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Buildroot flavored SnapOS

Buildroot based embedded Linux OS for Snapcast. There are configurations for some boards, e.g. the Raspberry Pi 3 with WiFi and audio enabled, as well as packages for Snapcast and its dependencies.

How-to

  1. Download or clone Buildroot
  2. Clone SnapOS to some directory
  3. Navigate into Buildroot's root directory and define SnapOS as an external:
buildroot-2019.11 $ make BR2_EXTERNAL=/PATH/TO/snapos/buildroot-external/ snapos_rpi3_defconfig

To build out of tree, add O=/PATH/TO/BUILD/DIR and continue in this directory
4. Now you will find the pre-selected Snapclient package under External options ---> in make menuconfig

    *** Snapcast OS (in /PATH/TO/snapos/buildroot-external) ***
[*] Snapcast
[*]   Snapclient
[ ]   Snapserver
  1. Run make, wait, and find the image in image/sdcard.img
  2. Write the image to an sd card, e.g. (with sdX = your sd card's device name):
buildroot-2019.11 $ sudo dd bs=4M if=output/images/sdcard.img of=/dev/sdX conv=fsync status=progress
  1. Boot your device. Snapclient will start automatically (make sure that /etc/default/snapclient contains the line START_SNAPCLIENT=true)
  2. Ethernet is configured to use DHCP. Login with user root and password snapcast

WiFi

To enable WiFi, add your WiFi's SSID and password to /etc/wpa_supplicant.conf:

ctrl_interface=/var/run/wpa_supplicant
ap_scan=1

network={
    ssid="<Your SSID>"
    psk="<Your Key>"
}

External DAC

You can activate support for external DACs by loading the appropriate device tree:

1. Remove the driver for the onboard sound

Remove the line from /boot/config.txt:

dtparam=audio=on

2. Configure device tree overlay file

add your DAC's device tree (e.g. hifiberry-dacplus) to /boot/config.txt:

dtoverlay=<your DAC's device tree>