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Cog

Cog is an rust program which uses the Jack Audio Connection Kit to play sound. It relies on the crate rusty-jack(https://github.com/psantacl/rusty-jack) for its interop with Jack.

Building

  1. Install the Jack Audio Connection Kit server
  2. Clone the rusty-jack create and build with make
  3. Copy the crate's build artifact (librusty_jackdylib) into the cog's libs directory
  4. make && ./bin/cog

Fun

Cog will connect to a runner Jack server. You can use the JackPilot which comes with the Jack to connect the Cog application to whatever output you wish: Speakers, Logic Audio etc.

Cog also creates a named fifo under /tmp/cog-in. Any data you pipe through that fifo will be interpretted as audio data and played: cat snd-files/the-sound-of-silence-f32.wav > /tmp/cog-in Note, there is nothing stopping you from sending non-audio data into this pipe as well: dd if=/dev/urandom of=/tmp/cog-in bs=44100 count=100

Playback Algorithms

Cog can optionally manipulate the data it receives prior to sending it to Jack. Descriptions of some of the algorithm are below:

  • Clean: Interpret all data as 32 bit floats. Any samples outside of the audio range(-1.0 ... 1.0) will be brought into the aforemention range.
  • Bit Reduce: Interpret all data as 32 bit floats and then bit reduce them by XOR the mantissa. The result is distortion.
  • Stutter: Emulate CD skipping by probabilistically stuttering the output.