MycroftOS: Addition of Snapcast; Both client and server.

- Configuration opts are in /etc/snapcast/
- Server configuration in /etc/snapcast.conf
- NOT enabled by default, can be started/enabled by;
  sudo systemctl start/enable snapclient.service
  sudo systemctl start/emable snapserver.service

buildroot-external/Config.in

@@ -10,6 +10,7 @@ menu "Additional drivers, libraries and/or applications"
 	source "$BR2_EXTERNAL_MYCROFTOS_PATH/package/btspeaker/Config.in"
 	source "$BR2_EXTERNAL_MYCROFTOS_PATH/package/fann/Config.in"
 	source "$BR2_EXTERNAL_MYCROFTOS_PATH/package/respeaker/Config.in"
+	source "$BR2_EXTERNAL_MYCROFTOS_PATH/package/snapcast/Config.in"
 	source "$BR2_EXTERNAL_MYCROFTOS_PATH/package/spotifyd/Config.in"
 endmenu
 menu "Additional external python modules"

buildroot-external/configs/rpi3_defconfig

@@ -61,7 +61,6 @@ BR2_PACKAGE_FFMPEG_FFPLAY=y
 BR2_PACKAGE_FFMPEG_FFPROBE=y
 BR2_PACKAGE_FFMPEG_AVRESAMPLE=y
 BR2_PACKAGE_FFMPEG_POSTPROC=y
-BR2_PACKAGE_FLAC=y
 BR2_PACKAGE_MIMIC=y
 BR2_PACKAGE_MIMIC_AUDIO_BACKEND_ALSA=y
 BR2_PACKAGE_MPG123=y
@@ -250,8 +249,6 @@ BR2_PACKAGE_PCRE_16=y
 BR2_PACKAGE_PCRE_32=y
 BR2_PACKAGE_PCRE2_16=y
 BR2_PACKAGE_PCRE2_32=y
-BR2_PACKAGE_AVAHI=y
-BR2_PACKAGE_AVAHI_DAEMON=y
 BR2_PACKAGE_AVAHI_LIBDNSSD_COMPATIBILITY=y
 BR2_PACKAGE_BLUEZ_TOOLS=y
 BR2_PACKAGE_BLUEZ5_UTILS=y
@@ -322,6 +319,8 @@ BR2_PACKAGE_ALSA_PLUGINS=y
 BR2_PACKAGE_BTSPEAKER=y
 BR2_PACKAGE_FANN=y
 BR2_PACKAGE_RESPEAKER=y
+BR2_PACKAGE_SNAPCAST=y
+BR2_PACKAGE_SNAPCAST_SERVER=y
 BR2_PACKAGE_SPOTIFYD=y
 BR2_PACKAGE_PYTHON_ADAPT_PARSER=y
 BR2_PACKAGE_PYTHON_COLORZERO=y

buildroot-external/package/snapcast/Config.in

@@ -0,0 +1,37 @@
+config BR2_PACKAGE_SNAPCAST
+	bool "snapcast"
+	depends on BR2_USE_MMU # avahi
+	depends on !BR2_STATIC_LIBS # avahi
+	depends on BR2_TOOLCHAIN_HAS_THREADS
+	depends on BR2_INSTALL_LIBSTDCPP
+	select BR2_PACKAGE_AVAHI
+	select BR2_PACKAGE_AVAHI_DAEMON
+	select BR2_PACKAGE_BOOST
+	select BR2_PACKAGE_DBUS
+	select BR2_PACKAGE_FLAC
+	select BR2_PACKAGE_LIBVORBIS
+	select BR2_PACKAGE_OPUS
+	help
+	  Synchronous multi-room audio player
+	  
+	  https://github.com/badaix/snapcast
+
+if BR2_PACKAGE_SNAPCAST
+
+config BR2_PACKAGE_SNAPCAST_CLIENT
+	bool "Snapclient"
+	default y
+	help
+	  Snapcast client
+
+config BR2_PACKAGE_SNAPCAST_SERVER
+	bool "Snapserver"
+	help
+	  Snapcast server
+
+endif
+
+comment "Snapcast needs a toolchain w/ C++, threads, dynamic library"
+	depends on BR2_USE_MMU
+	depends on !BR2_INSTALL_LIBSTDCPP || !BR2_TOOLCHAIN_HAS_THREADS \
+		|| BR2_STATIC_LIBS

