182 lines
6.6 KiB
PHP
182 lines
6.6 KiB
PHP
<!DOCTYPE html>
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<html>
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<head>
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<meta charset="utf-8" />
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<title></title>
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</head>
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<body>
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<h1>Audio</h1>
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<button id="startRecordingButton">Start recording</button>
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<button id="stopRecordingButton">Stop recording</button>
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<button id="playButton">Play</button>
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<button id="downloadButton">Download</button>
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<script>
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var startRecordingButton = document.getElementById("startRecordingButton");
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var stopRecordingButton = document.getElementById("stopRecordingButton");
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var playButton = document.getElementById("playButton");
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var downloadButton = document.getElementById("downloadButton");
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var leftchannel = [];
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var rightchannel = [];
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var recorder = null;
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var recordingLength = 0;
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var volume = null;
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var mediaStream = null;
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var sampleRate = 44100;
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var context = null;
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var blob = null;
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startRecordingButton.addEventListener("click", function () {
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// Initialize recorder
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navigator.getUserMedia = navigator.getUserMedia || navigator.webkitGetUserMedia || navigator.mozGetUserMedia || navigator.msGetUserMedia;
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navigator.getUserMedia(
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{
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audio: true
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},
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function (e) {
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console.log("user consent");
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// creates the audio context
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window.AudioContext = window.AudioContext || window.webkitAudioContext;
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context = new AudioContext();
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// creates an audio node from the microphone incoming stream
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mediaStream = context.createMediaStreamSource(e);
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// https://developer.mozilla.org/en-US/docs/Web/API/AudioContext/createScriptProcessor
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// bufferSize: the onaudioprocess event is called when the buffer is full
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var bufferSize = 2048;
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var numberOfInputChannels = 2;
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var numberOfOutputChannels = 2;
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if (context.createScriptProcessor) {
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recorder = context.createScriptProcessor(bufferSize, numberOfInputChannels, numberOfOutputChannels);
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} else {
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recorder = context.createJavaScriptNode(bufferSize, numberOfInputChannels, numberOfOutputChannels);
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}
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recorder.onaudioprocess = function (e) {
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leftchannel.push(new Float32Array(e.inputBuffer.getChannelData(0)));
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rightchannel.push(new Float32Array(e.inputBuffer.getChannelData(1)));
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recordingLength += bufferSize;
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}
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// we connect the recorder
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mediaStream.connect(recorder);
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recorder.connect(context.destination);
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},
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function (e) {
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console.error(e);
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});
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});
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stopRecordingButton.addEventListener("click", function () {
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// stop recording
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recorder.disconnect(context.destination);
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mediaStream.disconnect(recorder);
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// we flat the left and right channels down
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// Float32Array[] => Float32Array
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var leftBuffer = flattenArray(leftchannel, recordingLength);
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var rightBuffer = flattenArray(rightchannel, recordingLength);
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// we interleave both channels together
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// [left[0],right[0],left[1],right[1],...]
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var interleaved = interleave(leftBuffer, rightBuffer);
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// we create our wav file
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var buffer = new ArrayBuffer(44 + interleaved.length * 2);
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var view = new DataView(buffer);
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// RIFF chunk descriptor
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writeUTFBytes(view, 0, 'RIFF');
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view.setUint32(4, 44 + interleaved.length * 2, true);
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writeUTFBytes(view, 8, 'WAVE');
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// FMT sub-chunk
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writeUTFBytes(view, 12, 'fmt ');
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view.setUint32(16, 16, true); // chunkSize
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view.setUint16(20, 1, true); // wFormatTag
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view.setUint16(22, 2, true); // wChannels: stereo (2 channels)
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view.setUint32(24, sampleRate, true); // dwSamplesPerSec
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view.setUint32(28, sampleRate * 4, true); // dwAvgBytesPerSec
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view.setUint16(32, 4, true); // wBlockAlign
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view.setUint16(34, 16, true); // wBitsPerSample
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// data sub-chunk
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writeUTFBytes(view, 36, 'data');
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view.setUint32(40, interleaved.length * 2, true);
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// write the PCM samples
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var index = 44;
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var volume = 1;
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for (var i = 0; i < interleaved.length; i++) {
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view.setInt16(index, interleaved[i] * (0x7FFF * volume), true);
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index += 2;
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}
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// our final blob
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blob = new Blob([view], { type: 'audio/wav' });
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});
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playButton.addEventListener("click", function () {
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if (blob == null) {
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return;
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}
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var url = window.URL.createObjectURL(blob);
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var audio = new Audio(url);
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audio.play();
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});
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downloadButton.addEventListener("click", function () {
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if (blob == null) {
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return;
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}
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var url = URL.createObjectURL(blob);
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var a = document.createElement("a");
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document.body.appendChild(a);
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a.style = "display: none";
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a.href = url;
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a.download = "sample.wav";
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a.click();
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window.URL.revokeObjectURL(url);
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});
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function flattenArray(channelBuffer, recordingLength) {
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var result = new Float32Array(recordingLength);
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var offset = 0;
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for (var i = 0; i < channelBuffer.length; i++) {
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var buffer = channelBuffer[i];
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result.set(buffer, offset);
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offset += buffer.length;
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}
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return result;
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}
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function interleave(leftChannel, rightChannel) {
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var length = leftChannel.length + rightChannel.length;
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var result = new Float32Array(length);
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var inputIndex = 0;
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for (var index = 0; index < length;) {
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result[index++] = leftChannel[inputIndex];
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result[index++] = rightChannel[inputIndex];
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inputIndex++;
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}
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return result;
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}
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function writeUTFBytes(view, offset, string) {
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for (var i = 0; i < string.length; i++) {
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view.setUint8(offset + i, string.charCodeAt(i));
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}
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}
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</script>
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</body>
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</html> |