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commit 18b4338361
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--- a/project/fm_viewer/fav/VideoFrameExtractor.h
+++ b/project/fm_viewer/fav/VideoFrameExtractor.h
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+/******************************************************************************
+    QtAV:  Multimedia framework based on Qt and FFmpeg
+    Copyright (C) 2012-2016 Wang Bin <wbsecg1@gmail.com>
+
+*   This file is part of QtAV (from 2014)
+
+    This library is free software; you can redistribute it and/or
+    modify it under the terms of the GNU Lesser General Public
+    License as published by the Free Software Foundation; either
+    version 2.1 of the License, or (at your option) any later version.
+
+    This library is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+    Lesser General Public License for more details.
+
+    You should have received a copy of the GNU Lesser General Public
+    License along with this library; if not, write to the Free Software
+    Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+******************************************************************************/
+
+#ifndef QTAV_VIDEOFRAMEEXTRACTOR_H
+#define QTAV_VIDEOFRAMEEXTRACTOR_H
+
+#include <QtCore/QObject>
+#include "VideoFrame.h"
+
+//TODO: extract all streams
+namespace FAV {
+class VideoFrameExtractorPrivate;
+class Q_AV_EXPORT VideoFrameExtractor : public QObject
+{
+    Q_OBJECT
+    DPTR_DECLARE_PRIVATE(VideoFrameExtractor)
+    Q_PROPERTY(QString source READ source WRITE setSource NOTIFY sourceChanged)
+    Q_PROPERTY(bool autoExtract READ autoExtract WRITE setAutoExtract NOTIFY autoExtractChanged)
+    Q_PROPERTY(bool async READ async WRITE setAsync NOTIFY asyncChanged)
+    Q_PROPERTY(int precision READ precision WRITE setPrecision NOTIFY precisionChanged)
+    Q_PROPERTY(qint64 position READ position WRITE setPosition NOTIFY positionChanged)
+public:
+    explicit VideoFrameExtractor(QObject *parent = 0);
+    /*!
+     * \brief setSource
+     * Set the video file. If video changes, current loaded video will be unloaded.
+     */
+    void setSource(const QString url);
+    QString source() const;
+    /*!
+     * \brief setAsync
+     * Extract video frames in another thread. Default is true.
+     * In async mode, if current extraction is not finished, new
+     * setPosition() will be ignored.
+     */
+    void setAsync(bool value);
+    bool async() const;
+    void setAutoExtract(bool value);
+    bool autoExtract() const;
+    /*!
+     * \brief setPrecision
+     * if the difference between the next requested position is less than the value, previous
+     * one is used and no positionChanged() and frameExtracted() signals to emit.
+     * \param value < 0: auto. Real value depends on video duration and fps, but always 20 <= value <=500
+     * Default is auto.
+     */
+    void setPrecision(int value);
+    int precision() const;
+    void setPosition(qint64 value);
+    qint64 position() const;
+
+    virtual bool event(QEvent *e);
+Q_SIGNALS:
+    void frameExtracted(const FAV::VideoFrame& frame); // parameter: VideoFrame, bool changed?
+    void sourceChanged();
+    void asyncChanged();
+    void error(); // clear preview image in a slot
+    void autoExtractChanged();
+    /*!
+     * \brief positionChanged
+     * If not autoExtract, positionChanged() => extract() in a slot
+     */
+    void positionChanged();
+    void precisionChanged();
+
+    void aboutToExtract(qint64 pos);
+
+public Q_SLOTS:
+    /*!
+     * \brief extract
+     * If last extracted frame can be use, use it.
+     * If there is a key frame in [position, position+precision], the nearest key frame
+     * before position+precision will be extracted. Otherwise, the given position frame will be extracted.
+     */
+    void extract();
+private Q_SLOTS:
+    void extractInternal(qint64 pos);
+
+protected:
+    //VideoFrameExtractor(VideoFrameExtractorPrivate &d, QObject* parent = 0);
+    DPTR_DECLARE(VideoFrameExtractor)
+};
+
+} //namespace FAV
+#endif // QTAV_VIDEOFRAMEEXTRACTOR_H