pa_win_wmme.h

Go to the documentation of this file.

#ifndef PA_WIN_WMME_H
#define PA_WIN_WMME_H
/*
 * $Id$
 * PortAudio Portable Real-Time Audio Library
 * MME specific extensions
 *
 * Copyright (c) 1999-2000 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.
 */
 
#include "portaudio.h"
#include "pa_win_waveformat.h"
 
#ifdef __cplusplus
extern "C"
{
#endif /* __cplusplus */
 
 
/* The following are flags which can be set in
  PaWinMmeStreamInfo's flags field.
*/
 
#define paWinMmeUseLowLevelLatencyParameters            (0x01)
#define paWinMmeUseMultipleDevices                      (0x02)  /* use mme specific multiple device feature */
#define paWinMmeUseChannelMask                          (0x04)
 
/* By default, the mme implementation drops the processing thread's priority
    to THREAD_PRIORITY_NORMAL and sleeps the thread if the CPU load exceeds 100%
    This flag disables any priority throttling. The processing thread will always
    run at THREAD_PRIORITY_TIME_CRITICAL.
*/
#define paWinMmeDontThrottleOverloadedProcessingThread  (0x08)
 
/*  Flags for non-PCM spdif passthrough.
*/
#define paWinMmeWaveFormatDolbyAc3Spdif                 (0x10)
#define paWinMmeWaveFormatWmaSpdif                      (0x20)
 
 
typedef struct PaWinMmeDeviceAndChannelCount{
    PaDeviceIndex device;
    int channelCount;
}PaWinMmeDeviceAndChannelCount;
 
 
typedef struct PaWinMmeStreamInfo{
    unsigned long size;             
    PaHostApiTypeId hostApiType;    
    unsigned long version;          
    unsigned long flags;
 
    /* low-level latency setting support
        These settings control the number and size of host buffers in order
        to set latency. They will be used instead of the generic parameters
        to Pa_OpenStream() if flags contains the PaWinMmeUseLowLevelLatencyParameters
        flag.
 
        If PaWinMmeStreamInfo structures with PaWinMmeUseLowLevelLatencyParameters
        are supplied for both input and output in a full duplex stream, then the
        input and output framesPerBuffer must be the same, or the larger of the
        two must be a multiple of the smaller, otherwise a
        paIncompatibleHostApiSpecificStreamInfo error will be returned from
        Pa_OpenStream().
    */
    unsigned long framesPerBuffer;
    unsigned long bufferCount;  /* formerly numBuffers */
 
    /* multiple devices per direction support
        If flags contains the PaWinMmeUseMultipleDevices flag,
        this functionality will be used, otherwise the device parameter to
        Pa_OpenStream() will be used instead.
        If devices are specified here, the corresponding device parameter
        to Pa_OpenStream() should be set to paUseHostApiSpecificDeviceSpecification,
        otherwise an paInvalidDevice error will result.
        The total number of channels across all specified devices
        must agree with the corresponding channelCount parameter to
        Pa_OpenStream() otherwise a paInvalidChannelCount error will result.
    */
    PaWinMmeDeviceAndChannelCount *devices;
    unsigned long deviceCount;
 
    /*
        support for WAVEFORMATEXTENSIBLE channel masks. If flags contains
        paWinMmeUseChannelMask this allows you to specify which speakers
        to address in a multichannel stream. Constants for channelMask
        are specified in pa_win_waveformat.h
 
    */
    PaWinWaveFormatChannelMask channelMask;
 
}PaWinMmeStreamInfo;
 
 
int PaWinMME_GetStreamInputHandleCount( PaStream* stream );
 
 
HWAVEIN PaWinMME_GetStreamInputHandle( PaStream* stream, int handleIndex );
 
 
int PaWinMME_GetStreamOutputHandleCount( PaStream* stream );
 
 
HWAVEOUT PaWinMME_GetStreamOutputHandle( PaStream* stream, int handleIndex );
 
 
#ifdef __cplusplus
}
#endif /* __cplusplus */
 
#endif /* PA_WIN_WMME_H */