eit.c

Dvbstreamer 用在解析MPTS的部分内容

/*****************************************************************************
 * eit.c: EIT decoder/generator
 *----------------------------------------------------------------------------
 * (c)2004 VideoLAN
 * $Id: eit.c 88 2004-02-24 14:31:18Z sam $
 *
 * Authors: Christophe Massiot <[e-mail]>
 *          Johan Bilien <[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
#define DEBUG
#include "dvbpsi.h"
#include "../dvbpsi_private.h"
#include "psi.h"
#include "descriptor.h"
#include "demux.h"
#include "datetime.h"
#include "eit.h"
#include "eit_private.h"

#include "objects.h"

/*****************************************************************************
 * dvbpsi_AttachEIT
 *****************************************************************************
 * Initialize a EIT subtable decoder.
 *****************************************************************************/
int dvbpsi_AttachEIT(dvbpsi_decoder_t * p_psi_decoder, uint8_t i_table_id,
          uint16_t i_extension, dvbpsi_eit_callback pf_callback,
                               void* p_cb_data)
{
  dvbpsi_demux_t* p_demux = (dvbpsi_demux_t*)p_psi_decoder->p_private_decoder;
  dvbpsi_demux_subdec_t* p_subdec;
  dvbpsi_eit_decoder_t*  p_eit_decoder;
  unsigned int i;

  if(dvbpsi_demuxGetSubDec(p_demux, i_table_id, i_extension))
  {
    DVBPSI_ERROR_ARG("EIT decoder",
                     "Already a decoder for (table_id == 0x%02x,"
                     "extension == 0x%02x)",
                     i_table_id, i_extension);

    return 1;
  }

  p_subdec = (dvbpsi_demux_subdec_t*)malloc(sizeof(dvbpsi_demux_subdec_t));
  if(p_subdec == NULL)
  {
    return 1;
  }

  p_eit_decoder = (dvbpsi_eit_decoder_t*)malloc(sizeof(dvbpsi_eit_decoder_t));

  if(p_eit_decoder == NULL)
  {
    free(p_subdec);
    return 1;
  }

  /* subtable decoder configuration */
  p_subdec->pf_callback = &dvbpsi_GatherEITSections;
  p_subdec->p_cb_data = p_eit_decoder;
  p_subdec->i_id = (uint32_t)i_table_id << 16 | (uint32_t)i_extension;
  p_subdec->pf_detach = dvbpsi_DetachEIT;

  /* Attach the subtable decoder to the demux */
  p_subdec->p_next = p_demux->p_first_subdec;
  p_demux->p_first_subdec = p_subdec;

  /* EIT decoder information */
  p_eit_decoder->pf_callback = pf_callback;
  p_eit_decoder->p_cb_data = p_cb_data;
  /* EIT decoder initial state */
  p_eit_decoder->b_current_valid = 0;
  p_eit_decoder->p_building_eit = NULL;
  for(i = 0; i <= 255; i++)
    p_eit_decoder->ap_sections[i] = NULL;

  return 0;
}


/*****************************************************************************
 * dvbpsi_DetachEIT
 *****************************************************************************
 * Close a EIT decoder.
 *****************************************************************************/
void dvbpsi_DetachEIT(dvbpsi_demux_t * p_demux, uint8_t i_table_id,
          uint16_t i_extension)
{
  dvbpsi_demux_subdec_t* p_subdec;
  dvbpsi_demux_subdec_t** pp_prev_subdec;
  dvbpsi_eit_decoder_t* p_eit_decoder;

  unsigned int i;

  p_subdec = dvbpsi_demuxGetSubDec(p_demux, i_table_id, i_extension);

  if(p_demux == NULL)
  {
    DVBPSI_ERROR_ARG("EIT Decoder",
                     "No such EIT decoder (table_id == 0x%02x,"
                     "extension == 0x%02x)",
                     i_table_id, i_extension);
    return;
  }

  p_eit_decoder = (dvbpsi_eit_decoder_t*)p_subdec->p_cb_data;

  if (p_eit_decoder->p_building_eit)
  {
    ObjectRefDec(p_eit_decoder->p_building_eit);
  }

  for(i = 0; i <= 255; i++)
  {
    if(p_eit_decoder->ap_sections[i])
      dvbpsi_DeletePSISections(p_eit_decoder->ap_sections[i]);
  }

  free(p_subdec->p_cb_data);

  pp_prev_subdec = &p_demux->p_first_subdec;
  while(*pp_prev_subdec != p_subdec)
    pp_prev_subdec = &(*pp_prev_subdec)->p_next;

