atsc_vct.c

Dvbstreamer 用在解析MPTS的部分内容

/*
Copyright (C) 2006  Adam Charrett

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., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA

vct.c

Decode PSIP Virtual Channel Table.

*/
#include "config.h"

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

#include "dvbpsi.h"
#include "dvbpsi_private.h"
#include "psi.h"
#include "descriptor.h"
#include "demux.h"
#include "atsc/vct.h"

#include "objects.h"

typedef struct dvbpsi_atsc_vct_decoder_s
{
  dvbpsi_atsc_vct_callback      pf_callback;
  void *                        p_cb_data;

  dvbpsi_atsc_vct_t             current_vct;
  dvbpsi_atsc_vct_t *           p_building_vct;

  int                           b_current_valid;

  uint8_t                       i_last_section_number;
  dvbpsi_psi_section_t *        ap_sections [256];

} dvbpsi_atsc_vct_decoder_t;

dvbpsi_descriptor_t *dvbpsi_atsc_VCTAddDescriptor(
                                               dvbpsi_atsc_vct_t *p_vct,
                                               uint8_t i_tag, uint8_t i_length,
                                               uint8_t *p_data);

dvbpsi_atsc_vct_channel_t *dvbpsi_atsc_VCTAddChannel(dvbpsi_atsc_vct_t* p_vct,
                                            uint8_t *p_short_name,
                                            uint16_t i_major_number,
                                            uint16_t i_minor_number,
                                            uint8_t  i_modulation,
                                            uint32_t i_carrier_freq,
                                            uint16_t i_channel_tsid,
                                            uint16_t i_program_number,
                                            uint8_t  i_etm_location,
                                            int      b_access_controlled,
                                            int      b_hidden,
                                            int      b_path_select,
                                            int      b_out_of_band,
                                            int      b_hide_guide,
                                            uint8_t  i_service_type,
                                            uint16_t i_source_id);

dvbpsi_descriptor_t *dvbpsi_atsc_VCTChannelAddDescriptor(
                                               dvbpsi_atsc_vct_channel_t *p_table,
                                               uint8_t i_tag, uint8_t i_length,
                                               uint8_t *p_data);

void dvbpsi_atsc_GatherVCTSections(dvbpsi_decoder_t * p_psi_decoder,
                              void * p_private_decoder,
                              dvbpsi_psi_section_t * p_section);

void dvbpsi_atsc_DecodeVCTSections(dvbpsi_atsc_vct_t* p_vct,
                              dvbpsi_psi_section_t* p_section);

/*****************************************************************************
 * dvbpsi_atsc_AttachVCT
 *****************************************************************************
 * Initialize a VCT subtable decoder.
 *****************************************************************************/
int dvbpsi_atsc_AttachVCT(dvbpsi_decoder_t * p_psi_decoder, uint8_t i_table_id, uint16_t i_extension,
                          dvbpsi_atsc_vct_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_atsc_vct_decoder_t*  p_vct_decoder;
  unsigned int i;

  if(dvbpsi_demuxGetSubDec(p_demux, i_table_id, i_extension))
  {
    DVBPSI_ERROR_ARG("VCT decoder",
                     "Already a decoder for (table_id == 0x%02x extension == 0x%04x)",
                     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_vct_decoder = (dvbpsi_atsc_vct_decoder_t*)malloc(sizeof(dvbpsi_atsc_vct_decoder_t));

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

  /* subtable decoder configuration */
  p_subdec->pf_callback = &dvbpsi_atsc_GatherVCTSections;
  p_subdec->p_cb_data = p_vct_decoder;
  p_subdec->i_id = ((uint32_t)i_table_id << 16) | i_extension;
  p_subdec->pf_detach = dvbpsi_atsc_DetachVCT;

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

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

  return 0;
}


/*****************************************************************************
 * dvbpsi_atsc_DetachVCT
 *****************************************************************************
 * Close a VCT decoder.
 *****************************************************************************/
void dvbpsi_atsc_DetachVCT(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_atsc_vct_decoder_t* p_vct_decoder;

  unsigned int i;

  p_subdec = dvbpsi_demuxGetSubDec(p_demux, i_table_id, i_extension);

  if(p_demux == NULL)
  {
    DVBPSI_ERROR_ARG("VCT Decoder",
                     "No such VCT decoder (table_id == 0x%02x,"
                     "extension == 0x%04x)",
                     i_table_id, i_extension);
    return;
  }

  p_vct_decoder = (dvbpsi_atsc_vct_decoder_t*)p_subdec->p_cb_data;
  if (p_vct_decoder->p_building_vct)
  {
    ObjectRefDec(p_vct_decoder->p_building_vct);
  }

