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Protocol Simple

The simple protocol provides a bidirectional audio stream on a network socket.

It is meant to be used with the simple protocol player app, available on Android to play and record a stream.

Each client that connects will create a capture and/or playback stream, depending on the configuration options.

You can also use it to feed audio data to other clients such as the snapcast server.

# Module Name

libpipewire-module-protocol-simple

# Module Options

- capture: boolean if capture is enabled. This will create a capture stream or sink for each connected client.
- playback: boolean if playback is enabled. This will create a playback or source stream for each connected client.
- local.ifname = <str>: interface name to use
- local.ifaddress = <str>: interface address to use
- server.address = []: an array of server addresses to listen on as tcp:(<ip>:)<port>.
- capture.props: optional properties for the capture stream
- playback.props: optional properties for the playback stream

# General options

Options with well-known behavior.

- PW_KEY_REMOTE_NAME
- PW_KEY_AUDIO_RATE
- PW_KEY_AUDIO_FORMAT
- PW_KEY_AUDIO_CHANNELS
- SPA_KEY_AUDIO_LAYOUT
- SPA_KEY_AUDIO_POSITION
- PW_KEY_NODE_LATENCY
- PW_KEY_NODE_RATE
- PW_KEY_STREAM_CAPTURE_SINK
- PW_KEY_NODE_NAME
- PW_KEY_TARGET_OBJECT

By default the server will work with stereo 16 bits samples at 44.1KHz.

# Example configuration

# ~/.config/pipewire/pipewire.conf.d/my-protocol-simple.conf
context.modules = [
{ name = libpipewire-module-protocol-simple
args = {
# Provide capture stream, clients can capture data from PipeWire
capture = true
#
# Provide playback stream, client can send data to PipeWire for playback
playback = true
#
#audio.rate = 44100
#audio.format = S16
#audio.channels = 2
#audio.position = [ FL FR ]
#
# The addresses this server listens on for new
# client connections
server.address = [
"tcp:4711"
]
capture.props = {
# The node name or id to use for capture.
#target.object = null
#
# To make the capture stream capture the monitor ports
#stream.capture.sink = false
#
# Make this a sink instead of a capture stream
#media.class = Audio/Sink
}
playback.props = {
# The node name or id to use for playback.
#target.object = null
#
# Make this a source instead of a playback stream
#media.class = Audio/Source
}
}
}
]

# Example configuration for a snapcast server

context.modules = [
{ name = libpipewire-module-protocol-simple
args = {
# Provide sink
capture = true
audio.rate = 48000
audio.format = S16
audio.channels = 2
audio.position = [ FL FR ]
# The addresses this server listens on for new
# client connections
server.address = [
"tcp:4711"
]
capture.props = {
# Make this a sink instead of a capture stream
media.class = Audio/Sink
}
}
}
]
On the snapcast server, add the following to the `snapserver.conf` file:
\code{.unparsed}
[stream]
sampleformat = 48000:16:2
source = tcp://127.0.0.1:4711?name=PipeWireSnapcast&mode=client

Snapcast will try to connect to the protocol-simple server and fetch the samples from it. Snapcast tries to reconnect when the connection is somehow broken.