Last active
November 11, 2017 02:23
-
-
Save hibuno/63266aa79268179cd12f51879d107a66 to your computer and use it in GitHub Desktop.
Script for Audio Context Tutorial at my medium account (https://medium.com/@muhibbudins)
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| <!DOCTYPE html> | |
| <html lang="en"> | |
| <head> | |
| <meta charset="UTF-8"> | |
| <title>SoundWave</title> | |
| <style> | |
| canvas { | |
| background-color: #101010; | |
| width: 600px; | |
| height: 300px; | |
| transform: scale(-1, -1); | |
| } | |
| audio { | |
| width: 600px; | |
| } | |
| </style> | |
| </head> | |
| <body> | |
| <div class="wrapper"> | |
| <canvas id="visualizer"></canvas> | |
| <audio src="" id="player" controls="true"></audio> | |
| <div>Choose Song : <input type="file" id="source"></div> | |
| <div>Song Name : <span id="song_name"></span></div> | |
| <div>Format : <span id="song_format"></span></div> | |
| </div> | |
| <script type="text/javascript"> | |
| const | |
| source = document.getElementById('source'), | |
| player = document.getElementById('player'), | |
| canvas = document.getElementById('visualizer'), | |
| name = document.getElementById('song_name'), | |
| format = document.getElementById('song_format'), | |
| blob = window.URL || window.webkitURL, | |
| color = ['#1abc9c','#2ecc71','#3498db','#9b59b6','#34495e','#16a085','#27ae60','#2980b9','#8e44ad']; | |
| // Check if blob is exist in this browser | |
| if (!blob) { | |
| console.warn('Your browser does not support Blob URLs.'); | |
| } | |
| // Load song to player | |
| source.addEventListener('change', (e) => { | |
| let | |
| file = e.target.files[0], | |
| fileURL = blob.createObjectURL(file); | |
| name.innerHTML = file.name; | |
| format.innerHTML = file.type; | |
| player.src = fileURL; | |
| player.play(); | |
| stream(); | |
| }); | |
| function stream() { | |
| const | |
| audio = new(window.AudioContext || window.webkitAudioContext)(), | |
| analyser = audio.createAnalyser(); | |
| player.addEventListener('canplay', (e) => { | |
| let source = audio.createMediaElementSource(player); | |
| source.connect(analyser); | |
| analyser.connect(audio.destination); | |
| analyser.fftSize = 128; | |
| frequencyLength = analyser.frequencyBinCount; | |
| let frequency = new Uint8Array(frequencyLength); | |
| analyser.getByteFrequencyData(frequency); | |
| // console.log(frequency) | |
| // Prepare Canvas | |
| const context = canvas.getContext('2d'); | |
| // Draw wave | |
| function draw() { | |
| requestAnimationFrame(draw); | |
| analyser.getByteFrequencyData(frequency); | |
| // console.log(frequency) | |
| context.fillStyle = '#101010'; | |
| context.fillRect(0, 0, canvas.width, canvas.height); | |
| context.lineWidth = 1.5; | |
| context.strokeStyle = colorize(); | |
| context.beginPath(); | |
| var sliceWidth = canvas.width * 1.0 / frequencyLength; | |
| var x = 0; | |
| for (var i = 0; i < frequencyLength; i++) { | |
| var v = frequency[i] / 256.0; | |
| var y = v * canvas.height / 2; | |
| if (i === 0) { | |
| context.moveTo(x, y); | |
| } else { | |
| context.lineTo(x, y); | |
| } | |
| x += sliceWidth; | |
| } | |
| context.lineTo(canvas.width, canvas.height / 2); | |
| context.stroke(); | |
| }; | |
| draw(); | |
| }); | |
| }; | |
| // Create Random Color | |
| function colorize() { | |
| return color[Math.round((Math.random() * 10))] || '#ffffff'; | |
| } | |
| </script> | |
| </body> | |
| </html> |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment