Prototyping/2019-2020/T3

From XPUB & Lens-Based wiki

Prototyping session Spring 2020, in the context of Special Issue #12: Radio Implicancies

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01

In the work for the Special Issue, we will employ a strategy of working between systems

Proposition is to publish prototyping work alongside other developments of the Special Issue in a rolling fashion, ie following an "early and often" approach to publishing.

Focus on using the wiki as a "cookbook" -- a place to record useful techniques for others.

.gitignore

We will follow a "sources only" approach to using the git whereby only "source" files will get committed to a repo. The idea is that the tools are in place for anyone who clones the directory to "build" the other files using the makefile + tools.

For this reason the .gitignore file contains:

*.html

So that if you try to:

git add README.html

You will see:

The following paths are ignored by one of your .gitignore files:
README.html
Use -f if you really want to add them.


(why) make radio

Why use make? Makefiles are like "executable notebooks" are a really effective (and time tested) way to document and share scripts, workflows, and workarounds using diverse tools.

What's the catch? Make comes from free software programming culture and was created to support programming work rather than publishing. However, as managing programmers is like "herding cats", the tool is extremely flexible and porous, and well integrated with the command-line and BASH scripting. As such it's compatible with the richness of command-line tools available.

practical to do's

  • Update issue.xpub.nl to point http://issue.xpub.nl/12/ to (redirect to?) The working space of SI12.
  • Understand and make use of the git & make based workflow.
  • Familiarity using liquidsoap to create icecast streams.
  • Use liquidsoap to create flexible streams that can be interrupted
  • Use top to check the load on the sandbox
  • Use liquidsoap as an editing tool to assemble, mix, and filter audio
  • Explore some basic structural elements of liquidsoap (playlist, rotate, sequence).

Make Noise

Live or Fallback

  • liquidsoap fallbacks
  • mixing diverse sources of material...
  • working with silence
  • dynamics compression and loudness
  • test streaming to an interruptable mount point...

Mixing audio sources

resources:

Question relevant to the special issue: Are we streaming in stereo / mono? At what bitrate... Does it matter?

Assignment(s) for next week

  • Make a "self-referential" radio program with liquidsoap... that is one where the content and the material of its transmission and its tools of production are reflected.
  • Document your use of liquidsoap, or other tool(s) in the xpub wiki in the style of a (code) "Cookbook" recipe.

Listen together

Listen with wget + liquidsoap

02

VOICE

  • text to speech / speech synthesis

Specifically the case of [MBROLA](https://github.com/numediart/MBROLA) and the "free" but not "libre" voices. https://github.com/numediart/MBROLA-voices

Espeak + MBrola https://github.com/espeak-ng/espeak-ng/blob/master/docs/mbrola.md

Projects spɛl ænd spik. hellocatfood (antonio roberts) https://www.hellocatfood.com/spell-and-speak/

"real" VOICES http://librivox.org

  • microphones

HRTF

03

PLAYER

Radio webpage

(meta/way of working Publishing via git/githook TRY! )

  • random access media ?? (can an mp3 do a range request jump? or only ogg ??) depends on server, example of non-random access mp3
  • ubu audio player as anti-pattern ?!
  • html5 media fragments, and javascript

04

BOTS

Cross system / bots (2 parts?)

  • infobot
  • eliza
  • mud/moo
  • Bot / chatroom
  • Radio stream / schedule
  • mediawiki API (pull + push) .. example of epicpedia?
  • etherpad API (pull + push?) .. example of etherlamp (make js version?)

See: https://vnsmatrix.net/projects/corpusfantastica-moo-and-lambda-projects

05

PLEASE Leave a message

06

  • gitea webhooks
  • CGI to receive a JSON post
  • php to receive JSON post (example on gitea webhooks page)
  • CGI (making a "helloworld" / printenv with python) See CGI checklist
  • Don't forget "sudo a2enmod cgi" and "sudo systemctl restart apache2" to enable the cgi module in Apache...

MIDI