421 lines
14 KiB
JavaScript
421 lines
14 KiB
JavaScript
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/* Copyright 2013 Chris Wilson
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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// Initialize the MIDI library.
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(function (global) {
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'use strict';
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var midiIO, _requestMIDIAccess, MIDIAccess, _onReady, MIDIPort, MIDIInput, MIDIOutput, _midiProc;
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function Promise() {
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}
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Promise.prototype.then = function(accept, reject) {
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this.accept = accept;
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this.reject = reject;
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}
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Promise.prototype.succeed = function(access) {
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if (this.accept)
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this.accept(access);
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}
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Promise.prototype.fail = function(error) {
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if (this.reject)
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this.reject(error);
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}
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function _JazzInstance() {
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this.inputInUse = false;
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this.outputInUse = false;
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// load the Jazz plugin
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var o1 = document.createElement("object");
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o1.id = "_Jazz" + Math.random() + "ie";
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o1.classid = "CLSID:1ACE1618-1C7D-4561-AEE1-34842AA85E90";
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this.activeX = o1;
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var o2 = document.createElement("object");
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o2.id = "_Jazz" + Math.random();
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o2.type="audio/x-jazz";
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o1.appendChild(o2);
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this.objRef = o2;
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var e = document.createElement("p");
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e.appendChild(document.createTextNode("This page requires the "));
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var a = document.createElement("a");
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a.appendChild(document.createTextNode("Jazz plugin"));
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a.href = "http://jazz-soft.net/";
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e.appendChild(a);
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e.appendChild(document.createTextNode("."));
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o2.appendChild(e);
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var insertionPoint = document.getElementById("MIDIPlugin");
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if (!insertionPoint) {
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// Create hidden element
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var insertionPoint = document.createElement("div");
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insertionPoint.id = "MIDIPlugin";
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insertionPoint.style.position = "absolute";
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insertionPoint.style.visibility = "hidden";
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insertionPoint.style.left = "-9999px";
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insertionPoint.style.top = "-9999px";
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document.body.appendChild(insertionPoint);
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}
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insertionPoint.appendChild(o1);
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if (this.objRef.isJazz)
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this._Jazz = this.objRef;
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else if (this.activeX.isJazz)
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this._Jazz = this.activeX;
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else
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this._Jazz = null;
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if (this._Jazz) {
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this._Jazz._jazzTimeZero = this._Jazz.Time();
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this._Jazz._perfTimeZero = window.performance.now();
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}
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}
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_requestMIDIAccess = function _requestMIDIAccess() {
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var access = new MIDIAccess();
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return access._promise;
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};
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// API Methods
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function MIDIAccess() {
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this._jazzInstances = new Array();
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this._jazzInstances.push( new _JazzInstance() );
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this._promise = new Promise;
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if (this._jazzInstances[0]._Jazz) {
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this._Jazz = this._jazzInstances[0]._Jazz;
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window.setTimeout( _onReady.bind(this), 3 );
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} else {
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window.setTimeout( _onNotReady.bind(this), 3 );
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}
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};
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_onReady = function _onReady() {
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if (this._promise)
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this._promise.succeed(this);
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};
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function _onNotReady() {
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if (this._promise)
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this._promise.fail( { code: 1 } );
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};
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MIDIAccess.prototype.inputs = function( ) {
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if (!this._Jazz)
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return null;
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var list=this._Jazz.MidiInList();
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var inputs = new Array( list.length );
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for ( var i=0; i<list.length; i++ ) {
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inputs[i] = new MIDIInput( this, list[i], i );
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}
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return inputs;
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}
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MIDIAccess.prototype.outputs = function( ) {
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if (!this._Jazz)
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return null;
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var list=this._Jazz.MidiOutList();
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var outputs = new Array( list.length );
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for ( var i=0; i<list.length; i++ ) {
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outputs[i] = new MIDIOutput( this, list[i], i );
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}
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return outputs;
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};
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MIDIInput = function MIDIInput( midiAccess, name, index ) {
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this._listeners = [];
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this._midiAccess = midiAccess;
