Test how Liquidsoap live audio behaves using PipeWire

Pulled latest version of aura from main branch and configured according to manual. While Docker reported some issues with root privileges (even running with sudo - haven't we fixed that already?), running it locally threw some errors regarding the configuration class (which is still the old '.ini'-approach and should work, right?)

So switched directly to engire-core project and tried to run locally - which succeeded - fallback audio started playing - using "default" and as well as "pipewire".

Let's discuss any details and further steps in our upcoming meeting - I'll add some additional infos in the meantime...

It might be easier for you if you check out the alpha2 tag, not the main branch. That way we can be sure that both of us are running the same version and nothing else is interfering.

The root privileges are most likely tied to the log files. Are you sure that the aura user has read and write access to the logs directory and its sub-directories? We prevent these "root owned directories" by creating them during the Deployment Preparations steps, maybe try to run them again if you forgot them.

Log output of succeeded playout using engine-core and pipewire:

➜  engine-core git:(main) make run
(cd src && liquidsoap ./engine.liq)
        Config file: '../config/engine-core.ini'
        engine_config_folder = '../config'
        Allow Liquidsoap running as root user: false
        Liquidsoap Telnet Server at 127.0.0.1:1234 (16380.s timeout)
        Logging to '../logs/engine-core.log' with log level 3
2023/08/31 19:35:45 >>> LOG START
2023/08/31 19:35:38 [ffmpeg.filter.bitstream:3] No valid mode found for filter pgs_frame_merge!
2023/08/31 19:35:38 [main:3] Liquidsoap 2.1.4
2023/08/31 19:35:38 [main:3] Using: bytes=[distributed with OCaml 4.02 or above] pcre=7.5.0 sedlex=3.2 menhirLib=20230608 curl=0.9.2 uri=3.0.0 dtools=0.4.5 duppy=0.9.2 cry=0.6.7 mm=0.8.4 ogg=0.7.4 ogg.decoder=0.7.4 vorbis=0.8.0 vorbis.decoder=0.8.0 opus=0.2.2 opus.decoder=0.2.2 mad=0.5.2 flac=0.3.1 flac.ogg=0.3.1 flac.decoder=0.3.1 dynlink=[distributed with Ocaml] lame=0.3.7 ffmpeg=1.1.7 bjack=0.1.6 alsa=0.3.0 samplerate=0.1.6 taglib=0.3.10 camomile=1.0.2 pulseaudio=0.1.5
2023/08/31 19:35:38 [dynamic.loader:3] Could not find dynamic module for fdkaac encoder.
2023/08/31 19:35:38 [clock:3] Using builtin (low-precision) implementation for latency control
######################################################################################
2023/08/31 19:35:45 [lang:3] AURA Engine:Core v1.0.0-alpha2 starting ...
2023/08/31 19:35:45 [lang:3] ######################################################################################
2023/08/31 19:35:45 [lang:3] System Settings:
2023/08/31 19:35:45 [lang:3]    Log level 3
2023/08/31 19:35:45 [lang:3]    Config file: '../config/engine-core.ini'
2023/08/31 19:35:45 [lang:3]    Socket location: '../socket/engine.sock'
2023/08/31 19:35:45 [lang:3] 
2023/08/31 19:35:45 [lang:3] Audio Settings:
2023/08/31 19:35:45 [lang:3]    Output device: pipewire
2023/08/31 19:35:45 [lang:3] 
2023/08/31 19:35:45 [lang:3] ALSA Settings:
2023/08/31 19:35:45 [lang:3]    alsa_buffered_input = true
2023/08/31 19:35:45 [lang:3]    alsa_buffered_output = true
2023/08/31 19:35:45 [lang:3] 
2023/08/31 19:35:45 [lang:3] Stream Settings:
2023/08/31 19:35:45 [lang:3]    Input stream max buffer: 5.
2023/08/31 19:35:45 [lang:3]    Input stream timeout: 10.
2023/08/31 19:35:45 [lang:3]    Output stream enabled: false
2023/08/31 19:35:45 [lang:3] 
2023/08/31 19:35:45 [lang:3] Other Settings:
2023/08/31 19:35:45 [lang:3]    fallback_station_playlist_path = '../audio/playlists/station-fallback-playlist.m3u'
2023/08/31 19:35:45 [lang:3]    fallback_station_dir = '../audio/fallback'
2023/08/31 19:35:45 [lang:3] 
