mirror of
https://github.com/Tonejs/Tone.js
synced 2024-11-16 16:48:00 +00:00
700 lines
19 KiB
JavaScript
700 lines
19 KiB
JavaScript
define(["Tone/core/Tone", "Tone/core/Master", "Tone/signal/Signal"],
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function(Tone){
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/**
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* oscillator-based transport allows for simple musical timing
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* supports tempo curves and time changes
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*
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* @constructor
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*/
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Tone.Transport = function(){
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/** @type {Tone.Signal} */
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this.controlSignal = new Tone.Signal();
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this.oscillator = null;
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this.jsNode = this.context.createScriptProcessor(this.bufferSize, 1, 1);
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this.jsNode.onaudioprocess = this._processBuffer.bind(this);
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/** @type {boolean} */
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this.loop = false;
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//so it doesn't get garbage collected
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this.jsNode.toMaster();
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};
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Tone.extend(Tone.Transport);
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/** @private @type {number} */
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var transportTicks = 0;
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/** @private @type {number} */
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var tatum = 12;
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/** @private @type {boolean} */
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var upTick = false;
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/** @private @type {number} */
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var timeSignature = 4;
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/** @private @type {number} */
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var bpm = 120;
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/** @private @type {number} */
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var loopStart = 0;
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/** @private @type {number} */
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var loopEnd = tatum * 4;
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/** @private @type {Array<TimelineEvent>} */
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var intervals = [];
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/** @private @type {Array<TimelineEvent>} */
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var timeouts = [];
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/** @private @type {Array<TimelineEvent>} */
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var timeline = [];
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/** @private @type {number} */
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var timelineProgress = 0;
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/**
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* All of the synced components
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* @private @type {Array<Tone>}
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*/
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var SyncedComponents = [];
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///////////////////////////////////////////////////////////////////////////////
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// JS NODE PROCESSING
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///////////////////////////////////////////////////////////////////////////////
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/**
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* called when a buffer is ready
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*
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* @param {AudioProcessingEvent} event
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*/
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Tone.Transport.prototype._processBuffer = function(event){
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var now = this.defaultArg(event.playbackTime, this.now());
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var bufferSize = this.jsNode.bufferSize;
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var incomingBuffer = event.inputBuffer.getChannelData(0);
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for (var i = 0; i < bufferSize; i++){
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var sample = incomingBuffer[i];
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if (sample > 0 && !upTick){
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upTick = true;
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this._processTick(now + this.samplesToSeconds(i));
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} else if (sample < 0 && upTick){
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upTick = false;
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}
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}
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};
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//@param {number} tickTime
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Tone.Transport.prototype._processTick = function(tickTime){
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//do the looping stuff
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//do the intervals
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processIntervals(tickTime);
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processTimeouts(tickTime);
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processTimeline(tickTime);
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transportTicks = transportTicks + 1;
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if (this.loop){
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if (transportTicks === loopEnd){
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this._setTicks(this.loopEnd);
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}
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}
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};
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//jump to a specific tick in the timeline
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Tone.Transport.prototype._setTicks = function(ticks){
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transportTicks = ticks;
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for (var i = 0; i < this._timeouts.length; i++){
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var timeout = this._timeouts[i];
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if (timeout.callbackTick() >= ticks){
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this._timeoutProgress = i;
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break;
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}
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}
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};
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///////////////////////////////////////////////////////////////////////////////
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// EVENT PROCESSING
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///////////////////////////////////////////////////////////////////////////////
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/**
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* process the intervals
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* @param {number} ticks
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* @param {number} time
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*/
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var processIntervals = function(time){
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for (var i = 0, len = intervals.length; i<len; i++){
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var interval = intervals[i];
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if (interval.testInterval(transportTicks)){
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interval.doCallback(time);
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}
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}
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};
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/**
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* process the timeouts
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* @param {number} ticks
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* @param {number} time
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*/
