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analyzer.js
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analyzer.js
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/* // canvas
function analyzeCanvas() {
if (player.ready()) {
const analyser = player.audioContext.createAnalyser()
player._gain.disconnect();
player._gain.connect(analyser);
analyser.connect(player.audioContext.destination);
const waveform = new Float32Array(analyser.frequencyBinCount)
analyser.getFloatTimeDomainData(waveform);
(function updateWaveform() {
requestAnimationFrame(updateWaveform)
analyser.getFloatTimeDomainData(waveform)
})();
const scopeCanvas = document.getElementById('oscilliscope')
scopeCanvas.width = waveform.length
scopeCanvas.height = 200
const scopeContext = scopeCanvas.getContext('2d');
(function drawOscilloscope() {
requestAnimationFrame(drawOscilloscope)
scopeContext.clearRect(0, 0, scopeCanvas.width, scopeCanvas.height)
scopeContext.beginPath()
for (let i = 0; i < waveform.length; i++) {
const x = i
const y = (0.5 + waveform[i] / 2) * scopeCanvas.height;
if (i == 0) {
scopeContext.moveTo(x, y)
} else {
scopeContext.lineTo(x, y)
}
}
scopeContext.stroke()
})();
}
} */
// canvas
function analyzeCanvas() {
if (player.ready()) {
var waves = [];
var analysers = [];
for (let i = 0; i < player._gains.length; i++) {
let analyser = player.audioContext.createAnalyser();
console.log(player._gains[i]);
player._gains[i].disconnect();
player._gains[i].connect(analyser);
analyser.connect(player.audioContext.destination);
let waveform = new Float32Array(analyser.frequencyBinCount)
analyser.getFloatTimeDomainData(waveform);
waves.push(waveform);
analysers.push(analyser);
}
/* const analyser = player.audioContext.createAnalyser()
player._gain.disconnect();
player._gain.connect(analyser);
analyser.connect(player.audioContext.destination); */
(function updateWaveform() {
requestAnimationFrame(updateWaveform)
for (let i = 0; i < analysers.length; i++)
analysers[i].getFloatTimeDomainData(waves[i])
})();
const scopeCanvas = document.getElementById('oscilliscope');
scopeCanvas.width = waves[0].length;
scopeCanvas.height = 200;
const scopeContext = scopeCanvas.getContext('2d');
(function drawOscilloscope() {
requestAnimationFrame(drawOscilloscope)
scopeContext.clearRect(0, 0, scopeCanvas.width, scopeCanvas.height)
scopeContext.beginPath();
for (let w = 0; w < waves.length; w++) {
let wave = waves[w];
for (let i = 0; i < wave.length; i++) {
const x = i
const y = (0.5 + wave[i] / 2) * scopeCanvas.height;
if (i == 0) {
scopeContext.moveTo(x, y)
} else {
scopeContext.lineTo(x, y)
}
}
scopeContext.strokeStyle = getRandomColor();
scopeContext.stroke();
}
// scopeContext.stroke()
})();
}
}
function getRandomInt(min, max) {
min = Math.ceil(min);
max = Math.floor(max);
return Math.floor(Math.random() * (max - min + 1)) + min;
}
function getRandomColor() {
let r = getRandomInt(0, 255);
let g = getRandomInt(0, 255);
let b = getRandomInt(0, 255);
let rgb = rgbToHex(r, g, b);
return rgb;
}
function rgbToHex(r, g, b) {
return "#" + ((1 << 24) + (r << 16) + (g << 8) + b).toString(16).slice(1);
}
/* ------------------------------------------ */
function initQuad(gl) {
const vbo = gl.createBuffer()
gl.bindBuffer(gl.ARRAY_BUFFER, vbo)
const vertices = new Float32Array([-1, -1, 1, -1, -1, 1, 1, 1])
gl.bufferData(gl.ARRAY_BUFFER, vertices, gl.STATIC_DRAW)
gl.vertexAttribPointer(0, 2, gl.FLOAT, false, 0, 0)
}
function renderQuad(gl) {
gl.drawArrays(gl.TRIANGLE_STRIP, 0, 4)
}
function createShader(gl, vertexShaderSrc, fragmentShaderSrc) {
const vertexShader = gl.createShader(gl.VERTEX_SHADER)
gl.shaderSource(vertexShader, vertexShaderSrc)
gl.compileShader(vertexShader)
if (!gl.getShaderParameter(vertexShader, gl.COMPILE_STATUS)) {
throw new Error(gl.getShaderInfoLog(vertexShader))
}
const fragmentShader = gl.createShader(gl.FRAGMENT_SHADER)
gl.shaderSource(fragmentShader, fragmentShaderSrc)
gl.compileShader(fragmentShader)
if (!gl.getShaderParameter(fragmentShader, gl.COMPILE_STATUS)) {
throw new Error(gl.getShaderInfoLog(fragmentShader))
}
const shader = gl.createProgram()
gl.attachShader(shader, vertexShader)
gl.attachShader(shader, fragmentShader)
gl.linkProgram(shader)
gl.useProgram(shader)
return shader
}
function createTexture(gl) {
const texture = gl.createTexture()
gl.bindTexture(gl.TEXTURE_2D, texture)
gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.LINEAR)
gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_S, gl.CLAMP_TO_EDGE)
gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_T, gl.CLAMP_TO_EDGE)
return texture
}
function copyAudioDataToTexture(gl, audioData, textureArray) {
for (let i = 0; i < audioData.length; i++) {
textureArray[4 * i + 0] = audioData[i] // R
textureArray[4 * i + 1] = audioData[i] // G
textureArray[4 * i + 2] = audioData[i] // B
textureArray[4 * i + 3] = 255 // A
}
gl.texImage2D(gl.TEXTURE_2D, 0, gl.RGBA, audioData.length, 1, 0, gl.RGBA, gl.UNSIGNED_BYTE, textureArray)
}
var fragCanvas, gl, vertexShaderSrc, fragmentShaderSrc, fragShader;
var fragPosition, fragTime, fragResolution, fragSpectrumArray, fragSpectrum;
function setupFancyStuff() {
if (player.ready()) {
fragCanvas = document.getElementById('fragment')
fragCanvas.width = fragCanvas.parentNode.offsetWidth
fragCanvas.height = fragCanvas.width * 0.75
gl = fragCanvas.getContext('webgl') || fragCanvas.getContext('experimental-webgl')
vertexShaderSrc = document.getElementById('vertex-shader').textContent
fragmentShaderSrc = document.getElementById('fragment-shader').textContent
fragShader = createShader(gl, vertexShaderSrc, fragmentShaderSrc);
fragPosition = gl.getAttribLocation(fragShader, 'position')
gl.enableVertexAttribArray(fragPosition)
fragTime = gl.getUniformLocation(fragShader, 'time')
gl.uniform1f(fragTime, player.audioContext.currentTime)
fragResolution = gl.getUniformLocation(fragShader, 'resolution')
gl.uniform2f(fragResolution, fragCanvas.width, fragCanvas.height)
fragSpectrum = createTexture(gl)
fragSpectrumArray = new Uint8Array(4 * fragSpectrum.length)
}
}
function doFancyStuff() {
setupFancyStuff();
initQuad(gl);
(function renderFragment() {
requestAnimationFrame(renderFragment)
gl.uniform1f(fragTime, player.audioContext.currentTime)
copyAudioDataToTexture(gl, fragSpectrum, fragSpectrumArray)
renderQuad(gl)
})();
}