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Add MPD with its corresponding services.

pull/431/head
piradio 2019-06-15 15:52:52 +02:00
parent 92373e8d27
commit 06ce146fd8
14 changed files with 677 additions and 30 deletions
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README.md merge=ours

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[submodule "stage2/04-pirate-radio/files/pivumeter"]
path = stage2/04-pirate-radio/files/pivumeter
url = https://github.com//pivumeter

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# Piradio
Piradio is the image that you need to burn on your SD card in order for your Pirate Radio to work.
Piradio powers a streaming internet radio client for the "Pirate Radio" hardware sold by Pimoroni: https://shop.pimoroni.com/products/pirate-radio-pi-zero-w-project-kit
or any kit based on their Phat Beat DAC / Audio Amplifier and a Raspberry Pi.
Pirate Radio here refers to the product sold by Pimoroni here: https://shop.pimoroni.com/products/pirate-radio-pi-zero-w-project-kit
Piradio specifically implements the internet radio project described here: https://github.com/pimoroni/phat-beat/tree/master/projects/vlc-radio
## motivation
The official documentation from Pimoroni suggest that you install the operating system and then execute some scripts on there to install the project.
I personally find it more convenient when it comes to embedded devices to just burn an image to an SD card.
## how it is built
The image is built with the official RaspberryPi.org tool (https://github.com/RPi-Distro/pi-gen) and the official scripts from Pimoroni (https://github.com/pimoroni/phat-beat/tree/master/projects/vlc-radio) adapted to work together.
Nothing has been changed or otherwise improved from the original scripts, so the image you get here is the same as if you would install it the official way.
Features are the ones provided by [mpd](https://github.com/MusicPlayerDaemon/MPD):
- it retains the radio station that was playing after turning off / on the device and also the volume.
- it has a number of interfaces, currently on this image there is a web interface and a console one.
- managing your radio stations can be done from the interface (`add stream` and delete buttons).
- physical buttons do what is expected of them
- LEDs are used as a vumeter
## how to create the image
- First clone this repository with `git clone --recursive git@github.com:pirateradiohack/PiRadio.git`.
(Please note the `--recursive` here is important to get all the code, there is a submodule present.)
- Configure your radio stations: Pimoroni maintains a set of default internet radio streams. You can see them in the file `example.m3u`. This file will be installed if nothing else is supplied. If you create a file called `my-playlist.m3u` with your own list of internet radio streams, this file will be used instead.
- Configure your wifi settings: copy the file called `config.example` to `config` and edit this last one. You will see where to enter your wifi name, password and country. All 3 settings are necessary.
- Then build the image. (You can see the whole guide on the official RaspberryPi repo: https://github.com/RPi-Distro/pi-gen). I find it easier to use docker as there is nothing else to install, just run one command from this directory: `./build-docker.sh`. That's it. On my computer it takes between 15 and 30 minutes. And at the end you should see something like: `Done! Your image(s) should be in deploy/`
- First clone this repository with `git clone git@github.com:pirateradiohack/PiRadio.git`.
- Configure your radio stations: If you create a file called `my-playlist.m3u` with your own list of internet radio streams, it will be installed.
If not, then you can always add stations in the web interface.
- Configure your wifi settings: copy the file called `config.example` to `config` and edit this last one. You will see where to enter your wifi name, password and country. All 3 settings are necessary. Your changes to this file will be kept in future updates.
- Then build the image. (You can see the whole guide on the official RaspberryPi repo: https://github.com/RPi-Distro/pi-gen). I find it easier to use docker (obviously you need to have docker installed on your system) as there is nothing else to install, just run one command from this directory: `./build-docker.sh`. That's it. On my computer it takes between 15 and 30 minutes. And at the end you should see something like: `Done! Your image(s) should be in deploy/`
If you don't see that, it's probably that the build failed. It happens to me sometimes for no reason and I find that just re-launching the build with `CONTINUE=1 ./build-docker.sh` finishes the build correctly.
## burn the image to a SD card
You should find the newly created image in the `deploy` directory. On linux an example to get it on the SD card would be:
You should find the newly created image in the `deploy` directory.
### graphically
For a user friendly experience you can try [etcher](https://www.balena.io/etcher/) to flash the image to the SD card.
### manually
On linux (and it probably works on Mac too) an example to get it on the SD card would be:
`sudo dd bs=4M if=deploy/2019-05-23-Piradio-lite.img of=/dev/mmcblk0 conv=fsync`
(of course you need to replace `/dev/mmcblk0` with the path to your own SD card. You can find it with the command `lsblk -f`)
Those settings are recommended by the RaspberryPi instructions.
## controlling your radio via web interface
You can control your radio via web interface: find its IP and in your browser enter `http://[IP of your radio]:8080` with no username and password `raspberry`.
You can control your radio via web interface: try to open `http://radio.local` in a web browser. If that does not work then find its IP and in your browser enter `http://[IP of your radio]`.
If you prefer the command line, you can ssh into your radio (you need to set that up in the `config` file before building the image) and then use `ncmpcpp` to get a nice terminal interface (see some screenshots here: https://rybczak.net/ncmpcpp/screenshots/).
## ready-to-flash image
Out of security concerns I recommend you read the [code](https://github.com/RPi-Distro/pi-gen/compare/master...pirateradiohack:master) and build the image yourself.
But, if you prefer to trust a stranger on the Internet with your Pirate Radio, for your convenience you will find the latest image pre-compiled here: [2019-05-23-Piradio-lite.img](https://github.com/pirateradiohack/PiRadio/releases/download/2019-05-23-PiRadio/2019-05-23-Piradio-lite.img) . Just flash it
But, if you prefer to trust a stranger on the Internet with your Pirate Radio, for your convenience you will find the latest image pre-compiled here: [2019-05-23-Piradio-lite.img](https://github.com/pirateradiohack/PiRadio/releases/download/2019-06-15-PiRadio/2019-06-14-Piradio-lite.img) . Just flash it
and configure your wifi. You can also optionally configure your own radio streams playlist.
The files to edit are:
@ -49,3 +49,21 @@ With Linux you can use `kpartx` (from the `multipath-tools` package) to be able
(you will need to create the mount directory first and check what loop device you are using with `sudo kpartx -l path/to/2019-05-23-Piradio-lite.img`). Then you can edit the files mentionned above. And `sudo umount tmp`.
You are safe to flash the image.
- after flashing your operating system probably automounts the partitions.
## how it is built
The image is built with the official RaspberryPi.org tool (https://github.com/RPi-Distro/pi-gen) to build a Raspbian lite system with all the software needed
to have a working internet radio stream client. It uses `mpd`.
## motivation
The official documentation from Pimoroni has some instructions and examples to make an internet streaming client for the hardware: https://github.com/pimoroni/phat-beat/tree/master/projects/vlc-radio. It works fine and is a good source of inspiration.
But those examples assume an already installed OS and run some scripts on top of it.
I personally find it more convenient when it comes to embedded devices to just burn an image to an SD card.
Also, the provided software in the examples works fine, but comes in a format that I find hard to tinker with.
I tried to use an approach based on provisionning an image instead in order to make it a good ground for hacking.
The first version of this project used the official scripts from Pimoroni. If you want that, you can find it here: https://github.com/pirateradiohack/PiRadio/tree/2019-05-25-PiRadio
Issues and pull requests are welcome.

