fix(player): restart the native renderer when returning from background audio

With native video on, coming back from background audio left a black screen: a
play overlay pinned at 0:00, a seek bar at zero, and a play button that did
nothing. Nothing crashed — the process stayed up and the frontend kept logging —
the transition was simply dropped.

The two render paths resume by different means, and exitBackgroundAudioHandoff
only ever performed one of them. The webview <video> reloads off its stream URL:
an $effect watches it, reinitialises HLS or sets element.src, and canplay drives
the seek and play. ExoPlayer owns no element and nothing watches the URL on its
behalf — native playback is only ever started by an explicit player_play_item
plus adapter load, which the component issues once, from onMount. So reassigning
the URL restarted precisely nothing, and since player_exit_background_audio had
already stopped the handoff's audio player, the backend came back holding no item
at all. That is why the play button was inert: there was nothing loaded to play.

The return now re-issues that pair on the native path, in the same order as the
initial load, carrying the position the audio reached. Subtitle configurations are
reused from the ones resolved at mount — ExoPlayer sideloads them as
MediaItem.SubtitleConfigurations and cannot accept one after prepare().

Which path to take is decided by planHandoffReturn, a pure helper in
backgroundAudioHandoff.ts, so the branch is unit-testable without mounting the
player. It also folds in shouldResumeOnForeground, so a pause taken on the
lockscreen during the handoff still wins over the snapshot captured on the way
out.

Verified on device (HONOR ROD2-W09, Android 16): handoff to audio-only at 69:54,
return restored native video playing at 70:18. Previously the same sequence left
the player idle and black.

The requirements count pin in extract-traces.test.ts moves with the new DR-196.

This commit is contained in:

dtourolle

2026-08-16 22:10:14 +02:00

parent 1285908733

commit 5e8efa252e

11 changed files with 792 additions and 416 deletions

docs/traceability.md

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