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<!DOCTYPE html> |
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<html lang="en"> |
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<head> |
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<meta charset="utf-8"> |
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<meta http-equiv="x-ua-compatible" content="ie=edge"> |
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<meta name="viewport" content="width=device-width, initial-scale=1"> |
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<link rel="stylesheet" href="examples-styles.css"/> |
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<link rel="icon" href="favicon.ico" type="image/x-icon"/> |
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<title>abcjs: Tempo Demo</title> |
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<script src="../dist/abcjs-basic.js" type="text/javascript"></script> |
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<script type="text/javascript"> |
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var abc = "T: Cooley's\n" + |
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"M: 4/4\n" + |
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"L: 1/8\n" + |
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"R: reel\n" + |
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"K: Emin\n" + |
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"|:D2|EB{c}BA B2 EB|~B2 AB dBAG|FDAD BDAD|FDAD dAFD|\n" + |
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"EBBA B2 EB|B2 AB defg|afe^c dBAF|DEFD E2:|\n" + |
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"|:gf|eB B2 efge|eB B2 gedB|A2 FA DAFA|A2 FA defg|\n" + |
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"eB B2 eBgB|eB B2 defg|afe^c dBAF|DEFD E2:|"; |
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var abcQ = "T: Cooley's\n" + |
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"M: 4/4\n" + |
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"L: 1/8\n" + |
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"R: reel\n" + |
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"Q: 1/4=150\n" + |
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"K: Emin\n" + |
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"|:D2|EB{c}BA B2 EB|~B2 AB dBAG|FDAD BDAD|FDAD dAFD|\n" + |
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"EBBA B2 EB|B2 AB defg|afe^c dBAF|DEFD E2:|\n" + |
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"|:gf|eB B2 efge|eB B2 gedB|A2 FA DAFA|A2 FA defg|\n" + |
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"eB B2 eBgB|eB B2 defg|afe^c dBAF|DEFD E2:|"; |
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function load() { |
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var visualObjQ = ABCJS.renderAbc("paper-q", abcQ, { |
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responsive: "resize" })[0]; |
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var visualObjP = ABCJS.renderAbc("paper-param", abcQ, { |
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responsive: "resize" })[0]; |
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var visualObjD = ABCJS.renderAbc("paper-default", abc, { |
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responsive: "resize" })[0]; |
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var visualObjDQ = ABCJS.renderAbc("paper-default-q", abcQ, { |
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responsive: "resize" })[0]; |
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var visualObjs = { |
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q: visualObjQ, |
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param: visualObjP, |
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default: visualObjD, |
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defaultQ: visualObjDQ, |
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} |
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var options = { |
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q: { visualObj: visualObjQ }, |
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param: { visualObj: visualObjP, options: { qpm: 100 } }, |
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default: { visualObj: visualObjD, options: { defaultQpm: 60 } }, |
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defaultQ: { visualObj: visualObjDQ, options: { defaultQpm: 60 } }, |
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} |
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var midiBuffer; |
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var startAudioButton = document.querySelectorAll(".activate-audio"); |
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var stopAudioButton = document.querySelectorAll(".stop-audio"); |
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for (var i = 0; i < startAudioButton.length; i++) { |
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startAudioButton[i].addEventListener("click", startAudio); |
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} |
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for (i = 0; i < stopAudioButton.length; i++) { |
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stopAudioButton[i].addEventListener("click", stopAudio); |
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} |
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function startAudio() { |
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var type = this.dataset.type; |
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this.setAttribute("style", "display:none;"); |
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if (ABCJS.synth.supportsAudio()) { |
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var stopButton = document.querySelector('.stop-audio[data-type="' + type + '"]'); |
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stopButton.setAttribute("style", ""); |
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window.AudioContext = window.AudioContext || |
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window.webkitAudioContext || |
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navigator.mozAudioContext || |
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navigator.msAudioContext; |
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var audioContext = new window.AudioContext(); |
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audioContext.resume().then(function () { |
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midiBuffer = new ABCJS.synth.CreateSynth(); |
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options[type].audioContext = audioContext; |
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return midiBuffer.init(options[type]).then(function (response) { |
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return midiBuffer.prime(); |
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}).then(function () { |
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midiBuffer.start(); |
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return Promise.resolve(); |
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}).catch(function (error) { |
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if (error.status === "NotSupported") { |
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stopButton.setAttribute("style", "display:none;"); |
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var audioError = document.querySelector(".audio-error"); |
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audioError.setAttribute("style", ""); |
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} else |
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console.warn("synth error", error); |
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}); |
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}); |
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} else { |
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var audioError = document.querySelector(".audio-error"); |
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audioError.setAttribute("style", ""); |
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} |
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} |
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function stopAudio() { |
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var type = this.dataset.type; |
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var startButton = document.querySelector('.activate-audio[data-type="' + type + '"]'); |
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startButton.setAttribute("style", ""); |
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this.setAttribute("style", "display:none;"); |
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if (midiBuffer) |
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midiBuffer.stop(); |
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} |
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} |
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</script> |
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</head> |
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<body onload="load()"> |
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<main> |
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<header> |
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<img src="https://paulrosen.github.io/abcjs/img/abcjs_comp_extended_08.svg" alt="abcjs logo"> |
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<h1>Tempo</h1> |
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</header> |
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<div class="container"> |
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<p>Tempo can be set in various ways: it can be specified in the ABC string, it can be specified in the |
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parameters passed in, or a default can be set that is only used if the tempo is not in the string. |
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</p> |
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<div class='audio-error' style="display:none;">Audio is not supported in this browser.</div> |
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<h2>Specified in the ABC String</h2> |
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<p>The tempo is set using the <span class="code">Q: 1/4=150</span> line.</p> |
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<div id="paper-q"></div> |
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<div class="row"> |
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<div> |
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<button class="activate-audio" data-type="q">Activate Audio Context And Play</button> |
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<button class="stop-audio" data-type="q" style="display:none;">Stop Audio</button> |
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</div> |
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</div> |
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<h2>Passed in as a Parameter</h2> |
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<p>The tempo is set using the <span class="code">{ qpm: 100 }</span> attribute. Notice that this overrides the tempo in the <span class="code">Q:</span> line.</p> |
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<div id="paper-param"></div> |
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<div class="row"> |
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<div> |
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<button class="activate-audio" data-type="param">Activate Audio Context And Play</button> |
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<button class="stop-audio" data-type="param" style="display:none;">Stop Audio</button> |
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</div> |
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</div> |
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<h2>Using a default</h2> |
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<p>The tempo is set using the <span class="code">{ defaultQpm: 60 }</span> attribute. Notice there is no <span class="code">Q:</span> line.</p> |
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<div id="paper-default"></div> |
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<div class="row"> |
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<div> |
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<button class="activate-audio" data-type="default">Activate Audio Context And Play</button> |
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<button class="stop-audio" data-type="default" style="display:none;">Stop Audio</button> |
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</div> |
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</div> |
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<p>The tempo is set using the <span class="code">{ defaultQpm: 60 }</span> attribute. However, there is a <span class="code">Q:</span> line, so that takes precedence.</p> |
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<div id="paper-default-q"></div> |
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<div class="row"> |
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<div> |
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<button class="activate-audio" data-type="defaultQ">Activate Audio Context And Play</button> |
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<button class="stop-audio" data-type="defaultQ" style="display:none;">Stop Audio</button> |
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</div> |
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</div> |
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</div> |
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</main> |
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</body> |
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</html> |
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