ALSA config file, aplay/amixer outputs and forked-daapd.conf

pi@raspberrypi:~ $ cat ~/.asoundrc
ctl.!default {
	type hw
	card 0
}

pcm.!default {
    type plug
    slave.pcm "dmixer"
}

pcm.dmixer  {
    type dmix
    ipc_key 1024
    ipc_key_add_uid false
    ipc_perm 0666

    slave {
	pcm "hw:0,0"
	period_time 0
	period_size 4096
	buffer_size 22052
	rate 44100
    }
}

ctl.dmixer {
    type hw
    card 0                  # underlying device
    device 0
}
pi@raspberrypi:~ $ aplay -l
**** List of PLAYBACK Hardware Devices ****
card 0: Audio [NAD USB Audio], device 0: USB Audio [USB Audio]
  Subdevices: 1/1
  Subdevice #0: subdevice #0
card 1: ALSA [bcm2835 ALSA], device 0: bcm2835 ALSA [bcm2835 ALSA]
  Subdevices: 7/7
  Subdevice #0: subdevice #0
  Subdevice #1: subdevice #1
  Subdevice #2: subdevice #2
  Subdevice #3: subdevice #3
  Subdevice #4: subdevice #4
  Subdevice #5: subdevice #5
  Subdevice #6: subdevice #6
card 1: ALSA [bcm2835 ALSA], device 1: bcm2835 IEC958/HDMI [bcm2835 IEC958/HDMI]
  Subdevices: 1/1
  Subdevice #0: subdevice #0
card 1: ALSA [bcm2835 ALSA], device 2: bcm2835 IEC958/HDMI1 [bcm2835 IEC958/HDMI1]
  Subdevices: 1/1
  Subdevice #0: subdevice #0
pi@raspberrypi:~ $ aplay -L
null
    Discard all samples (playback) or generate zero samples (capture)
default
dmixer
sysdefault:CARD=Audio
    NAD USB Audio, USB Audio
    Default Audio Device
front:CARD=Audio,DEV=0
    NAD USB Audio, USB Audio
    Front speakers
surround21:CARD=Audio,DEV=0
    NAD USB Audio, USB Audio
    2.1 Surround output to Front and Subwoofer speakers
surround40:CARD=Audio,DEV=0
    NAD USB Audio, USB Audio
    4.0 Surround output to Front and Rear speakers
surround41:CARD=Audio,DEV=0
    NAD USB Audio, USB Audio
    4.1 Surround output to Front, Rear and Subwoofer speakers
surround50:CARD=Audio,DEV=0
    NAD USB Audio, USB Audio
    5.0 Surround output to Front, Center and Rear speakers
surround51:CARD=Audio,DEV=0
    NAD USB Audio, USB Audio
    5.1 Surround output to Front, Center, Rear and Subwoofer speakers
surround71:CARD=Audio,DEV=0
    NAD USB Audio, USB Audio
    7.1 Surround output to Front, Center, Side, Rear and Woofer speakers
iec958:CARD=Audio,DEV=0
    NAD USB Audio, USB Audio
    IEC958 (S/PDIF) Digital Audio Output
dmix:CARD=Audio,DEV=0
    NAD USB Audio, USB Audio
    Direct sample mixing device
dsnoop:CARD=Audio,DEV=0
    NAD USB Audio, USB Audio
    Direct sample snooping device
hw:CARD=Audio,DEV=0
    NAD USB Audio, USB Audio
    Direct hardware device without any conversions
plughw:CARD=Audio,DEV=0
    NAD USB Audio, USB Audio
    Hardware device with all software conversions
sysdefault:CARD=ALSA
    bcm2835 ALSA, bcm2835 ALSA
    Default Audio Device
dmix:CARD=ALSA,DEV=0
    bcm2835 ALSA, bcm2835 ALSA
    Direct sample mixing device
dmix:CARD=ALSA,DEV=1
    bcm2835 ALSA, bcm2835 IEC958/HDMI
    Direct sample mixing device
dmix:CARD=ALSA,DEV=2
    bcm2835 ALSA, bcm2835 IEC958/HDMI1
    Direct sample mixing device
dsnoop:CARD=ALSA,DEV=0
    bcm2835 ALSA, bcm2835 ALSA
    Direct sample snooping device
dsnoop:CARD=ALSA,DEV=1
    bcm2835 ALSA, bcm2835 IEC958/HDMI
    Direct sample snooping device
dsnoop:CARD=ALSA,DEV=2
    bcm2835 ALSA, bcm2835 IEC958/HDMI1
    Direct sample snooping device
hw:CARD=ALSA,DEV=0
    bcm2835 ALSA, bcm2835 ALSA
    Direct hardware device without any conversions
hw:CARD=ALSA,DEV=1
    bcm2835 ALSA, bcm2835 IEC958/HDMI
    Direct hardware device without any conversions
hw:CARD=ALSA,DEV=2
    bcm2835 ALSA, bcm2835 IEC958/HDMI1
    Direct hardware device without any conversions
plughw:CARD=ALSA,DEV=0
    bcm2835 ALSA, bcm2835 ALSA
    Hardware device with all software conversions
plughw:CARD=ALSA,DEV=1
    bcm2835 ALSA, bcm2835 IEC958/HDMI
    Hardware device with all software conversions
plughw:CARD=ALSA,DEV=2
    bcm2835 ALSA, bcm2835 IEC958/HDMI1
    Hardware device with all software conversions
pi@raspberrypi:~ $ amixer -c 0
Simple mixer control 'Master',0
  Capabilities: volume
  Playback channels: Front Left - Front Right
  Capture channels: Front Left - Front Right
  Limits: 0 - 255
  Front Left: 127 [50%]
  Front Right: 127 [50%]
Simple mixer control 'PCM',0
  Capabilities: volume
  Playback channels: Front Left - Front Right
  Capture channels: Front Left - Front Right
  Limits: 0 - 255
  Front Left: 225 [88%]
  Front Right: 225 [88%]

