ignore if pause state not changed

src/AVDemuxThread.cpp

@@ -115,6 +115,8 @@ void AVDemuxThread::stop()
 
 void AVDemuxThread::pause(bool p)
 {
+    if (paused == p)
+        return;
     paused = p;
     if (!paused)
         cond.wakeAll();

src/AVOutput.cpp

@@ -54,6 +54,8 @@ bool AVOutput::isAvailable() const
 void AVOutput::pause(bool p)
 {
     DPTR_D(AVOutput);
+    if (d.paused == p)
+        return;
     d.paused = p;
     if (!d.paused)
         d.cond.wakeAll();

src/AVThread.cpp

@@ -55,6 +55,8 @@ void AVThread::stop()
 void AVThread::pause(bool p)
 {
     DPTR_D(AVThread);
+    if (d.paused == p)
+        return;
     d.paused = p;
     if (!d.paused) {
         qDebug("wake up paused thread");