2023/08/31 19:35:45 [lang:3] ######################################################################################
2023/08/31 19:35:45 [lang:3] Fallback Type: FOLDER
2023/08/31 19:35:45 [lang:3] --- Set ALSA Output ---
2023/08/31 19:35:45 [frame:3] Using 44100Hz audio, 25Hz video, 44100Hz main.
2023/08/31 19:35:45 [frame:3] Video frame size set to: 1280x720
2023/08/31 19:35:45 [frame:3] Frame size must be a multiple of 1764 ticks = 1764 audio samples = 1 video samples.
2023/08/31 19:35:45 [frame:3] Targeting 'frame.duration': 0.04s = 1764 audio samples = 1764 ticks.
2023/08/31 19:35:45 [frame:3] Frames last 0.04s = 1764 audio samples = 1 video samples = 1764 ticks.
2023/08/31 19:35:45 [sandbox:3] Sandboxing disabled
2023/08/31 19:35:45 [video.converter:3] Using preferred video converter: ffmpeg.
2023/08/31 19:35:45 [audio.converter:3] Using samplerate converter: libsamplerate.
2023/08/31 19:35:45 [server:3] Socket created at ../socket/engine.sock.
2023/08/31 19:35:45 [video.text:3] Using native implementation
2023/08/31 19:35:45 [clock.alsa:3] Streaming loop starts in auto-sync mode
2023/08/31 19:35:45 [clock.alsa:3] Delegating synchronisation to CPU clock
2023/08/31 19:35:45 [fallback-source:3] Switch to mksafe.
2023/08/31 19:35:45 [mksafe:3] Switch to safe_blank.
2023/08/31 19:35:45 [lineout_0:3] Using ALSA 1.2.8.
2023/08/31 19:35:45 [lineout_0:3] channels=2, samplerate=44100Hz, buffer size=524288B, frame size=4B, periods=1024
2023/08/31 19:35:45 [clock.alsa:3] Delegating synchronisation to active sources
2023/08/31 19:35:45 [fallback_folder:3] Prepared "../audio/fallback/Abakus - California Sunshine.mp3" (RID 0).
2023/08/31 19:35:45 [mksafe:3] Switch to fallback_folder with transition.
2023/08/31 19:35:45 [metadata:3] Raw metadata before POST:
2023/08/31 19:35:45 [metadata:3] 
2023/08/31 19:35:45 [metadata:3]  [("compatible_brands", "iso6mp41"), ("on_air_timestamp", "1693503345.00"), ("kind", "{audio=pcm(stereo),video=none,midi=none}"), ("artist", "Abakus"), ("decoder", "FFMPEG"), ("title", "California Sunshine"), ("filename", "../audio/fallback/Abakus - California Sunshine.mp3"), ("temporary", "false"), ("source", "fallback_folder"), ("initial_uri", "../audio/fallback/Abakus - California Sunshine.mp3"), ("major_brand", "dash"), ("encoder", "Lavf54.6.100"), ("status", "playing"), ("content", "Psybient / Chillout"), ("tden", "2014-06-17 11:08:29\u0000"), ("minor_version", "0"), ("on_air", "2023/08/31 19:35:45"), ("txxx", "\u0003compatible_brands\u0000iso6mp41\u0000"), ("creation_time", "2014-06-17 11:08:29"), ("rid", "0"), ("genre", "Psybient / Chillout")]
2023/08/31 19:35:45 [metadata:3] 
2023/08/31 19:35:45 [metadata:3] 
2023/08/31 19:35:46 [metadata:3] Detected FALLBACK channel `fallback_folder` playing (Show ID: -1)
2023/08/31 19:35:46 [lang:3] Posting playlog to 'http://127.0.0.1:8008/api/v1/playlog': {
2023/08/31 19:35:46 [lang:3]   "logSource": 1,
2023/08/31 19:35:46 [lang:3]   "timeslotId": -1,
2023/08/31 19:35:46 [lang:3]   "trackDuration": 370,
2023/08/31 19:35:46 [lang:3]   "trackType": 0,
2023/08/31 19:35:46 [lang:3]   "trackStart": "2023/08/31 19:35:45",
2023/08/31 19:35:46 [lang:3]   "showId": -1,
2023/08/31 19:35:46 [lang:3]   "trackArtist": "Abakus",
2023/08/31 19:35:46 [lang:3]   "playlistId": -1,
2023/08/31 19:35:46 [lang:3]   "trackTitle": "California Sunshine",
2023/08/31 19:35:46 [lang:3]   "trackAlbum": "",
2023/08/31 19:35:46 [lang:3]   "showName": "Station Fallback"
2023/08/31 19:35:46 [lang:3] }
2023/08/31 19:35:46 [lang:3] ERROR during playlog POST: 523 | Origin is unreachable

Error after trying to run engine-core via docker:

Next step planned:

use valid audio input to test playthrough and latency
investigate mentioned errors

removed 1 deleted label

added 1 deleted label

Checked out tag alpha2 of engine-core and ran "locally" (w/o docker) first.

