CTRL-click on an audio device to display debug FFT window

CaseLights/AppDelegate.m

@@ -648,6 +648,9 @@
         
         // Send command to turn off LEDs
         [self setLightsR:0 G:0 B:0];
+        
+        // Close debug window, if created
+        [AudioVisualizer setShowWindow:NO];
     } else {
         // Try to restore last LED setting
         if (lastLEDMode != nil) {
@@ -780,6 +783,7 @@
     }
     
     // Check if it is an audio input device
+    BOOL foundAudioDev = NO;
     if ((found == NO) && ([sender tag] == MENU_ITEM_TAG_AUDIO)) {
         // Stop previous timer setting
         if (animation != nil) {
@@ -788,7 +792,6 @@
         }
         
         found = YES;
-        BOOL foundDev = NO;
         NSArray *audioDevices = [EZAudioDevice inputDevices];
         for (int  i = 0; i < [audioDevices count]; i++) {
             EZAudioDevice *dev = [audioDevices objectAtIndex:i];
@@ -797,7 +800,7 @@
                 [self setLightsR:0 G:0 B:0];
                 
                 // Found device
-                foundDev = YES;
+                foundAudioDev = YES;
                 if (microphone != nil) {
                     [microphone setMicrophoneOn:NO];
                 } else {
@@ -809,7 +812,7 @@
             }
         }
         
-        if (foundDev == NO) {
+        if (foundAudioDev == NO) {
             NSLog(@"Couldn't find device \"%@\"\n", [sender title]);
             [sender setState:NSOffState];
             
@@ -828,6 +831,14 @@
             }
             
             return; // Don't store new mode
+        } else {
+            // Show debug window if CTRL is held while clicking on audio device
+            NSUInteger mods = [NSEvent modifierFlags] & NSDeviceIndependentModifierFlagsMask;
+            if (mods & NSControlKeyMask) {
+                [AudioVisualizer setShowWindow:YES];
+            } else {
+                [AudioVisualizer setShowWindow:NO];
+            }
         }
     }
     
@@ -871,6 +882,8 @@
             NSLog(@"Unknown LED Visualization selected!\n");
             return;
         }
+    } else if (foundAudioDev == NO) {
+        [AudioVisualizer setShowWindow:NO];
     }
     
     // Store changed value in preferences

CaseLights/AudioVisualizer.h

@@ -14,6 +14,7 @@
 
 + (void)setDelegate:(AppDelegate *)delegate;
 + (void)setSensitivity:(float)sens;
++ (void)setShowWindow:(BOOL)showWindow;
 + (void)updateBuffer:(float *)buffer withBufferSize:(UInt32)bufferSize;
 
 @end

CaseLights/AudioVisualizer.m

@@ -14,11 +14,6 @@
 //
 
 #ifdef DEBUG
-#define DEBUG_PLOT_FFT
-//#define DEBUG_PLOT_FFT_RAW
-#endif
-
-#ifdef DEBUG_PLOT_FFT
 #define DEBUG_LOG_BEATS
 #endif
 
@@ -26,10 +21,7 @@
 #import "AppDelegate.h"
 
 #import "EZAudioFFT.h"
-
-#ifdef DEBUG_PLOT_FFT
 #import "EZAudioPlot.h"
-#endif
 
 // Parameters for fine-tuning beat detection
 #define FFT_BUCKET_COUNT 64
@@ -55,11 +47,27 @@ static AppDelegate *appDelegate = nil;
 static EZAudioFFT *fft = nil;
 static int maxBufferSize = 0;
 static float sensitivity = 1.0f;
+static float history[FFT_BUCKET_COUNT][FFT_BUCKET_HISTORY];
+static int nextHistory =  0;
+static int samplesPerBucket = 0;
+static unsigned char lastRed = 0, lastGreen = 0, lastBlue = 0;
+
+static BOOL shouldShowWindow = NO;
+static NSWindow *window = nil;
+static EZAudioPlot *plot = nil;
+static NSTextField *label = nil;
 
