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 main(int,char **)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 "albit.h" 59 #include "alcmain.h" 60 #include "alu.h" 61 #include "compat.h" 62 #include "converter.h" 63 #include "core/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 uint RefTime2Samples(const ReferenceTime &val, uint srate) 126 { 127 const auto retval = (val*srate + ReferenceTime{seconds{1}}/2) / seconds{1}; 128 return static_cast<uint>(mini64(retval, std::numeric_limits<uint>::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 uint 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<uint>(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<uint>(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 char *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 uint 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 uint 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 char *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{al::backend_error::DeviceError, "Device init failed: 0x%08lx", 848 hr}; 849 } 850 } 851 852 HRESULT WasapiPlayback::openProxy() 853 { 854 void *ptr; 855 HRESULT hr{CoCreateInstance(CLSID_MMDeviceEnumerator, nullptr, CLSCTX_INPROC_SERVER, 856 IID_IMMDeviceEnumerator, &ptr)}; 857 if(SUCCEEDED(hr)) 858 { 859 ComPtr<IMMDeviceEnumerator> enumerator{static_cast<IMMDeviceEnumerator*>(ptr)}; 860 if(mDevId.empty()) 861 hr = enumerator->GetDefaultAudioEndpoint(eRender, eMultimedia, mMMDev.getPtr()); 862 else 863 hr = enumerator->GetDevice(mDevId.c_str(), mMMDev.getPtr()); 864 } 865 if(SUCCEEDED(hr)) 866 hr = mMMDev->Activate(IID_IAudioClient, CLSCTX_INPROC_SERVER, nullptr, &ptr); 867 if(SUCCEEDED(hr)) 868 { 869 mClient = ComPtr<IAudioClient>{static_cast<IAudioClient*>(ptr)}; 870 if(mDevice->DeviceName.empty()) 871 mDevice->DeviceName = get_device_name_and_guid(mMMDev.get()).first; 872 } 873 874 if(FAILED(hr)) 875 mMMDev = nullptr; 876 877 return hr; 878 } 879 880 void WasapiPlayback::closeProxy() 881 { 882 mClient = nullptr; 883 mMMDev = nullptr; 884 } 885 886 887 bool WasapiPlayback::reset() 888 { 889 HRESULT hr{pushMessage(MsgType::ResetDevice).get()}; 890 if(FAILED(hr)) 891 throw al::backend_exception{al::backend_error::DeviceError, "0x%08lx", hr}; 892 return true; 893 } 894 895 HRESULT WasapiPlayback::resetProxy() 896 { 897 mClient = nullptr; 898 899 void *ptr; 900 HRESULT hr{mMMDev->Activate(IID_IAudioClient, CLSCTX_INPROC_SERVER, nullptr, &ptr)}; 901 if(FAILED(hr)) 902 { 903 ERR("Failed to reactivate audio client: 0x%08lx\n", hr); 904 return hr; 905 } 906 mClient = ComPtr<IAudioClient>{static_cast<IAudioClient*>(ptr)}; 907 908 WAVEFORMATEX *wfx; 909 hr = mClient->GetMixFormat(&wfx); 910 if(FAILED(hr)) 911 { 912 ERR("Failed to get mix format: 0x%08lx\n", hr); 913 return hr; 914 } 915 916 WAVEFORMATEXTENSIBLE OutputType; 917 if(!MakeExtensible(&OutputType, wfx)) 918 { 919 CoTaskMemFree(wfx); 920 return E_FAIL; 921 } 922 CoTaskMemFree(wfx); 923 wfx = nullptr; 924 925 const ReferenceTime per_time{ReferenceTime{seconds{mDevice->UpdateSize}} / mDevice->Frequency}; 926 const ReferenceTime buf_time{ReferenceTime{seconds{mDevice->BufferSize}} / mDevice->Frequency}; 927 928 if(!mDevice->Flags.test(FrequencyRequest)) 929 mDevice->Frequency = OutputType.Format.nSamplesPerSec; 930 if(!mDevice->Flags.test(ChannelsRequest)) 931 { 932 const uint32_t chancount{OutputType.Format.nChannels}; 933 const DWORD chanmask{OutputType.dwChannelMask}; 934 if(chancount >= 8 && (chanmask&X71Mask) == X7DOT1) 935 mDevice->FmtChans = DevFmtX71; 936 else if(chancount >= 7 && (chanmask&X61Mask) == X6DOT1) 937 mDevice->FmtChans = DevFmtX61; 938 else if(chancount >= 6 && (chanmask&X51Mask) == X5DOT1) 939 mDevice->FmtChans = DevFmtX51; 940 else if(chancount >= 6 && (chanmask&X51RearMask) == X5DOT1REAR) 941 mDevice->FmtChans = DevFmtX51Rear; 942 else if(chancount >= 4 && (chanmask&QuadMask) == QUAD) 943 mDevice->FmtChans = DevFmtQuad; 944 else