alc/backends/wasapi.cpp

   1 /**
   2  * OpenAL cross platform audio library
   3  * Copyright (C) 2011 by authors.
   4  * This library is free software; you can redistribute it and/or
   5  *  modify it under the terms of the GNU Library General Public
   6  *  License as published by the Free Software Foundation; either
   7  *  version 2 of the License, or (at your option) any later version.
   8  *
   9  * This library is distributed in the hope that it will be useful,
  10  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  *  Library General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU Library General Public
  15  *  License along with this library; if not, write to the
  16  *  Free Software Foundation, Inc.,
  17  *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  18  * Or go to http://www.gnu.org/copyleft/lgpl.html
  19  */
  20
  21 #include "config.h"
  22
  23 #include "backends/wasapi.h"
  24
  25 #define WIN32_LEAN_AND_MEAN
  26 #include <windows.h>
  27
  28 #include <stdlib.h>
  29 #include <stdio.h>
  30 #include <memory.h>
  31
  32 #include <wtypes.h>
  33 #include <mmdeviceapi.h>
  34 #include <audioclient.h>
  35 #include <cguid.h>
  36 #include <devpropdef.h>
  37 #include <mmreg.h>
  38 #include <propsys.h>
  39 #include <propkey.h>
  40 #include <devpkey.h>
  41 #ifndef _WAVEFORMATEXTENSIBLE_
  42 #include <ks.h>
  43 #include <ksmedia.h>
  44 #endif
  45
  46 #include <algorithm>
  47 #include <atomic>
  48 #include <chrono>
  49 #include <condition_variable>
  50 #include <deque>
  51 #include <functional>
  52 #include <future>
  53 #include <mutex>
  54 #include <string>
  55 #include <thread>
  56 #include <vector>
  57
  58 #include "alcmain.h"
  59 #include "alexcpt.h"
  60 #include "alu.h"
  61 #include "compat.h"
  62 #include "converter.h"
  63 #include "logging.h"
  64 #include "ringbuffer.h"
  65 #include "strutils.h"
  66 #include "threads.h"
  67
  68
  69 /* Some headers seem to define these as macros for __uuidof, which is annoying
  70  * since some headers don't declare them at all. Hopefully the ifdef is enough
  71  * to tell if they need to be declared.
  72  */
  73 #ifndef KSDATAFORMAT_SUBTYPE_PCM
  74 DEFINE_GUID(KSDATAFORMAT_SUBTYPE_PCM, 0x00000001, 0x0000, 0x0010, 0x80, 0x00, 0x00, 0xaa, 0x00, 0x38, 0x9b, 0x71);
  75 #endif
  76 #ifndef KSDATAFORMAT_SUBTYPE_IEEE_FLOAT
  77 DEFINE_GUID(KSDATAFORMAT_SUBTYPE_IEEE_FLOAT, 0x00000003, 0x0000, 0x0010, 0x80, 0x00, 0x00, 0xaa, 0x00, 0x38, 0x9b, 0x71);
  78 #endif
  79
  80 DEFINE_DEVPROPKEY(DEVPKEY_Device_FriendlyName, 0xa45c254e, 0xdf1c, 0x4efd, 0x80,0x20, 0x67,0xd1,0x46,0xa8,0x50,0xe0, 14);
  81 DEFINE_PROPERTYKEY(PKEY_AudioEndpoint_FormFactor, 0x1da5d803, 0xd492, 0x4edd, 0x8c,0x23, 0xe0,0xc0,0xff,0xee,0x7f,0x0e, 0);
  82 DEFINE_PROPERTYKEY(PKEY_AudioEndpoint_GUID, 0x1da5d803, 0xd492, 0x4edd, 0x8c, 0x23,0xe0, 0xc0,0xff,0xee,0x7f,0x0e, 4 );
  83
  84
  85 namespace {
  86
  87 using std::chrono::milliseconds;
  88 using std::chrono::seconds;
  89
  90 using ReferenceTime = std::chrono::duration<REFERENCE_TIME,std::ratio<1,10000000>>;
  91
  92 inline constexpr ReferenceTime operator "" _reftime(unsigned long long int n) noexcept
  93 { return ReferenceTime{static_cast<REFERENCE_TIME>(n)}; }
  94
  95
  96 #define MONO SPEAKER_FRONT_CENTER
  97 #define STEREO (SPEAKER_FRONT_LEFT|SPEAKER_FRONT_RIGHT)
  98 #define QUAD (SPEAKER_FRONT_LEFT|SPEAKER_FRONT_RIGHT|SPEAKER_BACK_LEFT|SPEAKER_BACK_RIGHT)
  99 #define X5DOT1 (SPEAKER_FRONT_LEFT|SPEAKER_FRONT_RIGHT|SPEAKER_FRONT_CENTER|SPEAKER_LOW_FREQUENCY|SPEAKER_SIDE_LEFT|SPEAKER_SIDE_RIGHT)
 100 #define X5DOT1REAR (SPEAKER_FRONT_LEFT|SPEAKER_FRONT_RIGHT|SPEAKER_FRONT_CENTER|SPEAKER_LOW_FREQUENCY|SPEAKER_BACK_LEFT|SPEAKER_BACK_RIGHT)
 101 #define X6DOT1 (SPEAKER_FRONT_LEFT|SPEAKER_FRONT_RIGHT|SPEAKER_FRONT_CENTER|SPEAKER_LOW_FREQUENCY|SPEAKER_BACK_CENTER|SPEAKER_SIDE_LEFT|SPEAKER_SIDE_RIGHT)
 102 #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)
 103
 104 constexpr inline DWORD MaskFromTopBits(DWORD b) noexcept
 105 {
 106     b |= b>>1;
 107     b |= b>>2;
 108     b |= b>>4;
 109     b |= b>>8;
 110     b |= b>>16;
 111     return b;
 112 }
 113 constexpr DWORD MonoMask{MaskFromTopBits(MONO)};
 114 constexpr DWORD StereoMask{MaskFromTopBits(STEREO)};
 115 constexpr DWORD QuadMask{MaskFromTopBits(QUAD)};
 116 constexpr DWORD X51Mask{MaskFromTopBits(X5DOT1)};
 117 constexpr DWORD X51RearMask{MaskFromTopBits(X5DOT1REAR)};
 118 constexpr DWORD X61Mask{MaskFromTopBits(X6DOT1)};
 119 constexpr DWORD X71Mask{MaskFromTopBits(X7DOT1)};
 120
 121 #define DEVNAME_HEAD "OpenAL Soft on "
 122
 123
 124 /* Scales the given reftime value, rounding the result. */
 125 inline ALuint RefTime2Samples(const ReferenceTime &val, ALuint srate)
 126 {
 127     const auto retval = (val*srate + ReferenceTime{seconds{1}}/2) / seconds{1};
 128     return static_cast<ALuint>(mini64(retval, std::numeric_limits<ALuint>::max()));
 129 }
 130
 131
 132 template<typename T>
 133 class ComPtr {
 134     T *mPtr{nullptr};
 135
 136 public:
 137     ComPtr() noexcept = default;
 138     ComPtr(const ComPtr &rhs) : mPtr{rhs.mPtr} { if(mPtr) mPtr->AddRef(); }
 139     ComPtr(ComPtr&& rhs) noexcept : mPtr{rhs.mPtr} { rhs.mPtr = nullptr; }
 140     ComPtr(std::nullptr_t) noexcept { }
 141     explicit ComPtr(T *ptr) noexcept : mPtr{ptr} { }
 142     ~ComPtr() { if(mPtr) mPtr->Release(); }
 143
 144     ComPtr& operator=(const ComPtr &rhs)
 145     {
 146         if(!rhs.mPtr)
 147         {
 148             if(mPtr)
 149                 mPtr->Release();
 150             mPtr = nullptr;
 151         }
 152         else
 153         {
 154             rhs.mPtr->AddRef();
 155             try {
 156                 if(mPtr)
 157                     mPtr->Release();
 158                 mPtr = rhs.mPtr;
 159             }
 160             catch(...) {
 161                 rhs.mPtr->Release();
 162                 throw;
 163             }
 164         }
 165         return *this;
 166     }
 167     ComPtr& operator=(ComPtr&& rhs)
 168     {
 169         if(mPtr)
 170             mPtr->Release();
 171         mPtr = rhs.mPtr;
 172         rhs.mPtr = nullptr;
 173         return *this;
 174     }
 175
 176     operator bool() const noexcept { return mPtr != nullptr; }
 177
 178     T& operator*() const noexcept { return *mPtr; }
 179     T* operator->() const noexcept { return mPtr; }
 180     T* get() const noexcept { return mPtr; }
 181     T** getPtr() noexcept { return &mPtr; }
 182
 183     T* release() noexcept
 184     {
 185         T *ret{mPtr};
 186         mPtr = nullptr;
 187         return ret;
 188     }
 189
 190     void swap(ComPtr &rhs) noexcept { std::swap(mPtr, rhs.mPtr); }
 191     void swap(ComPtr&& rhs) noexcept { std::swap(mPtr, rhs.mPtr); }
 192 };
 193
 194
 195 class GuidPrinter {
 196     char mMsg[64];
 197
 198 public:
 199     GuidPrinter(const GUID &guid)
 200     {
 201         std::snprintf(mMsg, al::size(mMsg), "{%08lx-%04x-%04x-%02x%02x-%02x%02x%02x%02x%02x%02x}",
 202             DWORD{guid.Data1}, guid.Data2, guid.Data3, guid.Data4[0], guid.Data4[1], guid.Data4[2],
 203             guid.Data4[3], guid.Data4[4], guid.Data4[5], guid.Data4[6], guid.Data4[7]);
 204     }
 205     const char *c_str() const { return mMsg; }
 206 };
 207
 208 struct PropVariant {
 209     PROPVARIANT mProp;
 210
 211 public:
 212     PropVariant() { PropVariantInit(&mProp); }
 213     ~PropVariant() { clear(); }
 214
 215     void clear() { PropVariantClear(&mProp); }
 216
 217     PROPVARIANT* get() noexcept { return &mProp; }
 218
 219     PROPVARIANT& operator*() noexcept { return mProp; }
 220     const PROPVARIANT& operator*() const noexcept { return mProp; }
 221
 222     PROPVARIANT* operator->() noexcept { return &mProp; }
 223     const PROPVARIANT* operator->() const noexcept { return &mProp; }
 224 };
 225
 226 struct DevMap {
 227     std::string name;
 228     std::string endpoint_guid; // obtained from PKEY_AudioEndpoint_GUID , set to "Unknown device GUID" if absent.
