#ifndef PA_WIN_WASAPI_H
#define PA_WIN_WASAPI_H
/*
 * $Id:  $
 * PortAudio Portable Real-Time Audio Library
 * DirectSound specific extensions
 *
 * Copyright (c) 1999-2007 Ross Bencina and Phil Burk
 *
 * 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 */


/* Setup flags */
typedef enum PaWasapiFlags
{
    /* puts WASAPI into exclusive mode */
    paWinWasapiExclusive                = (1 << 0),

    /* allows to skip internal PA processing completely */
    paWinWasapiRedirectHostProcessor    = (1 << 1),

    /* assigns custom channel mask */
    paWinWasapiUseChannelMask           = (1 << 2),

    /* selects 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),

    /* forces custom thread priority setting. must be used if PaWasapiStreamInfo::threadPriority 
       is set to custom value. */
    paWinWasapiThreadPriority           = (1 << 4)
}
PaWasapiFlags;
#define paWinWasapiExclusive             (paWinWasapiExclusive)
#define paWinWasapiRedirectHostProcessor (paWinWasapiRedirectHostProcessor)
#define paWinWasapiUseChannelMask        (paWinWasapiUseChannelMask)
#define paWinWasapiPolling               (paWinWasapiPolling)
#define paWinWasapiThreadPriority        (paWinWasapiThreadPriority)


/* Host processor. Allows to skip internal PA processing completely. 
   You must set paWinWasapiRedirectHostProcessor flag to PaWasapiStreamInfo::flags member
   in order to have host processor redirected to your callback.
   Use with caution! inputFrames and outputFrames depend solely on final device setup (buffer
   size is just recommendation) but are not changing during run-time once stream is started.
*/
typedef void (*PaWasapiHostProcessorCallback) (void *inputBuffer,  long inputFrames,
                                               void *outputBuffer, long outputFrames,
                                               void *userData);

/* Device role */
typedef enum PaWasapiDeviceRole
{
    eRoleRemoteNetworkDevice = 0,
    eRoleSpeakers,
    eRoleLineLevel,
    eRoleHeadphones,
    eRoleMicrophone,
    eRoleHeadset,
    eRoleHandset,
    eRoleUnknownDigitalPassthrough,
    eRoleSPDIF,
    eRoleHDMI,
    eRoleUnknownFormFactor
}
PaWasapiDeviceRole;


/* 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 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 simultaniously (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;
} 
PaWasapiStreamInfo;


/** Returns default sound format for device. Format is represented by PaWinWaveFormat or 
    WAVEFORMATEXTENSIBLE structure.

 @param pFormat pointer to PaWinWaveFormat or WAVEFORMATEXTENSIBLE structure.
 @param nFormatSize pize of PaWinWaveFormat or WAVEFORMATEXTENSIBLE structure in bytes.
 @param nDevice device index.

 @return A non-negative value indicating the number of bytes copied into format decriptor
         or, a PaErrorCode (which are always negative) if PortAudio is not initialized
         or an error is encountered.
*/
int PaWasapi_GetDeviceDefaultFormat( void *pFormat, unsigned int nFormatSize, PaDeviceIndex nDevice );


/** Returns device role (PaWasapiDeviceRole enum).

 @param nDevice device index.

 @return A non-negative value indicating device role or, a PaErrorCode (which are always negative)
         if PortAudio is not initialized or an error is encountered.
*/
int/*PaWasapiDeviceRole*/ PaWasapi_GetDeviceRole( PaDeviceIndex nDevice );


/** Boost thread priority of calling thread (MMCSS). Use it for Blocking Interface only for thread
    which makes calls to Pa_WriteStream/Pa_ReadStream.

 @param hTask a handle to pointer to priority task. Must be used with PaWasapi_RevertThreadPriority
              method to revert thread priority to initial state.

 @param nPriorityClass an 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 **hTask, PaWasapiThreadPriority nPriorityClass );


/** Boost thread priority of calling thread (MMCSS). Use it for Blocking Interface only for thread
    which makes calls to Pa_WriteStream/Pa_ReadStream.

 @param hTask Task handle obtained by PaWasapi_BoostThreadPriority method.
 @return Error code indicating success or failure.
 @see PaWasapi_BoostThreadPriority
*/
PaError PaWasapi_ThreadPriorityRevert( void *hTask );


/*
    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 is capable to provides glitch-free
        audio at 2ms latency in Exclusive mode. Lowest possible latency for this mode is 
        usually - 2ms for HD Audio class audio chips (including on-board audio, 2ms was achieved 
        on Realtek ALC888/S/T). For Shared mode latency can not go lower than 20ms.

        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 12-13ms. 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 Vista bug 
        does not exist in Windows 7 x64.
        Polling is setup by speciying 'paWinWasapiPolling' flag.
        Thread priority can be boosted by specifying 'paWinWasapiBlockingThreadPriorityPro' flag.

    Blocking Interface:

        Blocking interface is implemented but due to above described Poll-Driven method can not
        deliver low latency audio. Specifying too low latency in Shared mode will result in 
        distorted audio although Exclusive mode adds stability.

    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.

    Pa_OpenStream:

        To set desired Share Mode (Exclusive/Shared) you must supply
        PaWasapiStreamInfo with flags paWinWasapiExclusive set through member of 
        PaStreamParameters::hostApiSpecificStreamInfo structure.
*/

#ifdef __cplusplus
}
#endif /* __cplusplus */

#endif /* PA_WIN_WASAPI_H */