问题
I'm looking for an API that I can use to decode a digital sample of an analog signal, encoded according to the http://en.wikipedia.org/wiki/NTSC">NTSC standard. I'm willing to consider both free and commercial options. If I have to, I'll roll the code myself, but I imagine that this code has been written tens or hundreds of times in the past few decades, so I'm hoping there's something out there I can adapt.
Do you know of such an API?
UPDATE: It seems that this code hasn't necessarily been written as many times over as I'd hoped. The solved problem, apparently, is dealing directly with the analog input via particular devices. What I'm looking for is an algorithm that takes as input a direct digital sample of the analog signal (with sufficient resolution to pick up the changes specified in the standard) and returns a video picture, similar to what http://www.physicsforums.com/archive/index.php/t-47403.html">this person wanted and had to build himself.
回答1:
I know that some code for this task exists for GNU Radio, though I don't know if it ever got past black&white reception:.
- http://www.nabble.com/NTSC-Receiver-td9123494.html
- http://www.mail-archive.com/discuss-gnuradio@gnu.org/msg01265.html
There is also a GNU Radio ATSC transceiver that is more complete, though not what you were looking for.
回答2:
Years later ... This guy has built a decoder in software. Source code is supplied.
回答3:
The decoding of NTSC into separate R,G,B components with syncing signals has been done in hardware for such a very long time that it is cheap and easy. There hasn't been any incentive for anyone to try it in software.
回答4:
What you need is the Microsoft DirectShow API. Check this link for API and help: http://msdn.microsoft.com/en-us/library/ms783323.aspx
I am not sure but Silverlight also probably has the capability you are looking for.
来源：https://stackoverflow.com/questions/458037/do-you-know-of-a-ntsc-decoder-api