Add extension and native code

extension/background.js

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+function onResponse(response) {
+    let dropdown = document.getElementById('dropdown');
+
+    let allDesktopAudioOption = document.createElement('option');
+    let allDesktopAudioText = 'All Desktop Audio';
+    allDesktopAudioOption.innerHTML = allDesktopAudioText;
+    allDesktopAudioOption.value = allDesktopAudioText;
+    dropdown.appendChild(allDesktopAudioOption);
+
+    for (const element of response) {
+        let option = document.createElement('option');
+        option.innerHTML = element;
+        option.value = element;
+        dropdown.appendChild(option);
+    }
+}
+
+function onError(error) {
+    console.error(error)
+}
+
+//let sending = browser.runtime.sendNativeMessage("screenAudioMicConnector", { cmd: "StartVirtmic", args: [{ node: '' }] });
+//let sending = browser.runtime.sendNativeMessage("screenAudioMicConnector", { cmd: "StopVirtmic", args: [{ micPid: 0 }] });
+let sending = browser.runtime.sendNativeMessage("screenAudioMicConnector", { cmd: "GetNodes", args:[]} );
+sending.then(onResponse, onError);

extension/index.js

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+function overrideGdm() {
+    navigator.mediaDevices.chromiumGetDisplayMedia = navigator.mediaDevices.getDisplayMedia;
+
+    const getAudioDevice = async (nameOfAudioDevice) => {
+        await navigator.mediaDevices.getUserMedia({
+            audio: true
+        });
+        await new Promise(r => setTimeout(r, 1000));
+        let devices = await navigator.mediaDevices.enumerateDevices();
+        let audioDevice = devices.find(({
+            label
+        }) => label === nameOfAudioDevice);
+        return audioDevice;
+    };
+
+    const getDisplayMedia = async () => {
+        var id;
+        try {
+            let myDiscordAudioSink = await getAudioDevice('screenaudio-mic');
+            id = myDiscordAudioSink.deviceId;
+        }
+        catch (error) {
+            id = "default";
+        }
+        let captureSystemAudioStream = await navigator.mediaDevices.getUserMedia({
+            audio: {
+                // We add our audio constraints here, to get a list of supported constraints use navigator.mediaDevices.getSupportedConstraints();
+                // We must capture a microphone, we use default since its the only deviceId that is the same for every Chromium user
+                deviceId: {
+                    exact: id
+                },
+                // We want auto gain control, noise cancellation and noise suppression disabled so that our stream won't sound bad
+                autoGainControl: false,
+                echoCancellation: false,
+                noiseSuppression: false
+                // By default Chromium sets channel count for audio devices to 1, we want it to be stereo in case we find a way for Discord to accept stereo screenshare too
+                //channelCount: 2,
+                // You can set more audio constraints here, bellow are some examples
+                //latency: 0,
+                //sampleRate: 48000,
+                //sampleSize: 16,
+                //volume: 1.0
+            }
+        });
+        let [track] = captureSystemAudioStream.getAudioTracks();
+        const gdm = await navigator.mediaDevices.chromiumGetDisplayMedia({
+            video: true,
+            audio: true
+        });
+        gdm.addTrack(track);
+        return gdm;
+    };
+
+    navigator.mediaDevices.getDisplayMedia = getDisplayMedia;
+}
+
+const newScript = document.createElement('script')
+newScript.innerHTML = `${overrideGdm.toString()}; overrideGdm();`.replaceAll('overrideGdm', '__overrideGdm')
+document.body.appendChild(newScript)

extension/manifest.json

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+{
+
+  "manifest_version": 3,
+  "name": "screenaudio-mic",
+  "version": "1.0",
+
+  "description": "Passthrough pipewire audio to WebRTC screenshare",
+
+  "browser_specific_settings": {
+    "gecko": {
+      "id": "screenaudio-mic@icedborn"
+    }
+  },
+
+  "action": {
+    "default_popup": "popup.html"
+  },
+
+  "icons": {
+    "48": "icons/icon.png"
+  },
+
+  "content_scripts": [
+    {
+      "matches": ["<all_urls>"],
+      "js": ["index.js"]
+    }
+  ],
+
+  "background": {
+    "scripts": ["background.js"]
+  },
+
+  "permissions": [
+    "nativeMessaging"
+  ]
+
+}