  *pp_prev_subdec = p_subdec->p_next;
  free(p_subdec);
}


/*****************************************************************************
 * dvbpsi_InitEIT
 *****************************************************************************
 * Initialize a pre-allocated dvbpsi_eit_t structure.
 *****************************************************************************/
void dvbpsi_InitEIT(dvbpsi_eit_t* p_eit, uint16_t i_service_id, uint8_t i_version,
                    int b_current_next, uint16_t i_ts_id, uint16_t i_network_id,
                    uint8_t i_segment_last_section_number,
                    uint8_t i_last_table_id)
{
  p_eit->i_service_id = i_service_id;
  p_eit->i_version = i_version;
  p_eit->b_current_next = b_current_next;
  p_eit->i_ts_id = i_ts_id;
  p_eit->i_network_id = i_network_id;
  p_eit->i_segment_last_section_number = i_segment_last_section_number;
  p_eit->i_last_table_id = i_last_table_id;
  p_eit->p_first_event = NULL;
}


/*****************************************************************************
 * dvbpsi_EmptyEIT
 *****************************************************************************
 * Clean a dvbpsi_eit_t structure.
 *****************************************************************************/
void dvbpsi_EmptyEIT(dvbpsi_eit_t* p_eit)
{
  dvbpsi_eit_event_t* p_event = p_eit->p_first_event;
  while(p_event != NULL)
  {
    dvbpsi_eit_event_t* p_tmp = p_event->p_next;
    dvbpsi_DeleteDescriptors(p_event->p_first_descriptor);
    free(p_event);
    p_event = p_tmp;
  }

  p_eit->p_first_event = NULL;
}


/*****************************************************************************
 * dvbpsi_EITAddEvent
 *****************************************************************************
 * Add an event description at the end of the EIT.
 *****************************************************************************/
dvbpsi_eit_event_t* dvbpsi_EITAddEvent(dvbpsi_eit_t* p_eit,
    uint16_t i_event_id, dvbpsi_date_time_t *p_start_time, 
    dvbpsi_eit_event_duration_t *p_duration, uint8_t i_running_status, 
    int b_free_ca)
{
  dvbpsi_eit_event_t* p_event
                = (dvbpsi_eit_event_t*)malloc(sizeof(dvbpsi_eit_event_t));

  if(p_event)
  {
    p_event->i_event_id = i_event_id;
    p_event->t_start_time = *p_start_time;
    p_event->t_duration = *p_duration;
    p_event->i_running_status = i_running_status;
    p_event->b_free_ca = b_free_ca;
    p_event->p_next = NULL;
    p_event->p_first_descriptor = NULL;

    if(p_eit->p_first_event == NULL)
    {
      p_eit->p_first_event = p_event;
    }
    else
    {
      dvbpsi_eit_event_t* p_last_event = p_eit->p_first_event;
      while(p_last_event->p_next != NULL)
        p_last_event = p_last_event->p_next;
      p_last_event->p_next = p_event;
    }
  }

  return p_event;
}


/*****************************************************************************
 * dvbpsi_EITEventAddDescriptor
 *****************************************************************************
 * Add a descriptor in the EIT event description.
 *****************************************************************************/
dvbpsi_descriptor_t* dvbpsi_EITEventAddDescriptor(
                                               dvbpsi_eit_event_t* p_event,
                                               uint8_t i_tag, uint8_t i_length,
                                               uint8_t* p_data)
{
  dvbpsi_descriptor_t* p_descriptor
                        = dvbpsi_NewDescriptor(i_tag, i_length, p_data);

  if(p_descriptor)
  {
    if(p_event->p_first_descriptor == NULL)
    {
      p_event->p_first_descriptor = p_descriptor;
    }
    else
    {
      dvbpsi_descriptor_t* p_last_descriptor = p_event->p_first_descriptor;
      while(p_last_descriptor->p_next != NULL)
        p_last_descriptor = p_last_descriptor->p_next;
      p_last_descriptor->p_next = p_descriptor;
    }
  }

  return p_descriptor;
}


/*****************************************************************************
 * dvbpsi_GatherEITSections
 *****************************************************************************
 * Callback for the subtable demultiplexor.
 *****************************************************************************/
void dvbpsi_GatherEITSections(dvbpsi_decoder_t * p_psi_decoder,