getDelta()

jazz-soft · Aug 3, 2023 · ed59edc · ed59edc
1 parent 876957e
commit ed59edc
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Showing 3 changed files with 9 additions and 2 deletions.
diff --git a/javascript/JZZ.js b/javascript/JZZ.js
@@ -3016,13 +3016,17 @@
   UMP.prototype.getTimeSignature = function() {
     if (this.isTimeSignature()) return [this[4], 1 << this[5]];
   };
+  UMP.prototype.getDelta = function() {
+    if (this.isDelta()) return ((this[1] & 15) << 16) + (this[2] << 8) + this[3];
+  };
 
   UMP.prototype.isTempo = function() {
     return (this[0] >> 4) == 13 && (this[1] >> 4) == 1 &&  this[2] == 0 &&  this[3] == 0;
   };
   UMP.prototype.isTimeSignature = function() {
     return (this[0] >> 4) == 13 && (this[1] >> 4) == 1 &&  this[2] == 0 &&  this[3] == 1;
   };
+  UMP.prototype.isDelta = function() { return this[0] == 0 && (this[1] >> 4) == 4; };
   UMP.prototype.isStartClip = function() { return this.match([0xf0, 0x20, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0]); };
   UMP.prototype.isEndClip = function() { return this.match([0xf0, 0x21, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0]); };
 

diff --git a/package.json b/package.json
@@ -22,7 +22,7 @@
     "jazz-midi": "^1.7.9"
   },
   "devDependencies": {
-    "eslint": "^8.44.0",
+    "eslint": "^8.46.0",
     "grunt": "^1.6.1",
     "grunt-contrib-jshint": "^3.2.0",
     "grunt-contrib-uglify": "^5.2.2",

diff --git a/test/common.js b/test/common.js
@@ -774,6 +774,7 @@ describe('UMP messages', function() {
     var s = '00000000 -- NOOP';
     var msg =JZZ.UMP.noop();
     assert.equal(typeof msg.getGroup(), 'undefined');
+    assert.equal(typeof msg.getDelta(), 'undefined');
     assert.equal(msg.toString(), s);
     msg = new JZZ.UMP(msg);
     assert.equal(msg.toString(), s);
@@ -860,8 +861,10 @@ describe('UMP messages', function() {
     assert.throws(function() { JZZ.UMP.umpTicksPQN(0x10000); });
   });
   it('umpDelta', function() {
+    var msg = JZZ.UMP.umpDelta(96);
+    assert.equal(msg.getDelta(), 96);
+    assert.equal(msg.toString(), '00400060 -- Delta Ticks');
     assert.equal(JZZ.UMP.umpDelta().toString(), '00400000 -- Delta Ticks');
-    assert.equal(JZZ.UMP.umpDelta(96).toString(), '00400060 -- Delta Ticks');
     assert.throws(function() { JZZ.UMP.umpDelta(0x100000); });
   });
   it('umpStartClip', function() {