mediarecorder.cpp

改写的qtopia录音放音程序

	     this, SLOT( processAudioData() ) );

    // Create the sample buffer, for recording the data temporarily.
#ifdef RECORD_THEN_SAVE
    if ( samples )
	delete samples;
    samples = new SampleBuffer( audioInput->bufferSize() );
#else
    if ( sampleBuffer )
	delete[] sampleBuffer;
    sampleBuffer = new short [ audioInput->bufferSize() ];
#endif

    // Start the save process.
    startSave();

    // Create the waveform display.
    contents->waveform->changeSettings( audioInput->frequency(),
					audioInput->channels() );

    configureAction->setEnabled( FALSE );
    contents->qualityCombo->setEnabled( FALSE );
    contents->storageLocation->setEnabled( FALSE );
    recordTime = 0;
    contents->progress->setTotalSteps( 120 );
    contents->progress->setProgress( 0 );
    contents->progress->setRecording();
    recording = TRUE;
    contents->recordButton->setText( tr("Stop") );
    contents->recordButton->setEnabled( TRUE );
    contents->choosefileButton->setEnabled( FALSE );
    contents->replayButton->setEnabled( FALSE );
    contents->deleteButton->setEnabled( FALSE );

    // Turn on the recording light.
    setRecordLight( TRUE );

    // Some audio devices may start sending us data immediately, but
    // others may need an initial "read" to start the ball rolling.
    // Processing at least one data block will prime the device.
    audioInput->start();
    processAudioData();
}


void MediaRecorder::stopRecording()
{
    audioInput->stop();
    contents->waveform->reset();
    configureAction->setEnabled( TRUE );
    contents->qualityCombo->setEnabled( TRUE );
    contents->storageLocation->setEnabled( TRUE );
    contents->recordButton->setEnabled( FALSE );
    recording = FALSE;
    contents->recordButton->setText( tr("Record") );
    contents->choosefileButton->setEnabled( TRUE );
    contents->replayButton->setEnabled( TRUE );
    contents->deleteButton->setEnabled( TRUE );

    // Turn off the recording light.
    setRecordLight( FALSE );

    // Terminate the data save.
    endSave();

    // Re-enable power save.
#ifdef Q_WS_QWS
    QPEApplication::setTempScreenSaverMode( QPEApplication::Enable );
#endif
}

void MediaRecorder::recordClicked()
{
    if ( recording ) {
	stopRecording();
    } else {
	startRecording();
    }
}


void MediaRecorder::startPlaying()
{
    // Do we have a decoder for this type of file?
    QString s=findplayfile->getfile();
//    QString name =s.left(s.length()-4);                                                                      
//    DocLnk doc;
//    encoder = recorderPlugins->fromType
//        ( qualities[config->currentQuality()].mimeType,
//          qualities[config->currentQuality()].formatTag );	
//    doc.setName( name );
//    doc.setType( encoder->pluginMimeType() );
//    doc.setLocation( contents->storageLocation->documentPath() );
//    playFile = doc.file();
//    playFileLink = doc.linkFile();
//    playFile=playFile.left(playFile.length()-8)+playFile.right(4);
    chooseFile="/root/Documents//audio/x-wav/"+s;
    
    decoder = playerPlugins->fromFile( chooseFile );
    if ( decoder == 0 || !( decoder->open( chooseFile ) ) ) {
        QMessageBox::critical( this, tr( "No playback plugin found" ),
			       tr( "Voice Recorder was unable to\n"
			           "locate a suitable plugin to\n"
			           "play the selected format." ) );
	return;
    }

    // Reconfigure the UI to reflect the current mode.
    configureAction->setEnabled( FALSE );
    contents->qualityCombo->setEnabled( FALSE );
    contents->storageLocation->setEnabled( FALSE );
    recordTime = 0;
    samplesPlayed = 0;
    long samples = decoder->audioSamples( 0 );
    long freq = decoder->audioFrequency( 0 );
    samples = (samples + freq - 1) / freq;
    contents->progress->setTotalSteps( samples );
    contents->progress->setProgress( 0 );
    contents->progress->setPlaying();
    playing = TRUE;
    contents->recordButton->setEnabled( FALSE );
    contents->replayButton->setText( tr("Stop") );
    contents->replayButton->setEnabled( TRUE );
    contents->deleteButton->setEnabled( TRUE );

