Re: [sdljava-users] SDLVideoTest fails on FC4

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

Hi Shane,

Had a glance at the code.  From what I see it should be no problem to=20
get the YUV stuff implemented.  I'll try to get it soon.  Most likely I=20
will work on it next weekend...

Cheers,
-Ivan/

Ivan Z. Ganza wrote:

> Great thanks,
>
> I will have a look at this and get back to you.
>
> Much appreciated,
> -Ivan/
>
> Shane M. Walton wrote:
>
>> Ivan,
>>
>> Here you go.  Just press the "q" key to quit the example.
>>
>> Shane
>>
>> Ivan Z. Ganza wrote:
>>
>>> 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=20
>>> tests the YUV I could then implement enough so those calls can be=20
>>> made on the sdljava side.  Once I can see how the code needs to be=20
>>> utilized  I can have some idea if it can be done easily...
>>>
>>> Thanks,
>>> -Ivan/
>>>
>>> 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=20
>>>> the Linux world.  All in all, what you get is the video on the=20
>>>> screen with little or no CPU overhead.  The overlay architecture=20
>>>> also typically have scaling capabilities, which look much softer=20
>>>> than any software routine.
>>>>
>>>> I think it would be very worthwhile to have SDL_Overlay(s)=20
>>>> implemented in sdljava, as Java in general really seems to be=20
>>>> missing efficient 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=20
>>>> isn't too difficult.  I would offer to add it, but I don't have a=20
>>>> clue as to 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=20
>>>>> stopped working. Should hit myself for not regression testing. I=20
>>>>> will try to 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=20
>>>>> just a few method calls or much more involved? I think I remember=20
>>>>> it wasn't easy to map (via swig) initially so that is why I=20
>>>>> 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=20
>>>>>> power 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=20
>>>>>> I don=92t feel all warm and fuzzy if the test application doesn=92=
t.=20
>>>>>> Has 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=20
>>>>>> 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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>>>
>>>
>>>
>>>
>>>
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>>
>> ----------------------------------------------------------------------=
--
>>
>> /*
>> * Libavformat API example: Output a media file in any supported
>> * libavformat format. The default codecs are used.
>> *
>> * Copyright (c) 2003 Fabrice Bellard
>> *
>> * Permission is hereby granted, free of charge, to any person=20
>> obtaining a copy
>> * of this software and associated documentation files (the=20
>> "Software"), to deal
>> * in the Software without restriction, including without limitation=20
>> the rights
>> * to use, copy, modify, merge, publish, distribute, sublicense,=20
>> and/or sell
>> * copies of the Software, and to permit persons to whom the Software i=
s
>> * furnished to do so, subject to the following conditions:
>> *
>> * The above copyright notice and this permission notice shall be=20
>> included in
>> * all copies or substantial portions of the Software.
>> *
>> * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,=20
>> EXPRESS OR
>> * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF=20
>> MERCHANTABILITY,
>> * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT=20
>> SHALL
>> * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES=20
>> OR OTHER
>> * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,=20
>> ARISING FROM,
>> * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER=20
>> DEALINGS IN
>> * THE SOFTWARE.
>> */
>>
>> /*
