[SDL] To display raw image data !

[V.Rajashekar]

Hi,
I am new to SDL, I am using SDL_CreateRGBSurfaceFrom to display raw
image ( each pixel is in the format unsigned char ) captured by the
Camera connected to my PC. When I run this, I only get a black screen.
If I load a bmp image using SDL_LoadBMP, I get the image displayed
correctly. Any help in this regard, would be highly appreciated.
And suppose if I would like to extend this from static image to video,
how do I go about ?
Thanks,
Raj
 
This is the code that I am using !
 
 
        /* Initialize SDL */
        if ( SDL_Init(SDL_INIT_VIDEO) < 0 ) {
                ComplainAndExit();
        }
        atexit(SDL_Quit);
 
      imagebmp =
SDL_CreateRGBSurfaceFrom(camera1.m_pData,640,480,8,640,0,0,0,0);
 
        if ( imagebmp == NULL ) {
                ComplainAndExit();
        }
 
        /* Set the video mode (640x480 at native depth) */
        screen = SDL_SetVideoMode(640, 480, 0,
SDL_HWSURFACE|SDL_FULLSCREEN);
        if ( screen == NULL ) {
                ComplainAndExit();
        }
 
        /* Set the video colormap */
        if ( imagebmp->format->palette != NULL ) {
                SDL_SetColors(screen,
                                imagebmp->format->palette->colors, 0,
                                imagebmp->format->palette->ncolors);
        }
 
        /* Convert the image to the video format (maps colors) */
        image = SDL_DisplayFormat(imagebmp);
        SDL_FreeSurface(imagebmp);
        if ( image == NULL ) {
                ComplainAndExit();
        }
 
        /* Draw bands of color on the raw surface */
        if ( SDL_MUSTLOCK(screen) ) {
                if ( SDL_LockSurface(screen) < 0 )
                        ComplainAndExit();
        }
 

  /*
        buffer=(Uint8 *)screen->pixels;
        for ( i=0; i<screen->h; ++i ) {
                memset(buffer,(i*255)/screen->h,
                        screen->w*screen->format->BytesPerPixel);
                buffer += screen->pitch;
        }
   */
        if ( SDL_MUSTLOCK(screen) ) {
                SDL_UnlockSurface(screen);
        }
 
 
 
        /* Blit the image to the center of the screen */
        dstrect.x = (screen->w-image->w)/2;
        dstrect.y = (screen->h-image->h)/2;
        dstrect.w = image->w;
        dstrect.h = image->h;
        if ( SDL_BlitSurface(image, NULL, screen, &dstrect) < 0 ) {
                SDL_FreeSurface(image);
                ComplainAndExit();
        }
        SDL_FreeSurface(image);
 
        /* Update the screen */
        SDL_UpdateRects(screen, 1, &dstrect);
 
        SDL_Delay(5000);        /* Wait 5 seconds */
        exit(0);
}
 
 
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