/*
 * Asterisk -- A telephony toolkit for Linux.
 *
 * Implementation of Inter-Asterisk eXchange
 *
 * Copyright (C) 1999, Mark Spencer
 *
 * Mark Spencer <markster@linux-support.net>
 *
 * This program is free software, distributed under the terms of
 * the GNU Lesser General Public License (LGPL)
 */

#ifndef _ASTERISK_IAX_CLIENT_H
#define _ASTERISK_IAX_CLIENT_H

#if defined(_MSC_VER)
/* disable zero-sized array in struct/union warning */
#pragma warning(disable:4200)
#endif

#ifdef WIN32
#define socklen_t int
#endif

#include "frame.h"
#include "iax2.h"
#include "iax2-parser.h"

#define MAXSTRLEN 80

#define IAX_AUTHMETHOD_PLAINTEXT IAX_AUTH_PLAINTEXT
#define IAX_AUTHMETHOD_MD5       IAX_AUTH_MD5

extern char iax_errstr[];

struct iax_session;


#define IAX_EVENT_CONNECT       0      /* Connect a new call */
#define IAX_EVENT_ACCEPT        1      /* Accept a call */
#define IAX_EVENT_HANGUP        2      /* Hang up a call */
#define IAX_EVENT_REJECT        3      /* Rejected call */
#define IAX_EVENT_VOICE         4      /* Voice Data */
#define IAX_EVENT_DTMF          5      /* A DTMF Tone */
#define IAX_EVENT_TIMEOUT       6      /* Connection timeout...  session
                                          will be a pointer to free()'d
                                          memory! */
#define IAX_EVENT_LAGRQ         7      /* Lag request -- Internal use only */
#define IAX_EVENT_LAGRP         8      /* Lag Measurement.  See event.lag */
#define IAX_EVENT_RINGA         9      /* Announce we/they are ringing */
#define IAX_EVENT_PING          10      /* Ping -- internal use only */
#define IAX_EVENT_PONG          11      /* Pong -- internal use only */
#define IAX_EVENT_BUSY          12      /* Report a line busy */
#define IAX_EVENT_ANSWER        13      /* Answer the line */

#define IAX_EVENT_IMAGE         14      /* Send/Receive an image */
#define IAX_EVENT_AUTHRQ        15      /* Authentication request */
#define IAX_EVENT_AUTHRP        16      /* Authentication reply */

#define IAX_EVENT_REGREQ        17      /* Registration request */
#define IAX_EVENT_REGACK        18      /* Registration reply */
#define IAX_EVENT_URL           19      /* URL received */
#define IAX_EVENT_LDCOMPLETE    20      /* URL loading complete */

#define IAX_EVENT_TRANSFER      21      /* Transfer has taken place */

#define IAX_EVENT_DPREQ         22      /* Dialplan request */
#define IAX_EVENT_DPREP         23      /* Dialplan reply */
#define IAX_EVENT_DIAL          24      /* Dial on a TBD call */

#define IAX_EVENT_QUELCH        25      /* Quelch Audio */
#define IAX_EVENT_UNQUELCH      26      /* Unquelch Audio */

#define IAX_EVENT_UNLINK        27      /* Unlink */
#define IAX_EVENT_LINKREJECT    28      /* Link Rejection */
#define IAX_EVENT_TEXT          29      /* Text Frame :-) */
#define IAX_EVENT_REGREJ        30      /* Registration reply */
#define IAX_EVENT_LINKURL       31      /* Unlink */
#define IAX_EVENT_CNG           32      /* Comfort-noise (almost silence) */
#define IAX_EVENT_POKE          33
#define IAX_EVENT_VIDEO         34      /* Send/receive video */


/* moved from iax.c to support attended transfer */
#define IAX_EVENT_REREQUEST     999
#define IAX_EVENT_TXREPLY       1000
#define IAX_EVENT_TXREJECT      1001
#define IAX_EVENT_TXACCEPT      1002
#define IAX_EVENT_TXREADY       1003

/*
 * Null event. We use it to notify back the caller that a frame has been
 * received and is queued for delivery
 * Applciations should simply ignore it
 */
#define IAX_EVENT_NULL          65535

#define IAX_SCHEDULE_FUZZ 0  /* ms of fuzz to drop */

#if defined(WIN32)  ||  defined(_WIN32_WCE)
#if defined(_MSC_VER)
typedef int (__stdcall *iax_sendto_t)(SOCKET, const void *, size_t, int,
		const struct sockaddr *, socklen_t);
typedef int (__stdcall *iax_recvfrom_t)(SOCKET, void *, size_t, int,
		struct sockaddr *, socklen_t *);
#else
typedef int PASCAL (*iax_sendto_t)(SOCKET, const char *, int, int,
		const struct sockaddr *, int);
typedef int PASCAL (*iax_recvfrom_t)(SOCKET, char *, int, int,
		struct sockaddr *, int *);
#endif
#else
typedef int (*iax_sendto_t)(int, const void *, size_t, int,
		const struct sockaddr *, socklen_t);
typedef int (*iax_recvfrom_t)(int, void *, size_t, int,
		struct sockaddr *, socklen_t *);
#endif

struct iax_event {
	int etype;                   /* Type of event */
	int subclass;                /* Subclass data (event specific) */
	unsigned int ts;             /* Timestamp */
	struct iax_session *session; /* Applicable session */
	int datalen;                 /* Length of raw data */
	struct iax_ies ies;          /* IE's for IAX2 frames */
	unsigned char data[0];       /* Raw data if applicable */
};

