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August 29, 2015 14:17
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A stopwatch that starts and stop by voice - http://jsfiddle.net/7bmjyve2/
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| <html> | |
| <head> | |
| <title>Microphone Stopwatch</title> | |
| </head> | |
| <body> | |
| <div id="time"></div> | |
| <script type='text/javascript'> | |
| var audioCtx = new (window.AudioContext || window.webkitAudioContext)(); | |
| var lastSnap = 0; | |
| var timeEl = document.getElementById('time'); | |
| navigator.getUserMedia = (navigator.getUserMedia || | |
| navigator.webkitGetUserMedia || | |
| navigator.mozGetUserMedia || | |
| navigator.msGetUserMedia); | |
| if(navigator.getUserMedia) { | |
| timeEl.innerText = "Clap or yell to start the stopwatch"; | |
| navigator.getUserMedia({audio: true}, function(stream) { | |
| // Build nodes | |
| var source = audioCtx.createMediaStreamSource(stream); | |
| var script = audioCtx.createScriptProcessor(256, 1, 1); | |
| var gain = audioCtx.createGain(); | |
| // Configure nodes | |
| gain.gain.value = 0; // Must include muting for scripting to work | |
| script.onaudioprocess = function(e) { | |
| // Check if volume is about a certain level | |
| var input = e.inputBuffer; | |
| var inputData = input.getChannelData(0); | |
| // Loop through the samples | |
| for (var sample = 0; sample < input.length; sample++) { | |
| if(Date.now() - lastSnap > 400 && Math.abs(inputData[sample]) > 0.04) { | |
| console.log('snap'); | |
| flipStopwatch(); | |
| lastSnap = Date.now(); | |
| break; | |
| } | |
| } | |
| } | |
| // Chain nodes | |
| source.connect(script); | |
| script.connect(gain); | |
| gain.connect(audioCtx.destination); | |
| }, function (err) { | |
| console.log('The following error occured: ' + err); | |
| }) | |
| } else { | |
| timeEl.innerText = "Microphones aren't supported in this browser." | |
| } | |
| var startTime; | |
| var clock; | |
| function flipStopwatch() { | |
| if(clock) { | |
| stopStopwatch(); | |
| } else { | |
| startStopwatch(); | |
| } | |
| } | |
| function startStopwatch() { | |
| startTime = Date.now(); | |
| updateTime(); | |
| clock = setInterval(updateTime, 15); | |
| } | |
| function stopStopwatch() { | |
| clearInterval(clock); | |
| clock = null; | |
| } | |
| function updateTime() { | |
| timeEl.innerText = ((Date.now() - startTime)/1000).toFixed(3); | |
| } | |
| </script> | |
| </body> | |
| </html> |
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