 pi@raspberrypi:~ $ cat /etc/forked-daapd.conf
# A quick guide to configuring forked-daapd:
#
# For regular use, the most important setting to configure is "directories",
# which should be the location of your media. Whatever user you have set as
# "uid" must have read access to this location. If the location is a network
# mount, please see the README.
#
# In all likelihood, that's all you need to do!

general {
	# Username
	# Make sure the user has read access to the library directories you set
	# below, and full access to the databases, log and local audio
	uid = "root"

	# Database location
#	db_path = "/var/cache/forked-daapd/songs3.db"

	# Log file and level
	# Available levels: fatal, log, warning, info, debug, spam
	logfile = "/var/log/forked-daapd.log"
	loglevel = log

	# Admin password for the web interface
	# Note that access to the web interface from computers in
	# "trusted_network" (see below) does not require password
#	admin_password = ""

	# Websocket port for the web interface.
#	websocket_port = 3688

	# Sets who is allowed to connect without authorisation. This applies to
	# client types like Remotes, DAAP clients (iTunes) and to the web
	# interface. Options are "any", "localhost" or the prefix to one or
	# more ipv4/6 networks. The default is { "localhost", "192.168", "fd" }
#	trusted_networks = { "localhost", "192.168", "fd" }

	# Enable/disable IPv6
	ipv6 = yes

	# Location of cache database
#	cache_path = "/var/cache/forked-daapd/cache.db"

	# DAAP requests that take longer than this threshold (in msec) get their
	# replies cached for next time. Set to 0 to disable caching.
#	cache_daap_threshold = 1000

	# When starting playback, autoselect speaker (if none of the previously
	# selected speakers/outputs are available)
#	speaker_autoselect = yes

	# Most modern systems have a high-resolution clock, but if you are on an
	# unusual platform and experience audio drop-outs, you can try changing
	# this option
#	high_resolution_clock = yes
}

# Library configuration
library {
	# Name of the library as displayed by the clients (%h: hostname). If you
	# change the name after pairing with Remote you may have to re-pair.
	name = "My Music on %h"