#if defined(__cplusplus)
extern "C"
{
#endif

/* All functions return 0 on success and -1 on failure unless otherwise
   specified */

/* Called to initialize IAX structures and sockets.  Returns actual
   portnumber (which it will try preferred portno first, but if not
   take what it can get */
extern int iax_init(int preferredportno);

/* Get filedescriptor for IAX to use with select or gtk_input_add */
extern int iax_get_fd(void);

/* Find out how many milliseconds until the next scheduled event */
extern int iax_time_to_next_event(void);

/* Generate a new IAX session */
extern struct iax_session *iax_session_new(void);

/* Return exactly one iax event (if there is one pending).  If blocking is
   non-zero, IAX will block until some event is received */
extern struct iax_event *iax_get_event(int blocking);


extern int iax_auth_reply(struct iax_session *session, char *password,
		char *challenge, int methods);

/* Free an event */
extern void iax_event_free(struct iax_event *event);

struct sockaddr_in;

/* Front ends for sending events */
extern int iax_send_dtmf(struct iax_session *session, char digit);
extern int iax_send_voice(struct iax_session *session, int format, unsigned char *data, int datalen, int samples);
extern int iax_send_cng(struct iax_session *session, int level, unsigned char *data, int datalen);
extern int iax_send_image(struct iax_session *session, int format, unsigned char *data, int datalen);
extern int iax_send_url(struct iax_session *session, const char *url, int link);
extern int iax_send_text(struct iax_session *session, const char *text);
extern int iax_send_ping(struct iax_session *session);
extern int iax_load_complete(struct iax_session *session);
extern int iax_reject(struct iax_session *session, char *reason);
extern int iax_busy(struct iax_session *session);
extern int iax_congestion(struct iax_session *session);
extern int iax_hangup(struct iax_session *session, char *byemsg);
extern int iax_call(struct iax_session *session, const char *cidnum, const char *cidname, const char *ich, const char *lang, int wait, int format, int capability);
extern int iax_accept(struct iax_session *session, int format);
extern int iax_answer(struct iax_session *session);
extern int iax_sendurl(struct iax_session *session, char *url);
extern int iax_send_unlink(struct iax_session *session);
extern int iax_send_link_reject(struct iax_session *session);
extern int iax_ring_announce(struct iax_session *session);
extern struct sockaddr_in iax_get_peer_addr(struct iax_session *session);
extern int iax_register(struct iax_session *session, const char *hostname, const char *peer, const char *secret, int refresh);
extern int iax_unregister(struct iax_session *session, const char *hostname, const char *peer, const char *secret, const char *reason);
extern int iax_lag_request(struct iax_session *session);
extern int iax_dial(struct iax_session *session, char *number); /* Dial on a TBD call */
extern int iax_dialplan_request(struct iax_session *session, char *number); /* Request dialplan status for number */
extern int iax_quelch(struct iax_session *session);
extern int iax_unquelch(struct iax_session * session);
extern int iax_transfer(struct iax_session *session, const char *number);
extern int iax_quelch_moh(struct iax_session *session, int MOH);
extern int iax_send_video(struct iax_session *session, int format, unsigned char *data, int datalen, int fullframe);
extern int iax_send_video_trunk(struct iax_session *session, int format, char *data, int datalen, int fullframe, int ntrunk);

extern void iax_destroy(struct iax_session  * session);

extern void iax_enable_debug(void);
extern void iax_disable_debug(void);

/* For attended transfer, application create a new session,
 * make a call on the new session.
 * On answer of the new session, call iax_setup_transfer and wait for
 * IAX_EVENT_TXREADY when both sides are completed succefully or
 * IAX_EVENT_TXREJECT for either side.
 * If there are music on hold the it will be stopped by this library.
 */
extern int iax_setup_transfer(struct iax_session *s0, struct iax_session *s1);

struct iax_netstat {
	int jitter;
	int losspct;
	int losscnt;
	int packets;
	int delay;
	int dropped;
	int ooo;
};
/* fills in rtt, and an iax_netstat structure for each of local/remote directions of call */
extern int iax_get_netstats(struct iax_session *s, int *rtt, struct iax_netstat *local, struct iax_netstat *remote);


extern void iax_set_private(struct iax_session *s, void *pvt);
extern void *iax_get_private(struct iax_session *s);
extern void iax_set_sendto(struct iax_session *s, iax_sendto_t sendto);

/* to use application networking instead of internal, set call this instead of iax_init,
 * and pass in sendto and recvfrom replacements.  blocking reads may not be implemented */
extern void iax_set_networking(iax_sendto_t st, iax_recvfrom_t rf);

/* destroy an iax session */
extern void iax_session_destroy(struct iax_session **session);

/* To control use of jitter buffer for video event */
int iax_video_bypass_jitter(struct iax_session*, int );

/* Handle externally received frames */
struct iax_event *iax_net_process(unsigned char *buf, int len, struct sockaddr_in *sin);
extern unsigned int iax_session_get_capability(struct iax_session *s);
extern char iax_pref_codec_add(struct iax_session *session, unsigned int format);
extern void iax_pref_codec_del(struct iax_session *session, unsigned int format);
extern int iax_pref_codec_get(struct iax_session *session, unsigned int *array, int len);

/* Fine tune jitterbuffer */
extern void iax_set_jb_target_extra( long value );

/* Portable 'decent' random number generation */
extern void iax_seed_random(void);
extern int iax_random(void);

#if defined(__cplusplus)
}
#endif

#endif /* _ASTERISK_IAX_CLIENT_H */
