mirror of
https://github.com/osmarks/random-stuff
synced 2024-11-08 13:39:53 +00:00
69 lines
2.7 KiB
HTML
69 lines
2.7 KiB
HTML
|
<!DOCTYPE html>
|
||
|
|
<input type="text" id="text">
|
||
|
|
<button id="send">do thing</button>
|
||
|
|
<button id="recv">do thing 2</button>
|
||
|
|
<canvas id="vis" style="width: 100%; height: 20em; "></canvas>
|
||
|
|
<script>
|
||
|
|
const ctx = new AudioContext()
|
||
|
|
const encoder = new TextEncoder()
|
||
|
|
const visCanvas = document.querySelector("#vis")
|
||
|
|
const transmit = bytes => {
|
||
|
|
const tones = Array.from(bytes).flatMap(x => [x >> 6, x >> 4 & 3, x >> 2 & 3, x & 3])
|
||
|
|
console.log(tones)
|
||
|
|
let pos = 0
|
||
|
|
const oscillator = ctx.createOscillator()
|
||
|
|
oscillator.connect(ctx.destination)
|
||
|
|
oscillator.start()
|
||
|
|
const interval = setInterval(() => {
|
||
|
|
const tone = tones[pos]
|
||
|
|
oscillator.frequency.value = [200, 400, 600, 800][tone]
|
||
|
|
pos++
|
||
|
|
if (pos == tones.length) {
|
||
|
|
oscillator.stop()
|
||
|
|
oscillator.disconnect()
|
||
|
|
clearInterval(interval)
|
||
|
|
}
|
||
|
|
}, 500)
|
||
|
|
}
|
||
|
|
const analyzer = ctx.createAnalyser()
|
||
|
|
//analyzer.smoothingTimeConstant = 0
|
||
|
|
const CWIDTH = 512
|
||
|
|
const CWIDTH_MINUS_ONE = 511
|
||
|
|
const cctx = visCanvas.getContext("2d")
|
||
|
|
let q = 0;
|
||
|
|
const visualizerLoop = () => {
|
||
|
|
const w = analyzer.frequencyBinCount
|
||
|
|
const frequencyData = new Uint8Array(w)
|
||
|
|
analyzer.getByteFrequencyData(frequencyData)
|
||
|
|
const im = cctx.getImageData(1, 0, CWIDTH, w)
|
||
|
|
let max = -1;
|
||
|
|
let maxIndex = -1;
|
||
|
|
for (let i = 0; i < w; i++) {
|
||
|
|
im.data[(i * CWIDTH + CWIDTH_MINUS_ONE) * 4 + 3] = 255
|
||
|
|
im.data[(i * CWIDTH + CWIDTH_MINUS_ONE) * 4 + 1] = frequencyData[i]
|
||
|
|
if (frequencyData[i] > max) {
|
||
|
|
max = frequencyData[i]
|
||
|
|
maxIndex = i
|
||
|
|
}
|
||
|
|
}
|
||
|
|
console.log((maxIndex + 1) / w * 24000)
|
||
|
|
cctx.putImageData(im, 0, 0)
|
||
|
|
q++
|
||
|
|
requestAnimationFrame(visualizerLoop)
|
||
|
|
}
|
||
|
|
document.querySelector("#send").addEventListener("click", () => {
|
||
|
|
transmit(encoder.encode(document.querySelector("#text").value))
|
||
|
|
})
|
||
|
|
document.querySelector("#recv").addEventListener("click", () => {
|
||
|
|
navigator.mediaDevices.getUserMedia({video: false, audio: true}).then(stream => {
|
||
|
|
console.log(stream)
|
||
|
|
const node = ctx.createMediaStreamSource(stream)
|
||
|
|
node.connect(analyzer)
|
||
|
|
visCanvas.height = analyzer.frequencyBinCount
|
||
|
|
visCanvas.width = CWIDTH
|
||
|
|
cctx.fillStyle = "black"
|
||
|
|
cctx.fillRect(0, 0, CWIDTH, analyzer.frequencyBinCount)
|
||
|
|
requestAnimationFrame(visualizerLoop)
|
||
|
|
})
|
||
|
|
})
|
||
|
|
</script>
|