if(chancount >= 2 && (chanmask&StereoMask) == STEREO) 945 mDevice->FmtChans = DevFmtStereo; 946 else if(chancount >= 1 && (chanmask&MonoMask) == MONO) 947 mDevice->FmtChans = DevFmtMono; 948 else 949 ERR("Unhandled channel config: %d -- 0x%08lx\n", chancount, chanmask); 950 } 951 952 OutputType.Format.wFormatTag = WAVE_FORMAT_EXTENSIBLE; 953 switch(mDevice->FmtChans) 954 { 955 case DevFmtMono: 956 OutputType.Format.nChannels = 1; 957 OutputType.dwChannelMask = MONO; 958 break; 959 case DevFmtAmbi3D: 960 mDevice->FmtChans = DevFmtStereo; 961 /*fall-through*/ 962 case DevFmtStereo: 963 OutputType.Format.nChannels = 2; 964 OutputType.dwChannelMask = STEREO; 965 break; 966 case DevFmtQuad: 967 OutputType.Format.nChannels = 4; 968 OutputType.dwChannelMask = QUAD; 969 break; 970 case DevFmtX51: 971 OutputType.Format.nChannels = 6; 972 OutputType.dwChannelMask = X5DOT1; 973 break; 974 case DevFmtX51Rear: 975 OutputType.Format.nChannels = 6; 976 OutputType.dwChannelMask = X5DOT1REAR; 977 break; 978 case DevFmtX61: 979 OutputType.Format.nChannels = 7; 980 OutputType.dwChannelMask = X6DOT1; 981 break; 982 case DevFmtX71: 983 OutputType.Format.nChannels = 8; 984 OutputType.dwChannelMask = X7DOT1; 985 break; 986 } 987 switch(mDevice->FmtType) 988 { 989 case DevFmtByte: 990 mDevice->FmtType = DevFmtUByte; 991 /* fall-through */ 992 case DevFmtUByte: 993 OutputType.Format.wBitsPerSample = 8; 994 OutputType.Samples.wValidBitsPerSample = 8; 995 OutputType.SubFormat = KSDATAFORMAT_SUBTYPE_PCM; 996 break; 997 case DevFmtUShort: 998 mDevice->FmtType = DevFmtShort; 999 /* fall-through */ 1000 case DevFmtShort: 1001 OutputType.Format.wBitsPerSample = 16; 1002 OutputType.Samples.wValidBitsPerSample = 16; 1003 OutputType.SubFormat = KSDATAFORMAT_SUBTYPE_PCM; 1004 break; 1005 case DevFmtUInt: 1006 mDevice->FmtType = DevFmtInt; 1007 /* fall-through */ 1008 case DevFmtInt: 1009 OutputType.Format.wBitsPerSample = 32; 1010 OutputType.Samples.wValidBitsPerSample = 32; 1011 OutputType.SubFormat = KSDATAFORMAT_SUBTYPE_PCM; 1012 break; 1013 case DevFmtFloat: 1014 OutputType.Format.wBitsPerSample = 32; 1015 OutputType.Samples.wValidBitsPerSample = 32; 1016 OutputType.SubFormat = KSDATAFORMAT_SUBTYPE_IEEE_FLOAT; 1017 break; 1018 } 1019 OutputType.Format.nSamplesPerSec = mDevice->Frequency; 1020 1021 OutputType.Format.nBlockAlign = static_cast<WORD>(OutputType.Format.nChannels * 1022 OutputType.Format.wBitsPerSample / 8); 1023 OutputType.Format.nAvgBytesPerSec = OutputType.Format.nSamplesPerSec * 1024 OutputType.Format.nBlockAlign; 1025 1026 TraceFormat("Requesting playback format", &OutputType.Format); 1027 hr = mClient->IsFormatSupported(AUDCLNT_SHAREMODE_SHARED, &OutputType.Format, &wfx); 1028 if(FAILED(hr)) 1029 { 1030 ERR("Failed to check format support: 0x%08lx\n", hr); 1031 hr = mClient->GetMixFormat(&wfx); 1032 } 1033 if(FAILED(hr)) 1034 { 1035 ERR("Failed to find a supported format: 0x%08lx\n", hr); 1036 return hr; 1037 } 1038 1039 if(wfx != nullptr) 1040 { 1041 TraceFormat("Got playback format", wfx); 1042 if(!MakeExtensible(&OutputType, wfx)) 1043 { 1044 CoTaskMemFree(wfx); 1045 return E_FAIL; 1046 } 1047 CoTaskMemFree(wfx); 1048 wfx = nullptr; 1049 1050 mDevice->Frequency = OutputType.Format.nSamplesPerSec; 1051 const uint32_t chancount{OutputType.Format.nChannels}; 1052 const DWORD chanmask{OutputType.dwChannelMask}; 1053 if(chancount >= 8 && (chanmask&X71Mask) == X7DOT1) 1054 mDevice->FmtChans = DevFmtX71; 1055 else if(chancount >= 7 && (chanmask&X61Mask) == X6DOT1) 1056 mDevice->FmtChans = DevFmtX61; 1057 else if(chancount >= 6 && (chanmask&X51Mask) == X5DOT1) 1058 mDevice->FmtChans = DevFmtX51; 1059 else if(chancount >= 6 && (chanmask&X51RearMask) == X5DOT1REAR) 1060 mDevice->FmtChans = DevFmtX51Rear; 1061 else if(chancount >= 4 && (chanmask&QuadMask) == QUAD) 1062 mDevice->FmtChans = DevFmtQuad; 1063 else if(chancount >= 2 && (chanmask&StereoMask) == STEREO) 1064 mDevice->FmtChans = DevFmtStereo; 