hello suchao,
LegacyRGBA it is RGBA-8-8-8-8 planar
Argus it processed CSI camera with bayer raw formats, it could be Raw10, Raw12…etc. it’s processed by ISP and convert as YUV buffer for post-processing, display rendering.
are you going to develop camera use-case with RGBA?
you’ll need to convert the formats, such as YUV to RGBA for your test-pipeline.
please see-also Topic 165300 to do format conversion.