 229     std::wstring devid;
 230
 231     template<typename T0, typename T1, typename T2>
 232     DevMap(T0&& name_, T1&& guid_, T2&& devid_)
 233       : name{std::forward<T0>(name_)}
 234       , endpoint_guid{std::forward<T1>(guid_)}
 235       , devid{std::forward<T2>(devid_)}
 236     { }
 237 };
 238
 239 bool checkName(const al::vector<DevMap> &list, const std::string &name)
 240 {
 241     return std::find_if(list.cbegin(), list.cend(),
 242         [&name](const DevMap &entry) -> bool
 243         { return entry.name == name; }
 244     ) != list.cend();
 245 }
 246
 247 al::vector<DevMap> PlaybackDevices;
 248 al::vector<DevMap> CaptureDevices;
 249
 250
 251 using NameGUIDPair = std::pair<std::string,std::string>;
 252 NameGUIDPair get_device_name_and_guid(IMMDevice *device)
 253 {
 254     static constexpr char UnknownName[]{"Unknown Device Name"};
 255     static constexpr char UnknownGuid[]{"Unknown Device GUID"};
 256     std::string name{DEVNAME_HEAD};
 257     std::string guid;
 258
 259     ComPtr<IPropertyStore> ps;
 260     HRESULT hr = device->OpenPropertyStore(STGM_READ, ps.getPtr());
 261     if(FAILED(hr))
 262     {
 263         WARN("OpenPropertyStore failed: 0x%08lx\n", hr);
 264         return std::make_pair(UnknownName, UnknownGuid);
 265     }
 266
 267     PropVariant pvprop;
 268     hr = ps->GetValue(reinterpret_cast<const PROPERTYKEY&>(DEVPKEY_Device_FriendlyName), pvprop.get());
 269     if(FAILED(hr))
 270     {
 271         WARN("GetValue Device_FriendlyName failed: 0x%08lx\n", hr);
 272         name += UnknownName;
 273     }
 274     else if(pvprop->vt == VT_LPWSTR)
 275         name += wstr_to_utf8(pvprop->pwszVal);
 276     else
 277     {
 278         WARN("Unexpected PROPVARIANT type: 0x%04x\n", pvprop->vt);
 279         name += UnknownName;
 280     }
 281
 282     pvprop.clear();
 283     hr = ps->GetValue(reinterpret_cast<const PROPERTYKEY&>(PKEY_AudioEndpoint_GUID), pvprop.get());
 284     if(FAILED(hr))
 285     {
 286         WARN("GetValue AudioEndpoint_GUID failed: 0x%08lx\n", hr);
 287         guid = UnknownGuid;
 288     }
 289     else if(pvprop->vt == VT_LPWSTR)
 290         guid = wstr_to_utf8(pvprop->pwszVal);
 291     else
 292     {
 293         WARN("Unexpected PROPVARIANT type: 0x%04x\n", pvprop->vt);
 294         guid = UnknownGuid;
 295     }
 296
 297     return std::make_pair(std::move(name), std::move(guid));
 298 }
 299
 300 void get_device_formfactor(IMMDevice *device, EndpointFormFactor *formfactor)
 301 {
 302     ComPtr<IPropertyStore> ps;
 303     HRESULT hr = device->OpenPropertyStore(STGM_READ, ps.getPtr());
 304     if(FAILED(hr))
 305     {
 306         WARN("OpenPropertyStore failed: 0x%08lx\n", hr);
 307         return;
 308     }
 309
 310     PropVariant pvform;
 311     hr = ps->GetValue(reinterpret_cast<const PROPERTYKEY&>(PKEY_AudioEndpoint_FormFactor), pvform.get());
 312     if(FAILED(hr))
 313         WARN("GetValue AudioEndpoint_FormFactor failed: 0x%08lx\n", hr);
 314     else if(pvform->vt == VT_UI4)
 315         *formfactor = static_cast<EndpointFormFactor>(pvform->ulVal);
 316     else if(pvform->vt == VT_EMPTY)
 317         *formfactor = UnknownFormFactor;
 318     else
 319         WARN("Unexpected PROPVARIANT type: 0x%04x\n", pvform->vt);
 320 }
 321
 322
 323 void add_device(IMMDevice *device, const WCHAR *devid, al::vector<DevMap> &list)
 324 {
 325     for(auto &entry : list)
 326     {
 327         if(entry.devid == devid)
 328             return;
 329     }
 330
 331     auto name_guid = get_device_name_and_guid(device);
 332
 333     int count{1};
 334     std::string newname{name_guid.first};
 335     while(checkName(list, newname))
 336     {
 337         newname = name_guid.first;
 338         newname += " #";
 339         newname += std::to_string(++count);
 340     }
 341     list.emplace_back(std::move(newname), std::move(name_guid.second), devid);
 342     const DevMap &newentry = list.back();
 343
 344     TRACE("Got device \"%s\", \"%s\", \"%ls\"\n", newentry.name.c_str(),
 345           newentry.endpoint_guid.c_str(), newentry.devid.c_str());
 346 }
 347
 348 WCHAR *get_device_id(IMMDevice *device)
 349 {
 350     WCHAR *devid;
 351
 352     const HRESULT hr{device->GetId(&devid)};
 353     if(FAILED(hr))
 354     {
 355         ERR("Failed to get device id: %lx\n", hr);
 356         return nullptr;
 357     }
 358
 359     return devid;
 360 }
 361
 362 void probe_devices(IMMDeviceEnumerator *devenum, EDataFlow flowdir, al::vector<DevMap> &list)
 363 {
 364     al::vector<DevMap>{}.swap(list);
 365
 366     ComPtr<IMMDeviceCollection> coll;
 367     HRESULT hr{devenum->EnumAudioEndpoints(flowdir, DEVICE_STATE_ACTIVE, coll.getPtr())};
 368     if(FAILED(hr))
 369     {
 370         ERR("Failed to enumerate audio endpoints: 0x%08lx\n", hr);
 371         return;
 372     }
 373
 374     UINT count{0};
 375     hr = coll->GetCount(&count);
 376     if(SUCCEEDED(hr) && count > 0)
 377         list.reserve(count);
 378
 379     ComPtr<IMMDevice> device;
 380     hr = devenum->GetDefaultAudioEndpoint(flowdir, eMultimedia, device.getPtr());
 381     if(SUCCEEDED(hr))
 382     {
 383         if(WCHAR *devid{get_device_id(device.get())})
 384         {
 385             add_device(device.get(), devid, list);
 386             CoTaskMemFree(devid);
 387         }
 388         device = nullptr;
 389     }
 390
 391     for(UINT i{0};i < count;++i)
 392     {
 393         hr = coll->Item(i, device.getPtr());
 394         if(FAILED(hr)) continue;
 395
 396         if(WCHAR *devid{get_device_id(device.get())})
 397         {
 398             add_device(device.get(), devid, list);
 399             CoTaskMemFree(devid);
 400         }
 401         device = nullptr;
 402     }
 403 }
 404
 405
 406 bool MakeExtensible(WAVEFORMATEXTENSIBLE *out, const WAVEFORMATEX *in)
 407 {
 408     *out = WAVEFORMATEXTENSIBLE{};
 409     if(in->wFormatTag == WAVE_FORMAT_EXTENSIBLE)
 410     {
 411         *out = *CONTAINING_RECORD(in, const WAVEFORMATEXTENSIBLE, Format);
 412         out->Format.cbSize = sizeof(*out) - sizeof(out->Format);
 413     }
 414     else if(in->wFormatTag == WAVE_FORMAT_PCM)
 415     {
 416         out->Format = *in;
 417         out->Format.cbSize = 0;
 418         out->Samples.wValidBitsPerSample = out->Format.wBitsPerSample;
 419         if(out->Format.nChannels == 1)
 420             out->dwChannelMask = MONO;
 421         else if(out->Format.nChannels == 2)
 422             out->dwChannelMask = STEREO;
 423         else
 424             ERR("Unhandled PCM channel count: %d\n", out->Format.nChannels);
 425         out->SubFormat = KSDATAFORMAT_SUBTYPE_PCM;
 426     }
 427     else if(in->wFormatTag == WAVE_FORMAT_IEEE_FLOAT)
 428     {
 429         out->Format = *in;
 430         out->Format.cbSize = 0;
 431         out->Samples.wValidBitsPerSample = out->Format.wBitsPerSample;
 432         if(out->Format.nChannels == 1)
 433             out->dwChannelMask = MONO;
 434         else if(out->Format.nChannels == 2)
 435             out->dwChannelMask = STEREO;
 436         else
 437             ERR("Unhandled IEEE float channel count: %d\n", out->Format.nChannels);
 438         out->SubFormat = KSDATAFORMAT_SUBTYPE_IEEE_FLOAT;
 439     }
 440     else
 441     {
 442         ERR("Unhandled format tag: 0x%04x\n", in->wFormatTag);
 443         return false;
 444     }
 445     return true;
 446 }
 447
 448 void TraceFormat(const char *msg, const WAVEFORMATEX *format)
 449 {
 450     constexpr size_t fmtex_extra_size{sizeof(WAVEFORMATEXTENSIBLE)-sizeof(WAVEFORMATEX)};
 451     if(format->wFormatTag == WAVE_FORMAT_EXTENSIBLE && format->cbSize >= fmtex_extra_size)
 452     {
 453         const WAVEFORMATEXTENSIBLE *fmtex{
