/usr/include/bitstream/dvb/si/bat.h

/*****************************************************************************
 * bat.h: ETSI EN 300 468 Bouquet Association Table (BAT)
 *****************************************************************************
 * Copyright (C) 2009-2010 VideoLAN
 *
 * Authors: Christophe Massiot <massiot@via.ecp.fr>
 *          Georgi Chorbadzhiyski <georgi@unixsol.org>
 *
 * Permission is hereby granted, free of charge, to any person obtaining
 * a copy of this software and associated documentation files (the
 * "Software"), to deal in the Software without restriction, including
 * without limitation the rights to use, copy, modify, merge, publish,
 * distribute, sublicense, and/or sell copies of the Software, and to
 * permit persons to whom the Software is furnished to do so, subject
 * to the following conditions:
 *
 * The above copyright notice and this permission notice shall be
 * included in all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
 * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
 * CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
 * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
 * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 *****************************************************************************/

/*
 * Normative references:
 *  - ETSI EN 300 468 V1.11.1 (2010-04) (SI in DVB systems)
 */

#ifndef __BITSTREAM_DVB_BAT_H__
#define __BITSTREAM_DVB_BAT_H__

#include <bitstream/common.h>
#include <bitstream/mpeg/psi/psi.h>
#include <bitstream/mpeg/psi/descriptors.h>
#include <bitstream/dvb/si/nit.h>

#ifdef __cplusplus
extern "C"
{
#endif

/*****************************************************************************
 * Bouquet Association Table
 *****************************************************************************/
#define BAT_PID                 0x11
#define BAT_TABLE_ID            0x4a
#define BAT_HEADER_SIZE         (PSI_HEADER_SIZE_SYNTAX1 + 2)
#define BAT_HEADER2_SIZE        2
#define BAT_TS_SIZE             6

#define bat_set_bouquet_id psi_set_tableidext
#define bat_get_bouquet_id psi_get_tableidext

static inline void bat_init(uint8_t *p_bat)
{
    psi_init(p_bat, true);
    psi_set_tableid(p_bat, BAT_TABLE_ID);
    p_bat[8] = 0xf0;
}

#define bat_set_length      nit_set_length
#define bat_set_desclength  nit_set_desclength
#define bat_get_desclength  nit_get_desclength
#define bat_get_descs       nit_get_descs
#define bath_init           nith_init
#define bath_set_tslength   nith_set_tslength
#define bath_get_tslength   nith_get_tslength
#define bat_get_header2     nit_get_header2
#define batn_init           nitn_init
#define batn_set_tsid       nitn_set_tsid
#define batn_get_tsid       nitn_get_tsid
#define batn_set_onid       nitn_set_onid
#define batn_get_onid       nitn_get_onid
#define batn_set_desclength nitn_set_desclength
#define batn_get_desclength nitn_get_desclength
#define batn_get_descs      nitn_get_descs
#define bat_get_ts          nit_get_ts
#define bat_validate_ts     nit_validate_ts
#define bat_table_find_ts   nit_table_find_ts
#define bat_table_validate  nit_table_validate

static inline bool bat_validate(const uint8_t *p_bat)
{
    uint16_t i_section_size = psi_get_length(p_bat) + PSI_HEADER_SIZE
                               - PSI_CRC_SIZE;
    const uint8_t *p_bat_n;

    if (!psi_get_syntax(p_bat) || psi_get_tableid(p_bat) != BAT_TABLE_ID)
        return false;

    if (i_section_size < BAT_HEADER_SIZE
         || i_section_size < BAT_HEADER_SIZE + bat_get_desclength(p_bat))
        return false;

    if (!descs_validate(p_bat + 8))
        return false;

    p_bat_n = p_bat + BAT_HEADER_SIZE + bat_get_desclength(p_bat);

    if (bath_get_tslength(p_bat_n) != p_bat + i_section_size - p_bat_n
         - BAT_HEADER2_SIZE)
        return false;
    p_bat_n += BAT_HEADER2_SIZE;

    while (p_bat_n + BAT_TS_SIZE - p_bat <= i_section_size
            && p_bat_n + BAT_TS_SIZE + batn_get_desclength(p_bat_n) - p_bat
                <= i_section_size) {
        if (!descs_validate(p_bat_n + 4))
            return false;

        p_bat_n += BAT_TS_SIZE + batn_get_desclength(p_bat_n);
    }

    return (p_bat_n - p_bat == i_section_size);
}

#ifdef __cplusplus
}
#endif

#endif
libbitstream-dev 1.0-1 / usr / include / bitstream / dvb / si / bat.h