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@ -10,3 +10,11 @@ automake
libtool
libasound2-dev
libfftw3-dev
mpd
mpc
ncmpcpp
python3-setuptools
python3-systemd
cmake
libmpdclient-dev
libssl-dev

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#!/bin/bash -e
# set hostname
install -v -m 644 files/etc/hostname "${ROOTFS_DIR}/etc/"
install -v -m 644 files/etc/hosts "${ROOTFS_DIR}/etc/"
# pulseaudio
install -v -m 644 files/etc/systemd/system/pulseaudio.service "${ROOTFS_DIR}/etc/systemd/system/"
install -v -m 644 files/etc/pulse/client.conf "${ROOTFS_DIR}/etc/pulse/"
install -v -m 644 files/etc/pulse/default.pa "${ROOTFS_DIR}/etc/pulse/"
# pivumeter
cp -rf files/pivumeter "${ROOTFS_DIR}/root/"
install -v -m 644 files/pivumeter/dependencies/etc/asound.conf "${ROOTFS_DIR}/etc/"
git clone https://github.com/pimoroni/pivumeter.git "${ROOTFS_DIR}/root/pivumeter"
install -v -m 644 "${ROOTFS_DIR}/root/pivumeter/dependencies/etc/asound.conf" "${ROOTFS_DIR}/etc/"
# mpd
git clone https://github.com/Mic92/python-mpd2.git "${ROOTFS_DIR}/root/python-mpd2"
install -v -m 644 files/etc/mpd.conf "${ROOTFS_DIR}/etc/"
if [ -f ../../my-playlist.m3u ]; then
install -v -m 644 ../../my-playlist.m3u "${ROOTFS_DIR}/var/lib/mpd/playlists/my-playlist.m3u"
fi
# physical interface
install -v -m 644 files/etc/systemd/system/radio-interface.service "${ROOTFS_DIR}/etc/systemd/system/"
mkdir "${ROOTFS_DIR}/usr/local/lib/radio-interface/"
install -v -m 644 files/interface.py "${ROOTFS_DIR}/usr/local/lib/radio-interface/"
# web interface
install -v -m 644 files/etc/systemd/system/ympd.service "${ROOTFS_DIR}/etc/systemd/system/"
git clone https://github.com/notandy/ympd.git "${ROOTFS_DIR}/root/ympd"

