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Diffstat (limited to '3rdparty/portaudio/include/pa_win_wasapi.h')
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diff --git a/3rdparty/portaudio/include/pa_win_wasapi.h b/3rdparty/portaudio/include/pa_win_wasapi.h new file mode 100644 index 0000000..c046afd --- /dev/null +++ b/3rdparty/portaudio/include/pa_win_wasapi.h @@ -0,0 +1,729 @@ +#ifndef PA_WIN_WASAPI_H +#define PA_WIN_WASAPI_H +/* + * $Id: $ + * PortAudio Portable Real-Time Audio Library + * WASAPI specific extensions + * + * Copyright (c) 1999-2018 Ross Bencina and Phil Burk + * Copyright (c) 2006-2010 David Viens + * Copyright (c) 2010-2018 Dmitry Kostjuchenko + * + * Permission is hereby granted, free of charge, to any person obtaining + * a copy of this software and associated documentation files + * (the "Software"), to deal in the Software without restriction, + * including without limitation the rights to use, copy, modify, merge, + * publish, distribute, sublicense, and/or sell copies of the Software, + * and to permit persons to whom the Software is furnished to do so, + * subject to the following conditions: + * + * The above copyright notice and this permission notice shall be + * included in all copies or substantial portions of the Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, + * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF + * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. + * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR + * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF + * CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION + * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. + */ + +/* + * The text above constitutes the entire PortAudio license; however, + * the PortAudio community also makes the following non-binding requests: + * + * Any person wishing to distribute modifications to the Software is + * requested to send the modifications to the original developer so that + * they can be incorporated into the canonical version. It is also + * requested that these non-binding requests be included along with the + * license above. + */ + +/** @file + @ingroup public_header + @brief WASAPI-specific PortAudio API extension header file. +*/ + +#include "portaudio.h" +#include "pa_win_waveformat.h" + +#ifdef __cplusplus +extern "C" +{ +#endif /* __cplusplus */ + + +/* Stream setup flags. */ +typedef enum PaWasapiFlags +{ + /* put WASAPI into exclusive mode */ + paWinWasapiExclusive = (1 << 0), + + /* allow to skip internal PA processing completely */ + paWinWasapiRedirectHostProcessor = (1 << 1), + + /* assign custom channel mask */ + paWinWasapiUseChannelMask = (1 << 2), + + /* select non-Event driven method of data read/write + Note: WASAPI Event driven core is capable of 2ms latency!!!, but Polling + method can only provide 15-20ms latency. */ + paWinWasapiPolling = (1 << 3), + + /* force custom thread priority setting, must be used if PaWasapiStreamInfo::threadPriority + is set to a custom value */ + paWinWasapiThreadPriority = (1 << 4), + + /* force explicit sample format and do not allow PA to select suitable working format, API will + fail if provided sample format is not supported by audio hardware in Exclusive mode + or system mixer in Shared mode */ + paWinWasapiExplicitSampleFormat = (1 << 5), + + /* allow API to insert system-level channel matrix mixer and sample rate converter to allow + playback formats that do not match the current configured system settings. + this is in particular required for streams not matching the system mixer sample rate. + only applies in Shared mode. */ + paWinWasapiAutoConvert = (1 << 6) +} +PaWasapiFlags; +#define paWinWasapiExclusive (paWinWasapiExclusive) +#define paWinWasapiRedirectHostProcessor (paWinWasapiRedirectHostProcessor) +#define paWinWasapiUseChannelMask (paWinWasapiUseChannelMask) +#define paWinWasapiPolling (paWinWasapiPolling) +#define paWinWasapiThreadPriority (paWinWasapiThreadPriority) +#define paWinWasapiExplicitSampleFormat (paWinWasapiExplicitSampleFormat) +#define paWinWasapiAutoConvert (paWinWasapiAutoConvert) + + +/* Stream state. + + @note Multiple states can be united into a bitmask. + @see PaWasapiStreamStateCallback, PaWasapi_SetStreamStateHandler +*/ +typedef enum PaWasapiStreamState +{ + /* state change was caused by the error: + + Example: + 1) If thread execution stopped due to AUDCLNT_E_RESOURCES_INVALIDATED then state + value will contain paWasapiStreamStateError|paWasapiStreamStateThreadStop. + */ + paWasapiStreamStateError = (1 << 0), + + /* processing thread is preparing to start execution */ + paWasapiStreamStateThreadPrepare = (1 << 1), + + /* processing thread started execution (enters its loop) */ + paWasapiStreamStateThreadStart = (1 << 2), + + /* processing thread stopped execution */ + paWasapiStreamStateThreadStop = (1 << 3) +} +PaWasapiStreamState; +#define paWasapiStreamStateError (paWasapiStreamStateError) +#define paWasapiStreamStateThreadPrepare (paWasapiStreamStateThreadPrepare) +#define paWasapiStreamStateThreadStart (paWasapiStreamStateThreadStart) +#define paWasapiStreamStateThreadStop (paWasapiStreamStateThreadStop) + + +/* Host processor. + + Allows to skip internal PA processing completely. paWinWasapiRedirectHostProcessor flag + must be set to the PaWasapiStreamInfo::flags member in order to have host processor + redirected to this callback. + + Use with caution! inputFrames and outputFrames depend solely on final device setup. + To query max values of inputFrames/outputFrames use PaWasapi_GetFramesPerHostBuffer. +*/ +typedef void (*PaWasapiHostProcessorCallback) (void *inputBuffer, long inputFrames, + void *outputBuffer, long outputFrames, void *userData); + + +/* Stream state handler. + + @param pStream Pointer to PaStream object. + @param stateFlags State flags, a collection of values from PaWasapiStreamState enum. + @param errorId Error id provided by system API (HRESULT). + @param userData Pointer to user data. + + @see PaWasapiStreamState +*/ +typedef void (*PaWasapiStreamStateCallback) (PaStream *pStream, unsigned int stateFlags, + unsigned int errorId, void *pUserData); + + +/* Device role. */ +typedef enum PaWasapiDeviceRole +{ + eRoleRemoteNetworkDevice = 0, + eRoleSpeakers, + eRoleLineLevel, + eRoleHeadphones, + eRoleMicrophone, + eRoleHeadset, + eRoleHandset, + eRoleUnknownDigitalPassthrough, + eRoleSPDIF, + eRoleHDMI, + eRoleUnknownFormFactor +} +PaWasapiDeviceRole; + + +/* Jack connection type. */ +typedef enum PaWasapiJackConnectionType +{ + eJackConnTypeUnknown, + eJackConnType3Point5mm, + eJackConnTypeQuarter, + eJackConnTypeAtapiInternal, + eJackConnTypeRCA, + eJackConnTypeOptical, + eJackConnTypeOtherDigital, + eJackConnTypeOtherAnalog, + eJackConnTypeMultichannelAnalogDIN, + eJackConnTypeXlrProfessional, + eJackConnTypeRJ11Modem, + eJackConnTypeCombination +} +PaWasapiJackConnectionType; + + +/* Jack geometric location. */ +typedef enum PaWasapiJackGeoLocation +{ + eJackGeoLocUnk = 0, + eJackGeoLocRear = 0x1, /* matches EPcxGeoLocation::eGeoLocRear */ + eJackGeoLocFront, + eJackGeoLocLeft, + eJackGeoLocRight, + eJackGeoLocTop, + eJackGeoLocBottom, + eJackGeoLocRearPanel, + eJackGeoLocRiser, + eJackGeoLocInsideMobileLid, + eJackGeoLocDrivebay, + eJackGeoLocHDMI, + eJackGeoLocOutsideMobileLid, + eJackGeoLocATAPI, + eJackGeoLocReserved5, + eJackGeoLocReserved6, +} +PaWasapiJackGeoLocation; + + +/* Jack general location. */ +typedef enum PaWasapiJackGenLocation +{ + eJackGenLocPrimaryBox = 0, + eJackGenLocInternal, + eJackGenLocSeparate, + eJackGenLocOther +} +PaWasapiJackGenLocation; + + +/* Jack's type of port. */ +typedef enum PaWasapiJackPortConnection +{ + eJackPortConnJack = 0, + eJackPortConnIntegratedDevice, + eJackPortConnBothIntegratedAndJack, + eJackPortConnUnknown +} +PaWasapiJackPortConnection; + + +/* Thread priority. */ +typedef enum PaWasapiThreadPriority +{ + eThreadPriorityNone = 0, + eThreadPriorityAudio, //!