v42.c File Reference

#include <stdio.h>
#include <stdlib.h>
#include <inttypes.h>
#include <string.h>
#include <unistd.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"

Defines

#define FALSE   0
#define TRUE   (!FALSE)
#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   750
#define T_401   1000
#define T_403   10000
#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)
int lapm_tx (lapm_state_t *s, const void *buf, int len)
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, int ok, const uint8_t *frame, int len)
void lapm_hdlc_underflow (void *user_data)
void lapm_init (lapm_state_t *s)
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)
void v42_init (v42_state_t *s, int caller, int detect, v42_frame_handler_t frame_handler, void *user_data)
int v42_release (v42_state_t *s)

Detailed Description


Function Documentation

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.

void lapm_receive ( void *  user_data,
int  ok,
const uint8_t *  buf,
int  len 
)

Accept an HDLC packet

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

Transmit a LAP.M frame

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

Transmit a LAP.M information frame

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

Initialise a V.42 context.

Parameters:
s The V.42 context.
caller 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.

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.

void v42_rx_bit ( void *  user_data,
int  bit 
)

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

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.


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