Created
September 9, 2017 17:25
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Audio crossfade example with Web Audio API
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| <!DOCTYPE html> | |
| <html lang="en"> | |
| <head> | |
| <meta charset="UTF-8"> | |
| <meta name="viewport" content="width=device-width, initial-scale=1.0"> | |
| <meta http-equiv="X-UA-Compatible" content="ie=edge"> | |
| <title>Crossfade Demo</title> | |
| <style> | |
| html, body { | |
| margin: 0; | |
| padding: 0; | |
| width: 100%; | |
| height: 100%; | |
| } | |
| .background { | |
| width: 100%; | |
| height: 100%; | |
| position: relative; | |
| } | |
| .background > .artwork { | |
| width: 100%; | |
| height: 100%; | |
| position: absolute; | |
| top: 0; | |
| left: 0; | |
| background-repeat: no-repeat; | |
| background-size: cover; | |
| } | |
| </style> | |
| </head> | |
| <body> | |
| <div class="background"> | |
| <div class="artwork" id="artwork-1" style="background-image: url(1.jpg)"></div> | |
| <div class="artwork" id="artwork-2" style="background-image: url(2.jpg)"></div> | |
| <audio id="audio-1" src="1.m4a" preload="metadata"></audio> | |
| <audio id="audio-2" src="2.m4a" preload="metadata"></audio> | |
| </div> | |
| <script> | |
| window.onload = () => { | |
| const audioCtx = new AudioContext(); | |
| const art1Elem = document.getElementById("artwork-1"); | |
| const art2Elem = document.getElementById("artwork-2"); | |
| const audio1Elem = document.getElementById("audio-1"); | |
| const audio2Elem = document.getElementById("audio-2"); | |
| const src1= audioCtx.createMediaElementSource(audio1Elem); | |
| const src2 = audioCtx.createMediaElementSource(audio2Elem); | |
| const gain1 = audioCtx.createGain(); | |
| const gain2 = audioCtx.createGain(); | |
| src1.connect(gain1); | |
| gain1.connect(audioCtx.destination); | |
| src2.connect(gain2); | |
| gain2.connect(audioCtx.destination); | |
| document.onmousemove = (e) => { | |
| var x = e.clientX / document.body.clientWidth; | |
| var gainL = Math.cos(x * 0.5 * Math.PI); | |
| var gainR = Math.cos((1.0 - x) * 0.5 * Math.PI); | |
| gain1.gain.value = gainL; | |
| gain2.gain.value = gainR; | |
| art1Elem.style.opacity = gainL; | |
| art2Elem.style.opacity = gainR; | |
| console.log("[GAIN]L: %.2f R: %.2f", gainL, gainR); | |
| } | |
| // play!! | |
| audio1Elem.play(); | |
| audio2Elem.play(); | |
| } | |
| </script> | |
| </body> | |
| </html> | |
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