< Default for Shared mode. + eThreadPriorityCapture, + eThreadPriorityDistribution, + eThreadPriorityGames, + eThreadPriorityPlayback, + eThreadPriorityProAudio, //!< Default for Exclusive mode. + eThreadPriorityWindowManager +} +PaWasapiThreadPriority; + + +/* Stream descriptor. */ +typedef struct PaWasapiJackDescription +{ + unsigned long channelMapping; + unsigned long color; /* derived from macro: #define RGB(r,g,b) ((COLORREF)(((BYTE)(r)|((WORD)((BYTE)(g))<<8))|(((DWORD)(BYTE)(b))<<16))) */ + PaWasapiJackConnectionType connectionType; + PaWasapiJackGeoLocation geoLocation; + PaWasapiJackGenLocation genLocation; + PaWasapiJackPortConnection portConnection; + unsigned int isConnected; +} +PaWasapiJackDescription; + + +/** Stream category. + Note: + - values are equal to WASAPI AUDIO_STREAM_CATEGORY enum + - supported since Windows 8.0, noop on earlier versions + - values 1,2 are deprecated on Windows 10 and not included into enumeration + + @version Available as of 19.6.0 +*/ +typedef enum PaWasapiStreamCategory +{ + eAudioCategoryOther = 0, + eAudioCategoryCommunications = 3, + eAudioCategoryAlerts = 4, + eAudioCategorySoundEffects = 5, + eAudioCategoryGameEffects = 6, + eAudioCategoryGameMedia = 7, + eAudioCategoryGameChat = 8, + eAudioCategorySpeech = 9, + eAudioCategoryMovie = 10, + eAudioCategoryMedia = 11 +} +PaWasapiStreamCategory; + + +/** Stream option. + Note: + - values are equal to WASAPI AUDCLNT_STREAMOPTIONS enum + - supported since Windows 8.1, noop on earlier versions + + @version Available as of 19.6.0 +*/ +typedef enum PaWasapiStreamOption +{ + eStreamOptionNone = 0, //!< default + eStreamOptionRaw = 1, //!< bypass WASAPI Audio Engine DSP effects, supported since Windows 8.1 + eStreamOptionMatchFormat = 2 //!< force WASAPI Audio Engine into a stream format, supported since Windows 10 +} +PaWasapiStreamOption; + + +/* Stream descriptor. */ +typedef struct PaWasapiStreamInfo +{ + unsigned long size; /**< sizeof(PaWasapiStreamInfo) */ + PaHostApiTypeId hostApiType; /**< paWASAPI */ + unsigned long version; /**< 1 */ + + unsigned long flags; /**< collection of PaWasapiFlags */ + + /** Support for WAVEFORMATEXTENSIBLE channel masks. If flags contains + paWinWasapiUseChannelMask this allows you to specify which speakers + to address in a multichannel stream. Constants for channelMask + are specified in pa_win_waveformat.h. Will be used only if + paWinWasapiUseChannelMask flag is specified. + */ + PaWinWaveFormatChannelMask channelMask; + + /** Delivers raw data to callback obtained from GetBuffer() methods skipping + internal PortAudio processing inventory completely. userData parameter will + be the same that was passed to Pa_OpenStream method. Will be used only if + paWinWasapiRedirectHostProcessor flag is specified. + */ + PaWasapiHostProcessorCallback hostProcessorOutput; + PaWasapiHostProcessorCallback hostProcessorInput; + + /** Specifies thread priority explicitly. Will be used only if paWinWasapiThreadPriority flag + is specified. + + Please note, if Input/Output streams are opened simultaneously (Full-Duplex mode) + you shall specify same value for threadPriority or othervise one of the values will be used + to setup thread priority. + */ + PaWasapiThreadPriority threadPriority; + + /** Stream category. + @see PaWasapiStreamCategory + @version Available as of 19.6.0 + */ + PaWasapiStreamCategory streamCategory; + + /** Stream option. + @see PaWasapiStreamOption + @version Available as of 19.6.0 + */ + PaWasapiStreamOption streamOption; +} +PaWasapiStreamInfo; + + +/** Returns pointer to WASAPI's IAudioClient object of the stream. + + @param pStream