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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 <qaudioencodercontrol.h>

    #include <qaudioformat.h>

    #include "audiorecorder.h"

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

        // set a default file
    #ifdef Q_OS_SYMBIAN
        capture->setOutputLocation(recordPathAudio(QUrl()));
    #else
        capture->setOutputLocation(QUrl("test.raw"));
    #endif

        QWidget *window = new QWidget;
        window->setMinimumSize(320,240);
        window->setSizePolicy(QSizePolicy::Minimum,QSizePolicy::Minimum);

        QGridLayout* layout = new QGridLayout;

        QLabel* deviceLabel = new QLabel;
        deviceLabel->setText(tr("Audio Device"));
        deviceBox = new QComboBox(this);
        deviceBox->setSizePolicy(QSizePolicy::MinimumExpanding,QSizePolicy::Fixed);
        deviceBox->setMinimumSize(200,10);

        QLabel* encmodeLabel = new QLabel;
        encmodeLabel->setText(tr("Encode Mode"));
        encModeBox = new QComboBox(this);
        encModeBox->setSizePolicy(QSizePolicy::MinimumExpanding,QSizePolicy::Fixed);
        encModeBox->setMinimumSize(200,10);

        QLabel* containerLabel = new QLabel;
        containerLabel->setText(tr("File Container"));
        containersBox = new QComboBox(this);
        containersBox->setSizePolicy(QSizePolicy::MinimumExpanding,QSizePolicy::Fixed);
        containersBox->setMinimumSize(200,10);

        QLabel* codecLabel = new QLabel;
        codecLabel->setText(tr("Audio Codec"));
        codecsBox = new QComboBox(this);
        codecsBox->setSizePolicy(QSizePolicy::MinimumExpanding,QSizePolicy::Fixed);
        codecsBox->setMinimumSize(200,10);

        QLabel* sampleRateLabel = new QLabel;
        sampleRateLabel->setText(tr("Sample Rate"));
        sampleRateBox = new QComboBox(this);
        sampleRateBox->setSizePolicy(QSizePolicy::MinimumExpanding,QSizePolicy::Fixed);
        sampleRateBox->setMinimumSize(200,10);

        QLabel* channelLabel = new QLabel;
        channelLabel->setText(tr("Channel count"));
        channelBox = new QComboBox(this);
        channelBox->setSizePolicy(QSizePolicy::MinimumExpanding,QSizePolicy::Fixed);
        channelBox->setMinimumSize(200,10);

        QLabel* qualityLabel = new QLabel;
        qualityLabel->setText(tr("Audio Quality"));
        qualityBox = new QComboBox(this);
        qualityBox->setSizePolicy(QSizePolicy::MinimumExpanding,QSizePolicy::Fixed);
        qualityBox->setMinimumSize(200,10);

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

        QList<QString> encmodes;
        encmodes <<"ConstantQuality"<<"ConstantBitRate";
        for(int i = 0; i < encmodes.size(); i++)
            encModeBox->addItem(encmodes.at(i));

        QStringList codecs = capture->supportedAudioCodecs();
        if (codecs.count() == 2)
            swap(codecs[0], codecs[1]);
        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));

        QList<int> samplerates = capture->supportedAudioSampleRates();
        for(int i = 0; i < samplerates.count(); i++) {
            QString rateString = QString("%1").arg(samplerates.at(i));
            sampleRateBox->addItem(rateString, QVariant(samplerates.at(i)));
        }

        QList<int> channels;
        channels <<1<<2;
        for(int i = 0; i < channels.count(); i++) {
            QString channelString = QString("%1").arg(channels.at(i));
            channelBox->addItem(channelString, QVariant(channels.at(i)));
        }

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

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

        if (codecs.count() > 0) {
        QAudioEncoderSettings audioSettings;
        audioSettings.setQuality(QtMultimediaKit::LowQuality);
        audioSettings.setEncodingMode(QtMultimediaKit::ConstantQualityEncoding);
        audioSettings.setCodec(codecs.first());
        capture->setEncodingSettings(audioSettings,QVideoEncoderSettings(),
                containers.first());
        }