  for(i = 0; i <= 255; i++)
  {
    if(p_vct_decoder->ap_sections[i])
      dvbpsi_DeletePSISections(p_vct_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_atsc_InitVCT
 *****************************************************************************
 * Initialize a pre-allocated dvbpsi_atsc_vct_t structure.
 *****************************************************************************/
void dvbpsi_atsc_InitVCT(dvbpsi_atsc_vct_t* p_vct,uint8_t i_version, int b_current_next,
                       uint8_t i_protocol, uint16_t i_ts_id, int b_cable_vct)
{
  p_vct->i_version = i_version;
  p_vct->b_current_next = b_current_next;
  p_vct->i_protocol = i_protocol;
  p_vct->i_ts_id = i_ts_id;
  p_vct->b_cable_vct = b_cable_vct;
  p_vct->p_first_channel = NULL;
  p_vct->p_first_descriptor = NULL;
}


/*****************************************************************************
 * dvbpsi_atsc_EmptyVCT
 *****************************************************************************
 * Clean a dvbpsi_atsc_vct_t structure.
 *****************************************************************************/
void dvbpsi_atsc_EmptyVCT(dvbpsi_atsc_vct_t* p_vct)
{
  dvbpsi_atsc_vct_channel_t* p_channel = p_vct->p_first_channel;

  while(p_channel != NULL)
  {
    dvbpsi_atsc_vct_channel_t* p_tmp = p_channel->p_next;
    dvbpsi_DeleteDescriptors(p_channel->p_first_descriptor);
    free(p_channel);
    p_channel = p_tmp;
  }
  dvbpsi_DeleteDescriptors(p_vct->p_first_descriptor);    
  p_vct->p_first_channel = NULL;
  p_vct->p_first_descriptor = NULL;
}

/*****************************************************************************
 * dvbpsi_atsc_VCTAddDescriptor
 *****************************************************************************
 * Add a descriptor to the VCT table.
 *****************************************************************************/
dvbpsi_descriptor_t *dvbpsi_atsc_VCTAddDescriptor(
                                               dvbpsi_atsc_vct_t *p_vct,
                                               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_vct->p_first_descriptor == NULL)
    {
      p_vct->p_first_descriptor = p_descriptor;
    }
    else
    {
      dvbpsi_descriptor_t * p_last_descriptor = p_vct->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_atsc_VCTAddChannel
 *****************************************************************************
 * Add a Channel description at the end of the VCT.
 *****************************************************************************/
dvbpsi_atsc_vct_channel_t *dvbpsi_atsc_VCTAddChannel(dvbpsi_atsc_vct_t* p_vct,
                                            uint8_t *p_short_name,
                                            uint16_t i_major_number,
                                            uint16_t i_minor_number,
                                            uint8_t  i_modulation,
                                            uint32_t i_carrier_freq,
                                            uint16_t i_channel_tsid,
                                            uint16_t i_program_number,
                                            uint8_t  i_etm_location,
                                            int      b_access_controlled,
                                            int      b_hidden,
                                            int      b_path_select,
                                            int      b_out_of_band,
                                            int      b_hide_guide,
                                            uint8_t  i_service_type,
                                            uint16_t i_source_id)
{
  dvbpsi_atsc_vct_channel_t * p_channel
                = (dvbpsi_atsc_vct_channel_t*)malloc(sizeof(dvbpsi_atsc_vct_channel_t));

  if(p_channel)
  {
    memcpy(p_channel->i_short_name, p_short_name, sizeof(uint16_t) * 7);
    p_channel->i_major_number = i_major_number;
    p_channel->i_minor_number = i_minor_number;
    p_channel->i_modulation = i_modulation;
    p_channel->i_carrier_freq = i_carrier_freq;
    p_channel->i_channel_tsid = i_channel_tsid;
    p_channel->i_program_number = i_program_number;
    p_channel->i_etm_location = i_etm_location;
    p_channel->b_access_controlled = b_access_controlled;
    p_channel->b_path_select = b_path_select;
    p_channel->b_out_of_band = b_out_of_band;
    p_channel->b_hidden = b_hidden;
    p_channel->b_hide_guide = b_hide_guide;
    p_channel->i_service_type = i_service_type;
    p_channel->i_source_id = i_source_id;
    
    p_channel->p_first_descriptor = NULL;
    p_channel->p_next = NULL;

    if(p_vct->p_first_channel== NULL)
    {
      p_vct->p_first_channel = p_channel;
    }
    else