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#!/bin/bash -e
# pulseaudio
systemctl enable pulseaudio
#pivumeter
cd /root/pivumeter
aclocal && libtoolize
autoconf && automake --add-missing
./configure && make
make install
# mpd
cd /root/python-mpd2
python3 setup.py install
# physical interface
useradd -r -s /bin/false radio-interface
adduser radio-interface gpio
echo 'radio-interface ALL=(ALL) NOPASSWD: /sbin/shutdown' > /etc/sudoers.d/010_radio-interface-shutdown
chmod 0440 /etc/sudoers.d/010_radio-interface-shutdown
systemctl enable radio-interface
# web interface
cd /root/ympd
mkdir build
cd build
cmake .. -DCMAKE_INSTALL_PREFIX:PATH=/usr
make
make install
systemctl enable ympd

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#!/bin/bash -e
# cleanup
rm -rf "${ROOTFS_DIR}/root/pivumeter"
rm -rf "${ROOTFS_DIR}/root/python-mpd2"
rm -rf "${ROOTFS_DIR}/root/ympd"

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radio

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127.0.0.1 localhost
::1 localhost ip6-localhost ip6-loopback
ff02::1 ip6-allnodes
ff02::2 ip6-allrouters
127.0.1.1 radio

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# An example configuration file for MPD.
# Read the user manual for documentation: http://www.musicpd.org/doc/user/
# or /usr/share/doc/mpd/user-manual.html
# Files and directories #######################################################
#
# This setting controls the top directory which MPD will search to discover the
# available audio files and add them to the daemon's online database. This
# setting defaults to the XDG directory, otherwise the music directory will be
# be disabled and audio files will only be accepted over ipc socket (using
# file:// protocol) or streaming files over an accepted protocol.
#
music_directory "/var/lib/mpd/music"
#
# This setting sets the MPD internal playlist directory. The purpose of this
# directory is storage for playlists created by MPD. The server will use
# playlist files not created by the server but only if they are in the MPD
# format. This setting defaults to playlist saving being disabled.
#
playlist_directory "/var/lib/mpd/playlists"
#
# This setting sets the location of the MPD database. This file is used to
# load the database at server start up and store the database while the
# server is not up. This setting defaults to disabled which will allow
# MPD to accept files over ipc socket (using file:// protocol) or streaming
# files over an accepted protocol.
#
db_file "/var/lib/mpd/tag_cache"
#
# These settings are the locations for the daemon log files for the daemon.
# These logs are great for troubleshooting, depending on your log_level
# settings.
#
# The special value "syslog" makes MPD use the local syslog daemon. This
# setting defaults to logging to syslog, otherwise logging is disabled.
#
log_file "/var/log/mpd/mpd.log"
#
# This setting sets the location of the file which stores the process ID
# for use of mpd --kill and some init scripts. This setting is disabled by
# default and the pid file will not be stored.
#
pid_file "/run/mpd/pid"
#
# This setting sets the location of the file which contains information about
# most variables to get MPD back into the same general shape it was in before
# it was brought down. This setting is disabled by default and the server
# state will be reset on server start up.
#
state_file "/var/lib/mpd/state"
#
# The location of the sticker database. This is a database which
# manages dynamic information attached to songs.
#
sticker_file "/var/lib/mpd/sticker.sql"
#
###############################################################################
# General music daemon options ################################################
#
# This setting specifies the user that MPD will run as. MPD should never run as
# root and you may use this setting to make MPD change its user ID after
# initialization. This setting is disabled by default and MPD is run as the
# current user.
#
user "mpd"
#
# This setting specifies the group that MPD will run as. If not specified
# primary group of user specified with "user" setting will be used (if set).
# This is useful if MPD needs to be a member of group such as "audio" to
# have permission to use sound card.
#
#group "nogroup"
#
# This setting sets the address for the daemon to listen on. Careful attention
# should be paid if this is assigned to anything other then the default, any.
# This setting can deny access to control of the daemon. Choose any if you want
# to have mpd listen on every address. Not effective if systemd socket
# activation is in use.
#
# For network
bind_to_address "localhost"
#
# And for Unix Socket
#bind_to_address "/run/mpd/socket"
#
# This setting is the TCP port that is desired for the daemon to get assigned
# to.
#
#port "6600"