1065 else if(chancount >= 1 && (chanmask&MonoMask) == MONO) 1066 mDevice->FmtChans = DevFmtMono; 1067 else 1068 { 1069 ERR("Unhandled extensible channels: %d -- 0x%08lx\n", OutputType.Format.nChannels, 1070 OutputType.dwChannelMask); 1071 mDevice->FmtChans = DevFmtStereo; 1072 OutputType.Format.nChannels = 2; 1073 OutputType.dwChannelMask = STEREO; 1074 } 1075 1076 if(IsEqualGUID(OutputType.SubFormat, KSDATAFORMAT_SUBTYPE_PCM)) 1077 { 1078 if(OutputType.Format.wBitsPerSample == 8) 1079 mDevice->FmtType = DevFmtUByte; 1080 else if(OutputType.Format.wBitsPerSample == 16) 1081 mDevice->FmtType = DevFmtShort; 1082 else if(OutputType.Format.wBitsPerSample == 32) 1083 mDevice->FmtType = DevFmtInt; 1084 else 1085 { 1086 mDevice->FmtType = DevFmtShort; 1087 OutputType.Format.wBitsPerSample = 16; 1088 } 1089 } 1090 else if(IsEqualGUID(OutputType.SubFormat, KSDATAFORMAT_SUBTYPE_IEEE_FLOAT)) 1091 { 1092 mDevice->FmtType = DevFmtFloat; 1093 OutputType.Format.wBitsPerSample = 32; 1094 } 1095 else 1096 { 1097 ERR("Unhandled format sub-type: %s\n", GuidPrinter{OutputType.SubFormat}.c_str()); 1098 mDevice->FmtType = DevFmtShort; 1099 if(OutputType.Format.wFormatTag != WAVE_FORMAT_EXTENSIBLE) 1100 OutputType.Format.wFormatTag = WAVE_FORMAT_PCM; 1101 OutputType.Format.wBitsPerSample = 16; 1102 OutputType.SubFormat = KSDATAFORMAT_SUBTYPE_PCM; 1103 } 1104 OutputType.Samples.wValidBitsPerSample = OutputType.Format.wBitsPerSample; 1105 } 1106 mFrameStep = OutputType.Format.nChannels; 1107 1108 EndpointFormFactor formfactor{UnknownFormFactor}; 1109 get_device_formfactor(mMMDev.get(), &formfactor); 1110 mDevice->IsHeadphones = (mDevice->FmtChans == DevFmtStereo 1111 && (formfactor == Headphones || formfactor == Headset)); 1112 1113 setChannelOrderFromWFXMask(OutputType.dwChannelMask); 1114 1115 hr = mClient->Initialize(AUDCLNT_SHAREMODE_SHARED, AUDCLNT_STREAMFLAGS_EVENTCALLBACK, 1116 buf_time.count(), 0, &OutputType.Format, nullptr); 1117 if(FAILED(hr)) 1118 { 1119 ERR("Failed to initialize audio client: 0x%08lx\n", hr); 1120 return hr; 1121 } 1122 1123 UINT32 buffer_len{}; 1124 ReferenceTime min_per{}; 1125 hr = mClient->GetDevicePeriod(&reinterpret_cast<REFERENCE_TIME&>(min_per), nullptr); 1126 if(SUCCEEDED(hr)) 1127 hr = mClient->GetBufferSize(&buffer_len); 1128 if(FAILED(hr)) 1129 { 1130 ERR("Failed to get audio buffer info: 0x%08lx\n", hr); 1131 return hr; 1132 } 1133 1134 /* Find the nearest multiple of the period size to the update size */ 1135 if(min_per < per_time) 1136 min_per *= maxi64((per_time + min_per/2) / min_per, 1); 1137 mDevice->UpdateSize = minu(RefTime2Samples(min_per, mDevice->Frequency), buffer_len/2); 1138 mDevice->BufferSize = buffer_len; 1139 1140 hr = mClient->SetEventHandle(mNotifyEvent); 1141 if(FAILED(hr)) 1142 { 1143 ERR("Failed to set event handle: 0x%08lx\n", hr); 1144 return hr; 1145 } 1146 1147 return hr; 1148 } 1149 1150 1151 void WasapiPlayback::start() 1152 { 1153 const HRESULT hr{pushMessage(MsgType::StartDevice).get()}; 1154 if(FAILED(hr)) 1155 throw al::backend_exception{al::backend_error::DeviceError, 1156 "Failed to start playback: 0x%lx", hr}; 1157 } 1158 1159 HRESULT WasapiPlayback::startProxy() 1160 { 1161 ResetEvent(mNotifyEvent); 1162 1163 HRESULT hr{mClient->Start()}; 1164 if(FAILED(hr)) 1165 { 1166 ERR("Failed to start audio client: 0x%08lx\n", hr); 1167 return hr; 1168 } 1169 1170 void *ptr; 1171 hr = mClient->GetService(IID_IAudioRenderClient, &ptr); 1172 if(SUCCEEDED(hr)) 1173 { 1174 mRender = ComPtr<IAudioRenderClient>{static_cast<IAudioRenderClient*>(ptr)}; 1175 try { 1176 mKillNow.store(false, std::memory_order_release); 1177 mThread = std::thread{std::mem_fn(&WasapiPlayback::mixerProc), this}; 1178 } 1179 catch(...) { 1180 mRender = nullptr; 1181 ERR("Failed to start thread\n"); 1182 hr = E_FAIL; 1183 } 1184 } 1185 1186 if(FAILED(hr)) 1187 mClient->Stop(); 1188 1189 return hr; 1190 } 1191 1192 1193 void WasapiPlayback::stop() 1194 { pushMessage(MsgType::StopDevice).wait(); } 1195 1196 void WasapiPlayback::stopProxy() 1197 { 1198 if(!mRender || !mThread.joinable()) 1199 return; 1200 1201 mKillNow.store(true, std::memory_order_release); 1202 mThread.join(); 1203 1204 mRender = nullptr; 1205 mClient->Stop(); 1206 } 1207 1208 1209 ClockLatency WasapiPlayback::getClockLatency() 1210 { 1211 ClockLatency ret; 1212 1213 std::lock_guard<std::mutex> _{mMutex}; 1214 ret.ClockTime = GetDeviceClockTime(mDevice); 1215 ret.Latency = std::chrono::seconds{mPadding.load(std::memory_order_relaxed)}; 1216 ret.Latency /= mDevice->Frequency; 1217 1218 return ret; 1219 } 1220 1221 1222 struct WasapiCapture final : public BackendBase, WasapiProxy { 1223 WasapiCapture(ALCdevice *device) noexcept : BackendBase{device} { } 1224 ~WasapiCapture() override; 1225 1226 int recordProc(); 1227 1228 void open(const char *name) override; 1229 HRESULT openProxy() override; 1230 void closeProxy() override; 1231 1232 HRESULT resetProxy() override; 1233 void start() override; 1234 HRESULT startProxy() override; 1235 void stop() override; 1236 void stopProxy() override; 1237 1238 void captureSamples(al::byte *buffer, uint samples) override; 1239 uint availableSamples() override; 1240 1241 std::wstring mDevId; 1242 1243 HRESULT mOpenStatus{E_FAIL}; 1244 ComPtr<IMMDevice> mMMDev{nullptr}; 1245 ComPtr<IAudioClient> mClient{nullptr}; 1246 ComPtr<IAudioCaptureClient> mCapture{nullptr}; 1247 HANDLE mNotifyEvent{nullptr}; 1248 1249 ChannelConverter mChannelConv{}; 1250 SampleConverterPtr mSampleConv; 1251 RingBufferPtr mRing; 1252 1253 std::atomic<bool> mKillNow{true}; 1254 std::thread mThread; 1255 1256 DEF_NEWDEL(WasapiCapture) 1257 }; 1258 1259 WasapiCapture::~WasapiCapture() 1260 { 1261 if(SUCCEEDED(mOpenStatus)) 1262 pushMessage(MsgType::CloseDevice).wait(); 1263 mOpenStatus = E_FAIL; 1264 1265 if(mNotifyEvent != nullptr) 1266 CloseHandle(mNotifyEvent); 1267 mNotifyEvent = nullptr; 1268 } 1269 1270 1271 FORCE_ALIGN int WasapiCapture::recordProc() 1272 { 1273 HRESULT hr{CoInitializeEx(nullptr, COINIT_MULTITHREADED)}; 1274 if(FAILED(hr)) 1275 { 1276 ERR("CoInitializeEx(nullptr, COINIT_MULTITHREADED) failed: 0x%08lx\n", hr); 1277 mDevice->handleDisconnect("COM init failed: 0x%08lx", hr); 1278 return 1; 1279 } 1280 1281 althrd_setname(RECORD_THREAD_NAME); 1282 1283 al::vector<float> samples; 1284 while(!mKillNow.load(std::memory_order_relaxed)) 1285 { 1286 UINT32 avail; 1287 hr = mCapture->GetNextPacketSize(&avail); 1288 if(FAILED(hr)) 1289 ERR("Failed to get next packet size: 0x%08lx\n", hr); 1290 else if(avail > 0) 1291 { 1292 UINT32 numsamples; 1293 DWORD flags; 1294 BYTE *rdata; 1295 1296 hr = mCapture->GetBuffer(&rdata, &numsamples, &flags, nullptr, nullptr); 1297 if(FAILED(hr)) 1298 ERR("Failed to get capture buffer: 0x%08lx\n", hr); 1299 else 1300 { 1301 if(mChannelConv.is_active()) 1302 { 1303 samples.resize(numsamples*2); 1304 mChannelConv.convert(rdata, samples.data(), numsamples); 1305 rdata = reinterpret_cast<BYTE*>(samples.data()); 1306 } 1307 1308 auto data = mRing->getWriteVector(); 1309 1310 size_t dstframes; 1311 if(mSampleConv) 1312 { 1313 const void *srcdata{rdata}; 1314 uint srcframes{numsamples}; 1315 1316 dstframes = mSampleConv->convert(&srcdata, &srcframes, data.first.buf, 1317 static_cast<uint>(minz(data.first.len, INT_MAX))); 1318 if(srcframes > 0 && dstframes == data.first.len && data.second.len > 0) 1319 { 1320 /* If some source samples remain, all of the first dest 1321 * block was filled, and there's space in the second 1322 * dest block, do another run for the second block. 