Home · All Classes · All Functions ·

audiorecorder.cpp Example File
audiorecorder/audiorecorder.cpp

    /****************************************************************************
    **
    ** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
    ** All rights reserved.
    ** Contact: Nokia Corporation (qt-info@nokia.com)
    **
    ** This file is part of the Qt Mobility Components.
    **
    ** $QT_BEGIN_LICENSE:BSD$
    ** You may use this file under the terms of the BSD license as follows:
    **
    ** "Redistribution and use in source and binary forms, with or without
    ** modification, are permitted provided that the following conditions are
    ** met:
    **   * Redistributions of source code must retain the above copyright
    **     notice, this list of conditions and the following disclaimer.
    **   * Redistributions in binary form must reproduce the above copyright
    **     notice, this list of conditions and the following disclaimer in
    **     the documentation and/or other materials provided with the
    **     distribution.
    **   * Neither the name of Nokia Corporation and its Subsidiary(-ies) nor
    **     the names of its contributors may be used to endorse or promote
    **     products derived from this software without specific prior written
    **     permission.
    **
    ** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
    ** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
    ** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
    ** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
    ** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
    ** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
    ** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
    ** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
    ** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
    ** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
    ** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
    ** $QT_END_LICENSE$
    **
    ****************************************************************************/

    #include <QtCore/qdir.h>
    #include <QtGui/qfiledialog.h>

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

    #include "audiorecorder.h"

    #if defined(Q_WS_MAEMO_5) || defined(Q_WS_MAEMO_6)
    #include "ui_audiorecorder_small.h"
    #else
    #include "ui_audiorecorder.h"
    #endif

    AudioRecorder::AudioRecorder(QWidget *parent)
        :  QMainWindow(parent),
           ui(new Ui::AudioRecorder)
    {
        ui->setupUi(this);

        audiosource = new QAudioCaptureSource(this);
        capture = new QMediaRecorder(audiosource, this);

        //audio devices
        ui->audioDeviceBox->addItem(tr("Default"), QVariant(QString()));
        foreach(const QString &device, audiosource->audioInputs()) {
            ui->audioDeviceBox->addItem(device, QVariant(device));
        }

        //audio codecs
        ui->audioCodecBox->addItem(tr("Default"), QVariant(QString()));
        foreach(const QString &codecName, capture->supportedAudioCodecs()) {
            ui->audioCodecBox->addItem(codecName, QVariant(codecName));
        }

        //containers
        ui->containerBox->addItem(tr("Default"), QVariant(QString()));
        foreach(const QString &containerName, capture->supportedContainers()) {
            ui->containerBox->addItem(containerName, QVariant(containerName));
        }

        //sample rate:
        ui->sampleRateBox->addItem(tr("Default"), QVariant(0));
        foreach(int sampleRate, capture->supportedAudioSampleRates()) {
            ui->sampleRateBox->addItem(QString::number(sampleRate), QVariant(sampleRate));
        }

        ui->qualitySlider->setRange(0, int(QtMultimediaKit::VeryHighQuality));
        ui->qualitySlider->setValue(int(QtMultimediaKit::NormalQuality));

        //bitrates:
        ui->bitrateBox->addItem(QString("Default"), QVariant(0));
        ui->bitrateBox->addItem(QString("32000"), QVariant(32000));
        ui->bitrateBox->addItem(QString("64000"), QVariant(64000));
        ui->bitrateBox->addItem(QString("96000"), QVariant(96000));
        ui->bitrateBox->addItem(QString("128000"), QVariant(128000));

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

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

    void AudioRecorder::updateProgress(qint64 duration)
    {
        if (capture->error() != QMediaRecorder::NoError || duration < 2000)
            return;

        ui->statusbar->showMessage(tr("Recorded %1 sec").arg(qRound(duration/1000)));
    }

    void AudioRecorder::updateState(QMediaRecorder::State state)
    {
        QString statusMessage;

        switch(state) {
            case QMediaRecorder::RecordingState:
                ui->recordButton->setText(tr("Stop"));
                ui->pauseButton->setText(tr("Pause"));
                if (capture->outputLocation().isEmpty())
                    statusMessage = tr("Recording");
                else
                    statusMessage = tr("Recording to %1").arg(capture->outputLocation().toString());
                break;
            case QMediaRecorder::PausedState:
                ui->recordButton->setText(tr("Stop"));
                ui->pauseButton->setText(tr("Resume"));
                statusMessage = tr("Paused");
                break;
            case QMediaRecorder::StoppedState:
                ui->recordButton->setText(tr("Record"));
                ui->pauseButton->setText(tr("Pause"));
                statusMessage = tr("Stopped");
        }

        ui->pauseButton->setEnabled(state != QMediaRecorder::StoppedState);

        if (capture->error() == QMediaRecorder::NoError)
            ui->statusbar->showMessage(statusMessage);
    }

    static QVariant boxValue(const QComboBox *box)
    {
        int idx = box->currentIndex();
        if (idx == -1)
            return QVariant();

        return box->itemData(idx);
    }

    void AudioRecorder::toggleRecord()
    {
        if (capture->state() == QMediaRecorder::StoppedState) {
            audiosource->setAudioInput(boxValue(ui->audioDeviceBox).toString());

            QAudioEncoderSettings settings;
            settings.setCodec(boxValue(ui->audioCodecBox).toString());
            settings.setSampleRate(boxValue(ui->sampleRateBox).toInt());
            settings.setBitRate(boxValue(ui->bitrateBox).toInt());
            settings.setQuality(QtMultimediaKit::EncodingQuality(ui->qualitySlider->value()));
            settings.setEncodingMode(ui->constantQualityRadioButton->isChecked() ?
                                     QtMultimediaKit::ConstantQualityEncoding :
                                     QtMultimediaKit::ConstantBitRateEncoding);

            QString container = boxValue(ui->containerBox).toString();

            capture->setEncodingSettings(settings, QVideoEncoderSettings(), container);
            capture->record();
        } else {
            capture->stop();
        }
    }

    void AudioRecorder::togglePause()
    {
        if (capture->state() != QMediaRecorder::PausedState)
            capture->pause();
        else
            capture->record();
    }

    void AudioRecorder::setOutputLocation()
    {
        QString fileName = QFileDialog::getSaveFileName();

        capture->setOutputLocation(QUrl(fileName));
    }

    void AudioRecorder::displayErrorMessage()
    {
        ui->statusbar->showMessage(capture->errorString());
    }


Copyright © 2010 Nokia Corporation and/or its subsidiary(-ies) Trademarks
Qt Mobility Project 1.0.2