Claude, port gr-fosphor to Android. 30min later...
fosphor-cl: [+] Available device: 0:0 <ARM> Mali-G715 r0p0
fosphor-cl: [+] Selected device: Mali-G715 r0p0
fosphor : [+] GL_RENDERER: Mali-G715
fosphor : [+] GL_VERSION: OpenGL ES 3.2 v1.r54p2-00eac0.c8c70f02abaa302607998c919face0f4
Crazy times we live in..
After quite some reverse-engineering, the recent MS2130S-based capture dongles are now supported by hsdaoh: https://github.com/steve-m/hsdaoh/commit/13d832966bd95d44fcfb5295defc3efb5b232596
They completely changed the register layout and I had to figure out (again) how to enable raw YUV capture. The fun part was also extending emu8051 with code-banking support to be able to emulate the (now bigger) firmware. In theory raw RGB capture should be possible now, but this will take some more effort.