1323 */ 1324 dstframes += mSampleConv->convert(&srcdata, &srcframes, data.second.buf, 1325 static_cast<uint>(minz(data.second.len, INT_MAX))); 1326 } 1327 } 1328 else 1329 { 1330 const uint framesize{mDevice->frameSizeFromFmt()}; 1331 size_t len1{minz(data.first.len, numsamples)}; 1332 size_t len2{minz(data.second.len, numsamples-len1)}; 1333 1334 memcpy(data.first.buf, rdata, len1*framesize); 1335 if(len2 > 0) 1336 memcpy(data.second.buf, rdata+len1*framesize, len2*framesize); 1337 dstframes = len1 + len2; 1338 } 1339 1340 mRing->writeAdvance(dstframes); 1341 1342 hr = mCapture->ReleaseBuffer(numsamples); 1343 if(FAILED(hr)) ERR("Failed to release capture buffer: 0x%08lx\n", hr); 1344 } 1345 } 1346 1347 if(FAILED(hr)) 1348 { 1349 mDevice->handleDisconnect("Failed to capture samples: 0x%08lx", hr); 1350 break; 1351 } 1352 1353 DWORD res{WaitForSingleObjectEx(mNotifyEvent, 2000, FALSE)}; 1354 if(res != WAIT_OBJECT_0) 1355 ERR("WaitForSingleObjectEx error: 0x%lx\n", res); 1356 } 1357 1358 CoUninitialize(); 1359 return 0; 1360 } 1361 1362 1363 void WasapiCapture::open(const char *name) 1364 { 1365 HRESULT hr{S_OK}; 1366 1367 mNotifyEvent = CreateEventW(nullptr, FALSE, FALSE, nullptr); 1368 if(mNotifyEvent == nullptr) 1369 { 1370 ERR("Failed to create notify event: %lu\n", GetLastError()); 1371 hr = E_FAIL; 1372 } 1373 1374 if(SUCCEEDED(hr)) 1375 { 1376 if(name) 1377 { 1378 if(CaptureDevices.empty()) 1379 pushMessage(MsgType::EnumerateCapture).wait(); 1380 1381 hr = E_FAIL; 1382 auto iter = std::find_if(CaptureDevices.cbegin(), CaptureDevices.cend(), 1383 [name](const DevMap &entry) -> bool 1384 { return entry.name == name || entry.endpoint_guid == name; }); 1385 if(iter == CaptureDevices.cend()) 1386 { 1387 const std::wstring wname{utf8_to_wstr(name)}; 1388 iter = std::find_if(CaptureDevices.cbegin(), CaptureDevices.cend(), 1389 [&wname](const DevMap &entry) -> bool 1390 { return entry.devid == wname; }); 1391 } 1392 if(iter == CaptureDevices.cend()) 1393 WARN("Failed to find device name matching \"%s\"\n", name); 1394 else 1395 { 1396 mDevId = iter->devid; 1397 mDevice->DeviceName = iter->name; 1398 hr = S_OK; 1399 } 1400 } 1401 } 1402 1403 if(SUCCEEDED(hr)) 1404 hr = pushMessage(MsgType::OpenDevice).get(); 1405 mOpenStatus = hr; 1406 1407 if(FAILED(hr)) 1408 { 1409 if(mNotifyEvent != nullptr) 1410 CloseHandle(mNotifyEvent); 1411 mNotifyEvent = nullptr; 1412 1413 mDevId.clear(); 1414 1415 throw al::backend_exception{al::backend_error::DeviceError, "Device init failed: 0x%08lx", 1416 hr}; 1417 } 1418 1419 hr = pushMessage(MsgType::ResetDevice).get(); 1420 if(FAILED(hr)) 1421 { 1422 if(hr == E_OUTOFMEMORY) 1423 throw al::backend_exception{al::backend_error::OutOfMemory, "Out of memory"}; 1424 throw al::backend_exception{al::backend_error::DeviceError, "Device reset failed"}; 1425 } 1426 } 1427 1428 HRESULT WasapiCapture::openProxy() 1429 { 1430 void *ptr; 1431 HRESULT hr{CoCreateInstance(CLSID_MMDeviceEnumerator, nullptr, CLSCTX_INPROC_SERVER, 1432 IID_IMMDeviceEnumerator, &ptr)}; 1433 if(SUCCEEDED(hr)) 1434 { 1435 ComPtr<IMMDeviceEnumerator> enumerator{static_cast<IMMDeviceEnumerator*>(ptr)}; 1436 if(mDevId.empty()) 1437 hr = enumerator->GetDefaultAudioEndpoint(eCapture, eMultimedia, mMMDev.getPtr()); 1438 else 1439 hr = enumerator->GetDevice(mDevId.c_str(), mMMDev.getPtr()); 1440 } 1441 if(SUCCEEDED(hr)) 1442 hr = mMMDev->Activate(IID_IAudioClient, CLSCTX_INPROC_SERVER, nullptr, &ptr); 1443 if(SUCCEEDED(hr)) 1444 { 1445 mClient = ComPtr<IAudioClient>{static_cast<IAudioClient*>(ptr)}; 1446 if(mDevice->DeviceName.empty()) 1447 mDevice->DeviceName = get_device_name_and_guid(mMMDev.get()).first; 1448 } 1449 1450 if(FAILED(hr)) 1451 mMMDev = nullptr; 1452 1453 return hr; 1454 } 1455 1456 void WasapiCapture::closeProxy() 1457 { 1458 mClient = nullptr; 1459 mMMDev = nullptr; 1460 } 1461 1462 HRESULT WasapiCapture::resetProxy() 1463 { 1464 mClient = nullptr; 1465 1466 void *ptr; 1467 HRESULT hr{mMMDev->Activate(IID_IAudioClient, CLSCTX_INPROC_SERVER, nullptr, &ptr)}; 1468 if(FAILED(hr)) 1469 { 1470 ERR("Failed to reactivate audio client: 0x%08lx\n", hr); 1471 return hr; 1472 } 1473 mClient = ComPtr<IAudioClient>{static_cast<IAudioClient*>(ptr)}; 1474 1475 // Make sure buffer is at least 100ms in size 1476 ReferenceTime