sdl_dspvideo.c

MPEG-4编解码的实现(包括MPEG4视音频编解码)

	if ( (**device_list).gdNextGD == NULL ) {
	  *device = main_device;
	  return 0;
	}
		
	memset (&attrib, 0, sizeof (DSpContextAttributes));

	/* These attributes are hopefully supported on all devices...*/
	attrib.displayWidth         = 640;
	attrib.displayHeight        = 480;
	attrib.displayBestDepth     = 8;
	attrib.backBufferBestDepth  = 8;
	attrib.displayDepthMask     = kDSpDepthMask_All;
	attrib.backBufferDepthMask  = kDSpDepthMask_All;
	attrib.colorNeeds           = kDSpColorNeeds_Require;
	attrib.pageCount            = 1;
			 
	if (noErr != DMGetDisplayIDByGDevice (main_device, &display_id, SDL_FALSE)) {
		SDL_SetError ("Display Manager couldn't associate GDevice with a Display ID");
		return (-1);
	}
	
	/* Put up dialog on main display to select which display to use */
	if (noErr != DSpUserSelectContext (&attrib, display_id, NULL, &context)) {
		SDL_SetError ("DrawSprocket couldn't create a context");
		return (-1);
	}
         
	if (noErr != DSpContext_GetDisplayID (context, &display_id)) {
		SDL_SetError ("DrawSprocket couldn't get display ID");
		return (-1);
	}
  
	if (noErr != DMGetGDeviceByDisplayID  (display_id, &main_device, SDL_FALSE)) {
		SDL_SetError ("Display Manager couldn't associate Display ID with GDevice");
		return (-1);  
	}

	*device = main_device;
	return (0);
#endif
}

static int DSp_VideoInit(_THIS, SDL_PixelFormat *vformat)
{
	
	NumVersion dsp_version = DSpGetVersion ();
	
	if (  (dsp_version.majorRev == 1 && dsp_version.minorAndBugRev < 0x73) ||
	      (dsp_version.majorRev < 1)  ) {                          
	    
	   /* StandardAlert (kAlertStopAlert, "\pError!", 
	                "\pI need DrawSprocket 1.7.3 or later!\n"
	                  "You can find a newer version at http://www.apple.com/swupdates.",
	                   NULL, NULL);
	    */              
	    SDL_SetError ("DrawSprocket version is too old. Need 1.7.3 or later.");
	    return (-1);
	}
	
	if ( DSpStartup () != noErr ) {
		SDL_SetError ("DrawSprocket couldn't startup");
		return(-1);
	}
	
	/* Start DSpintosh events */
	Mac_InitEvents(this);

	/* Get a handle to the main monitor, or choose one on multiple monitor setups */
	if ( DSp_GetMainDevice(this, &SDL_Display) <  0)
		return (-1);

	/* Determine pixel format */
    vformat->BitsPerPixel = GetPixDepth ( (**SDL_Display).gdPMap );
	dsp_old_depth = vformat->BitsPerPixel;
		
	switch (vformat->BitsPerPixel) {
		case 16:	
			vformat->Rmask = 0x00007c00;
			vformat->Gmask = 0x000003e0;
			vformat->Bmask = 0x0000001f;
			break;
		default:
			break;
	}
   
   if ( DSp_CreatePalette (this) < 0 ) {
   
      SDL_SetError ("Could not create palette");
      return (-1);
   }
   
	/* Get a list of available fullscreen modes */
	SDL_modelist = DSp_BuildModeList (SDL_Display);
	if (SDL_modelist == NULL) {
		SDL_SetError ("DrawSprocket could not build a mode list");
		return (-1);
	}
	
	/* Check for VRAM and AGP GWorlds for HW Blitting */
	DSp_IsHWAvailable (this, vformat);
	
	this->info.wm_available = 0;

	if (dsp_vram_available || dsp_agp_available) {
    
	  this->info.hw_available = SDL_TRUE;
	  
	  this->CheckHWBlit  = DSp_CheckHWBlit;
	  this->info.blit_hw = SDL_TRUE; 
  
	  this->FillHWRect     = DSp_FillHWRect;
	  this->info.blit_fill = SDL_TRUE;
	  