These audio issues (using fallback mp3) include:

right channel only
false-stereo on both channels
weird delay efx
no output

No special log except: Alsa: lineout_0:2: Underrun! (Could not fix by increasing buffer.)

Beside that, changing the mixer levels via telnet had no effect - always got 100% of first audio queue and thus no chance to play-through line-in.

So from the current perspective, pipewire doesn't seem to be the preferred solution - but keeping a misconfiguration and/or outdated hadware in mind.

@Loxbie Pls could you provide a config which worked on your end?

This sounds interesting, so even without running engine-core in docker you get audio latency issues? If that is the case we have to start investigating at the lowest level. Are you sure that no other soundserver then pipewire is running? Pulseaudio is often the culprit. Can you include your config files please? Can you also include the output of the following command where hw:CARD=Plus,DEV=0 is your soundcard.

arecord -D "hw:CARD=Plus,DEV=0" --dump-hw-params

Here is my docker compose configuration when running aura-playout:

docker-compose.yml

version: "3.4"

services:
  engine-api:
    container_name: engine-api
    image: autoradio/engine-api:${AURA_ENGINE_API_VERSION}
    user: "2872:2872"
    environment:
      TZ: ${TIMEZONE}
      AURA_ENGINE_API_LOG_LEVEL: ${AURA_ENGINE_API_LOG_LEVEL}
      AURA_ENGINE_API_HOST: 0.0.0.0
      AURA_ENGINE_API_PORT: 8008
      AURA_ENGINE_API_DB_HOST: "engine-api-postgres"
      AURA_ENGINE_API_DB_NAME: ${AURA_ENGINE_API_DB_NAME:?name of the database for engine-api}
      AURA_ENGINE_API_DB_USER: ${AURA_ENGINE_API_DB_USER:?database user for engine-api DB}
      AURA_ENGINE_API_DB_PASS: ${AURA_ENGINE_API_DB_PASS:?password for engine-api DB}
    volumes:
      - ./../services/:/etc/aura/:ro
      - ${AURA_LOGS}:/srv/logs
    depends_on:
      engine-api-postgres:
        condition: service_healthy
    ports:
      - "${AURA_ENGINE_API_BIND_URL:-127.0.0.1:8008}:8008"
    networks:
      - auranet
      - internal-engine-api
    healthcheck:
      test: [ "CMD", "nc", "-z", "-w", "3", "localhost", "8008" ]

  engine-api-postgres:
    image: postgres:${POSTGRES_VERSION:-14}
    restart: always
    environment:
      TZ: ${TIMEZONE}
      POSTGRES_DB: ${AURA_ENGINE_API_DB_NAME:?name of the database for engine-api}
      POSTGRES_USER: ${AURA_ENGINE_API_DB_USER:?database user for engine-api DB}
      POSTGRES_PASSWORD: ${AURA_ENGINE_API_DB_PASS:?password for engine-api DB}
    volumes:
      - engine_api_db_data:/var/lib/postgresql/data
    expose:
      - "5432"
    networks:
      - internal-engine-api
    healthcheck:
      test:
        [
          "CMD",
          "pg_isready",
          "-U",
          "${AURA_ENGINE_API_DB_USER:?database user for engine-api DB}",
          "-d",
          "${AURA_ENGINE_API_DB_NAME:?name of the database for engine-api}"
        ]

