mirror of https://github.com/PCSX2/pcsx2.git
289 lines
11 KiB
C
289 lines
11 KiB
C
#ifndef PA_WIN_WASAPI_H
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#define PA_WIN_WASAPI_H
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/*
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* $Id: $
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* PortAudio Portable Real-Time Audio Library
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* DirectSound specific extensions
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*
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* Copyright (c) 1999-2007 Ross Bencina and Phil Burk
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*
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* Permission is hereby granted, free of charge, to any person obtaining
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* a copy of this software and associated documentation files
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* (the "Software"), to deal in the Software without restriction,
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* including without limitation the rights to use, copy, modify, merge,
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* publish, distribute, sublicense, and/or sell copies of the Software,
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* and to permit persons to whom the Software is furnished to do so,
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* subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR
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* ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF
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* CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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/*
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* The text above constitutes the entire PortAudio license; however,
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* the PortAudio community also makes the following non-binding requests:
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*
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* Any person wishing to distribute modifications to the Software is
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* requested to send the modifications to the original developer so that
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* they can be incorporated into the canonical version. It is also
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* requested that these non-binding requests be included along with the
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* license above.
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*/
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/** @file
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@ingroup public_header
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@brief WASAPI-specific PortAudio API extension header file.
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*/
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#include "portaudio.h"
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#include "pa_win_waveformat.h"
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#ifdef __cplusplus
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extern "C"
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{
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#endif /* __cplusplus */
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/* Setup flags */
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typedef enum PaWasapiFlags
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{
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/* puts WASAPI into exclusive mode */
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paWinWasapiExclusive = (1 << 0),
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/* allows to skip internal PA processing completely */
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paWinWasapiRedirectHostProcessor = (1 << 1),
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/* assigns custom channel mask */
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paWinWasapiUseChannelMask = (1 << 2),
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/* selects non-Event driven method of data read/write
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Note: WASAPI Event driven core is capable of 2ms latency!!!, but Polling
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method can only provide 15-20ms latency. */
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paWinWasapiPolling = (1 << 3),
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/* forces custom thread priority setting. must be used if PaWasapiStreamInfo::threadPriority
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is set to custom value. */
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paWinWasapiThreadPriority = (1 << 4)
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}
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PaWasapiFlags;
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#define paWinWasapiExclusive (paWinWasapiExclusive)
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#define paWinWasapiRedirectHostProcessor (paWinWasapiRedirectHostProcessor)
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#define paWinWasapiUseChannelMask (paWinWasapiUseChannelMask)
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#define paWinWasapiPolling (paWinWasapiPolling)
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#define paWinWasapiThreadPriority (paWinWasapiThreadPriority)
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/* Host processor. Allows to skip internal PA processing completely.
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You must set paWinWasapiRedirectHostProcessor flag to PaWasapiStreamInfo::flags member
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in order to have host processor redirected to your callback.
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Use with caution! inputFrames and outputFrames depend solely on final device setup.
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To query maximal values of inputFrames/outputFrames use PaWasapi_GetFramesPerHostBuffer.
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*/
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typedef void (*PaWasapiHostProcessorCallback) (void *inputBuffer, long inputFrames,
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void *outputBuffer, long outputFrames,
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void *userData);
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/* Device role */
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typedef enum PaWasapiDeviceRole
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{
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eRoleRemoteNetworkDevice = 0,
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eRoleSpeakers,
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eRoleLineLevel,
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eRoleHeadphones,
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eRoleMicrophone,
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eRoleHeadset,
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eRoleHandset,
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eRoleUnknownDigitalPassthrough,
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eRoleSPDIF,
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eRoleHDMI,
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eRoleUnknownFormFactor
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}
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PaWasapiDeviceRole;
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/* Thread priority */
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typedef enum PaWasapiThreadPriority
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{
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eThreadPriorityNone = 0,
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eThreadPriorityAudio, //!< Default for Shared mode.
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eThreadPriorityCapture,
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eThreadPriorityDistribution,
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eThreadPriorityGames,
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eThreadPriorityPlayback,
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eThreadPriorityProAudio, //!< Default for Exclusive mode.
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eThreadPriorityWindowManager
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}
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PaWasapiThreadPriority;
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/* Stream descriptor. */
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typedef struct PaWasapiStreamInfo
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{
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unsigned long size; /**< sizeof(PaWasapiStreamInfo) */
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PaHostApiTypeId hostApiType; /**< paWASAPI */
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unsigned long version; /**< 1 */
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unsigned long flags; /**< collection of PaWasapiFlags */
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/* Support for WAVEFORMATEXTENSIBLE channel masks. If flags contains
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paWinWasapiUseChannelMask this allows you to specify which speakers
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to address in a multichannel stream. Constants for channelMask
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are specified in pa_win_waveformat.h. Will be used only if
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paWinWasapiUseChannelMask flag is specified.
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*/
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PaWinWaveFormatChannelMask channelMask;
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/* Delivers raw data to callback obtained from GetBuffer() methods skipping
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internal PortAudio processing inventory completely. userData parameter will
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be the same that was passed to Pa_OpenStream method. Will be used only if
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paWinWasapiRedirectHostProcessor flag is specified.
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*/
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PaWasapiHostProcessorCallback hostProcessorOutput;
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PaWasapiHostProcessorCallback hostProcessorInput;
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/* Specifies thread priority explicitly. Will be used only if paWinWasapiThreadPriority flag
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is specified.
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Please note, if Input/Output streams are opened simultaniously (Full-Duplex mode)
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you shall specify same value for threadPriority or othervise one of the values will be used
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to setup thread priority.
