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Drawing zoomable audio waveform timeline in Javascript
https://stackoverflow.com/questions/11677246/drawing-zoomable-audio-waveform-timeline-in-javascript
let reduceAudioPeak = function(data, spp, scroll, width, resolution) { let drawData = new Array(width); let startSample = scroll * spp; let skip = Math.ceil(spp / …
html - Waveform visualization in JavaScript from audio ...
https://stackoverflow.com/questions/6170169/waveform-visualization-in-javascript-from-audio
8. This answer is not useful. Show activity on this post. Here's some sample code from my book ( HTML5 Multimedia: Develop and Design) that does exactly that; Audio Waveform. It uses the Mozilla Audio Data API. The code simply takes snapshots of the audio data and uses it to draw on the canvas. Share.
Building an Audio Visualizer With JavaScript. | by Austin ...
https://medium.com/swlh/building-a-audio-visualizer-with-javascript-324b8d420e7
function draw(data){data = [...data]; ctx.clearRect(0,0,canvas.width,canvas.height); let space = canvas.width / data.length; data.forEach((value,i)=>{ctx.beginPath(); ctx.moveTo(space*i,canvas ...
GitHub - bbc/waveform-data.js: Audio Waveform Data ...
https://github.com/bbc/waveform-data.js/
const waveform = WaveformData. create (raw_data); const scaleY = (amplitude, height) => {const range = 256; const offset = 128; return height-((amplitude + offset) * height) / range;} const ctx = canvas. getContext ('2d'); ctx. beginPath (); const channel = waveform. channel (0); // Loop forwards, drawing the upper half of the waveform for (let x = 0; x < waveform. length; x ++) …
Convert audio file to waveform data? : javascript
https://www.reddit.com/r/javascript/comments/9ngrcd/convert_audio_file_to_waveform_data/
Hello! I'd like to take an audio file as input and convert that file into the raw data which makes up the visual waveform. Once I have the values I want to plot them onto a canvas using SVG / HTML5 to dynamically draw the waveform on screen.
Visualizations with Web Audio API - Web APIs | MDN
https://developer.mozilla.org/en-US/docs/Web/API/Web_Audio_API/Visualizations_with_Web_Audio_API
function draw {drawVisual = requestAnimationFrame (draw); analyser. getByteFrequencyData (dataArray); canvasCtx. fillStyle = 'rgb(0, 0, 0)'; canvasCtx. fillRect (0, 0, WIDTH, HEIGHT); Now we set our barWidth to be equal to the canvas width divided by the number of bars (the buffer length).
wavesurfer.js
https://wavesurfer-js.org/
In your JavaScript app, create a wavesurfer instance, passing the container selector along with some options : var wavesurfer = WaveSurfer.create ( { container: '#waveform' , waveColor: 'violet' , progressColor: 'purple' }); Finally, load the audio: wavesurfer.load ( …
Waveformer - Visualizing your audio in vector waveforms
https://www.misha.studio/waveformer/
Waveformer. A simple web app for visualizing audio waveforms in vector (svg) format. Start drawing your audio by choosing or dropping your audiofile on here. Or try a sample file.
Draw waveforms and hear them
http://stevehanov.ca/blog/?id=13
Results. In theory, you can make any sound that you want. The results aren't very interesting. You can draw a sine wave and it sounds muffled. Add some jagged edges and the sound starts to sound more raw and high pitched. But it's okay to demonstrate what a sawtooth vs. sine vs. square wave sound like.
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