adsi.c File Reference

#include <inttypes.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include "floating_fudge.h"
#include <assert.h>
#include "spandsp/telephony.h"
#include "spandsp/fast_convert.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"
#include "spandsp/private/logging.h"
#include "spandsp/private/queue.h"
#include "spandsp/private/tone_generate.h"
#include "spandsp/private/async.h"
#include "spandsp/private/fsk.h"
#include "spandsp/private/dtmf.h"
#include "spandsp/private/adsi.h"

Defines
#define	BAUDOT_FIGURE_SHIFT   0x1B
#define	BAUDOT_LETTER_SHIFT   0x1F
Enumerations
enum	{   SOH = 0x01, STX = 0x02, ETX = 0x03, DLE = 0x10,   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_rx_release (adsi_rx_state_t *s)
	Release an ADSI receive context.
int	adsi_rx_free (adsi_rx_state_t *s)
	Free the resources of 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_tx_release (adsi_tx_state_t *s)
	Release an ADSI transmit context.
int	adsi_tx_free (adsi_tx_state_t *s)
	Free the resources of 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.

---

Detailed Description

---

Define Documentation

#define BAUDOT_FIGURE_SHIFT   0x1B

The baudot code to shift from alpha to digits and symbols

#define BAUDOT_LETTER_SHIFT   0x1F

The baudot code to shift from digits and symbols to alpha

---

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.

References CLIP_DTMF_HASH_UNSPECIFIED.

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.

References dtmf_rx().

int adsi_rx_free

(

adsi_rx_state_t *

s

)

Free the resources of an ADSI receive context.

Parameters:

s

The ADSI receive context.

Returns:

0 for OK.

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.

References dtmf_rx_init(), and fsk_rx_init().

int adsi_rx_release

(

adsi_rx_state_t *

s

)

Release an ADSI receive context.

Parameters:

s

The ADSI receive context.

Returns:

0 for OK.

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.

References dtmf_tx().

int adsi_tx_free

(

adsi_tx_state_t *

s

)

Free the resources of an ADSI transmit context.

Parameters:

s

The ADSI transmit context.

Returns:

0 for OK.

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.

References adsi_tx_set_preamble(), and make_tone_gen_descriptor().

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. If the message is invalid (e.g. it is too long), this function will return -1.

References crc_itu16_calc(), and dtmf_tx_put().

int adsi_tx_release

(

adsi_tx_state_t *

s

)

Release an ADSI transmit context.

Parameters:

s

The ADSI transmit context.

Returns:

0 for OK.

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.

Referenced by adsi_tx_init().