v29tx.c File Reference

#include <stdio.h>
#include <inttypes.h>
#include <stdlib.h>
#include <string.h>
#include <tgmath.h>
#include "spandsp/telephony.h"
#include "spandsp/logging.h"
#include "spandsp/async.h"
#include "spandsp/complex.h"
#include "spandsp/dds.h"
#include "spandsp/power_meter.h"
#include "spandsp/v29tx.h"

Defines
#define	V29_TRAINING_TEP_LEN   480
#define	V29_TRAINING_SEG_1   0
#define	V29_TRAINING_SEG_2   48
#define	V29_TRAINING_SEG_3   (V29_TRAINING_SEG_2 + 128)
#define	V29_TRAINING_SEG_4   (V29_TRAINING_SEG_3 + 384)
#define	V29_TRAINING_END   (V29_TRAINING_SEG_4 + 48)
#define	V29_TRAINING_SHUTDOWN_END   (V29_TRAINING_END + 10)
#define	PULSESHAPER_GAIN   3.3228378059e+00
Functions
int	v29_tx (v29_tx_state_t *s, int16_t *amp, int len)
	Generate a block of V.29 modem audio samples.
void	v29_tx_power (v29_tx_state_t *s, float power)
	Adjust a V.29 modem transmit context's output power.
void	v29_tx_set_get_bit (v29_tx_state_t *s, get_bit_func_t get_bit, void *user_data)
	Change the get_bit function associated with a V.29 modem transmit context.
int	v29_tx_restart (v29_tx_state_t *s, int rate, int tep)
	Reinitialise an existing V.29 modem transmit context.
v29_tx_state_t *	v29_tx_init (v29_tx_state_t *s, int rate, int tep, get_bit_func_t get_bit, void *user_data)
	Initialise a V.29 modem transmit context.
int	v29_tx_release (v29_tx_state_t *s)
	Release a V.29 modem transmit context.

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Detailed Description

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Function Documentation

int v29_tx	(	v29_tx_state_t *	s,
		int16_t *	amp,
		int	len
	)

Generate a block of V.29 modem audio samples.

Generate a block of V.29 modem audio samples.

Parameters:

	s	The modem context.
	amp	The audio sample buffer.
	len	The number of samples to be generated.

Returns:

The number of samples actually generated.

v29_tx_state_t* v29_tx_init	(	v29_tx_state_t *	s,
		int	rate,
		int	tep,
		get_bit_func_t	get_bit,
		void *	user_data
	)

Initialise a V.29 modem transmit context.

Initialise a V.29 modem transmit context. This must be called before the first use of the context, to initialise its contents.

Parameters:

	s	The modem context.
	rate	The bit rate of the modem. Valid values are 4800, 7200 and 9600.
	tep	TRUE is the optional TEP tone is to be transmitted.
	get_bit	The callback routine used to get the data to be transmitted.
	user_data	An opaque pointer.

Returns:

A pointer to the modem context, or NULL if there was a problem.

void v29_tx_power	(	v29_tx_state_t *	s,
		float	power
	)

Adjust a V.29 modem transmit context's output power.

Adjust a V.29 modem transmit context's power output.

Parameters:

	s	The modem context.
	power	The power level, in dBm0

int v29_tx_release

(

v29_tx_state_t *

s

)

Release a V.29 modem transmit context.

Release a V.29 modem transmit context.

Parameters:

s

The modem context.

Returns:

0 for OK

int v29_tx_restart	(	v29_tx_state_t *	s,
		int	rate,
		int	tep
	)

Reinitialise an existing V.29 modem transmit context.

Reinitialise an existing V.29 modem transmit context, so it may be reused.

Parameters:

	s	The modem context.
	rate	The bit rate of the modem. Valid values are 4800, 7200 and 9600.
	tep	TRUE is the optional TEP tone is to be transmitted.

Returns:

0 for OK, -1 for bad parameter

void v29_tx_set_get_bit	(	v29_tx_state_t *	s,
		get_bit_func_t	get_bit,
		void *	user_data
	)

Change the get_bit function associated with a V.29 modem transmit context.

Change the get_bit function associated with a V.29 modem transmit context.

Parameters:

	s	The modem context.
	get_bit	The callback routine used to get the data to be transmitted.
	user_data	An opaque pointer.

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