reacdriver/REACAudioEngine.h at master · per-gron/reacdriver · GitHub

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/*
 *  REACAudioEngine.h
 *  REAC
 *
 *  Copyright 2011 Per Eckerdal. All rights reserved.
 *
 *
 *  This file is part of the OS X REAC driver.
 *
 *  The OS X REAC driver is free software: you can redistribute it
 *  and/or modify it under the terms of the GNU General Public License
 *  as published by the Free Software Foundation, either version 3 of
 *  the License, or (at your option) any later version.
 *
 *  The OS X REAC driver is distributed in the hope that it will be
 *  useful, but WITHOUT ANY WARRANTY; without even the implied warranty
 *  of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with OS X REAC driver.  If not, see
 *  <http://www.gnu.org/licenses/>.
 *
 */

#ifndef _REACAUDIOENGINE_H
#define _REACAUDIOENGINE_H

#include <IOKit/audio/IOAudioEngine.h>

#include "REACDevice.h"

#define REACAudioEngine                com_pereckerdal_driver_REACAudioEngine

class REACAudioEngine : public IOAudioEngine
{
    OSDeclareDefaultStructors(REACAudioEngine)

    // instance members
    REACConnection     *protocol;

    UInt32              mInBufferSize;
    void               *mInBuffer;
    UInt32              mOutBufferSize;
    void               *mOutBuffer;

    IOAudioStream      *outputStream;
    IOAudioStream      *inputStream;

    UInt32              mLastValidSampleFrame;

	SInt32              mVolume[17];
    SInt32              mMuteOut[17];
    SInt32              mMuteIn[17];
    SInt32              mGain[17];

    UInt32              blockSize;                // In sample frames -- fixed, as defined in the Info.plist (e.g. 8192)
    UInt32              numBlocks;
    UInt32              bufferOffsetFactor;
    UInt32              currentBlock;

    bool                duringHardwareInit;

    // For clipping routines
    UInt64              lastSampleTimeNS;


public:

	// class members
    static const SInt32 kVolumeMax;
    static const SInt32 kGainMax;

    virtual bool init(REACConnection* proto, OSDictionary *properties);
    virtual void free();

    virtual bool initHardware(IOService *provider);

    virtual bool createAudioStreams(IOAudioSampleRate *initialSampleRate);

    virtual IOReturn performAudioEngineStart();
    virtual IOReturn performAudioEngineStop();

    virtual UInt32 getCurrentSampleFrame();

    virtual IOReturn performFormatChange(IOAudioStream *audioStream, const IOAudioStreamFormat *newFormat,
                                         const IOAudioSampleRate *newSampleRate);

    virtual IOReturn clipOutputSamples(const void *mixBuf, void *sampleBuf, UInt32 firstSampleFrame,
                                       UInt32 numSampleFrames, const IOAudioStreamFormat *streamFormat,
                                       IOAudioStream *audioStream);
    virtual IOReturn convertInputSamples(const void *sampleBuf, void *destBuf, UInt32 firstSampleFrame,
                                         UInt32 numSampleFrames, const IOAudioStreamFormat *streamFormat,
                                         IOAudioStream *audioStream);

    void gotSamples(UInt8 **data, UInt32 *bufferSize);
    void getSamples(UInt8 **data, UInt32 *bufferSize);

protected:
    void incrementBlockCounter();

    virtual bool initControls();

    static  IOReturn volumeChangeHandler(IOService *target, IOAudioControl *volumeControl, SInt32 oldValue, SInt32 newValue);
    virtual IOReturn volumeChanged(IOAudioControl *volumeControl, SInt32 oldValue, SInt32 newValue);

    static  IOReturn outputMuteChangeHandler(IOService *target, IOAudioControl *muteControl, SInt32 oldValue, SInt32 newValue);
    virtual IOReturn outputMuteChanged(IOAudioControl *muteControl, SInt32 oldValue, SInt32 newValue);

    static  IOReturn gainChangeHandler(IOService *target, IOAudioControl *gainControl, SInt32 oldValue, SInt32 newValue);
    virtual IOReturn gainChanged(IOAudioControl *gainControl, SInt32 oldValue, SInt32 newValue);

    static  IOReturn inputMuteChangeHandler(IOService *target, IOAudioControl *muteControl, SInt32 oldValue, SInt32 newValue);
    virtual IOReturn inputMuteChanged(IOAudioControl *muteControl, SInt32 oldValue, SInt32 newValue);

};


#endif /* _REACAUDIOENGINE_H */