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var processTimeouts = function(time){
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var removeTimeouts = 0;
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for (var i = 0, len = timeouts.length; i<len; i++){
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var timeout = timeouts[i];
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var callbackTick = timeout.callbackTick();
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if (callbackTick === transportTicks){
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timeout.doCallback(time);
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removeTimeouts++;
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} else if (callbackTick > transportTicks){
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break;
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}
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}
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//remove the timeouts off the front of the array after they've been called
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timeouts.splice(0, removeTimeouts);
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};
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/**
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* process the timeline events
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* @param {number} ticks
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* @param {number} time
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*/
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var processTimeline = function(time){
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for (var i = timelineProgress, len = timeline.length; i<len; i++){
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var evnt = timeline[i];
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var callbackTick = evnt.callbackTick();
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if (callbackTick === transportTicks){
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evnt.doCallback(time);
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timelineProgress = i;
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} else if (callbackTick > transportTicks){
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break;
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}
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}
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};
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///////////////////////////////////////////////////////////////////////////////
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// INTERVAL
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///////////////////////////////////////////////////////////////////////////////
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/**
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* intervals are recurring events
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*
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* @param {function} callback
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* @param {Tone.Time} interval
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* @param {Object} ctx the context the function is invoked in
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* @return {number} the id of the interval
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*/
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Tone.Transport.prototype.setInterval = function(callback, interval, ctx){
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var tickTime = this.toTicks(interval);
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var timeout = new TimelineEvent(callback, ctx, tickTime, transportTicks);
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intervals.push(timeout);
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return timeout.id;
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};
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/**
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* clear an interval from the processing array
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* @param {number} rmInterval the interval to remove
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* @return {boolean} true if the event was removed
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*/
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Tone.Transport.prototype.clearInterval = function(rmInterval){
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for (var i = 0; i < intervals.length; i++){
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var interval = intervals[i];
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if (interval.id === rmInterval){
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intervals.splice(i, 1);
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return true;
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}
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}
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return false;
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};
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///////////////////////////////////////////////////////////////////////////////
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// TIMEOUT
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///////////////////////////////////////////////////////////////////////////////
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/**
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* set a timeout to occur after time from now
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*
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* @param {function} callback
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* @param {Tone.Time} time
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* @param {Object} ctx the context to invoke the callback in
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* @return {number} the id of the timeout for clearing timeouts
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*/
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Tone.Transport.prototype.setTimeout = function(callback, time, ctx){
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var ticks = this.toTicks(time);
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var timeout = new TimelineEvent(callback, ctx, ticks + transportTicks, 0);
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//put it in the right spot
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for (var i = 0, len = timeouts.length; i<len; i++){
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var testEvnt = timeouts[i];
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if (testEvnt.callbackTick() > timeout.callbackTick()){
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timeouts.splice(i, 0, timeout);
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return timeout.id;
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}
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}
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//otherwise push it on the end
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timeouts.push(timeout);
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return timeout.id;
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};
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/**
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* clear the timeout based on it's ID
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* @param {number} timeoutID
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* @return {boolean} true if the timeout was removed
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*/
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Tone.Transport.prototype.clearTimeout = function(timeoutID){
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for (var i = 0; i < timeouts.length; i++){
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var testTimeout = timeouts[i];
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if (testTimeout.id === timeoutID){
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timeouts.splice(i, 1);
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return true;
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}
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}
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return false;
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};
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///////////////////////////////////////////////////////////////////////////////
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// TIMELINE
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///////////////////////////////////////////////////////////////////////////////
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/**
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* Timeline events are synced to the timeline of the Transport
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* Unlike Timeout, Timeline events will restart after the
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* Transport has been stopped and restarted.