buf_time{ReferenceTime{seconds{mDevice->BufferSize}} / mDevice->Frequency}; 1477 buf_time = std::max(buf_time, ReferenceTime{milliseconds{100}}); 1478 1479 WAVEFORMATEXTENSIBLE InputType{}; 1480 InputType.Format.wFormatTag = WAVE_FORMAT_EXTENSIBLE; 1481 switch(mDevice->FmtChans) 1482 { 1483 case DevFmtMono: 1484 InputType.Format.nChannels = 1; 1485 InputType.dwChannelMask = MONO; 1486 break; 1487 case DevFmtStereo: 1488 InputType.Format.nChannels = 2; 1489 InputType.dwChannelMask = STEREO; 1490 break; 1491 case DevFmtQuad: 1492 InputType.Format.nChannels = 4; 1493 InputType.dwChannelMask = QUAD; 1494 break; 1495 case DevFmtX51: 1496 InputType.Format.nChannels = 6; 1497 InputType.dwChannelMask = X5DOT1; 1498 break; 1499 case DevFmtX51Rear: 1500 InputType.Format.nChannels = 6; 1501 InputType.dwChannelMask = X5DOT1REAR; 1502 break; 1503 case DevFmtX61: 1504 InputType.Format.nChannels = 7; 1505 InputType.dwChannelMask = X6DOT1; 1506 break; 1507 case DevFmtX71: 1508 InputType.Format.nChannels = 8; 1509 InputType.dwChannelMask = X7DOT1; 1510 break; 1511 1512 case DevFmtAmbi3D: 1513 return E_FAIL; 1514 } 1515 switch(mDevice->FmtType) 1516 { 1517 /* NOTE: Signedness doesn't matter, the converter will handle it. */ 1518 case DevFmtByte: 1519 case DevFmtUByte: 1520 InputType.Format.wBitsPerSample = 8; 1521 InputType.SubFormat = KSDATAFORMAT_SUBTYPE_PCM; 1522 break; 1523 case DevFmtShort: 1524 case DevFmtUShort: 1525 InputType.Format.wBitsPerSample = 16; 1526 InputType.SubFormat = KSDATAFORMAT_SUBTYPE_PCM; 1527 break; 1528 case DevFmtInt: 1529 case DevFmtUInt: 1530 InputType.Format.wBitsPerSample = 32; 1531 InputType.SubFormat = KSDATAFORMAT_SUBTYPE_PCM; 1532 break; 1533 case DevFmtFloat: 1534 InputType.Format.wBitsPerSample = 32; 1535 InputType.SubFormat = KSDATAFORMAT_SUBTYPE_IEEE_FLOAT; 1536 break; 1537 } 1538 InputType.Samples.wValidBitsPerSample = InputType.Format.wBitsPerSample; 1539 InputType.Format.nSamplesPerSec = mDevice->Frequency; 1540 1541 InputType.Format.nBlockAlign = static_cast<WORD>(InputType.Format.nChannels * 1542 InputType.Format.wBitsPerSample / 8); 1543 InputType.Format.nAvgBytesPerSec = InputType.Format.nSamplesPerSec * 1544 InputType.Format.nBlockAlign; 1545 InputType.Format.cbSize = sizeof(InputType) - sizeof(InputType.Format); 1546 1547 TraceFormat("Requesting capture format", &InputType.Format); 1548 WAVEFORMATEX *wfx; 1549 hr = mClient->IsFormatSupported(AUDCLNT_SHAREMODE_SHARED, &InputType.Format, &wfx); 1550 if(FAILED(hr)) 1551 { 1552 ERR("Failed to check format support: 0x%08lx\n", hr); 1553 return hr; 1554 } 1555 1556 mSampleConv = nullptr; 1557 mChannelConv = {}; 1558 1559 if(wfx != nullptr) 1560 { 1561 TraceFormat("Got capture format", wfx); 1562 if(!MakeExtensible(&InputType, wfx)) 1563 { 1564 CoTaskMemFree(wfx); 1565 return E_FAIL; 1566 } 1567 CoTaskMemFree(wfx); 1568 wfx = nullptr; 1569 1570 auto validate_fmt = [](ALCdevice *device, uint32_t chancount, DWORD chanmask) noexcept 1571 -> bool 1572 { 1573 switch(device->FmtChans) 1574 { 1575 /* If the device wants mono, we can handle any input. */ 1576 case DevFmtMono: 1577 return true; 1578 /* If the device wants stereo, we can handle mono or stereo input. */ 1579 case DevFmtStereo: 1580 return (chancount == 2 && (chanmask == 0 || (chanmask&StereoMask) == STEREO)) 1581 || (chancount == 1 && (chanmask&MonoMask) == MONO); 1582 /* Otherwise, the device must match the input type. */ 1583 case DevFmtQuad: 1584 return (chancount == 4 && (chanmask == 0 || (chanmask&QuadMask) == QUAD)); 1585 /* 5.1 (Side) and 5.1 (Rear) are interchangeable here. */ 1586 case DevFmtX51: 1587 case DevFmtX51Rear: 1588 return (chancount == 6 && (chanmask == 0 || (chanmask&X51Mask) == X5DOT1 1589 || (chanmask&X51RearMask) == X5DOT1REAR)); 1590 case DevFmtX61: 1591 return (chancount == 7 && (chanmask == 0 || (chanmask&X61Mask) == X6DOT1)); 1592 case DevFmtX71: 1593 return (chancount == 8 && (chanmask == 0 || (chanmask&X71Mask) == X7DOT1)); 1594 case