Pointer to PaStream object. + @param pAudioClient Pointer to pointer of IAudioClient. + @param bOutput TRUE (1) for output stream, FALSE (0) for input stream. + + @return Error code indicating success or failure. +*/ +PaError PaWasapi_GetAudioClient( PaStream *pStream, void **pAudioClient, int bOutput ); + + +/** Update device list. + + This function is available if PA_WASAPI_MAX_CONST_DEVICE_COUNT is defined during compile time + with maximum constant WASAPI device count (recommended value - 32). + If PA_WASAPI_MAX_CONST_DEVICE_COUNT is set to 0 (or not defined) during compile time the implementation + will not define PaWasapi_UpdateDeviceList() and thus updating device list can only be possible by calling + Pa_Terminate() and then Pa_Initialize(). + + @return Error code indicating success or failure. +*/ +PaError PaWasapi_UpdateDeviceList(); + + +/** Get current audio format of the device assigned to the opened stream. + + Format is represented by PaWinWaveFormat or WAVEFORMATEXTENSIBLE structure. + Use this function to reconfirm format if PA's processor is overridden and + paWinWasapiRedirectHostProcessor flag is specified. + + @param pStream Pointer to PaStream object. + @param pFormat Pointer to PaWinWaveFormat or WAVEFORMATEXTENSIBLE structure. + @param formatSize Size of PaWinWaveFormat or WAVEFORMATEXTENSIBLE structure in bytes. + @param bOutput TRUE (1) for output stream, FALSE (0) for input stream. + + @return Non-negative value indicating the number of bytes copied into format descriptor + or, a PaErrorCode (which is always negative) if PortAudio is not initialized + or an error is encountered. +*/ +int PaWasapi_GetDeviceCurrentFormat( PaStream *pStream, void *pFormat, unsigned int formatSize, int bOutput ); + + +/** Get default audio format for the device in Shared Mode. + + Format is represented by PaWinWaveFormat or WAVEFORMATEXTENSIBLE structure and obtained + by getting the device property with a PKEY_AudioEngine_DeviceFormat key. + + @param pFormat Pointer to PaWinWaveFormat or WAVEFORMATEXTENSIBLE structure. + @param formatSize Size of PaWinWaveFormat or WAVEFORMATEXTENSIBLE structure in bytes. + @param device Device index. + + @return Non-negative value indicating the number of bytes copied into format descriptor + or, a PaErrorCode (which is always negative) if PortAudio is not initialized + or an error is encountered. +*/ +int PaWasapi_GetDeviceDefaultFormat( void *pFormat, unsigned int formatSize, PaDeviceIndex device ); + + +/** Get mix audio format for the device in Shared Mode. + + Format is represented by PaWinWaveFormat or WAVEFORMATEXTENSIBLE structureand obtained by + IAudioClient::GetMixFormat. + + @param pFormat Pointer to PaWinWaveFormat or WAVEFORMATEXTENSIBLE structure. + @param formatSize Size of PaWinWaveFormat or WAVEFORMATEXTENSIBLE structure in bytes. + @param device Device index. + + @return Non-negative value indicating the number of bytes copied into format descriptor + or, a PaErrorCode (which is always negative) if PortAudio is not initialized + or an error is encountered. +*/ +int PaWasapi_GetDeviceMixFormat( void *pFormat, unsigned int formatSize, PaDeviceIndex device ); + + +/** Get device role (PaWasapiDeviceRole enum). + + @param device Device index. + + @return Non-negative value indicating device role or, a PaErrorCode (which is always negative) + if PortAudio is not initialized or an error is encountered. +*/ +int/*PaWasapiDeviceRole*/ PaWasapi_GetDeviceRole( PaDeviceIndex device ); + + +/** Get device IMMDevice pointer + + @param device Device index. + @param pAudioClient Pointer to pointer of IMMDevice. + + @return Error code indicating success or failure. +*/ +PaError PaWasapi_GetIMMDevice( PaDeviceIndex device, void **pIMMDevice ); + + +/** Boost thread priority of calling thread (MMCSS). + + Use it for Blocking Interface only inside the thread