 @implementation AudioVisualizer
 
 + (void)setDelegate:(AppDelegate *)delegate {
     appDelegate = delegate;
+    
+    // Initialize static history variables
+    for (int i = 0; i < FFT_BUCKET_COUNT; i++) {
+        for (int j = 0; j < FFT_BUCKET_HISTORY; j++) {
+            history[i][j] = 0.5f;
+        }
+    }
 }
 
 + (void)setSensitivity:(float)sens {
@@ -70,6 +78,7 @@ static float sensitivity = 1.0f;
     // Create Fast Fourier Transformation object
     if (fft == nil) {
         maxBufferSize = bufferSize;
+        samplesPerBucket = bufferSize / FFT_BUCKET_COUNT;
         fft = [EZAudioFFT fftWithMaximumBufferSize:maxBufferSize sampleRate:appDelegate.microphone.audioStreamBasicDescription.mSampleRate];
         
 #ifdef DEBUG
@@ -81,6 +90,7 @@ static float sensitivity = 1.0f;
     if (bufferSize > maxBufferSize) {
         NSLog(@"Buffer Size changed?! %d != %d\n", maxBufferSize, bufferSize);
         maxBufferSize = bufferSize;
+        samplesPerBucket = bufferSize / FFT_BUCKET_COUNT;
         fft = [EZAudioFFT fftWithMaximumBufferSize:maxBufferSize sampleRate:appDelegate.microphone.audioStreamBasicDescription.mSampleRate];
     }
     
@@ -94,20 +104,6 @@ static float sensitivity = 1.0f;
     // Perform fast fourier transformation
     [fft computeFFTWithBuffer:buffer withBufferSize:bufferSize];
     
-    static float history[FFT_BUCKET_COUNT][FFT_BUCKET_HISTORY];
-    static int nextHistory =  0;
-    static int samplesPerBucket = 0;
-    
-    // Initialize static variables
-    if (samplesPerBucket == 0) {
-        samplesPerBucket = bufferSize / FFT_BUCKET_COUNT;
-        for (int i = 0; i < FFT_BUCKET_COUNT; i++) {
-            for (int j = 0; j < FFT_BUCKET_HISTORY; j++) {
-                history[i][j] = 0.5f;
-            }
-        }
-    }
-    
     // Split FFT output into a small number of 'buckets' or 'bins' and add to circular history buffer
     for (int i = 0; i < FFT_BUCKET_COUNT; i++) {
         float sum = 0.0f;
@@ -117,17 +113,13 @@ static float sensitivity = 1.0f;
         history[i][nextHistory] = sum / samplesPerBucket;
     }
     
-#ifdef DEBUG_PLOT_FFT
-    int beatCount = 0;
-#endif
-    
     // Slowly fade old colors to black
-    static unsigned char lastRed = 0, lastGreen = 0, lastBlue = 0;
     lastRed = lastRed * FFT_COLOR_DECAY;
     lastGreen = lastGreen * FFT_COLOR_DECAY;
     lastBlue = lastBlue * FFT_COLOR_DECAY;
     
     // Check for any beats
+    int beatCount = 0;
     for (int i = 0; i < FFT_BUCKET_COUNT; i++) {
         // Skip frequency bands, if required
 #ifdef FFT_BUCKET_SKIP_CONDITION
@@ -172,9 +164,7 @@ static float sensitivity = 1.0f;
             NSLog(@"Beat in %d with c: %f v: %f", i, (history[i][nextHistory] / average), v);
 #endif
             
-#ifdef DEBUG_PLOT_FFT
             beatCount++;
-#endif
         }
     }
     
@@ -187,67 +177,23 @@ static float sensitivity = 1.0f;
         lastSentBlue = lastBlue;
     }
 