 454             CONTAINING_RECORD(format, const WAVEFORMATEXTENSIBLE, Format)};
 455         TRACE("%s:\n"
 456             "    FormatTag      = 0x%04x\n"
 457             "    Channels       = %d\n"
 458             "    SamplesPerSec  = %lu\n"
 459             "    AvgBytesPerSec = %lu\n"
 460             "    BlockAlign     = %d\n"
 461             "    BitsPerSample  = %d\n"
 462             "    Size           = %d\n"
 463             "    Samples        = %d\n"
 464             "    ChannelMask    = 0x%lx\n"
 465             "    SubFormat      = %s\n",
 466             msg, fmtex->Format.wFormatTag, fmtex->Format.nChannels, fmtex->Format.nSamplesPerSec,
 467             fmtex->Format.nAvgBytesPerSec, fmtex->Format.nBlockAlign, fmtex->Format.wBitsPerSample,
 468             fmtex->Format.cbSize, fmtex->Samples.wReserved, fmtex->dwChannelMask,
 469             GuidPrinter{fmtex->SubFormat}.c_str());
 470     }
 471     else
 472         TRACE("%s:\n"
 473             "    FormatTag      = 0x%04x\n"
 474             "    Channels       = %d\n"
 475             "    SamplesPerSec  = %lu\n"
 476             "    AvgBytesPerSec = %lu\n"
 477             "    BlockAlign     = %d\n"
 478             "    BitsPerSample  = %d\n"
 479             "    Size           = %d\n",
 480             msg, format->wFormatTag, format->nChannels, format->nSamplesPerSec,
 481             format->nAvgBytesPerSec, format->nBlockAlign, format->wBitsPerSample, format->cbSize);
 482 }
 483
 484
 485 enum class MsgType {
 486     OpenDevice,
 487     ResetDevice,
 488     StartDevice,
 489     StopDevice,
 490     CloseDevice,
 491     EnumeratePlayback,
 492     EnumerateCapture,
 493     QuitThread,
 494
 495     Count
 496 };
 497
 498 constexpr char MessageStr[static_cast<size_t>(MsgType::Count)][20]{
 499     "Open Device",
 500     "Reset Device",
 501     "Start Device",
 502     "Stop Device",
 503     "Close Device",
 504     "Enumerate Playback",
 505     "Enumerate Capture",
 506     "Quit"
 507 };
 508
 509
 510 /* Proxy interface used by the message handler. */
 511 struct WasapiProxy {
 512     virtual ~WasapiProxy() = default;
 513
 514     virtual HRESULT openProxy() = 0;
 515     virtual void closeProxy() = 0;
 516
 517     virtual HRESULT resetProxy() = 0;
 518     virtual HRESULT startProxy() = 0;
 519     virtual void  stopProxy() = 0;
 520
 521     struct Msg {
 522         MsgType mType;
 523         WasapiProxy *mProxy;
 524         std::promise<HRESULT> mPromise;
 525     };
 526     static std::deque<Msg> mMsgQueue;
 527     static std::mutex mMsgQueueLock;
 528     static std::condition_variable mMsgQueueCond;
 529
 530     std::future<HRESULT> pushMessage(MsgType type)
 531     {
 532         std::promise<HRESULT> promise;
 533         std::future<HRESULT> future{promise.get_future()};
 534         {
 535             std::lock_guard<std::mutex> _{mMsgQueueLock};
 536             mMsgQueue.emplace_back(Msg{type, this, std::move(promise)});
 537         }
 538         mMsgQueueCond.notify_one();
 539         return future;
 540     }
 541
 542     static std::future<HRESULT> pushMessageStatic(MsgType type)
 543     {
 544         std::promise<HRESULT> promise;
 545         std::future<HRESULT> future{promise.get_future()};
 546         {
 547             std::lock_guard<std::mutex> _{mMsgQueueLock};
 548             mMsgQueue.emplace_back(Msg{type, nullptr, std::move(promise)});
 549         }
 550         mMsgQueueCond.notify_one();
 551         return future;
 552     }
 553
 554     static bool popMessage(Msg &msg)
 555     {
 556         std::unique_lock<std::mutex> lock{mMsgQueueLock};
 557         mMsgQueueCond.wait(lock, []{return !mMsgQueue.empty();});
 558         msg = std::move(mMsgQueue.front());
 559         mMsgQueue.pop_front();
 560         return msg.mType != MsgType::QuitThread;
 561     }
 562
 563     static int messageHandler(std::promise<HRESULT> *promise);
 564 };
 565 std::deque<WasapiProxy::Msg> WasapiProxy::mMsgQueue;
 566 std::mutex WasapiProxy::mMsgQueueLock;
 567 std::condition_variable WasapiProxy::mMsgQueueCond;
 568
 569 int WasapiProxy::messageHandler(std::promise<HRESULT> *promise)
 570 {
 571     TRACE("Starting message thread\n");
 572
 573     HRESULT cohr{CoInitializeEx(nullptr, COINIT_MULTITHREADED)};
 574     if(FAILED(cohr))
 575     {
 576         WARN("Failed to initialize COM: 0x%08lx\n", cohr);
 577         promise->set_value(cohr);
 578         return 0;
 579     }
 580
 581     void *ptr{};
 582     HRESULT hr{CoCreateInstance(CLSID_MMDeviceEnumerator, nullptr, CLSCTX_INPROC_SERVER,
 583         IID_IMMDeviceEnumerator, &ptr)};
 584     if(FAILED(hr))
 585     {
 586         WARN("Failed to create IMMDeviceEnumerator instance: 0x%08lx\n", hr);
 587         promise->set_value(hr);
 588         CoUninitialize();
 589         return 0;
 590     }
 591     static_cast<IMMDeviceEnumerator*>(ptr)->Release();
 592     CoUninitialize();
 593
 594     TRACE("Message thread initialization complete\n");
 595     promise->set_value(S_OK);
 596     promise = nullptr;
 597
 598     TRACE("Starting message loop\n");
 599     ALuint deviceCount{0};
 600     Msg msg;
 601     while(popMessage(msg))
 602     {
 603         TRACE("Got message \"%s\" (0x%04x, this=%p)\n",
 604             MessageStr[static_cast<size_t>(msg.mType)], static_cast<int>(msg.mType),
 605             decltype(std::declval<void*>()){msg.mProxy});
 606
 607         switch(msg.mType)
 608         {
 609         case MsgType::OpenDevice:
 610             hr = cohr = S_OK;
 611             if(++deviceCount == 1)
 612                 hr = cohr = CoInitializeEx(nullptr, COINIT_MULTITHREADED);
 613             if(SUCCEEDED(hr))
 614                 hr = msg.mProxy->openProxy();
 615             msg.mPromise.set_value(hr);
 616
 617             if(FAILED(hr))
 618             {
 619                 if(--deviceCount == 0 && SUCCEEDED(cohr))
 620                     CoUninitialize();
 621             }
 622             continue;
 623
 624         case MsgType::ResetDevice:
 625             hr = msg.mProxy->resetProxy();
 626             msg.mPromise.set_value(hr);
 627             continue;
 628
 629         case MsgType::StartDevice:
 630             hr = msg.mProxy->startProxy();
 631             msg.mPromise.set_value(hr);
 632             continue;
 633
 634         case MsgType::StopDevice:
 635             msg.mProxy->stopProxy();
 636             msg.mPromise.set_value(S_OK);
 637             continue;
 638
 639         case MsgType::CloseDevice:
 640             msg.mProxy->closeProxy();
 641             msg.mPromise.set_value(S_OK);
 642
 643             if(--deviceCount == 0)
 644                 CoUninitialize();
 645             continue;
 646
 647         case MsgType::EnumeratePlayback:
 648         case MsgType::EnumerateCapture:
 649             hr = cohr = S_OK;
 650             if(++deviceCount == 1)
 651                 hr = cohr = CoInitializeEx(nullptr, COINIT_MULTITHREADED);
 652             if(SUCCEEDED(hr))
 653                 hr = CoCreateInstance(CLSID_MMDeviceEnumerator, nullptr, CLSCTX_INPROC_SERVER,
 654                     IID_IMMDeviceEnumerator, &ptr);
 655             if(FAILED(hr))
 656                 msg.mPromise.set_value(hr);
 657             else
 658             {
 659                 ComPtr<IMMDeviceEnumerator> enumerator{static_cast<IMMDeviceEnumerator*>(ptr)};
 660
 661                 if(msg.mType == MsgType::EnumeratePlayback)
 662                     probe_devices(enumerator.get(), eRender, PlaybackDevices);
 663                 else if(msg.mType == MsgType::EnumerateCapture)
 664                     probe_devices(enumerator.get(), eCapture, CaptureDevices);
 665                 msg.mPromise.set_value(S_OK);
