Snapcast client for ESP32

Synchronous Multiroom audio streaming client for Snapcast ported to ESP32

Feature list

Opus decoding currently supported
Wifi connection hardcoded in app
Auto connect to snapcast server on network
Buffers up to 150 ms on Wroom modules
Buffers more then enough on Wrover modules
Multiroom sync delay controlled from Snapcast server

Description

I have continued the work from @badaix and @bridadan towards a ESP32 Snapcast client. Currently it support basic features like multirum sync, network controlled volume and mute. For now it only support Opus 16bit/48Khz audio streams and the synchornization part is still being worked on.

Please check out the task list and feel free to fill in.

I have used the Infineon MA12070P Multi level Class D combined coded/amp due to its superior power effecienty on a high supply rail. It allow me to battery power system with good play back time at normal listen level and stil have the power to start the party.

The codebase is split into components and build on vanilla ESP-IDF. I stil have some refactoring on the todo list as the concept has started to settle and allow for new features can be added in a stuctured manner. In the code you will find parts that are only partly related features and still not on the task list. Components

MerusAudio : Low level communication interface MA12070P
opus : Opus audio coder/decoder full submodule
rtprx : Alternative RTP audio client UDP low latency also opus based
lightsnapcast : Port of @bridadan scapcast packages decode library
libbuffer : Generic buffer abstraction
esp-dsp : Port of ESP-DSP library - stripped version - submodule considered
dsp_processor : Audio Processor and I2S low level interface including sync buffer

Build

Clone this repo:

git clone https://github.com/jorgenkraghjakobsen/snapclint

Update third party code:

git submodule update --init

Configure to match your setup:

Wifi network name and password
Audio coded setup

Build, compile and flash:

idf.py build flash monitor

Test

Setup a snapcast server on your network

On a linux box:

Clone snapcast build and start the server

./snapserver

Pipe some audio to the snapcast server fifo

mplayer http://ice1.somafm.com/secretagent-128-aac -ao pcm:file=/tmp/snapfifo -af format=s16LE -srate 48000

Test the server config on other knowen platform

./snapclient  from the snapcast repo

Android : snapclient from the app play store

Task list

[ok] Fix to alinge with above

kconfig
add codec description

Integrate ESP wifi provision
[ok] Find and connect to Avahi broadcasted Snapcast server name
Add a client command interface layer like volume/mute control
Build a ESP-ADF branch

Minor task

Propergate mute/unute from server message to DSP backend mute control.
- soft mute - play sample in buffer with decresing volume
- [ok] hard mute - pass on zero at the DSP hackend
Startup: do not start parsing on samples to codec before sample ring buffer hits requested buffer size.
- [ok] Start from empty buffer

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