CalvinBackup/binaural-beats-generator
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Update background.js

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pliny
2023-08-23 07:54:13 -07:00
committed by GitHub
parent 7cff2631d1
commit af571c1bc6
1 changed files with 42 additions and 38 deletions
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80
background.js
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@@ -1,17 +1,21 @@
let audioContext = new (window.AudioContext || window.webkitAudioContext)();
let oscillatorLeft, oscillatorRight, gainNode;
let isPlaying = false;
let audioContext = null;
let oscillatorLeft = null;
let oscillatorRight = null;
let gainNode = null;
function startBinauralBeats(frequency = 440, delta = 10) {
if (audioContext) {
stopBinauralBeats();
}
audioContext = new AudioContext();
function startBinauralBeats() {
oscillatorLeft = audioContext.createOscillator();
oscillatorRight = audioContext.createOscillator();
gainNode = audioContext.createGain();
oscillatorLeft.type = 'sine';
oscillatorRight.type = 'sine';
updateFrequencies();
updateVolume();
oscillatorLeft.frequency.value = frequency;
oscillatorRight.frequency.value = frequency + delta;
oscillatorLeft.connect(gainNode);
oscillatorRight.connect(gainNode);
@@ -19,38 +23,38 @@ function startBinauralBeats() {
oscillatorLeft.start();
oscillatorRight.start();
isPlaying = true;
}
function stopBinauralBeats() {
oscillatorLeft.stop();
oscillatorRight.stop();
isPlaying = false;
if (oscillatorLeft) oscillatorLeft.stop();
if (oscillatorRight) oscillatorRight.stop();
if (audioContext) audioContext.close();
oscillatorLeft = null;
oscillatorRight = null;
audioContext = null;
}
function updateFrequencies(frequency, delta) {
oscillatorLeft.frequency.setValueAtTime(frequency, audioContext.currentTime);
oscillatorRight.frequency.setValueAtTime(frequency + delta, audioContext.currentTime);
}
function updateVolume(volume) {
gainNode.gain.setValueAtTime(volume, audioContext.currentTime);
}
chrome.runtime.onMessage.addListener((message, sender, sendResponse) => {
switch (message.action) {
case 'start':
startBinauralBeats();
break;
case 'stop':
stopBinauralBeats();
break;
case 'updateFrequencies':
updateFrequencies(message.frequency, message.delta);
break;
case 'updateVolume':
updateVolume(message.volume);
break;
}
chrome.runtime.onConnect.addListener((port) => {
port.onMessage.addListener((message) => {
switch (message.action) {
case 'start':
startBinauralBeats();
break;
case 'stop':
stopBinauralBeats();
break;
case 'updateFrequencies':
if (oscillatorLeft && oscillatorRight) {
oscillatorLeft.frequency.value = message.frequency;
oscillatorRight.frequency.value = message.frequency + message.delta;
}
break;
case 'updateVolume':
if (gainNode) {
gainNode.gain.value = message.volume;
}
break;
}
});
});