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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set et sw=2 ts=2: */
/***************************************************************************
* lrtp.h
*
* Mon Sep 2 12:10:40 CEST 2013
* Copyright 2013 Bent Bisballe Nyeng
* deva@aasimon.org
****************************************************************************/
/*
* This file is part of lrtp.
*
* lrtp 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.
*
* lrtp 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 lrtp; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#ifndef __LRTP_LRTP_H__
#define __LRTP_LRTP_H__
#ifdef WIN32
#ifdef BUILD_DLL
/* DLL export */
#define EXPORT __declspec(dllexport)
#else
/* EXE import */
#define EXPORT __declspec(dllimport)
#endif
#else
#define EXPORT
#endif
#ifdef __cplusplus
extern "C" {
#endif
#include <stdlib.h>
#include "lrtp_profiles.h"
/**
* Status return codes. Note that all of these values (except @ref ERROR_OK)
* are negative. The reason for this is that many functions return a size or
* a negative integer (one of these values) in case of error.
*/
enum lrtp_status_t {
LRTP_OK = 0, ///< All went well.
LRTP_UNKNOWN = -1, ///< An unknown error occurred.
LRTP_MISSING_HANDLE = -2, ///< The handle is corrupted or NULL.
LRTP_OUT_OF_MEMORY = -3, ///< Out of memory error.
// SRTP errors
LRTP_SRTP_FAIL = -4, ///< unspecified failure
LRTP_SRTP_BAD_PARAM = -5, ///< unsupported parameter
LRTP_SRTP_ALLOC_FAIL = -6, ///< couldn't allocate memory
LRTP_SRTP_DEALLOC_FAIL = -7, ///< couldn't deallocate properly
LRTP_SRTP_INIT_FAIL = -8, ///< couldn't initialize
LRTP_SRTP_TERMINUS = -9, ///< can't process as much data as requested
LRTP_SRTP_AUTH_FAIL = -10, ///< authentication failure
LRTP_SRTP_CIPHER_FAIL = -11, ///< cipher failure
LRTP_SRTP_REPLAY_FAIL = -12, ///< replay check failed (bad index)
LRTP_SRTP_REPLAY_OLD = -13, ///< replay check failed (index too old)
LRTP_SRTP_ALGO_FAIL = -14, ///< algorithm failed test routine
LRTP_SRTP_NO_SUCH_OP = -15, ///< unsupported operation
LRTP_SRTP_NO_CTX = -16, ///< no appropriate context found
LRTP_SRTP_CANT_CHECK = -17, ///< unable to perform desired validation
LRTP_SRTP_KEY_EXPIRED = -18, ///< can't use key any more
LRTP_SRTP_SOCKET_ERR = -19, ///< error in use of socket
LRTP_SRTP_SIGNAL_ERR = -20, ///< error in use POSIX signals
LRTP_SRTP_NONCE_BAD = -21, ///< nonce check failed
LRTP_SRTP_READ_FAIL = -22, ///< couldn't read data
LRTP_SRTP_WRITE_FAIL = -23, ///< couldn't write data
LRTP_SRTP_PARSE_ERR = -24, ///< error pasring data
LRTP_SRTP_ENCODE_ERR = -25, ///< error encoding data
LRTP_SRTP_SEMAPHORE_ERR = -26, ///< error while using semaphores
LRTP_SRTP_PFKEY_ERR = -27, ///< error while using pfkey
LRTP_MISSING_CSRC = -28, ///< Invalid CSrc
LRTP_TOO_MANY_CSRCS = -29, ///< Exactly one csrc must be present.
LRTP_MISSING_PROFILE = -30, ///< CSrc from packet could not be connected with a profile..
LRTP_UNPACK_ERROR = -31, ///< Error unpacking RTP pakcet.
LRTP_BUFFER_TOO_SMALL = -32, ///< Supplied buffer was not big enough.
LRTP_CSRC_ALREADY_ACTIVE= -33, ///< CSrc already in session list.
};
struct lrtp_t;
/**
* Initialise lrtp.