    // Create the waveform display.
    contents->waveform->changeSettings( decoder->audioFrequency( 0 ),
					decoder->audioChannels( 0 ) );

    // Open the audio output device.
    audioOutput = new AudioDevice( decoder->audioFrequency( 0 ),
				   decoder->audioChannels( 0 ), 2 );
    sampleBuffer = new short [ audioOutput->bufferSize() ];
    QObject::connect( audioOutput, SIGNAL(completedIO()),
		      this, SLOT(audioOutputDone()) );

    // Force the first block to be played, to prime the device.
    audioOutputDone();
}


void MediaRecorder::stopPlaying()
{
    // Stop playing back the recorded sound
    if ( audioOutput ) {
	delete audioOutput;
	audioOutput = 0;
    }
    if ( decoder ) {
	decoder->close();
	decoder = 0;
    }
    if ( sampleBuffer ) {
	delete[] sampleBuffer;
	sampleBuffer = 0;
    }

    // Return the UI to the default state.
    contents->waveform->reset();
    configureAction->setEnabled( TRUE );
    contents->qualityCombo->setEnabled( TRUE );
    contents->storageLocation->setEnabled( TRUE );
    contents->recordButton->setEnabled( TRUE );
    playing = FALSE;
//    contents->choosefileButton->setEnabled( TRUE );
    contents->replayButton->setEnabled( TRUE );
    contents->replayButton->setText( tr("Play") );
    contents->deleteButton->setEnabled( TRUE );
    contents->progress->setProgress( 0 );
}

void MediaRecorder::choosefileClicked() 
{
	findplayfile =new Findplayfile(this);
  	findplayfile->exec();
//	playFile=s.left(s.length()-4);
 	contents->replayButton->setEnabled( TRUE );
	contents->deleteButton->setEnabled( TRUE );
}

void MediaRecorder::replayClicked()
{
    if ( playing ) {
	stopPlaying();
    } else {
	startPlaying();
    }
}


void MediaRecorder::deleteClicked()
{
    QString s=findplayfile->getfile();
    chooseFile="/root/Documents//audio/x-wav/"+s;

    if ( playing ) {
	stopPlaying();
    }
//    DocLnk doc( lastSaved );
//    doc.setLinkFile( lastSavedLink );
    DocLnk doc( chooseFile );
    chooseFileLink="/root/Documents//audio/x-wav/"+s.left(s.length()-4)+".desktop";
    doc.setLinkFile( chooseFileLink );
    doc.removeFiles();
    contents->replayButton->setEnabled( FALSE );
    contents->deleteButton->setEnabled( FALSE );
}


void MediaRecorder::clearData()
{
#ifdef RECORD_THEN_SAVE
    samples->clear();
#endif
    contents->waveform->reset();
    configureAction->setEnabled( TRUE );
    contents->recordButton->setEnabled( TRUE );
    recordTime = 0;
    contents->progress->setTotalSteps( 120 );
    contents->progress->setProgress( 0 );
}


void MediaRecorder::processAudioData()
{
    int result;
    long newTime;
    bool stopped = FALSE;

#ifdef RECORD_THEN_SAVE
    short *buf;
    unsigned int length;

    if ( samples->nextWriteBuffer( buf, length ) ) {
	// Read the next block of samples into the write buffer.
	result = audioInput->read( buf, length );
	samples->commitWriteBuffer( (unsigned int)result );

	// Update the waveform display.
	contents->waveform->newSamples( buf, result );
    } else {
	// The sample buffer is out of space, so stop recording.
	stopRecording();
	stopped = TRUE;
    }
#else
    result = audioInput->read( sampleBuffer, audioInput->bufferSize() );
    while ( result > 0 ) {
	contents->waveform->newSamples( sampleBuffer, result );
	encoder->writeAudioSamples( sampleBuffer, (long)result );
	result = audioInput->read( sampleBuffer, audioInput->bufferSize() );
    }
#endif