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*
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*
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* @param {function} callback
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* @param {Tome.Time} timeout
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* @param {Object} ctx the context in which the funtion is called
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* @return {number} the id for clearing the timeline event
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*/
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Tone.Transport.prototype.setTimeline = function(callback, timeout, ctx){
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var ticks = this.toTicks(timeout);
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ctx = this.defaultArg(ctx, window);
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var timelineEvnt = new TimelineEvent(callback, ctx, ticks + transportTicks, 0);
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//put it in the right spot
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for (var i = timelineProgress, len = timeline.length; i<len; i++){
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var testEvnt = timeline[i];
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if (testEvnt.callbackTick() > timelineEvnt.callbackTick()){
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timeline.splice(i, 0, timelineEvnt);
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return timelineEvnt.id;
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}
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}
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//otherwise push it on the end
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timeline.push(event);
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return timelineEvnt.id;
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};
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/**
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* clear the timeline event from the
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* @param {number} timelineID
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* @return {boolean} true if it was removed
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*/
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Tone.Transport.prototype.clearTimeline = function(timelineID){
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for (var i = 0; i < timeline.length; i++){
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var testTimeline = timeline[i];
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if (testTimeline.id === timelineID){
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timeline.splice(i, 1);
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return true;
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}
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}
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return false;
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};
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///////////////////////////////////////////////////////////////////////////////
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// TIME CONVERSIONS
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///////////////////////////////////////////////////////////////////////////////
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/**
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* turns the time into
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* @param {Tone.Time} time
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* @return {number}
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*/
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Tone.Transport.prototype.toTicks = function(time){
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//get the seconds
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var seconds = this.toSeconds(time);
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var quarter = this.notationToSeconds("4n");
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var quarters = seconds / quarter;
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var tickNum = quarters * tatum;
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//quantize to tick value
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return Math.round(tickNum);
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};
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//@param {number} ticks
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//@returns {string} progress (measures:beats:sixteenths)
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Tone.Transport.prototype.ticksToTransportTime = function(ticks){
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var quarters = ticks / tatum;
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var measures = Math.floor(quarters / timeSignature);
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var sixteenths = Math.floor((quarters % 1) * 4, 10);
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quarters = Math.floor(quarters, 10) % timeSignature;
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var progress = [measures, quarters, sixteenths];
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return progress.join(":");
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};
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//@returns {string} progress (measures:beats:sixteenths)
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Tone.Transport.prototype.getTransportTime = function(){
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return this.ticksToTransportTime(transportTicks);
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};
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//jump to a specific measure
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//@param {string} progress
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Tone.Transport.prototype.setTransportTime = function(progress){
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var ticks = this.toTicks(progress);
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this._setTicks(ticks);
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};
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///////////////////////////////////////////////////////////////////////////////
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// START/STOP/PAUSE
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///////////////////////////////////////////////////////////////////////////////
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/**
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* start the transport and all sources synced to the transport
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*
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* @param {Tone.Time} time
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*/
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Tone.Transport.prototype.start = function(time){
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upTick = false;
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//reset the oscillator
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this.oscillator = this.context.createOscillator();
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this.oscillator.type = "square";
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//connect it up
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this.oscillator.connect(this.jsNode);
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this.controlSignal.connect(this.oscillator.frequency);
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this.oscillator.frequency.value = 0;
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//set the bpm
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this.setBpm(bpm);
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this.oscillator.start(this.toSeconds(time));
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//call start on each of the synced sources
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};
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/**
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* stop the transport and all sources synced to the transport
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*
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* @param {Tone.Time} time
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*/
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Tone.Transport.prototype.stop = function(time){
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this.oscillator.stop(this.toSeconds(time));
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this.oscillator = null;
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this._setTicks(0);
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//call stop on each of the synced sources
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};
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/**
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* pause the transport and all sources synced to the transport
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*
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* @param {Tone.Time} time
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*/
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Tone.Transport.prototype.pause = function(time){
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this.oscillator.stop(this.toSeconds(time));
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this.oscillator = null;
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//call pause on each of the synced sources
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};
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///////////////////////////////////////////////////////////////////////////////
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// SETTERS/GETTERS
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///////////////////////////////////////////////////////////////////////////////
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/**
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* set the BPM
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* optionally ramp to the bpm over some time
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* @param {number} newBpm
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* @param {Tone.Time=} rampTime
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*/
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Tone.Transport.prototype.setBpm = function(newBpm, rampTime){
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bpm = newBpm;
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if (this.oscillator !== null){
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//convert the bpm to frequency
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var tatumFreq = this.toFrequency(tatum.toString() + "n", bpm, timeSignature);
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var freqVal = 4 * tatumFreq;
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if (!rampTime){
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this.oscillator.frequency.value = freqVal;
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} else {
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this.exponentialRampToValueNow(this.oscillator.frequency, freqVal, rampTime);
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}
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}
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};
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/**
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* return the current BPM
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*
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* @return {number}
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*/
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Tone.Transport.prototype.getBpm = function(){
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//if the oscillator isn't running, return _bpm
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if (this.oscillator !== null){
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//convert the current frequency of the oscillator to bpm
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var freq = this.oscillator.frequency.value;
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return 60 * (freq / tatum);
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} else {
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return bpm;
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}
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};
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/**
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* set the time signature
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*
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* @example
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* this.setTimeSignature(4); //for 4/4
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*
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* @param {number} numerator
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* @param {number=} denominator defaults to 4
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*/
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Tone.Transport.prototype.setTimeSignature = function(numerator, denominator){
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denominator = this.defaultArg(denominator, 4);
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timeSignature = numerator / (denominator / 4);
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};
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/**
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* return the time signature as just the numerator
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* over 4 is assumed.