which makes calls to Pa_WriteStream/Pa_ReadStream. + + @param pTask Handle to pointer to priority task. Must be used with PaWasapi_RevertThreadPriority + method to revert thread priority to initial state. + + @param priorityClass Id of thread priority of PaWasapiThreadPriority type. Specifying + eThreadPriorityNone does nothing. + + @return Error code indicating success or failure. + @see PaWasapi_RevertThreadPriority +*/ +PaError PaWasapi_ThreadPriorityBoost( void **pTask, PaWasapiThreadPriority priorityClass ); + + +/** Boost thread priority of calling thread (MMCSS). + + Use it for Blocking Interface only inside the thread which makes calls to Pa_WriteStream/Pa_ReadStream. + + @param pTask Task handle obtained by PaWasapi_BoostThreadPriority method. + + @return Error code indicating success or failure. + @see PaWasapi_BoostThreadPriority +*/ +PaError PaWasapi_ThreadPriorityRevert( void *pTask ); + + +/** Get number of frames per host buffer. + + It is max value of frames of WASAPI buffer which can be locked for operations. + Use this method as helper to find out max values of inputFrames/outputFrames + of PaWasapiHostProcessorCallback. + + @param pStream Pointer to PaStream object. + @param pInput Pointer to variable to receive number of input frames. Can be NULL. + @param pOutput Pointer to variable to receive number of output frames. Can be NULL. + + @return Error code indicating success or failure. + @see PaWasapiHostProcessorCallback +*/ +PaError PaWasapi_GetFramesPerHostBuffer( PaStream *pStream, unsigned int *pInput, unsigned int *pOutput ); + + +/** Get number of jacks associated with a WASAPI device. + + Use this method to determine if there are any jacks associated with the provided WASAPI device. + Not all audio devices will support this capability. This is valid for both input and output devices. + + @note Not available on UWP platform. + + @param device Device index. + @param pJackCount Pointer to variable to receive number of jacks. + + @return Error code indicating success or failure. + @see PaWasapi_GetJackDescription + */ +PaError PaWasapi_GetJackCount( PaDeviceIndex device, int *pJackCount ); + + +/** Get the jack description associated with a WASAPI device and jack number. + + Before this function is called, use PaWasapi_GetJackCount to determine the + number of jacks associated with device. If jcount is greater than zero, then + each jack from 0 to jcount can be queried with this function to get the jack + description. + + @note Not available on UWP platform. + + @param device Device index. + @param jackIndex Jack index. + @param pJackDescription Pointer to PaWasapiJackDescription. + + @return Error code indicating success or failure. + @see PaWasapi_GetJackCount + */ +PaError PaWasapi_GetJackDescription( PaDeviceIndex device, int jackIndex, PaWasapiJackDescription *pJackDescription ); + + +/** Set stream state handler. + + @param pStream Pointer to PaStream object. + @param fnStateHandler Pointer to state handling function. + @param pUserData Pointer to user data. + + @return Error code indicating success or failure. +*/ +PaError PaWasapi_SetStreamStateHandler( PaStream *pStream, PaWasapiStreamStateCallback fnStateHandler, void *pUserData ); + + +/** Set default device Id. + + By default implementation will use the DEVINTERFACE_AUDIO_RENDER and + DEVINTERFACE_AUDIO_CAPTURE Ids if device Id is not provided explicitly. These default Ids + will not allow to use Exclusive mode on UWP/WinRT platform and thus you must provide + device Id explicitly via this API before calling the Pa_OpenStream(). + + Device Ids on UWP platform are obtainable via: + Windows::Media::Devices::MediaDevice::GetDefaultAudioRenderId() or + Windows::Media::Devices::MediaDevice::GetDefaultAudioCaptureId() API. + + After the call completes, memory referenced by pointers can be freed, as implementation keeps its