DevFmtAmbi3D: return (chanmask == 0 && device->channelsFromFmt()); 1595 } 1596 return false; 1597 }; 1598 if(!validate_fmt(mDevice, InputType.Format.nChannels, InputType.dwChannelMask)) 1599 { 1600 ERR("Failed to match format, wanted: %s %s %uhz, got: 0x%08lx mask %d channel%s %d-bit %luhz\n", 1601 DevFmtChannelsString(mDevice->FmtChans), DevFmtTypeString(mDevice->FmtType), 1602 mDevice->Frequency, InputType.dwChannelMask, InputType.Format.nChannels, 1603 (InputType.Format.nChannels==1)?"":"s", InputType.Format.wBitsPerSample, 1604 InputType.Format.nSamplesPerSec); 1605 return E_FAIL; 1606 } 1607 } 1608 1609 DevFmtType srcType{}; 1610 if(IsEqualGUID(InputType.SubFormat, KSDATAFORMAT_SUBTYPE_PCM)) 1611 { 1612 if(InputType.Format.wBitsPerSample == 8) 1613 srcType = DevFmtUByte; 1614 else if(InputType.Format.wBitsPerSample == 16) 1615 srcType = DevFmtShort; 1616 else if(InputType.Format.wBitsPerSample == 32) 1617 srcType = DevFmtInt; 1618 else 1619 { 1620 ERR("Unhandled integer bit depth: %d\n", InputType.Format.wBitsPerSample); 1621 return E_FAIL; 1622 } 1623 } 1624 else if(IsEqualGUID(InputType.SubFormat, KSDATAFORMAT_SUBTYPE_IEEE_FLOAT)) 1625 { 1626 if(InputType.Format.wBitsPerSample == 32) 1627 srcType = DevFmtFloat; 1628 else 1629 { 1630 ERR("Unhandled float bit depth: %d\n", InputType.Format.wBitsPerSample); 1631 return E_FAIL; 1632 } 1633 } 1634 else 1635 { 1636 ERR("Unhandled format sub-type: %s\n", GuidPrinter{InputType.SubFormat}.c_str()); 1637 return E_FAIL; 1638 } 1639 1640 if(mDevice->FmtChans == DevFmtMono && InputType.Format.nChannels != 1) 1641 { 1642 uint chanmask{(1u<<InputType.Format.nChannels) - 1u}; 1643 /* Exclude LFE from the downmix. */ 1644 if((InputType.dwChannelMask&SPEAKER_LOW_FREQUENCY)) 1645 { 1646 constexpr auto lfemask = MaskFromTopBits(SPEAKER_LOW_FREQUENCY); 1647 const int lfeidx{al::popcount(InputType.dwChannelMask&lfemask) - 1}; 1648 chanmask &= ~(1u << lfeidx); 1649 } 1650 1651 mChannelConv = ChannelConverter{srcType, InputType.Format.nChannels, chanmask, 1652 mDevice->FmtChans}; 1653 TRACE("Created %s multichannel-to-mono converter\n", DevFmtTypeString(srcType)); 1654 /* The channel converter always outputs float, so change the input type 1655 * for the resampler/type-converter. 1656 */ 1657 srcType = DevFmtFloat; 1658 } 1659 else if(mDevice->FmtChans == DevFmtStereo && InputType.Format.nChannels == 1) 1660 { 1661 mChannelConv = ChannelConverter{srcType, 1, 0x1, mDevice->FmtChans}; 1662 TRACE("Created %s mono-to-stereo converter\n", DevFmtTypeString(srcType)); 1663 srcType = DevFmtFloat; 1664 } 1665 1666 if(mDevice->Frequency != InputType.Format.nSamplesPerSec || mDevice->FmtType != srcType) 1667 { 1668 mSampleConv = CreateSampleConverter(srcType, mDevice->FmtType, mDevice->channelsFromFmt(), 1669 InputType.Format.nSamplesPerSec, mDevice->Frequency, Resampler::FastBSinc24); 1670 if(!mSampleConv) 1671 { 1672 ERR("Failed to create converter for %s format, dst: %s %uhz, src: %s %luhz\n", 1673 DevFmtChannelsString(mDevice->FmtChans), DevFmtTypeString(mDevice->FmtType), 1674 mDevice->Frequency, DevFmtTypeString(srcType), InputType.Format.nSamplesPerSec); 1675 return E_FAIL; 1676 } 1677 TRACE("Created converter for %s format, dst: %s %uhz, src: %s %luhz\n", 1678 DevFmtChannelsString(mDevice->FmtChans), DevFmtTypeString(mDevice->FmtType), 1679 mDevice->Frequency, DevFmtTypeString(srcType), InputType.Format.nSamplesPerSec); 1680 } 1681 1682 hr = mClient->Initialize(AUDCLNT_SHAREMODE_SHARED, AUDCLNT_STREAMFLAGS_EVENTCALLBACK, 1683 buf_time.count(), 0, &InputType.Format, nullptr); 1684 if(FAILED(hr)) 1685 { 1686 ERR("Failed to initialize audio client: 0x%08lx\n", hr); 1687 return hr; 1688 } 1689 1690 UINT32 buffer_len{}; 1691 ReferenceTime min_per{}; 1692 hr = mClient->GetDevicePeriod(&reinterpret_cast<REFERENCE_TIME&>(min_per), nullptr); 1693 if(SUCCEEDED(hr)) 1694 hr = mClient->GetBufferSize(&buffer_len); 1695 if(FAILED(hr)) 1696 { 1697 ERR("Failed