Tencent Music Tech Team
Jan 12, 2019 · Mobile Development
Technical Solution and Performance Optimization for Animated Lyrics Using ASS Subtitle Rendering on Mobile
The project replaces karaoke effects with ASS‑based lyrics on Android, using a backend to generate ASS files and a JNI renderer that rasterizes and composites bitmap fragments; optimizations like transparent‑fragment filtering, opacity early‑out, NEON SIMD, copy elimination, and double‑buffered decoding cut frame time from 52 ms to under 3 ms, raise frame rate from 7 fps to 15 fps, and shrink memory usage from 180 MB to under 10 MB.
ASS subtitleJNINEON optimization
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