own copy. + + Call this function before calling Pa_IsFormatSupported() when Exclusive mode is requested. + + See an example in the IMPORTANT notes. + + @note UWP/WinRT platform only. + + @param pId Device Id, pointer to the 16-bit Unicode string (WCHAR). If NULL then device Id + will be reset to the default, e.g. DEVINTERFACE_AUDIO_RENDER or DEVINTERFACE_AUDIO_CAPTURE. + @param bOutput TRUE (1) for output (render), FALSE (0) for input (capture). + + @return Error code indicating success or failure. Will return paIncompatibleStreamHostApi if library is not compiled + for UWP/WinRT platform. If Id is longer than PA_WASAPI_DEVICE_ID_LEN characters paBufferTooBig will + be returned. +*/ +PaError PaWasapiWinrt_SetDefaultDeviceId( const unsigned short *pId, int bOutput ); + + +/** Populate the device list. + + By default the implementation will rely on DEVINTERFACE_AUDIO_RENDER and DEVINTERFACE_AUDIO_CAPTURE as + default devices. If device Id is provided by PaWasapiWinrt_SetDefaultDeviceId() then those + device Ids will be used as default and only devices for the device list. + + By populating the device list you can provide an additional available audio devices of the system to PA + which are obtainable by: + Windows::Devices::Enumeration::DeviceInformation::FindAllAsync(selector) where selector is obtainable by + Windows::Media::Devices::MediaDevice::GetAudioRenderSelector() or + Windows::Media::Devices::MediaDevice::GetAudioCaptureSelector() API. + + After the call completes, memory referenced by pointers can be freed, as implementation keeps its own copy. + + You must call PaWasapi_UpdateDeviceList() to update the internal device list of the implementation after + calling this function. + + See an example in the IMPORTANT notes. + + @note UWP/WinRT platform only. + + @param pId Array of device Ids, pointer to the array of pointers of 16-bit Unicode string (WCHAR). If NULL + and count is also 0 then device Ids will be reset to the default. Required. + @param pName Array of device Names, pointer to the array of pointers of 16-bit Unicode string (WCHAR). Optional. + @param pRole Array of device Roles, see PaWasapiDeviceRole and PaWasapi_GetDeviceRole() for more details. Optional. + @param count Number of devices, the number of array elements (pId, pName, pRole). Maximum count of devices + is limited by PA_WASAPI_DEVICE_MAX_COUNT. + @param bOutput TRUE (1) for output (render), FALSE (0) for input (capture). + + @return Error code indicating success or failure. Will return paIncompatibleStreamHostApi if library is not compiled + for UWP/WinRT platform. If Id is longer than PA_WASAPI_DEVICE_ID_LEN characters paBufferTooBig will + be returned. If Name is longer than PA_WASAPI_DEVICE_NAME_LEN characters paBufferTooBig will + be returned. +*/ +PaError PaWasapiWinrt_PopulateDeviceList( const unsigned short **pId, const unsigned short **pName, + const PaWasapiDeviceRole *pRole, unsigned int count, int bOutput ); + + +/* + IMPORTANT: + + WASAPI is implemented for Callback and Blocking interfaces. It supports Shared and Exclusive + share modes. + + Exclusive Mode: + + Exclusive mode allows to deliver audio data directly to hardware bypassing + software mixing. + Exclusive mode is specified by 'paWinWasapiExclusive' flag. + + Callback Interface: + + Provides best audio quality with low latency. Callback interface is implemented in + two versions: + + 1) Event-Driven: + This is the most powerful WASAPI implementation which provides glitch-free + audio at around 3ms latency in Exclusive mode. Lowest possible latency for this mode is + 3 ms for HD Audio class audio chips. For the Shared mode latency can not be + lower than 20 ms. + + 2) Poll-Driven: + Polling is another 2-nd method to operate with WASAPI. It is less efficient than Event-Driven + and provides latency at around 10-13ms. Polling must be used to overcome