 666             }
 667
 668             if(--deviceCount == 0 && SUCCEEDED(cohr))
 669                 CoUninitialize();
 670             continue;
 671
 672         default:
 673             ERR("Unexpected message: %u\n", static_cast<unsigned int>(msg.mType));
 674             msg.mPromise.set_value(E_FAIL);
 675             continue;
 676         }
 677     }
 678     TRACE("Message loop finished\n");
 679
 680     return 0;
 681 }
 682
 683
 684 struct WasapiPlayback final : public BackendBase, WasapiProxy {
 685     WasapiPlayback(ALCdevice *device) noexcept : BackendBase{device} { }
 686     ~WasapiPlayback() override;
 687
 688     int mixerProc();
 689
 690     void open(const ALCchar *name) override;
 691     HRESULT openProxy() override;
 692     void closeProxy() override;
 693
 694     bool reset() override;
 695     HRESULT resetProxy() override;
 696     void start() override;
 697     HRESULT startProxy() override;
 698     void stop() override;
 699     void stopProxy() override;
 700
 701     ClockLatency getClockLatency() override;
 702
 703     std::wstring mDevId;
 704
 705     HRESULT mOpenStatus{E_FAIL};
 706     ComPtr<IMMDevice> mMMDev{nullptr};
 707     ComPtr<IAudioClient> mClient{nullptr};
 708     ComPtr<IAudioRenderClient> mRender{nullptr};
 709     HANDLE mNotifyEvent{nullptr};
 710
 711     UINT32 mFrameStep{0u};
 712     std::atomic<UINT32> mPadding{0u};
 713
 714     std::mutex mMutex;
 715
 716     std::atomic<bool> mKillNow{true};
 717     std::thread mThread;
 718
 719     DEF_NEWDEL(WasapiPlayback)
 720 };
 721
 722 WasapiPlayback::~WasapiPlayback()
 723 {
 724     if(SUCCEEDED(mOpenStatus))
 725         pushMessage(MsgType::CloseDevice).wait();
 726     mOpenStatus = E_FAIL;
 727
 728     if(mNotifyEvent != nullptr)
 729         CloseHandle(mNotifyEvent);
 730     mNotifyEvent = nullptr;
 731 }
 732
 733
 734 FORCE_ALIGN int WasapiPlayback::mixerProc()
 735 {
 736     HRESULT hr{CoInitializeEx(nullptr, COINIT_MULTITHREADED)};
 737     if(FAILED(hr))
 738     {
 739         ERR("CoInitializeEx(nullptr, COINIT_MULTITHREADED) failed: 0x%08lx\n", hr);
 740         mDevice->handleDisconnect("COM init failed: 0x%08lx", hr);
 741         return 1;
 742     }
 743
 744     SetRTPriority();
 745     althrd_setname(MIXER_THREAD_NAME);
 746
 747     const ALuint update_size{mDevice->UpdateSize};
 748     const UINT32 buffer_len{mDevice->BufferSize};
 749     while(!mKillNow.load(std::memory_order_relaxed))
 750     {
 751         UINT32 written;
 752         hr = mClient->GetCurrentPadding(&written);
 753         if(FAILED(hr))
 754         {
 755             ERR("Failed to get padding: 0x%08lx\n", hr);
 756             mDevice->handleDisconnect("Failed to retrieve buffer padding: 0x%08lx", hr);
 757             break;
 758         }
 759         mPadding.store(written, std::memory_order_relaxed);
 760
 761         ALuint len{buffer_len - written};
 762         if(len < update_size)
 763         {
 764             DWORD res{WaitForSingleObjectEx(mNotifyEvent, 2000, FALSE)};
 765             if(res != WAIT_OBJECT_0)
 766                 ERR("WaitForSingleObjectEx error: 0x%lx\n", res);
 767             continue;
 768         }
 769
 770         BYTE *buffer;
 771         hr = mRender->GetBuffer(len, &buffer);
 772         if(SUCCEEDED(hr))
 773         {
 774             {
 775                 std::lock_guard<std::mutex> _{mMutex};
 776                 mDevice->renderSamples(buffer, len, mFrameStep);
 777                 mPadding.store(written + len, std::memory_order_relaxed);
 778             }
 779             hr = mRender->ReleaseBuffer(len, 0);
 780         }
 781         if(FAILED(hr))
 782         {
 783             ERR("Failed to buffer data: 0x%08lx\n", hr);
 784             mDevice->handleDisconnect("Failed to send playback samples: 0x%08lx", hr);
 785             break;
 786         }
 787     }
 788     mPadding.store(0u, std::memory_order_release);
 789
 790     CoUninitialize();
 791     return 0;
 792 }
 793
 794
 795 void WasapiPlayback::open(const ALCchar *name)
 796 {
 797     HRESULT hr{S_OK};
 798
 799     mNotifyEvent = CreateEventW(nullptr, FALSE, FALSE, nullptr);
 800     if(mNotifyEvent == nullptr)
 801     {
 802         ERR("Failed to create notify events: %lu\n", GetLastError());
 803         hr = E_FAIL;
 804     }
 805
 806     if(SUCCEEDED(hr))
 807     {
 808         if(name)
 809         {
 810             if(PlaybackDevices.empty())
 811                 pushMessage(MsgType::EnumeratePlayback).wait();
 812
 813             hr = E_FAIL;
 814             auto iter = std::find_if(PlaybackDevices.cbegin(), PlaybackDevices.cend(),
 815                 [name](const DevMap &entry) -> bool
 816                 { return entry.name == name || entry.endpoint_guid == name; });
 817             if(iter == PlaybackDevices.cend())
 818             {
 819                 const std::wstring wname{utf8_to_wstr(name)};
 820                 iter = std::find_if(PlaybackDevices.cbegin(), PlaybackDevices.cend(),
 821                     [&wname](const DevMap &entry) -> bool
 822                     { return entry.devid == wname; });
 823             }
 824             if(iter == PlaybackDevices.cend())
 825                 WARN("Failed to find device name matching \"%s\"\n", name);
 826             else
 827             {
 828                 mDevId = iter->devid;
 829                 mDevice->DeviceName = iter->name;
 830                 hr = S_OK;
 831             }
 832         }
 833     }
 834
 835     if(SUCCEEDED(hr))
 836         hr = pushMessage(MsgType::OpenDevice).get();
 837     mOpenStatus = hr;
 838
 839     if(FAILED(hr))
 840     {
 841         if(mNotifyEvent != nullptr)
 842             CloseHandle(mNotifyEvent);
 843         mNotifyEvent = nullptr;
 844
 845         mDevId.clear();
 846
 847         throw al::backend_exception{ALC_INVALID_VALUE, "Device init failed: 0x%08lx", hr};
 848     }
 849 }
 850
 851 HRESULT WasapiPlayback::openProxy()
 852 {
 853     void *ptr;
 854     HRESULT hr{CoCreateInstance(CLSID_MMDeviceEnumerator, nullptr, CLSCTX_INPROC_SERVER,
 855         IID_IMMDeviceEnumerator, &ptr)};
 856     if(SUCCEEDED(hr))
 857     {
 858         ComPtr<IMMDeviceEnumerator> enumerator{static_cast<IMMDeviceEnumerator*>(ptr)};
 859         if(mDevId.empty())
 860             hr = enumerator->GetDefaultAudioEndpoint(eRender, eMultimedia, mMMDev.getPtr());
 861         else
 862             hr = enumerator->GetDevice(mDevId.c_str(), mMMDev.getPtr());
 863     }
 864     if(SUCCEEDED(hr))
 865         hr = mMMDev->Activate(IID_IAudioClient, CLSCTX_INPROC_SERVER, nullptr, &ptr);
 866     if(SUCCEEDED(hr))
 867     {
 868         mClient = ComPtr<IAudioClient>{static_cast<IAudioClient*>(ptr)};
 869         if(mDevice->DeviceName.empty())
 870             mDevice->DeviceName = get_device_name_and_guid(mMMDev.get()).first;
 871     }
 872
 873     if(FAILED(hr))
 874         mMMDev = nullptr;
 875
 876     return hr;
 877 }
 878
 879 void WasapiPlayback::closeProxy()
 880 {
 881     mClient = nullptr;
 882     mMMDev = nullptr;
 883 }
 884
 885
 886 bool WasapiPlayback::reset()
 887 {
 888     HRESULT hr{pushMessage(MsgType::ResetDevice).get()};
 889     if(FAILED(hr))
 890         throw al::backend_exception{ALC_INVALID_VALUE, "0x%08lx", hr};
 891     return true;
 892 }
 893
 894 HRESULT WasapiPlayback::resetProxy()
 895 {
 896     mClient = nullptr;
 897
 898     void *ptr;
 899     HRESULT hr{mMMDev->Activate(IID_IAudioClient, CLSCTX_INPROC_SERVER, nullptr, &ptr)};
 900     if(FAILED(hr))
 901     {
 902         ERR("Failed to reactivate audio client: 0x%08lx\n", hr);
 903         return hr;
 904     }
 905     mClient = ComPtr<IAudioClient>{static_cast<IAudioClient*>(ptr)};