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this._index = index;
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this._inLongSysexMessage = false;
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this._sysexBuffer = new Uint8Array();
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this.id = "" + index + "." + name;
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this.manufacturer = "";
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this.name = name;
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this.type = "input";
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this.version = "";
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this.onmidimessage = null;
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var inputInstance = null;
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for (var i=0; (i<midiAccess._jazzInstances.length)&&(!inputInstance); i++) {
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if (!midiAccess._jazzInstances[i].inputInUse)
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inputInstance=midiAccess._jazzInstances[i];
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}
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if (!inputInstance) {
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inputInstance = new _JazzInstance();
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midiAccess._jazzInstances.push( inputInstance );
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}
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inputInstance.inputInUse = true;
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this._jazzInstance = inputInstance._Jazz;
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this._input = this._jazzInstance.MidiInOpen( this._index, _midiProc.bind(this) );
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};
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// Introduced in DOM Level 2:
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MIDIInput.prototype.addEventListener = function (type, listener, useCapture ) {
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if (type !== "midimessage")
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return;
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for (var i=0; i<this._listeners.length; i++)
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if (this._listeners[i] == listener)
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return;
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this._listeners.push( listener );
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};
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MIDIInput.prototype.removeEventListener = function (type, listener, useCapture ) {
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if (type !== "midimessage")
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return;
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for (var i=0; i<this._listeners.length; i++)
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if (this._listeners[i] == listener) {
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this._listeners.splice( i, 1 ); //remove it
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return;
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}
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};
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MIDIInput.prototype.preventDefault = function() {
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this._pvtDef = true;
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};
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MIDIInput.prototype.dispatchEvent = function (evt) {
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this._pvtDef = false;
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// dispatch to listeners
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for (var i=0; i<this._listeners.length; i++)
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if (this._listeners[i].handleEvent)
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this._listeners[i].handleEvent.bind(this)( evt );
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else
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this._listeners[i].bind(this)( evt );
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if (this.onmidimessage)
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this.onmidimessage( evt );
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return this._pvtDef;
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};
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MIDIInput.prototype.appendToSysexBuffer = function ( data ) {
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var oldLength = this._sysexBuffer.length;
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var tmpBuffer = new Uint8Array( oldLength + data.length );
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tmpBuffer.set( this._sysexBuffer );
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tmpBuffer.set( data, oldLength );
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this._sysexBuffer = tmpBuffer;
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};
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MIDIInput.prototype.bufferLongSysex = function ( data, initialOffset ) {
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var j = initialOffset;
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while (j<data.length) {
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if (data[j] == 0xF7) {
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// end of sysex!
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j++;
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this.appendToSysexBuffer( data.slice(initialOffset, j) );
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return j;
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}
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j++;
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}
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// didn't reach the end; just tack it on.
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this.appendToSysexBuffer( data.slice(initialOffset, j) );
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this._inLongSysexMessage = true;
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return j;
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};
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_midiProc = function _midiProc( timestamp, data ) {
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// Have to use createEvent/initEvent because IE10 fails on new CustomEvent. Thanks, IE!
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var length = 0;
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var i,j;
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var isSysexMessage = false;
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// Jazz sometimes passes us multiple messages at once, so we need to parse them out
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// and pass them one at a time.
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for (i=0; i<data.length; i+=length) {
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if (this._inLongSysexMessage) {
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i = this.bufferLongSysex(data,i);
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if ( data[i-1] != 0xf7 ) {
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// ran off the end without hitting the end of the sysex message
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return;
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}
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isSysexMessage = true;
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} else {
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isSysexMessage = false;
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switch (data[i] & 0xF0) {
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case 0x80: // note off
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case 0x90: // note on
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case 0xA0: // polyphonic aftertouch
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case 0xB0: // control change
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case 0xE0: // channel mode
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length = 3;
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break;
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case 0xC0: // program change
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case 0xD0: // channel aftertouch
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length = 2;
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break;
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case 0xF0:
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switch (data[i]) {
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case 0xf0: // variable-length sysex.
