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ggwave-js : simplify example (#21)

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Now that ggwave support input resampling, we don't need to resample
in javascript
This commit is contained in:
Georgi Gerganov
2021-02-21 00:43:37 +02:00
committed by GitHub
parent e5c094296f
commit bd9d6b1d81
2 changed files with 23 additions and 14 deletions
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1
examples/ggwave-js/CMakeLists.txt
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@@ -1,3 +1,4 @@
set(TARGET ggwave-js)
configure_file(${CMAKE_CURRENT_SOURCE_DIR}/index-tmpl.html ${CMAKE_RUNTIME_OUTPUT_DIRECTORY}/${TARGET}/index.html @ONLY)
configure_file(${CMAKE_SOURCE_DIR}/bindings/javascript/ggwave.js ${CMAKE_RUNTIME_OUTPUT_DIRECTORY}/${TARGET}/ggwave.js COPYONLY)

36
examples/ggwave-js/index-tmpl.html
View File

@@ -67,10 +67,10 @@
// initialize audio context and ggwave
function init() {
if (!context) {
// todo : query ggwave's base sample rate
context = new AudioContext({sampleRate: 48000});
parameters = ggwave.getDefaultParameters();
parameters.sampleRateInp = context.sampleRate;
parameters.sampleRateOut = context.sampleRate;
instance = ggwave.init(parameters);
}
@@ -136,20 +136,27 @@
recorder.onaudioprocess = function (e) {
var source = e.inputBuffer;
var offlineCtx = new OfflineAudioContext(source.numberOfChannels, 48000*source.duration, 48000);
var offlineSource = offlineCtx.createBufferSource();
var res = ggwave.decode(instance, convertTypedArray(new Float32Array(source.getChannelData(0)), Int8Array));
if (res) {
rxData.value = res;
}
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;
}
};
// 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);
@@ -167,6 +174,7 @@
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';