	# TCP port to listen on. Default port is 3689 (daap)
	port = 3689

	# Password for the library. Optional.
#	password = ""

	# Directories to index
	directories = { "/media/Music" }

	# Follow symlinks. Default: true.
#	follow_symlinks = true

	# Directories containing podcasts
	# For each directory that is indexed the path is matched against these
	# names. If there is a match all items in the directory are marked as
	# podcasts. Eg. if you index /srv/music, and your podcasts are in
	# /srv/music/Podcasts, you can set this to "/Podcasts".
	# (changing this setting only takes effect after rescan, see the README)
	podcasts = { "/Podcasts" }

	# Directories containing audiobooks
	# For each directory that is indexed the path is matched against these
	# names. If there is a match all items in the directory are marked as
	# audiobooks.
	# (changing this setting only takes effect after rescan, see the README)
	audiobooks = { "/Audiobooks" }

	# Directories containing compilations (eg soundtracks)
	# For each directory that is indexed the path is matched against these
	# names. If there is a match all items in the directory are marked as
	# compilations.
	# (changing this setting only takes effect after rescan, see the README)
	compilations = { "/Compilations" }

	# Compilations usually have many artists, and sometimes no album artist.
	# If you don't want every artist to be listed in artist views, you can
	# set a single name which will be used for all compilation tracks
	# without an album artist, and for all tracks in the compilation
	# directories.
	# (changing this setting only takes effect after rescan, see the README)
	compilation_artist = "Various Artists"

	# If your album and artist lists are cluttered, you can choose to hide
	# albums and artists with only one track. The tracks will still be
	# visible in other lists, e.g. songs and playlists. This setting
	# currently only works in some remotes.
#	hide_singles = false

	# Internet streams in your playlists will by default be shown in the
	# "Radio" library, like iTunes does. However, some clients (like
	# TunesRemote+) won't show the "Radio" library. If you would also like
	# to have them shown like normal playlists, you can enable this option.
#	radio_playlists = false

	# These are the default playlists. If you want them to have other names,
	# you can set it here.
#	name_library    = "Library"
#	name_music      = "Music"
#	name_movies     = "Movies"
#	name_tvshows    = "TV Shows"
#	name_podcasts   = "Podcasts"
#	name_audiobooks = "Audiobooks"
#	name_radio      = "Radio"

	# Artwork file names (without file type extension)
	# forked-daapd will look for jpg and png files with these base names
#	artwork_basenames = { "artwork", "cover", "Folder", "folder" }

	# Enable searching for artwork corresponding to each individual media
	# file instead of only looking for album artwork. This is disabled by
	# default to reduce cache size.
#	artwork_individual = false

	# File types the scanner should ignore
	# Non-audio files will never be added to the database, but here you
	# can prevent the scanner from even probing them. This might improve
	# scan time. By default .db, .ini, .db-journal, .pdf and .metadata are
	# ignored.
#	filetypes_ignore = { ".db", ".ini", ".db-journal", ".pdf", ".metadata" }

	# File paths the scanner should ignore
	# If you want to exclude files on a more advanced basis you can enter
	# one or more POSIX regular expressions, and any file with a matching
	# path will be ignored.
#	filepath_ignore = { "myregex" }

	# Disable startup file scanning
	# When forked-daapd starts it will do an initial file scan of your
	# library (and then watch it for changes). If you are sure your library
	# never changes while forked-daapd is not running, you can disable the
	# initial file scan and save some system ressources. Disabling this scan
	# may lead to forked-daapd's database coming out of sync with the
	# library. If that happens read the instructions in the README on how
	# to trigger a rescan.
	filescan_disable = true

	# Should metadata from m3u playlists, e.g. artist and title in EXTINF,
	# override the metadata we get from radio streams?
#	m3u_overrides = false

	# Should iTunes metadata override ours?
#	itunes_overrides = false

	# Should we import the content of iTunes smart playlists?
#	itunes_smartpl = false

	# Decoding options for DAAP clients
	# Since iTunes has native support for mpeg, mp4a, mp4v, alac and wav,
	# such files will be sent as they are. Any other formats will be decoded
	# to raw wav. If forked-daapd detects a non-iTunes DAAP client, it is
	# assumed to only support mpeg and wav, other formats will be decoded.
	# Here you can change when to decode. Note that these settings have no
	# effect on AirPlay.
	# Formats: mp4a, mp4v, mpeg, alac, flac, mpc, ogg, wma, wmal, wmav, aif, wav
	# Formats that should never be decoded
#	no_decode = { "format", "format" }
	# Formats that should always be decoded
#	force_decode = { "format", "format" }