  engine-core:
    container_name: engine-core
    image: autoradio/engine-core:${AURA_ENGINE_CORE_VERSION}
    user: "2872:2872"
    group_add:
      - audio
    devices:
      - /dev/snd
    environment:
      TZ: ${TIMEZONE}
      AURA_ENGINE_CORE_LOG_LEVEL: ${AURA_ENGINE_CORE_LOG_LEVEL:?value from 1-5}
      AURA_ENGINE_RUN_AS_ROOT: false
      # Audio Device Settings
      AURA_ENGINE_OUTPUT_DEVICE: ${AURA_ENGINE_OUTPUT_DEVICE}
      AURA_ENGINE_INPUT_DEVICE: ${AURA_ENGINE_INPUT_DEVICE}
      # Fallback Settings
      AURA_ENGINE_FALLBACK_SHOW_NAME: ${AURA_ENGINE_FALLBACK_SHOW_NAME}
      AURA_ENGINE_FALLBACK_SHOW_ID: ${AURA_ENGINE_FALLBACK_SHOW_ID}
      AURA_ENGINE_FALLBACK_TYPE: ${AURA_ENGINE_FALLBACK_TYPE}
      AURA_ENGINE_FALLBACK_FOLDER_RELOAD: ${AURA_ENGINE_FALLBACK_FOLDER_RELOAD}
      AURA_ENGINE_FALLBACK_MAX_BLANK: ${AURA_ENGINE_FALLBACK_MAX_BLANK}
      AURA_ENGINE_FALLBACK_MIN_NOISE: ${AURA_ENGINE_FALLBACK_MIN_NOISE}
      AURA_ENGINE_FALLBACK_THRESHOLD: ${AURA_ENGINE_FALLBACK_THRESHOLD}
      # Misc Settings
      AURA_ENGINE_FRAME_SAMPLERATE: ${AURA_ENGINE_FRAME_SAMPLERATE}
      AURA_ENGINE_FRAME_DURATION: ${AURA_ENGINE_FRAME_DURATION}
      AURA_ENGINE_FRAME_SIZE: ${AURA_ENGINE_FRAME_SIZE}
      AURA_ENGINE_API_URL_PLAYLOG: ${AURA_ENGINE_API_URL_PLAYLOG}
      # Server Settings
      AURA_ENGINE_SERVER_TIMEOUT: ${AURA_ENGINE_SERVER_TIMEOUT}
      AURA_ENGINE_TELNET_ENABLE: ${AURA_ENGINE_TELNET_ENABLE}
      AURA_ENGINE_TELNET_HOST: ${AURA_ENGINE_TELNET_HOST}
      AURA_ENGINE_TELNET_PORT: ${AURA_ENGINE_TELNET_PORT}
      # Stream Input Settings
      AURA_ENGINE_STREAM_INPUT_MAX_BUFFER: ${AURA_ENGINE_STREAM_INPUT_MAX_BUFFER}
      AURA_ENGINE_STREAM_INPUT_TIMEOUT: ${AURA_ENGINE_STREAM_INPUT_TIMEOUT}
      # Stream Output Settings
      AURA_ENGINE_STREAM_OUTPUT_ENABLE: ${AURA_ENGINE_STREAM_OUTPUT_ENABLE}
      AURA_ENGINE_STREAM_OUTPUT_ENCODING: ${AURA_ENGINE_STREAM_OUTPUT_ENCODING}
      AURA_ENGINE_STREAM_OUTPUT_BITRATE: ${AURA_ENGINE_STREAM_OUTPUT_BITRATE}
      AURA_ENGINE_STREAM_OUTPUT_CHANNELS: ${AURA_ENGINE_STREAM_OUTPUT_CHANNELS}
      AURA_ENGINE_STREAM_OUTPUT_HOST: ${AURA_ENGINE_STREAM_OUTPUT_HOST}
      AURA_ENGINE_STREAM_OUTPUT_PORT: ${AURA_ENGINE_STREAM_OUTPUT_PORT}
      AURA_ENGINE_STREAM_OUTPUT_USER: ${AURA_ENGINE_STREAM_OUTPUT_USER}
      AURA_ENGINE_STREAM_OUTPUT_PASSWORD: ${AURA_ENGINE_STREAM_OUTPUT_PASSWORD}
      AURA_ENGINE_STREAM_OUTPUT_MOUNTPOINT: ${AURA_ENGINE_STREAM_OUTPUT_MOUNTPOINT}
      AURA_ENGINE_STREAM_OUTPUT_NAME: ${AURA_ENGINE_STREAM_OUTPUT_NAME}
      AURA_ENGINE_STREAM_OUTPUT_URL: ${AURA_ENGINE_STREAM_OUTPUT_URL}
      AURA_ENGINE_STREAM_OUTPUT_DESCRIPTION: ${AURA_ENGINE_STREAM_OUTPUT_DESCRIPTION}
      AURA_ENGINE_STREAM_OUTPUT_GENRE: ${AURA_ENGINE_STREAM_OUTPUT_GENRE}
    volumes:
      - ./../services/:/etc/aura/:ro
      - ./asound.conf:/etc/asound.conf
      - ${AURA_AUDIO_STORE_SOURCE}:/var/audio/source
      - ${AURA_AUDIO_STORE_PLAYLIST}:/var/audio/playlist
      - ${AURA_AUDIO_STORE_FALLBACK}:/var/audio/fallback
      - ${AURA_LOGS}:/srv/logs
      - aura_engine_socket:/srv/socket
    tmpfs:
      - /tmp
    ports:
      - 1234:1234
    networks:
      - auranet

