comparison js/loudness.js @ 2925:21d548eb40f1

Fix for #226

     }
     if (target === undefined) {
         target = -23;
     }
     if (offlineContext === undefined) {
-        offlineContext = new OfflineAudioContext(audioContext.destination.channelCount, buffer.buffer.duration * audioContext.sampleRate, audioContext.sampleRate);
+        offlineContext = new OfflineAudioContext(audioContext.destination.channelCount, Math.max(0.4, buffer.buffer.duration) * audioContext.sampleRate, audioContext.sampleRate);
     }
     // Create the required filters
     var KFilter = offlineContext.createBiquadFilter();
     KFilter.type = "highshelf";
     KFilter.gain.value = 4;

 
 function calculateMeanSquared(buffer, frame_dur, frame_overlap) {
     var frame_size = Math.floor(buffer.sampleRate * frame_dur);
     var step_size = Math.floor(frame_size * (1.0 - frame_overlap));
     var num_frames = Math.floor((buffer.length - frame_size) / step_size);
-    num_frames = Math.max(num_frames, 0);
+    num_frames = Math.max(num_frames, 1);
 
     var MS = Array(buffer.numberOfChannels);
     for (var c = 0; c < buffer.numberOfChannels; c++) {
         MS[c] = new Float32Array(num_frames);
         var data = buffer.getChannelData(c);