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project/fm_viewer/fav/OutputSet.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 "OutputSet.h"
+#include "AVPlayer.h"
+#include "VideoRenderer.h"
+
+namespace FAV {
+
+OutputSet::OutputSet(AVPlayer *player):
+    QObject(player)
+  , mCanPauseThread(false)
+  , mpPlayer(player)
+  , mPauseCount(0)
+{
+}
+
+OutputSet::~OutputSet()
+{
+    mCond.wakeAll();
+    //delete? may be deleted by vo's parent
+    clearOutputs();
+}
+
+void OutputSet::lock()
+{
+    mMutex.lock();
+}
+
+void OutputSet::unlock()
+{
+    mMutex.unlock();
+}
+
+QList<AVOutput *> OutputSet::outputs()
+{
+    return mOutputs;
+}
+
+void OutputSet::sendVideoFrame(const VideoFrame &frame)
+{
+    if (mOutputs.isEmpty())
+        return;
+    VideoFrame f(frame);
+    foreach(AVOutput *output, mOutputs) {
+        if (!output->isAvailable())
+            continue;
+        VideoRenderer *vo = static_cast<VideoRenderer*>(output);
+        // TODO: sort vo by supported formats when a new vo is added to reduce convertion
+        if (!vo->isSupported(frame.pixelFormat()))
+            f = frame.to(vo->preferredPixelFormat());
+        vo->receive(f);
+    }
+}
+
+void OutputSet::clearOutputs()
+{
+    QMutexLocker lock(&mMutex);
+    Q_UNUSED(lock);
+    if (mOutputs.isEmpty())
+        return;
+    foreach(AVOutput *output, mOutputs) {
+        output->removeOutputSet(this);
+    }
+    mOutputs.clear();
+}
+
+void OutputSet::addOutput(AVOutput *output)
+{
+    QMutexLocker lock(&mMutex);
+    Q_UNUSED(lock);
+    mOutputs.append(output);
+    output->addOutputSet(this);
+}
+
+void OutputSet::removeOutput(AVOutput *output)
+{
+    QMutexLocker lock(&mMutex);
+    Q_UNUSED(lock);
+    mOutputs.removeAll(output);
+    output->removeOutputSet(this);
+}
+
+void OutputSet::notifyPauseChange(AVOutput *output)
+{
+    if (output->isPaused()) {
+        mPauseCount++;
+        if (mPauseCount == mOutputs.size()) {
+            mCanPauseThread = true;
+        }
+        //DO NOT pause here because it must be paused in AVThread
+    } else {
+        mPauseCount--;
+        mCanPauseThread = false;
+        if (mPauseCount == mOutputs.size() - 1) {
+            resumeThread();
+        }
+    }
+}
+
+bool OutputSet::canPauseThread() const
+{
+    return mCanPauseThread;
+}
+
+bool OutputSet::pauseThread(unsigned long timeout)
+{
+    QMutexLocker lock(&mMutex);
+    Q_UNUSED(lock);
+    return mCond.wait(&mMutex, timeout);
+}
+
+void OutputSet::resumeThread()
+{
+    mCond.wakeAll();
+}
+
+} //namespace FAV