sig_tone.c File Reference
`#include <stdlib.h>`
`#include <inttypes.h>`
`#include "floating_fudge.h"`
`#include <memory.h>`
`#include <string.h>`
`#include <limits.h>`
`#include "spandsp/telephony.h"`
`#include "spandsp/fast_convert.h"`
`#include "spandsp/dc_restore.h"`
`#include "spandsp/saturated.h"`
`#include "spandsp/vector_int.h"`
`#include "spandsp/complex.h"`
`#include "spandsp/power_meter.h"`
`#include "spandsp/dds.h"`
`#include "spandsp/super_tone_rx.h"`
`#include "spandsp/sig_tone.h"`
`#include "spandsp/private/sig_tone.h"`

## Macros

#define | PI 3.14159265358979323

## Enumerations

enum | { NOTCH_COEFF_SET_2280HZ = 0 , NOTCH_COEFF_SET_2400HZ , NOTCH_COEFF_SET_2600HZ }

## Functions

int | sig_tone_tx (sig_tone_tx_state_t *s, int16_t amp[], int len)
| Generate a block of signalling tone audio samples.
void | sig_tone_tx_set_mode (sig_tone_tx_state_t *s, int mode, int duration)
| Set the tone mode.
sig_tone_tx_state_t * | sig_tone_tx_init (sig_tone_tx_state_t *s, int tone_type, tone_report_func_t sig_update, void *user_data)
| Initialise a signalling tone context.
int | sig_tone_tx_release (sig_tone_tx_state_t *s)
| Release a signalling tone transmitter context.
int | sig_tone_tx_free (sig_tone_tx_state_t *s)
| Free a signalling tone transmitter context.
int | sig_tone_rx (sig_tone_rx_state_t *s, int16_t amp[], int len)
| Process a block of received audio samples.
void | sig_tone_rx_set_mode (sig_tone_rx_state_t *s, int mode, int duration)
| Set the receive mode.
sig_tone_rx_state_t * | sig_tone_rx_init (sig_tone_rx_state_t *s, int tone_type, tone_report_func_t sig_update, void *user_data)
| Initialise a signalling tone context.
int | sig_tone_rx_release (sig_tone_rx_state_t *s)
| Release a signalling tone receiver context.
int | sig_tone_rx_free (sig_tone_rx_state_t *s)
| Free a signalling tone receiver context.

## Variables

int | nnn = 0

## Macro Definition Documentation

## PI

#define PI 3.14159265358979323

PI

## Function Documentation

## sig_tone_rx()

int sig_tone_rx | ( | sig_tone_rx_state_t * | s,
|  | int16_t | amp[],
|  | int | len )

Process a block of received audio samples.

Process a block of received audio samples.

Parameters

  s | The signalling tone context.
  amp | The audio sample buffer.
  len | The number of samples in the buffer.

Returns
  The number of samples unprocessed.

References sig_tone_flat_coeffs_t::a, sig_tone_flat_coeffs_t::b, sig_tone_rx_state_s::current_notch_filter, sig_tone_rx_state_s::current_rx_tone, sig_tone_rx_state_s::desc, sig_tone_rx_state_s::detection_ratio, sig_tone_descriptor_t::flat, sig_tone_rx_state_s::flat_detection_threshold, sig_tone_rx_state_s::flat_mode, sig_tone_rx_state_s::flat_mode_timeout, sig_tone_rx_state_s::flat_power, sig_tone_rx_state_s::flat_z, sig_tone_rx_state_s::last_sample_tone_present, sig_tone_descriptor_t::notch, sig_tone_rx_state_s::notch_insertion_timeout, sig_tone_descriptor_t::notch_lag_time, sig_tone_rx_state_s::notch_z1, sig_tone_rx_state_s::notch_z2, sig_tone_rx_state_s::power, power_meter_update(), sig_tone_rx_state_s::sharp_detection_threshold, sig_tone_descriptor_t::sharp_flat_timeout, SIG_TONE_1_CHANGE, SIG_TONE_1_PRESENT, SIG_TONE_2_CHANGE, SIG_TONE_2_PRESENT, SIG_TONE_RX_FILTER_TONE, SIG_TONE_RX_PASSTHROUGH, sig_tone_rx_state_s::sig_update, sig_tone_rx_state_s::signalling_state, sig_tone_rx_state_s::signalling_state_duration, sig_tone_descriptor_t::tone_off_check_time, sig_tone_descriptor_t::tone_on_check_time, sig_tone_rx_state_s::tone_persistence_timeout, sig_tone_descriptor_t::tones, and sig_tone_rx_state_s::user_data.

## sig_tone_rx_free()

int sig_tone_rx_free | ( | sig_tone_rx_state_t * | s | ) |

Free a signalling tone receiver context.

Free a signalling tone receiver context.

Parameters

  s | The signalling tone context.

Returns
  0 for OK

## sig_tone_rx_init()

sig_tone_rx_state_t * sig_tone_rx_init | ( | sig_tone_rx_state_t * | s,
|  | int | tone_type,
|  | tone_report_func_t | sig_update,
|  | void * | user_data )

Initialise a signalling tone context.

