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Aligning External Playback Controls with Audio State

2025.12.22Technical Log#product-ui#playback#sound-engine

Resolved inconsistencies between lock screen / notification controls and in-app playback state, and restructured the playback pipeline and audio effects processing.

When users control playback from the lock screen or notification area, the app's internal state could fall out of sync. These inconsistencies do not surface in feature specifications but directly degrade the reliability of the playback experience. This update ensures that external control signals are immediately reflected in the playback pipeline, and that pause handling no longer blocks unrelated operations.

On the presentation side, timer handling logic and surrounding UI rendering were revised, and the rules for determining content accessibility were clarified. The same criteria were applied to both the discovery and recommendation surfaces to ensure consistent content exposure.

On the audio processing side, the spatial effects pipeline was restructured so that reverb operates reliably within the playback path. The core objective was to guarantee a consistent playback state regardless of whether the user is actively viewing the screen.