  engine:
    container_name: engine
    image: autoradio/engine:${AURA_ENGINE_VERSION}
    user: "2872:2872"
    environment:
      TZ: ${TIMEZONE}
      AURA_ENGINE_LOG_LEVEL: ${AURA_ENGINE_LOG_LEVEL}
      # Database for caching scheduling data
      AURA_ENGINE_DB_HOST: ${AURA_ENGINE_DB_HOST}
      AURA_ENGINE_DB_NAME: ${AURA_ENGINE_DB_NAME:?name of the database for engine}
      AURA_ENGINE_DB_USER: ${AURA_ENGINE_DB_USER:?database user for engine DB}
      AURA_ENGINE_DB_PASS: ${AURA_ENGINE_DB_PASS:?password for engine DB}
      # API
      AURA_ENGINE_API_BASE_URL: ${AURA_ENGINE_API_BASE_URL}
      AURA_STEERING_BASE_URL: ${AURA_STEERING_BASE_URL}
      AURA_TANK_BASE_URL: ${AURA_TANK_BASE_URL}
      AURA_TANK_ENGINE_USER: engine
      AURA_TANK_ENGINE_PASSWORD: ${AURA_TANK_ENGINE_PASSWORD:?secret of engine to connect to tank}
      # Details for the Station Fallback i.e. the default show when nothing is scheduled
      AURA_ENGINE_FALLBACK_SHOW_NAME: ${AURA_ENGINE_FALLBACK_SHOW_NAME}
      AURA_ENGINE_FALLBACK_SHOW_ID: ${AURA_ENGINE_FALLBACK_SHOW_ID}
      # Offset in seconds how long it takes for Liquidsoap to actually execute a scheduler command; Crucial to keep things in sync
      AURA_ENGINE_LATENCY_OFFSET: ${AURA_ENGINE_LATENCY_OFFSET}
      # Fade duration when selecting another mixer input (seconds)
      AURA_ENGINE_FADE_IN_TIME: ${AURA_ENGINE_FADE_IN_TIME}
      AURA_ENGINE_FADE_OUT_TIME: ${AURA_ENGINE_FADE_OUT_TIME}
      # Host and UDP port where heartbeat is sent to (disabled if empty string)
      # Seconds how often the vitality of Engine Core should be checked (default=1)
      AURA_ENGINE_HEARTBEAT_SERVER: ${AURA_ENGINE_HEARTBEAT_SERVER}
      AURA_ENGINE_HEARTBEAT_SERVER_PORT: ${AURA_ENGINE_HEARTBEAT_SERVER_PORT}
      AURA_ENGINE_HEARTBEAT_FREQUENCY: ${AURA_ENGINE_HEARTBEAT_FREQUENCY}
    volumes:
      - ./../services/:/etc/aura/:ro
      - ${AURA_AUDIO_STORE_SOURCE}:/var/audio/source:ro
      - ${AURA_AUDIO_STORE_PLAYLIST}:/var/audio/playlist
      - ${AURA_LOGS}:/srv/logs
      - aura_engine_socket:/srv/socket
    depends_on:
      - engine-postgres
      - engine-api
      - engine-core
    networks:
      - auranet
      - internal-engine

  engine-postgres:
    image: postgres:${POSTGRES_VERSION:-14}
    restart: always
    environment:
      TZ: ${TIMEZONE}
      POSTGRES_PASSWORD: ${AURA_ENGINE_DB_PASS:?password for engine DB}
      POSTGRES_USER: ${AURA_ENGINE_DB_USER:?database user for engine DB}
      POSTGRES_DB: ${AURA_ENGINE_DB_NAME:?name of the database for engine}
    volumes:
      - engine_db_data:/var/lib/postgresql/data
    networks:
      - internal-engine

