SqueezeDSP

This is a plugin for Squeezebox server which will allow DSP to be run on the server.

Features

Processing is designed for mono or Stereo signals and can be configured on a per play basis including disabling DSP for specific players. Audio formats supported - includes a custom converstion profile for the following formats: aac, aif, alc, alcx, ape, flc, mov, mp3, mp4, mp4x, mpc, ogg, ogf, ops, spt, wav, wma, wmal, wmap, wvp

DSD, MQA are not supported

Streaming from Qobuz works with the limitation that skipping/pausing within a track will cause the player to move onto the next track.

depending upon player output is 24 bit flac or 16 bit wav file

The plugin has been tested on windows 10, pi 3B, docker, Ubuntu via VirtualBox and MacOS via VirtualBox

There are performance limitations on a pi 3B with dropouts occurring at 96k sampling and above.

Save and Load Presets Impulse convolution via pre-generated impulse files clipping meter - which keeps shows an indicator for the last tracks played Preamp (gain reduction only) Delay - one channel in ms Balance Width (boost apparent stereo width) Loudness - Volume compensation control multi-band peaking filter (freq, gain, Q) Seperate filters for High Pass, Low Shelf, High Shelf and Low Pass

Facility to load in text filters directly from REW.

Planned Changes

Amend PEQ filters so that the interface is unified - filter type will be a parameter when creating a new filter. Add in a visualiser port code to .net core 8 to further reduce binary size and improve performance

Potential changes

Gain override - allow gain to be above 0 DB. Support crossover design Support multi-channel audio re-write processor in Rust