Re: [sdljava-users] SDLVideoTest fails on FC4

[Ivan Z. G. <iva...@ya...>]

Greeting Shane,

Any example code you can provide in C++ would be helpful.  Or if you=20
could give me a C program I can compile and run against sdl that tests=20
the YUV I could then implement enough so those calls can be made on the=20
sdljava side.  Once I can see how the code needs to be utilized  I can=20
have some idea if it can be done easily...

Thanks,
-Ivan/
=20
Shane M. Walton wrote:

> Thanks Ivan.
>
> The SDL_Overlay is very powerful when one would like to render video.
>
> Typically MPEG codecs encode/decode pixels into a YUV color space=20
> which is more efficient to operate on than RGB.  So DVD/MPEG2=20
> rendering applications usually take advantage of the YUV overlay=20
> acceleration capabilities of a video card.  This is known as Xv in the=20
> Linux world.  All in all, what you get is the video on the screen with=20
> little or no CPU overhead.  The overlay architecture also typically=20
> have scaling capabilities, which look much softer than any software=20
> routine.
>
> I think it would be very worthwhile to have SDL_Overlay(s) implemented=20
> in sdljava, as Java in general really seems to be missing efficient=20
> video rendering capabilities.
>
> I can provide you with C/C++ source code examples if you are=20
> interested in adding the SDL_Overlay functionality.  It really isn't=20
> too difficult.  I would offer to add it, but I don't have a clue as to=20
> how SWIG works, but always willing to learn.
>
> Shane
>
> Ivan Z. Ganza wrote:
>
>> Greetings Shane,
>>
>> Sorry that your having trouble. I just tried it myself and I don't=20
>> see the image either. Just a blank window. Not sure when this stopped=20
>> working. Should hit myself for not regression testing. I will try to=20
>> figure out the problem.
>>
>> Don't want to add more bad news but I never implemented the YUV=20
>> Overlay stuff. Don't really know much about that aspect. Is it just a=20
>> few method calls or much more involved? I think I remember it wasn't=20
>> easy to map (via swig) initially so that is why I skipped it.
>>
>> testimage seems to be working fine though. hmm.
>>
>> -Ivan/
>>
>> Shane M. Walton wrote:
>>
>>> The current binary download for Linux i386 doesn=92t give me the=20
>>> NullPointerException, but it doesn=92t show the test_bmp.bmp aka powe=
r=20
>>> plant.
>>>
>>> My ultimate goal is to create a Java video application that can=20
>>> render video using the YUV Overlay. Maybe it would just work, but I=20
>>> don=92t feel all warm and fuzzy if the test application doesn=92t. Ha=
s=20
>>> anybody else had this issue?
>>>
>>> Shane
>>>
>>> ---------------------------------------------------------------------=
---=20
>>>
>>>
>>> *From:* sdl...@li...=20
>>> [mailto:sdl...@li...] *On Behalf Of=20
>>> *Shane M. Walton
>>> *Sent:* Friday, March 03, 2006 7:35 AM
>>> *To:* sdl...@li...
>>> *Subject:* [sdljava-users] SDLVideoTest fails on FC4
>>>
>>> OS: Fedora Core 4 (i686)
>>>
>>> SDL: 1.2.8-3.2
>>>
>>> JDK: Sun 1.5.0_06
>>>
>>> SWIG: 1.3.24-2
>>>
>>> The following happens with both stable release and cvs trunk checkout=
:
>>>
>>> java -Djava.library.path=3D./lib -cp ./classes/=20
>>> sdljava.video.SDLVideoTest
>>>
>>> Video subsystem initialized
>>>
>>> java.lang.NullPointerException
>>>
>>> at sdljava.video.SDLPixelFormat.getPalette(SDLPixelFormat.java:61)
>>>
>>> at sdljava.video.SDLPixelFormat.toString(SDLPixelFormat.java:375)
>>>
>>> at sdljava.video.SDLSurface.toString(SDLSurface.java:1122)
>>>
>>> at java.lang.String.valueOf(String.java:2577)
>>>
>>> at java.lang.StringBuffer.append(StringBuffer.java:220)
>>>
>>> at sdljava.video.SDLVideoTest.init(SDLVideoTest.java:21)
>>>
>>> at sdljava.video.SDLVideoTest.main(SDLVideoTest.java:70)
>>>
>>> Seems like all accessors in SDLPixelFormat throw a=20
>>> NullPointerException.
>>>
>>> Thanks.
>>>
>>> Shane
>>>
>>
>>
>>
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>
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