	#ifdef DSP_TRY_CC_AND_AA  
	  this->SetHWColorKey   = DSp_SetHWColorKey;
	  this->info.blit_hw_CC = SDL_TRUE;
	  
	  this->SetHWAlpha      = DSp_SetHWAlpha;
	  this->info.blit_hw_A  = SDL_TRUE;
	#endif
	
	}  
    
	return(0);
}

static SDL_Rect **DSp_ListModes(_THIS, SDL_PixelFormat *format, Uint32 flags)
{
	static SDL_Rect *dsp_modes[16];
	int i = 0, j = 0;
	
	if ( format->BitsPerPixel == 0 )
	   return ( (SDL_Rect**) NULL );
	
	while (SDL_modelist[i] != NULL) {
	
	   if (SDL_modelist[i]->x & format->BitsPerPixel) {
	      dsp_modes[j] = SDL_modelist[i];
	      j++;
	   }
	   i++;
	}
	
	dsp_modes[j] = NULL;

	return dsp_modes;
}

/* Various screen update functions available */
static void DSp_DirectUpdate(_THIS, int numrects, SDL_Rect *rects);

static volatile unsigned int retrace_count = 0; /* -dw- need volatile because it updates asychronously */

#if ! TARGET_API_MAC_OSX
Boolean DSp_VBLProc ( DSpContextReference context, void *ref_con )
{
	retrace_count++;
	
	return 1; /* Darrell, is this right? */
}
#endif

static void DSp_SetHWError (OSStatus err, int is_agp)
{
	char message[1024];
	const char *fmt, *mem;

	if ( is_agp ) {
		mem = "AGP Memory";
	} else {
		mem = "VRAM";
	}
	switch(err) {
	    case memFullErr:
		fmt = "Hardware surface possible but not enough %s available";
		break;
	    case cDepthErr:
		fmt = "Hardware surface possible but invalid color depth";
		break;
	    default:
		fmt = "Hardware surface could not be allocated in %s - unknown error";
		break;
	}
	sprintf(message, fmt, mem);
	SDL_SetError(message);
}

/* put up a dialog to verify display change */
static int DSp_ConfirmSwitch () {

  /* resource id's for dialog */
  const int rDialog = 1002;
  const int bCancel = 1;
  const int bOK     = 2;
  
  DialogPtr dialog;
  OSStatus  err;
  SInt32    response;
  DialogItemIndex       item = 0;
  GrafPtr   savePort;
    
  GetPort (&savePort);
  
  dialog = GetNewDialog (rDialog, NULL, (WindowPtr) -1);
  if (dialog == NULL)
	 return (0);
  
  SetPort (dialog);
  
  SetDialogDefaultItem (dialog, bCancel);
  SetDialogCancelItem  (dialog, bCancel);
  
  SetEventMask (everyEvent);  
  FlushEvents (everyEvent, 0);
   
   /* On MacOS 8.5 or later, we can make the dialog go away after 15 seconds */
   /* This is good since it's possible user can't even see the dialog! */
   /* Requires linking to DialogsLib */
   err = Gestalt(gestaltSystemVersion,&response);
   if (err == noErr && response >= 0x00000850) {
   	SetDialogTimeout(dialog, bCancel, 15);
   }

   do {      
    
    ModalDialog ( NULL, &item );  

   } while ( item != bCancel && item != bOK && err != noErr);

  DisposeWindow (dialog);
  SetPort (savePort);
  