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i = this.bufferLongSysex(data,i);
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if ( data[i-1] != 0xf7 ) {
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// ran off the end without hitting the end of the sysex message
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return;
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}
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isSysexMessage = true;
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break;
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case 0xF1: // MTC quarter frame
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case 0xF3: // song select
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length = 2;
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break;
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case 0xF2: // song position pointer
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length = 3;
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break;
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default:
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length = 1;
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break;
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}
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break;
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}
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}
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var evt = document.createEvent( "Event" );
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evt.initEvent( "midimessage", false, false );
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evt.receivedTime = parseFloat( timestamp.toString()) + this._jazzInstance._perfTimeZero;
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if (isSysexMessage || this._inLongSysexMessage) {
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evt.data = new Uint8Array( this._sysexBuffer );
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this._sysexBuffer = new Uint8Array(0);
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this._inLongSysexMessage = false;
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} else
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evt.data = new Uint8Array(data.slice(i, length+i));
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this.dispatchEvent( evt );
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}
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};
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MIDIOutput = function MIDIOutput( midiAccess, name, index ) {
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this._listeners = [];
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this._midiAccess = midiAccess;
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this._index = index;
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this.id = "" + index + "." + name;
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this.manufacturer = "";
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this.name = name;
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this.type = "output";
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this.version = "";
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var outputInstance = null;
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for (var i=0; (i<midiAccess._jazzInstances.length)&&(!outputInstance); i++) {
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if (!midiAccess._jazzInstances[i].outputInUse)
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outputInstance=midiAccess._jazzInstances[i];
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}
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if (!outputInstance) {
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outputInstance = new _JazzInstance();
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midiAccess._jazzInstances.push( outputInstance );
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}
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outputInstance.outputInUse = true;
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this._jazzInstance = outputInstance._Jazz;
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this._jazzInstance.MidiOutOpen(this.name);
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};
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function _sendLater() {
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this.jazz.MidiOutLong( this.data ); // handle send as sysex
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}
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MIDIOutput.prototype.send = function( data, timestamp ) {
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var delayBeforeSend = 0;
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if (data.length === 0)
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return false;
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if (timestamp)
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delayBeforeSend = Math.floor( timestamp - window.performance.now() );
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if (timestamp && (delayBeforeSend>1)) {
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var sendObj = new Object();
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sendObj.jazz = this._jazzInstance;
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sendObj.data = data;
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window.setTimeout( _sendLater.bind(sendObj), delayBeforeSend );
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} else {
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this._jazzInstance.MidiOutLong( data );
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}
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return true;
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};
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//init: create plugin
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if (!window.navigator.requestMIDIAccess)
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window.navigator.requestMIDIAccess = _requestMIDIAccess;
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}(window));
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// Polyfill window.performance.now() if necessary.
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(function (exports) {
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var perf = {}, props;
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function findAlt() {
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var prefix = ['moz', 'webkit', 'o', 'ms'],
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i = prefix.length,
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//worst case, we use Date.now()
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props = {
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value: (function (start) {
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return function () {
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return Date.now() - start;
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};
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}(Date.now()))
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};
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//seach for vendor prefixed version
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for (; i >= 0; i--) {
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if ((prefix[i] + "Now") in exports.performance) {
|
||
|
|
props.value = function (method) {
|
||
|
|
return function () {
|
||
|
|
exports.performance[method]();
|
||
|
|
}
|
||
|
|
}(prefix[i] + "Now");
|
||
|
|
return props;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
//otherwise, try to use connectionStart
|
||
|
|
if ("timing" in exports.performance && "connectStart" in exports.performance.timing) {
|
||
|
|
//this pretty much approximates performance.now() to the millisecond
|
||
|
|
props.value = (function (start) {
|
||
|
|
return function() {
|
||
|
|
Date.now() - start;
|
||
|
|
};
|
||
|
|
}(exports.performance.timing.connectStart));
|
||
|
|
}
|
||
|
|
return props;
|
||
|
|
}
|
||
|
|
|
||
|
|
//if already defined, bail
|
||
|
|
if (("performance" in exports) && ("now" in exports.performance))
|
||
|
|
return;
|
||
|
|
if (!("performance" in exports))
|
||
|
|
Object.defineProperty(exports, "performance", {
|
||
|
|
get: function () {
|
||
|
|
return perf;
|
||
|
|
}});
|
||
|
|
//otherwise, performance is there, but not "now()"
|
||
|
|
|
||
|
|
props = findAlt();
|
||
|
|
Object.defineProperty(exports.performance, "now", props);
|
||
|
|
}(window));
|