 906
 907     WAVEFORMATEX *wfx;
 908     hr = mClient->GetMixFormat(&wfx);
 909     if(FAILED(hr))
 910     {
 911         ERR("Failed to get mix format: 0x%08lx\n", hr);
 912         return hr;
 913     }
 914
 915     WAVEFORMATEXTENSIBLE OutputType;
 916     if(!MakeExtensible(&OutputType, wfx))
 917     {
 918         CoTaskMemFree(wfx);
 919         return E_FAIL;
 920     }
 921     CoTaskMemFree(wfx);
 922     wfx = nullptr;
 923
 924     const ReferenceTime per_time{ReferenceTime{seconds{mDevice->UpdateSize}} / mDevice->Frequency};
 925     const ReferenceTime buf_time{ReferenceTime{seconds{mDevice->BufferSize}} / mDevice->Frequency};
 926
 927     if(!mDevice->Flags.get<FrequencyRequest>())
 928         mDevice->Frequency = OutputType.Format.nSamplesPerSec;
 929     if(!mDevice->Flags.get<ChannelsRequest>())
 930     {
 931         const uint32_t chancount{OutputType.Format.nChannels};
 932         const DWORD chanmask{OutputType.dwChannelMask};
 933         if(chancount >= 8 && (chanmask&X71Mask) == X7DOT1)
 934             mDevice->FmtChans = DevFmtX71;
 935         else if(chancount >= 7 && (chanmask&X61Mask) == X6DOT1)
 936             mDevice->FmtChans = DevFmtX61;
 937         else if(chancount >= 6 && (chanmask&X51Mask) == X5DOT1)
 938             mDevice->FmtChans = DevFmtX51;
 939         else if(chancount >= 6 && (chanmask&X51RearMask) == X5DOT1REAR)
 940             mDevice->FmtChans = DevFmtX51Rear;
 941         else if(chancount >= 4 && (chanmask&QuadMask) == QUAD)
 942             mDevice->FmtChans = DevFmtQuad;
 943         else if(chancount >= 2 && (chanmask&StereoMask) == STEREO)
 944             mDevice->FmtChans = DevFmtStereo;
 945         else if(chancount >= 1 && (chanmask&MonoMask) == MONO)
 946             mDevice->FmtChans = DevFmtMono;
 947         else
 948             ERR("Unhandled channel config: %d -- 0x%08lx\n", chancount, chanmask);
 949     }
 950
 951     OutputType.Format.wFormatTag = WAVE_FORMAT_EXTENSIBLE;
 952     switch(mDevice->FmtChans)
 953     {
 954     case DevFmtMono:
 955         OutputType.Format.nChannels = 1;
 956         OutputType.dwChannelMask = MONO;
 957         break;
 958     case DevFmtAmbi3D:
 959         mDevice->FmtChans = DevFmtStereo;
 960         /*fall-through*/
 961     case DevFmtStereo:
 962         OutputType.Format.nChannels = 2;
 963         OutputType.dwChannelMask = STEREO;
 964         break;
 965     case DevFmtQuad:
 966         OutputType.Format.nChannels = 4;
 967         OutputType.dwChannelMask = QUAD;
 968         break;
 969     case DevFmtX51:
 970         OutputType.Format.nChannels = 6;
 971         OutputType.dwChannelMask = X5DOT1;
 972         break;
 973     case DevFmtX51Rear:
 974         OutputType.Format.nChannels = 6;
 975         OutputType.dwChannelMask = X5DOT1REAR;
 976         break;
 977     case DevFmtX61:
 978         OutputType.Format.nChannels = 7;
 979         OutputType.dwChannelMask = X6DOT1;
 980         break;
 981     case DevFmtX71:
 982         OutputType.Format.nChannels = 8;
 983         OutputType.dwChannelMask = X7DOT1;
 984         break;
 985     }
 986     switch(mDevice->FmtType)
 987     {
 988     case DevFmtByte:
 989         mDevice->FmtType = DevFmtUByte;
 990         /* fall-through */
 991     case DevFmtUByte:
 992         OutputType.Format.wBitsPerSample = 8;
 993         OutputType.Samples.wValidBitsPerSample = 8;
 994         OutputType.SubFormat = KSDATAFORMAT_SUBTYPE_PCM;
 995         break;
 996     case DevFmtUShort:
 997         mDevice->FmtType = DevFmtShort;
 998         /* fall-through */
 999     case DevFmtShort:
1000         OutputType.Format.wBitsPerSample = 16;
1001         OutputType.Samples.wValidBitsPerSample = 16;
1002         OutputType.SubFormat = KSDATAFORMAT_SUBTYPE_PCM;
1003         break;
1004     case DevFmtUInt:
1005         mDevice->FmtType = DevFmtInt;
1006         /* fall-through */
1007     case DevFmtInt:
1008         OutputType.Format.wBitsPerSample = 32;
1009         OutputType.Samples.wValidBitsPerSample = 32;
1010         OutputType.SubFormat = KSDATAFORMAT_SUBTYPE_PCM;
1011         break;
1012     case DevFmtFloat:
1013         OutputType.Format.wBitsPerSample = 32;
1014         OutputType.Samples.wValidBitsPerSample = 32;
1015         OutputType.SubFormat = KSDATAFORMAT_SUBTYPE_IEEE_FLOAT;
1016         break;
1017     }
1018     OutputType.Format.nSamplesPerSec = mDevice->Frequency;
1019
1020     OutputType.Format.nBlockAlign = static_cast<WORD>(OutputType.Format.nChannels *
1021         OutputType.Format.wBitsPerSample / 8);
1022     OutputType.Format.nAvgBytesPerSec = OutputType.Format.nSamplesPerSec *
1023         OutputType.Format.nBlockAlign;
1024
1025     TraceFormat("Requesting playback format", &OutputType.Format);
1026     hr = mClient->IsFormatSupported(AUDCLNT_SHAREMODE_SHARED, &OutputType.Format, &wfx);
1027     if(FAILED(hr))
1028     {
1029         ERR("Failed to check format support: 0x%08lx\n", hr);
1030         hr = mClient->GetMixFormat(&wfx);
1031     }
1032     if(FAILED(hr))
1033     {
1034         ERR("Failed to find a supported format: 0x%08lx\n", hr);
1035         return hr;
1036     }
1037
1038     if(wfx != nullptr)
1039     {
1040         TraceFormat("Got playback format", wfx);
1041         if(!MakeExtensible(&OutputType, wfx))
1042         {
1043             CoTaskMemFree(wfx);
1044             return E_FAIL;
1045         }
1046         CoTaskMemFree(wfx);
1047         wfx = nullptr;
1048
1049         mDevice->Frequency = OutputType.Format.nSamplesPerSec;
1050         const uint32_t chancount{OutputType.Format.nChannels};
1051         const DWORD chanmask{OutputType.dwChannelMask};
1052         if(chancount >= 8 && (chanmask&X71Mask) == X7DOT1)
1053             mDevice->FmtChans = DevFmtX71;
1054         else if(chancount >= 7 && (chanmask&X61Mask) == X6DOT1)
1055             mDevice->FmtChans = DevFmtX61;
1056         else if(chancount >= 6 && (chanmask&X51Mask) == X5DOT1)
1057             mDevice->FmtChans = DevFmtX51;
1058         else if(chancount >= 6 && (chanmask&X51RearMask) == X5DOT1REAR)
1059             mDevice->FmtChans = DevFmtX51Rear;
1060         else if(chancount >= 4 && (chanmask&QuadMask) == QUAD)
1061             mDevice->FmtChans = DevFmtQuad;
1062         else if(chancount >= 2 && (chanmask&StereoMask) == STEREO)
1063             mDevice->FmtChans = DevFmtStereo;
1064         else if(chancount >= 1 && (chanmask&MonoMask) == MONO)
1065             mDevice->FmtChans = DevFmtMono;
1066         else
1067         {
1068             ERR("Unhandled extensible channels: %d -- 0x%08lx\n", OutputType.Format.nChannels,
1069                 OutputType.dwChannelMask);
1070             mDevice->FmtChans = DevFmtStereo;
1071             OutputType.Format.nChannels = 2;
1072             OutputType.dwChannelMask = STEREO;
1073         }
1074
1075         if(IsEqualGUID(OutputType.SubFormat, KSDATAFORMAT_SUBTYPE_PCM))
1076         {
1077             if(OutputType.Format.wBitsPerSample == 8)
1078                 mDevice->FmtType = DevFmtUByte;
1079             else if(OutputType.Format.wBitsPerSample == 16)
1080                 mDevice->FmtType = DevFmtShort;
1081             else if(OutputType.Format.wBitsPerSample == 32)
1082                 mDevice->FmtType = DevFmtInt;
1083             else
1084             {
1085                 mDevice->FmtType = DevFmtShort;
1086                 OutputType.Format.wBitsPerSample = 16;
1087             }
1088         }
1089         else if(IsEqualGUID(OutputType.SubFormat, KSDATAFORMAT_SUBTYPE_IEEE_FLOAT))
1090         {
1091             mDevice->FmtType = DevFmtFloat;
1092             OutputType.Format.wBitsPerSample = 32;
1093         }
1094         else
