Add YUV display support for android Nougat

[SR]

Hi,

I want to display YUV data directly on display. Currently my set-up(android-x86 nougat) displaying RGB data through HDMI. 

Is there support for YUV (420sp) in surfaceflinger , opengl, drm_gralloc  and mesa ?

Can we display yuv data without opengl shaders ?

Which modules do  I need to modify to add support for YUV display or playback ?

Thanks in advance

[Chih-Wei Huang]

SR <sr4sh...@gmail.com> 於 2018年12月19日 週三 下午5:23寫道：

>
> I want to display YUV data directly on display. Currently my set-up(android-x86 nougat) displaying RGB data through HDMI.
>
> Is there support for YUV (420sp) in surfaceflinger , opengl, drm_gralloc and mesa ?

The simple answer is NO.
You are welcome to contribute it.

> Can we display yuv data without opengl shaders ?
>
> Which modules do I need to modify to add support for YUV display or playback ?

--
Chih-Wei
Android-x86 project
http://www.android-x86.org

[sr4shantan]

Hi chih,

Thanks for the reply.

I have seen NV12 (420sp) code in Mesa platform_android.c under DRI image FourCC. If the pixel format is HAL_PIXEL_FORMAT_YCbCr_420_888 and chroma step is 2 then the format is __DRI_IMAGE_FOURCC_NV12.

If we use drm_gralloc it is using droid_create_image_from_name but the fourcc code gets used in droid_create_image_from_prime_fd.

In drm_gralloc #define GRALLOC_DRM_HANDLE_NUM_FDS 0, if it is zero it is going into droid_create_image_from_name, in which there is no support for YUV.

1). How to invoke FOURCC path droid_create_image_from_prime_fd ?

2). when do we use gbm_gralloc ? which one better compared to drm_gralloc ?

3). Does AMD Ryzen5 GPU uses/supports hw composition ?

Thanks,

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