videosettings.cpp Example File

  /****************************************************************************
  **
  ** Copyright (C) 2015 The Qt Company Ltd.
  ** Contact: http://www.qt.io/licensing/
  **
  ** This file is part of the examples of the Qt Toolkit.
  **
  ** $QT_BEGIN_LICENSE:BSD$
  ** 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 The Qt Company Ltd 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 "videosettings.h"
  #include "ui_videosettings.h"

  #include <QComboBox>
  #include <QDebug>
  #include <QMediaRecorder>
  #include <QMediaService>

  VideoSettings::VideoSettings(QMediaRecorder *mediaRecorder, QWidget *parent) :
      QDialog(parent),
      ui(new Ui::VideoSettingsUi),
      mediaRecorder(mediaRecorder)
  {
      ui->setupUi(this);

      //audio codecs
      ui->audioCodecBox->addItem(tr("Default audio codec"), QVariant(QString()));
      foreach (const QString &codecName, mediaRecorder->supportedAudioCodecs()) {
          QString description = mediaRecorder->audioCodecDescription(codecName);
          ui->audioCodecBox->addItem(codecName+": "+description, QVariant(codecName));
      }

      //sample rate:
      foreach (int sampleRate, mediaRecorder->supportedAudioSampleRates()) {
          ui->audioSampleRateBox->addItem(QString::number(sampleRate), QVariant(sampleRate));
      }

      ui->audioQualitySlider->setRange(0, int(QMultimedia::VeryHighQuality));

      //video codecs
      ui->videoCodecBox->addItem(tr("Default video codec"), QVariant(QString()));
      foreach (const QString &codecName, mediaRecorder->supportedVideoCodecs()) {
          QString description = mediaRecorder->videoCodecDescription(codecName);
          ui->videoCodecBox->addItem(codecName+": "+description, QVariant(codecName));
      }

      ui->videoQualitySlider->setRange(0, int(QMultimedia::VeryHighQuality));

      ui->videoResolutionBox->addItem(tr("Default"));
      QList<QSize> supportedResolutions = mediaRecorder->supportedResolutions();
      foreach (const QSize &resolution, supportedResolutions) {
          ui->videoResolutionBox->addItem(QString("%1x%2").arg(resolution.width()).arg(resolution.height()),
                                          QVariant(resolution));
      }

      ui->videoFramerateBox->addItem(tr("Default"));
      QList<qreal> supportedFrameRates = mediaRecorder->supportedFrameRates();
      qreal rate;
      foreach (rate, supportedFrameRates) {
          QString rateString = QString("%1").arg(rate, 0, 'f', 2);
          ui->videoFramerateBox->addItem(rateString, QVariant(rate));
      }

      //containers
      ui->containerFormatBox->addItem(tr("Default container"), QVariant(QString()));
      foreach (const QString &format, mediaRecorder->supportedContainers()) {
          ui->containerFormatBox->addItem(format+":"+mediaRecorder->containerDescription(format),
                                          QVariant(format));
      }
  }

  VideoSettings::~VideoSettings()
  {
      delete ui;
  }

  void VideoSettings::changeEvent(QEvent *e)
  {
      QDialog::changeEvent(e);
      switch (e->type()) {
      case QEvent::LanguageChange:
          ui->retranslateUi(this);
          break;
      default:
          break;
      }
  }

  QAudioEncoderSettings VideoSettings::audioSettings() const
  {
      QAudioEncoderSettings settings = mediaRecorder->audioSettings();
      settings.setCodec(boxValue(ui->audioCodecBox).toString());
      settings.setQuality(QMultimedia::EncodingQuality(ui->audioQualitySlider->value()));
      settings.setSampleRate(boxValue(ui->audioSampleRateBox).toInt());
      return settings;
  }

  void VideoSettings::setAudioSettings(const QAudioEncoderSettings &audioSettings)
  {
      selectComboBoxItem(ui->audioCodecBox, QVariant(audioSettings.codec()));
      selectComboBoxItem(ui->audioSampleRateBox, QVariant(audioSettings.sampleRate()));
      ui->audioQualitySlider->setValue(audioSettings.quality());
  }

  QVideoEncoderSettings VideoSettings::videoSettings() const
  {
      QVideoEncoderSettings settings = mediaRecorder->videoSettings();
      settings.setCodec(boxValue(ui->videoCodecBox).toString());
      settings.setQuality(QMultimedia::EncodingQuality(ui->videoQualitySlider->value()));
      settings.setResolution(boxValue(ui->videoResolutionBox).toSize());
      settings.setFrameRate(boxValue(ui->videoFramerateBox).value<qreal>());

      return settings;
  }

  void VideoSettings::setVideoSettings(const QVideoEncoderSettings &videoSettings)
  {
      selectComboBoxItem(ui->videoCodecBox, QVariant(videoSettings.codec()));
      selectComboBoxItem(ui->videoResolutionBox, QVariant(videoSettings.resolution()));
      ui->videoQualitySlider->setValue(videoSettings.quality());

      //special case for frame rate
      for (int i = 0; i < ui->videoFramerateBox->count(); ++i) {
          qreal itemRate = ui->videoFramerateBox->itemData(i).value<qreal>();
          if (qFuzzyCompare(itemRate, videoSettings.frameRate())) {
              ui->videoFramerateBox->setCurrentIndex(i);
              break;
          }
      }
  }

  QString VideoSettings::format() const
  {
      return boxValue(ui->containerFormatBox).toString();
  }

  void VideoSettings::setFormat(const QString &format)
  {
      selectComboBoxItem(ui->containerFormatBox, QVariant(format));
  }

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

      return box->itemData(idx);
  }

  void VideoSettings::selectComboBoxItem(QComboBox *box, const QVariant &value)
  {
      for (int i = 0; i < box->count(); ++i) {
          if (box->itemData(i) == value) {
              box->setCurrentIndex(i);
              break;
          }
      }
  }