        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(encmodeLabel,1,0,Qt::AlignHCenter);
        connect(encModeBox,SIGNAL(activated(int)),SLOT(encmodeChanged(int)));
        layout->addWidget(encModeBox,1,1,1,3,Qt::AlignLeft);

        layout->addWidget(containerLabel,2,0,Qt::AlignHCenter);
        connect(containersBox,SIGNAL(activated(int)),SLOT(containerChanged(int)));
        layout->addWidget(containersBox,2,1,1,3,Qt::AlignLeft);

        layout->addWidget(codecLabel,3,0,Qt::AlignHCenter);
        connect(codecsBox,SIGNAL(activated(int)),SLOT(codecChanged(int)));
        layout->addWidget(codecsBox,3,1,1,3,Qt::AlignLeft);

        layout->addWidget(sampleRateLabel,4,0,Qt::AlignHCenter);
        connect(sampleRateBox,SIGNAL(activated(int)),SLOT(sampleRateChanged(int)));
        layout->addWidget(sampleRateBox,4,1,1,3,Qt::AlignLeft);

        layout->addWidget(channelLabel,5,0,Qt::AlignHCenter);
        connect(channelBox,SIGNAL(activated(int)),SLOT(channelCountChanged(int)));
        layout->addWidget(channelBox,5,1,1,3,Qt::AlignLeft);

        layout->addWidget(qualityLabel,6,0,Qt::AlignHCenter);
        connect(qualityBox,SIGNAL(activated(int)),SLOT(qualityChanged(int)));
        layout->addWidget(qualityBox,6,1,1,3,Qt::AlignLeft);

        fileButton = new QPushButton(this);
        fileButton->setText(tr("Output File"));
        connect(fileButton,SIGNAL(clicked()),SLOT(selectOutputFile()));
        layout->addWidget(fileButton,7,0,Qt::AlignHCenter);

        pauseButton = new QPushButton(this);
        pauseButton->setText(tr("Pause"));
        connect(pauseButton,SIGNAL(clicked()),SLOT(togglePause()));
        layout->addWidget(pauseButton,7,1,Qt::AlignHCenter);

        button = new QPushButton(this);
        button->setText(tr("Record"));
        connect(button,SIGNAL(clicked()),SLOT(toggleRecord()));
        layout->addWidget(button,7,2,Qt::AlignHCenter);

        statusLabel = new QLabel;
        statusLabel->setSizePolicy(QSizePolicy::MinimumExpanding,QSizePolicy::Fixed);
        statusLabel->setMinimumSize(130,10);
        statusLabel->setFrameStyle(QFrame::Panel | QFrame::Sunken);
        statusLabel->setLineWidth(1);
        layout->addWidget(statusLabel,8,0,Qt::AlignHCenter);

        QLabel* durationLabel = new QLabel;
        durationLabel->setText(tr("Duration"));
        layout->addWidget(durationLabel,8,1,Qt::AlignRight);

        recTime = new QLabel;
        layout->addWidget(recTime,8,2,Qt::AlignLeft);

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

        active = false;
        paused = false;
    }

    QUrl AudioRecorder::recordPathAudio(QUrl filePath)
    {
        if (!filePath.isEmpty())
            return filePath;

        QDir outputDir(QDir::rootPath());

        int lastImage = 0;
        int fileCount = 0;
        foreach(QString fileName, outputDir.entryList(QStringList() << "testclip_*")) {
            int imgNumber = fileName.mid(5, fileName.size()-9).toInt();
            lastImage = qMax(lastImage, imgNumber);
            if (outputDir.exists(fileName))
                fileCount+=1;
        }
        lastImage+=fileCount;
        QUrl location(QDir::toNativeSeparators(outputDir.canonicalPath()+QString("/testclip_%1").arg(lastImage+1,4,10,QLatin1Char('0'))));
        return location;
    }

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

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

    void AudioRecorder::stateChanged(QMediaRecorder::State state)
    {
        if (capture->error() != QMediaRecorder::NoError)
            return;

        switch(state) {
            case QMediaRecorder::RecordingState: {
                statusLabel->setText(tr("Recording"));
                button->setText(tr("Stop"));
                break;
            }
            case QMediaRecorder::PausedState: {
                statusLabel->setText(tr("Paused"));
                button->setText(tr("Record"));
                break;
            }
            default: {
                statusLabel->setText(tr("Stopped"));
                button->setText(tr("Record"));
            }
        }
    }

