/*****************************************************************************

 * scte18.h : SCTE-18 EAS decoder

 *****************************************************************************

 * Copyright (C) 2016 - VideoLAN Authors

 *

 * This program is free software; you can redistribute it and/or modify it

 * under the terms of the GNU Lesser General Public License as published by

 * the Free Software Foundation; either version 2.1 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 Lesser General Public License for more details.

 *

 * You should have received a copy of the GNU General Public License

 * along with this program.  If not, see <http://www.gnu.org/licenses/>.

 *****************************************************************************/

#ifndef VLC_SCTE18_H

#define VLC_SCTE18_H

#define SCTE18_SI_BASE_PID 0x1FFB

#define SCTE18_TABLE_ID    0xD8

#define SCTE18_DESCRIPTION N_("Emergency Alert Messaging for Cable")

enum

{

    EAS_PRIORITY_TEST = 0,

    EAS_PRIORITY_LOW = 3,

    EAS_PRIORITY_MEDIUM = 7,

    EAS_PRIORITY_HIGH = 11,

    EAS_PRIORITY_MAX = 15

};

/* Get priority without decoding

 */

static inline int scte18_get_EAS_priority( const uint8_t *p_buffer, size_t i_buffer )

{

    if( i_buffer < 17 || p_buffer[0] )

        return -1;

    size_t i_offset = 6;

    size_t i_len = p_buffer[i_offset]; /* EAS code Len */

    i_offset += i_len + 1; /* EAS code Text */

    if( i_offset >= i_buffer )

        return -1;

    i_len = p_buffer[i_offset]; /* NOA Len */

    i_offset += i_len + 1; /* NOA Text */

    i_offset += 1 + 4 + 2 + 1;

    if( i_offset >= i_buffer )

        return -1;

    return (p_buffer[i_offset] & 0x0f);

}

#endif