#
# This setting controls the type of information which is logged. Available
# setting arguments are "default", "secure" or "verbose". The "verbose" setting
# argument is recommended for troubleshooting, though can quickly stretch
# available resources on limited hardware storage.
#
#log_level "default"
#
# If you have a problem with your MP3s ending abruptly it is recommended that
# you set this argument to "no" to attempt to fix the problem. If this solves
# the problem, it is highly recommended to fix the MP3 files with vbrfix
# (available as vbrfix in the debian archive), at which
# point gapless MP3 playback can be enabled.
#
#gapless_mp3_playback "yes"
#
# Setting "restore_paused" to "yes" puts MPD into pause mode instead
# of starting playback after startup.
#
#restore_paused "no"
#
# This setting enables MPD to create playlists in a format usable by other
# music players.
#
#save_absolute_paths_in_playlists "no"
#
# This setting defines a list of tag types that will be extracted during the
# audio file discovery process. The complete list of possible values can be
# found in the mpd.conf man page.
#metadata_to_use "artist,album,title,track,name,genre,date,composer,performer,disc"
#
# This setting enables automatic update of MPD's database when files in
# music_directory are changed.
#
#auto_update "yes"
#
# Limit the depth of the directories being watched, 0 means only watch
# the music directory itself. There is no limit by default.
#
#auto_update_depth "3"
#
###############################################################################
# Symbolic link behavior ######################################################
#
# If this setting is set to "yes", MPD will discover audio files by following
# symbolic links outside of the configured music_directory.
#
#follow_outside_symlinks "yes"
#
# If this setting is set to "yes", MPD will discover audio files by following
# symbolic links inside of the configured music_directory.
#
#follow_inside_symlinks "yes"
#
###############################################################################
# Zeroconf / Avahi Service Discovery ##########################################
#
# If this setting is set to "yes", service information will be published with
# Zeroconf / Avahi.
#
#zeroconf_enabled "yes"
#
# The argument to this setting will be the Zeroconf / Avahi unique name for
# this MPD server on the network.
#
#zeroconf_name "Music Player"
#
###############################################################################
# Permissions #################################################################
#
# If this setting is set, MPD will require password authorization. The password
# can setting can be specified multiple times for different password profiles.
#
#password "password@read,add,control,admin"
#
# This setting specifies the permissions a user has who has not yet logged in.
#
#default_permissions "read,add,control,admin"
#
###############################################################################
# Database #######################################################################
#
#database {
# plugin "proxy"
# host "other.mpd.host"
# port "6600"
#}
# Input #######################################################################
#
input {
plugin "curl"
# proxy "proxy.isp.com:8080"
# proxy_user "user"
# proxy_password "password"
}
#
###############################################################################
# Audio Output ################################################################
#
# MPD supports various audio output types, as well as playing through multiple
# audio outputs at the same time, through multiple audio_output settings
# blocks. Setting this block is optional, though the server will only attempt
# autodetection for one sound card.
#
audio_output {
type "pulse"
name "MPD"
server "127.0.0.1"
}
#
# An example of an ALSA output:
#
#audio_output {
# type "alsa"
# name "My ALSA Device"
# device "hw:0,0" # optional
# mixer_type "hardware" # optional
# mixer_device "default" # optional
# mixer_control "PCM" # optional
# mixer_index "0" # optional
#}
#
# An example of an OSS output:
#
#audio_output {
# type "oss"
# name "My OSS Device"
# device "/dev/dsp" # optional
# mixer_type "hardware" # optional
# mixer_device "/dev/mixer" # optional
# mixer_control "PCM" # optional
#}
#
# An example of a shout output (for streaming to Icecast):
#
#audio_output {
# type "shout"
# encoder "vorbis" # optional
# name "My Shout Stream"
# host "localhost"
# port "8000"
# mount "/mpd.ogg"
# password "hackme"
# quality "5.0"
# bitrate "128"
# format "44100:16:1"
# protocol "icecast2" # optional
# user "source" # optional
# description "My Stream Description" # optional
# url "http://example.com" # optional
# genre "jazz" # optional
# public "no" # optional
# timeout "2" # optional
# mixer_type "software" # optional
#}
#
# An example of a recorder output:
#
#audio_output {