  engine-recorder:
    container_name: engine-recorder
    image: autoradio/engine-recorder:${AURA_ENGINE_RECORDER_VERSION:-unstable}
    environment:
      AUDIO_DEVICE: ${AURA_ENGINE_RECORDER_AUDIO_DEVICE:-pcm.aura_recorder}
      SAMPLE_FORMAT: ${AURA_ENGINE_RECORDER_SAMPLE_FORMAT}
      SAMPLE_RATE: ${AURA_ENGINE_RECORDER_SAMPLE_RATE}
      SEGMENT_LENGTH: ${AURA_ENGINE_RECORDER_SEGMENT_LENGTH:-1800}
      SEGMENT_STRING_FORMAT: ${AURA_ENGINE_RECORDER_SEGMENT_STRING_FORMAT:-%Y-%m-%d_%H:%M:%S}
      SYNC: ${AURA_ENGINE_RECORDER_SYNC:-False}
      SYNC_DESTINATION: ${AURA_ENGINE_RECORDER_SYNC_DESTINATION:-/tmp}
      SYNC_OPTIONS: ${AURA_ENGINE_RECORDER_SYNC_OPTIONS:--a}
      DELETE: ${AURA_ENGINE_RECORDER_DELETE:-False}
      DELETE_OLDER_THAN: ${AURA_ENGINE_RECORDER_DELETE_OLDER_THAN:-7}
      LOG_LEVEL: ${AURA_ENGINE_RECORDER_LOG_LEVEL:-INFO}

    volumes:
      - ./../services/:/etc/aura/:ro
      - ./asound.conf:/etc/asound.conf
      - ${AURA_AUDIO_STORE_RECORDINGS}:/var/audio
      - ${AURA_LOGS}:/srv/log
    group_add:
      - audio
    devices:
      - /dev/snd:/dev/snd
    profiles:
      - engine-recorder-enabled

networks:
  auranet:
    name: auranet
  internal-engine:
  internal-engine-api:


volumes:
  aura_engine_socket:
  engine_db_data:
  engine_api_db_data:

asound.conf

pcm.aura_engine {
  type plug
  slave { pcm "hw:CARD=AG06MK2,DEV=0" }
}
pcm.aura_recorder {
  type plug
  slave { pcm "pcm.aura_engine" }
}

.env


# Released versions of the Docker images
AURA_ENGINE_VERSION=1.0.0-alpha2
AURA_ENGINE_API_VERSION=1.0.0-alpha2
AURA_ENGINE_CORE_VERSION=1.0.0-alpha2
AURA_ENGINE_RECORDER_VERSION=1.0.0-alpha2
# Version of postgres. Defaults to 14
# POSTGRES_VERSION=14


### GENERAL

# Timezone
TIMEZONE=Europe/Vienna
# Folder to store service log files
AURA_LOGS=../../logs


### AUDIO STORE

# Folder holding audio sources provided by Tank (absolute path)
AURA_AUDIO_STORE_SOURCE=../../audio/source
# Folder holding M3U Playlists
AURA_AUDIO_STORE_PLAYLIST=../../audio/playlist
# Folder holding audio for fallback scenarios
AURA_AUDIO_STORE_FALLBACK=../../audio/fallback
# Folder holding recordings
AURA_AUDIO_STORE_RECORDINGS=../../audio/recordings


### ENGINE

# Possible values: debug, info, warning, error, critical
AURA_ENGINE_LOG_LEVEL=info
# Database for caching scheduling data
AURA_ENGINE_DB_HOST=engine-postgres
AURA_ENGINE_DB_NAME=aura_engine
AURA_ENGINE_DB_USER=aura_engine
AURA_ENGINE_DB_PASS=Some_Password
# API
AURA_ENGINE_API_BASE_URL=http://engine-api:8008/
AURA_STEERING_BASE_URL=http://steering:8000/
AURA_TANK_BASE_URL=http://tank:8040/
AURA_TANK_ENGINE_PASSWORD=Some_Password
# Offset in seconds how long it takes for Liquidsoap to actually execute a scheduler command; Crucial to keep things in sync
AURA_ENGINE_LATENCY_OFFSET=0.5
# Fade duration when selecting another mixer input (seconds)
AURA_ENGINE_FADE_IN_TIME=0.1
AURA_ENGINE_FADE_OUT_TIME=0.1
# Host and UDP port where heartbeat is sent to (disabled if empty string)
# Seconds how often the vitality of Engine Core should be checked (default=1)
AURA_ENGINE_HEARTBEAT_SERVER=
AURA_ENGINE_HEARTBEAT_SERVER_PORT=43334
AURA_ENGINE_HEARTBEAT_FREQUENCY=1


### ENGINE API

# Possible values: debug, info, warning, error, critical
AURA_ENGINE_API_LOG_LEVEL=info
# Configure the database for engine-api
AURA_ENGINE_API_DB_NAME=aura_engine_api
AURA_ENGINE_API_DB_USER=aura_engine_api
AURA_ENGINE_API_DB_PASS=Some_Password
# Set the URL engine-api should bind to. Note that setting this to 0.0.0.0:8008 would make engine-api globally accessible. You probably want to set this to a private network.
# AURA_ENGINE_API_BIND_URL=127.0.0.1:8008


