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/** rtp.h
*
* Copyright (C) 2013 Tox project All Rights Reserved.
*
* This file is part of Tox.
*
* Tox 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 3 of the License, or
* (at your option) any later version.
*
* Tox 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 Tox. If not, see <http://www.gnu.org/licenses/>.
*
*/
#ifndef __TOXRTP
#define __TOXRTP
#define RTP_VERSION 2
#include <inttypes.h>
#include <pthread.h>
#include "../toxcore/util.h"
#include "../toxcore/network.h"
#include "../toxcore/net_crypto.h"
#include "../toxcore/Messenger.h"
#define MAX_SEQU_NUM 65535
#define MAX_RTP_SIZE 65535
/**
* @brief Standard rtp header
*
*/
typedef struct _RTPHeader {
uint8_t flags; /* Version(2),Padding(1), Ext(1), Cc(4) */
uint8_t marker_payloadt; /* Marker(1), PlayLoad Type(7) */
uint16_t sequnum; /* Sequence Number */
uint32_t timestamp; /* Timestamp */
uint32_t ssrc; /* SSRC */
uint32_t csrc[16]; /* CSRC's table */
uint32_t length; /* Length of the header in payload string. */
} RTPHeader;
/**
* @brief Standard rtp extension header.
*
*/
typedef struct _RTPExtHeader {
uint16_t type; /* Extension profile */
uint16_t length; /* Number of extensions */
uint32_t *table; /* Extension's table */
} RTPExtHeader;
/**
* @brief Standard rtp message.
*
*/
typedef struct _RTPMessage {
RTPHeader *header;
RTPExtHeader *ext_header;
uint8_t data[MAX_RTP_SIZE];
uint32_t length;
struct _RTPMessage *next;
} RTPMessage;
/**
* @brief Our main session descriptor.
* It measures the session variables and controls
* the entire session. There are functions for manipulating
* the session so tend to use those instead of directly modifying
* session parameters.
*
*/
typedef struct _RTPSession {
uint8_t version;
uint8_t padding;
uint8_t extension;
uint8_t cc;
uint8_t marker;
uint8_t payload_type;
uint16_t sequnum; /* Set when sending */
uint16_t rsequnum; /* Check when recving msg */
uint32_t timestamp;
uint32_t ssrc;
uint32_t *csrc;
/* If some additional data must be sent via message
* apply it here. Only by allocating this member you will be
* automatically placing it within a message.
*/
RTPExtHeader *ext_header;
/* Msg prefix for core to know when recving */
uint8_t prefix;
int dest;
int32_t call_index;
struct _ToxAv *av;
} RTPSession;
/**
* @brief Release all messages held by session.
*
* @param session The session.
* @return int
* @retval -1 Error occurred.
* @retval 0 Success.
*/
int rtp_release_session_recv ( RTPSession *session );
/**
* @brief Call this to change queue limit
*
* @param session The session
* @param limit new limit
* @return void
*/
void rtp_queue_adjust_limit ( RTPSession *session, uint64_t limit );
/**
* @brief Get's oldest message in the list.
*
* @param session Where the list is.
* @return RTPMessage* The message. You need to call rtp_msg_free() to free it.
* @retval NULL No messages in the list, or no list.
*/
RTPMessage *rtp_recv_msg ( RTPSession *session );
/**
* @brief Sends msg to _RTPSession::dest
*
* @param session The session.
* @param msg The message
* @param messenger Tox* object.
* @return int
* @retval -1 On error.
* @retval 0 On success.
*/
int rtp_send_msg ( RTPSession *session, Messenger *messenger, const uint8_t *data, uint16_t length );
/**
* @brief Speaks for it self.
*
* @param session The control session msg belongs to. It can be NULL.
* @param msg The message.
* @return void
*/
void rtp_free_msg ( RTPSession *session, RTPMessage *msg );
/**
* @brief Must be called before calling any other rtp function. It's used
* to initialize RTP control session.
*
* @param payload_type Type of payload used to send. You can use values in toxmsi.h::MSICallType
* @param messenger Tox* object.
* @param friend_num Friend id.
* @return RTPSession* Created control session.
* @retval NULL Error occurred.
*/
RTPSession *rtp_init_session ( int payload_type, Messenger *messenger, int friend_num );
/**
* @brief Terminate the session.
*
* @param session The session.
* @param messenger The messenger who owns the session
* @return int
* @retval -1 Error occurred.
* @retval 0 Success.
*/
void rtp_terminate_session ( RTPSession *session, Messenger *messenger );
#endif /* __TOXRTP */
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