extension/popup.html

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+<!DOCTYPE html>
+<html>
+<head>
+    <title>Screenaudio Mic</title>
+</head>
+<body style="background: #202324; color: #e8e6e3;">
+    <div>
+        <h3 style="text-align: center;">Select audio node to share</h3>
+        <select style="background: #202324; color: #e8e6e3;" id="dropdown"></select>
+        <button style="background: #202324; color: #e8e6e3;" onclick="">Share</button>
+    </div>
+</body>
+<script src="background.js"></script>
+</html>

native/message-parser.c

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+#include <stdio.h>
+#include <stdlib.h>
+
+int main (int argc, char *argv[]) {
+  size_t INT_SIZE = sizeof(int);
+  unsigned char* buffer;
+
+  buffer = (unsigned char*)malloc(INT_SIZE);
+  for (int i = 0; i < INT_SIZE; i++)
+    buffer[i] = getchar();
+
+  /*
+  for (int i = 0; i < INT_SIZE / 2; i++) {
+    unsigned char temp = buffer[i];
+    buffer[i] = buffer[INT_SIZE - 1 - i];
+    buffer[INT_SIZE - 1 - i] = temp;
+  }
+  */
+
+  int charactersToRead = *(int*)buffer;
+  // printf("charactersToRead: %d", charactersToRead);
+  free(buffer);
+
+  buffer = (unsigned char*)malloc(charactersToRead + 1);
+  buffer[charactersToRead] = '\0';
+  for (int i = 0; i < charactersToRead; i++)
+    buffer[i] = getchar();
+
+  printf("%s", buffer);
+  free(buffer);
+
+  return 0;
+}
+

native/native-messaging-hosts/screenAudioMicConnector.json

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+{
+  "name": "screenAudioMicConnector",
+  "description": "Connector to communicate with the browser",
+  "path": "/home/icedborn/dev/screenaudio-mic/native/screenAudioMicConnector",
+  "type": "stdio",
+  "allowed_extensions": [
+    "screenaudio-mic@icedborn"
+  ]
+}

native/screenAudioMicConnector

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+#!/usr/bin/env bash
+
+export LANG=C
+projectRoot="$( cd -- "$(dirname "$0")" > /dev/null 2>&1 ; pwd -P )"
+
+function intToHex () {
+  printf '%08x' $1 |
+    sed 's/\(.\)\(.\)\(.\)\(.\)\(.\)\(.\)\(.\)\(.\)/\7\8\n\5\6\n\3\4\n\1\2/'
+}
+
+function toMessage () {
+  local message="$1"
+  local messageLength=`printf "$message" | wc -c`
+  local messageLengthHex=`intToHex "$messageLength"`
+
+  printf "$messageLengthHex\n" | while IFS= read -r line; do
+    sh -c "printf '\\x$line'"
+  done
+
+  printf "$message"
+}
+
+function GetNodes () {
+  local nodes=`pw-cli ls Node | grep node.name | awk '{print $3}' | sort | uniq | sed 's|\"||g' | jq -R . | jq -s . | jq -c`
+  toMessage "$nodes"
+  exit
+}
+
+function StartVirtmic () {
+  local args="$1"
+  local node=`echo $args | jq -r '.[].node' | head -n 1`
+
+  echo $node | nohup ~/git/screenaudio-mic/build/screenaudio-mic > /dev/null &
+  local micPid=$!
+
+  toMessage '{"micPid":'$micPid'}'
+
+  exit
+}
+
+function StopVirtmic () {
+  local args="$1"
+  local micPid=`echo $args | jq '.[].micPid' | head -n 1`
+
+  kill "$micPid" && toMessage '{"success":true}' && exit
+
+  toMessage '{"success":false}'
+  exit
+}
+
+payload=`$projectRoot/a.out`
+cmd=`echo "$payload" | jq -r .cmd`
+args=`echo "$payload" | jq .args`
+
+case $cmd in
+  'GetNodes')
+    GetNodes "$args"
+    ;;
+  'StartVirtmic')
+    StartVirtmic "$args"
+    ;;
+  'StopVirtmic')
+    StopVirtmic "$args"
+    ;;
+esac