Re: [sdljava-users] SDLVideoTest fails on FC4

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

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 isn't=20
>>> too difficult.  I would offer to add it, but I don't have a clue as=20
>>> 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 just=20
>>>> a few method calls or much more involved? I think I remember it=20
>>>> 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=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=92t=
.=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 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 includ=
ed in
> * all copies or substantial portions of the Software.
> *
> * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRE=
SS OR
> * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILI=
TY,
> * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHA=
LL
> * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR =
OTHER
> * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISI=
NG FROM,
> * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALING=
S IN
> * THE SOFTWARE.
> */
>
>/*
> * The above is included per the fill_yuv_image() function I borrowed fr=
om 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 heigh=
t)
>{
>    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
>