  SetEventMask(everyEvent - autoKeyMask);
  FlushEvents(everyEvent, 0);
   
  return (item - 1);
}

static void DSp_UnsetVideoMode(_THIS, SDL_Surface *current)
{
			
		
	 if ( current->flags & SDL_OPENGL )  { 
	   Mac_GL_Quit (this);	   	
	}
		
	if (dsp_context != NULL) {
		
		GWorldPtr front;
		DSpContext_GetFrontBuffer (dsp_context, &front);
		
		if (front != dsp_back_buffer)
		   DisposeGWorld (dsp_back_buffer);
		
		if (current->hwdata)
		   free (current->hwdata);
		   
		DSpContext_SetState (dsp_context, kDSpContextState_Inactive );
		DSpContext_Release  (dsp_context);
		
		dsp_context = NULL;
	}
    	
    if (SDL_Window != NULL) {
        DisposeWindow (SDL_Window);
        SDL_Window = NULL;
    }    
    
    current->pixels = NULL;
    current->flags  = 0;
}

static SDL_Surface *DSp_SetVideoMode(_THIS,
	SDL_Surface *current, int width, int height, int bpp, Uint32 flags)
{
	
	DisplayIDType        display_id;
	DSpContextAttributes attrib;
	Fixed freq;
	OSStatus err;
	UInt32 rmask = 0, gmask = 0, bmask = 0;
		
	int   page_count;
	int   double_buf;
	int   hw_surface;
	int   use_dsp_back_buffer;
     
	DSp_UnsetVideoMode (this, current);
       
    if (bpp != dsp_old_depth)
        DSp_DestroyPalette (this);
   
	double_buf = (flags & SDL_DOUBLEBUF) != 0;
	hw_surface = (flags & SDL_HWSURFACE) != 0;
	use_dsp_back_buffer = !dsp_vram_available || !hw_surface ;
	
	current->flags |= SDL_FULLSCREEN;

rebuild:  
  
	if ( double_buf && use_dsp_back_buffer ) {
		page_count = 2;
	} else {
		page_count = 1;
	}

	memset (&attrib, 0, sizeof (DSpContextAttributes));
	attrib.displayWidth         = width;
	attrib.displayHeight        = height;
	attrib.displayBestDepth     = bpp;
	attrib.backBufferBestDepth  = bpp;
	attrib.displayDepthMask     = kDSpDepthMask_All;
	attrib.backBufferDepthMask  = kDSpDepthMask_All;
	attrib.colorNeeds           = kDSpColorNeeds_Require;
	attrib.colorTable           = 0;
	attrib.pageCount            = page_count;
        #if TARGET_API_MAC_OSX
        
        if ( DSpFindBestContext (&attrib, &dsp_context) != noErr ) {
            SDL_SetError ("DrawSprocket couldn't find a context");
            return NULL;
        }
        
        #else
	if ( noErr != DMGetDisplayIDByGDevice (SDL_Display, &display_id, SDL_FALSE) ) {
		SDL_SetError ("Display Manager couldn't associate GDevice with display_id");
		return NULL;
	}	
	if ( DSpFindBestContextOnDisplayID (&attrib, &dsp_context, display_id) != noErr ) {
		SDL_SetError ("DrawSprocket couldn't find a suitable context on given display");
		return NULL;
	}
	
        #endif		
	if ( DSpContext_Reserve (dsp_context, &attrib) != noErr ) {
		SDL_SetError ("DrawSprocket couldn't get the needed resources to build the display");
		return NULL;
	}
	
	if ( (err = DSpContext_SetState (dsp_context, kDSpContextState_Active)) != noErr ) {
		
		if (err == kDSpConfirmSwitchWarning) {     
		  
		   if ( ! DSp_ConfirmSwitch () ) {
		   
		      DSpContext_Release (dsp_context);
		      dsp_context = NULL;
		      SDL_SetError ("User cancelled display switch");
		      return NULL;
		   }
		   else
		     /* Have to reactivate context. Why? */
		     DSpContext_SetState (dsp_context, kDSpContextState_Active);
		      
	   }
	   else {
	      SDL_SetError ("DrawSprocket couldn't activate the context");
		  return NULL;
	   }
	}
   
   
	if (bpp != dsp_old_depth) {
   	
   	    DSp_CreatePalette  (this);
   
