Web Audio API\u3067\u30de\u30a4\u30af\u306e\u97f3\u3092\u30c7\u30fc\u30bf\u53d6\u5f97\u3057\u3066\u89e3\u6790\u3059\u308b\u65b9\u6cd5\u306f\u3001\u4ee5\u4e0b\u306e\u901a\u308a<\/p>\n
<!DOCTYPE html>\r\n<html>\r\n <head>\r\n <meta charset=\"UTF-8\" \/>\r\n <title>\u97f3\u58f0\u89e3\u6790<\/title>\r\n <\/head>\r\n <body>\r\n <button onclick=\"startRecording()\">\u89e3\u6790\u958b\u59cb<\/button>\r\n <button onclick=\"endRecording()\">\u89e3\u6790\u7d42\u4e86<\/button>\r\n <hr>\r\n <\/body>\r\n<\/html>\r\n<script>\r\n\/\/ \u30af\u30ed\u30b9\u30d6\u30e9\u30a6\u30b6\u5b9a\u7fa9\r\nnavigator.getUserMedia = navigator.getUserMedia || navigator.webkitGetUserMedia || navigator.mozGetUserMedia;\r\n\r\n\/\/ \u5909\u6570\u5b9a\u7fa9\r\nvar localMediaStream = null;\r\nvar localScriptProcessor = null;\r\nvar audioContext = new AudioContext();\r\nvar bufferSize = 1024;\r\nvar audioData = []; \/\/ \u9332\u97f3\u30c7\u30fc\u30bf\r\nvar recordingFlg = false;\r\n\r\n\r\n\/\/ \u97f3\u58f0\u89e3\u6790\r\nvar audioAnalyser = null;\r\n\r\n\r\n\/\/ \u9332\u97f3\u30d0\u30c3\u30d5\u30a1\u4f5c\u6210\uff08\u9332\u97f3\u4e2d\u81ea\u52d5\u3067\u7e70\u308a\u8fd4\u3057\u547c\u3073\u51fa\u3055\u308c\u308b\uff09\r\nvar onAudioProcess = function(e) {\r\n if (!recordingFlg) return;\r\n\r\n \/\/ \u97f3\u58f0\u306e\u30d0\u30c3\u30d5\u30a1\u3092\u4f5c\u6210\r\n var input = e.inputBuffer.getChannelData(0);\r\n var bufferData = new Float32Array(bufferSize);\r\n for (var i = 0; i < bufferSize; i++) {\r\n bufferData[i] = input[i];\r\n }\r\n audioData.push(bufferData);\/\/\u9332\u97f3\u30c7\u30fc\u30bf\u306b\u8ffd\u52a0\r\n\r\n \/\/ \u30aa\u30fc\u30c7\u30a3\u30aa\u30c7\u30fc\u30bf\u53d6\u5f97\r\n var fsDivN = audioContext.sampleRate \/ audioAnalyser.fftSize;\r\n var spectrums = new Uint8Array(audioAnalyser.frequencyBinCount);\r\n audioAnalyser.getByteFrequencyData(spectrums);\r\n\r\n \/\/...spectrums\u3068\u3044\u3046Uint8Array\u30c7\u30fc\u30bf\u3092\u3042\u3068\u306f\u89e3\u6790\u3059\u308b\r\n \/\/\u4f8b\u3048\u3070\u3001Circular Audio Wave\u306e\u3088\u3046\u306aUint8Array\u3092\u6271\u3063\u3066\u3044\u308b\u30aa\u30fc\u30c7\u30a3\u30aa\u30d3\u30b8\u30e5\u30a2\u30e9\u30a4\u30b6\u306b\u308f\u305f\u3059\u3068\u30de\u30a4\u30af\u306e\u97f3\u58f0\u3092\u8996\u899a\u5316\u3067\u304d\u308b\r\n \r\n};\r\n\r\n\r\n\r\n\/\/ \u89e3\u6790\u958b\u59cb\r\nvar startRecording = function() {\r\n recordingFlg = true;\r\n navigator.getUserMedia({audio: true}, function(stream) {\r\n \/\/ \u9332\u97f3\u95a2\u9023\r\n localMediaStream = stream;\r\n var scriptProcessor = audioContext.createScriptProcessor(bufferSize, 1, 1);\r\n localScriptProcessor = scriptProcessor;\r\n var mediastreamsource = audioContext.createMediaStreamSource(stream);\r\n mediastreamsource.connect(scriptProcessor);\r\n scriptProcessor.onaudioprocess = onAudioProcess;\r\n scriptProcessor.connect(audioContext.destination);\r\n\r\n \/\/ \u97f3\u58f0\u89e3\u6790\u95a2\u9023\r\n audioAnalyser = audioContext.createAnalyser();\r\n audioAnalyser.fftSize = 2048;\r\n frequencyData = new Uint8Array(audioAnalyser.frequencyBinCount);\r\n timeDomainData = new Uint8Array(audioAnalyser.frequencyBinCount);\r\n mediastreamsource.connect(audioAnalyser);\r\n\r\n },\r\n function(e) {\r\n console.log(e);\r\n });\r\n};\r\n\r\n\/\/ \u89e3\u6790\u7d42\u4e86\r\nvar endRecording = function() {\r\n recordingFlg = false;\r\n\r\n \/\/audioData\u3092\u30b5\u30fc\u30d0\u306b\u9001\u4fe1\u3059\u308b\u306a\u3069\u7d42\u4e86\u51e6\u7406\r\n};\r\n\r\n<\/script><\/pre>\n <\/p>\n
\u53c2\u8003URL\uff1a<\/p>\n
getUserMedia\u3067\u97f3\u58f0\u3092\u62fe\u3044\u30ea\u30a2\u30eb\u30bf\u30a4\u30e0\u3067\u6ce2\u5f62\u3092\u51fa\u529b\u3059\u308bhttps:\/\/qiita.com\/mhagita\/items\/6c7d73932d9a207eb94d<\/a><\/p>\nHTML5 \u306e Web Audio API \u3092\u4f7f\u3063\u3066\u30de\u30a4\u30af\u304b\u3089\u5165\u529b\u3057\u305f\u97f3\u58f0\u30c7\u30fc\u30bf\u3092\u518d\u751f\u3059\u308bhttp:\/\/dotnsf.blog.jp\/archives\/1072473945.html<\/a><\/p>\n