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Date: Tue, 12 Jul 2016 15:08:31 -0400 From: Nicolas Dufresne <nicolas.dufresne@...il.com> To: Wu-Cheng Li (李務誠) <wuchengli@...omium.org>, tiffany lin <tiffany.lin@...iatek.com> Cc: Hans Verkuil <hverkuil@...all.nl>, Hans Verkuil <hans.verkuil@...co.com>, Daniel Thompson <daniel.thompson@...aro.org>, Rob Herring <robh+dt@...nel.org>, Mauro Carvalho Chehab <mchehab@....samsung.com>, Matthias Brugger <matthias.bgg@...il.com>, Daniel Kurtz <djkurtz@...omium.org>, Pawel Osciak <posciak@...omium.org>, Eddie Huang <eddie.huang@...iatek.com>, Yingjoe Chen <yingjoe.chen@...iatek.com>, devicetree@...r.kernel.org, linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org, linux-media@...r.kernel.org, linux-mediatek@...ts.infradead.org, Lin PoChun <PoChun.Lin@...iatek.com> Subject: Re: [PATCH v3 3/9] DocBook/v4l: Add compressed video formats used on MT8173 codec driver 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. regards, Nicolas
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