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

 * helpers.h: WEBVTT helper

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

 * Copyright (C) 2020 VideoLabs, VLC authors and VideoLAN

 *

 * 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 Lesser 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.

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

#ifndef WEBVTT_HELPERS_H

#define WEBVTT_HELPERS_H

#ifdef __cplusplus

extern "C" {

#endif /* __cplusplus */

struct webvtt_cueelements_s

{

    struct

    {

        const uint8_t *p_data;

        size_t i_data;

    } iden, sttg, payl;

};

static inline size_t

WEBVTT_Pack_CueElementsGetNewSize( const struct webvtt_cueelements_s *els )

{

    return 8 +

           (els->iden.i_data ? (els->iden.i_data + 8) : 0) +

           (els->sttg.i_data ? (els->sttg.i_data + 8) : 0) +

           els->payl.i_data + 8;

}

static inline void

WEBVTT_Pack_CueElements( const struct webvtt_cueelements_s *els,

                         uint8_t *p_dst )

{

    size_t i_total = WEBVTT_Pack_CueElementsGetNewSize( els );

    /* root container */

    SetDWBE( &p_dst[0], i_total );

    memcpy(  &p_dst[4], "vttc", 4 );

    p_dst += 8;

    /* id child */

    if( els->iden.i_data )

    {

        SetDWBE( &p_dst[0], 8 + els->iden.i_data );

        memcpy(  &p_dst[4], "iden", 4 );

        memcpy(  &p_dst[8], els->iden.p_data, els->iden.i_data );

        p_dst += 8 + els->iden.i_data;

    }

    /* cue settings child */

    if( els->sttg.i_data )

    {

        SetDWBE( &p_dst[0], 8 + els->sttg.i_data );

        memcpy(  &p_dst[4], "sttg", 4 );

        memcpy(  &p_dst[8], els->sttg.p_data, els->sttg.i_data );

        p_dst += 8 + els->sttg.i_data;

    }

    /* text */

    SetDWBE( &p_dst[0], 8 + els->payl.i_data );

    memcpy(  &p_dst[4], "payl", 4 );

    memcpy(  &p_dst[8], els->payl.p_data, els->payl.i_data );

}

#ifdef __cplusplus

}

#endif /* __cplusplus */

#endif