	# Watch named pipes in the library for data and autostart playback when
	# there is data to be read. To exclude specific pipes from watching,
	# consider using the above _ignore options.
#	pipe_autostart = true

	# Enable automatic rating updates
	# If enabled, rating is automatically updated after a song has either been
	# played or skipped (only skipping to the next song is taken into account).
	# The calculation is taken from the beets plugin "mpdstats" (see
	# https://beets.readthedocs.io/en/latest/plugins/mpdstats.html).
	# It consist of calculating a stable rating based only on the play- and
	# skipcount and a rolling rating based on the current rating and the action
	# (played or skipped). Both results are combined with a mix-factor of 0.75:
	# new rating = 0.75 * stable rating + 0.25 * rolling rating)
#	rating_updates = false

	# Allows creating, deleting and modifying m3u playlists in the library directories.
	# Only supported by the player web interface and some mpd clients
	# Defaults to being disabled.
#	allow_modifying_stored_playlists = false

	# A directory in one of the library directories that will be used as the default
	# playlist directory. forked-dapd creates new playlists in this directory if only
	# a playlist name is provided (requires "allow_modify_stored_playlists" set to true).
#	default_playlist_directory = ""
}

# Local audio output
audio {
	# Name - used in the speaker list in Remote
	nickname = "Computer"

	# Type of the output (alsa, pulseaudio, dummy or disabled)
	type = "alsa"

	# For pulseaudio output, an optional server hostname or IP can be
	# specified (e.g. "localhost"). If not set, connection is made via local
	# socket.
#	server = ""

	# Audio PCM device name for local audio output - ALSA only
	card = "default"

	# Mixer channel to use for volume control - ALSA only
	# If not set, PCM will be used if available, otherwise Master.
	mixer = "Master"

	# Mixer device to use for volume control - ALSA only
	# If not set, the value for "card" will be used.
	mixer_device = "hw:0"

	# Enable or disable audio resampling to keep local audio in sync with
	# e.g. Airplay. This feature relies on accurate ALSA measurements of
	# delay, and some devices don't provide that. If that is the case you
	# are better off disabling the feature.
#	sync_disable = false

	# Here you can adjust when local audio is started relative to other
	# speakers, e.g. Airplay. Negative values correspond to moving local
	# audio ahead, positive correspond to delaying it. The unit is
	# milliseconds. The offset must be between -1000 and 1000 (+/- 1 sec).
#	offset_ms = 0

	# To calculate what and if resampling is required, local audio delay is
	# measured each second. After a period the collected measurements are
	# used to estimate drift and latency, which determines if corrections
	# are required. This setting sets the length of that period in seconds.
#	adjust_period_seconds = 100
}

# ALSA device settings
# If you have multiple ALSA devices you can configure them individually via
# sections like the below. Make sure to set the "card name" correctly. See the
# README about ALSA for details. Note that these settings will override the ALSA
# settings in the "audio" section above.
#alsa "card name" {
	# Name - used in the speaker list in Remote
	# If not set, the card name will be used
#	nickname = "Computer"

	# Mixer channel to use for volume control
	# If not set, PCM will be used if available, otherwise Master
#	mixer = ""

	# Mixer device to use for volume control
	# If not set, the card name will be used
#	mixer_device = ""
#}

# Pipe output
# Allows forked-daapd to output audio data to a named pipe
#fifo {
#	nickname = "fifo"
#	path = "/path/to/fifo"
#}

# AirPlay/Airport Express device settings
# (make sure you get the capitalization of the device name right)
#airplay "My AirPlay device" {
	# forked-daapd's volume goes to 11! If that's more than you can handle
	# you can set a lower value here
#	max_volume = 11

	# Enable this option to exclude a particular AirPlay device from the
	# speaker list
#	exclude = false

	# Enable this option to keep a particular AirPlay device in the speaker
	# list and thus ignore mdns notifications about it no longer being
	# present. The speaker will remain until restart of forked-daapd.
#	permanent = false

