midimal - npm Package Compare versions

Comparing version 0.0.1 to 0.0.2

lib/utils.js

@@ -30,3 +30,3 @@ var Levenshtein = require('levenshtein');
 	var props = {
-		channel: 0,
+		channel: -1,
 		key: 0,
@@ -276,3 +276,3 @@ velocity: 63,
 		id: 0,
-		channel: 0,
+		channel: -1,
 		isPercussion: false
@@ -279,0 +279,0 @@ };

lib/writer.js

@@ -44,2 +44,5 @@ var var_length_buffer = require(__dirname+'/utils.js').var_length_buffer;
 
+var beats_per_minute = 120;
+var ticks_per_beat = 60000/beats_per_minute; //All time-deltas are in miliseconds
+
 function MIDImalWriter(stream) {
@@ -56,6 +59,8 @@ var _this = this;
 		stream.write(tracks);
-		stream.write(new Buffer([0xE7, 0x28])); //All time-deltas are in miliseconds
+		var timing = new Buffer(2);
+		timing.writeUInt16BE(ticks_per_beat, 0);
+		stream.write(timing);
 	};
 	var writeTrack = function(track) {
-		var totalLength = 0;
+		var totalLength = 4;
 		var buffers = [];
@@ -74,2 +79,3 @@ track.forEach(function(event) {
 		});
+		stream.write(new Buffer([0x00, 0xFF, 0x2F, 0x00])); //End-of-track event
 	};
@@ -80,2 +86,3 @@
 		var percussionInstrument = null;
+		var trackNumber = _this.tracks.length;
 		_this.tracks.push(track);
@@ -91,6 +98,6 @@
 				notes.forEach(function(note_info) {
+					if(note_info.note.toVal) {
+						note_info.note = note_info.note.toVal();
+					}
 					if(percussionInstrument !== null) {
-						if(note_info.note.toVal) {
-							note_info.note = note_info.note.toVal();
-						}
 						if(!note_info.note.force) {
@@ -100,2 +107,7 @@ note_info.note.key = percussionInstrument;
 						note_info.note.channel = 9;
+					} else if(note_info.note.channel === -1) {
+						note_info.note.channel = trackNumber%15;
+						if(note_info.note.channel >= 9) {
+							note_info.note.channel++;
+						}
 					}
@@ -121,2 +133,5 @@ absolutePosition += note_info.delta; //Absolutize deltas to make the events sortable
 				}
+				if(instrument.channel === -1) {
+					instrument.channel = trackNumber%16;
+				}
 				if(instrument.isPercussion) {
@@ -123,0 +138,0 @@ percussionInstrument = instrument.id;

package.json

@@ -6,3 +6,3 @@ {
   "keywords": ["midi", "audio"],
-  "version": "0.0.1",
+  "version": "0.0.2",
   "repository": {
@@ -9,0 +9,0 @@ "type": "git",

No alert changes

Improved metrics

Total package byte prevSize

11684

increased by4.51%

Lines of code

466

increased by3.1%

No dependency changes