PeppyMeter and moOde

[Tim Curtis]

Couple things.

1. Moode uses the ALSA Loopback device to provide a copy of the PCM output stream to other applications.
2. ALSA Loopback requires the source to be PCM format. It does not support native DSD bitstream. This means that MPD must be set to "DSD over PCM (DoP) and the DAC has to support DoP.
3. Loopback works with ALSA output modes: Default (plughw) or ALSA Direct (hw). The mode has to be set before turning Loopback on.

I don't have any experience with PeppyMeter but I think it requires the source to be PCM format which means DSD would need to be converted to PCM (not DoP) in order for the meters to correctly reflect the waveform.

If I get a few spare cycles I'll try out the excellent guide from @fdealexa and get some experience with PeppyMeter.

It's quite beautiful and compliments to the creator of PeppyMeter :-)

   

There's a simplified ALSA config that doesn't need Loopback and it works with CamillaDSP in the pipeline for both PCM and DSD format (MPD auto-converts DSD to PCM). 

- It also works without CamillaDSP but only for PCM format. DSD throws an ALSA error.
- The moode ALSA chain for renderers doesn't work.
- It takes expertise and tooling (image editor) to create the meter image layers, needle and screen background for a given display resolution. 

The attached image is for my 1920x1080 WIMAXIT 10.1" HDMI display. The meters are stock peppy 1280x400 edited to 1280x460 (to cover the white needle origins), a 1280x460x60 semi-transparent foreground to cover the needle bottoms and a 1280x720 background with the moode text.