to get buffer size: 0x%08lx\n", hr); 1698 return hr; 1699 } 1700 mDevice->UpdateSize = RefTime2Samples(min_per, mDevice->Frequency); 1701 mDevice->BufferSize = buffer_len; 1702 1703 mRing = RingBuffer::Create(buffer_len, mDevice->frameSizeFromFmt(), false); 1704 1705 hr = mClient->SetEventHandle(mNotifyEvent); 1706 if(FAILED(hr)) 1707 { 1708 ERR("Failed to set event handle: 0x%08lx\n", hr); 1709 return hr; 1710 } 1711 1712 return hr; 1713 } 1714 1715 1716 void WasapiCapture::start() 1717 { 1718 const HRESULT hr{pushMessage(MsgType::StartDevice).get()}; 1719 if(FAILED(hr)) 1720 throw al::backend_exception{al::backend_error::DeviceError, 1721 "Failed to start recording: 0x%lx", hr}; 1722 } 1723 1724 HRESULT WasapiCapture::startProxy() 1725 { 1726 ResetEvent(mNotifyEvent); 1727 1728 HRESULT hr{mClient->Start()}; 1729 if(FAILED(hr)) 1730 { 1731 ERR("Failed to start audio client: 0x%08lx\n", hr); 1732 return hr; 1733 } 1734 1735 void *ptr; 1736 hr = mClient->GetService(IID_IAudioCaptureClient, &ptr); 1737 if(SUCCEEDED(hr)) 1738 { 1739 mCapture = ComPtr<IAudioCaptureClient>{static_cast<IAudioCaptureClient*>(ptr)}; 1740 try { 1741 mKillNow.store(false, std::memory_order_release); 1742 mThread = std::thread{std::mem_fn(&WasapiCapture::recordProc), this}; 1743 } 1744 catch(...) { 1745 mCapture = nullptr; 1746 ERR("Failed to start thread\n"); 1747 hr = E_FAIL; 1748 } 1749 } 1750 1751 if(FAILED(hr)) 1752 { 1753 mClient->Stop(); 1754 mClient->Reset(); 1755 } 1756 1757 return hr; 1758 } 1759 1760 1761 void WasapiCapture::stop() 1762 { pushMessage(MsgType::StopDevice).wait(); } 1763 1764 void WasapiCapture::stopProxy() 1765 { 1766 if(!mCapture || !mThread.joinable()) 1767 return; 1768 1769 mKillNow.store(true, std::memory_order_release); 1770 mThread.join(); 1771 1772 mCapture = nullptr; 1773 mClient->Stop(); 1774 mClient->Reset(); 1775 } 1776 1777 1778 void WasapiCapture::captureSamples(al::byte *buffer, uint samples) 1779 { mRing->read(buffer, samples); } 1780 1781 uint WasapiCapture::availableSamples() 1782 { return static_cast<uint>(mRing->readSpace()); } 1783 1784 } // namespace 1785 1786 1787 bool WasapiBackendFactory::init() 1788 { 1789 static HRESULT InitResult{E_FAIL}; 1790 1791 if(FAILED(InitResult)) try 1792 { 1793 std::promise<HRESULT> promise; 1794 auto future = promise.get_future(); 1795 1796 std::thread{&WasapiProxy::messageHandler, &promise}.detach(); 1797 InitResult = future.get(); 1798 } 1799 catch(...) { 1800 } 1801 1802 return SUCCEEDED(InitResult); 1803 } 1804 1805 bool WasapiBackendFactory::querySupport(BackendType type) 1806 { return type == BackendType::Playback || type == BackendType::Capture; } 1807 1808 std::string WasapiBackendFactory::probe(BackendType type) 1809 { 1810 std::string outnames; 1811 auto add_device = [&outnames](const DevMap &entry) -> void 1812 { 1813 /* +1 to also append the null char (to ensure a null-separated list and 1814 * double-null terminated list). 1815 */ 1816 outnames.append(entry.name.c_str(), entry.name.length()+1); 1817 }; 1818 1819 switch(type) 1820 { 1821 case BackendType::Playback: 1822 WasapiProxy::pushMessageStatic(MsgType::EnumeratePlayback).wait(); 1823 std::for_each(PlaybackDevices.cbegin(), PlaybackDevices.cend(), add_device); 1824 break; 1825 1826 case BackendType::Capture: 1827 WasapiProxy::pushMessageStatic(MsgType::EnumerateCapture).wait(); 1828 std::for_each(CaptureDevices.cbegin(), CaptureDevices.cend(), add_device); 1829 break; 1830 } 1831 1832 return outnames; 1833 } 1834 1835 BackendPtr WasapiBackendFactory::createBackend(ALCdevice *device, BackendType type) 1836 { 1837 if(type == BackendType::Playback) 1838 return BackendPtr{new WasapiPlayback{device}}; 1839 if(type == BackendType::Capture) 1840 return BackendPtr{new WasapiCapture{device}}; 1841 return nullptr; 1842 } 1843 1844 BackendFactory &WasapiBackendFactory::getFactory() 1845 { 1846 static WasapiBackendFactory factory{}; 1847 return factory; 1848 } 1849