       	/* update format if display depth changed */
       	if (bpp == 16) {
       	
       	   rmask = 0x00007c00;
       	   gmask = 0x000003e0;
       	   bmask = 0x0000001f;
       	}
       	if ( ! SDL_ReallocFormat (current, bpp, rmask, gmask, bmask, 0 ) ) {
       		
       	   SDL_SetError ("Could not reallocate video format.");
       	   return(NULL);
       	}
	}
	
	if (!double_buf) {
		
		/* single-buffer context */
		DSpContext_GetFrontBuffer (dsp_context, &dsp_back_buffer);
			
		current->hwdata   = (private_hwdata*) malloc (sizeof (private_hwdata));
		if (current ->hwdata == NULL) {
			SDL_OutOfMemory ();
	  		return NULL;		  
		}
		current->hwdata->offscreen = dsp_back_buffer;
	    current->flags   |= SDL_HWSURFACE;
	    this->UpdateRects = DSp_DirectUpdate;
	} 
	else if ( use_dsp_back_buffer ) {
	
		DSpContext_GetBackBuffer  (dsp_context, kDSpBufferKind_Normal, &dsp_back_buffer);
		
		current->flags   |= SDL_DOUBLEBUF | SDL_SWSURFACE; /* only front buffer is in VRAM */                                     
	    this->UpdateRects = DSp_DSpUpdate;	
	} 
	else if ( DSp_NewHWSurface(this, &dsp_back_buffer, bpp, width-1, height-1) == 0 ) {
      
      current->hwdata = (private_hwdata*) malloc (sizeof (private_hwdata));
      if (current ->hwdata == NULL) {
      	SDL_OutOfMemory ();
      	return NULL;		  
      }
      
      memset (current->hwdata, 0, sizeof (private_hwdata));
      current->hwdata->offscreen = dsp_back_buffer;
      current->flags |= SDL_DOUBLEBUF | SDL_HWSURFACE; 
      this->UpdateRects = DSp_DirectUpdate; /* hardware doesn't do update rects, must be page-flipped */	   
   }  	
   else {

	   DSpContext_Release (dsp_context);	
	   use_dsp_back_buffer = SDL_TRUE;
	   goto  rebuild;
    }
	   	
    current->pitch  = GetPortPixRowBytes(dsp_back_buffer) & 0x3FFF;
	current->pixels = GetPixBaseAddr(GetPortPixMap(dsp_back_buffer));
	
	current->w = width;
	current->h = height;
	
    #if ! TARGET_API_MAC_OSX
        
	if (use_dsp_back_buffer) {
	   
	   DSpContext_GetMonitorFrequency (dsp_context, &freq);
	   DSpContext_SetMaxFrameRate     (dsp_context, freq >> 16);
	}
	
    
	if ( (current->flags & SDL_HWSURFACE) || (current->flags & SDL_OPENGL) )
		DSpContext_SetVBLProc (dsp_context, DSp_VBLProc, NULL);
    #endif
	
	if (bpp == 8)	
	   current->flags |= SDL_HWPALETTE;
	
	if (flags & SDL_OPENGL) {
		   
	   Rect rect;
	   RGBColor rgb = { 0.0, 0.0, 0.0 };
	   GrafPtr save_port;
	   
	   SetRect (&rect, 0, 0, width, height);
	   SDL_Window = NewCWindow(nil, &( (**SDL_Display).gdRect), "\p", SDL_TRUE, plainDBox, (WindowPtr)-1, SDL_FALSE, 0);
		   
	   if (SDL_Window == NULL) {
		 
		   SDL_SetError ("DSp_SetVideoMode : OpenGL window could not be created.");
		   return NULL;  			   	
	   }
	   
	   /* Set window color to black to avoid white flash*/
	   GetPort (&save_port);
	   SetPort (SDL_Window);
	      RGBForeColor (&rgb);