master landed DR-148 and DR-149 for unrelated audio-decode work (0.4.7/0.4.8)
while this branch was in flight, and both sides claimed the same two IDs. The
native-video requirements move to DR-150 (native rendering behind the flag),
DR-151 (the severed SurfaceView attach chain) and DR-152 (capabilities reported
by Rust). UT-090 was likewise already taken by the seek-bar test, so the adapter
selection test moves to UT-149 and is registered in the table.
The spec header also cited DR-023/DR-024, which are the subtitle and audio-track
selection UI requirements — unrelated to this work. Corrected, with a note so the
wrong IDs are not reintroduced from the draft.
extract-traces.test.ts asserts the live requirement counts on purpose, so adding
three DRs moves DR 144→147 and total 282→285.
Subtitles on the native path are not a regression from this branch: master's
6a712c4 already fixed the root cause (MediaItem.subtitles was hardcoded to
vec![], so ExoPlayer always received zero SubtitleConfigurations) and that fix is
now underneath these commits.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
The spike's central question — can a SurfaceView be composited behind a
transparent Tauri WebView on Android — is answered yes, verified on a physical
device. No upstream issue blocked it and none demonstrated it; this appears to
be the first working instance.
Marks DR-148 done behind the flag and records what is confirmed versus what is
still open: playback and positioning are verified, but the individual native
controls (seek, audio-track, subtitle), the mini-player transition, and the
MediaCodec hardware-decode claim are not yet each measured. The mini-player
transition is called out as the known gap, since it is the one case where the
fullscreen assumption behind "no rect plumbing needed" does not hold.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Rust already reported `use_html5_element: false` on Android, but two frontend
overrides threw that answer away, so ExoPlayer's video path had never actually
run. Both are lifted behind an `experimentalNativeVideo` opt-in (default off).
The flag is a suppressor, never a promoter: off forces HTML5 even where Rust
says native, so an in-progress spike cannot ship as the default, but it can
never select native where Rust reported HTML5 — Linux cannot composite behind
WebKitGTK, and promoting there would be a black screen.
Two blockers the spec did not anticipate, both in code assumed to be merely
unreachable rather than broken:
- `JellyTauPlayer.setActivity()` had zero callers, so `currentActivity` was
always null and `autoAttachSurface()` bailed. The SurfaceView was created and
wired to ExoPlayer but never added to the view hierarchy — video would have
decoded to a surface that was never on screen, whatever the webview did.
This also revives PiP on the video path, which gated on the same flag.
- `createAdapter()` was not the real gate; it is never called in production.
The actual override was in VideoPlayer.svelte, which forced HTML5 and stopped
the native backend `player_play_item` had just started. Both sites now route
through `createAdapter()`.
Compositing needs two independent opaque layers cleared, not one. Clearing only
the page leaves the WebView widget opaque — audio over a black picture, exactly
the symptom the old INTERIM comment described. `videoSurface.ts` toggles both:
the widget background and window drawable from Kotlin, the page backgrounds via
a `data-native-video` attribute keyed by app.css. Transparency lives in
`tauri.android.conf.json` so Linux keeps an opaque window, and is scoped to the
playback session so the launcher never shows through the rest of the app.
Phase 3's rect plumbing turned out to be unnecessary: video is fullscreen on the
player route, and `fitSurfaceToScreen()` already letterboxes and re-fits on
rotation. The mini-player transition remains unverified on device.
Also removes the `navigator.userAgent` sniffing in webviewAudio.ts, which was a
second copy of the Rust cfg gate free to drift from it. `player_get_capabilities`
now reports `usesWebviewAudio` and `supportsNativeVideo` from those same gates.
Tests: adapter selection covers the full matrix, including the regression guard
that the flag off beats Rust. Written first and confirmed failing (2 of 7) before
the fix.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Investigation into unifying the playback backends (Linux/MPV, Android/ExoPlayer,
Windows/webview) onto one engine with hardware acceleration. Conclusion: video
cannot be unified onto a native engine; audio can.
The blocker is not mpv-specific. WebKitGTK, WebView2 and Android WebView each
draw into their own compositor surface, so a native video surface sits either
entirely above or entirely below the webview and cannot interleave with HTML.
GStreamer and libVLC fail identically. mpv would additionally regress streaming:
it has no adaptive bitrate, while the current hls.js path does.
Six specs added:
- playback-backend-unification: the analysis and decision, with evidence
- android-audio-settings-parity: set_audio_settings on ExoPlayerBackend
- android-native-video-spike: timeboxed test of SurfaceView compositing
- windows-native-audio-backend: replace the webview <audio> shim with libmpv
- libmpv2-migration: dead libmpv git pin -> libmpv2, plus a LICENSE file
- playback-docs-corrections: the requirement-status fixes applied here
Corrections to requirements.md, all verified against source:
- UR-031/DR-034 claimed crossfade was "Done (Linux only)". It is implemented
nowhere (mpv_backend.rs has a bare TODO) and is architecturally blocked on
mpv, whose single-stream audio chain cannot feed acrossfade's two inputs.
- Parity matrix listed crossfade as a Linux/Android gap; it is neither.
- The matrix omitted the equalizer, which has the same Linux-only shape.
- The suggested ConcatenatingMediaSource is deprecated in current Media3.
nativeAdapter.ts cited tauri#10152 as an upstream blocker for native Android
video. That issue is a stale feature request, dead since 2024-07-01; the
capability shipped in tauri 27d01834 (2024-09-02), and the related
black-screen bug was fixed in wry 0.39.4 (we ship 0.55.x). What is genuinely
unproven is SurfaceView-behind-WebView compositing, which the spike now tracks.
dtourolleandClaude Opus 5