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*/
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PaWasapiThreadPriority threadPriority;
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}
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PaWasapiStreamInfo;
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/** Returns default sound format for device. Format is represented by PaWinWaveFormat or
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WAVEFORMATEXTENSIBLE structure.
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@param pFormat Pointer to PaWinWaveFormat or WAVEFORMATEXTENSIBLE structure.
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@param nFormatSize Size of PaWinWaveFormat or WAVEFORMATEXTENSIBLE structure in bytes.
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@param nDevice Device index.
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@return Non-negative value indicating the number of bytes copied into format decriptor
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or, a PaErrorCode (which are always negative) if PortAudio is not initialized
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or an error is encountered.
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*/
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int PaWasapi_GetDeviceDefaultFormat( void *pFormat, unsigned int nFormatSize, PaDeviceIndex nDevice );
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/** Returns device role (PaWasapiDeviceRole enum).
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@param nDevice device index.
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@return Non-negative value indicating device role or, a PaErrorCode (which are always negative)
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if PortAudio is not initialized or an error is encountered.
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*/
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int/*PaWasapiDeviceRole*/ PaWasapi_GetDeviceRole( PaDeviceIndex nDevice );
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/** Boost thread priority of calling thread (MMCSS). Use it for Blocking Interface only for thread
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which makes calls to Pa_WriteStream/Pa_ReadStream.
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@param hTask Handle to pointer to priority task. Must be used with PaWasapi_RevertThreadPriority
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method to revert thread priority to initial state.
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@param nPriorityClass Id of thread priority of PaWasapiThreadPriority type. Specifying
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eThreadPriorityNone does nothing.
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@return Error code indicating success or failure.
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@see PaWasapi_RevertThreadPriority
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*/
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PaError PaWasapi_ThreadPriorityBoost( void **hTask, PaWasapiThreadPriority nPriorityClass );
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/** Boost thread priority of calling thread (MMCSS). Use it for Blocking Interface only for thread
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which makes calls to Pa_WriteStream/Pa_ReadStream.
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@param hTask Task handle obtained by PaWasapi_BoostThreadPriority method.
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@return Error code indicating success or failure.
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@see PaWasapi_BoostThreadPriority
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*/
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PaError PaWasapi_ThreadPriorityRevert( void *hTask );
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/** Get number of frames per host buffer. This is maximal value of frames of WASAPI buffer which
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can be locked for operations. Use this method as helper to findout maximal values of
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inputFrames/outputFrames of PaWasapiHostProcessorCallback.
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@param pStream Pointer to PaStream to query.
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@param nInput Pointer to variable to receive number of input frames. Can be NULL.
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@param nOutput Pointer to variable to receive number of output frames. Can be NULL.
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@return Error code indicating success or failure.
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@see PaWasapiHostProcessorCallback
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*/
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PaError PaWasapi_GetFramesPerHostBuffer( PaStream *pStream, unsigned int *nInput, unsigned int *nOutput );
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/*
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IMPORTANT:
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WASAPI is implemented for Callback and Blocking interfaces. It supports Shared and Exclusive
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share modes.
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Exclusive Mode:
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Exclusive mode allows to deliver audio data directly to hardware bypassing
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software mixing.
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Exclusive mode is specified by 'paWinWasapiExclusive' flag.
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Callback Interface:
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Provides best audio quality with low latency. Callback interface is implemented in
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two versions:
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1) Event-Driven:
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This is the most powerful WASAPI implementation which provides glitch-free
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audio at around 3ms latency in Exclusive mode. Lowest possible latency for this mode is
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usually - 1.4(Vista only)-3ms(Windows 7+) for HD Audio class audio chips. For the
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Shared mode latency can not be lower than 20ms.
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2) Poll-Driven:
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Polling is another 2-nd method to operate with WASAPI. It is less efficient than Event-Driven
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and provides latency at around 10-13ms. Polling must be used to overcome a system bug
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under Windows Vista x64 when application is WOW64(32-bit) and Event-Driven method simply
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times out (event handle is never signalled on buffer completion). Please note, such WOW64 bug
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does not exist in Vista x86 or Windows 7.
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Polling can be setup by speciying 'paWinWasapiPolling' flag. Our WASAPI implementation detects
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WOW64 bug and sets 'paWinWasapiPolling' automatically.
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Thread priority:
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Normally thread priority is set automatically and does not require modification. Although
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if user wants some tweaking thread priority can be modified by setting 'paWinWasapiThreadPriority'
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flag and specifying 'PaWasapiStreamInfo::threadPriority' with value from PaWasapiThreadPriority
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enum.
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Blocking Interface:
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Blocking interface is implemented but due to above described Poll-Driven method can not
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deliver lowest possible latency. Specifying too low latency in Shared mode will result in
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distorted audio although Exclusive mode adds stability.
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Pa_IsFormatSupported:
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To check format with correct Share Mode (Exclusive/Shared) you must supply
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PaWasapiStreamInfo with flags paWinWasapiExclusive set through member of
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PaStreamParameters::hostApiSpecificStreamInfo structure.
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Pa_OpenStream:
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To set desired Share Mode (Exclusive/Shared) you must supply
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PaWasapiStreamInfo with flags paWinWasapiExclusive set through member of
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PaStreamParameters::hostApiSpecificStreamInfo structure.
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*/
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#ifdef __cplusplus
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}
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#endif /* __cplusplus */
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#endif /* PA_WIN_WASAPI_H */
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