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Diffstat (limited to 'Processing-js/libs/inc/WebMIDIAPI.js')
| -rw-r--r-- | Processing-js/libs/inc/WebMIDIAPI.js | 421 |
1 files changed, 421 insertions, 0 deletions
diff --git a/Processing-js/libs/inc/WebMIDIAPI.js b/Processing-js/libs/inc/WebMIDIAPI.js new file mode 100644 index 0000000..2b3d6f2 --- /dev/null +++ b/Processing-js/libs/inc/WebMIDIAPI.js @@ -0,0 +1,421 @@ +/* Copyright 2013 Chris Wilson + + Licensed under the Apache License, Version 2.0 (the "License"); + you may not use this file except in compliance with the License. + You may obtain a copy of the License at + + http://www.apache.org/licenses/LICENSE-2.0 + + Unless required by applicable law or agreed to in writing, software + distributed under the License is distributed on an "AS IS" BASIS, + WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + See the License for the specific language governing permissions and + limitations under the License. + */ + +// Initialize the MIDI library. +(function (global) { + 'use strict'; + var midiIO, _requestMIDIAccess, MIDIAccess, _onReady, MIDIPort, MIDIInput, MIDIOutput, _midiProc; + + function Promise() { + + } + + Promise.prototype.then = function(accept, reject) { + this.accept = accept; + this.reject = reject; + } + + Promise.prototype.succeed = function(access) { + if (this.accept) + this.accept(access); + } + + Promise.prototype.fail = function(error) { + if (this.reject) + this.reject(error); + } + + function _JazzInstance() { + this.inputInUse = false; + this.outputInUse = false; + + // load the Jazz plugin + var o1 = document.createElement("object"); + o1.id = "_Jazz" + Math.random() + "ie"; + o1.classid = "CLSID:1ACE1618-1C7D-4561-AEE1-34842AA85E90"; + + this.activeX = o1; + + var o2 = document.createElement("object"); + o2.id = "_Jazz" + Math.random(); + o2.type="audio/x-jazz"; + o1.appendChild(o2); + + this.objRef = o2; + + var e = document.createElement("p"); + e.appendChild(document.createTextNode("This page requires the ")); + + var a = document.createElement("a"); + a.appendChild(document.createTextNode("Jazz plugin")); + a.href = "http://jazz-soft.net/"; + + e.appendChild(a); + e.appendChild(document.createTextNode(".")); + o2.appendChild(e); + + var insertionPoint = document.getElementById("MIDIPlugin"); + if (!insertionPoint) { + // Create hidden element + var insertionPoint = document.createElement("div"); + insertionPoint.id = "MIDIPlugin"; + insertionPoint.style.position = "absolute"; + insertionPoint.style.visibility = "hidden"; + insertionPoint.style.left = "-9999px"; + insertionPoint.style.top = "-9999px"; + document.body.appendChild(insertionPoint); + } + insertionPoint.appendChild(o1); + + if (this.objRef.isJazz) + this._Jazz = this.objRef; + else if (this.activeX.isJazz) + this._Jazz = this.activeX; + else + this._Jazz = null; + if (this._Jazz) { + this._Jazz._jazzTimeZero = this._Jazz.Time(); + this._Jazz._perfTimeZero = window.performance.now(); + } + } + + _requestMIDIAccess = function _requestMIDIAccess() { + var access = new MIDIAccess(); + return access._promise; + }; + + // API Methods + + function MIDIAccess() { + this._jazzInstances = new Array(); + this._jazzInstances.push( new _JazzInstance() ); + this._promise = new Promise; + + if (this._jazzInstances[0]._Jazz) { + this._Jazz = this._jazzInstances[0]._Jazz; + window.setTimeout( _onReady.bind(this), 3 ); + } else { + window.setTimeout( _onNotReady.bind(this), 3 ); + } + }; + + _onReady = function _onReady() { + if (this._promise) + this._promise.succeed(this); + }; + + function _onNotReady() { + if (this._promise) + this._promise.fail( { code: 1 } ); + }; + + MIDIAccess.prototype.inputs = function( ) { + if (!this._Jazz) + return null; + var list=this._Jazz.MidiInList(); + var inputs = new Array( list.length ); + + for ( var i=0; i<list.length; i++ ) { + inputs[i] = new MIDIInput( this, list[i], i ); + } + return inputs; + } + + MIDIAccess.prototype.outputs = function( ) { + if (!this._Jazz) + return null; + var list=this._Jazz.MidiOutList(); + var outputs = new Array( list.length ); + + for ( var i=0; i<list.length; i++ ) { + outputs[i] = new MIDIOutput( this, list[i], i ); + } + return outputs; + }; + + MIDIInput = function MIDIInput( midiAccess, name, index ) { + this._listeners = []; + this._midiAccess = midiAccess; + this._index = index; + this._inLongSysexMessage = false; + this._sysexBuffer = new Uint8Array(); + this.id = "" + index + "." + name; + this.manufacturer = ""; + this.name = name; + this.type = "input"; + this.version = ""; + this.onmidimessage = null; + + var inputInstance = null; + for (var i=0; (i<midiAccess._jazzInstances.length)&&(!inputInstance); i++) { + if (!midiAccess._jazzInstances[i].inputInUse) + inputInstance=midiAccess._jazzInstances[i]; + } + if (!inputInstance) { + inputInstance = new _JazzInstance(); + midiAccess._jazzInstances.push( inputInstance ); + } + inputInstance.inputInUse = true; + + this._jazzInstance = inputInstance._Jazz; + this._input = this._jazzInstance.MidiInOpen( this._index, _midiProc.bind(this) ); + }; + + // Introduced in DOM Level 2: + MIDIInput.prototype.addEventListener = function (type, listener, useCapture ) { + if (type !== "midimessage") + return; + for (var i=0; i<this._listeners.length; i++) + if (this._listeners[i] == listener) + return; + this._listeners.push( listener ); + }; + + MIDIInput.prototype.removeEventListener = function (type, listener, useCapture ) { + if (type !== "midimessage") + return; + for (var i=0; i<this._listeners.length; i++) + if (this._listeners[i] == listener) { + this._listeners.splice( i, 1 ); //remove it + return; + } + }; + + MIDIInput.prototype.preventDefault = function() { + this._pvtDef = true; + }; + + MIDIInput.prototype.dispatchEvent = function (evt) { + this._pvtDef = false; + + // dispatch to listeners + for (var i=0; i<this._listeners.length; i++) + if (this._listeners[i].handleEvent) + this._listeners[i].handleEvent.bind(this)( evt ); + else + this._listeners[i].bind(this)( evt ); + + if (this.onmidimessage) + this.onmidimessage( evt ); + + return this._pvtDef; + }; + + MIDIInput.prototype.appendToSysexBuffer = function ( data ) { + var oldLength = this._sysexBuffer.length; + var tmpBuffer = new Uint8Array( oldLength + data.length ); + tmpBuffer.set( this._sysexBuffer ); + tmpBuffer.set( data, oldLength ); + this._sysexBuffer = tmpBuffer; + }; + + MIDIInput.prototype.bufferLongSysex = function ( data, initialOffset ) { + var j = initialOffset; + while (j<data.length) { + if (data[j] == 0xF7) { + // end of sysex! + j++; + this.appendToSysexBuffer( data.slice(initialOffset, j) ); + return j; + } + j++; + } + // didn't reach the end; just tack it on. + this.appendToSysexBuffer( data.slice(initialOffset, j) ); + this._inLongSysexMessage = true; + return j; + }; + + _midiProc = function _midiProc( timestamp, data ) { + // Have to use createEvent/initEvent because IE10 fails on new CustomEvent. Thanks, IE! + var length = 0; + var i,j; + var isSysexMessage = false; + + // Jazz sometimes passes us multiple messages at once, so we