Initialise a signalling tone receiver context.

Parameters

  s | The signalling tone context.
  tone_type | The type of signalling tone.
  sig_update | Callback function to handle signalling updates.
  user_data | An opaque pointer.

Returns
  A pointer to the signalling tone context, or NULL if there was a problem.

References sig_tone_rx_state_s::desc, sig_tone_descriptor_t::detection_ratio, sig_tone_rx_state_s::detection_ratio, sig_tone_descriptor_t::flat_detection_threshold, sig_tone_rx_state_s::flat_detection_threshold, sig_tone_rx_state_s::flat_power, sig_tone_rx_state_s::flat_z, sig_tone_rx_state_s::last_sample_tone_present, sig_tone_rx_state_s::notch_z1, sig_tone_rx_state_s::notch_z2, sig_tone_rx_state_s::power, power_meter_init(), power_meter_level_dbm0(), sig_tone_descriptor_t::sharp_detection_threshold, sig_tone_rx_state_s::sharp_detection_threshold, sig_tone_rx_state_s::sig_update, and sig_tone_rx_state_s::user_data.

## sig_tone_rx_release()

int sig_tone_rx_release | ( | sig_tone_rx_state_t * | s | ) |

Release a signalling tone receiver context.

Release a signalling tone receiver context.

Parameters

  s | The signalling tone context.

Returns
  0 for OK

## sig_tone_rx_set_mode()

void sig_tone_rx_set_mode | ( | sig_tone_rx_state_t * | s,
|  | int | mode,
|  | int | duration )

Set the receive mode.

Set the receive mode.

Parameters

  s | The signalling tone context.
  mode | The new mode for the receiver.
  duration | The duration for this mode, before an update is requested. A duration of zero means forever.

References sig_tone_rx_state_s::current_rx_tone.

## sig_tone_tx()

int sig_tone_tx | ( | sig_tone_tx_state_t * | s,
|  | int16_t | amp[],
|  | int | len )

Generate a block of signalling tone audio samples.

Generate a block of signalling tone audio samples.

Parameters

  s | The signalling tone context.
  amp | The audio sample buffer.
  len | The number of samples to be generated.

Returns
  The number of samples actually generated.

References sig_tone_tx_state_s::current_tx_timeout, sig_tone_tx_state_s::current_tx_tone, dds_mod(), sig_tone_tx_state_s::desc, sig_tone_tx_state_s::high_low_timer, sig_tone_tx_state_s::phase_acc, sig_tone_tx_state_s::phase_rate, SIG_TONE_1_PRESENT, SIG_TONE_2_PRESENT, SIG_TONE_TX_PASSTHROUGH, SIG_TONE_TX_UPDATE_REQUEST, sig_tone_tx_state_s::sig_update, sig_tone_tx_state_s::tone_scaling, sig_tone_descriptor_t::tones, and sig_tone_tx_state_s::user_data.

## sig_tone_tx_free()

int sig_tone_tx_free | ( | sig_tone_tx_state_t * | s | ) |

Free a signalling tone transmitter context.

Free a signalling tone transmitter context.

Parameters

  s | The signalling tone context.

Returns
  0 for OK

## sig_tone_tx_init()

sig_tone_tx_state_t * sig_tone_tx_init | ( | sig_tone_tx_state_t * | s,
|  | int | tone_type,
|  | tone_report_func_t | sig_update,
|  | void * | user_data )

Initialise a signalling tone context.

Initialise a signalling tone transmitter context.

Parameters

  s | The signalling tone context.
  tone_type | The type of signalling tone.
  sig_update | Callback function to handle signalling updates.
  user_data | An opaque pointer.

Returns
  A pointer to the signalling tone context, or NULL if there was a problem.

References dds_phase_rate(), dds_scaling_dbm0(), sig_tone_tx_state_s::desc, sig_tone_tx_state_s::phase_rate, sig_tone_tx_state_s::sig_update, sig_tone_descriptor_t::tone_amp, sig_tone_descriptor_t::tone_freq, sig_tone_tx_state_s::tone_scaling, and sig_tone_tx_state_s::user_data.

## sig_tone_tx_release()

int sig_tone_tx_release | ( | sig_tone_tx_state_t * | s | ) |

Release a signalling tone transmitter context.

Release a signalling tone transmitter context.

Parameters

  s | The signalling tone context.

Returns
  0 for OK

## sig_tone_tx_set_mode()

void sig_tone_tx_set_mode | ( | sig_tone_tx_state_t * | s,
|  | int | mode,
|  | int | duration )

Set the tone mode.

Set the tone mode.

Parameters

  s | The signalling tone context.
  mode | The new mode for the transmitted tones.
  duration | The duration for this mode, before an update is requested. A duration of zero means forever.

References sig_tone_tx_state_s::current_tx_timeout, sig_tone_tx_state_s::current_tx_tone, sig_tone_tx_state_s::desc, sig_tone_descriptor_t::high_low_timeout, sig_tone_tx_state_s::high_low_timer, sig_tone_tx_state_s::phase_acc, SIG_TONE_1_PRESENT, and SIG_TONE_2_PRESENT.