SAA7111 YUV

[Wang Feng]

Hi,

I have stored YUV422 16 bit data from Philips SAA7111A. The Y data and UV
data
in 2 files. Now how to combine Y and UV
into RGB format for display on PC?

Please reply to fwang11@pub3.fz.fj.cn

Thanks in advance.

Wang, Feng

 

[Kelvin @ SG]

a simple C program can do that...one RGB format is called BMP...
google YUV to RGB conversion and see...

Kelvin





Wang Feng <fwang11@pub3.fz.fj.cn> wrote in message
news:c4l7v6$rkf$1@news.yaako.com...

Hi,

I have stored YUV422 16 bit data from Philips SAA7111A. The Y data and UV
data
in 2 files. Now how to combine Y and UV
into RGB format for display on PC?

Please reply to fwang11@pub3.fz.fj.cn

Thanks in advance.

Wang, Feng

 

[claps]

Hi,

I can help you with this issue by providing you transformation formulaes.

However, please note that the formula heavily depends on the settings of
the SAA7111A. AND NOBODY USUALLY TELLS YOU ABOUT THIS !!!

So :

1) what are the values of your registers 0B, 0C and 0D. Namely BRIG , CONT
and SATN ???

You have to understand that no mathematics will work unless you know how
you've set-up the chip.

Talk to you later,

Regards,

Claps

 

[Gabor Szakacs]

Philips publishes the algorithm they use in their own
media processors (PNX 1300 series). See:
http://www.semiconductors.philips.com/acrobat/literature/9397/75009542.pdf
Chapter 14 talks about the image coprocessor and includes the algorithms.

Wang Feng <fwang11@pub3.fz.fj.cn> wrote in message
news:c4l7v6$rkf$1@news.yaako.com...

Hi,

I have stored YUV422 16 bit data from Philips SAA7111A. The Y data and UV
data
in 2 files. Now how to combine Y and UV
into RGB format for display on PC?

Please reply to fwang11@pub3.fz.fj.cn

Thanks in advance.

Wang, Feng

 

[Gabor Szakacs]

Sorry I posted a link to the glossy sales literature.
The data sheet is at:

http://www.support.trimedia.philips.com/trimedia/Download/pnx1300-CQS.pdf

This has the algoriths in chapter 14

Wang Feng <fwang11@pub3.fz.fj.cn> wrote in message
news:c4l7v6$rkf$1@news.yaako.com...

Hi,

I have stored YUV422 16 bit data from Philips SAA7111A. The Y data and UV
data
in 2 files. Now how to combine Y and UV
into RGB format for display on PC?

Please reply to fwang11@pub3.fz.fj.cn

Thanks in advance.

Wang, Feng

 

[Jan Panteltje]

On a sunny day (10 May 2004 15:14:15 -0700) it happened gabor@alacron.com
(Gabor Szakacs) wrote in <8a436ba2.0405101414.243d7b94@posting.google.com>:

Sorry I posted a link to the glossy sales literature.
The data sheet is at:

http://www.support.trimedia.philips.com/trimedia/Download/pnx1300-CQS.pdf

This has the algoriths in chapter 14
panteltje:~/download/html# wget http://www.support.trimedia.philips.com/trimedia/Download/pnx1300-CQS.pdf

--01:13:57-- http://www.support.trimedia.philips.com/trimedia/Download/pnx1300-CQS.pdf
=> `pnx1300-CQS.pdf'
Connecting to www.support.trimedia.philips.com:80... connected!
HTTP request sent, awaiting response... 401 Authorization Required
Connecting to www.support.trimedia.philips.com:80... connected!
HTTP request sent, awaiting response... 401 Authorization Required
Authorization failed.
JP

 

[Gabor Szakacs]

O.K. that site requires registration

Here's a clip from the datasheet:

14.5.4 YUV to RGB Conversion

In the ICP, YUV to RGB conversion is done by sequentially
processing triplets of Y, U, and V pixel data to convert
the pixels to an internal YUV 4:4:4 format and applying
the YUV to RGB conversion algorithm on the YUV
4:4:4 pixels. The results of this conversion normally go to
the PCI bus but can also go back to SDRAM.
YUV to RGB conversion has two steps. First the Y, U and
a V pixel data are used to generate an RGB pixel at the
output location. When the Y,U, and V pixels are ready,
YUV to RGB conversion is performed using the following
algorithms:
R = Y + 1.375(V)= Y + (1 + 3/8)(V)
G = Y - 0.34375(U) - 0.703125(V)
= Y - (11/32)(U) - (45/64)(V)
B = Y + 1.734375(U)
= Y + (1 + 47/64)(U)

In CCIR601, the U and V values are offset by +128 by inverting
the most significant bit of the 8-bit byte. This is the
way the U and V values are stored in SDRAM. The above
algorithms assume that the U and V values are converted
back to normal signed two's complement values by inverting
the MSB before being used.

....

The values used are not exactly those specified in the CCIR601
specification, but they seem to work quite well and the constants
make for small multipliers.

Jan Panteltje <pNaonStpealmtje@yahoo.com> wrote in message news:<c7p2e5$h8$1@news.epidc.co.kr>...

On a sunny day (10 May 2004 15:14:15 -0700) it happened gabor@alacron.com
(Gabor Szakacs) wrote in <8a436ba2.0405101414.243d7b94@posting.google.com>:

Sorry I posted a link to the glossy sales literature.
The data sheet is at:

http://www.support.trimedia.philips.com/trimedia/Download/pnx1300-CQS.pdf

This has the algoriths in chapter 14
panteltje:~/download/html# wget http://www.support.trimedia.philips.com/trimedia/Download/pnx1300-CQS.pdf
--01:13:57-- http://www.support.trimedia.philips.com/trimedia/Download/pnx1300-CQS.pdf
=> `pnx1300-CQS.pdf'
Connecting to www.support.trimedia.philips.com:80... connected!
HTTP request sent, awaiting response... 401 Authorization Required
Connecting to www.support.trimedia.philips.com:80... connected!
HTTP request sent, awaiting response... 401 Authorization Required
Authorization failed.
JP