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--- a/project/fm_viewer/fav/Statistics.h
+++ b/project/fm_viewer/fav/Statistics.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 2013)
+
+    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_STATISTICS_H
+#define QTAV_STATISTICS_H
+
+#include "_fav_constants.h"
+#include <QtCore/QHash>
+#include <QtCore/QTime>
+#include <QtCore/QSharedData>
+
+/*!
+ * values from functions are dynamically calculated
+ */
+namespace FAV {
+
+class Q_AV_EXPORT Statistics
+{
+public:
+    Statistics();
+    ~Statistics();
+    void reset();
+
+    QString url;
+    int bit_rate;
+    QString format;
+    QTime start_time, duration;
+    QHash<QString, QString> metadata;
+    class Common {
+    public:
+        Common();
+        //TODO: dynamic bit rate compute
+        bool available;
+        QString codec, codec_long;
+        QString decoder;
+        QString decoder_detail;
+        QTime current_time, total_time, start_time;
+        int bit_rate;
+        qint64 frames;
+        qreal frame_rate; // average fps stored in media stream information
+        //union member with ctor, dtor, copy ctor only works in c++11
+        /*union {
+            audio_only audio;
+            video_only video;
+        } only;*/
+        QHash<QString, QString> metadata;
+    } audio, video; //init them
+
+    //from AVCodecContext
+    class Q_AV_EXPORT AudioOnly {
+    public:
+        AudioOnly();
+        int sample_rate; ///< samples per second
+        int channels;    ///< number of audio channels
+        QString channel_layout;
+        QString sample_fmt;  ///< sample format
+        /**
+         * Number of samples per channel in an audio frame.
+         * - decoding: may be set by some decoders to indicate constant frame size
+         */
+        int frame_size;
+        /**
+         * number of bytes per packet if constant and known or 0
+         * Used by some WAV based audio codecs.
+         */
+        int block_align;
+    } audio_only;
+    //from AVCodecContext
+    class Q_AV_EXPORT VideoOnly {
+    public:
+        //union member with ctor, dtor, copy ctor only works in c++11
+        VideoOnly();
+        VideoOnly(const VideoOnly&);
+        VideoOnly& operator =(const VideoOnly&);
+        ~VideoOnly();
+        // compute from pts history
+        qreal currentDisplayFPS() const;
+        qreal pts() const; // last pts
+
+        int width, height;
+        /**
+         * Bitstream width / height, may be different from width/height if lowres enabled.
+         * - decoding: Set by user before init if known. Codec should override / dynamically change if needed.
+         */
+        int coded_width, coded_height;
+        /**
+         * the number of pictures in a group of pictures, or 0 for intra_only
+         */
+        int gop_size;
+        QString pix_fmt;
+        /// return current absolute time (seconds since epcho
+        qint64 frameDisplayed(qreal pts); // used to compute currentDisplayFPS()
+    private:
+        class Private;
+        QExplicitlySharedDataPointer<Private> d;
+    } video_only;
+};
+
+} //namespace FAV
+
+#endif // QTAV_STATISTICS_H