NTSC/PAL/SECAM video decoder source code

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tigger

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pal decoder c code

Does anyone have any kind of video decoder source code in Verilog/VHDL? www.opencores.org has a video encoder, but there is no decoder. I just want to experiment different comb filtering techniques.

If no decoder source is available, I'd appreciate if anyone can provide me info on the implementation of Y/C filter (i.e. how many taps are good enough and what are the coefficients). Many books describe the theory but don't mention any empirical data.
 

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tigger,
Could you point me to the opencores video encoder page? I know it was there a month ago, however, I can't find it any more. (of course I've downloaded everything, just curious where it moves)

Video decoder is much more difficult to implement than an encoder for two reasons: Y/C separation, i.e., notch+comb filtering; and sync/clock generation (traditional method, new technique uses single 27MHz and does interpolation instead of PLL, well then you need to take care of the interp parameters)

I dont believe there will be any free decoder IP out there because not many people are doing this except a few consumer electronics giants.

PM me if you'd like to know more about internals of decoder.

casual3
 

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casual3_2002,

I remember seeing this post.

https://www.opencores.com/forums/video/2003/10/00000

There was quite a few other nasty replies that I remember seeing from people that were hoping to use this for products.

There seemed to be a bit of a pissing match and my guess is that the core was revoked. If you have it, feel fortunate.

robotman
 

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robotman said:
I remember seeing this post.
https://www.opencores.com/forums/video/2003/10/00000
Click to expand...

robotman,

Thanks a lot! I dont know if the post is true or not, if so, I would need to spend more time verifying my code, because I DID use his multiplier module (one of the 4 bugged modules)which I dont have time to test yet. Thanks again for this precious piece of info. This is worth at least several hundred bucks

casual3
 

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Thanks for the info. Both encoders were indeed revoked from opencores.org.

I know a free IP is difficult to find, but does anyone have a demo code in C or Matlab such that I can at least get the filter paramters? I have written a Matlab decoder using filtfilt() function, but hardware implementation is a whole different story. I just want to know the filters are done in hardware.
 

ntsc decoder ip

who has NTSC/PAL video decoder IP?

If you have this IP, could you exchange it with my IPs?
 

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"...exchange..." ??? why not first offer what you have ?
 

vhdl source code pal video encoder

Hi all,

I want to understand the video decoder.

Would you please recommand some books to me ?

I have the book "VIDEO Demystified" but I feel that it is not suitable for the fresher .

Thank you !!!
 

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