need to parse them out + // and pass them one at a time. + + for (i=0; i<data.length; i+=length) { + if (this._inLongSysexMessage) { + i = this.bufferLongSysex(data,i); + if ( data[i-1] != 0xf7 ) { + // ran off the end without hitting the end of the sysex message + return; + } + isSysexMessage = true; + } else { + isSysexMessage = false; + switch (data[i] & 0xF0) { + case 0x80: // note off + case 0x90: // note on + case 0xA0: // polyphonic aftertouch + case 0xB0: // control change + case 0xE0: // channel mode + length = 3; + break; + + case 0xC0: // program change + case 0xD0: // channel aftertouch + length = 2; + break; + + case 0xF0: + switch (data[i]) { + case 0xf0: // variable-length sysex. + i = this.bufferLongSysex(data,i); + if ( data[i-1] != 0xf7 ) { + // ran off the end without hitting the end of the sysex message + return; + } + isSysexMessage = true; + break; + + case 0xF1: // MTC quarter frame + case 0xF3: // song select + length = 2; + break; + + case 0xF2: // song position pointer + length = 3; + break; + + default: + length = 1; + break; + } + break; + } + } + var evt = document.createEvent( "Event" ); + evt.initEvent( "midimessage", false, false ); + evt.receivedTime = parseFloat( timestamp.toString()) + this._jazzInstance._perfTimeZero; + if (isSysexMessage || this._inLongSysexMessage) { + evt.data = new Uint8Array( this._sysexBuffer ); + this._sysexBuffer = new Uint8Array(0); + this._inLongSysexMessage = false; + } else + evt.data = new Uint8Array(data.slice(i, length+i)); + this.dispatchEvent( evt ); + } + }; + + MIDIOutput = function MIDIOutput( midiAccess, name, index ) { + this._listeners = []; + this._midiAccess = midiAccess; + this._index = index; + this.id = "" + index + "." + name; + this.manufacturer = ""; + this.name = name; + this.type = "output"; + this.version = ""; + + var outputInstance = null; + for (var i=0; (i<midiAccess._jazzInstances.length)&&(!outputInstance); i++) { + if (!midiAccess._jazzInstances[i].outputInUse) + outputInstance=midiAccess._jazzInstances[i]; + } + if (!outputInstance) { + outputInstance = new _JazzInstance(); + midiAccess._jazzInstances.push( outputInstance ); + } + outputInstance.outputInUse = true; + + this._jazzInstance = outputInstance._Jazz; + this._jazzInstance.MidiOutOpen(this.name); + }; + + function _sendLater() { + this.jazz.MidiOutLong( this.data ); // handle send as sysex + } + + MIDIOutput.prototype.send = function( data, timestamp ) { + var delayBeforeSend = 0; + if (data.length === 0) + return false; + + if (timestamp) + delayBeforeSend = Math.floor( timestamp - window.performance.now() ); + + if (timestamp && (delayBeforeSend>1)) { + var sendObj = new Object(); + sendObj.jazz = this._jazzInstance; + sendObj.data = data; + + window.setTimeout( _sendLater.bind(sendObj), delayBeforeSend ); + } else { + this._jazzInstance.MidiOutLong( data ); + } + return true; + }; + + //init: create plugin + if (!window.navigator.requestMIDIAccess) + window.navigator.requestMIDIAccess = _requestMIDIAccess; + +}(window)); + +// Polyfill window.performance.now() if necessary. +(function (exports) { + var perf = {}, props; + + function findAlt() { + var prefix = ['moz', 'webkit', 'o', 'ms'], + i = prefix.length, + //worst case, we use Date.now() + props = { + value: (function (start) { + return function () { + return Date.now() - start; + }; + }(Date.now())) + }; + + //seach for vendor prefixed version + for (; i >= 0; i--) { + 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));
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