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* for example 4/4 would return 4 and 6/8 would return 3
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*
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* @return {number}
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*/
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Tone.Transport.prototype.getTimeSignature = function(){
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return timeSignature;
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};
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/**
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* set the loop start position
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*
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* @param {Tone.Time} startPosition
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*/
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Tone.Transport.prototype.setLoopStart = function(startPosition){
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loopStart = this.toTicks(startPosition);
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};
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/**
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* set the loop start position
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*
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* @param {Tone.Time} endPosition
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*/
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Tone.Transport.prototype.setLoopEnd = function(endPosition){
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loopEnd = this.toTicks(endPosition);
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};
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/**
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* shorthand loop setting
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* @param {Tone.Time} startPosition
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* @param {Tone.Time} endPosition
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*/
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Tone.Transport.prototype.setLoopPoint = function(startPosition, endPosition){
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this.setLoopStart(startPosition);
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this.setLoopEnd(endPosition);
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};
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///////////////////////////////////////////////////////////////////////////////
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// SYNCING
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///////////////////////////////////////////////////////////////////////////////
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Tone.Transport.prototype.sync = function(source, controlSignal){
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//create a gain node, attach it to the control signal
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// var ratio = new Tone.Multiply();
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// controlSignal.connect(ratio);
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// return ratio;
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};
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/**
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* remove the source from the list of Synced Sources
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*
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* @param {[type]} source [description]
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* @return {[type]} [description]
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*/
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Tone.Transport.prototype.unsync = function(source){
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};
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///////////////////////////////////////////////////////////////////////////////
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// TIMELINE EVENT
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///////////////////////////////////////////////////////////////////////////////
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/**
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* @static
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* @type {number}
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*/
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var TimelineEventIDCounter = 0;
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/**
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* A Timeline event
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*
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* @constructor
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* @param {function(number)} callback
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* @param {Object} context
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* @param {number} tickTime
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* @param {number} startTicks
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*/
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var TimelineEvent = function(callback, context, tickTime, startTicks){
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this.startTicks = startTicks;
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this.tickTime = tickTime;
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this.callback = callback;
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this.context = context;
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this.id = TimelineEventIDCounter++;
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};
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/**
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* invoke the callback in the correct context
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* passes in the playback time
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*
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* @param {number} playbackTime
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*/
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TimelineEvent.prototype.doCallback = function(playbackTime){
