Telegram Web K with changes to work inside I2P https://web.telegram.i2p/
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type Result = {
bytes: Uint8Array,
waveform?: Uint8Array
};
type Task = {
pages: Uint8Array,
withWaveform: boolean,
waveform?: Uint8Array,
callback: {resolve: (result: Result) => void, reject: (err: Error) => void}
};
export class OpusDecodeController {
private worker: Worker;
private wavWorker : Worker;
private sampleRate = 48000;
private tasks: Array<Task> = [];
private keepAlive = false;
public loadWavWorker() {
if(this.wavWorker) return;
this.wavWorker = new Worker('waveWorker.min.js');
this.wavWorker.addEventListener('message', (e) => {
const data = e.data;
if(data && data.page) {
const bytes = data.page;
this.onTaskEnd(this.tasks.shift(), bytes);
}
});
}
public loadWorker() {
if(this.worker) return;
this.worker = new Worker('decoderWorker.min.js');
this.worker.addEventListener('message', (e) => {
const data = e.data;
if(data.type == 'done') {
this.wavWorker.postMessage({command: 'done'});
if(data.waveform) {
this.tasks[0].waveform = data.waveform;
}
} else { // e.data contains decoded buffers as float32 values
this.wavWorker.postMessage({
command: 'encode',
buffers: e.data
}, data.map((typedArray: Uint8Array) => typedArray.buffer));
}
});
}
public setKeepAlive(keepAlive: boolean) {
this.keepAlive = keepAlive;
if(this.keepAlive) {
this.loadWorker();
this.loadWavWorker();
} else if(!this.tasks.length) {
this.terminateWorkers();
}
}
public onTaskEnd(task: Task, result: Uint8Array) {
task.callback.resolve({bytes: result, waveform: task.waveform});
if(this.tasks.length) {
this.executeNewTask(this.tasks[0]);
}
this.terminateWorkers();
}
public terminateWorkers() {
if(this.keepAlive || this.tasks.length) return;
this.worker.terminate();
this.worker = null;
this.wavWorker.terminate();
this.wavWorker = null;
}
public executeNewTask(task: Task) {
this.worker.postMessage({
command: 'init',
decoderSampleRate: this.sampleRate,
outputBufferSampleRate: this.sampleRate
});
this.wavWorker.postMessage({
command: 'init',
wavBitDepth: 16,
wavSampleRate: this.sampleRate
});
//console.log('sending command to worker:', task);
//setTimeout(() => {
this.worker.postMessage({
command: 'decode',
pages: task.pages,
waveform: task.withWaveform
}, [task.pages.buffer]);
//}, 1e3);
}
public pushDecodeTask(pages: Uint8Array, withWaveform: boolean) {
return new Promise<Result>((resolve, reject) => {
const task = {
pages,
withWaveform,
callback: {resolve, reject}
};
this.loadWorker();
this.loadWavWorker();
if(this.tasks.push(task) == 1) {
this.executeNewTask(task);
}
});
}
public async decode(typedArray: Uint8Array, withWaveform = false) {
return this.pushDecodeTask(typedArray, withWaveform).then(result => {
const dataBlob = new Blob([result.bytes], {type: "audio/wav"});
return {url: URL.createObjectURL(dataBlob), waveform: result.waveform};
});
}
}
export default new OpusDecodeController();