diff js/loudness.js @ 2538:464c6c6692d6

Beautified entire project.

--- a/js/loudness.js	Mon Nov 14 12:11:38 2016 +0000
+++ b/js/loudness.js	Mon Nov 14 14:17:03 2016 +0000
@@ -8,98 +8,88 @@
 
 var interval_cal_loudness_event = null;
 
-if (typeof OfflineAudioContext == "undefined"){
-	var OfflineAudioContext = webkitOfflineAudioContext;
+if (typeof OfflineAudioContext == "undefined") {
+    var OfflineAudioContext = webkitOfflineAudioContext;
 }
 
-function calculateLoudness(buffer, timescale, target, offlineContext)
-{
-	// This function returns the EBU R 128 specification loudness model and sets the linear gain required to match -23 LUFS
-	// buffer -> Web Audio API Buffer object
-	// timescale -> M or Momentary (returns Array), S or Short (returns Array),
-	//   I or Integrated (default, returns number)
-	// target -> default is -23 LUFS but can be any LUFS measurement.
-	if(navigator.platform == 'iPad' || navigator.platform == 'iPhone') {
+function calculateLoudness(buffer, timescale, target, offlineContext) {
+    // This function returns the EBU R 128 specification loudness model and sets the linear gain required to match -23 LUFS
+    // buffer -> Web Audio API Buffer object
+    // timescale -> M or Momentary (returns Array), S or Short (returns Array),
+    //   I or Integrated (default, returns number)
+    // target -> default is -23 LUFS but can be any LUFS measurement.
+    if (navigator.platform == 'iPad' || navigator.platform == 'iPhone') {
         buffer.ready();
     }
-	if (buffer == undefined)
-	{
-		return 0;
-	}
-	if (timescale == undefined)
-	{
-		timescale = "I";
-	}
-	if (target == undefined)
-	{
-		target = -23;
-	}
-	if (offlineContext == undefined)
-	{
-		offlineContext = new OfflineAudioContext(audioContext.destination.channelCount, buffer.buffer.duration*audioContext.sampleRate, audioContext.sampleRate);
-	}
-	// Create the required filters
-	var KFilter = offlineContext.createBiquadFilter();
-	KFilter.type = "highshelf";
-	KFilter.gain.value = 4;
-	KFilter.frequency.value = 1500;
-	
-	var HPFilter = offlineContext.createBiquadFilter();
-	HPFilter.type = "highpass";
-	HPFilter.Q.value = 0.5;
-	HPFilter.frequency.value = 38;
-	// copy Data into the process buffer
-	var processSource = offlineContext.createBufferSource();
-	processSource.buffer = buffer.buffer;
-	
-	processSource.connect(KFilter);
-	KFilter.connect(HPFilter);
-	HPFilter.connect(offlineContext.destination);
-	offlineContext.oncomplete = function(renderedBuffer) {
-		// Have the renderedBuffer information, now continue processing
-		if (typeof renderedBuffer.renderedBuffer == 'object') {
-			renderedBuffer = renderedBuffer.renderedBuffer;
-		}
-		switch(timescale)
-		{
-		case "I":
-            // Calculate the Mean Squared of a signal
-            var MS = calculateMeanSquared(renderedBuffer,0.4,0.75);
-            // Calculate the Loudness of each block
-            var MSL = calculateLoudnessFromBlocks(MS);
-            // Get blocks from Absolute Gate
-            var LK = loudnessGate(MSL,MS,-70);
-            // Calculate Loudness
-            var LK_gate = loudnessOfBlocks(LK);
-            // Get blocks from Relative Gate
-            var RK = loudnessGate(MSL,MS,LK_gate-10);
-            var RK_gate = loudnessOfBlocks(RK);
-            buffer.buffer.lufs = RK_gate;
-		}
+    if (buffer == undefined) {
+        return 0;
+    }
+    if (timescale == undefined) {
+        timescale = "I";
+    }
+    if (target == undefined) {
+        target = -23;
+    }
+    if (offlineContext == undefined) {
+        offlineContext = new OfflineAudioContext(audioContext.destination.channelCount, buffer.buffer.duration * audioContext.sampleRate, audioContext.sampleRate);
+    }
+    // Create the required filters
+    var KFilter = offlineContext.createBiquadFilter();
+    KFilter.type = "highshelf";
+    KFilter.gain.value = 4;
+    KFilter.frequency.value = 1500;
+
+    var HPFilter = offlineContext.createBiquadFilter();
+    HPFilter.type = "highpass";
+    HPFilter.Q.value = 0.5;
+    HPFilter.frequency.value = 38;
+    // copy Data into the process buffer
+    var processSource = offlineContext.createBufferSource();
+    processSource.buffer = buffer.buffer;
+
+    processSource.connect(KFilter);
+    KFilter.connect(HPFilter);
+    HPFilter.connect(offlineContext.destination);
+    offlineContext.oncomplete = function (renderedBuffer) {
+        // Have the renderedBuffer information, now continue processing
+        if (typeof renderedBuffer.renderedBuffer == 'object') {
+            renderedBuffer = renderedBuffer.renderedBuffer;
+        }
+        switch (timescale) {
+            case "I":
+                // Calculate the Mean Squared of a signal
+                var MS = calculateMeanSquared(renderedBuffer, 0.4, 0.75);
+                // Calculate the Loudness of each block
+                var MSL = calculateLoudnessFromBlocks(MS);
+                // Get blocks from Absolute Gate
+                var LK = loudnessGate(MSL, MS, -70);
+                // Calculate Loudness
+                var LK_gate = loudnessOfBlocks(LK);
+                // Get blocks from Relative Gate
+                var RK = loudnessGate(MSL, MS, LK_gate - 10);
+                var RK_gate = loudnessOfBlocks(RK);
+                buffer.buffer.lufs = RK_gate;
+        }
         buffer.ready();
-	};
+    };
     processSource.start(0);
-	offlineContext.startRendering();
+    offlineContext.startRendering();
 }
 
