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/*****************************************************************************
* psi.h
* (c)2001-2002 VideoLAN
* $Id: psi.h 88 2004-02-24 14:31:18Z sam $
*
* Authors: Arnaud de Bossoreille de Ribou <bozo@via.ecp.fr>
*
* 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.
*
*****************************************************************************/
/*!
* \file <psi.h>
* \author Arnaud de Bossoreille de Ribou <bozo@via.ecp.fr>
* \brief Common PSI tools.
*
* PSI section structure and its Manipulation tools.
*/
#ifndef _DVBPSI_PSI_H_
#define _DVBPSI_PSI_H_
#ifdef __cplusplus
extern "C" {
#endif
/*****************************************************************************
* dvbpsi_psi_section_t
*****************************************************************************/
/*!
* \struct dvbpsi_psi_section_s
* \brief PSI section structure.
*
* This structure is used to store a PSI section. The common information are
* decoded (ISO/IEC 13818-1 section 2.4.4.10).
*
* dvbpsi_psi_section_s::p_data stores the complete section including the
* header.
*
* When dvbpsi_psi_section_s::b_syntax_indicator == 0,
* dvbpsi_psi_section_s::p_payload_start points immediately after the
* section_length field and dvbpsi_psi_section_s::p_payload_end points
* immediately after the end of the section (don't try to access this byte).
*
* When dvbpsi_psi_section_s::b_syntax_indicator != 0,
* dvbpsi_psi_section_s::p_payload_start points immediately after the
* last_section_number field and dvbpsi_psi_section_s::p_payload_end points to
* the first byte of the CRC_32 field.
*
* When dvbpsi_psi_section_s::b_syntax_indicator == 0
* dvbpsi_psi_section_s::i_extension, dvbpsi_psi_section_s::i_version,
* dvbpsi_psi_section_s::b_current_next, dvbpsi_psi_section_s::i_number,
* dvbpsi_psi_section_s::i_last_number, and dvbpsi_psi_section_s::i_crc are
* undefined.
*/
struct dvbpsi_psi_section_s
{
/* non-specific section data */
uint8_t i_table_id; /*!< table_id */
int b_syntax_indicator; /*!< section_syntax_indicator */
int b_private_indicator; /*!< private_indicator */
uint16_t i_length; /*!< section_length */
/* used if b_syntax_indicator is true */
uint16_t i_extension; /*!< table_id_extension */
/*!< transport_stream_id for a
PAT section */
uint8_t i_version; /*!< version_number */
int b_current_next; /*!< current_next_indicator */
uint8_t i_number; /*!< section_number */
uint8_t i_last_number; /*!< last_section_number */
/* non-specific section data */
/* the content is table-specific */
uint8_t * p_data; /*!< complete section */
uint8_t * p_payload_start; /*!< payload start */
uint8_t * p_payload_end; /*!< payload end */
/* used if b_syntax_indicator is true */
uint32_t i_crc; /*!< CRC_32 */
/* for reusing this section */
uint32_t i_max_size; /*!< maximum size of p_data */
/* list handling */
struct dvbpsi_psi_section_s * p_next; /*!< next element of
the list */
};
/*****************************************************************************
* dvbpsi_ClaimPSISection
*****************************************************************************/
/*!
* \fn dvbpsi_psi_section_t * dvbpsi_ClaimPSISection(int i_max_size)
* \brief Return a previously released section if one is available or create a new one.
* \param h_dvbpsi Handle to retrieve the currently unused section from.
* \param i_max_size max size in bytes of the section
* \return a pointer to the new PSI section structure.
*/
dvbpsi_psi_section_t * dvbpsi_ClaimPSISection(dvbpsi_handle h_dvbpsi, int i_max_size);
/*****************************************************************************
* dvbpsi_ReleasePSISections
*****************************************************************************/
/*!
* \fn void dvbpsi_ReleasePSISections(dvbpsi_psi_section_t * p_section)
* \brief Release a section so it can be reused.
* \param h_dvbpsi Handle to store the unused sections in.
* \param p_section pointer to the first PSI section structure
* \return nothing.
*/
void dvbpsi_ReleasePSISections(dvbpsi_handle h_dvbpsi, dvbpsi_psi_section_t * p_section);
/*****************************************************************************
* dvbpsi_ClonePSISection
*****************************************************************************/
/*!
* \fn void dvbpsi_ClonePSISection(dvbpsi_handle h_dvbpsi, dvbpsi_psi_section_t * p_section)
* \brief Release a section so it can be reused.
* \param h_dvbpsi Handle to retrieve the currently unused section from.
* \param p_section pointer to the PSI section structure to clone.
* \return a pointer to the new PSI section structure.
*/
dvbpsi_psi_section_t * dvbpsi_ClonePSISection(dvbpsi_handle h_dvbpsi, dvbpsi_psi_section_t * p_section);
/*****************************************************************************
* dvbpsi_NewPSISection
*****************************************************************************/
/*!
* \fn dvbpsi_psi_section_t * dvbpsi_NewPSISection(int i_max_size)
* \brief Creation of a new dvbpsi_psi_section_t structure.
* \param i_max_size max size in bytes of the section
* \return a pointer to the new PSI section structure.
*/
dvbpsi_psi_section_t * dvbpsi_NewPSISection(int i_max_size);
/*****************************************************************************
* dvbpsi_DeletePSISections
*****************************************************************************/
/*!
* \fn void dvbpsi_DeletePSISections(dvbpsi_psi_section_t * p_section)
* \brief Destruction of a dvbpsi_psi_section_t structure.
* \param p_section pointer to the first PSI section structure
* \return nothing.
*/
void dvbpsi_DeletePSISections(dvbpsi_psi_section_t * p_section);
/*****************************************************************************
* dvbpsi_ValidPSISection
*****************************************************************************/
/*!
* \fn int dvbpsi_ValidPSISection(dvbpsi_psi_section_t* p_section)
* \brief Validity check of a PSI section.
* \param p_section pointer to the PSI section structure
* \return boolean value (0 if the section is not valid).
*
* Check the CRC_32 if the section has b_syntax_indicator set.
*/
int dvbpsi_ValidPSISection(dvbpsi_psi_section_t* p_section);
/*****************************************************************************
* dvbpsi_BuildPSISection
*****************************************************************************/
/*!
* \fn void dvbpsi_BuildPSISection(dvbpsi_psi_section_t* p_section)
* \brief Build a valid section based on the information in the structure.
* \param p_section pointer to the PSI section structure
* \return nothing.
*/
void dvbpsi_BuildPSISection(dvbpsi_psi_section_t* p_section);
#ifdef __cplusplus
};
#endif
#endif
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