1095         {
1096             ERR("Unhandled format sub-type: %s\n", GuidPrinter{OutputType.SubFormat}.c_str());
1097             mDevice->FmtType = DevFmtShort;
1098             if(OutputType.Format.wFormatTag != WAVE_FORMAT_EXTENSIBLE)
1099                 OutputType.Format.wFormatTag = WAVE_FORMAT_PCM;
1100             OutputType.Format.wBitsPerSample = 16;
1101             OutputType.SubFormat = KSDATAFORMAT_SUBTYPE_PCM;
1102         }
1103         OutputType.Samples.wValidBitsPerSample = OutputType.Format.wBitsPerSample;
1104     }
1105     mFrameStep = OutputType.Format.nChannels;
1106
1107     EndpointFormFactor formfactor{UnknownFormFactor};
1108     get_device_formfactor(mMMDev.get(), &formfactor);
1109     mDevice->IsHeadphones = (mDevice->FmtChans == DevFmtStereo
1110         && (formfactor == Headphones || formfactor == Headset));
1111
1112     setChannelOrderFromWFXMask(OutputType.dwChannelMask);
1113
1114     hr = mClient->Initialize(AUDCLNT_SHAREMODE_SHARED, AUDCLNT_STREAMFLAGS_EVENTCALLBACK,
1115         buf_time.count(), 0, &OutputType.Format, nullptr);
1116     if(FAILED(hr))
1117     {
1118         ERR("Failed to initialize audio client: 0x%08lx\n", hr);
1119         return hr;
1120     }
1121
1122     UINT32 buffer_len{};
1123     ReferenceTime min_per{};
1124     hr = mClient->GetDevicePeriod(&reinterpret_cast<REFERENCE_TIME&>(min_per), nullptr);
1125     if(SUCCEEDED(hr))
1126         hr = mClient->GetBufferSize(&buffer_len);
1127     if(FAILED(hr))
1128     {
1129         ERR("Failed to get audio buffer info: 0x%08lx\n", hr);
1130         return hr;
1131     }
1132
1133     /* Find the nearest multiple of the period size to the update size */
1134     if(min_per < per_time)
1135         min_per *= maxi64((per_time + min_per/2) / min_per, 1);
1136     mDevice->UpdateSize = minu(RefTime2Samples(min_per, mDevice->Frequency), buffer_len/2);
1137     mDevice->BufferSize = buffer_len;
1138
1139     hr = mClient->SetEventHandle(mNotifyEvent);
1140     if(FAILED(hr))
1141     {
1142         ERR("Failed to set event handle: 0x%08lx\n", hr);
1143         return hr;
1144     }
1145
1146     return hr;
1147 }
1148
1149
1150 void WasapiPlayback::start()
1151 {
1152     const HRESULT hr{pushMessage(MsgType::StartDevice).get()};
1153     if(FAILED(hr))
1154         throw al::backend_exception{ALC_INVALID_DEVICE, "Failed to start playback: 0x%lx", hr};
1155 }
1156
1157 HRESULT WasapiPlayback::startProxy()
1158 {
1159     ResetEvent(mNotifyEvent);
1160
1161     HRESULT hr{mClient->Start()};
1162     if(FAILED(hr))
1163     {
1164         ERR("Failed to start audio client: 0x%08lx\n", hr);
1165         return hr;
1166     }
1167
1168     void *ptr;
1169     hr = mClient->GetService(IID_IAudioRenderClient, &ptr);
1170     if(SUCCEEDED(hr))
1171     {
1172         mRender = ComPtr<IAudioRenderClient>{static_cast<IAudioRenderClient*>(ptr)};
1173         try {
1174             mKillNow.store(false, std::memory_order_release);
1175             mThread = std::thread{std::mem_fn(&WasapiPlayback::mixerProc), this};
1176         }
1177         catch(...) {
1178             mRender = nullptr;
1179             ERR("Failed to start thread\n");
1180             hr = E_FAIL;
1181         }
1182     }
1183
1184     if(FAILED(hr))
1185         mClient->Stop();
1186
1187     return hr;
1188 }
1189
1190
1191 void WasapiPlayback::stop()
1192 { pushMessage(MsgType::StopDevice).wait(); }
1193
1194 void WasapiPlayback::stopProxy()
1195 {
1196     if(!mRender || !mThread.joinable())
1197         return;
1198
1199     mKillNow.store(true, std::memory_order_release);
1200     mThread.join();
1201
1202     mRender = nullptr;
1203     mClient->Stop();
1204 }
1205
1206
1207 ClockLatency WasapiPlayback::getClockLatency()
1208 {
1209     ClockLatency ret;
1210
1211     std::lock_guard<std::mutex> _{mMutex};
1212     ret.ClockTime = GetDeviceClockTime(mDevice);
1213     ret.Latency  = std::chrono::seconds{mPadding.load(std::memory_order_relaxed)};
1214     ret.Latency /= mDevice->Frequency;
1215
1216     return ret;
1217 }
1218
1219
1220 struct WasapiCapture final : public BackendBase, WasapiProxy {
1221     WasapiCapture(ALCdevice *device) noexcept : BackendBase{device} { }
1222     ~WasapiCapture() override;
1223
1224     int recordProc();
1225
1226     void open(const ALCchar *name) override;
1227     HRESULT openProxy() override;
1228     void closeProxy() override;
1229
1230     HRESULT resetProxy() override;
1231     void start() override;
1232     HRESULT startProxy() override;
1233     void stop() override;
1234     void stopProxy() override;
1235
1236     ALCenum captureSamples(al::byte *buffer, ALCuint samples) override;
1237     ALCuint availableSamples() override;
1238
1239     std::wstring mDevId;
1240
1241     HRESULT mOpenStatus{E_FAIL};
1242     ComPtr<IMMDevice> mMMDev{nullptr};
1243     ComPtr<IAudioClient> mClient{nullptr};
1244     ComPtr<IAudioCaptureClient> mCapture{nullptr};
1245     HANDLE mNotifyEvent{nullptr};
1246
1247     ChannelConverter mChannelConv{};
1248     SampleConverterPtr mSampleConv;
1249     RingBufferPtr mRing;
1250
1251     std::atomic<bool> mKillNow{true};
1252     std::thread mThread;
1253
1254     DEF_NEWDEL(WasapiCapture)
1255 };
1256
1257 WasapiCapture::~WasapiCapture()
1258 {
1259     if(SUCCEEDED(mOpenStatus))
1260         pushMessage(MsgType::CloseDevice).wait();
1261     mOpenStatus = E_FAIL;
1262
1263     if(mNotifyEvent != nullptr)
1264         CloseHandle(mNotifyEvent);
1265     mNotifyEvent = nullptr;
1266 }
1267
1268
1269 FORCE_ALIGN int WasapiCapture::recordProc()
1270 {
1271     HRESULT hr{CoInitializeEx(nullptr, COINIT_MULTITHREADED)};
1272     if(FAILED(hr))
1273     {
1274         ERR("CoInitializeEx(nullptr, COINIT_MULTITHREADED) failed: 0x%08lx\n", hr);
1275         mDevice->handleDisconnect("COM init failed: 0x%08lx", hr);
1276         return 1;
1277     }
1278
1279     althrd_setname(RECORD_THREAD_NAME);
1280
1281     al::vector<float> samples;
1282     while(!mKillNow.load(std::memory_order_relaxed))
1283     {
1284         UINT32 avail;
1285         hr = mCapture->GetNextPacketSize(&avail);
1286         if(FAILED(hr))
1287             ERR("Failed to get next packet size: 0x%08lx\n", hr);
1288         else if(avail > 0)
1289         {
1290             UINT32 numsamples;
1291             DWORD flags;
1292             BYTE *rdata;
1293
1294             hr = mCapture->GetBuffer(&rdata, &numsamples, &flags, nullptr, nullptr);
1295             if(FAILED(hr))
1296                 ERR("Failed to get capture buffer: 0x%08lx\n", hr);
1297             else
1298             {
1299                 if(mChannelConv.is_active())
1300                 {
1301                     samples.resize(numsamples*2);
1302                     mChannelConv.convert(rdata, samples.data(), numsamples);
1303                     rdata = reinterpret_cast<BYTE*>(samples.data());
1304                 }
1305
1306                 auto data = mRing->getWriteVector();
1307
1308                 size_t dstframes;
1309                 if(mSampleConv)
1310                 {
1311                     const void *srcdata{rdata};
1312                     ALuint srcframes{numsamples};
1313
1314                     dstframes = mSampleConv->convert(&srcdata, &srcframes, data.first.buf,
1315                         static_cast<ALuint>(minz(data.first.len, INT_MAX)));
1316                     if(srcframes > 0 && dstframes == data.first.len && data.second.len > 0)
1317                     {
1318                         /* If some source samples remain, all of the first dest
1319                          * block was filled, and there's space in the second
1320                          * dest block, do another run for the second block.