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this.callback.call(this.context, playbackTime);
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};
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/**
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* get the tick which the callback is supposed to occur on
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*
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* @return {number}
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*/
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TimelineEvent.prototype.callbackTick = function(){
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return this.startTicks + this.tickTime;
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};
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/**
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* test if the tick occurs on the interval
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*
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* @param {number} tick
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* @return {boolean}
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*/
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TimelineEvent.prototype.testInterval = function(tick){
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return (tick - this.startTicks) % this.tickTime === 0;
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};
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//a single transport object
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Tone.Transport = new Tone.Transport();
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///////////////////////////////////////////////////////////////////////////////
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// AUGMENT TONE'S PROTOTYPE TO INCLUDE TRANSPORT TIMING
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///////////////////////////////////////////////////////////////////////////////
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/**
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* tests if a string is musical notation
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* i.e.:
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* 4n = quarter note
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* 2m = two measures
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* 8t = eighth-note triplet
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*
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* @return {boolean}
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*/
|
|
Tone.prototype.isNotation = (function(){
|
|
var notationFormat = new RegExp(/[0-9]+[mnt]$/i);
|
|
return function(note){
|
|
return notationFormat.test(note);
|
|
};
|
|
})();
|
|
|
|
/**
|
|
* tests if a string is transportTime
|
|
* i.e. :
|
|
* 1:2:0 = 1 measure + two quarter notes + 0 sixteenth notes
|
|
*
|
|
* @return {boolean}
|
|
*/
|
|
Tone.prototype.isTransportTime = (function(){
|
|
var transportTimeFormat = new RegExp(/^\d+(\.\d+)?:\d+(\.\d+)?(:\d+(\.\d+)?)?$/);
|
|
return function(transportTime){
|
|
return transportTimeFormat.test(transportTime);
|
|
};
|
|
})();
|
|
|
|
/**
|
|
* convert notation format strings to seconds
|
|
* @param {string} notation
|
|
* @return {number}
|
|
*/
|
|
Tone.prototype.notationToSeconds = function(notation){
|
|
bpm = Tone.Transport.getBpm();
|
|
var beatTime = (60 / bpm);
|
|
var subdivision = parseInt(notation, 10);
|
|
var beats = 0;
|
|
if (subdivision === 0){
|
|
beats = 0;
|
|
}
|
|
var lastLetter = notation.slice(-1);
|
|
if (lastLetter === "t"){
|
|
beats = (4 / subdivision) * 2/3;
|
|
} else if (lastLetter === "n"){
|
|
beats = 4 / subdivision;
|
|
} else if (lastLetter === "m"){
|
|
beats = subdivision * timeSignature;
|
|
} else {
|
|
beats = 0;
|
|
}
|
|
return beatTime * beats;
|
|
};
|
|
|
|
/**
|
|
* convert transportTime into seconds
|
|
* i.e.:
|
|
* 4:2:3 == 4 measures + 2 quarters + 3 sixteenths
|
|
*
|
|
* @param {string} transportTime
|
|
* @return {number} seconds
|
|
*/
|
|
Tone.prototype.transportTimeToSeconds = function(transportTime){
|
|
bpm = Tone.Transport.getBpm();
|
|
var measures = 0;
|
|
var quarters = 0;
|
|
var sixteenths = 0;
|
|
var split = transportTime.split(":");
|
|
if (split.length === 2){
|
|
measures = parseFloat(split[0]);
|
|
quarters = parseFloat(split[1]);
|
|
} else if (split.length === 1){
|
|
quarters = parseFloat(split[0]);
|
|
} else if (split.length === 3){
|
|
measures = parseFloat(split[0]);
|
|
quarters = parseFloat(split[1]);
|
|
sixteenths = parseFloat(split[2]);
|
|
}
|
|
var beats = (measures * timeSignature + quarters + sixteenths / 4);
|
|
return beats * this.notationToSeconds("4n", bpm, timeSignature);
|
|
};
|
|
|
|
/**
|
|
* Convert seconds to the closest transportTime in the form
|
|
* measures:quarters:sixteenths
|
|
*
|
|
* @param {number} seconds
|
|
* @return {string}
|
|
*/
|
|
Tone.prototype.secondsToTransportTime = function(seconds){
|
|
bpm = Tone.Transport.getBpm();
|
|
var quarterTime = this.notationToSeconds("4n", bpm, timeSignature);
|
|
var quarters = seconds / quarterTime;
|
|
var measures = Math.floor(quarters / timeSignature);
|
|
var sixteenths = Math.floor((quarters % 1) * 4);
|
|
quarters = Math.floor(quarters) % timeSignature;
|
|
var progress = [measures, quarters, sixteenths];
|
|
return progress.join(":");
|
|
};
|
|
|
|
|
|
/**
|
|
* convert Tone.Time into seconds
|
|
*
|
|
* unlike the method which it overrides, this takes into account
|
|
* transporttime and musical notation
|
|
*
|
|
* @param {Tone.Time} time
|
|
*/
|
|
Tone.prototype.toSeconds = function(time){
|
|
if (typeof time === "number"){
|
|
return time; //assuming that it's seconds
|
|
} else if (typeof time === "string"){
|
|
var plusTime = 0;
|
|
if(time.charAt(0) === "+") {
|
|
plusTime = this.now();
|
|
time = time.slice(1);
|
|
}
|
|
if (this.isNotation(time)){
|
|
time = this.notationToSeconds(time);
|
|
} else if (this.isTransportTime(time)){
|
|
time = this.transportTimeToSeconds(time);
|
|
} else if (this.isFrequency(time)){
|
|
time = this.frequencyToSeconds(time);
|
|
}
|
|
return parseFloat(time) + plusTime;
|
|
} else {
|
|
return this.now();
|
|
}
|
|
};
|
|
|
|
return Tone.Transport;
|
|
});
|