    // Update the record time if another second has elapsed.
    newTime = audioInput->position() / (long)(audioInput->frequency());
    if ( newTime != recordTime ) {
	recordTime = newTime;
	if ( recordTime >= contents->progress->totalSteps() ) {
	    // Change the resolution on the progress bar as we've
	    // max'ed out the current limit.
	    contents->progress->setTotalSteps
		(contents->progress->totalSteps() * 4);
	}
	contents->progress->setProgress( (int)recordTime );
    }

    // Stop recording if we have hit the maximum record time.
    if ( recordTime >= maxRecordTime && !stopped ) {
	stopRecording();
    }
}


void MediaRecorder::configure()
{
    config->processPopup();
    contents->qualityCombo->setCurrentItem( config->currentQuality() );
    qualityChanged( config->currentQuality() );
}


void MediaRecorder::noPluginError()
{
    QMessageBox::critical( this, tr( "No plugin found" ),
			   tr( "Voice Recorder was unable to\n"
			       "locate a suitable plugin to\n"
			       "record in the selected format." ) );
}


#define	RECORD_LIGHT_ID	    ((int)0x56526563)	// "VRec"

void MediaRecorder::setRecordLight( bool enable )
{
    if ( enable ) {
        QCopEnvelope( "Qt/Tray", "setIcon(int,QPixmap)" )
		<< RECORD_LIGHT_ID
		<< Resource::loadPixmap( "record-light" );
	recordLightState = TRUE;
	lightTimer->start( 500 );
    } else {
        QCopEnvelope( "Qt/Tray", "remove(int)" )
		<< RECORD_LIGHT_ID;
	recordLightState = FALSE;
	lightTimer->stop();
    }
}


void MediaRecorder::recordLightBlink()
{
    recordLightState = !recordLightState;
    if ( recordLightState ) {
        QCopEnvelope( "Qt/Tray", "setIcon(int,QPixmap)" )
		<< RECORD_LIGHT_ID
		<< Resource::loadPixmap( "record-light" );
    } else {
        QCopEnvelope( "Qt/Tray", "setIcon(int,QPixmap)" )
		<< RECORD_LIGHT_ID
		<< Resource::loadPixmap( "record-blank" );
    }
}


void MediaRecorder::closeEvent( QCloseEvent *e )
{
    // Shut down recording or playback.
    if ( recording ) {
	stopRecording();
    } else if ( playing ) {
	stopPlaying();
    }

    // Disable the "Play" and "Delete" buttons so that if we
    // are restarted in "fast load" mode, we will return to
    // the initial "nothing is recorded" state in the UI.
    contents->replayButton->setEnabled( FALSE );
    contents->deleteButton->setEnabled( FALSE );

    e->accept();
}


void MediaRecorder::audioOutputDone()
{
    // Read the next block of samples.
    long samplesRead = 0;
    if ( !decoder->audioReadSamples( sampleBuffer, 2, 1024, samplesRead, 0 ) ) {
	stopPlaying();
	return;
    }
    if ( samplesRead <= 0 ) {
	stopPlaying();
	return;
    }

    // Write the samples to the audio output device.
    audioOutput->write( (char *)sampleBuffer, (int)( samplesRead * 4 ) );

    // Update the waveform display.
    contents->waveform->newSamples( sampleBuffer, samplesRead );

    // Update the playback time if another second has elapsed.
    samplesPlayed += samplesRead;
    long newTime = samplesPlayed / (long)(decoder->audioFrequency( 0 ));
    if ( newTime != recordTime ) {
	recordTime = newTime;
	if ( recordTime > contents->progress->totalSteps() ) {
	    recordTime = contents->progress->totalSteps();
	}
	contents->progress->setProgress( (int)recordTime );
    }
}


void MediaRecorder::traySocket( const QCString& msg, const QByteArray &data )
{
    QDataStream stream( data, IO_ReadOnly );
    int id = 0;
    QPoint p;
    
    if ( msg == "popup(int,QPoint)" ) {
	stream >> id >> p;
    } else if ( msg == "clicked(int,QPoint)" || msg == "doubleClicked(int,QPoint)" ) {
	stream >> id >> p;
    }

    if ( id == RECORD_LIGHT_ID ) {
	if ( this->isVisible() )
	    this->raise();
	else
	    this->showMaximized();
    }
}