1321                          */
1322                         dstframes += mSampleConv->convert(&srcdata, &srcframes, data.second.buf,
1323                             static_cast<ALuint>(minz(data.second.len, INT_MAX)));
1324                     }
1325                 }
1326                 else
1327                 {
1328                     const auto framesize = static_cast<ALuint>(mDevice->frameSizeFromFmt());
1329                     size_t len1{minz(data.first.len, numsamples)};
1330                     size_t len2{minz(data.second.len, numsamples-len1)};
1331
1332                     memcpy(data.first.buf, rdata, len1*framesize);
1333                     if(len2 > 0)
1334                         memcpy(data.second.buf, rdata+len1*framesize, len2*framesize);
1335                     dstframes = len1 + len2;
1336                 }
1337
1338                 mRing->writeAdvance(dstframes);
1339
1340                 hr = mCapture->ReleaseBuffer(numsamples);
1341                 if(FAILED(hr)) ERR("Failed to release capture buffer: 0x%08lx\n", hr);
1342             }
1343         }
1344
1345         if(FAILED(hr))
1346         {
1347             mDevice->handleDisconnect("Failed to capture samples: 0x%08lx", hr);
1348             break;
1349         }
1350
1351         DWORD res{WaitForSingleObjectEx(mNotifyEvent, 2000, FALSE)};
1352         if(res != WAIT_OBJECT_0)
1353             ERR("WaitForSingleObjectEx error: 0x%lx\n", res);
1354     }
1355
1356     CoUninitialize();
1357     return 0;
1358 }
1359
1360
1361 void WasapiCapture::open(const ALCchar *name)
1362 {
1363     HRESULT hr{S_OK};
1364
1365     mNotifyEvent = CreateEventW(nullptr, FALSE, FALSE, nullptr);
1366     if(mNotifyEvent == nullptr)
1367     {
1368         ERR("Failed to create notify event: %lu\n", GetLastError());
1369         hr = E_FAIL;
1370     }
1371
1372     if(SUCCEEDED(hr))
1373     {
1374         if(name)
1375         {
1376             if(CaptureDevices.empty())
1377                 pushMessage(MsgType::EnumerateCapture).wait();
1378
1379             hr = E_FAIL;
1380             auto iter = std::find_if(CaptureDevices.cbegin(), CaptureDevices.cend(),
1381                 [name](const DevMap &entry) -> bool
1382                 { return entry.name == name || entry.endpoint_guid == name; });
1383             if(iter == CaptureDevices.cend())
1384             {
1385                 const std::wstring wname{utf8_to_wstr(name)};
1386                 iter = std::find_if(CaptureDevices.cbegin(), CaptureDevices.cend(),
1387                     [&wname](const DevMap &entry) -> bool
1388                     { return entry.devid == wname; });
1389             }
1390             if(iter == CaptureDevices.cend())
1391                 WARN("Failed to find device name matching \"%s\"\n", name);
1392             else
1393             {
1394                 mDevId = iter->devid;
1395                 mDevice->DeviceName = iter->name;
1396                 hr = S_OK;
1397             }
1398         }
1399     }
1400
1401     if(SUCCEEDED(hr))
1402         hr = pushMessage(MsgType::OpenDevice).get();
1403     mOpenStatus = hr;
1404
1405     if(FAILED(hr))
1406     {
1407         if(mNotifyEvent != nullptr)
1408             CloseHandle(mNotifyEvent);
1409         mNotifyEvent = nullptr;
1410
1411         mDevId.clear();
1412
1413         throw al::backend_exception{ALC_INVALID_VALUE, "Device init failed: 0x%08lx", hr};
1414     }
1415
1416     hr = pushMessage(MsgType::ResetDevice).get();
1417     if(FAILED(hr))
1418     {
1419         if(hr == E_OUTOFMEMORY)
1420             throw al::backend_exception{ALC_OUT_OF_MEMORY, "Out of memory"};
1421         throw al::backend_exception{ALC_INVALID_VALUE, "Device reset failed"};
1422     }
1423 }
1424
1425 HRESULT WasapiCapture::openProxy()
1426 {
1427     void *ptr;
1428     HRESULT hr{CoCreateInstance(CLSID_MMDeviceEnumerator, nullptr, CLSCTX_INPROC_SERVER,
1429         IID_IMMDeviceEnumerator, &ptr)};
1430     if(SUCCEEDED(hr))
1431     {
1432         ComPtr<IMMDeviceEnumerator> enumerator{static_cast<IMMDeviceEnumerator*>(ptr)};
1433         if(mDevId.empty())
1434             hr = enumerator->GetDefaultAudioEndpoint(eCapture, eMultimedia, mMMDev.getPtr());
1435         else
1436             hr = enumerator->GetDevice(mDevId.c_str(), mMMDev.getPtr());
1437     }
1438     if(SUCCEEDED(hr))
1439         hr = mMMDev->Activate(IID_IAudioClient, CLSCTX_INPROC_SERVER, nullptr, &ptr);
1440     if(SUCCEEDED(hr))
1441     {
1442         mClient = ComPtr<IAudioClient>{static_cast<IAudioClient*>(ptr)};
1443         if(mDevice->DeviceName.empty())
1444             mDevice->DeviceName = get_device_name_and_guid(mMMDev.get()).first;
1445     }
1446
1447     if(FAILED(hr))
1448         mMMDev = nullptr;
1449
1450     return hr;
1451 }
1452
1453 void WasapiCapture::closeProxy()
1454 {
1455     mClient = nullptr;
1456     mMMDev = nullptr;
1457 }
1458
1459 HRESULT WasapiCapture::resetProxy()
1460 {
1461     mClient = nullptr;
1462
1463     void *ptr;
1464     HRESULT hr{mMMDev->Activate(IID_IAudioClient, CLSCTX_INPROC_SERVER, nullptr, &ptr)};
1465     if(FAILED(hr))
1466     {
1467         ERR("Failed to reactivate audio client: 0x%08lx\n", hr);
1468         return hr;
1469     }
1470     mClient = ComPtr<IAudioClient>{static_cast<IAudioClient*>(ptr)};
1471
1472     // Make sure buffer is at least 100ms in size
1473     ReferenceTime buf_time{ReferenceTime{seconds{mDevice->BufferSize}} / mDevice->Frequency};
1474     buf_time = std::max(buf_time, ReferenceTime{milliseconds{100}});
1475
1476     WAVEFORMATEXTENSIBLE OutputType{};
1477     OutputType.Format.wFormatTag = WAVE_FORMAT_EXTENSIBLE;
1478     switch(mDevice->FmtChans)
1479     {
1480     case DevFmtMono:
1481         OutputType.Format.nChannels = 1;
1482         OutputType.dwChannelMask = MONO;
1483         break;
1484     case DevFmtStereo:
1485         OutputType.Format.nChannels = 2;
1486         OutputType.dwChannelMask = STEREO;
1487         break;
1488     case DevFmtQuad:
1489         OutputType.Format.nChannels = 4;
1490         OutputType.dwChannelMask = QUAD;
1491         break;
1492     case DevFmtX51:
1493         OutputType.Format.nChannels = 6;
1494         OutputType.dwChannelMask = X5DOT1;
1495         break;
1496     case DevFmtX51Rear:
1497         OutputType.Format.nChannels = 6;
1498         OutputType.dwChannelMask = X5DOT1REAR;
1499         break;
1500     case DevFmtX61:
1501         OutputType.Format.nChannels = 7;
1502         OutputType.dwChannelMask = X6DOT1;
1503         break;
1504     case DevFmtX71:
1505         OutputType.Format.nChannels = 8;
1506         OutputType.dwChannelMask = X7DOT1;
1507         break;
1508
1509     case DevFmtAmbi3D:
1510         return E_FAIL;
1511     }
1512     switch(mDevice->FmtType)
1513     {
1514     /* NOTE: Signedness doesn't matter, the converter will handle it. */
1515     case DevFmtByte:
1516     case DevFmtUByte:
1517         OutputType.Format.wBitsPerSample = 8;
1518         OutputType.SubFormat = KSDATAFORMAT_SUBTYPE_PCM;
1519         break;
1520     case DevFmtShort:
1521     case DevFmtUShort:
1522         OutputType.Format.wBitsPerSample = 16;
1523         OutputType.SubFormat = KSDATAFORMAT_SUBTYPE_PCM;
1524         break;
1525     case DevFmtInt:
1526     case DevFmtUInt:
1527         OutputType.Format.wBitsPerSample = 32;
1528         OutputType.SubFormat = KSDATAFORMAT_SUBTYPE_PCM;
1529         break;
1530     case DevFmtFloat:
1531         OutputType.Format.wBitsPerSample = 32;
1532         OutputType.SubFormat = KSDATAFORMAT_SUBTYPE_IEEE_FLOAT;
1533         break;
1534     }
1535     OutputType.Samples.wValidBitsPerSample = OutputType.Format.wBitsPerSample;
1536     OutputType.Format.nSamplesPerSec = mDevice->Frequency;
1537
1538     OutputType.Format.nBlockAlign = static_cast<WORD>(OutputType.Format.nChannels *
1539         OutputType.Format.wBitsPerSample / 8);
1540     OutputType.Format.nAvgBytesPerSec = OutputType.Format.nSamplesPerSec *
1541         OutputType.Format.nBlockAlign;
1542     OutputType.Format.cbSize = sizeof(OutputType) - sizeof(OutputType.Format);
1543
1544     TraceFormat("Requesting capture format", &OutputType.Format);
1545     WAVEFORMATEX *wfx;
1546     hr = mClient->IsFormatSupported(AUDCLNT_SHAREMODE_SHARED, &OutputType.Format, &wfx);
1547     if(FAILED(hr))
1548     {
1549         ERR("Failed to check format support: 0x%08lx\n", hr);
1550         return hr;
1551     }
1552
1553     mSampleConv = nullptr;
1554     mChannelConv = {};
1555
1556     if(wfx != nullptr)
1557     {
1558         TraceFormat("Got capture format", wfx);
1559         if(!(wfx->nChannels == OutputType.Format.nChannels ||
1560              (wfx->nChannels == 1 && OutputType.Format.nChannels == 2) ||
1561              (wfx->nChannels == 2 && OutputType.Format.nChannels == 1)))
1562         {
1563             ERR("Failed to get matching format, wanted: %s %s %uhz, got: %d channel%s %d-bit %luhz\n",
1564                 DevFmtChannelsString(mDevice->FmtChans), DevFmtTypeString(mDevice->FmtType),
1565                 mDevice->Frequency, wfx->nChannels, (wfx->nChannels==1)?"":"s", wfx->wBitsPerSample,
1566                 wfx->nSamplesPerSec);
1567             CoTaskMemFree(wfx);
1568             return E_FAIL;
1569         }
1570
1571         if(!MakeExtensible(&OutputType, wfx))
1572         {
1573             CoTaskMemFree(wfx);
1574             return E_FAIL;
1575         }
1576         CoTaskMemFree(wfx);
1577         wfx = nullptr;
1578     }
1579
1580     DevFmtType srcType;
1581     if(IsEqualGUID(OutputType.SubFormat, KSDATAFORMAT_SUBTYPE_PCM))
1582     {
1583         if(OutputType.Format.wBitsPerSample == 8)
1584             srcType = DevFmtUByte;
1585         else if(OutputType.Format.wBitsPerSample == 16)
1586             srcType = DevFmtShort;
1587         else if(OutputType.Format.wBitsPerSample == 32)
1588             srcType = DevFmtInt;
1589         else
1590         {
1591             ERR("Unhandled integer bit depth: %d\n", OutputType.Format.wBitsPerSample);
1592             return E_FAIL;
1593         }
1594     }
1595     else if(IsEqualGUID(OutputType.SubFormat, KSDATAFORMAT_SUBTYPE_IEEE_FLOAT))
1596     {
1597         if(OutputType.Format.wBitsPerSample == 32)
1598             srcType = DevFmtFloat;
1599         else
1600         {
1601             ERR("Unhandled float bit depth: %d\n", OutputType.Format.wBitsPerSample);
1602             return E_FAIL;
1603         }
1604     }
1605     else
1606     {
1607         ERR("Unhandled format sub-type: %s\n", GuidPrinter{OutputType.SubFormat}.c_str());
1608         return E_FAIL;
1609     }
1610
1611     if(mDevice->FmtChans == DevFmtMono && OutputType.Format.nChannels == 2)
1612     {
1613         mChannelConv = ChannelConverter{srcType, DevFmtStereo, mDevice->FmtChans};
1614         TRACE("Created %s stereo-to-mono converter\n", DevFmtTypeString(srcType));
1615         /* The channel converter always outputs float, so change the input type
1616          * for the resampler/type-converter.
