v29tx.c File Reference

#include <stdio.h>
#include <inttypes.h>
#include <stdlib.h>
#include <string.h>
#include "floating_fudge.h"
#include "spandsp/telephony.h"
#include "spandsp/fast_convert.h"
#include "spandsp/logging.h"
#include "spandsp/complex.h"
#include "spandsp/vector_float.h"
#include "spandsp/complex_vector_float.h"
#include "spandsp/async.h"
#include "spandsp/dds.h"
#include "spandsp/power_meter.h"
#include "spandsp/v29tx.h"
#include "spandsp/private/logging.h"
#include "spandsp/private/v29tx.h"
#include "v29tx_constellation_maps.h"
#include "v29tx_floating_rrc.h"

Defines

#define CARRIER_NOMINAL_FREQ   1700.0f
#define V29_TRAINING_SEG_TEP   0
#define V29_TRAINING_SEG_1   (V29_TRAINING_SEG_TEP + 480)
#define V29_TRAINING_SEG_2   (V29_TRAINING_SEG_1 + 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 + 32)

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.
void v29_tx_set_modem_status_handler (v29_tx_state_t *s, modem_tx_status_func_t handler, void *user_data)
 Change the modem status report function associated with a V.29 modem transmit context.
logging_state_tv29_tx_get_logging_state (v29_tx_state_t *s)
 Get the logging context associated with a V.29 modem transmit context.
int v29_tx_restart (v29_tx_state_t *s, int bit_rate, int tep)
 Reinitialise an existing V.29 modem transmit context.
v29_tx_state_tv29_tx_init (v29_tx_state_t *s, int bit_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.
int v29_tx_free (v29_tx_state_t *s)
 Free a V.29 modem transmit context.

Detailed Description


Define Documentation

#define CARRIER_NOMINAL_FREQ   1700.0f

The nominal frequency of the carrier, in Hertz

#define V29_TRAINING_END   (V29_TRAINING_SEG_4 + 48)

The end of the training, in symbols

#define V29_TRAINING_SEG_1   (V29_TRAINING_SEG_TEP + 480)

The start of training segment 1, in symbols

Referenced by v29_tx_restart().

#define V29_TRAINING_SEG_2   (V29_TRAINING_SEG_1 + 48)

The start of training segment 2, in symbols

#define V29_TRAINING_SEG_3   (V29_TRAINING_SEG_2 + 128)

The start of training segment 3, in symbols

#define V29_TRAINING_SEG_4   (V29_TRAINING_SEG_3 + 384)

The start of training segment 4, in symbols

#define V29_TRAINING_SEG_TEP   0

The start of the optional TEP, that may preceed the actual training, in symbols

Referenced by v29_tx_restart().

#define V29_TRAINING_SHUTDOWN_END   (V29_TRAINING_END + 32)

The end of the shutdown sequence, in symbols

Referenced by v29_tx().


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.

References dds_complexf(), dds_complexi(), complexf_t::im, complexf_t::re, V29_TRAINING_SHUTDOWN_END, and V29_TX_FILTER_STEPS.

int v29_tx_free ( v29_tx_state_t s  ) 

Free a V.29 modem transmit context.

Free a V.29 modem transmit context.

Parameters:
s The modem context.
Returns:
0 for OK

logging_state_t* v29_tx_get_logging_state ( v29_tx_state_t s  ) 

Get the logging context associated with a V.29 modem transmit context.

Get the logging context associated with a V.29 modem transmit context.

Parameters:
s The modem context.
Returns:
A pointer to the logging context

v29_tx_state_t* v29_tx_init ( v29_tx_state_t s,
int  bit_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.
bit_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.

References CARRIER_NOMINAL_FREQ, dds_phase_ratef(), v29_tx_power(), and v29_tx_restart().

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

Referenced by v29_tx_init().

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  bit_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.
bit_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

References span_log(), V29_TRAINING_SEG_1, and V29_TRAINING_SEG_TEP.

Referenced by v29_tx_init().

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.

void v29_tx_set_modem_status_handler ( v29_tx_state_t s,
modem_tx_status_func_t  handler,
void *  user_data 
)

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

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

Parameters:
s The modem context.
handler The callback routine used to report modem status changes.
user_data An opaque pointer.


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