-    // Display debug FFT plot, if required
-#ifdef DEBUG_PLOT_FFT
-    static NSWindow *window = nil;
-    static EZAudioPlot *plot = nil;
-    static NSTextField *label = nil;
-    if ((window == nil) || (plot == nil) || (label == nil)) {
-        // Create window
-        NSRect frame = NSMakeRect(450, 300, 600, 400);
-        window = [[NSWindow alloc] initWithContentRect:frame
-                                             styleMask:NSClosableWindowMask | NSTitledWindowMask | NSBorderlessWindowMask
-                                               backing:NSBackingStoreBuffered
-                                                 defer:NO];
-        [window setTitle:@"Debug FFT"];
-        
-        // Create FFT Plot and add to window
-        plot = [[EZAudioPlot alloc] initWithFrame:window.contentView.frame];
-        plot.color = [NSColor whiteColor];
-        plot.shouldOptimizeForRealtimePlot = NO; // Not working with 'YES' here?!
-        plot.shouldFill = YES;
-        plot.shouldCenterYAxis = NO;
-        plot.shouldMirror = NO;
-        plot.plotType = EZPlotTypeBuffer;
-        [window.contentView addSubview:plot];
-        
-        // Create beat count label
-        label = [[NSTextField alloc] initWithFrame:NSMakeRect(0, 380, 600, 20)];
-        [label setTextColor:[NSColor whiteColor]];
-        [label setEditable:NO];
-        [label setBezeled:NO];
-        [label setDrawsBackground:NO];
-        [label setSelectable:NO];
-        [label setStringValue:@"-"];
-        [window.contentView addSubview:label];
+    // Update debug FFT plot, if required
+    if (shouldShowWindow && (window != nil) && (plot != nil) && (label != nil)) {
+        for (UInt32 i = 0; i < FFT_BUCKET_COUNT; i++) {
+            // Copy output to input buffer (a bit ugly, but is always big enough)
+            buffer[i] = history[i][nextHistory];
+            
+            // Scale so user can see something
+            buffer[i] *= FFT_DEBUG_FACTOR;
+            if (buffer[i] > 1.0f) buffer[i] = 1.0f;
+            if (buffer[i] < -1.0f) buffer[i] = -1.0f;
+        }
+        [plot updateBuffer:buffer withBufferSize:bufferSize];
         
-        // Make window visible
-        [window makeKeyAndOrderFront:appDelegate.application];
-        NSLog(@"Created debugging FFT Plot window...\n");
-    }
-    
-    // Copy output to input buffer (a bit ugly, but is always big enough)
-    // Scale so user can see something
-# ifdef DEBUG_PLOT_FFT_RAW
-    memcpy(buffer, fft.fftData, bufferSize * sizeof(float));
-    for (UInt32 i = 0; i < bufferSize; i++) {
-        buffer[i] *= FFT_DEBUG_RAW_FACTOR;
-# else
-    for (int i = 0; i < FFT_BUCKET_COUNT; i++) {
-        buffer[i] = history[i][nextHistory];
+        // Change background color to match color output and show beat counter
+        [window setBackgroundColor:[NSColor colorWithCalibratedRed:lastRed / 255.0 green:lastGreen / 255.0 blue:lastBlue / 255.0 alpha:1.0]];
+        [label setStringValue:[NSString stringWithFormat:@"Beats: %d", beatCount]];
     }
-    for (UInt32 i = 0; i < FFT_BUCKET_COUNT; i++) {
-        buffer[i] *= FFT_DEBUG_FACTOR;
-# endif
-        if (buffer[i] > 1.0f) buffer[i] = 1.0f;
-        if (buffer[i] < -1.0f) buffer[i] = -1.0f;
-    }
-    [plot updateBuffer:buffer withBufferSize:bufferSize];
-    
-    // Change background color to match color output and show beat counter
-    [window setBackgroundColor:[NSColor colorWithCalibratedRed:lastRed / 255.0 green:lastGreen / 255.0 blue:lastBlue / 255.0 alpha:1.0]];
-    [label setStringValue:[NSString stringWithFormat:@"Beats: %d", beatCount]];
-#endif
         
