audiorecorderengine.cpp

《基于Symbian OS的手机开发与应用实践》这本书的配套源码。

/*
* ============================================================================
*  Name     : CAudioRecorderEngine from AudioRecorderEngine.cpp
*  Part of  : AudioRecorder
*  Created  : 31.01.2006 by ToBeReplacedByAuthor
*  Implementation notes:
*  
*  Version  :
*  Copyright: ToBeReplacedByCopyright
* ============================================================================
*/

// INCLUDE FILES
#include "AudioRecorderEngine.h"

// ================= MEMBER FUNCTIONS =======================

// Two-phased constructor.
CAudioRecorderEngine* CAudioRecorderEngine::NewL(MObserver& aObserver)
    {
    CAudioRecorderEngine* self = new (ELeave) CAudioRecorderEngine( aObserver );
    CleanupStack::PushL( self );
    self->ConstructL();
    CleanupStack::Pop();

    return self;
    }

// destructor
CAudioRecorderEngine::~CAudioRecorderEngine()
    {
    Stop();
    }

//
void CAudioRecorderEngine::MoscoStateChangeEvent(CBase*/* aObject*/, 
    TInt/* aPreviousState*/, TInt aCurrentState, TInt aError)
    {
    if(aError!=KErrNone)
        {
        iAudioRecorder->Stop();
        iAudioRecorder->Close();
        delete iAudioRecorder;
        iAudioRecorder = NULL;
        iObserver.OnComplete(aError);
        return;
        }
    switch(aCurrentState)
        {
        case CMdaAudioClipUtility::EOpen:
            {
            iAudioRecorder->SetAudioDeviceMode(CMdaAudioRecorderUtility::ELocal);
            iAudioRecorder->SetGain(iAudioRecorder->MaxGain());
            // record from the beginning of file
            iAudioRecorder->SetPosition(TTimeIntervalMicroSeconds(0));
            iAudioRecorder->CropL();
            iAudioRecorder->RecordL();
            break;
            }
        case CMdaAudioClipUtility::ERecording:
            {
            break;
            }
        default:
            {
            break;
            }
        }
    }

//
void CAudioRecorderEngine::RecordL(const TFileName& aFileName)
    {
    Stop();
    iAudioRecorder = CMdaAudioRecorderUtility::NewL(*this);

    iLocation.iName = aFileName;
    iCodec.iBits = TMdaPcmWavCodec::E16BitPcm;
    iSettings.iCaps = TMdaAudioDataSettings::ESampleRateFixed 
        | TMdaAudioDataSettings::ESampleRate8000Hz 
        | TMdaAudioDataSettings::EChannelsMono;
    iSettings.iSampleRate = 8000;
    iSettings.iChannels = 1;
    // Transfer ownership
    iAudioRecorder->OpenL(&iLocation, &iFormat, &iCodec, &iSettings);
    }

//
void CAudioRecorderEngine::Stop()
    {
    if (iAudioRecorder!=NULL)
        {
        iAudioRecorder->Stop();
        iAudioRecorder->Close();
        delete iAudioRecorder;
        iAudioRecorder = NULL;
        iObserver.OnComplete(KErrNone);
        }
    }

// constructor
CAudioRecorderEngine::CAudioRecorderEngine(MObserver& aObserver)
: iObserver(aObserver)
    {
    }

// EPOC default constructor can leave.
void CAudioRecorderEngine::ConstructL()
    {
    }

// End of File