Android mpv drew every frame through vo=gpu: an ImageReader/GLES copy
pinned to 8-bit RGB0 with a 100 ms timed wait per frame, which
truncated 10-bit and HDR output, raced acquireLatestImage, and
performed badly on low-end TVs.
Video now scans out on a SurfaceFlinger video plane through the fork's
vo=mediacodec: decoder buffers are queued to the surface at their
target PTS (av_mediacodec_release_buffer_at_time), so 10-bit and HDR
dataspaces reach the display untouched and frame pacing no longer
depends on GL vsync. Subtitles and OSD render on a sibling transparent
surface presented for the same PTS, frame-locked by construction.
The plane takes decoder buffers only, so software-decoded video stays
on a GL vo, with a chain-failure watchdog re-initializing the output
when the plane refuses a stream mid-session. The GL fallback is vo=gpu
- gpu-next breaks the Tegra GLES linker (#2010) - and GpuVoPolicy
selects gpu-next only when Dolby Vision RPU reshaping needs
libplacebo. AV1 film grain is applied in the decoder
(vd-lavc-film-grain=cpu) because the GL raster grain fallback is not
available on this path.
Pins libmpv-android v1.1.3, which carries the fork patches this path
rides on: the vo itself, BT2020-PQ EGL window surfaces, GLES direct
rendering treated as slow (H.264 Hi10P software decode on Tegra went
from 0.3x realtime with wrong colors to 1.0x with correct 10-bit
output), and multichannel IEC61937 for ao_audiotrack.
Verified on Shield Pro (Tegra/GLES), Pixel 7 (Mali), Box R 4K Plus
(Amlogic armv7), and Galaxy Z Fold3 (Adreno): 520 play/teardown cycles
and 3 hours of continuous 4K HDR playback; HDR engagement confirmed
via SurfaceFlinger dataspace BT2020_ITU_PQ.
edde746
a1c98b9d27