     // Point to next history buffer
     nextHistory++;
@@ -256,4 +202,65 @@ static float sensitivity = 1.0f;
     }
 }
 
++ (void)setShowWindow:(BOOL)showWindow {
+    shouldShowWindow = showWindow;
+    
+    // Close window if it was visible and should no longer be
+    if (showWindow == YES) {
+        if ((window == nil) || (plot == nil) || (label == nil)) {
+            // Create window
+            NSRect frame = NSMakeRect(450, 300, 600, 400);
+            window = [[NSWindow alloc] initWithContentRect:frame
+                                                 styleMask:NSClosableWindowMask | NSTitledWindowMask | NSBorderlessWindowMask
+                                                   backing:NSBackingStoreBuffered
+                                                     defer:NO];
+            [window setTitle:@"CaseLights FFT"];
+            [window setReleasedWhenClosed:NO];
+            
+            // Create FFT Plot and add to window
+            plot = [[EZAudioPlot alloc] initWithFrame:window.contentView.frame];
+            plot.color = [NSColor whiteColor];
+            plot.shouldOptimizeForRealtimePlot = NO; // Not working with 'YES' here?!
+            plot.shouldFill = YES;
+            plot.shouldCenterYAxis = NO;
+            plot.shouldMirror = NO;
+            plot.plotType = EZPlotTypeBuffer;
+            [window.contentView addSubview:plot];
+            
+            // Create beat count label
+            label = [[NSTextField alloc] initWithFrame:NSMakeRect(0, 380, 600, 20)];
+            [label setTextColor:[NSColor whiteColor]];
+            [label setEditable:NO];
+            [label setBezeled:NO];
+            [label setDrawsBackground:NO];
+            [label setSelectable:NO];
+            [label setStringValue:@"-"];
+            [window.contentView addSubview:label];
+            
+#ifdef DEBUG
+            NSLog(@"Created debugging FFT Plot window...\n");
+#endif
+        }
+        
+        if ([window isVisible] == NO) {
+            // Make window visible
+            [window makeKeyAndOrderFront:appDelegate.application];
+            
+#ifdef DEBUG
+            NSLog(@"Made debugging FFT Plot window visible...\n");
+#endif
+        }
+    } else {
+        if (window != nil) {
+            if ([window isVisible] == YES) {
+                [window close];
+                
+#ifdef DEBUG
+                NSLog(@"Closed debugging FFT Plot window...\n");
+#endif
+            }
+        }
+    }
+}
+
 @end

CaseLights/Info.plist

@@ -21,7 +21,7 @@
 	<key>CFBundleSignature</key>
 	<string>????</string>
 	<key>CFBundleVersion</key>
-	<string>410</string>
+	<string>415</string>
 	<key>LSApplicationCategoryType</key>
 	<string>public.app-category.utilities</string>
 	<key>LSMinimumSystemVersion</key>

README.md

@@ -25,6 +25,7 @@ CaseLights is only visible in the system menu bar. You can enable or disable the
 You can also select one of the displays connected to the Host machine. The CaseLights App will then create a Screenshot of this display 10-times per second and calculate the average color to display it on the RGB LEDs.
 
 CaseLights is also able to visualize sound coming from a system audio input. To be able to directly visualize the system sound output, install [Soundflower](https://github.com/mattingalls/Soundflower) and create a Multi-Output-Device in the Mac `Audio Midi Setup.app` consisting of `Soundflower (2ch)` and your normally used output device. Set this device as audio output. Then, in CaseLights, select `Soundflower (2ch)` as input.
+Click on an audio device with a CTRL-click to display a window with the fast-fourier-transformation plot.
 
 ## Working with Git Submodules