# type "recorder"
# name "My recorder"
# encoder "vorbis" # optional, vorbis or lame
# path "/var/lib/mpd/recorder/mpd.ogg"
## quality "5.0" # do not define if bitrate is defined
# bitrate "128" # do not define if quality is defined
# format "44100:16:1"
#}
#
# An example of a httpd output (built-in HTTP streaming server):
#
#audio_output {
# type "httpd"
# name "My HTTP Stream"
# encoder "vorbis" # optional, vorbis or lame
# port "8000"
# bind_to_address "0.0.0.0" # optional, IPv4 or IPv6
# quality "5.0" # do not define if bitrate is defined
# bitrate "128" # do not define if quality is defined
# format "44100:16:1"
# max_clients "0" # optional 0=no limit
#}
#
# An example of a pulseaudio output (streaming to a remote pulseaudio server)
# Please see README.Debian if you want mpd to play through the pulseaudio
# daemon started as part of your graphical desktop session!
#
#audio_output {
# type "pulse"
# name "My Pulse Output"
# server "remote_server" # optional
# sink "remote_server_sink" # optional
#}
#
# An example of a winmm output (Windows multimedia API).
#
#audio_output {
# type "winmm"
# name "My WinMM output"
# device "Digital Audio (S/PDIF) (High Definition Audio Device)" # optional
# or
# device "0" # optional
# mixer_type "hardware" # optional
#}
#
# An example of an openal output.
#
#audio_output {
# type "openal"
# name "My OpenAL output"
# device "Digital Audio (S/PDIF) (High Definition Audio Device)" # optional
#}
#
## Example "pipe" output:
#
#audio_output {
# type "pipe"
# name "my pipe"
# command "aplay -f cd 2>/dev/null"
## Or if you're want to use AudioCompress
# command "AudioCompress -m | aplay -f cd 2>/dev/null"
## Or to send raw PCM stream through PCM:
# command "nc example.org 8765"
# format "44100:16:2"
#}
#
## An example of a null output (for no audio output):
#
#audio_output {
# type "null"
# name "My Null Output"
# mixer_type "none" # optional
#}
#
# If MPD has been compiled with libsamplerate support, this setting specifies
# the sample rate converter to use. Possible values can be found in the
# mpd.conf man page or the libsamplerate documentation. By default, this is
# setting is disabled.
#
#samplerate_converter "Fastest Sinc Interpolator"
#
###############################################################################
# Normalization automatic volume adjustments ##################################
#
# This setting specifies the type of ReplayGain to use. This setting can have
# the argument "off", "album", "track" or "auto". "auto" is a special mode that
# chooses between "track" and "album" depending on the current state of
# random playback. If random playback is enabled then "track" mode is used.
# See <http://www.replaygain.org> for more details about ReplayGain.
# This setting is off by default.
#
#replaygain "album"
#
# This setting sets the pre-amp used for files that have ReplayGain tags. By
# default this setting is disabled.
#
#replaygain_preamp "0"
#
# This setting sets the pre-amp used for files that do NOT have ReplayGain tags.
# By default this setting is disabled.
#
#replaygain_missing_preamp "0"
#
# This setting enables or disables ReplayGain limiting.
# MPD calculates actual amplification based on the ReplayGain tags
# and replaygain_preamp / replaygain_missing_preamp setting.
# If replaygain_limit is enabled MPD will never amplify audio signal
# above its original level. If replaygain_limit is disabled such amplification
# might occur. By default this setting is enabled.
#
#replaygain_limit "yes"
#
# This setting enables on-the-fly normalization volume adjustment. This will
# result in the volume of all playing audio to be adjusted so the output has
# equal "loudness". This setting is disabled by default.
#
#volume_normalization "no"
#
###############################################################################
# Character Encoding ##########################################################
#
# If file or directory names do not display correctly for your locale then you
# may need to modify this setting.
#
filesystem_charset "UTF-8"
#
# This setting controls the encoding that ID3v1 tags should be converted from.
#
id3v1_encoding "UTF-8"
#
###############################################################################
# SIDPlay decoder #############################################################
#
# songlength_database:
# Location of your songlengths file, as distributed with the HVSC.
# The sidplay plugin checks this for matching MD5 fingerprints.
# See http://www.c64.org/HVSC/DOCUMENTS/Songlengths.faq
#
# default_songlength:
# This is the default playing time in seconds for songs not in the
# songlength database, or in case you're not using a database.
# A value of 0 means play indefinitely.
#
# filter:
# Turns the SID filter emulation on or off.
#
#decoder {
# plugin "sidplay"
# songlength_database "/media/C64Music/DOCUMENTS/Songlengths.txt"
# default_songlength "120"
# filter "true"
#}
#
###############################################################################

