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Adicionando o ggwave.js

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Rafael Tavares Juliani 2025-05-13 17:01:20 -03:00
parent eee054259f
commit d8efdf827a
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<!doctype html>
<html lang="en-us">
<head>
<title>ggwave : javascript example</title>
</head>
<body>
<div id="main-container">
Minimal <b>ggwave</b> example using Javascript bindings
<br><br>
<div>Tx Data:</div> <textarea name="textarea" id="txData" style="width:300px;height:100px;">Hello javascript</textarea><br>
<button onclick="onSend();">Send</button>
<br><br>
<div>Rx data:</div> <textarea name="textarea" id="rxData" style="width:300px;height:100px;" disabled></textarea><br>
<button id="captureStart">Start capturing</button>
<button id="captureStop" hidden>Stop capturing</button>
<br><br>
<div class="cell-version">
<span>
|
Build time: <span class="nav-link">@GIT_DATE@</span> |
Commit hash: <a class="nav-link" href="https://github.com/ggerganov/ggwave/commit/@GIT_SHA1@">@GIT_SHA1@</a> |
Commit subject: <span class="nav-link">@GIT_COMMIT_SUBJECT@</span> |
<a class="nav-link" href="https://github.com/ggerganov/ggwave/tree/master/examples/ggwave-js">Source Code</a> |
</span>
</div>
</div>
<script type="text/javascript" src="ggwave.js"></script>
<script type='text/javascript'>
window.AudioContext = window.AudioContext || window.webkitAudioContext;
window.OfflineAudioContext = window.OfflineAudioContext || window.webkitOfflineAudioContext;
var context = null;
var recorder = null;
// the ggwave module instance
var ggwave = null;
var parameters = null;
var instance = null;
// instantiate the ggwave instance
// ggwave_factory comes from the ggwave.js module
ggwave_factory().then(function(obj) {
ggwave = obj;
});
var txData = document.getElementById("txData");
var rxData = document.getElementById("rxData");
var captureStart = document.getElementById("captureStart");
var captureStop = document.getElementById("captureStop");
// helper function
function convertTypedArray(src, type) {
var buffer = new ArrayBuffer(src.byteLength);
var baseView = new src.constructor(buffer).set(src);
return new type(buffer);
}
// initialize audio context and ggwave
function init() {
if (!context) {
context = new AudioContext({sampleRate: 48000});
parameters = ggwave.getDefaultParameters();
parameters.sampleRateInp = context.sampleRate;
parameters.sampleRateOut = context.sampleRate;
instance = ggwave.init(parameters);
}
}
//
// Tx
//
function onSend() {
init();
// pause audio capture during transmission
captureStop.click();
// generate audio waveform
var waveform = ggwave.encode(instance, txData.value, ggwave.ProtocolId.GGWAVE_PROTOCOL_AUDIBLE_FAST, 10)
// play audio
var buf = convertTypedArray(waveform, Float32Array);
var buffer = context.createBuffer(1, buf.length, context.sampleRate);
buffer.getChannelData(0).set(buf);
var source = context.createBufferSource();
source.buffer = buffer;
source.connect(context.destination);
source.start(0);
}
//
// Rx
//
captureStart.addEventListener("click", function () {
init();
let constraints = {
audio: {
// not sure if these are necessary to have
echoCancellation: false,
autoGainControl: false,
noiseSuppression: false
}
};
navigator.mediaDevices.getUserMedia(constraints).then(function (e) {
mediaStream = context.createMediaStreamSource(e);
var bufferSize = 1024;
var numberOfInputChannels = 1;
var numberOfOutputChannels = 1;
if (context.createScriptProcessor) {
recorder = context.createScriptProcessor(
bufferSize,
numberOfInputChannels,
numberOfOutputChannels);
} else {
recorder = context.createJavaScriptNode(
bufferSize,
numberOfInputChannels,
numberOfOutputChannels);
}
recorder.onaudioprocess = function (e) {
var source = e.inputBuffer;
var res = ggwave.decode(instance, convertTypedArray(new Float32Array(source.getChannelData(0)), Int8Array));
if (res && res.length > 0) {
res = new TextDecoder("utf-8").decode(res);
rxData.value = res;
}
// obsolete javascript resampling
// since ggwave v0.2.0 the resampling is built-in ggwave
//var offlineCtx = new OfflineAudioContext(source.numberOfChannels, 48000*source.duration, 48000);
//var offlineSource = offlineCtx.createBufferSource();
//offlineSource.buffer = source;
//offlineSource.connect(offlineCtx.destination);
//offlineSource.start();
//offlineCtx.startRendering();
//offlineCtx.oncomplete = function(e) {
// var resampled = e.renderedBuffer.getChannelData(0);
// var res = ggwave.decode(instance, convertTypedArray(new Float32Array(resampled), Int8Array));
// if (res) {
// rxData.value = res;
// }
//};
}
mediaStream.connect(recorder);
recorder.connect(context.destination);
}).catch(function (e) {
console.error(e);
});
rxData.value = 'Listening ...';
captureStart.hidden = true;
captureStop.hidden = false;
});
captureStop.addEventListener("click", function () {
if (recorder) {
recorder.disconnect(context.destination);
mediaStream.disconnect(recorder);
recorder = null;
}
rxData.value = 'Audio capture is paused! Press the "Start capturing" button to analyze audio from the microphone';
captureStart.hidden = false;
captureStop.hidden = true;
});
captureStop.click();
</script>
</body>
</html>