/* GStreamer plugin for forward error correction

 * Copyright (C) 2017 Pexip

 *

 * This library 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 library 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 library; if not, write to the Free Software

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

 *

 * Author: Mikhail Fludkov <misha@pexip.com>

 */

#ifndef __RTP_RED_COMMON_H__

#define __RTP_RED_COMMON_H__

#include <glib.h>

G_BEGIN_DECLS

typedef struct _RedBlockHeader RedBlockHeader;

/* RFC 2198 */

/*

    0                   1                   2                   3

    0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1

   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

   |F|   block PT  |  timestamp offset         |   block length    |

   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

*/

struct _RedBlockHeader {

#if G_BYTE_ORDER == G_LITTLE_ENDIAN

  guint pt:7;

  guint F:1;

  guint timestamp_offset_hi: 8;

  guint length_hi: 2;

  guint timestamp_offset_lo: 6;

  guint length_lo: 8;

#elif G_BYTE_ORDER == G_BIG_ENDIAN

  guint F:1;

  guint pt:7;

  guint timestamp_offset_hi: 8;

  guint timestamp_offset_lo: 6;

  guint length_hi: 2;

  guint length_lo: 8;

#else

#error "G_BYTE_ORDER should be big or little endian."

#endif

};

#define RED_BLOCK_TIMESTAMP_OFFSET_MAX ((1<<14) - 1)

#define RED_BLOCK_LENGTH_MAX ((1<<10) - 1)

gsize    rtp_red_block_header_get_length    (gboolean is_redundant);

gboolean rtp_red_block_is_redundant         (gpointer red_block);

void     rtp_red_block_set_payload_type     (gpointer red_block, guint8 pt);

void     rtp_red_block_set_timestamp_offset (gpointer red_block, guint16 timestamp_offset);

void     rtp_red_block_set_payload_length   (gpointer red_block, guint16 length);

guint16  rtp_red_block_get_timestamp_offset (gpointer red_block);

guint8   rtp_red_block_get_payload_type     (gpointer red_block);

void     rtp_red_block_set_is_redundant     (gpointer red_block, gboolean is_redundant);

guint16  rtp_red_block_get_payload_length   (gpointer red_block);

G_END_DECLS

#endif