* @param status A pointer to the function status code. If the function returns
* NULL this status code will indicate what went wrong. If status is NULL it
* will simply be ignored.
* @param key The key to be use in this session.
* @param ssrc The secure source to be used in the session.
* @return Returns the handle to the newly created session.
*/
EXPORT
struct lrtp_t *lrtp_init(enum lrtp_status_t *status,
const char *key, unsigned int ssrc);
/**
* Close session.
* @param lrtp The lrtp context handle to be closed.
* @return LRTP_OK on success, or LRTP_MISSING_HANDLE if handle was broken or
* NULL.
*/
EXPORT
enum lrtp_status_t lrtp_close(struct lrtp_t *lrtp);
/**
* Create a new profile to be used in the lrtp_enqueue_frame and
* lrtp_dequeue_frame function calls.
* The profile is referenced byt ccsrc, so this must be unique to the active
* session.
* @param lrtp The lrtp context handle.
* @param profile_id See lrtp_profiles.h for possible values.
* @param csrc The csrc to be connected with this profile.
* @param ... Options for the profile. See lrtp_profiles.h for possible values.
* @return TODO: TBD
*/
EXPORT
enum lrtp_status_t lrtp_create_profile(struct lrtp_t *lrtp,
lrtp_profile_id_t profile_id,
unsigned int csrc, ...);
/**
* Free all resources connected with a profile.
* @param lrtp The lrtp context handle.
* @param csrc The csrc of the profile to be freed.
* @return TODO: TBD
*/
EXPORT
enum lrtp_status_t lrtp_destroy_profile(struct lrtp_t *lrtp, unsigned int csrc);
/**
* Enqueue a media frame for the packetiser.
* @param profile A pointer to profile needed for processing the frame type.
* @param framedate The frame data that needs encapsulation.
* @param framesize The size in bytes of the frame data.
* @return TODO: TBD
* @return 0 on success, or a negative error code on error.
* WARNING: The frame pointer cannot be freed or overwritten until all frame
* data has been handled by lrtp_pack(). Either call lrtp_pack() until it
* returns 0 after each call to lrtp_enqueue_frame or use the
* OPTION_SET_PROCESS_FINISHED_HANDLER option to set a process finished handler.
* See lrtp_profiles.h for further details.
*/
EXPORT
enum lrtp_status_t lrtp_enqueue_frame(struct lrtp_t *lrtp, unsigned int csrc,
char *framedate, size_t framesize,
unsigned long int timestamp);
/**
* Handle frame data from the frame queue and create at most a single sRTP
* packet.
* @param lrtp The lrtp context handle.
* @param packet A char buffer which will contain the resulting RTP data.
* @param maxsize the maximum number of bytes that can be contained within
* packet.
* @return Returns the number of bytes written in packet, if any (can be zero
* if no packet is available) or a negative error code on error.
*/
EXPORT int lrtp_pack(struct lrtp_t *lrtp, char *packet, size_t maxsize);
/**
* Dequeue a frame from the frame queue.
* @param lrtp The lrtp context handle.
* @param frame A pointer to a char buffer in which the frame will be written.
* @param maxsize The size of the char buffer stored in 'frame'.
* @param csrc The csrc of the dequeued frame is returned in this pointer.
* @param ts The timestamp of the dequeued frame is returned in this pointer.
* @return The size of the returned frame or a negative error code on error.
*/
EXPORT
int lrtp_dequeue_frame(struct lrtp_t *lrtp,
char *frame, size_t maxsize,
unsigned int *csrc, unsigned int *ts);
/**
* Unpack packet from UDP stream. The packet will be cached, unpacked and (if a
* complete frame has been received) be pushed to the frame queue.
* @param lrtp The lrtp context handle.
* @param packet The packet data.
* @param size The size of the packet.
* @return TODO: TBD
*/
EXPORT
enum lrtp_status_t lrtp_unpack(struct lrtp_t *lrtp,
const char *packet, size_t size);
#ifdef __cplusplus
}
#endif
#endif/*__LRTP_LRTP_H__*/
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