AV (Audio/Video)

System audiowizualny, spięty z spejsiot.

Current status: Działa, trochę. https://pad.inf.re/p/hswaw-media

tl;dr działa, use http://iot.waw.hackerspace.pl/, kabel HDMI / mediabox powinien gdzieś wisieć przy lewym słupie. Docelowo na mediaboxie będzie przycisk do odpalania projektora / opuszczania ekranu.

There is sound assistant under https://sound.waw.hackerspace.pl/ It can play music from Spotify, you can run it on hackerspace speakers or into your browser
Gniazdo analogowego audio dostępne jest na mediaboxie. Domyślnie pod kabel mini-jack podpięty jest odbiornik bluetooth o nazwie “XY-BT” wiszący obok.

Audio z wielu źródeł miksowane jest przez mikser Polycom EF2280 wiszący w szafce ACR01. Dokumentacja i soft.

Mikser może być kontrolowany przez serial który wpięty jest w pudełko obsługujące sound.waw.hackerspace.pl. Odpowiedni suwak znajduje się na iot.waw.hackerspace.pl. Bardziej skomplikowane operacje można wykonywać softem producenta - port szeregowy wystawiony jest na sound.waw.hackerspace.pl na porcie 127.0.0.1:10001. (po odpaleniu socat -d TCP4-LISTEN:10001,fork,reuseaddr /dev/ttyUSB0,b38400,raw,echo=0,crnl)

There are several options to play music/audio in general over network at the hackerspace

• AirPlay/RAOP - autoconfigured via mdns, available on Apple (native), and Linux devices (if enabled)
• Pulseaudio - autoconfigured via mdns, available on Linux (if enabled)
• ROC - manual configuration required, available on Apple, Linux, and Android
• spotifyd - autoconfigured via mdns, allows only playing music from spotify clients, available on devices with spotify apps.

No options for general audio streaming on windows yet.

For Arch Linux systems with Pipewire it is recommended to install pipewire-roc and roc-toolkit

~/.config/pipewire/pipewire.conf.d/sound.hswaw.roc.sink.conf

context.modules = [
    {
        name = libpipewire-module-roc-sink
        args = {
            remote.ip = 10.8.1.16
            remote.source.port = 10001
            remote.repair.port = 10002
            sink.name = "Soundbox@HSWAW"
            sink.props = {
                node.name = "Soundbox@HSWAW"
            }
        }
    }
]

~/.config/pipewire/pipewire-pulse.conf.d/10-network.conf

{
  "pulse.cmd": [
    {
      "args": "module-zeroconf-discover",
      "cmd": "load-module"
    },
    {
      "args": "module-raop-discover",
      "cmd": "load-module"
    }
  ]
}

After you apply configs, use $ systemctl –user restart pipewire if your audio server doesn't load properly, seek help. in KDE Plasma, check System Settings/Audio for ROC sink as that device can hide in audio tray settings.

Streaming to Roc from Android requires an additional app - roc-droid - and streaming doesn't work for everything. The app appears to be using screen capture APIs, and my guess is that DRMed apps can disallow (audio?) capture:

• streaming microphone works
• streaming some apps (eg. mobile firefox playing youtube) works
• streaming some apps (eg. spotify playing locally) doesn't

1. Set 10001 as “port for source stream”
2. Set 10002 as “port for repair stream”
3. Set “10.8.1.16” as IP address of the remote receiver
4. Select local audio source: Microphone or Currently playing apps
5. Click “Start Sender”

AirPlay should be available out-of-the-box on both MacOS and iOS devices. There's (untested) Roc Virtual Audio Device app if anyone wants to try Roc on MacOS

Note: Ten projekt umarł i nie jest już wdrożony. Gniazdo w media boxie na kolumnie jest podłączone bezpośrednio do projektora. Powinno działać. Audio over HDMI nie działa.

tl;dr reimplementujemy soft z “MCU” w HDMI Matrixie na ESP8266, bo cała logika high-speed jest wykonywana na oddzielnym układzie kontrolowanym po I2C. (EP9442) W tym momencie mamy tylko bardzo wyelaborowany switch HDMI (bez HDCP), ale z możliwością zdalnej zmiany EDID.

• I2C z EPF025A wychodzi na R140 i R141

2018/11/12 status: HDMI matrix działa, dostępny w interfejsie

2023/09/22 status: HDMI matrix padł, został zdjęty i czeka na lepsze czasy

• RX* czasami nie wstaje gdy ma podłączony nadajnik przy uruchomieniu?
  • ha ha beka, trzeba dwa razy wykonać init pod rząd i działa…
• TX1 nie działa?
• Brak pełnego softu
• Brak HDCP
• Brak/nieprzetestowane audio capture
• Brak CEC
• Brak odczytywania EDID z TX*
• Nieprzetestowane DVI source

Here are the stages sound goes through that modify its volume/gain:

Going from the end:

• Amplifier gain should be set such that max gain of previous stages results in max loudness we want to allow. If set lower, it won't be possible to crank up volume as desired, which will encourage untrained users to mess with the amplifier. If set higher, we can damage the speakers, people's hearing, and it's likely noise/60Hz hum will be amplified. Gains between amplifiers (rooms) should be set such that all else being equal, both rooms subjectively sound exactly as loud.
• Mixer output is user-controllable via http://iot.waw.hackerspace.pl to adjust volume in a room/between rooms
• Mixer crosspoint is not to be changed. Given two rooms/outputs taking from the same inputs, changing gain here only causes confusion. Again, please do not change.
• Mixer inputs should be set by admin such that all else being equal, different input devices subjectively sound exactly as loud. An exception is made to inputs such as AUX1 - since these sources are directly user-accessible, input gain is user-controllable via IOT to allow user to adjust volume to match