asn1_createScene.c

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/*******************************************************************************
 * Copyright © 2014 The DTVKit Open Software Foundation Ltd (www.dtvkit.org)
 * Copyright © 2004 Ocean Blue Software Ltd
 * Copyright © 2000 Koninklijke Philips Electronics N.V
 *
 * This file is part of a DTVKit Software Component
 * You are permitted to copy, modify or distribute this file subject to the terms
 * of the DTVKit 1.0 Licence which can be found in licence.txt or at www.dtvkit.org
 *
 * THIS CODE AND INFORMATION ARE PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND,
 * EITHER EXPRESSED OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND/OR FITNESS FOR A PARTICULAR PURPOSE.
 *
 * If you or your organisation is not a member of DTVKit then you have access
 * to this source code outside of the terms of the licence agreement
 * and you are expected to delete this and any associated files immediately.
 * Further information on DTVKit, membership and terms can be found at www.dtvkit.org
 *******************************************************************************/
/*---includes for this file--------------------------------------------------*/
#include <stdio.h>
#include "vpa1_sys.h"
#include "vpa1_tgs.h"
#include "fpa1_syn.h"
#include "asn1_sys.h"

#include "mh5base.h"
#include "mh5scene.h"
#include "asn1_createExtras.h"
#include "asn1_createAction.h"
#include "asn1_createGroup.h"
#include "asn1_createApplication.h"
#include "asn1_createScene.h"

/*******************
 * LOCAL MACROS     *
 ********************/

/*******************
 * EXPORTED DATA    *
 ********************/

/*******************
 * LOCAL TYPEDEFS   *
 ********************/

/*******************
 * STATIC DATA      *
 ********************/

/**********************
 * FUNCTION PROTOTYPES *
 ***********************/


/*******************************************************************************
 *@begin
 * NAME: asn1_decodeScene
 *       decodes Scene class.
 *       Refer to MHEG5 Specification (ISO/IEC 13522-2:1996), Appendix A,
 *       section [A.3] for details of ASN.1 representation.
 *
 * Returns : asnErr
 *
 * Parameter     Flow    Description
 * ------------------------------------------------------------------------------
 * *listPtr      in      pointer to current fpa1_syntaxList item
 * *scene        in/out  Pointer to scene class being decoded.
 *
 * Externals     Flow    Usage
 * ------------------------------------------------------------------------------
 *
 * Additional information:
 *
 *@end
 *******************************************************************************/
asnErr asn1_decodeScene(fpa1_syntaxList *listPtr, MHEG5Scene *scene)
{
   asnErr errVal = 0;
   fpa1_syntaxList *currItem;

   DPL5((">> asn1_decodeScene(%X,%X)\n", listPtr, scene));

   assert(scene);
   if (listPtr == NULL)
   {
      DPL5(("<< asn1_decodeScene() Returned early\n"));
      return 1;
   }

   currItem = listPtr->children;

   /* defaults: */
   scene->aspectRatio = ASPECT_UNDEFINED;
   scene->movingCursor = MHEG5FALSE;

   /* Set asn1_mainObject to the current scene. */
   asn1_mainGroupPtr = (MHEG5Group *)scene;
   asn1_GroupActionCount = 0;
   asn1_GroupParamCount = 0;

   /* searches current set of tags for local tags */
   while (currItem != NULL)
   {
      switch (currItem->tag)
      {
         case INEVENT:
            scene->inputEventRegister = currItem->data.intData;
            break;
         case SCENECOORDS:
            if ((currItem->children != NULL) && (currItem->children->next != NULL))
            {
               scene->sceneCoordinateSystem[0] = currItem->children->data.intData;
               scene->sceneCoordinateSystem[1] = currItem->children->next->data.intData;
            }
            break;
         case ASPECT:
            if ((currItem->children != NULL) && (currItem->children->next != NULL))
            {
               if (currItem->children->data.intData == 0 && currItem->children->next->data.intData == 0)
               {
                  scene->aspectRatio = ASPECT_UNDEFINED;
               }
               else if (currItem->children->data.intData == 4 && currItem->children->next->data.intData == 3)
               {
                  scene->aspectRatio = ASPECT_RATIO_4_3;
               }
               else if (currItem->children->data.intData == 16 && currItem->children->next->data.intData == 9)
               {
                  scene->aspectRatio = ASPECT_RATIO_16_9;
               }
               else
               {
                  DPL1(("asn1_decodeScene - ERROR: Invalid aspect ratio\n"));
               }
            }
            break;
#ifndef ASN1UKPROFILE
         case MOVING: /* Not in UK1 profile */
            scene->movingCursor = (currItem->data.boolData == 0) ? MHEG5FALSE : MHEG5TRUE;
            break;
#endif /* ASN1UKPROFILE */
         case NEXTSCN:
            /* If this fails, we carry on anyway leaving nextScenes NULL */
            asn1_decodeNextScenes(currItem->children, &scene->nextScenes);
            break;
         case OINPUTMASK:
            errVal |= asn1_decodeOctetString(currItem, &scene->inputMask);
            break;
         default:
            break;
      }
      currItem = currItem->next;
   }
   /* decode inherited tags */
   errVal |= asn1_decodeGroup(listPtr, &(scene->group));

#if (DPLEVEL >= 2)
   if (errVal != 0)
   {
      DPL2(("WARNING:[ASN.1] asn1_decodeScene() returns errVal = %d\n", errVal));
   }
#endif /* DPLEVEL >= 2 */

   DPL5(("<< asn1_decodeScene() Returns %d\n", errVal));

   return errVal;
}