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Probe Clusters in str0m

This document outlines a plan for implementing probe clusters in str0m, matching libWebRTC's bandwidth probing approach.

Scope

This plan covers probe clusters for existing media RTX/padding only. Pre-media SSRC 0 probing is out of scope and will be addressed in a separate PR that builds on this infrastructure.

Current State

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use tracing::{info_span, Span};

pub struct Blah {
    pub span: Span,
}

impl Blah {
    pub fn new(name: &str) -> Self {
        Blah {
            span: info_span!(name),

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stokast v0.1.0 (/Users/martin/dev/stokast)
├── alg v0.1.0 (/Users/martin/dev/alg)
│   ├── gcd v2.0.1
│   └── log v0.4.14
│       └── cfg-if v1.0.0
├── arrayvec v0.7.1
├── cortex-m v0.6.7
│   ├── aligned v0.3.5
│   │   └── as-slice v0.1.5
│   │       ├── generic-array v0.12.4

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use chrono::{DateTime, Utc};
use hmac::{Hmac, Mac, NewMac};
use once_cell::sync::Lazy;
// notice this is percent_encoding=1.0.1 since I haven't bothered to 
// fix this for latter versions of the crate.
use percent_encoding::{define_encode_set, utf8_percent_encode, SIMPLE_ENCODE_SET};
use sha2::{Digest, Sha256};
use std::env;
use std::fmt::Write;

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Apple provides CTFontCopyDefaultCascadeListForLanguages to get a set of fallback font names for a certain ISO language code. I want to know how much these vary.

main.swift is a quick hack to dump a JSON of all codes with the fallbacks. The test assumes Menlo 12.0 as the starting point.

output.json is the full output from running the swift hack.

Finally I used nodejs to crunch the json to buckets that have different lists of fallbacks. code is in crunch.js

buckets.json has the result of running the crunch.

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# propagate titles to the window
set -g set-titles on

# Minimalist window title "0:bash"
set -g set-titles-string "#I:#W"

# show colors
set -g default-terminal "screen-256color"

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# TMUX
# test if tmux is available
if type tmux >/dev/null 2>&1; then
    # if not inside a tmux session, and if no session is started, start a new session
    # I only want this on my mac laptop.
    if [ -z "$TMUX" -a `uname` == Darwin ]; then
        # attach to session "martin" if there
        exec tmux -2 -f  ~/.tmux-osx.conf new-session -A -s martin
    fi
fi

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# Stateful
class MyComponent extends React.Component

  constructor: (props) ->
    super
    
  render: =>
    div class:'mycomponent', ->
      span 'Hej'

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const MyThing = () => {
  return _react2.default.createElement('div', 
    _react2.default.createElement(Title), 
    _react2.default.createElement(Counter, {panda:42}),
    _react2.default.createElement(ButtonCounterInc),
    _react2.default.createElement(ButtonTitle)
  );
};

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Rust type conversions String, &str, Vec and &[u8]

From &str

• &str -> String has [many equally valid methods][stringh]: String::from(st), st.to_string(), st.to_owned().
  • But I suggest you stick with one of them within a single project. The major advantage of String::from is that you can use it as an argument to a map method. So instead of x.map(|s| String::from(s)) you can often use x.map(String::from).
• &str -> &[u8] is done by st.as_bytes()
• &str -> Vec<u8> is a combination of &str -> &[u8] -> Vec<u8>, i.e. st.as_bytes().to_owned()

From String