v22bis_tx.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/v29rx.h"
#include "spandsp/v22bis.h"
#include "spandsp/private/logging.h"
#include "spandsp/private/v22bis.h"
#include "v22bis_tx_floating_rrc.h"

Defines

#define ms_to_symbols(t)   (((t)*600)/1000)

Functions

int v22bis_tx (v22bis_state_t *s, int16_t amp[], int len)
 Generate a block of V.22bis modem audio samples.
void v22bis_tx_power (v22bis_state_t *s, float power)
 Adjust a V.22bis modem transmit context's output power.
void v22bis_set_get_bit (v22bis_state_t *s, get_bit_func_t get_bit, void *user_data)
 Change the get_bit function associated with a V.22bis modem context.
void v22bis_set_put_bit (v22bis_state_t *s, put_bit_func_t put_bit, void *user_data)
 Change the put_bit function associated with a V.22bis modem context.
void v22bis_set_modem_status_handler (v22bis_state_t *s, modem_tx_status_func_t handler, void *user_data)
 Change the modem status report function associated with a V.22bis modem receive context.
logging_state_tv22bis_get_logging_state (v22bis_state_t *s)
 Get the logging context associated with a V.22bis modem context.
int v22bis_restart (v22bis_state_t *s, int bit_rate)
 Reinitialise an existing V.22bis modem context.
int v22bis_request_retrain (v22bis_state_t *s, int bit_rate)
 Request a retrain for a V.22bis modem context.
int v22bis_remote_loopback (v22bis_state_t *s, int enable)
 Request a loopback 2 for a V.22bis modem context.
int v22bis_current_bit_rate (v22bis_state_t *s)
 Report the current operating bit rate of a V.22bis modem context.
v22bis_state_tv22bis_init (v22bis_state_t *s, int bit_rate, int guard, int caller, get_bit_func_t get_bit, void *get_bit_user_data, put_bit_func_t put_bit, void *put_bit_user_data)
 Initialise a V.22bis modem context.
int v22bis_release (v22bis_state_t *s)
 Release a V.22bis modem receive context.
int v22bis_free (v22bis_state_t *s)
 Free a V.22bis modem receive context.

Variables

const complexf_t v22bis_constellation [16]

Detailed Description


Function Documentation

int v22bis_current_bit_rate ( v22bis_state_t s  ) 

Report the current operating bit rate of a V.22bis modem context.

Report the current operating bit rate of a V.22bis modem context.

Parameters:
s The modem context.

int v22bis_free ( v22bis_state_t s  ) 

Free a V.22bis modem receive context.

Free a V.22bis modem receive context.

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

logging_state_t* v22bis_get_logging_state ( v22bis_state_t s  ) 

Get the logging context associated with a V.22bis modem context.

Get the logging context associated with a V.22bis modem context.

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

v22bis_state_t* v22bis_init ( v22bis_state_t s,
int  bit_rate,
int  guard,
int  caller,
get_bit_func_t  get_bit,
void *  get_bit_user_data,
put_bit_func_t  put_bit,
void *  put_bit_user_data 
)

Initialise a V.22bis modem context.

Initialise a V.22bis modem 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 1200 and 2400.
guard The guard tone option. 0 = none, 1 = 550Hz, 2 = 1800Hz.
caller TRUE if this is the calling modem.
get_bit The callback routine used to get the data to be transmitted.
put_bit The callback routine used to get the data to be transmitted.
user_data An opaque pointer, passed in calls to the get and put routines.
Returns:
A pointer to the modem context, or NULL if there was a problem.

References dds_phase_ratef(), v22bis_restart(), and v22bis_tx_power().

int v22bis_release ( v22bis_state_t s  ) 

Release a V.22bis modem receive context.

Release a V.22bis modem receive context.

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

int v22bis_remote_loopback ( v22bis_state_t s,
int  enable 
)

Request a loopback 2 for a V.22bis modem context.

Request a loopback 2 for a V.22bis modem context.

Parameters:
s The modem context.
enable TRUE to enable loopback, or FALSE to disable it.
Returns:
0 for OK, -1 for request reject.

int v22bis_request_retrain ( v22bis_state_t s,
int  bit_rate 
)

Request a retrain for a V.22bis modem context.

Request a retrain for a V.22bis modem context. A rate change may also be requested.

Parameters:
s The modem context.
bit_rate The bit rate of the modem. Valid values are 1200 and 2400.
Returns:
0 for OK, -1 for request rejected.

References SIG_STATUS_MODEM_RETRAIN_OCCURRED, and span_log().

int v22bis_restart ( v22bis_state_t s,
int  bit_rate 
)

Reinitialise an existing V.22bis modem context.

Reinitialise an existing V.22bis modem context, so it may be reused.

Parameters:
s The modem context.
bit_rate The bit rate of the modem. Valid values are 1200 and 2400.
Returns:
0 for OK, -1 for bad parameter.

References v22bis_rx_restart().

Referenced by v22bis_init(), and v22bis_rx().

void v22bis_set_get_bit ( v22bis_state_t s,
get_bit_func_t  get_bit,
void *  user_data 
)

Change the get_bit function associated with a V.22bis modem context.

Change the get_bit function associated with a V.22bis modem 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 v22bis_set_modem_status_handler ( v22bis_state_t s,
modem_rx_status_func_t  handler,
void *  user_data 
)

Change the modem status report function associated with a V.22bis modem receive context.

Change the modem status report function associated with a V.22bis modem receive context.

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

void v22bis_set_put_bit ( v22bis_state_t s,
put_bit_func_t  put_bit,
void *  user_data 
)

Change the put_bit function associated with a V.22bis modem context.

Change the get_bit function associated with a V.22bis modem context.

Parameters:
s The modem context.
put_bit The callback routine used to process the data received.
user_data An opaque pointer.

int v22bis_tx ( v22bis_state_t s,
int16_t  amp[],
int  len 
)

Generate a block of V.22bis modem audio samples.

Generate a block of V.22bis 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_modf(), complexf_t::im, complexf_t::re, and V22BIS_TX_FILTER_STEPS.

void v22bis_tx_power ( v22bis_state_t s,
float  power 
)

Adjust a V.22bis modem transmit context's output power.

Adjust a V.22bis modem transmit context's power output.

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

References dds_phase_ratef().

Referenced by v22bis_init().


Variable Documentation

const complexf_t v22bis_constellation[16]

Initial value:

{
    { 1.0f,  1.0f},
    { 3.0f,  1.0f},     
    { 1.0f,  3.0f},
    { 3.0f,  3.0f},
    {-1.0f,  1.0f},
    {-1.0f,  3.0f},     
    {-3.0f,  1.0f},
    {-3.0f,  3.0f},
    {-1.0f, -1.0f},
    {-3.0f, -1.0f},     
    {-1.0f, -3.0f},
    {-3.0f, -3.0f},
    { 1.0f, -1.0f},
    { 1.0f, -3.0f},     
    { 3.0f, -1.0f},
    { 3.0f, -3.0f}
}


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