Adicionando o ggwave.js
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Rafael Tavares Juliani
commit
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LICENSE
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LICENSE
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MIT License
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Copyright (c) 2025 editoramoan
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Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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README.md
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README.md
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# moan-audio-link
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É uma espécie de "qr code" sonoro. Neste app, você pode gerar um código sonoro a partir de um link e, depois neste mesmo app, ouvir esse código e ir automaticamente para o link.
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Este app é inteiramente baseado em: <https://github.com/ggerganov/ggwave/tree/master>.
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index.html
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index.html
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<!doctype html>
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<html lang="en-us">
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<head>
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<title>ggwave : javascript example</title>
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</head>
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<body>
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<div id="main-container">
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Minimal <b>ggwave</b> example using Javascript bindings
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<br><br>
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<div>Tx Data:</div> <textarea name="textarea" id="txData" style="width:300px;height:100px;">Hello javascript</textarea><br>
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<button onclick="onSend();">Send</button>
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<br><br>
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<div>Rx data:</div> <textarea name="textarea" id="rxData" style="width:300px;height:100px;" disabled></textarea><br>
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<button id="captureStart">Start capturing</button>
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<button id="captureStop" hidden>Stop capturing</button>
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<br><br>
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<div class="cell-version">
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<span>
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Build time: <span class="nav-link">@GIT_DATE@</span> |
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Commit hash: <a class="nav-link" href="https://github.com/ggerganov/ggwave/commit/@GIT_SHA1@">@GIT_SHA1@</a> |
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Commit subject: <span class="nav-link">@GIT_COMMIT_SUBJECT@</span> |
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<a class="nav-link" href="https://github.com/ggerganov/ggwave/tree/master/examples/ggwave-js">Source Code</a> |
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</span>
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</div>
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</div>
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<script type="text/javascript" src="ggwave.js"></script>
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<script type='text/javascript'>
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window.AudioContext = window.AudioContext || window.webkitAudioContext;
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window.OfflineAudioContext = window.OfflineAudioContext || window.webkitOfflineAudioContext;
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var context = null;
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var recorder = null;
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// the ggwave module instance
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var ggwave = null;
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var parameters = null;
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var instance = null;
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// instantiate the ggwave instance
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// ggwave_factory comes from the ggwave.js module
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ggwave_factory().then(function(obj) {
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ggwave = obj;
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});
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var txData = document.getElementById("txData");
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var rxData = document.getElementById("rxData");
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var captureStart = document.getElementById("captureStart");
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var captureStop = document.getElementById("captureStop");
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// helper function
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function convertTypedArray(src, type) {
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var buffer = new ArrayBuffer(src.byteLength);
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var baseView = new src.constructor(buffer).set(src);
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return new type(buffer);
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}
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// initialize audio context and ggwave
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function init() {
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if (!context) {
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context = new AudioContext({sampleRate: 48000});
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parameters = ggwave.getDefaultParameters();
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parameters.sampleRateInp = context.sampleRate;
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parameters.sampleRateOut = context.sampleRate;
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instance = ggwave.init(parameters);
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}
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}
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//
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// Tx
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//
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function onSend() {
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init();
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// pause audio capture during transmission
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captureStop.click();
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// generate audio waveform
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var waveform = ggwave.encode(instance, txData.value, ggwave.ProtocolId.GGWAVE_PROTOCOL_AUDIBLE_FAST, 10)
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// play audio
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var buf = convertTypedArray(waveform, Float32Array);
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var buffer = context.createBuffer(1, buf.length, context.sampleRate);
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buffer.getChannelData(0).set(buf);
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var source = context.createBufferSource();
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source.buffer = buffer;
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source.connect(context.destination);
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source.start(0);
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}
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//
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// Rx
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//
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captureStart.addEventListener("click", function () {
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init();
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let constraints = {
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audio: {
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// not sure if these are necessary to have
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echoCancellation: false,
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autoGainControl: false,
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noiseSuppression: false
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}
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};
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navigator.mediaDevices.getUserMedia(constraints).then(function (e) {
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mediaStream = context.createMediaStreamSource(e);
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var bufferSize = 1024;
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var numberOfInputChannels = 1;
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var numberOfOutputChannels = 1;
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if (context.createScriptProcessor) {
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recorder = context.createScriptProcessor(
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bufferSize,
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numberOfInputChannels,
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numberOfOutputChannels);
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} else {
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recorder = context.createJavaScriptNode(
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bufferSize,
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numberOfInputChannels,
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numberOfOutputChannels);
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}
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recorder.onaudioprocess = function (e) {
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var source = e.inputBuffer;
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var res = ggwave.decode(instance, convertTypedArray(new Float32Array(source.getChannelData(0)), Int8Array));
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if (res && res.length > 0) {
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res = new TextDecoder("utf-8").decode(res);
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rxData.value = res;
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}
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// obsolete javascript resampling
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// since ggwave v0.2.0 the resampling is built-in ggwave
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//var offlineCtx = new OfflineAudioContext(source.numberOfChannels, 48000*source.duration, 48000);
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//var offlineSource = offlineCtx.createBufferSource();
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//offlineSource.buffer = source;
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//offlineSource.connect(offlineCtx.destination);
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//offlineSource.start();
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//offlineCtx.startRendering();
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//offlineCtx.oncomplete = function(e) {
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// var resampled = e.renderedBuffer.getChannelData(0);
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// var res = ggwave.decode(instance, convertTypedArray(new Float32Array(resampled), Int8Array));
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// if (res) {
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// rxData.value = res;
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// }
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//};
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}
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mediaStream.connect(recorder);
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recorder.connect(context.destination);
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}).catch(function (e) {
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console.error(e);
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});
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rxData.value = 'Listening ...';
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captureStart.hidden = true;
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captureStop.hidden = false;
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});
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captureStop.addEventListener("click", function () {
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if (recorder) {
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recorder.disconnect(context.destination);
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mediaStream.disconnect(recorder);
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recorder = null;
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}
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rxData.value = 'Audio capture is paused! Press the "Start capturing" button to analyze audio from the microphone';
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captureStart.hidden = false;
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captureStop.hidden = true;
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});
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captureStop.click();
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</script>
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</body>
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</html>
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