Skip to content

Instantly share code, notes, and snippets.

Fix WontFix


Fix WontFix
View GitHub Profile
View gist:983f2c16d36aee7f75cff4ac477d6805
class WebmPacketizer : IPacketizer {
private UInt64 position = 0;
static WebmPacketizer () {
public WebmPacketizer() {
private static Byte[] Concat(params Byte[][] parts) {
View gist:c52757fef62239d502806f53b6700a58
class OggPacketizer : IPacketizer {
static UInt32[] checksumTable;
static UInt32 serial_counter = 1;
uint pageIndex = 0;
uint serial;
UInt64 position = 0;
static OggPacketizer() {
jeffposnick / register-sw.js
Last active Sep 13, 2021
A modern-ish SW registration script, detecting various state changes.
View register-sw.js
if ('serviceWorker' in navigator) {
window.addEventListener('load', async function() {
const registration = await navigator.serviceWorker.register('/service-worker.js');
if (registration.waiting && {
// The page has been loaded when there's already a waiting and active SW.
// This would happen if skipWaiting isn't being called, and there are
// still old tabs open.
console.log('Please close all tabs to get updates.');
} else {
// updatefound is also fired for the very first install. ¯\_(ツ)_/¯
astoeckel /
Last active Oct 12, 2021
Stream audio from pulse audio as opus stream via UDP/RTP
pacat \
--device=alsa_output.pci-0000_00_1b.0.analog-stereo.monitor \
--rate=48000 \
--record | \
opusenc \
--expect-loss=25 \
--max-delay=0 \
--framesize=2.5 \
laerciobernardo / hexIEEEtoFloat.js
Last active Nov 27, 2021
Convert Hexadecimal IEEE754 to Float in Javascript
View hexIEEEtoFloat.js
var str = '0x41FC6733';
function parseFloat(str) {
var float = 0, sign, order, mantiss,exp,
int = 0, multi = 1;
if (/^0x/.exec(str)) {
int = parseInt(str,16);
for (var i = str.length -1; i >=0; i -= 1) {
if (str.charCodeAt(i)>255) {
UCIS / gist:845eda1755d38eddfc3f0f99268c27da
Created Jun 17, 2020
Opus/WebM player in JavaScript
View gist:845eda1755d38eddfc3f0f99268c27da
function OpusWebmPacker() {
var channels = 2;
var sample_rate = 48000;
var position = 0;
var packets = [];
var buffer = new Uint8Array(4 + 1275);
var buffer_offset = 0;
function Concat() {
domenic / 1-service-worker.js
Last active Feb 6, 2022
Service worker stream transferring
View 1-service-worker.js
"use strict";
const worker = new Worker("worker.js");
self.onfetch = e => {
const transform = new TransformStream(); // creates an identity transform
e.respondWith(new Response(transform.readable));
// Give the worker the writable end. An identity transform stream will just shuffle
// bytes written there into transform.readable.
amishshah /
Last active Mar 18, 2022
A guide to the Ogg container format for demuxing opus audio

You take a stream/buffer of binary data. The start of your data is a "Page", which has a header followed by data.


You need to read the following data from the header (see for more detail)

  • capture_pattern - bytes 0 to 3, must read OggS
  • stream_structure_version - byte 4, must be 0
  • header_type_flag - byte 5, a bitflag that tells you metadata about the page (is it a new packet? is a packet continued here? is it the first/last page of the stream?)
  • absolute granule position - bytes 6 to 13, not needed unless you want seeking
  • stream serial number - bytes 14 to 17, a serial number given to each stream contained in the Ogg file. This is important for playing Ogg files that contain other streams, such as video or cover art. You need to identify and only bother parsing the Opus stream.
marchelbling /
Last active Apr 1, 2022
C++ json writer


This code implements a naive JSON writer in C++ complying with RFC 4627. I wrote this as I believe it is a very good example of a real life problem involving lots of C++ constructs. This sample only supports writing JSON and does not support heterogenous ‘object’ serialization and extension are left as an exercice. See Writing json in C++ for some details.


  • json_stream: a std::ofstream wrapper fulfilling RFC 4627 constraints;
  • utf8_json: some code to decode/“json encode” std::string UTF-8 buffers
  • json_test.cpp: a very simple program testing the code
ignacysokolowski /
Created Oct 29, 2012
Python: Play a WAV file with PulseAudio simple API
#!/usr/bin/env python
import ctypes
import wave
import sys
pa = ctypes.cdll.LoadLibrary('')