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audiorecorder.cpp Example File
audiorecorder/audiorecorder.cpp

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    #include <QtGui>

    #include <qaudiocapturesource.h>
    #include <qmediarecorder.h>
    #include <qmediaservice.h>

    #include <QtMultimedia/qaudioformat.h>

    #include "audiorecorder.h"

    AudioRecorder::AudioRecorder()
    {
        audiosource = new QAudioCaptureSource;
        capture = new QMediaRecorder(audiosource);

        QAudioEncoderSettings audioSettings;
        audioSettings.setQuality(QtMedia::LowQuality);
        audioSettings.setEncodingMode(QtMedia::ConstantQualityEncoding);
        audioSettings.setCodec(capture->supportedAudioCodecs().first());
        capture->setEncodingSettings(audioSettings,QVideoEncoderSettings(),capture->supportedContainers().first());

        // set a default file
    #ifdef Q_OS_SYMBIAN
        capture->setOutputLocation(QUrl("c:\\data\\test.wav"));
    #else
        capture->setOutputLocation(QUrl("test.raw"));
    #endif

        QWidget *window = new QWidget;
        QGridLayout* layout = new QGridLayout;

        QLabel* deviceLabel = new QLabel;
        deviceLabel->setText("Devices");
        deviceBox = new QComboBox(this);
        deviceBox->setSizePolicy(QSizePolicy::Expanding,QSizePolicy::Fixed);

        QLabel* containerLabel = new QLabel;
        containerLabel->setText("Container");
        containersBox = new QComboBox(this);
        containersBox->setSizePolicy(QSizePolicy::Expanding,QSizePolicy::Fixed);

        QLabel* codecLabel = new QLabel;
        codecLabel->setText("Codec");
        codecsBox = new QComboBox(this);
        codecsBox->setSizePolicy(QSizePolicy::Expanding,QSizePolicy::Fixed);

        QLabel* qualityLabel = new QLabel;
        qualityLabel->setText("Quality");
        qualityBox = new QComboBox(this);
        qualityBox->setSizePolicy(QSizePolicy::Expanding,QSizePolicy::Fixed);

        QList<QString> inputs = audiosource->audioInputs();
        for(int i = 0; i < inputs.size(); i++)
            deviceBox->addItem(inputs.at(i));

        QStringList codecs = capture->supportedAudioCodecs();
        for(int i = 0; i < codecs.count(); i++)
            codecsBox->addItem(codecs.at(i));

        QStringList containers = capture->supportedContainers();
        for(int i = 0; i < containers.count(); i++)
            containersBox->addItem(containers.at(i));

        qualityBox->addItem("Low");
        qualityBox->addItem("Medium");
        qualityBox->addItem("High");

        connect(capture, SIGNAL(durationChanged(qint64)), this, SLOT(updateProgress(qint64)));
        connect(capture, SIGNAL(stateChanged(QMediaRecorder::State)), this, SLOT(stateChanged(QMediaRecorder::State)));

        layout->addWidget(deviceLabel,0,0,Qt::AlignHCenter);
        connect(deviceBox,SIGNAL(activated(int)),SLOT(deviceChanged(int)));
        layout->addWidget(deviceBox,0,1,1,3,Qt::AlignLeft);

        layout->addWidget(containerLabel,1,0,Qt::AlignHCenter);
        connect(containersBox,SIGNAL(activated(int)),SLOT(containerChanged(int)));
        layout->addWidget(containersBox,1,1,Qt::AlignLeft);

        layout->addWidget(codecLabel,1,2,Qt::AlignHCenter);
        connect(codecsBox,SIGNAL(activated(int)),SLOT(codecChanged(int)));
        layout->addWidget(codecsBox,1,3,Qt::AlignLeft);

        layout->addWidget(qualityLabel,2,0,Qt::AlignHCenter);
        connect(qualityBox,SIGNAL(activated(int)),SLOT(qualityChanged(int)));
        layout->addWidget(qualityBox,2,1,Qt::AlignLeft);

        fileButton = new QPushButton(this);
        fileButton->setText(tr("Output File"));
        connect(fileButton,SIGNAL(clicked()),SLOT(selectOutputFile()));
        layout->addWidget(fileButton,3,0,Qt::AlignHCenter);

        button = new QPushButton(this);
        button->setText(tr("Record"));
        connect(button,SIGNAL(clicked()),SLOT(toggleRecord()));
        layout->addWidget(button,3,1,Qt::AlignHCenter);

        recTime = new QLabel;
        recTime->setText("0 sec");
        layout->addWidget(recTime,4,0,Qt::AlignHCenter);

        window->setLayout(layout);
        setCentralWidget(window);
        window->show();

        active = false;
    }

    AudioRecorder::~AudioRecorder()
    {
        delete capture;
        delete audiosource;
    }

    void AudioRecorder::updateProgress(qint64 pos)
    {
        currentTime = pos;
        if(currentTime == 0) currentTime = 1;
        QString text = QString("%1 secs").arg(currentTime/1000);
        recTime->setText(text);
    }

    void AudioRecorder::stateChanged(QMediaRecorder::State state)
    {
        Q_UNUSED(state)
    }

    void AudioRecorder::deviceChanged(int idx)
    {
        audiosource->setAudioInput(deviceBox->itemText(idx));
    }

    void AudioRecorder::containerChanged(int idx)
    {
        QAudioEncoderSettings settings = capture->audioSettings();
        capture->setEncodingSettings(capture->audioSettings(), QVideoEncoderSettings(), containersBox->itemText(idx));
    }

    void AudioRecorder::codecChanged(int idx)
    {
        QAudioEncoderSettings settings = capture->audioSettings();
        settings.setCodec(codecsBox->itemText(idx));
        capture->setEncodingSettings(settings);
    }

    void AudioRecorder::qualityChanged(int idx)
    {
        QAudioEncoderSettings settings = capture->audioSettings();
        if(qualityBox->itemText(idx).compare("Low") == 0) {
            settings.setQuality(QtMedia::LowQuality);
        } else if(qualityBox->itemText(idx).compare("Medium") == 0) {
            settings.setQuality(QtMedia::NormalQuality);
        } else if(qualityBox->itemText(idx).compare("High") == 0) {
            settings.setQuality(QtMedia::HighQuality);
        }
        capture->setEncodingSettings(settings);
    }

    void AudioRecorder::toggleRecord()
    {
        if(!active) {
            recTime->setText("0 sec");
            currentTime = 0;
            capture->record();

            button->setText(tr("Stop"));
            active = true;
        } else {
            capture->stop();
            button->setText(tr("Record"));
            active = false;
        }
    }

    void AudioRecorder::selectOutputFile()
    {
        QStringList fileNames;

        QFileDialog dialog(this);

        dialog.setFileMode(QFileDialog::AnyFile);
        if (dialog.exec())
            fileNames = dialog.selectedFiles();

        if(fileNames.size() > 0)
            capture->setOutputLocation(QUrl(fileNames.first()));
    }


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Qt Mobility Project 1.0.0