a system bug + under Windows Vista x64 when application is WOW64(32-bit) and Event-Driven method simply + times out (event handle is never signalled on buffer completion). Please note, such WOW64 bug + does not exist in Vista x86 or Windows 7. + Polling can be setup by specifying 'paWinWasapiPolling' flag. Our WASAPI implementation detects + WOW64 bug and sets 'paWinWasapiPolling' automatically. + + Thread priority: + + Normally thread priority is set automatically and does not require modification. Although + if user wants some tweaking thread priority can be modified by setting 'paWinWasapiThreadPriority' + flag and specifying 'PaWasapiStreamInfo::threadPriority' with value from PaWasapiThreadPriority + enum. + + Blocking Interface: + + Blocking interface is implemented but due to above described Poll-Driven method can not + deliver lowest possible latency. Specifying too low latency in Shared mode will result in + distorted audio although Exclusive mode adds stability. + + 8.24 format: + + If paCustomFormat is specified as sample format then the implementation will understand it + as valid 24-bits inside 32-bit container (e.g. wBitsPerSample = 32, Samples.wValidBitsPerSample = 24). + + By using paCustomFormat there will be small optimization when samples are be copied + with Copy_24_To_24 by PA processor instead of conversion from packed 3-byte (24-bit) data + with Int24_To_Int32. + + Pa_IsFormatSupported: + + To check format with correct Share Mode (Exclusive/Shared) you must supply PaWasapiStreamInfo + with flags paWinWasapiExclusive set through member of PaStreamParameters::hostApiSpecificStreamInfo + structure. + + If paWinWasapiExplicitSampleFormat flag is provided then implementation will not try to select + suitable close format and will return an error instead of paFormatIsSupported. By specifying + paWinWasapiExplicitSampleFormat flag it is possible to find out what sample formats are + supported by Exclusive or Shared modes. + + Pa_OpenStream: + + To set desired Share Mode (Exclusive/Shared) you must supply + PaWasapiStreamInfo with flags paWinWasapiExclusive set through member of + PaStreamParameters::hostApiSpecificStreamInfo structure. + + Coding style for parameters and structure members of the public API: + + 1) bXXX - boolean, [1 (TRUE), 0 (FALSE)] + 2) pXXX - pointer + 3) fnXXX - pointer to function + 4) structure members are never prefixed with a type distinguisher + + + UWP/WinRT: + + This platform has number of limitations which do not allow to enumerate audio devices without + an additional external help. Enumeration is possible though from C++/CX, check the related API + Windows::Devices::Enumeration::DeviceInformation::FindAllAsync(). + + The main limitation is an absence of the device enumeration from inside the PA's implementation. + This problem can be solved by using the following functions: + + PaWasapiWinrt_SetDefaultDeviceId() - to set default input/output device, + PaWasapiWinrt_PopulateDeviceList() - to populate device list with devices. + + Here is an example of populating the device list which can also be updated dynamically depending on + whether device was removed from or added to the system: + + ---------------- + + std::vector<const UINT16 *> ids, names; + std::vector<PaWasapiDeviceRole> role; + + ids.resize(count); + names.resize(count); + role.resize(count); + + for (UINT32 i = 0; i < count; ++i) + { + ids[i] = (const UINT16 *)device_ids[i].c_str(); + names[i] = (const UINT16 *)device_names[i].c_str(); + role[i] = eRoleUnknownFormFactor; + } + + PaWasapiWinrt_SetDefaultDeviceId((const UINT16 *)default_device_id.c_str(), !capture); + PaWasapiWinrt_PopulateDeviceList(ids.data(), names.data(), role.data(), count, !capture); + PaWasapi_UpdateDeviceList(); + + ---------------- +*/ + +#ifdef __cplusplus +} +#endif /* __cplusplus */ + +#endif /* PA_WIN_WASAPI_H */ |