DXFullDuplex.hxx

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/*
 * Copyright (c) 2001-2004 MUSIC TECHNOLOGY GROUP (MTG)
 *                         UNIVERSITAT POMPEU FABRA
 *
 *
 * This program 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 2 of the License, or
 * (at your option) any later version.
 *
 * This program 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 this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 */

#ifndef __DXFULLDUPLEX__
#define __DXFULLDUPLEX__

#include <dsound.h>
#include <dxerr8.h>
#include "Err.hxx"
#include "DataTypes.hxx"
#include "Assert.hxx"

namespace CLAM
{

class ErrDXFullDuplex : public Err
{
public:
        const char* mTxt;
        HRESULT mHR;
        ErrDXFullDuplex(const char* txt,HRESULT hr)
                : Err(), mTxt(txt),mHR(hr)
        {
                const char* dxErrStr = DXGetErrorString8(hr);
                mMsg = (char*) malloc(strlen(txt)+strlen(dxErrStr)+1);
                strcpy(mMsg,txt);
                strcat(mMsg,dxErrStr);
        }
};

// Helper template functions for safe pointer releasing and deleting

template < typename PointerType >
bool SafeDelete( PointerType& ptr )
{
        if ( ptr ) // ptr is not null
                {
                        delete ptr;
                        ptr = NULL;
                }
        else
                return false;

        return true;
}

template < typename DXObjectType >
bool SafeRelease( DXObjectType& obj )
{
        if ( obj ) // Obj is not null
                {
                        obj->Release();
                        obj = NULL;
                }
        else
                return false;

        return true;
}

class DXFullDuplex
{
public:

        // Handle to a Window's window. This allows us to claim some
        // OS resources ( such as access to audio devices ).
        static HWND       shMainWnd;

        DXFullDuplex( TUInt32 irate, TByte ichannels, TSize latency, LPGUID pGUID );
        ~DXFullDuplex();

        HRESULT        Start( void );
        HRESULT        Poll( void );
        HRESULT        Write( short* buf, TSize size );
        HRESULT        Read ( short* buf, TSize size );

private:
        
        HRESULT        RestoreBuffer( LPDIRECTSOUNDBUFFER pDSBuffer,
                                                                  bool&               wasRestored );

        virtual void   SetWaveFormat( WAVEFORMATEX* pwfx );

        HRESULT    InitDSoundDevices( void );

        HRESULT    CreateDXBuffers( void );

        void       CheckResult( const char* msg, HRESULT hr );

private:

        LPGUID                             mGUID;

        LPDIRECTSOUND                      mDS;          // The DirectSound Object pointer
        LPDIRECTSOUNDCAPTURE               mDSCapture;   // The DirectSoundCapture Object pointer
        LPDIRECTSOUNDBUFFER                mDSBPrimary;  // The Primary Sound Buffer
        LPDIRECTSOUNDBUFFER                mDSBOutput;   // The Output (Secondary) Sound Buffer
        LPDIRECTSOUNDCAPTUREBUFFER         mDSBCapture;  // The Input ( SoundCapture ) Device Buffer 
        LPDIRECTSOUNDNOTIFY                mDSNotify;    // The DirectSound Notify Object

        DWORD                              mOutputBufferSize;
        DWORD                              mCaptureBufferSize;
        DWORD                              mNextCaptureOffset;
    DWORD                              mNextOutputOffset;
    
        WAVEFORMATEX                       mCaptureWaveFormat;
        WAVEFORMATEX                       mOutputFormat;
        
        TUInt32                            mSampleRate;
        TByte                              mChannels;

        bool                               mWritingToPrimary;

public:
        DWORD                              mLatency;

};

}

#endif // DXFullDuplex.hxx

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