t31.c File Reference

#include <inttypes.h>
#include <stdlib.h>
#include <unistd.h>
#include <stdio.h>
#include <fcntl.h>
#include <memory.h>
#include <strings.h>
#include <ctype.h>
#include <math.h>
#include <assert.h>
#include "spandsp/telephony.h"
#include "spandsp/logging.h"
#include "spandsp/queue.h"
#include "spandsp/power_meter.h"
#include "spandsp/complex.h"
#include "spandsp/tone_generate.h"
#include "spandsp/async.h"
#include "spandsp/hdlc.h"
#include "spandsp/fsk.h"
#include "spandsp/v29rx.h"
#include "spandsp/v29tx.h"
#include "spandsp/v27ter_rx.h"
#include "spandsp/v27ter_tx.h"
#include "spandsp/t31.h"

Classes
struct	at_cmd_item_t
Defines
#define	ms_to_samples(t)   (((t)*SAMPLE_RATE)/1000)
#define	ETX   0x03
#define	DLE   0x10
#define	SUB   0x1A
Typedefs
typedef const char *(*)	at_cmd_service_t (t31_state_t *s, const char *cmd)
Enumerations
enum	{ ASCII_RESULT_CODES = 1, NUMERIC_RESULT_CODES, NO_RESULT_CODES }
enum	{   T31_SILENCE, T31_CED_TONE, T31_CNG_TONE, T31_V21_TX,   T31_V17_TX, T31_V27TER_TX, T31_V29_TX, T31_V21_RX,   T31_V17_RX, T31_V27TER_RX, T31_V29_RX }
enum	{   RESPONSE_CODE_OK = 0, RESPONSE_CODE_CONNECT, RESPONSE_CODE_RING, RESPONSE_CODE_NO_CARRIER,   RESPONSE_CODE_ERROR, RESPONSE_CODE_XXX, RESPONSE_CODE_NO_DIALTONE, RESPONSE_CODE_BUSY,   RESPONSE_CODE_NO_ANSWER, RESPONSE_CODE_FCERROR, RESPONSE_CODE_FRH3 }
Functions
void	t31_v21_rx (t31_state_t *s)
const char *	s_reg_handler (t31_state_t *s, const char *t, int reg)
void	t31_call_event (t31_state_t *s, int event)
int	t31_at_rx (t31_state_t *s, const char *t, int len)
int	t31_rx (t31_state_t *s, int16_t *buf, int len)
	Process a block of received T.31 modem audio samples.
int	t31_tx (t31_state_t *s, int16_t *buf, int max_len)
	Generate a block of T.31 modem audio samples.
int	t31_init (t31_state_t *s, t31_at_tx_handler_t *at_tx_handler, void *at_tx_user_data, t31_modem_control_handler_t *modem_control_handler, void *modem_control_user_data)
	Initialise a T.31 context.
Variables
t31_profile_t	profiles [3]
const char *	response_codes []
at_cmd_item_t	at_commands []

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Detailed Description

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Function Documentation

int t31_init	(	t31_state_t *	s,
		t31_at_tx_handler_t *	at_tx_handler,
		void *	at_tx_user_data,
		t31_modem_control_handler_t *	modem_control_handler,
		void *	modem_control_user_data
	)

Initialise a T.31 context.

Initialise a T.31 context. This must be called before the first use of the context, to initialise its contents.

Parameters:

	s	The T.31 context.
	at_tx_handler	???.
	at_tx_user_data	???.
	modem_control_handler	???.
	modem_control_user_data	???.

Returns:

???.

int t31_rx	(	t31_state_t *	s,
		int16_t *	buf,
		int	len
	)

Process a block of received T.31 modem audio samples.

Process a block of received T.31 modem audio samples.

Parameters:

	s	The T.31 modem context.
	amp	The audio sample buffer.
	len	The number of samples in the buffer.

Returns:

The number of samples unprocessed.

int t31_tx	(	t31_state_t *	s,
		int16_t *	buf,
		int	max_len
	)

Generate a block of T.31 modem audio samples.

Generate a block of T.31 modem audio samples.

Parameters:

	s	The T.31 modem context.
	amp	The audio sample buffer.
	max_len	The number of samples to be generated.

Returns:

The number of samples actually generated.

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Variable Documentation

t31_profile_t profiles[3]

Initial value:

{
    {
        .echo = TRUE,
        .verbose = TRUE,
        .result_code_format = ASCII_RESULT_CODES,
        .pulse_dial = FALSE,
        .double_escape = FALSE,
        .adaptive_receive = FALSE,
        .s_regs[0] = 0,
        .s_regs[3] = '\r',
        .s_regs[4] = '\n',
        .s_regs[5] = '\b',
        .s_regs[6] = 1,
        .s_regs[7] = 60,
        .s_regs[8] = 5,
        .s_regs[10] = 0
    }
}

const char* response_codes[]

Initial value:

{
    "OK",
    "CONNECT",
    "RING",
    "NO CARRIER",
    "ERROR",
    "???",
    "NO DIALTONE",
    "BUSY",
    "NO ANSWER",
    "+FCERROR",
    "+FRH:3"
}

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