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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: Modify Synth Input 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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.abcjs-cursor { |
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stroke: red; |
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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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"%%barnumbers 1\n" + |
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"M: 4/4\n" + |
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"L: 1/8\n" + |
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"Q: 1/4=120\n" + |
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"R: reel\n" + |
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"K: Emin\n" + |
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"EBBA 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 gf|\n" + |
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"|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 D2||"; |
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var synth = new ABCJS.synth.CreateSynth(); |
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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 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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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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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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synth.init({ |
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audioContext: audioContext, |
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visualObj: visualObj, |
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options: { |
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sequenceCallback: sequenceCallback |
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} |
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}).then(function () { |
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synth.prime().then(function () { |
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synth.start(); |
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}); |
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}).catch(function (error) { |
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console.log("Audio Failed", 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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synth.stop(); |
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}); |
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function sequenceCallback(tracks) { |
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var swing = 0.1 - 0.1 / document.getElementById("swing").value; |
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document.getElementById("coefficient").innerText = swing; |
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var track = tracks[0]; |
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for (var i = 0; i < track.length; i++) { |
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var event = track[i]; |
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if (event.start % 0.25) { |
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event.start += swing; |
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} else { |
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event.end += swing; |
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} |
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} |
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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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<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>Modify Synth Input</h1> |
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</header> |
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<div class="container"> |
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<main> |
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<p>Demonstration of changing the synth on the fly if you want to make adjustments.</p> |
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<p>This example adds some "swing" to the tune.</p> |
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<p><label>Amount of swing (1 to 6): <input id="swing" type="number" min="1" max="6" value="2"></label></p> |
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<p><label>Calculated swing coefficient:</label> <code id="coefficient">??</code></p> |
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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 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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<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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</main> |
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</div> |
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</body> |
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</html> |
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