### ENGINE CORE

# Audio Device Settings
AURA_ENGINE_OUTPUT_DEVICE=pcm.aura_engine
AURA_ENGINE_INPUT_DEVICE=pcm.aura_engine
# Fallback Settings
AURA_ENGINE_FALLBACK_SHOW_NAME=Station Fallback
AURA_ENGINE_FALLBACK_SHOW_ID=-1
AURA_ENGINE_FALLBACK_TYPE=folder
AURA_ENGINE_FALLBACK_FOLDER_RELOAD=300
AURA_ENGINE_FALLBACK_MAX_BLANK=15.
AURA_ENGINE_FALLBACK_MIN_NOISE=0.
AURA_ENGINE_FALLBACK_THRESHOLD=-80.
# Misc Settings
AURA_ENGINE_CORE_LOG_LEVEL=3
AURA_ENGINE_FRAME_SAMPLERATE=
AURA_ENGINE_FRAME_DURATION=
AURA_ENGINE_FRAME_SIZE=64
AURA_ENGINE_API_URL_PLAYLOG=http://engine-api:8008/api/v1/playlog
# Server Settings
AURA_ENGINE_SERVER_TIMEOUT=16380
AURA_ENGINE_TELNET_ENABLE=true
AURA_ENGINE_TELNET_HOST=0.0.0.0
AURA_ENGINE_TELNET_PORT=1234
# Stream Input Settings
AURA_ENGINE_STREAM_INPUT_MAX_BUFFER=5.0
AURA_ENGINE_STREAM_INPUT_TIMEOUT=10.0
# Stream Output Settings
AURA_ENGINE_STREAM_OUTPUT_ENABLE=false
AURA_ENGINE_STREAM_OUTPUT_ENCODING=ogg
AURA_ENGINE_STREAM_OUTPUT_BITRATE=128
AURA_ENGINE_STREAM_OUTPUT_CHANNELS=2
AURA_ENGINE_STREAM_OUTPUT_HOST=localhost
AURA_ENGINE_STREAM_OUTPUT_PORT=8888
AURA_ENGINE_STREAM_OUTPUT_USER=source
AURA_ENGINE_STREAM_OUTPUT_PASSWORD=source
AURA_ENGINE_STREAM_OUTPUT_MOUNTPOINT=aura-radio.ogg
AURA_ENGINE_STREAM_OUTPUT_NAME=AURA.radio
AURA_ENGINE_STREAM_OUTPUT_URL=https://aura.radio
AURA_ENGINE_STREAM_OUTPUT_DESCRIPTION=Music from the community radio software suite
AURA_ENGINE_STREAM_OUTPUT_GENRE=music


### ENGINE RECORDER

# Set an ALSA audio device or HTTP audio stream
AURA_ENGINE_RECORDER_AUDIO_DEVICE=pcm.aura_recorder
# audio codec format, for example "pcm_s32le"
AURA_ENGINE_RECORDER_SAMPLE_FORMAT=
# sampling rate, for example 44100
AURA_ENGINE_RECORDER_SAMPLE_RATE=
# time length of one recording block in seconds, for example 1800
AURA_ENGINE_RECORDER_SEGMENT_LENGTH=1800
# name of the segment, for example "%Y-%m-%d_%H:%M:%S_%s"
AURA_ENGINE_RECORDER_SEGMENT_STRING_FORMAT=%Y-%m-%d_%H:%M:%S
# set to true if you want to sync the content of AURA_AUDIO_STORE/recordings/block to somewhere else
AURA_ENGINE_RECORDER_SYNC=False
# the destination where we sync to, this can be a remote location. If you chose a remote location
# make sure that you supply a sshkey, otherwise the script will ask you for your password every
# day
# for example user@remote_server:/tmp/audio
# AURA_ENGINE_RECORDER_SYNC_DESTINATION=/tmp
# the options with which we start rsync. They are not allowed to have spaces in between them
# for example "-a" or "-apogt"
# AURA_ENGINE_RECORDER_SYNC_OPTIONS=-a
# set to True if you want to delete audio files older than X days
AURA_ENGINE_RECORDER_DELETE=False
# AURA_ENGINE_RECORDER_DELETE_OLDER_THAN=7

AURA_ENGINE_RECORDER_LOG_LEVEL=INFO


### DEVELOPMENT ###

# If you want to use a dev-setup, which exposes some more ports
# and builds the containers locally, uncomment the following
# line
# COMPOSE_FILE=docker-compose.yml:docker-compose.dev.yml

I can confirm that the playout only plays on the right channel. I have no clue why this is the case, maybe @david can shine some light on this.

