Re: [sdljava-users] SDLVideoTest fails on FC4

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Ivan,

That is great news.  I look forward to testing out the performance in 
Java.  Thanks!

Shane

Ivan Z. Ganza wrote:
> Hi Shane,
>
> Had a glance at the code.  From what I see it should be no problem to 
> get the YUV stuff implemented.  I'll try to get it soon.  Most likely 
> I 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 could give me a C program I can compile and run against sdl 
>>>> that tests the YUV I could then implement enough so those calls can 
>>>> be made on the sdljava side.  Once I can see how the code needs to 
>>>> be 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 
>>>>> which is more efficient to operate on than RGB.  So DVD/MPEG2 
>>>>> rendering applications usually take advantage of the YUV overlay 
>>>>> acceleration capabilities of a video card.  This is known as Xv in 
>>>>> the Linux world.  All in all, what you get is the video on the 
>>>>> screen with little or no CPU overhead.  The overlay architecture 
>>>>> also typically have scaling capabilities, which look much softer 
>>>>> than any software routine.
>>>>>
>>>>> I think it would be very worthwhile to have SDL_Overlay(s) 
>>>>> implemented in sdljava, as Java in general really seems to be 
>>>>> missing efficient video rendering capabilities.
>>>>>
>>>>> I can provide you with C/C++ source code examples if you are 
>>>>> interested in adding the SDL_Overlay functionality.  It really 
>>>>> isn't too difficult.  I would offer to add it, but I don't have a 
>>>>> 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 see the image either. Just a blank window. Not sure when 
>>>>>> this stopped working. Should hit myself for not regression 
>>>>>> testing. I will try to figure out the problem.
>>>>>>
>>>>>> Don't want to add more bad news but I never implemented the YUV 
>>>>>> Overlay stuff. Don't really know much about that aspect. Is it 
>>>>>> just a few method calls or much more involved? I think I remember 
>>>>>> it wasn't 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’t give me the 
>>>>>>> NullPointerException, but it doesn’t show the test_bmp.bmp aka 
>>>>>>> power plant.
>>>>>>>
>>>>>>> My ultimate goal is to create a Java video application that can 
>>>>>>> render video using the YUV Overlay. Maybe it would just work, 
>>>>>>> but I don’t feel all warm and fuzzy if the test application 
>>>>>>> doesn’t. Has anybody else had this issue?
>>>>>>>
>>>>>>> Shane
>>>>>>>
>>>>>>> ------------------------------------------------------------------------ 
>>>>>>>
>>>>>>>
>>>>>>> *From:* sdl...@li... 
>>>>>>> [mailto:sdl...@li...] *On Behalf Of 
>>>>>>> *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=./lib -cp ./classes/ 
>>>>>>> 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 
>>>>>>> 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 
>>> obtaining a copy
>>> * of this software and associated documentation files (the 
>>> "Software"), to deal
>>> * in the Software without restriction, including without limitation 
>>> the rights
>>> * to use, copy, modify, merge, publish, distribute, sublicense, 
>>> and/or sell
>>> * copies of the Software, and to permit persons to whom the Software is
>>> * furnished to do so, subject to the following conditions:
>>> *
>>> * The above copyright notice and this permission notice shall be 
>>> included in
>>> * all copies or substantial portions of the Software.
>>> *
>>> * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 
>>> EXPRESS OR
>>> * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 
>>> MERCHANTABILITY,
>>> * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT 
>>> SHALL
>>> * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES 
>>> OR OTHER
>>> * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, 
>>> ARISING FROM,
>>> * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER 
>>> DEALINGS IN
>>> * THE SOFTWARE.
>>> */
>>>
>>> /*
>>> * The above is included per the fill_yuv_image() function I borrowed 
>>> 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 
>>> height)
>>> {
>>>    int x, y, i;
>>>
>>>    i = frame_index;
>>>
>>>    /* Y */
>>>    for(y=0;y<height;y++) {
>>>        for(x=0;x<width;x++) {
>>>            pict->data[0][y * pict->linesize[0] + x] = x + y + i * 3;
>>>        }
>>>    }
>>>
>>>    /* Cb and Cr or U and V */
>>>    for(y=0;y<height/2;y++) {
>>>        for(x=0;x<width/2;x++) {
>>>            pict->data[1][y * pict->linesize[1] + x] = 128 + y + i * 2;
>>>            pict->data[2][y * pict->linesize[2] + x] = 64 + x + i * 5;
>>>        }
>>>    }
>>> }
>>>
>>> int main ( int argc, char *argv[] )
>>> {
>>>   int flags, cnt = 0, looping = 1, w = 640, h = 480 ;
>>>   SDL_Surface *surface ;
>>>   SDL_Overlay *overlay ;
>>>   SDL_Rect area ;
>>>   SDL_Event event ;
>>>   myImage image ;
>>>
>>>   SDL_Init ( SDL_INIT_VIDEO ) ;
>>>
>>>   flags = SDL_HWSURFACE | SDL_ASYNCBLIT | SDL_HWACCEL ;
>>>   if ( ( surface = SDL_SetVideoMode ( w, h, 0, flags ) ) == NULL )
>>>   {
>>>      fprintf ( stderr, "SDL_SetVideoMode: %s\n", SDL_GetError() ) ;
>>>      return -1 ;
>>>   }
>>>
>>>   /*
>>>    * request a YVU420P overlay - Y + V + U
>>>    */
>>>   overlay = SDL_CreateYUVOverlay ( w, h, SDL_YV12_OVERLAY, surface ) ;
>>>   if ( overlay == NULL )
>>>   {
>>>      fprintf ( stderr, "SDL_CreateYUVOverlay: %s\n", SDL_GetError() ) ;
>>>      goto cleanup ;
>>>   }
>>>
>>>   area.x = 0 ;
>>>   area.y = 0 ;
>>>   area.w = w ;
>>>   area.h = 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] = overlay->pixels[0] ;
>>>      image.data[1] = overlay->pixels[2] ;
>>>      image.data[2] = overlay->pixels[1] ;
>>>      image.linesize[0] = overlay->pitches[0] ;
>>>      image.linesize[1] = overlay->pitches[2] ;
>>>      image.linesize[2] = 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 == SDL_KEYDOWN )
>>>         {
>>>            switch ( event.key.keysym.sym )
>>>            {
>>>               case SDLK_q:
>>>                  looping = 0 ;
>>>                  break ;
>>>            }
>>>         }
>>>      }
>>>
>>>      /*
>>>       * sleep for a bit to avoid over-driving the CPU
>>>       */
>>>      usleep ( 20000 ) ;
>>>   }
>>>
>>>   SDL_FreeYUVOverlay ( overlay ) ;
>>>
>>>   cleanup:
>>>
>>>   SDL_Quit ( ) ;
>>>
>>>   return 0 ;
>>> }
>>>  
>>>
>>
>>
>>
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>
>
>
>
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> and join the prime developer group breaking into this new coding 
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