modem_connect_tones.c File Reference

#include <inttypes.h>
#include <stdlib.h>
#include <memory.h>
#include <tgmath.h>
#include <math.h>
#include "floating_fudge.h"
#include <stdio.h>
#include "spandsp/telephony.h"
#include "spandsp/fast_convert.h"
#include "spandsp/logging.h"
#include "spandsp/complex.h"
#include "spandsp/dds.h"
#include "spandsp/tone_detect.h"
#include "spandsp/tone_generate.h"
#include "spandsp/super_tone_rx.h"
#include "spandsp/power_meter.h"
#include "spandsp/async.h"
#include "spandsp/fsk.h"
#include "spandsp/modem_connect_tones.h"
#include "spandsp/private/fsk.h"
#include "spandsp/private/modem_connect_tones.h"

Defines

#define HDLC_FRAMING_OK_THRESHOLD   5

Functions

const char * modem_connect_tone_to_str (int tone)
 SPAN_DECLARE_NONSTD (int)
 Get the next bit of a transmitted serial bit stream.
modem_connect_tones_tx_state_tmodem_connect_tones_tx_init (modem_connect_tones_tx_state_t *s, int tone_type)
 Initialise an instance of the modem connect tones generator.
int modem_connect_tones_tx_release (modem_connect_tones_tx_state_t *s)
 Release an instance of the modem connect tones generator.
int modem_connect_tones_tx_free (modem_connect_tones_tx_state_t *s)
 Free an instance of the modem connect tones generator.
int modem_connect_tones_rx_get (modem_connect_tones_rx_state_t *s)
 Test if a modem_connect tone has been detected.
modem_connect_tones_rx_state_tmodem_connect_tones_rx_init (modem_connect_tones_rx_state_t *s, int tone_type, tone_report_func_t tone_callback, void *user_data)
 Initialise an instance of the modem connect tones detector.
int modem_connect_tones_rx_release (modem_connect_tones_rx_state_t *s)
 Release an instance of the modem connect tones detector.
int modem_connect_tones_rx_free (modem_connect_tones_rx_state_t *s)
 Free an instance of the modem connect tones detector.

Detailed Description


Function Documentation

int modem_connect_tones_rx_free ( modem_connect_tones_rx_state_t s  ) 

Free an instance of the modem connect tones detector.

Parameters:
s The context.
Returns:
0 for OK, else -1.
int modem_connect_tones_rx_get ( modem_connect_tones_rx_state_t s  ) 

Test if a modem_connect tone has been detected.

Parameters:
s The context.
Returns:
TRUE if tone is detected, else FALSE.

References MODEM_CONNECT_TONES_NONE.

Referenced by SPAN_DECLARE_NONSTD().

modem_connect_tones_rx_state_t* modem_connect_tones_rx_init ( modem_connect_tones_rx_state_t s,
int  tone_type,
tone_report_func_t  tone_callback,
void *  user_data 
)

Initialise an instance of the modem connect tones detector.

Parameters:
s The context.
tone_type The type of connect tone being tested for.
tone_callback An optional callback routine, used to report tones
user_data An opaque pointer passed to the callback routine,
Returns:
A pointer to the context.

References fsk_rx_init(), fsk_rx_signal_cutoff(), MODEM_CONNECT_TONES_ANS, MODEM_CONNECT_TONES_ANS_PR, MODEM_CONNECT_TONES_ANSAM, MODEM_CONNECT_TONES_ANSAM_PR, MODEM_CONNECT_TONES_FAX_CED_OR_PREAMBLE, MODEM_CONNECT_TONES_FAX_PREAMBLE, and MODEM_CONNECT_TONES_NONE.

int modem_connect_tones_rx_release ( modem_connect_tones_rx_state_t s  ) 

Release an instance of the modem connect tones detector.

Parameters:
s The context.
Returns:
0 for OK, else -1.
int modem_connect_tones_tx_free ( modem_connect_tones_tx_state_t s  ) 

Free an instance of the modem connect tones generator.

