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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: Basic Synth Demo</title> |
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<style> |
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main { |
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max-width: 770px; |
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margin: 0 auto; |
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} |
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.row { |
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display: flex; |
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justify-content: space-between; |
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align-items: flex-start; |
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} |
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.status { |
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padding: 2px 10px 10px 10px; |
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background-color: #f0f0f0; |
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width:250px; |
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} |
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@media (prefers-color-scheme: dark) { |
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.status { |
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background-color: #000000; |
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} |
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} |
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</style> |
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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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function load() { |
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var visualObj = ABCJS.renderAbc("paper", abc, { |
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responsive: "resize" })[0]; |
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var midiBuffer; |
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var startAudioButton = document.querySelector(".activate-audio"); |
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var stopAudioButton = document.querySelector(".stop-audio"); |
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var explanationDiv = document.querySelector(".suspend-explanation"); |
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var statusDiv = document.querySelector(".status"); |
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startAudioButton.addEventListener("click", function() { |
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startAudioButton.setAttribute("style", "display:none;"); |
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explanationDiv.setAttribute("style", "opacity: 0;"); |
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statusDiv.innerHTML = "<div>Testing browser</div>"; |
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if (ABCJS.synth.supportsAudio()) { |
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stopAudioButton.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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statusDiv.innerHTML += "<div>AudioContext resumed</div>"; |
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midiBuffer = new ABCJS.synth.CreateSynth(); |
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return midiBuffer.init({ |
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visualObj: visualObj, |
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audioContext: audioContext, |
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millisecondsPerMeasure: visualObj.millisecondsPerMeasure() |
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}).then(function (response) { |
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console.log("Notes loaded: ", response) |
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statusDiv.innerHTML += "<div>Audio object has been initialized</div>"; |
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return midiBuffer.prime(); |
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}).then(function (response) { |
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statusDiv.innerHTML += "<div>Audio object has been primed (" + response.duration + " seconds).</div>"; |
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statusDiv.innerHTML += "<div>status = " + response.status + "</div>" |
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midiBuffer.start(); |
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statusDiv.innerHTML += "<div>Audio started</div>"; |
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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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stopAudioButton.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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stopAudioButton.addEventListener("click", function() { |
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startAudioButton.setAttribute("style", ""); |
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explanationDiv.setAttribute("style", ""); |
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stopAudioButton.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>Basic Synth</h1> |
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</header> |
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<div class="container"> |
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<div id="paper"></div> |
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<p class="suspend-explanation">Browsers won't allow audio to work unless the audio is started in response to a |
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user action. This prevents auto-playing web sites. Therefore, the |
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following button is needed to do the initialization:</p> |
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<div class="row"> |
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<div> |
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<button class="activate-audio">Activate Audio Context And Play</button> |
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<button class="stop-audio" style="display:none;">Stop Audio</button> |
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<div class='audio-error' style="display:none;">Audio is not supported in this browser.</div> |
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</div> |
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<div class="status"></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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