AU/AU_System.h

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/*
 * PROPRIETARY INFORMATION.  This software is proprietary to
 * Side Effects Software Inc., and is not to be reproduced,
 * transmitted, or disclosed in any way without written permission.
 *
 * Produced by:
 *      Rob Bairos,,
 *      Side Effects Software Inc
 *      477 Richmond Street West
 *      Toronto, Ontario
 *      Canada   M5V 3E7
 *      416-504-9876
 *
 * NAME:        AU_Device.h ( Audio Library, C++)
 *
 * COMMENTS:
 */

#ifndef __AU_System__
#define __AU_System__

#include "AU_API.h"
#include <UT/UT_SysClone.h>
#include <UT/UT_PtrArray.h>

#ifdef WIN32
#include <windows.h>
#if !defined(IA64) && !defined(AMD64)
#define DWORD_PTR       DWORD
#endif
#endif

class AU_API AU_System
{
public:
                         AU_System();
                        ~AU_System();

protected:
    void                 stopDevice(int now);
    int                  isOpen();
    void                 setClosed();
    int                  bytesPerSample();
    void                 setFormatInfo( int channels, int rate, int bps );

    static void          addOpenDevice(int handle, bool input);
    static void          removeOpenDevice(int handle, bool input);
    // Set to 1 for input devices, 0 for output devices.
    int                  myInput;

    // Set to 1 if all wave packets for a given device are cleared
    // out of the device queue.
    int                  myDone;
    
    // Number of bytes currently in the device waiting to be played,
    // or the number of bytes in the device queue waiting to be filled.
    int                  myCurrentQueueSize;

    // Buffer for incoming or outgoing samples.
    char                *myQueue;

    // Size of the above buffer in bytes.
    int                  myQueueSize;

    // The index in the above buffer where the next samples should be
    // written to or read from (expressed as a byte position).
    int                  myQueuePos;

    // Set to 1 if audio is supposed to be 4 channel. NT doesn't
    // support 4 channel audio natively, so we fake it.
    int                  my4Channel;
    
    // Handles multi-threaded access to our queue of wave packets.
    CRITICAL_SECTION     myCritSect;
    
    HANDLE               myHandle;
    WAVEFORMATEX         myFormat;

    // This must be public so we can get the address.
    static void CALLBACK callbackFunc( HWAVEOUT hwo, UINT uMsg, DWORD dwInst,
                                       DWORD_PTR dwParam1, DWORD dwParam2 );
private:

    static DWORD WINAPI  discardLoop( void *parm );
    
    static int                           theDiscardLoopStarted;
    static UT_PtrArray< WAVEHDR * >      theWaveHeaders;
    static CRITICAL_SECTION              theDiscardCritSect;
};

#endif // __AU_System

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