Otic lets you stream your Android device's microphone input to the local network using ServerSocket and Foreground Service.

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Otic isn't a receiver, so you must have a custom receiver to receive the audio from the Otic client.

The easiest way to do this is to create a virtual microphone using PipeWire/PulseAudio on your Linux machine and source the audio via GStreamer:

#!/bin/bash

VIRTUAL_MIC_SINK="OticMic_Sink"
VIRTUAL_MIC_SOURCE="OticMic"
PHONE_IP="<FIND_IP_FROM_OTIC>"
PORT="<FIND_PORT_FROM_OTIC>"

SINK_MODULE_ID=""
SOURCE_MODULE_ID=""

cleanup() {
    if [ -n "$SOURCE_MODULE_ID" ]; then
        pactl unload-module "$SOURCE_MODULE_ID" 2>/dev/null
    fi
    if [ -n "$SINK_MODULE_ID" ]; then
        pactl unload-module "$SINK_MODULE_ID" 2>/dev/null
    fi
    exit 0
}

trap cleanup EXIT INT TERM

SINK_MODULE_ID=$(pactl load-module module-null-sink \
    sink_name="$VIRTUAL_MIC_SINK" \
    sink_properties=device.description="Otic_Receiver_Sink")

if [ -z "$SINK_MODULE_ID" ]; then
    echo "Failed to create virtual sink"
    exit 1
fi

SOURCE_MODULE_ID=$(pactl load-module module-remap-source \
    master="$VIRTUAL_MIC_SINK.monitor" \
    source_name="$VIRTUAL_MIC_SOURCE" \
    source_properties=device.description="Otic_Receiver")

if [ -z "$SOURCE_MODULE_ID" ]; then
    echo "Failed to create virtual microphone"
    exit 1
fi

echo "Virtual microphone ready"
echo "Connecting to $PHONE_IP:$PORT"

gst-launch-1.0 -v \
    tcpclientsrc host="$PHONE_IP" port="$PORT" ! \
    rawaudioparse use-sink-caps=false format=pcm pcm-format=s16le sample-rate=48000 num-channels=1 ! \
    audioconvert ! \
    audioresample ! \
    pulsesink device="$VIRTUAL_MIC_SINK"

echo "Stream stopped"

Note that sample-rate must be 48000 and the format must be s16le (pcm), as these are the exact values used by the app. <FIND_IP_FROM_OTIC> and <FIND_PORT_FROM_OTIC> should also be replaced with valid values.

Always start streaming from the app first, and then run the script. You might also want to use nohup since the stream terminates when you exit the script.

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