sdl_phyuv.c

MPEG-4编解码的实现(包括MPEG4视音频编解码)

				overlay->hwdata->props.format =  Pg_VIDEO_FORMAT_YVYU;
				xv_port = 1; //supported
				Priority[i-1] = 100; //force selected
				
			}
		
		}
		else if(overlay->hwdata->caps.format  == Pg_VIDEO_FORMAT_V422)
		{
			
			Priority[i-1] = 5;
			Type[i-1] = Pg_VIDEO_FORMAT_V422;			
		}		
		else if(overlay->hwdata->caps.format  == Pg_VIDEO_FORMAT_CLJR)
		{
			
			Priority[i-1] = 6;
			Type[i-1] = Pg_VIDEO_FORMAT_CLJR;		
		}	
		else
		{
		
		Priority[i-1] = 0;
		}
			
overlay->hwdata->caps.size = sizeof(overlay->hwdata->caps);
}

	if ( xv_port == -1 )
	{
		SDL_SetError("No available video ports for requested format");
		return(NULL);
	}
 
//Pick the highest priority format
entries = i -2;
highest = Priority[0]; //make first entry top at begining
select = 0;

for (i = 1; i < entries; i++)
{


   if(Priority[i] > highest)
   {
      highest = Priority[i];
      select  = i;
   }
} 

 
 
 overlay->hwdata->caps.size = sizeof (overlay->hwdata->caps	);
PgGetScalerCapabilities(overlay->hwdata->channel, select, &(overlay->hwdata->caps));
overlay->hwdata->props.format = overlay->hwdata->caps.format ;

    overlay->hwdata->format = overlay->hwdata->props.format;  //to make easier for apps to use


	overlay->hwdata->props.size = sizeof (overlay->hwdata->props);
    overlay->hwdata->props.src_dim.w = width;   
    overlay->hwdata->props.src_dim.h = height;   
	
	overlay->hwdata->chromakey = PgGetOverlayChromaColor();

	// Set chromakey in video widget so we can see overlay data
	/* I don't know where the container widget is!!!, I guess it is in hidden->window*/
	
	PtEnter(0);
	PtSetArg( &argt, Pt_ARG_FILL_COLOR, overlay->hwdata->chromakey, 0 );
	PtSetResources( window, 1, &argt ); 
	PtLeave(0);


	fflush( stderr );

	overlay->hwdata->props.viewport.ul.x = overlay->hwdata->CurrentWindow.x;
	overlay->hwdata->props.viewport.ul.y = overlay->hwdata->CurrentWindow.y;
	//Next line MIGHT have x and y reversed!!!!!!!!!!!!
	overlay->hwdata->props.viewport.lr.x = overlay->hwdata->CurrentWindow.x +overlay->hwdata->CurrentWindow.w;
	overlay->hwdata->props.viewport.lr.y = overlay->hwdata->CurrentWindow.y + overlay->hwdata->CurrentWindow.h;
		


	overlay->hwdata->props.flags =
	    ~Pg_SCALER_PROP_SCALER_ENABLE | Pg_SCALER_PROP_DOUBLE_BUFFER ;

	if (overlay->hwdata->chromakey) {
		overlay->hwdata->props.flags |= Pg_SCALER_PROP_CHROMA_ENABLE;
		overlay->hwdata->props.color_key = overlay->hwdata->chromakey;
		overlay->hwdata->props.color_key_mask = 0xffffff;
	} 
	else
	{
		overlay->hwdata->props.flags &= ~Pg_SCALER_PROP_CHROMA_ENABLE;
	}


	overlay->hwdata->scaler_on = FALSE;



 rtncode =    PgConfigScalerChannel(overlay->hwdata->channel, &(overlay->hwdata->props));	
	switch(rtncode)
	{
	case -1:
		SDL_SetError("PgConfigScalerChannel failed\n");
		SDL_FreeYUVOverlay(overlay);
		return(NULL);
   		break;
	case 1:
		grab_ptrs2(overlay->hwdata->channel, overlay->hwdata->FrameData0, overlay->hwdata->FrameData1);
		break;
	case 0:
	default:
   		break;
	}


	grab_ptrs2(overlay->hwdata->channel, overlay->hwdata->FrameData0, overlay->hwdata->FrameData1);

if(overlay->hwdata->channel->yplane1 != NULL)			
	overlay->hwdata->YStride = overlay->hwdata->channel->yplane1->pitch;
if(overlay->hwdata->channel->uplane1 != NULL)			
	overlay->hwdata->UStride = overlay->hwdata->channel->uplane1->pitch;
if(overlay->hwdata->channel->vplane1 != NULL)			
	overlay->hwdata->VStride = overlay->hwdata->channel->vplane1->pitch;


	overlay->hwdata->current = PgNextVideoFrame(overlay->hwdata->channel);



	if (overlay->hwdata->current == -1)
	{
		SDL_SetError("PgNextFrame failed, bailing out\n");
		SDL_FreeYUVOverlay(overlay);
		return(NULL);
	}
        
        //set current frame for double buffering
	if(overlay->hwdata->current == 0)
	{
		overlay->hwdata->CurrentFrameData = overlay->hwdata->FrameData0;
	}
	else
	{
		overlay->hwdata->CurrentFrameData = overlay->hwdata->FrameData1;
	}
    
	overlay->hwdata->State = OVERLAY_STATE_ACTIVE;


	/* We're all done.. */
	return(overlay);
}

int ph_LockYUVOverlay(_THIS, SDL_Overlay *overlay)
{
//int rtncode;

if(overlay == NULL)
   return 0;