1617          */
1618         srcType = DevFmtFloat;
1619     }
1620     else if(mDevice->FmtChans == DevFmtStereo && OutputType.Format.nChannels == 1)
1621     {
1622         mChannelConv = ChannelConverter{srcType, DevFmtMono, mDevice->FmtChans};
1623         TRACE("Created %s mono-to-stereo converter\n", DevFmtTypeString(srcType));
1624         srcType = DevFmtFloat;
1625     }
1626
1627     if(mDevice->Frequency != OutputType.Format.nSamplesPerSec || mDevice->FmtType != srcType)
1628     {
1629         mSampleConv = CreateSampleConverter(srcType, mDevice->FmtType, mDevice->channelsFromFmt(),
1630             OutputType.Format.nSamplesPerSec, mDevice->Frequency, Resampler::FastBSinc24);
1631         if(!mSampleConv)
1632         {
1633             ERR("Failed to create converter for %s format, dst: %s %uhz, src: %s %luhz\n",
1634                 DevFmtChannelsString(mDevice->FmtChans), DevFmtTypeString(mDevice->FmtType),
1635                 mDevice->Frequency, DevFmtTypeString(srcType), OutputType.Format.nSamplesPerSec);
1636             return E_FAIL;
1637         }
1638         TRACE("Created converter for %s format, dst: %s %uhz, src: %s %luhz\n",
1639             DevFmtChannelsString(mDevice->FmtChans), DevFmtTypeString(mDevice->FmtType),
1640             mDevice->Frequency, DevFmtTypeString(srcType), OutputType.Format.nSamplesPerSec);
1641     }
1642
1643     hr = mClient->Initialize(AUDCLNT_SHAREMODE_SHARED, AUDCLNT_STREAMFLAGS_EVENTCALLBACK,
1644         buf_time.count(), 0, &OutputType.Format, nullptr);
1645     if(FAILED(hr))
1646     {
1647         ERR("Failed to initialize audio client: 0x%08lx\n", hr);
1648         return hr;
1649     }
1650
1651     UINT32 buffer_len{};
1652     ReferenceTime min_per{};
1653     hr = mClient->GetDevicePeriod(&reinterpret_cast<REFERENCE_TIME&>(min_per), nullptr);
1654     if(SUCCEEDED(hr))
1655         hr = mClient->GetBufferSize(&buffer_len);
1656     if(FAILED(hr))
1657     {
1658         ERR("Failed to get buffer size: 0x%08lx\n", hr);
1659         return hr;
1660     }
1661     mDevice->UpdateSize = RefTime2Samples(min_per, mDevice->Frequency);
1662     mDevice->BufferSize = buffer_len;
1663
1664     mRing = RingBuffer::Create(buffer_len, mDevice->frameSizeFromFmt(), false);
1665
1666     hr = mClient->SetEventHandle(mNotifyEvent);
1667     if(FAILED(hr))
1668     {
1669         ERR("Failed to set event handle: 0x%08lx\n", hr);
1670         return hr;
1671     }
1672
1673     return hr;
1674 }
1675
1676
1677 void WasapiCapture::start()
1678 {
1679     const HRESULT hr{pushMessage(MsgType::StartDevice).get()};
1680     if(FAILED(hr))
1681         throw al::backend_exception{ALC_INVALID_DEVICE, "Failed to start recording: 0x%lx", hr};
1682 }
1683
1684 HRESULT WasapiCapture::startProxy()
1685 {
1686     ResetEvent(mNotifyEvent);
1687
1688     HRESULT hr{mClient->Start()};
1689     if(FAILED(hr))
1690     {
1691         ERR("Failed to start audio client: 0x%08lx\n", hr);
1692         return hr;
1693     }
1694
1695     void *ptr;
1696     hr = mClient->GetService(IID_IAudioCaptureClient, &ptr);
1697     if(SUCCEEDED(hr))
1698     {
1699         mCapture = ComPtr<IAudioCaptureClient>{static_cast<IAudioCaptureClient*>(ptr)};
1700         try {
1701             mKillNow.store(false, std::memory_order_release);
1702             mThread = std::thread{std::mem_fn(&WasapiCapture::recordProc), this};
1703         }
1704         catch(...) {
1705             mCapture = nullptr;
1706             ERR("Failed to start thread\n");
1707             hr = E_FAIL;
1708         }
1709     }
1710
1711     if(FAILED(hr))
1712     {
1713         mClient->Stop();
1714         mClient->Reset();
1715     }
1716
1717     return hr;
1718 }
1719
1720
1721 void WasapiCapture::stop()
1722 { pushMessage(MsgType::StopDevice).wait(); }
1723
1724 void WasapiCapture::stopProxy()
1725 {
1726     if(!mCapture || !mThread.joinable())
1727         return;
1728
1729     mKillNow.store(true, std::memory_order_release);
1730     mThread.join();
1731
1732     mCapture = nullptr;
1733     mClient->Stop();
1734     mClient->Reset();
1735 }
1736
1737
1738 ALCuint WasapiCapture::availableSamples()
1739 { return static_cast<ALCuint>(mRing->readSpace()); }
1740
1741 ALCenum WasapiCapture::captureSamples(al::byte *buffer, ALCuint samples)
1742 {
1743     mRing->read(buffer, samples);
1744     return ALC_NO_ERROR;
1745 }
1746
1747 } // namespace
1748
1749
1750 bool WasapiBackendFactory::init()
1751 {
1752     static HRESULT InitResult{E_FAIL};
1753
1754     if(FAILED(InitResult)) try
1755     {
1756         std::promise<HRESULT> promise;
1757         auto future = promise.get_future();
1758
1759         std::thread{&WasapiProxy::messageHandler, &promise}.detach();
1760         InitResult = future.get();
1761     }
1762     catch(...) {
1763     }
1764
1765     return SUCCEEDED(InitResult) ? ALC_TRUE : ALC_FALSE;
1766 }
1767
1768 bool WasapiBackendFactory::querySupport(BackendType type)
1769 { return type == BackendType::Playback || type == BackendType::Capture; }
1770
1771 std::string WasapiBackendFactory::probe(BackendType type)
1772 {
1773     std::string outnames;
1774     auto add_device = [&outnames](const DevMap &entry) -> void
1775     {
1776         /* +1 to also append the null char (to ensure a null-separated list and
1777          * double-null terminated list).
1778          */
1779         outnames.append(entry.name.c_str(), entry.name.length()+1);
1780     };
1781
1782     switch(type)
1783     {
1784     case BackendType::Playback:
1785         WasapiProxy::pushMessageStatic(MsgType::EnumeratePlayback).wait();
1786         std::for_each(PlaybackDevices.cbegin(), PlaybackDevices.cend(), add_device);
1787         break;
1788
1789     case BackendType::Capture:
1790         WasapiProxy::pushMessageStatic(MsgType::EnumerateCapture).wait();
1791         std::for_each(CaptureDevices.cbegin(), CaptureDevices.cend(), add_device);
1792         break;
1793     }
1794
1795     return outnames;
1796 }
1797
1798 BackendPtr WasapiBackendFactory::createBackend(ALCdevice *device, BackendType type)
1799 {
1800     if(type == BackendType::Playback)
1801         return BackendPtr{new WasapiPlayback{device}};
1802     if(type == BackendType::Capture)
1803         return BackendPtr{new WasapiCapture{device}};
1804     return nullptr;
1805 }
1806
1807 BackendFactory &WasapiBackendFactory::getFactory()
1808 {
1809     static WasapiBackendFactory factory{};
1810     return factory;
1811 }