    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)
    {
        updateSamplerates(idx);
        updateChannelCount(idx);
        updateQuality(idx);
        QAudioEncoderSettings settings = capture->audioSettings();
        settings.setCodec(codecsBox->itemText(idx));
        capture->setEncodingSettings(settings);
    }

    void AudioRecorder::sampleRateChanged(int idx)
    {
        QAudioEncoderSettings settings = capture->audioSettings();
        settings.setSampleRate((sampleRateBox->itemData(idx).toInt()));
        capture->setEncodingSettings(settings);
    }

    void AudioRecorder::channelCountChanged(int idx)
    {
        QAudioEncoderSettings settings = capture->audioSettings();
        settings.setChannelCount((channelBox->itemData(idx).toInt()));
        capture->setEncodingSettings(settings);
    }

    void AudioRecorder::qualityChanged(int idx)
    {
        QAudioEncoderSettings settings = capture->audioSettings();

        switch(idx) {
        case 0:
            settings.setQuality(QtMultimediaKit::LowQuality);
            break;
        case 1:
            settings.setQuality(QtMultimediaKit::NormalQuality);
            break;
        default:
            settings.setQuality(QtMultimediaKit::HighQuality);
        }
        capture->setEncodingSettings(settings);
    }

    void AudioRecorder::encmodeChanged(int idx)
    {
        QAudioEncoderSettings settings = capture->audioSettings();

        switch(idx) {
        case 0:
            settings.setEncodingMode(QtMultimediaKit::ConstantQualityEncoding);
            break;
        case 1:
            settings.setEncodingMode(QtMultimediaKit::ConstantBitRateEncoding);
            break;
        default:
            settings.setEncodingMode(QtMultimediaKit::ConstantQualityEncoding);
        }
        capture->setEncodingSettings(settings);
    }

    void AudioRecorder::toggleRecord()
    {
        if(!active) {
            if(!paused) {
                recTime->setText("0");
                currentTime = 0;
            }
    #ifdef Q_OS_SYMBIAN
        if (!paused)
            capture->setOutputLocation(recordPathAudio(destination));
    #endif
            capture->record();
            active = true;
            paused = false;
        } else {
            capture->stop();
            active = false;
        }
    }

    void AudioRecorder::togglePause()
    {
        if(active && !paused) {
            capture->pause();
            active = false;
            paused = true;
        }
    }

    void AudioRecorder::selectOutputFile()
    {
        QStringList fileNames;

        QFileDialog dialog(this);

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

        if(fileNames.size() > 0)
    #ifdef Q_OS_SYMBIAN
            destination = QUrl(fileNames.first());
    #else
            capture->setOutputLocation(QUrl(fileNames.first()));

    #endif
    }

    void AudioRecorder::errorChanged(QMediaRecorder::Error err)
    {
        Q_UNUSED(err)

        statusLabel->setText(capture->errorString());
    }

    void AudioRecorder::updateSamplerates(int idx)
    {
        QAudioEncoderSettings settings;
        settings.setCodec(codecsBox->itemText(idx));

        QList<int> supportedSampleRates = capture->supportedAudioSampleRates(settings);
        sampleRateBox->clear();
        for(int i = 0; i < supportedSampleRates.count(); i++) {
            QString rateString = QString("%1").arg(supportedSampleRates.at(i));
            sampleRateBox->addItem(rateString, QVariant(supportedSampleRates.at(i)));
        }
    }

    void AudioRecorder::updateChannelCount(int idx)
    {
        QMediaControl *control = audiosource->service()->requestControl(QAudioEncoderControl_iid);
        if (!control)
            return;

        QAudioEncoderControl *audioEncoder = qobject_cast<QAudioEncoderControl*>(control);
        if (!audioEncoder) {
            audiosource->service()->releaseControl(control);
            return;
        }

        channelBox->clear();
        QStringList list = audioEncoder->supportedEncodingOptions(codecsBox->itemText(idx));
        QList<int> channels;
        if (list.contains("channels"))
            channels <<1<<2;
        else
            channels <<1;
        for(int i = 0; i < channels.count(); i++) {
            QString channelString = QString("%1").arg(channels.at(i));
            channelBox->addItem(channelString, QVariant(channels.at(i)));
        }
    }

    void AudioRecorder::updateQuality(int idx)
    {
        QMediaControl *control = audiosource->service()->requestControl(QAudioEncoderControl_iid);
        if (!control)
            return;

        QAudioEncoderControl *audioEncoder = qobject_cast<QAudioEncoderControl*>(control);
        if (!audioEncoder) {
            audiosource->service()->releaseControl(control);
            return;
        }

        qualityBox->clear();
        QStringList list = audioEncoder->supportedEncodingOptions(codecsBox->itemText(idx));
        QList<int> channels;
        if (list.contains("quality")) {
            qualityBox->addItem(tr("Low"));
            qualityBox->addItem(tr("Medium"));
            qualityBox->addItem(tr("High"));
        }else {
            qualityBox->addItem(tr("Low"));
        }
    }


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