spandsp 0.0.6
silence_gen.c File Reference
#include <inttypes.h>
#include <stdlib.h>
#include <stdio.h>
#include <fcntl.h>
#include <string.h>
#include "floating_fudge.h"
#include <assert.h>
#include <limits.h>
#include "spandsp/telephony.h"
#include "spandsp/logging.h"
#include "spandsp/async.h"
#include "spandsp/silence_gen.h"
#include "spandsp/private/silence_gen.h"

Functions

int silence_gen (silence_gen_state_t *s, int16_t *amp, int max_len)
 
void silence_gen_always (silence_gen_state_t *s)
 Set a silence generator context to output continuous silence. More...
 
void silence_gen_set (silence_gen_state_t *s, int silent_samples)
 Set a silence generator context to output a specified period of silence. More...
 
void silence_gen_alter (silence_gen_state_t *s, int silent_samples)
 Alter the period of a silence generator context by a specified amount. More...
 
int silence_gen_remainder (silence_gen_state_t *s)
 Find how long a silence generator context has to run. More...
 
int silence_gen_generated (silence_gen_state_t *s)
 Find the total silence generated to date. More...
 
void silence_gen_status_handler (silence_gen_state_t *s, modem_status_func_t handler, void *user_data)
 Change the status reporting function associated with a silence generator context. More...
 
silence_gen_state_tsilence_gen_init (silence_gen_state_t *s, int silent_samples)
 Initialise a timed silence generator context. More...
 
int silence_gen_release (silence_gen_state_t *s)
 
int silence_gen_free (silence_gen_state_t *s)
 
int span_dummy_rx (void *user_data, const int16_t amp[], int len)
 
int span_dummy_mod (void *user_data, int16_t amp[], int len)
 Dummy signal modifier callback. More...
 
int span_dummy_rx_fillin (void *user_data, int len)
 

Function Documentation

◆ silence_gen_alter()

void silence_gen_alter ( silence_gen_state_t s,
int  silent_samples 
)

Alter the period of a silence generator context by a specified amount.

Alter the period of a silence generator context by a specified amount.

Parameters
sThe silence generator context.
silent_samplesThe number of samples to change the setting by. A positive number increases the duration. A negative number reduces it. The duration is prevented from going negative.

◆ silence_gen_always()

void silence_gen_always ( silence_gen_state_t s)

Set a silence generator context to output continuous silence.

Set a silence generator context to output continuous silence.

Parameters
sThe silence generator context.

◆ silence_gen_generated()

int silence_gen_generated ( silence_gen_state_t s)

Find the total silence generated to date.

Find the total silence generated to date by a silence generator context.

Parameters
sThe silence generator context.
Returns
The number of samples generated.

◆ silence_gen_init()

silence_gen_state_t * silence_gen_init ( silence_gen_state_t s,
int  silent_samples 
)

Initialise a timed silence generator context.

Initialise a timed silence generator context.

Parameters
sThe silence generator context.
silent_samplesThe initial number of samples to set the silence to.
Returns
A pointer to the silence generator context.

◆ silence_gen_remainder()

int silence_gen_remainder ( silence_gen_state_t s)

Find how long a silence generator context has to run.

Find how long a silence generator context has to run.

Parameters
sThe silence generator context.
Returns
The number of samples remaining.

◆ silence_gen_set()

void silence_gen_set ( silence_gen_state_t s,
int  silent_samples 
)

Set a silence generator context to output a specified period of silence.

Set a silence generator context to output a specified period of silence.

Parameters
sThe silence generator context.
silent_samplesThe number of samples to be generated.

◆ silence_gen_status_handler()

void silence_gen_status_handler ( silence_gen_state_t s,
modem_status_func_t  handler,
void *  user_data 
)

Change the status reporting function associated with a silence generator context.

Change the status reporting function associated with a silence generator context.

Parameters
sThe silence generator context.
handlerThe callback routine used to report status changes.
user_dataAn opaque pointer.

References silence_gen_state_s::status_handler, and silence_gen_state_s::status_user_data.

◆ span_dummy_mod()

int span_dummy_mod ( void *  user_data,
int16_t  amp[],
int  len 
)

Dummy signal modifier callback.

A dummy routine to use as a signal modifier callback, when we aren't really trying to process the signal. It just returns without affecting anything.

Parameters
user_dataThe context.
ampThe signal.buffer
lenThe length of the signal buffer
Returns
0.