Uninterrupted Audio Across Lock Screen
Unified the playback state across audio session management, video transitions, and lock screen remote controls, which were previously operating from separate states.
Playback appears straightforward on the surface, but internally it involves multiple concurrent state layers: audio session management, video transitions, and lock screen remote controls. When these states diverge, users encounter issues such as a stalled lock screen display while audio continues, or audio remaining on a previous track after navigating to a new screen. These inconsistencies do not surface in feature checklists, but they directly degrade the reliability of the playback experience.
The core of this work was establishing a single source of truth for playback state. The initialization sequence for audio sessions and track loading, the video loop handling during reel transitions, and the timing of effect attachment and detachment were all aligned to a common state reference. Lock screen and Now Playing remote controls were connected to this unified state, ensuring the displayed metadata always matches what is actually playing. The UI layout was also revised so that playback-related controls read as a coherent single flow rather than a collection of independent elements.
Implementation of the same behavior on the Android runtime remains partially complete. Because the audio processing layer translates even minor inconsistencies into audible quality degradation, the decision was made to finalize the iOS implementation fully before porting.