	# AirPlay password
#	password = "s1kr3t"
#}

# Chromecast settings
# (make sure you get the capitalization of the device name right)
#chromecast "My Chromecast device" {
	# Enable this option to exclude a particular device from the speaker
	# list
#	exclude = false
#}

# Spotify settings (only have effect if Spotify enabled - see README/INSTALL)
spotify {
	# Directory where user settings should be stored (credentials)
#	settings_dir = "/var/cache/forked-daapd/libspotify"

	# Cache directory
#	cache_dir = "/tmp"

	# Set preferred bitrate for music streaming
	# 0: No preference (default), 1: 96kbps, 2: 160kbps, 3: 320kbps
#	bitrate = 0

	# Your Spotify playlists will by default be put in a "Spotify" playlist
	# folder. If you would rather have them together with your other
	# playlists you can set this option to true.
#	base_playlist_disable = false

	# Spotify playlists usually have many artist, and if you don't want
	# every artist to be listed when artist browsing in Remote, you can set
	# the artist_override flag to true. This will use the compilation_artist
	# as album artist for Spotify items.
#	artist_override = false

	# Similar to the different artists in Spotify playlists, the playlist
	# items belong to different albums, and if you do not want every album
	# to be listed when browsing in Remote, you can set the album_override
	# flag to true. This will use the playlist name as album name for
	# Spotify items. Notice that if an item is in more than one playlist,
	# it will only appear in one album when browsing (in which album is
	# random).
#	album_override = false
}

# MPD configuration (only have effect if MPD enabled - see README/INSTALL)
mpd {
	# TCP port to listen on for MPD client requests.
	# Default port is 6600, set to 0 to disable MPD support.
#	port = 6600

	# HTTP port to listen for artwork requests (only supported by some MPD
	# clients and will need additional configuration in the MPD client to
	# work). Set to 0 to disable serving artwork over http.
#	http_port = 0

	# By default forked-daapd will - like iTunes - clear the playqueue if
	# playback stops. Setting clear_queue_on_stop_disable to true will keep
	# the playlist like MPD does. Note that some dacp clients do not show
	# the playqueue if playback is stopped.
#	clear_queue_on_stop_disable = false
}

# SQLite configuration (allows to modify the operation of the SQLite databases)
# Make sure to read the SQLite documentation for the corresponding PRAGMA
# statements as changing them from the defaults may increase the possibility of
# database corruptions! By default the SQLite default values are used.
sqlite {
	# Cache size in number of db pages for the library database
	# (SQLite default page size is 1024 bytes and cache size is 2000 pages)
#	pragma_cache_size_library = 2000

	# Cache size in number of db pages for the daap cache database
	# (SQLite default page size is 1024 bytes and cache size is 2000 pages)
#	pragma_cache_size_cache = 2000

	# Sets the journal mode for the database
	# DELETE (default), TRUNCATE, PERSIST, MEMORY, WAL, OFF
#	pragma_journal_mode = DELETE

	# Change the setting of the "synchronous" flag
	# 0: OFF, 1: NORMAL, 2: FULL (default)
#	pragma_synchronous = 2

	# Number of bytes set aside for memory-mapped I/O  for the library database
	# (requires sqlite 3.7.17 or later)
	# 0: disables mmap (default), any other value > 0: number of bytes for mmap
#	pragma_mmap_size_library = 0

	# Number of bytes set aside for memory-mapped I/O for the cache database
	# (requires sqlite 3.7.17 or later)
	# 0: disables mmap (default), any other value > 0: number of bytes for mmap
#	pragma_mmap_size_cache = 0

	# Should the database be vacuumed on startup? (increases startup time,
	# but may reduce database size). Default is yes.
#	vacuum = yes
}

# Streaming audio settings for remote connections (ie stream.mp3)
streaming {
	# Sample rate, typically 44100 or 48000
#	sample_rate = 44100

	# Set the MP3 streaming bit rate (in kbps), valid options: 64 / 96 / 128 / 192 / 320
#	bit_rate = 192
}