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project/fm_viewer/fav/Statistics.cpp

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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
+******************************************************************************/
+
+#include "Statistics.h"
+#include "ring.h"
+
+namespace FAV {
+
+Statistics::Common::Common():
+    available(false)
+  , bit_rate(0)
+  , frames(0)
+  , frame_rate(0)
+{
+}
+
+Statistics::AudioOnly::AudioOnly():
+    sample_rate(0)
+  , channels(0)
+  , frame_size(0)
+  , block_align(0)
+{
+}
+
+class Statistics::VideoOnly::Private : public QSharedData {
+public:
+    Private()
+        : pts(0)
+        , history(ring<qreal>(30))
+    {}
+    qreal pts;
+    ring<qreal> history;
+};
+
+Statistics::VideoOnly::VideoOnly():
+    width(0)
+  , height(0)
+  , coded_width(0)
+  , coded_height(0)
+  , gop_size(0)
+  , d(new Private())
+{
+}
+
+Statistics::VideoOnly::VideoOnly(const VideoOnly& v)
+  : width(v.width)
+  , height(v.height)
+  , coded_width(v.coded_width)
+  , coded_height(v.coded_height)
+  , gop_size(v.gop_size)
+  , d(v.d)
+{
+}
+
+Statistics::VideoOnly& Statistics::VideoOnly::operator =(const VideoOnly& v)
+{
+    width = v.width;
+    height = v.height;
+    coded_width = v.coded_width;
+    coded_height = v.coded_height;
+    gop_size = v.gop_size;
+    d = v.d;
+    return *this;
+}
+
+Statistics::VideoOnly::~VideoOnly()
+{
+}
+
+qreal Statistics::VideoOnly::pts() const
+{
+    return d->pts;
+}
+
+qint64 Statistics::VideoOnly::frameDisplayed(qreal pts)
+{
+    d->pts = pts;
+    const qint64 msecs = QDateTime::currentMSecsSinceEpoch();
+    const qreal t = (double)msecs/1000.0;
+    d->history.push_back(t);
+    return msecs;
+}
+// d->history is not thread safe!
+qreal Statistics::VideoOnly::currentDisplayFPS() const
+{
+    if (d->history.empty())
+        return 0;
+    // DO NOT use d->history.last-first
+    const qreal dt = (double)QDateTime::currentMSecsSinceEpoch()/1000.0 - d->history.front();
+    // dt should be always > 0 because history stores absolute time
+    if (qFuzzyIsNull(dt))
+        return 0;
+    return (qreal)d->history.size()/dt;
+}
+
+Statistics::Statistics()
+{
+}
+
+Statistics::~Statistics()
+{
+}
+
+void Statistics::reset()
+{
+    url = QString();
+    audio = Common();
+    video = Common();
+    audio_only = AudioOnly();
+    video_only = VideoOnly();
+    metadata.clear();
+}
+
+} //namespace FAV