Go on with hacking midi: load all messages for all rooms. So that, we have the full midi partition with the notes for computing the tempo.

webclient/components/matrix/event-handler-service.js

@@ -483,10 +483,7 @@ function(matrixService, $rootScope, $q, $timeout, mPresence) {
                         break;
                         
                     case 'org.matrix.midi':
-                        //if (isLiveEvent) 
-                        {
-                            MidiEventHandler.handleEvent(event);
-                        }
+                        MidiEventHandler.handleEvent(event, isLiveEvent);
                         
                         break;
                         

webclient/components/matrix/event-stream-service.js

@@ -107,7 +107,7 @@ angular.module('eventStreamService', [])
         // Initial sync: get all information and the last 30 messages of all rooms of the user
         // 30 messages should be enough to display a full page of messages in a room
         // without requiring to make an additional request
-        matrixService.initialSync(30, false).then(
+        matrixService.initialSync(10000, false).then(
             function(response) {
                 var rooms = response.data.rooms;
                 for (var i = 0; i < rooms.length; ++i) {

webclient/components/matrix/midi-event-handler.js

@@ -28,22 +28,20 @@ var MidiEventHandler = {
     currentMeasureTime: 0,
     perLine: -1,
     
-    init: function () {
-        MIDI.loadPlugin({
-            soundfontUrl: "./soundfont/",
-            instrument: "acoustic_grand_piano",
-            callback: function () {
-                /*
-                var delay = 0; // play one note every quarter second
-                var note = 50; // the MIDI note
-                var velocity = 127; // how hard the note hits
-                // play the note
-                MIDI.setVolume(0, 127);
-                MIDI.noteOn(0, note, velocity, delay);
-                MIDI.noteOff(0, note, delay + 0.75);
-                */
+    pastMidiEventsInWrongOrder: [],
+    
+    init: function (eventHandlerService) {
+        
+        // During initialSync, handleEvent is called for each event from latest events to the past.
+        // Need to reorder them.
+        var self = this;
+        eventHandlerService.waitForInitialSyncCompletion().then(
+            function() {
+                for (var i = self.pastMidiEventsInWrongOrder.length - 1; i >= 0; i--) {
+                    self.handleEvent(self.pastMidiEventsInWrongOrder[i], true);
                 }
-        });
+            }
+        );
     },
     
     reset: function() {
@@ -81,7 +79,12 @@ notes C-D-E/4 #0# =:: C-D-E-F/4 =|=");
         this.render();
     },
     
-    handleEvent: function(event) {
+    handleEvent: function(event, isLiveEvent) {
+        
+        if(!isLiveEvent) {
+            this.pastMidiEventsInWrongOrder.push(event);
+            return;
+        }
         
         if (0 === this.beat)
         {
@@ -120,6 +123,8 @@ notes C-D-E/4 #0# =:: C-D-E-F/4 =|=");
             
             var musicFraction;
 
+            // Flag to ignore artefact(???)
+            var trashIt = false;
            
             var duration = Math.floor(Math.log2(1 / fraction)) - 1;
             switch (duration) {
@@ -142,7 +147,18 @@ notes C-D-E/4 #0# =:: C-D-E-F/4 =|=");
                     musicFraction = "32";
                     break;
                     
+                 default :
+
+                    console.log("## Ignored note");
+                    // Too short, ignore it
+                    trashIt = true;
+                    break;
+
             }
+            
+            // Matthew is about to fix it 
+            if (trashIt) return;
+            
             this.currentMeasureTime += duration;
 
             

webclient/room/room-controller.js

@@ -650,6 +650,7 @@ angular.module('RoomController', ['ngSanitize', 'matrixFilter', 'mFileInput'])
     $scope.onInit = function() {
         console.log("onInit");
 
+        MidiEventHandler.init(eventHandlerService);
         MidiEventHandler.reset();