webOS topic

LG webOS TVs, webOS 26 on, run the package through flutter-webos, LG's Flutter 3.38.10 for webOS. flutter-webos runs no build hook, so the package is an FFI plugin there: its webos/CMakeLists.txt downloads libmpv_webos-armv7l.so of the release the package pins, checks its SHA-256 and bundles it in the app's lib/ as libmpv_audio_kit_webos.so. MpvAudioKit.ensureInitialized opens that file when no libmpv is given.

Build

Set up flutter-webos and LG's webOS NDK as LG's guide says, then build as usual:

flutter-webos build webos --release

The first build downloads the library, so it needs network access. The library is 32-bit ARM, the TVs' arch: a build with --target-arch arm64 fails, as there is no libmpv for it.

A libmpv of your own

The libmpv user define of the build hook does not reach webOS. Set MPV_AUDIO_KIT_LIBMPV in the environment of the build instead: a file, or a directory with libmpv_webos-armv7l.so. It must be a build of libmpv-scripts at the release the package pins.

MPV_AUDIO_KIT_LIBMPV=/path/to/libmpv_webos-armv7l.so flutter-webos build webos --release

Audio

The library plays through ALSA, the sound API of the webOS NDK. The media session has no webOS side: turning it on does nothing there.

What was checked

LG has no emulator for native apps. A workflow of the package builds an app with flutter-webos and runs it under qemu-arm on the system libraries of the webOS NDK, the TVs' glibc and ALSA, with ALSA writing to a file: the app plays an asset past 2 seconds through ALSA, and its 440 Hz tone is in what ALSA wrote. What only a TV shows, its sandbox and its sound server, is not checked yet.

Classes

MpvAudioKit

One-time initialization for mpv_audio_kit. Owns the choice of the libmpv the players use and the cleanup of the cores that leaked across Flutter Hot-Restarts, both of which the backend carries out.