Audio capture and streaming app for webOS 5/6

Captures the TV's audio and sends it out over several transports. The
primary one is HyperHDR: RTP/L16 to a host-side loopback device, since
HyperHDR has no network audio input of its own. A second route renders
the spectrum on the TV and sends FlatBuffers images to port 19400
instead, for setups where touching the host's sound config is not an
option.

  native/       the service: capture backends (PulseAudio, ALSA, exec,
                test tone, all dlopen-based), DSP, and one file per sink
  frontend/     D-pad driven UI at a fixed 1920x1080
  servicefiles/ native service manifest plus the boot script
  host/         RTP receiver and the loopback installer for the HyperHDR
                machine
  tools/        build/package, asset generation, Homebrew Channel
                manifest, on-TV probe
  test/         host-side suites: FlatBuffers and RTP verified against
                real decoders, the engine end to end, the page in jsdom

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

servicefiles/audiocapautostart

@@ -0,0 +1,9 @@
+#!/bin/bash
+# Symlinked into /var/lib/webosbrew/init.d/ by the app's "Start on boot"
+# toggle. The Homebrew Channel runs everything in that directory at boot.
+#
+# Calling any method on the service is enough to launch it; the service then
+# reads its own autoStart setting and starts capturing if it is enabled. Run in
+# the background so a slow bus does not hold up the rest of the boot scripts.
+luna-send -n 1 -f luna://org.webosbrew.audiocap.service/isRunning '{}' &
+exit 0

servicefiles/package.json

@@ -0,0 +1,6 @@
+{
+  "id": "org.webosbrew.audiocap.service",
+  "version": "1.0.0",
+  "description": "Captures TV audio and streams it to HyperHDR and other receivers",
+  "main": "audiocap-service"
+}

servicefiles/services.json

@@ -0,0 +1,12 @@
+{
+  "id": "org.webosbrew.audiocap.service",
+  "description": "Captures TV audio and streams it to HyperHDR and other receivers",
+  "engine": "native",
+  "executable": "audiocap-service",
+  "services": [
+    {
+      "name": "org.webosbrew.audiocap.service",
+      "description": "Audio Cap capture service"
+    }
+  ]
+}