c_rtp.h

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/*
 * 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
 */

#ifndef C_RTP_H
#define C_RTP_H

#include <netinet/ip.h>
#include <netinet/udp.h>

#include "c_generic.h"
#include "c_udp.h"
#include "ts_sc_comp.h"


struct rtp_tmp_variables
{
        int send_rtp_dynamic;

        int nr_ts_bits;

        int nr_ts_bits_ext3;

        unsigned int timestamp;

        int ts_send;

        int m_set;

        int rtp_pt_changed;

};


struct sc_rtp_context
{
        int udp_checksum_change_count;

        struct udphdr old_udp;

        int rtp_pt_change_count;

        struct rtphdr old_rtp;

        struct rtp_tmp_variables tmp_variables;

        struct c_wlsb *ts_window;

        int tss;

        int tis;

        struct ts_sc_comp ts_sc;
};


/*
 * Function prototypes.
 */

int c_rtp_create(struct c_context *context, const struct ip_packet ip);
void c_rtp_destroy(struct c_context *context);

int c_rtp_check_context(struct c_context *context, const struct ip_packet ip);

int c_rtp_encode(struct c_context *context,
                 const struct ip_packet ip,
                 int packet_size,
                 unsigned char *dest,
                 int dest_size,
                 int *payload_offset);

void rtp_decide_state(struct c_context *context);

int rtp_code_UO_packet_tail(struct c_context *context,
                            const unsigned char *next_header,
                            unsigned char *dest,
                            int counter);

int rtp_code_static_rtp_part(struct c_context *context,
                             const unsigned char *next_header,
                             unsigned char *dest,
                             int counter);

int rtp_code_dynamic_rtp_part(struct c_context *context,
                              const unsigned char *next_header,
                              unsigned char *dest,
                              int counter);

int rtp_changed_rtp_dynamic(struct c_context *context,
                            const struct udphdr *udp);


#endif