Hi Nicolas, On Tue, 2016-07-12 at 15:14 -0400, Nicolas Dufresne wrote: > Le mardi 12 juillet 2016 à 15:08 -0400, Nicolas Dufresne a écrit : > > Le mardi 12 juillet 2016 à 16:16 +0800, Wu-Cheng Li (李務誠) a écrit : > > > Decoder hardware produces MT21 (compressed). Image processor can > > > convert it to a format that can be input of display driver. > > > Tiffany. > > > When do you plan to upstream image processor (mtk-mdp)? > > > > > > > > It can be as input format for encoder, MDP and display drivers in > > > our > > > > platform. > > > I remember display driver can only accept uncompressed MT21. Right? > > > Basically V4L2_PIX_FMT_MT21 is compressed and is like an opaque > > > format. It's not usable until it's decompressed and converted by > > > image > > > processor. > > > > Previously it was described as MediaTek block mode, and now as a > > MediaTek compressed format. It makes me think you have no idea what > > this pixel format really is. Is that right ? > > > > The main reason why I keep asking, is that we often find similarities > > between what vendor like to call their proprietary formats. Doing the > > proper research helps not creating a mess like in Android where you > > have a lot of formats that all point to the same format. I believe > > there was the same concern when Samsung wanted to introduce their Z- > > flip-Z NV12 tile format. In the end they simply provided sufficient > > documentation so we could document it and implement software > > converters > > for test and validation purpose. > > Here's the kind of information we want in the documentation. > > https://chromium.googlesource.com/chromium/src/media/+/master/base/vide > o_types.h#40 > > // MediaTek proprietary format. MT21 is similar to NV21 except the memory > // layout and pixel layout (swizzles). 12bpp with Y plane followed by a 2x2 > // interleaved VU plane. Each image contains two buffers -- Y plane and VU > // plane. Two planes can be non-contiguous in memory. The starting addresses > // of Y plane and VU plane are 4KB alignment. > // Suppose image dimension is (width, height). For both Y plane and VU plane: > // Row pitch = ((width+15)/16) * 16. > // Plane size = Row pitch * (((height+31)/32)*32) > > Now obviously this is incomplete, as the swizzling need to be documented of course. > Because it's finally a compressed format from our codec hw, we cannot describe its swizzling. best regards, Tiffany > > > > regards, > > Nicolas -- To unsubscribe from this list: send the line "unsubscribe linux-media" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
