visualizer: set refresh rate to 0.5 sec if mpd is not playing

src/status.cpp

@@ -38,6 +38,7 @@
 #include "settings.h"
 #include "status.h"
 #include "tag_editor.h"
+#include "visualizer.h"
 
 using Global::myScreen;
 using Global::wFooter;
@@ -324,7 +325,8 @@ void NcmpcppStatusChanged(MPD::Connection *, MPD::StatusChanges changed, void *)
 	}
 	if (changed.PlayerState)
 	{
-		switch (Mpd.GetState())
+		MPD::PlayerState state = Mpd.GetState();
+		switch (state)
 		{
 			case MPD::psUnknown:
 			{
@@ -366,9 +368,17 @@ void NcmpcppStatusChanged(MPD::Connection *, MPD::StatusChanges changed, void *)
 				}
 				else
 					player_state.clear();
+#				ifdef ENABLE_VISUALIZER
+				if (myScreen == myVisualizer)
+					myVisualizer->Main()->Clear();
+#				endif // ENABLE_VISUALIZER
 				break;
 			}
 		}
+#		ifdef ENABLE_VISUALIZER
+		if (myScreen == myVisualizer)
+			wFooter->SetTimeout(state == MPD::psPlay ? Visualizer::WindowTimeout : ncmpcpp_window_timeout);
+#		endif // ENABLE_VISUALIZER
 		if (Config.new_design)
 		{
 			*wHeader << XY(0, 1) << fmtBold << player_state << fmtBoldEnd;

src/visualizer.cpp

@@ -41,6 +41,8 @@ const unsigned Visualizer::Samples = 2048;
 const unsigned Visualizer::FFTResults = Samples/2+1;
 #endif // HAVE_FFTW3_H
 
+int Visualizer::WindowTimeout = 1000/25; /* 25 fps */
+
 void Visualizer::Init()
 {
 	w = new Window(0, MainStartY, COLS, MainHeight, "", Config.main_color, brNone);
@@ -82,7 +84,7 @@ void Visualizer::SwitchTo()
 	itsTimer.tv_usec = 0;
 	
 	if (itsFifo >= 0)
-		Global::wFooter->SetTimeout(1000/25);
+		Global::wFooter->SetTimeout(WindowTimeout);
 	Global::RedrawHeader = 1;
 }
 
@@ -103,13 +105,11 @@ void Visualizer::Update()
 	if (itsFifo < 0)
 		return;
 	
-	// if mpd is stopped, clear the screen
-	if (!Mpd.isPlaying())
-	{
-		w->Clear();
-		w->Refresh();
+	// it supports only PCM in format 44100:16:1
+	static int16_t buf[Samples];
+	ssize_t data = read(itsFifo, buf, sizeof(buf));
+	if (data < 0) // no data available in fifo
 		return;
-	}
 	
 	if (itsOutputID != -1 && Global::Timer.tv_sec > itsTimer.tv_sec+Config.visualizer_sync_interval)
 	{
@@ -119,12 +119,6 @@ void Visualizer::Update()
 		gettimeofday(&itsTimer, 0);
 	}
 	
-	// it supports only PCM in format 44100:16:1
-	static int16_t buf[Samples];
-	ssize_t data = read(itsFifo, buf, sizeof(buf));
-	if (data < 0) // no data available in fifo
-		return;
-	
 	w->Clear();
 #	ifdef HAVE_FFTW3_H
 	Config.visualizer_use_wave ? DrawSoundWave(buf, data) : DrawFrequencySpectrum(buf, data);

src/visualizer.h

@@ -58,6 +58,8 @@ class Visualizer : public Screen<Window>
 		void ResetFD();
 		void FindOutputID();
 		
+		static int WindowTimeout;
+		
 	protected:
 		virtual void Init();