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Old 4th August 2003, 08:13   #1  |  Link
kevina
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AVISynth C API Now Available

I have just released a compiler neutral C Interface to AviSynth in the forum of a plugin. You can find it at http://kevin.atkinson.dhs.org/avisynth_c/. The current version is 0.14.

I would really appreate it if some AVISynth developers could look it over and give me some feedback. I am hoping that eventually it can become part of AVISynth.

It currently is designed for AVISynth 2.5.

Enjoy.

Last edited by kevina; 10th September 2003 at 05:22.
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Old 4th August 2003, 08:30   #2  |  Link
sh0dan
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First impression is good - I'll have a closer look ASAP.
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Old 5th August 2003, 14:28   #3  |  Link
sh0dan
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I took a few minutes and made an attempt at integrating it into the core. I tried to implement it, so it would work seamless, and results look promising.

avisynth_c.dll seems to be required for other plugins to load - no problem - it can be included in the installation package. It does however not have to be loaded as a plugin when it is part of the core.

LoadPlugin automatically remaps C-plugins to "LoadCPlugin", if a C-plugin is detected.

I get a bunch of errors like "D:\dev\avisynth2\avisynth\avisynth_c.cpp(58) : warning C4273: 'avs_release_video_frame' : inconsistent dll linkage. dllexport assumed."

Are you interested in having C-plugins put into the core?? It seems to work very nicely!
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Old 5th August 2003, 15:15   #4  |  Link
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Yes I am interested in integrating it into the core. It has not been tested very well, so for right now I rather have it as a plugin since it makes updating it easier....

I am not sure why you are getting those errors. You might need to define AVISYNTH_C_EXPORTS.

If it is integrated in the core avisynth_c.dll should not be needed. However a .lib file will be needed to compile plugins since, unlike with the VC++ API, plugins need to use several symbols from avisynth_c.dll.
I hope I am making sence to you.
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Old 5th August 2003, 15:23   #5  |  Link
sh0dan
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Not much

But I assume it would only be a lib for avisynth_c. Shouldn't be much of a problem. I'm committing my temp work now - I'll get back with binary, libraries, etc.

Edit: Do you have CVS access??
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Last edited by sh0dan; 5th August 2003 at 22:43.
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Old 6th August 2003, 13:10   #6  |  Link
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New CVS binary up, with C-plugin support.
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Old 6th August 2003, 16:34   #7  |  Link
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I didn't take time to explore this, but if it means C-only code can be used to generate plugins and/or other compilers than MS VC++ can be used without much hassle, then that's definetely a good thing, which should be put forward even further (once it's stable, I guess).
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Old 6th August 2003, 16:52   #8  |  Link
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Kurosu, that is exactly what it does. C only code, or C++ code other than VC++.
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Old 6th August 2003, 17:18   #9  |  Link
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For now I guess it can only be tested with the example plugin in the archive above.
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Old 6th August 2003, 17:22   #10  |  Link
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Great!

Though, I'm so much used to current Avisynth framework I would take an awful time to switch to another one (even for the better, be it 3.0 or C-code - arhg, and asm syntax would change if I use another compiler ). But not having to compile with VC++ is a big step forward into the direction of "free software".

Last edited by Kurosu; 6th August 2003 at 17:28.
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Old 12th August 2003, 23:24   #11  |  Link
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New Version Available

Version 0.11 is now available at http://kevin.atkinson.dhs.org/avisynth_c/.

Minor API Changes, Bug Fixes, and enhanced examples to work with YV12.
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Old 23rd August 2003, 02:21   #12  |  Link
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Version 0.12 is now available at http://kevin.atkinson.dhs.org/avisynth_c/ .

Added some missing function to the API.
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Old 24th August 2003, 21:59   #13  |  Link
Si
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SimpleCSample?

Kevin,

I was wondering if you'd consider doing a LoadCPlugin conversion of SimpleSample (just a conversion of SimpleSample13a would do )

I believe your plugin could entice more people (hopefully with good ideas) into writing Avisynth filters.

regards

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Old 24th August 2003, 22:10   #14  |  Link
kevina
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I guess I could. I do provide some examples however.

If someone else cares to test out my API they could attempt to convert it. Would also give me some feedback on my design.....
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Old 25th August 2003, 02:21   #15  |  Link
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what about speed, do the same plugin done with vcc/icl and Cplugin have the same speed ?
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Old 25th August 2003, 02:55   #16  |  Link
kevina
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There is a little bit of overhead due to a extra function call for each API method used. However, since data is retrived on a per-frame bases
the overhead should be negligible.
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Old 25th August 2003, 04:10   #17  |  Link
stickboy
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Just to make sure your stance on the GPL is clear: must any plug-in that uses the Avisynth C API also be GPL'd?
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Old 25th August 2003, 04:59   #18  |  Link
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It is under the same copyright of Avisynth itself. So filters must not be GPL. I will try update the copyright for the next version.
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Old 25th August 2003, 15:32   #19  |  Link
Si
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@stickboy
Can I ask why you raised the question?
@kevin
COuld you explain your answer
Quote:
So filters must not be GPL
(Have I missed something somewhere )

regards
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Old 25th August 2003, 15:37   #20  |  Link
kevina
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My mistake. Filters do not have to be GPL.
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