v42.c File Reference

#include <stdio.h>
#include <stdlib.h>
#include <inttypes.h>
#include <string.h>
#include <errno.h>
#include "spandsp/telephony.h"
#include "spandsp/logging.h"
#include "spandsp/async.h"
#include "spandsp/hdlc.h"
#include "spandsp/schedule.h"
#include "spandsp/queue.h"
#include "spandsp/v42.h"
#include "spandsp/private/logging.h"
#include "spandsp/private/schedule.h"
#include "spandsp/private/hdlc.h"
#include "spandsp/private/v42.h"

Defines
#define	LAPM_FRAMETYPE_MASK   0x03
#define	LAPM_FRAMETYPE_I   0x00
#define	LAPM_FRAMETYPE_I_ALT   0x02
#define	LAPM_FRAMETYPE_S   0x01
#define	LAPM_FRAMETYPE_U   0x03
#define	T_WAIT_MIN   2000
#define	T_WAIT_MAX   10000
#define	T_400   750000
#define	T_401   1000000
#define	T_402   1000000
#define	T_403   10000000
#define	N_400   3
#define	N_401   128
#define	LAPM_DLCI_DTE_TO_DTE   0
#define	LAPM_DLCI_LAYER2_MANAGEMENT   63
Functions
void	lapm_reset (lapm_state_t *s)
void	lapm_restart (lapm_state_t *s)
const char *	lapm_status_to_str (int status)
int	lapm_tx (lapm_state_t *s, const void *buf, int len)
int	lapm_release (lapm_state_t *s)
int	lapm_loopback (lapm_state_t *s, int enable)
int	lapm_break (lapm_state_t *s, int enable)
int	lapm_tx_iframe (lapm_state_t *s, const void *buf, int len, int cr)
void	lapm_dump (lapm_state_t *s, const uint8_t *frame, int len, int showraw, int txrx)
void	lapm_receive (void *user_data, const uint8_t *frame, int len, int ok)
void	v42_rx_bit (void *user_data, int bit)
int	v42_tx_bit (void *user_data)
void	v42_set_status_callback (v42_state_t *s, v42_status_func_t callback, void *user_data)
void	v42_restart (v42_state_t *s)
v42_state_t *	v42_init (v42_state_t *s, int calling_party, int detect, v42_frame_handler_t frame_handler, void *user_data)
int	v42_release (v42_state_t *s)
int	v42_free (v42_state_t *s)

---

Detailed Description

---

Function Documentation

int lapm_break	(	lapm_state_t *	s,
		int	enable
	)

Send a break over a LAP.M connection

void lapm_dump	(	lapm_state_t *	s,
		const uint8_t *	frame,
		int	len,
		int	showraw,
		int	txrx
	)

Dump LAP.M frames in a raw and/or decoded forms

Parameters:

frame	The frame itself
len	The length of the frame, in octets
showraw	TRUE if the raw octets should be dumped
txrx	TRUE if tx, FALSE if rx. Used to highlight the packet's direction.

References span_log(), and span_log_buf().

int lapm_loopback	(	lapm_state_t *	s,
		int	enable
	)

Enable or disable loopback of a LAP.M connection

int lapm_release

(

lapm_state_t *

s

)

Initiate an orderly release of a LAP.M connection

int lapm_tx	(	lapm_state_t *	s,
		const void *	buf,
		int	len
	)

Transmit a LAP.M frame

References queue_write().

int lapm_tx_iframe	(	lapm_state_t *	s,
		const void *	buf,
		int	len,
		int	cr
	)

Transmit a LAP.M information frame

References span_log().

int v42_free

(

v42_state_t *

s

)

Free a V.42 context.

Parameters:

s	The V.42 context.

Returns:

0 if OK

v42_state_t* v42_init	(	v42_state_t *	s,
		int	calling_party,
		int	detect,
		v42_frame_handler_t	frame_handler,
		void *	user_data
	)

Initialise a V.42 context.

Parameters:

s	The V.42 context.
calling_party	TRUE if caller mode, else answerer mode.
frame_handler	A callback function to handle received frames of data.
user_data	An opaque pointer passed to the frame handler routine.

Returns:

???

References queue_init(), and v42_restart().

int v42_release

(

v42_state_t *

s

)

Release a V.42 context.

Parameters:

s	The V.42 context.

Returns:

0 if OK

void v42_restart

(

v42_state_t *

s

)

Restart a V.42 context.

Parameters:

s	The V.42 context.

Referenced by v42_init().

void v42_rx_bit	(	void *	user_data,
		int	bit
	)

Process a newly received bit for a V.42 context.

References v42_state_s::lapm.

void v42_set_status_callback	(	v42_state_t *	s,
		v42_status_func_t	callback,
		void *	user_data
	)

Assign or remove a callback routine used to deal with V.42 status changes.

int v42_tx_bit

(

void *

user_data

)

Get the next transmit bit for a V.42 context.

References v42_state_s::lapm.