//set current frame for double buffering
	if(overlay->hwdata->current == 0)
	{
		overlay->hwdata->CurrentFrameData = overlay->hwdata->FrameData0;
	}
	else
	{
		overlay->hwdata->CurrentFrameData = overlay->hwdata->FrameData1;
	}

	//Lock gets the pointer and passes it to the app. The app writes all yuv data into overlay->pixels
//Note this is defined as Uint8 **pixels;				/* Read-write */	
	overlay->pixels = &overlay->hwdata->CurrentFrameData->Y; 
	overlay->pitches  = &overlay->hwdata->YStride;
		
	return(0);
}

void ph_UnlockYUVOverlay(_THIS, SDL_Overlay *overlay)
{
int rtncode;

if(overlay == NULL)
   return ;

		if(overlay->hwdata->scaler_on == FALSE) 
		{
			
		
		overlay->hwdata->props.flags |= Pg_SCALER_PROP_SCALER_ENABLE;
        rtncode =PgConfigScalerChannel(overlay->hwdata->channel, &(overlay->hwdata->props));
        	switch(rtncode)
			{
				case -1:
					SDL_SetError("PgConfigScalerChannel failed\n");
					SDL_FreeYUVOverlay(overlay);
   					break;
				case 1:
					grab_ptrs2(overlay->hwdata->channel, overlay->hwdata->FrameData0, overlay->hwdata->FrameData1);
					overlay->hwdata->scaler_on = TRUE;
					break;
				case 0:
					default:
					overlay->hwdata->scaler_on = TRUE;
   					break;
			}
//This would be the best place to draw chromakey but we do not have a SDL_Surface in the args
//This means we might see a chromakey flicker at startup
		}
		overlay->hwdata->current = PgNextVideoFrame(overlay->hwdata->channel);


	if (overlay->hwdata->current == -1) {
		SDL_SetError("PgNextVideoFrame failed\n");
		SDL_FreeYUVOverlay(overlay);	
		return;	
	}

	overlay->pixels = NULL;
}

int ph_DisplayYUVOverlay(_THIS, SDL_Overlay *overlay, SDL_Rect *dstrect)
{
int rtncode;

if(overlay == NULL)
   return 0;


	/*SDL_Rect CurrentWindow*/
//If CurrentWindow has change, move the viewport
if((overlay->hwdata->CurrentWindow.x != dstrect->x) ||
  (overlay->hwdata->CurrentWindow.y != dstrect->y) ||
  (overlay->hwdata->CurrentWindow.w != dstrect->w) ||
  (overlay->hwdata->CurrentWindow.h != dstrect->h))
{
		if(overlay->hwdata->State == OVERLAY_STATE_UNINIT)
		return -1;

	overlay->hwdata->CurrentWindow.x = dstrect->x;
  	overlay->hwdata->CurrentWindow.y = dstrect->y;
  	overlay->hwdata->CurrentWindow.w = dstrect->w;
  	overlay->hwdata->CurrentWindow.h = dstrect->h;

	overlay->hwdata->props.viewport.ul.x = overlay->hwdata->CurrentWindow.x;
	overlay->hwdata->props.viewport.ul.y = overlay->hwdata->CurrentWindow.y;
	//Next line MIGHT have x and y reversed!!!!!!!!!!!!
	overlay->hwdata->props.viewport.lr.x = overlay->hwdata->CurrentWindow.x +overlay->hwdata->CurrentWindow.w;
	overlay->hwdata->props.viewport.lr.y = overlay->hwdata->CurrentWindow.y + overlay->hwdata->CurrentWindow.h;

	
     rtncode = PgConfigScalerChannel(overlay->hwdata->channel, &(overlay->hwdata->props));

	switch(rtncode)
	{
	case -1:
		SDL_SetError("PgConfigScalerChannel failed\n");
		SDL_FreeYUVOverlay(overlay);
		return(0);
   		break;
	case 1:
		grab_ptrs2(overlay->hwdata->channel, overlay->hwdata->FrameData0, overlay->hwdata->FrameData1);
		break;
	case 0:
	default:
   		break;
	}
}


//JB the X11 file did this. We do this in SDL_unlock, we need to confirm that lock and unlock are called for each frame!
//	XvShmPutImage(GFX_Display, hwdata->port, SDL_Window, SDL_GC,
//	              hwdata->image, 0, 0, overlay->w, overlay->h,
//	              dstrect->x, dstrect->y, dstrect->w, dstrect->h, False);	           
/*  This is what this call is
int XvShmPutImage (
   Display *dpy,
   XvPortID port,
   Drawable d,
   GC gc,
   XvImage *image,
   int src_x,
   int src_y,
   unsigned int src_w,
   unsigned int src_h,
   int dest_x, 
   int dest_y,
   unsigned int dest_w,
   unsigned int dest_h,
   Bool send_event
)
*/

	return(0);
}

void ph_FreeYUVOverlay(_THIS, SDL_Overlay *overlay)
{
	//struct private_yuvhwdata *hwdata;

	if(overlay == NULL)
		return;
	
	if(overlay->hwdata == NULL)
		return;
	
	overlay->hwdata->State = OVERLAY_STATE_UNINIT;

	if( overlay->hwdata->channel == NULL )
	{
		return;
	}	

	PgDestroyVideoChannel(overlay->hwdata->channel);

	overlay->hwdata->channel = NULL;
	overlay->hwdata->CurrentFrameData = NULL;  
	
	free(overlay->hwdata->FrameData0);
	free(overlay->hwdata->FrameData1);
	overlay->hwdata->FrameData0 = NULL;
	overlay->hwdata->FrameData1 = NULL;
	free(overlay->hwdata);

}