histogramwidget.h Example File

/****************************************************************************
**
** Copyright (C) 2017 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the examples of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:BSD$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see https://www.qt.io/terms-conditions. For further
** information use the contact form at https://www.qt.io/contact-us.
**
** BSD License Usage
** Alternatively, 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."
**
** $QT_END_LICENSE$
**
****************************************************************************/

#ifndef HISTOGRAMWIDGET_H
#define HISTOGRAMWIDGET_H

#include <QThread>
#include <QVideoFrame>
#include <QAudioBuffer>
#include <QWidget>

class QAudioLevel;

class FrameProcessor: public QObject
{
    Q_OBJECT

public slots:
    void processFrame(QVideoFrame frame, int levels);

signals:
    void histogramReady(const QVector<qreal> &histogram);
};

class HistogramWidget : public QWidget
{
    Q_OBJECT

public:
    explicit HistogramWidget(QWidget *parent = nullptr);
    ~HistogramWidget();
    void setLevels(int levels) { m_levels = levels; }

public slots:
    void processFrame(const QVideoFrame &frame);
    void processBuffer(const QAudioBuffer &buffer);
    void setHistogram(const QVector<qreal> &histogram);

protected:
    void paintEvent(QPaintEvent *event) override;

private:
    QVector<qreal> m_histogram;
    int m_levels = 128;
    FrameProcessor m_processor;
    QThread m_processorThread;
    bool m_isBusy = false;
    QVector<QAudioLevel *> m_audioLevels;
};

#endif // HISTOGRAMWIDGET_H