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[Unit]
# Human readable name of the unit
Description=controller for the radio buttons and LEDs
[Service]
# Command to execute when the service is started
ExecStart=/usr/bin/python3 /usr/local/lib/radio-interface/interface.py
# Disable Python's buffering of STDOUT and STDERR, so that output from the
# service shows up immediately in systemd's logs
Environment=PYTHONUNBUFFERED=1
# Automatically restart the service if it crashes
Restart=on-failure
# Our service will notify systemd once it is up and running
Type=notify
# Use a dedicated user to run our service
# User=radio-interface
[Install]
# Tell systemd to automatically start this service when the system boots
# (assuming the service is enabled)
WantedBy=default.target

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[Unit]
Description=ympd server daemon
Requires=network.target local-fs.target
[Service]
Environment=MPD_HOST=localhost
Environment=MPD_PORT=6600
Environment=WEB_PORT=80
Environment=YMPD_USER=nobody
ExecStart=/usr/bin/ympd --user $YMPD_USER --webport $WEB_PORT --host $MPD_HOST --port $MPD_PORT
Type=simple
[Install]
WantedBy=multi-user.target

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stage2/04-pirate-radio/files/interface.py Normal file
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"""This module is a systemd service that takes care of interfacing the
physical interaction devices (buttons, LEDs...) and the software of the
radio.
"""
import subprocess
import time
from contextlib import contextmanager
import phatbeat
import systemd.daemon
from mpd import MPDClient
from mpd.base import CommandError
HOST, PORT = 'localhost', 6600
VOLUME_STEP = 10
client = MPDClient()
@contextmanager
def connection_to_mpd():
"""Context manager to establish the connection with MPD.
Should be used for every use of the client since the connection is
sketchy.
"""
try:
client.connect(HOST, PORT)
yield
finally:
client.close()
client.disconnect()
# if the playlist is empty and an .m3u file has been provided then initialize
with connection_to_mpd():
if not client.playlist():
try:
client.load("my-playlist")
except(CommandError):
pass
# Make sure we are not in the stop position (does not affect pause)
# and make sure we are in repeat mode to avoid falling in the stopped
# position when we hit the end of the playlist by pushing next on the
# last radio station of the playlist.
with connection_to_mpd():
client.play()
client.repeat(1)
# all initialization is considered done after this point and we tell
# systemd that we are ready to serve
systemd.daemon.notify('READY=1')
@phatbeat.on(phatbeat.BTN_VOLDN)
def volume_down(pin):
"""Volume down button tells pulseaudio to step down the volume."""
command = """pactl
set-sink-volume
0
-{}%
""".format(VOLUME_STEP)
subprocess.run(command.split())
@phatbeat.on(phatbeat.BTN_VOLUP)
def volume_up(pin):
"""Volume up button tells pulseaudio to step up the volume."""
command = """pactl
set-sink-volume
0
+{}%
""".format(VOLUME_STEP)
subprocess.run(command.split())
@phatbeat.on(phatbeat.BTN_PLAYPAUSE)
def play_pause(pin):
"""Play/pause button tells MPD to toggle play/plause."""
with connection_to_mpd():
client.pause()
@phatbeat.on(phatbeat.BTN_FASTFWD)
def next(pin):
"""Next button tells MPD to play next track."""
with connection_to_mpd():
client.next()
@phatbeat.on(phatbeat.BTN_REWIND)
def previous(pin):
"""Previous button tells MPD to play previous track."""
with connection_to_mpd():
client.previous()
@phatbeat.on(phatbeat.BTN_ONOFF)
def shutdown(pin):
"""Shutdown button tells the system to shutdown now."""
command = """shutdown
-h now
"""
subprocess.run(command.split())
# maintain the module loaded for as long the the interface is needed
# without conuming resources
while True:
time.sleep(5)

1
stage2/04-pirate-radio/files/pivumeter

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Subproject commit 5e4afea8813beeec2f81d877f3ddc9a84eaa177e