adsi.c File Reference

#include <inttypes.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <assert.h>
#include "spandsp/telephony.h"
#include "spandsp/logging.h"
#include "spandsp/queue.h"
#include "spandsp/complex.h"
#include "spandsp/dds.h"
#include "spandsp/power_meter.h"
#include "spandsp/async.h"
#include "spandsp/crc.h"
#include "spandsp/fsk.h"
#include "spandsp/tone_detect.h"
#include "spandsp/tone_generate.h"
#include "spandsp/super_tone_rx.h"
#include "spandsp/dtmf.h"
#include "spandsp/adsi.h"

Defines
#define	BAUDOT_FIGURE_SHIFT   0x1B
#define	BAUDOT_LETTER_SHIFT   0x1F
#define	SOH   0x01
#define	STX   0x02
#define	ETX   0x03
#define	DLE   0x10
#define	SUB   0x1A
Functions
int	adsi_rx (adsi_rx_state_t *s, const int16_t *amp, int len)
	Receive a chunk of ADSI audio.
adsi_rx_state_t *	adsi_rx_init (adsi_rx_state_t *s, int standard, put_msg_func_t put_msg, void *user_data)
	Initialise an ADSI receive context.
int	adsi_tx (adsi_tx_state_t *s, int16_t *amp, int max_len)
	Generate a block of ADSI audio samples.
void	adsi_tx_send_alert_tone (adsi_tx_state_t *s)
	Request generation of an ADSI alert tone.
void	adsi_tx_set_preamble (adsi_tx_state_t *s, int preamble_len, int preamble_ones_len, int postamble_ones_len, int stop_bits)
	Adjust the preamble associated with an ADSI transmit context.
int	adsi_tx_put_message (adsi_tx_state_t *s, const uint8_t *msg, int len)
	Put a message into the input buffer of an ADSI transmit context.
adsi_tx_state_t *	adsi_tx_init (adsi_tx_state_t *s, int standard)
	Initialise an ADSI transmit context.
int	adsi_next_field (adsi_rx_state_t *s, const uint8_t *msg, int msg_len, int pos, uint8_t *field_type, uint8_t const **field_body, int *field_len)
	Get a field from an ADSI message.
int	adsi_add_field (adsi_tx_state_t *s, uint8_t *msg, int len, uint8_t field_type, uint8_t const *field_body, int field_len)
	Insert the header or a field into an ADSI message.
const char *	adsi_standard_to_str (int standard)
	Return a short name for an ADSI standard.

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Detailed Description

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Function Documentation

int adsi_add_field (  adsi_tx_state_t *  s, uint8_t *  msg, int  len, uint8_t  field_type, uint8_t const *  field_body, int  field_len )

Insert the header or a field into an ADSI message. Parameters: s  The ADSI transmit context. msg  The message buffer. len  The current length of the message. field_type  The type code for the new field. field_body  Pointer to the body of the new field. field_len  The length of the new field.

int adsi_next_field (  adsi_rx_state_t *  s, const uint8_t *  msg, int  msg_len, int  pos, uint8_t *  field_type, uint8_t const **  field_body, int *  field_len )

Get a field from an ADSI message. Parameters: s  The ADSI receive context. msg  The message buffer. msg_len  The length of the message. pos  Current position within the message. Set to -1 when starting a message. field_type  The type code for the field. field_body  Pointer to the body of the field. field_len  The length of the field, or -1 for no more fields, or -2 for message structure corrupt.

int adsi_rx (  adsi_rx_state_t *  s, const int16_t *  amp, int  len )

Receive a chunk of ADSI audio. Parameters: s  The ADSI receive context. amp  The audio sample buffer. len  The number of samples in the buffer. Returns: The number of samples unprocessed.

adsi_rx_state_t* adsi_rx_init (  adsi_rx_state_t *  s, int  standard, put_msg_func_t  put_msg, void *  user_data )

Initialise an ADSI receive context. Parameters: s  The ADSI receive context. standard  The code for the ADSI standard to be used. put_msg  A callback routine called to deliver the received messages to the application. user_data  An opaque pointer for the callback routine. Returns: A pointer to the initialised context, or NULL if there was a problem.

const char* adsi_standard_to_str (  int  standard  )

Return a short name for an ADSI standard. Parameters: standard  The code for the standard. Returns: A pointer to the name.

int adsi_tx (  adsi_tx_state_t *  s, int16_t *  amp, int  max_len )

Generate a block of ADSI audio samples. Parameters: s  The ADSI transmit context. amp  The audio sample buffer. max_len  The number of samples to be generated. Returns: The number of samples actually generated.

adsi_tx_state_t* adsi_tx_init (  adsi_tx_state_t *  s, int  standard )

Initialise an ADSI transmit context. Parameters: s  The ADSI transmit context. standard  The code for the ADSI standard to be used. Returns: A pointer to the initialised context, or NULL if there was a problem.

int adsi_tx_put_message (  adsi_tx_state_t *  s, const uint8_t *  msg, int  len )

Put a message into the input buffer of an ADSI transmit context. Parameters: s  The ADSI transmit context. msg  The message. len  The length of the message. Returns: The length actually added. If a message is already in progress in the transmitter, this function will return zero, as it will not successfully add the message to the buffer.

void adsi_tx_send_alert_tone (  adsi_tx_state_t *  s  )

Request generation of an ADSI alert tone. Parameters: s  The ADSI transmit context.

void adsi_tx_set_preamble (  adsi_tx_state_t *  s, int  preamble_len, int  preamble_ones_len, int  postamble_ones_len, int  stop_bits )

Adjust the preamble associated with an ADSI transmit context. Parameters: s  The ADSI transmit context. preamble_len  The number of bits of preamble. preamble_ones_len  The number of bits of continuous one before a message. postamble_ones_len  The number of bits of continuous one after a message. stop_bits  The number of stop bits per character.

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