Yes, had these issues without docker and pulseaudio disabled.

Running using docker failed anyhow (while building the docker image succeeded):

➜  engine-core git:(1.0.0-alpha2) make docker.run
/usr/bin/docker
docker: unknown server OS: .
See 'docker run --help'.
make: *** [build/docker.Makefile:35: docker.run] Error 125

...but fully agree to start investigating at the lowest level - so tried again to start a stable playback without docker...

Could fix the stereo issue by moving the balance-slider in the audio settings, but the buffering issue (short breaks / clicks) still persists.

Got the following output by running arecord -D "hw:CARD=2,DEV=0" --dump-hw-params:

Warning: Some sources (like microphones) may produce inaudible results
         with 8-bit sampling. Use '-f' argument to increase resolution
         e.g. '-f S16_LE'.
Recording WAVE 'stdin' : Unsigned 8 bit, Rate 8000 Hz, Mono
HW Params of device "hw:CARD=2,DEV=0":
--------------------
ACCESS:  MMAP_INTERLEAVED RW_INTERLEAVED
FORMAT:  S32_LE
SUBFORMAT:  STD
SAMPLE_BITS: 32
FRAME_BITS: 64
CHANNELS: 2
RATE: [44100 192000]
PERIOD_TIME: [125 1000000]
PERIOD_SIZE: [8 192000]
PERIOD_BYTES: [64 1536000]
PERIODS: [2 1024]
BUFFER_TIME: (83 2000000]
BUFFER_SIZE: [16 384000]
BUFFER_BYTES: [128 3072000]
TICK_TIME: ALL
--------------------
arecord: set_params:1352: Sample format non available
Available formats:
- S32_LE

Configs used:

engine-core.ini asoundrc

Seems to run stable now using docker too - thanks @Loxbie!

Just preparing a setup for testing the signal against discontinuities and latency #55 (closed), so closing this ticket soon.

Encountered no severe problems while listening to the music coming from my personal audio interface - routed through the aura-testing-setup - while running engine-core in a docker container and enabling line-in.

Also noticed fallback audio after muting input signal

So closing this ticket - let's discuss further issues in #55 (closed).

closed

removed Doing label

marked the checklist item Reproduce the successful test scenario with Pipewire above as completed

I am reopening this since we neglected some of the tasks mentioned above. We still need to

Decide in the team if we should support ALSA with PipeWire only
Add the instructions to the Engine Core README
Add the instructions to the "Aura Playout" docs at docs.aura.radio

As I mentioned here in #50 (closed), I am in favor of support PipeWire only (but with JACK, not ALSA). I created a feature branch where I started to include the instructions to the Engine Core README. @chrizz are you okay with me reassigning the ticket to myself?

No matter what we choose, ALSA or JACK, the PipeWire instructions can be reused.

IMHO we can set PipeWire + ALSA as a default requirement, since PipeWire is the default sound server in Debian 12 / Gnome.

We only need to add the requirement, that we officially only support Debian 12+. As a consequence the install instructions can also be much shorter and more clean.

Regarding JACK vs. ALSA I cannot comment, because I need more insights first. I was unter the impression, that PipeWire already supports multi-channel handling natively.

reopened

added To Do label

Sure, just reassign it to you.

I don't prefer any of these methods yet but I'm happy that my setup works using ALSA - at least for now.

@Loxbie How can I switch my current ALSA-only-setup to use JACK? I noticed the change in the docker file but are there any additional configurations neccessary which I'm not aware of?

We could discuss it next Thu before/after our retro meeting or in the upcoming days afternoon if you prefer.

There is some stuff happening when building the container, manly swapping the base container image from liquidsoap to debian (for better PipeWire support), installing pipewire and pipewire-jack.

But this all happens in the container. On your host system you would have to install PipeWire as the sound server and optionally a ui like qpwgraph to connect your in- and outputs. I am still working on the complete documentation but I can walk you through it if you want to test it right away.

Thursday before the retro sounds great, lets fix the details in the matrix chat.

A first version of the updated README is now available on the feat-jack-support branch.

assigned to @Loxbie and unassigned @chrizz

removed To Do label

added Doing label

marked the checklist item Add the instructions to the Engine Core README as completed

added 1 deleted label

marked this issue as related to #62 (closed)

mentioned in issue aura#285 (closed)

closed

removed Doing label

Test how Liquidsoap live audio behaves using PipeWire

Parent: [EPIC] Smooth play-out latency and buffering fo... (#50 - closed)

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