    if(!ThreadHdl)
+    {
+        ThreadRequest req;
+        InitResult = E_FAIL;
+
+        req.FinishedEvt = CreateEvent(NULL, FALSE, FALSE, NULL);
+        if(req.FinishedEvt == NULL)
+            ERR("Failed to create event: %lu\n", GetLastError());
+        else
+        {
+            ThreadHdl = CreateThread(NULL, 0, MessageProc, &req, 0, &ThreadID);
+            if(ThreadHdl != NULL)
+                InitResult = WaitForResponse(&req);
+            CloseHandle(req.FinishedEvt);
+        }
+    }
+    return SUCCEEDED(InitResult);
+}
+
+
+static ALCboolean MMDevApiOpenPlayback(ALCdevice *device, const ALCchar *deviceName)
+{
+    MMDevApiData *data = NULL;
+    HRESULT hr;
+
+    if(!deviceName)
+        deviceName = mmDevice;
+    else if(strcmp(deviceName, mmDevice) != 0)
+        return ALC_FALSE;
+
+    //Initialise requested device
+    data = calloc(1, sizeof(MMDevApiData));
+    if(!data)
+    {
+        alcSetError(device, ALC_OUT_OF_MEMORY);
+        return ALC_FALSE;
+    }
+    device->ExtraData = data;
+
+    hr = S_OK;
+    data->hNotifyEvent = CreateEvent(NULL, FALSE, FALSE, NULL);
+    data->MsgEvent = CreateEvent(NULL, FALSE, FALSE, NULL);
+    if(data->hNotifyEvent == NULL || data->MsgEvent == NULL)
+        hr = E_FAIL;
+
+    if(SUCCEEDED(hr))
+    {
+        ThreadRequest req = { data->MsgEvent, 0 };
+
+        hr = E_FAIL;
+        if(PostThreadMessage(ThreadID, WM_USER_OpenDevice, (WPARAM)&req, (LPARAM)device))
+            hr = WaitForResponse(&req);
+    }
+
+    if(FAILED(hr))
+    {
+        if(data->hNotifyEvent != NULL)
+            CloseHandle(data->hNotifyEvent);
+        data->hNotifyEvent = NULL;
+        if(data->MsgEvent != NULL)
+            CloseHandle(data->MsgEvent);
+        data->MsgEvent = NULL;
+
+        free(data);
+        device->ExtraData = NULL;
+
+        ERR("Device init failed: 0x%08lx\n", hr);
+        return ALC_FALSE;
+    }
+
+    device->szDeviceName = strdup(deviceName);
+    return ALC_TRUE;
+}
+
+static void MMDevApiClosePlayback(ALCdevice *device)
+{
+    MMDevApiData *data = device->ExtraData;
+    ThreadRequest req = { data->MsgEvent, 0 };
+
+    if(PostThreadMessage(ThreadID, WM_USER_CloseDevice, (WPARAM)&req, (LPARAM)device))
+        (void)WaitForResponse(&req);
+
+    CloseHandle(data->MsgEvent);
+    data->MsgEvent = NULL;
+
+    CloseHandle(data->hNotifyEvent);
+    data->hNotifyEvent = NULL;
+
+    free(data);
+    device->ExtraData = NULL;
+}
+
+static ALCboolean MMDevApiResetPlayback(ALCdevice *device)
+{
+    MMDevApiData *data = device->ExtraData;
+    ThreadRequest req = { data->MsgEvent, 0 };
+    HRESULT hr = E_FAIL;
+
+    if(PostThreadMessage(ThreadID, WM_USER_ResetDevice, (WPARAM)&req, (LPARAM)device))
+        hr = WaitForResponse(&req);
+
+    return SUCCEEDED(hr) ? ALC_TRUE : ALC_FALSE;
+}
+
+static void MMDevApiStopPlayback(ALCdevice *device)
+{
+    MMDevApiData *data = device->ExtraData;
+    ThreadRequest req = { data->MsgEvent, 0 };
+
+    if(PostThreadMessage(ThreadID, WM_USER_StopDevice, (WPARAM)&req, (LPARAM)device))
+        (void)WaitForResponse(&req);
+}
+
+
+static const BackendFuncs MMDevApiFuncs = {
+    MMDevApiOpenPlayback,
+    MMDevApiClosePlayback,
+    MMDevApiResetPlayback,
+    MMDevApiStopPlayback,
+    NULL,
+    NULL,
+    NULL,
+    NULL,
+    NULL,
+    NULL
+};
+
+
+ALCboolean alcMMDevApiInit(BackendFuncs *FuncList)
+{
+    if(!MMDevApiLoad())
+        return ALC_FALSE;
+    *FuncList = MMDevApiFuncs;
+    return ALC_TRUE;
+}
+
+void alcMMDevApiDeinit(void)
+{
+    if(ThreadHdl)
+    {
+        TRACE("Sending WM_QUIT to Thread %04lx\n", ThreadID);
+        PostThreadMessage(ThreadID, WM_QUIT, 0, 0);
+        CloseHandle(ThreadHdl);
+        ThreadHdl = NULL;
+    }
+}
+
+void alcMMDevApiProbe(enum DevProbe type)
+{
+    switch(type)
+    {
+        case DEVICE_PROBE:
+            AppendDeviceList(mmDevice);
+            break;
+        case ALL_DEVICE_PROBE:
+            AppendAllDeviceList(mmDevice);
+            break;
+        case CAPTURE_DEVICE_PROBE:
+            break;
+    }
+}