Linux/DRA72: How to config SGX544 color space map

ya lin

Part Number: DRA72

Tool/software: Linux

hardware: DRA725 custom board
software: ti-processor-sdk-linux-automotive-dra7xx-evm-03_04_00_03

SGX544 will map YUV color space to RGBA while I load
texture with YUV format by function eglCreateImageKHR and glEGLImageTargetTexture2DOES.

There are two methods for this color map.
traditional mothod:
16 <= Y <= 235
16 <= U <= 240
16 <= V <= 240
A = Y - 16
B = U - 128
C = V - 128
R = clip((298*A + 410*C + 128) >> 8)
G = clip((298*A - 101*B - 209*C + 128) >> 8)
B = clip((298*A + 519*B + 128) >> 8)

customer method:
0 <= Y <= 255
0 <= U <= 255
0 <= V <= 255
A = Y
B = U
C = V
R = clip((256*A + 292*C) >> 8)
G = clip((256*A - 100*B - 149*C) >> 8)
B = clip((256*A + 520*B) >> 8)

How to customized the map mothod?

over 7 years ago

0 Anand Balagopalakrishnan over 7 years ago

TI__Expert 5130 points

Hi Ya Lin,

Can you please elaborate on the question?

You are referring to full range vs limited range YUV colors, correct? Is your question how to select either full range or limited range? Or do you have a specific option you want to enable?

Regards,
Anand

0 ya lin over 7 years ago in reply to Anand Balagopalakrishnan

Intellectual 840 points

Hi Anand,

I am concern about how to select either full range or limited range?

Regards,
Ya Lin

0 Anand Balagopalakrishnan over 7 years ago in reply to ya lin

TI__Expert 5130 points

Hi Ya Lin,

We specify this to full range by default. Does your use case need limited range as well?

Regards,
Anand

0 ya lin over 7 years ago in reply to Anand Balagopalakrishnan

Intellectual 840 points

Hi Anand,

I need limited range as well.

Regards,
Ya Lin

0 Anand Balagopalakrishnan over 7 years ago in reply to ya lin

TI__Expert 5130 points

Hi Ya Lin,

We will add this as a feature request and get back to you with ETA. Do you have a specific need date for this feature?

Regards,
Anand

0 ya lin over 7 years ago in reply to Anand Balagopalakrishnan

Intellectual 840 points

Hi Anand,

It's very appreciate for your support!
We hope to get this feature before Christmas.

Regards,
Ya Lin

0 Anand Balagopalakrishnan over 7 years ago in reply to ya lin

TI__Expert 5130 points

Hi Ya Lin,

We will provide this feature by end-Oct.

Regards,
Anand

0 Ramprasad over 7 years ago in reply to Anand Balagopalakrishnan

TI__Mastermind 30480 points

Hi Ya Lin,
There is an attribute to set the YUV range. But this is a hint to SGX driver whether YUV is in full range or limited range.
Attribute name : EGL_SAMPLE_RANGE_HINT_EXT
Accepted values : EGL_YUV_FULL_RANGE_EXT and EGL_YUV_NARROW_RANGE_EXT.

Example:

EGLint __attr[] = {
EGL_WIDTH, buf->width,
EGL_HEIGHT, buf->height,
EGL_LINUX_DRM_FOURCC_EXT, DRM_FORMAT_YUYV,
EGL_DMA_BUF_PLANE0_FD_EXT, dfd,
EGL_DMA_BUF_PLANE0_OFFSET_EXT, 0,
EGL_DMA_BUF_PLANE0_PITCH_EXT, buf->pitches[0],
EGL_SAMPLE_RANGE_HINT_EXT, EGL_YUV_NARROW_RANGE_EXT,
EGL_NONE
};

egl_img = eglCreateImageKHR(display, EGL_NO_CONTEXT, EGL_LINUX_DMA_BUF_EXT, NULL, attr);
For NARROW range conversion to RGB is using traditional method(16 < Y < 235) and for FULL range, (0 < Y < 255)
Is this what you are looking for? Can you check if you are getting desired results with these settings?

Thanks
Ramprasad

0 ya lin over 7 years ago in reply to Ramprasad

Intellectual 840 points

Hi Ramprasad

It's a good solution, thank you!

Ya Lin

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Linux/DRA72: How to config SGX544 color space map