buildroot-external/package/snapcast/snapcast.mk

@@ -0,0 +1,69 @@
+################################################################################
+#
+# snapcast
+#
+################################################################################
+
+SNAPCAST_VERSION = v0.17.1
+SNAPCAST_SITE = $(call github,badaix,snapcast,$(SNAPCAST_VERSION))
+SNAPCAST_DEPENDENCIES = libogg alsa-lib avahi # libstdcpp libatomic libflac libvorbisidec
+SNAPCAST_LICENSE = GPL-3.0+
+SNAPCAST_LICENSE_FILES = LICENSE
+
+define SNAPCLIENT_INSTALL_CONFIG
+	mkdir -p $(TARGET_DIR)/etc/snapcast
+	$(INSTALL) -m 0755 -D $(@D)/debian/snapclient.default $(TARGET_DIR)/etc/snapcast/snapclient
+endef
+
+
+define SNAPSERVER_INSTALL_CONFIG
+	mkdir -p $(TARGET_DIR)/etc/snapcast
+	$(INSTALL) -m 0755 -D $(@D)/debian/snapserver.default $(TARGET_DIR)/etc/snapcast/snapserver
+	$(INSTALL) -m 0755 -D $(@D)/server/etc/snapserver.conf $(TARGET_DIR)/etc/
+endef
+
+
+ifeq ($(BR2_PACKAGE_SNAPCAST_CLIENT),y)
+SNAPCAST_POST_INSTALL_TARGET_HOOKS += SNAPCLIENT_INSTALL_CONFIG
+
+define SNAPCLIENT_INSTALL_INIT_SYSV
+	$(INSTALL) -m 0755 -D $(SNAPCAST_PKGDIR)/S99snapclient $(TARGET_DIR)/etc/init.d/S99snapclient
+endef
+
+define SNAPCLIENT_INSTALL_INIT_SYSTEMD
+	$(INSTALL) -D -m 0644 $(BR2_EXTERNAL_MYCROFTOS_PATH)/package/snapcast/snapclient.service \
+		$(TARGET_DIR)/usr/lib/systemd/system/snapclient.service
+endef
+else # !BR2_PACKAGE_SNAPCAST_CLIENT
+	SNAPCAST_CONF_OPTS += -DBUILD_CLIENT=OFF
+endif
+
+
+ifeq ($(BR2_PACKAGE_SNAPCAST_SERVER),y)
+SNAPCAST_POST_INSTALL_TARGET_HOOKS += SNAPSERVER_INSTALL_CONFIG
+
+define SNAPSERVER_INSTALL_INIT_SYSV
+	$(INSTALL) -m 0755 -D $(SNAPCAST_PKGDIR)/S99snapserver $(TARGET_DIR)/etc/init.d/S99snapserver
+endef
+
+define SNAPSERVER_INSTALL_INIT_SYSTEMD
+	$(INSTALL) -D -m 0644 $(BR2_EXTERNAL_MYCROFTOS_PATH)/package/snapcast/snapserver.service \
+		$(TARGET_DIR)/usr/lib/systemd/system/snapserver.service
+endef
+else # !BR2_PACKAGE_SNAPCAST_SERVER
+	SNAPCAST_CONF_OPTS += -DBUILD_SERVER=OFF
+endif
+
+
+define SNAPCAST_INSTALL_INIT_SYSTEMD
+	$(SNAPCLIENT_INSTALL_INIT_SYSTEMD)
+	$(SNAPSERVER_INSTALL_INIT_SYSTEMD)
+endef
+
+define SNAPCAST_INSTALL_INIT_SYSV
+	$(SNAPCLIENT_INSTALL_INIT_SYSV)
+	$(SNAPSERVER_INSTALL_INIT_SYSV)
+endef
+
+
+$(eval $(cmake-package))

buildroot-external/package/snapcast/snapclient.service

@@ -0,0 +1,15 @@
+[Unit]
+Description=Snapcast client
+Documentation=man:snapclient(1)
+Wants=avahi-daemon.service
+After=network.target time-sync.target sound.target avahi-daemon.service
+
+[Service]
+EnvironmentFile=-/etc/snapcast/snapclient
+ExecStart=/usr/bin/snapclient $SNAPCLIENT_OPTS
+# very noisy on stdout
+StandardOutput=null
+Restart=on-failure
+
+[Install]
+WantedBy=multi-user.target

buildroot-external/package/snapcast/snapserver.service

@@ -0,0 +1,13 @@
+[Unit]
+Description=Snapcast server
+Documentation=man:snapserver(1)
+Wants=avahi-daemon.service
+After=network.target time-sync.target avahi-daemon.service
+
+[Service]
+EnvironmentFile=-/etc/snapcast/snapserver
+ExecStart=/usr/bin/snapserver $SNAPSERVER_OPTS
+Restart=on-failure
+
+[Install]
+WantedBy=multi-user.target