dr_55.c

ts流的解复用

/*****************************************************************************
 * dr_55.c
 * (c)2004 VideoLAN
 * $Id: dr_55.c 89 2004-06-28 19:17:23Z gbazin $
 *
 * Authors: Christophe Massiot <[e-mail]>
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 *
 *****************************************************************************/


#include "config.h"

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#if defined(HAVE_INTTYPES_H)
#include <inttypes.h>
#elif defined(HAVE_STDINT_H)
#include <stdint.h>
#endif

#include "../dvbpsi.h"
#include "../dvbpsi_private.h"
#include "../descriptor.h"

#include "dr_55.h"


/*****************************************************************************
 * dvbpsi_DecodeParentalRatingDr
 *****************************************************************************/
dvbpsi_parental_rating_dr_t * dvbpsi_DecodeParentalRatingDr(
                                        dvbpsi_descriptor_t * p_descriptor)
{
  int i_ratings_number, i;      
  dvbpsi_parental_rating_dr_t * p_decoded;

  /* Check the tag */
  if(p_descriptor->i_tag != 0x55)
  {
    DVBPSI_ERROR_ARG("dr_55 decoder", "bad tag (0x%x)", p_descriptor->i_tag);
    return NULL;
  }

  /* Don't decode twice */
  if(p_descriptor->p_decoded)
    return p_descriptor->p_decoded;

  /* Allocate memory */
  p_decoded =
        (dvbpsi_parental_rating_dr_t*)malloc(sizeof(dvbpsi_parental_rating_dr_t));
  if(!p_decoded)
  {
    DVBPSI_ERROR("dr_55 decoder", "out of memory");
    return NULL;
  }

  /* Decode data and check the length */
  if(p_descriptor->i_length % 4)
  {
    DVBPSI_ERROR_ARG("dr_55 decoder", "length not multiple of 4 (%d)",
                     p_descriptor->i_length);
    free(p_decoded);
    return NULL;
  }
  
  i_ratings_number = p_descriptor->i_length / 4;

  p_decoded->i_ratings_number = i_ratings_number;
  
  for (i=0; i < i_ratings_number; i++)
  {
    p_decoded->p_parental_rating[i].i_country_code = 
                   ((uint32_t)p_descriptor->p_data[4 * i] << 16)
                      | ((uint32_t)p_descriptor->p_data[4 * i + 1] << 8)
                      | p_descriptor->p_data[4 * i + 2];
    
    p_decoded->p_parental_rating[i].i_rating = p_descriptor->p_data[4 * i + 3];
  }
  
  p_descriptor->p_decoded = (void*)p_decoded;

  return p_decoded;
}


/*****************************************************************************
 * dvbpsi_GenParentalRatingDr
 *****************************************************************************/
dvbpsi_descriptor_t * dvbpsi_GenParentalRatingDr(
                                        dvbpsi_parental_rating_dr_t * p_decoded,
                                        int b_duplicate)
{
  int i;
  
  /* Create the descriptor */
  dvbpsi_descriptor_t * p_descriptor =
      dvbpsi_NewDescriptor(0x55, p_decoded->i_ratings_number * 4 , NULL);
  
  if(p_descriptor)
  {
    /* Encode data */
    for (i=0; i < p_decoded->i_ratings_number; i++ )
    {     
      p_descriptor->p_data[8 * i] = 
               p_decoded->p_parental_rating[i].i_country_code >> 16;
      p_descriptor->p_data[8 * i + 1] = 
               (p_decoded->p_parental_rating[i].i_country_code >> 8) & 0xff;
      p_descriptor->p_data[8 * i + 2] = 
               p_decoded->p_parental_rating[i].i_country_code & 0xff;

      p_descriptor->p_data[8 * i + 3] = 
               p_decoded->p_parental_rating[i].i_rating;
    }
    
    if(b_duplicate)
    {
      /* Duplicate decoded data */
      dvbpsi_parental_rating_dr_t * p_dup_decoded =
        (dvbpsi_parental_rating_dr_t*)malloc(sizeof(dvbpsi_parental_rating_dr_t));
      if(p_dup_decoded)
        memcpy(p_dup_decoded, p_decoded, sizeof(dvbpsi_parental_rating_dr_t));
  
      p_descriptor->p_decoded = (void*)p_dup_decoded;
    }
  }

  return p_descriptor;
}