-function calculateMeanSquared(buffer,frame_dur,frame_overlap)
-{
-    frame_size = Math.floor(buffer.sampleRate*frame_dur);
-    step_size = Math.floor(frame_size*(1.0-frame_overlap));
-    num_frames = Math.floor((buffer.length-frame_size)/step_size);
-    
+function calculateMeanSquared(buffer, frame_dur, frame_overlap) {
+    frame_size = Math.floor(buffer.sampleRate * frame_dur);
+    step_size = Math.floor(frame_size * (1.0 - frame_overlap));
+    num_frames = Math.floor((buffer.length - frame_size) / step_size);
+
     MS = Array(buffer.numberOfChannels);
-    for (var c=0; c<buffer.numberOfChannels; c++)
-    {
+    for (var c = 0; c < buffer.numberOfChannels; c++) {
         MS[c] = new Float32Array(num_frames);
         var data = buffer.getChannelData(c);
-        for (var no=0; no<num_frames; no++)
-        {
+        for (var no = 0; no < num_frames; no++) {
             MS[c][no] = 0.0;
-            for (var ptr=0; ptr<frame_size; ptr++)
-            {
-                var sample = data[no*step_size+ptr];
-                MS[c][no] += sample*sample;
+            for (var ptr = 0; ptr < frame_size; ptr++) {
+                var sample = data[no * step_size + ptr];
+                MS[c][no] += sample * sample;
             }
             MS[c][no] /= frame_size;
         }
@@ -107,41 +97,35 @@
     return MS;
 }
 
-function calculateLoudnessFromBlocks(blocks)
-{
+function calculateLoudnessFromBlocks(blocks) {
     var num_frames = blocks[0].length;
     var num_channels = blocks.length;
     var MSL = Array(num_frames);
-    for (var n=0; n<num_frames; n++)
-    {
+    for (var n = 0; n < num_frames; n++) {
         var sum = 0;
-        for (var c=0; c<num_channels; c++)
-        {
+        for (var c = 0; c < num_channels; c++) {
             var G = 1.0;
-            if(G >= 3){G = 1.41;}
-            sum += blocks[c][n]*G;
+            if (G >= 3) {
+                G = 1.41;
+            }
+            sum += blocks[c][n] * G;
         }
-        MSL[n] = -0.691 + 10*Math.log10(sum);
+        MSL[n] = -0.691 + 10 * Math.log10(sum);
     }
     return MSL;
 }
 
-function loudnessGate(blocks,source,threshold)
-{
+function loudnessGate(blocks, source, threshold) {
     var num_frames = source[0].length;
     var num_channels = source.length;
     var LK = Array(num_channels);
-    for (var c=0; c<num_channels; c++)
-    {
+    for (var c = 0; c < num_channels; c++) {
         LK[c] = [];
     }
-    
-    for (var n=0; n<num_frames; n++)
-    {
-        if (blocks[n] > threshold)
-        {
-            for (var c=0; c<num_channels; c++)
-            {
+
+    for (var n = 0; n < num_frames; n++) {
+        if (blocks[n] > threshold) {
+            for (var c = 0; c < num_channels; c++) {
                 LK[c].push(source[c][n]);
             }
         }
@@ -149,23 +133,22 @@
     return LK;
 }
 
-function loudnessOfBlocks(blocks)
-{
+function loudnessOfBlocks(blocks) {
     var num_frames = blocks[0].length;
     var num_channels = blocks.length;
     var loudness = 0.0;
-    for (var n=0; n<num_frames; n++)
-    {
+    for (var n = 0; n < num_frames; n++) {
         var sum = 0;
-        for (var c=0; c<num_channels; c++)
-        {
+        for (var c = 0; c < num_channels; c++) {
             var G = 1.0;
-            if(G >= 3){G = 1.41;}
-            sum += blocks[c][n]*G;
+            if (G >= 3) {
+                G = 1.41;
+            }
+            sum += blocks[c][n] * G;
         }
         sum /= num_frames;
         loudness += sum;
     }
     loudness = -0.691 + 10 * Math.log10(loudness);
     return loudness;
-}
\ No newline at end of file
+}