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