>> * The above is included per the fill_yuv_image() function I borrowed=20
>> from the
>> * FFmpeg output_example.c.  It is a cool little YUV generator...
>> *
>> */
>>
>> #include <stdio.h>  // for fprintf
>> #include <unistd.h> // for usleep
>>
>> #include <SDL/SDL.h>
>>
>> typedef struct {
>>   unsigned char *data[4] ;
>>   int linesize[4] ;
>> } myImage ;
>>
>> void fill_yuv_image(myImage *pict, int frame_index, int width, int=20
>> height)
>> {
>>    int x, y, i;
>>
>>    i =3D frame_index;
>>
>>    /* Y */
>>    for(y=3D0;y<height;y++) {
>>        for(x=3D0;x<width;x++) {
>>            pict->data[0][y * pict->linesize[0] + x] =3D x + y + i * 3;
>>        }
>>    }
>>
>>    /* Cb and Cr or U and V */
>>    for(y=3D0;y<height/2;y++) {
>>        for(x=3D0;x<width/2;x++) {
>>            pict->data[1][y * pict->linesize[1] + x] =3D 128 + y + i * =
2;
>>            pict->data[2][y * pict->linesize[2] + x] =3D 64 + x + i * 5=
;
>>        }
>>    }
>> }
>>
>> int main ( int argc, char *argv[] )
>> {
>>   int flags, cnt =3D 0, looping =3D 1, w =3D 640, h =3D 480 ;
>>   SDL_Surface *surface ;
>>   SDL_Overlay *overlay ;
>>   SDL_Rect area ;
>>   SDL_Event event ;
>>   myImage image ;
>>
>>   SDL_Init ( SDL_INIT_VIDEO ) ;
>>
>>   flags =3D SDL_HWSURFACE | SDL_ASYNCBLIT | SDL_HWACCEL ;
>>   if ( ( surface =3D SDL_SetVideoMode ( w, h, 0, flags ) ) =3D=3D NULL=
 )
>>   {
>>      fprintf ( stderr, "SDL_SetVideoMode: %s\n", SDL_GetError() ) ;
>>      return -1 ;
>>   }
>>
>>   /*
>>    * request a YVU420P overlay - Y + V + U
>>    */
>>   overlay =3D SDL_CreateYUVOverlay ( w, h, SDL_YV12_OVERLAY, surface )=
 ;
>>   if ( overlay =3D=3D NULL )
>>   {
>>      fprintf ( stderr, "SDL_CreateYUVOverlay: %s\n", SDL_GetError() ) =
;
>>      goto cleanup ;
>>   }
>>
>>   area.x =3D 0 ;
>>   area.y =3D 0 ;
>>   area.w =3D w ;
>>   area.h =3D h ;
>>
>>   while ( looping )
>>   {
>>      /*
>>       * lock the YUV overlay surface before messing with the pixels
>>       */
>>      SDL_LockYUVOverlay ( overlay ) ;
>>
>>      /*
>>       * swap the U and V planes since...
>>       * the overlay is YVU420P and the image YUV420P
>>       */
>>      image.data[0] =3D overlay->pixels[0] ;
>>      image.data[1] =3D overlay->pixels[2] ;
>>      image.data[2] =3D overlay->pixels[1] ;
>>      image.linesize[0] =3D overlay->pitches[0] ;
>>      image.linesize[1] =3D overlay->pitches[2] ;
>>      image.linesize[2] =3D overlay->pitches[1] ;
>>
>>      /*
>>       * copy in a YUV image
>>       */
>>      fill_yuv_image ( &image, cnt++, w, h ) ;
>>
>>      /*
>>       * unlock the YUV overlay surface after messing with the pixels
>>       */
>>      SDL_UnlockYUVOverlay ( overlay ) ;
>>
>>      /*
>>       * finally, display the YUV image
>>       */
>>      SDL_DisplayYUVOverlay ( overlay, &area ) ;
>>
>>      /*
>>       * check to see if the "q" key was pressed to quit
>>       */
>>      if ( SDL_PollEvent ( &event ) )
>>      {
>>         if ( event.type =3D=3D SDL_KEYDOWN )
>>         {
>>            switch ( event.key.keysym.sym )
>>            {
>>               case SDLK_q:
>>                  looping =3D 0 ;
>>                  break ;
>>            }
>>         }
>>      }
>>
>>      /*
>>       * sleep for a bit to avoid over-driving the CPU
>>       */
>>      usleep ( 20000 ) ;
>>   }
>>
>>   SDL_FreeYUVOverlay ( overlay ) ;
>>
>>   cleanup:
>>
>>   SDL_Quit ( ) ;
>>
>>   return 0 ;
>> }
>> =20
>>
>
>
>
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> language
> that extends applications into web and mobile media. Attend the live=20
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> and join the prime developer group breaking into this new coding=20
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