Parameters:
s The context.
Returns:
0 for OK, else -1.
modem_connect_tones_tx_state_t* modem_connect_tones_tx_init ( modem_connect_tones_tx_state_t s,
int  tone_type 
)

Initialise an instance of the modem connect tones generator.

Parameters:
s The context.

References dds_phase_rate(), dds_scaling_dbm0(), MODEM_CONNECT_TONES_ANS, MODEM_CONNECT_TONES_ANS_PR, MODEM_CONNECT_TONES_ANSAM, MODEM_CONNECT_TONES_ANSAM_PR, and MODEM_CONNECT_TONES_FAX_CNG.

int modem_connect_tones_tx_release ( modem_connect_tones_tx_state_t s  ) 

Release an instance of the modem connect tones generator.

Parameters:
s The context.
Returns:
0 for OK, else -1.
SPAN_DECLARE_NONSTD ( int   ) 

Get the next bit of a transmitted serial bit stream.

Get the next bit of data from a T.38 rate adapting non-ECM buffer context.

Get a bit of received non-ECM image data.

Get the next bit of a transmitted serial bit stream.

Parameters:
user_data An opaque point which must point to a transmitter context.
Returns:
the next bit, or PUTBIT_END_OF_DATA to indicate the data stream has ended.

Get the next bit of a transmitted serial bit stream.

Process a block of received V.8 audio samples.

Fake processing of a missing block of received V.29 modem audio samples.

Fake processing of a missing block of received V.27ter modem audio samples.

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

Fake processing of a missing block of received V.22bis modem audio samples.

Process a block of received V.18 audio samples.

Fake processing of a missing block of received V.17 modem audio samples.

Generate a block of FAX audio samples.

Apply fake received audio processing.

Generate a block of T.31 modem audio samples.

Fake processing of a missing block of received T.31 modem audio samples.

Dummy receive fillin callback.

Dummy receive callback.

Process a block of samples through an instance of the modem connect tones detector.

Get the next sequence of bytes for transmission.

Get the next byte for transmission.

Fake processing of a missing block of received FSK modem audio samples.

Process a block of received FSK modem audio samples.

Apply T.30 transmit processing to generate a block of audio samples.

Apply fake T.30 receive processing when a block of audio samples is missing (e.g due to packet loss).

Parameters:
s The FAX context.
len The number of samples to fake.
Returns:
The number of samples unprocessed. This should only be non-zero if the software has reached the end of the FAX call.

Apply T.30 transmit processing to generate a block of audio samples.

Parameters:
s The FAX context.
amp The audio sample buffer.
max_len The number of samples to be generated.
Returns:
The number of samples actually generated. This will be zero when there is nothing to send.

Process a block of received FSK modem audio samples.

Parameters:
s The modem context.
amp The audio sample buffer.
len The number of samples in the buffer.
Returns:
The number of samples unprocessed.

Fake processing of a missing block of received FSK modem audio samples (e.g due to packet loss).

Parameters:
s The modem context.
len The number of samples to fake.
Returns:
The number of samples unprocessed.
Parameters:
s A pointer to an HDLC transmitter context.
Returns:
The next byte for transmission.
Parameters:
s A pointer to an HDLC transmitter context.
buf The buffer for the data.
max_len The number of bytes to get.
Returns:
The number of bytes actually got.
Parameters:
s The context.
amp An array of signal samples.
len The number of samples in the array.
Returns:
The number of unprocessed samples.

A dummy routine to use as a receive callback, when we aren't really trying to process what is received. It just absorbs and ignores the data.

Parameters:
user_data The context.
amp The signal.buffer
len The length of the signal buffer
Returns:
0.

A dummy routine to use as a receive fillin callback, when we aren't really trying to process what is received. It just absorbs and ignores the request.

Parameters:
user_data The context.
len The length of the signal buffer
Returns:
0.

Fake processing of a missing block of received T.31 modem audio samples (e.g due to packet loss).

Parameters:
s The T.31 modem context.
len The number of samples to fake.
Returns:
The number of samples unprocessed.

Generate a block of T.31 modem audio samples.

Parameters:
s The T.31 modem context.
amp The audio sample buffer.
max_len The number of samples to be generated.
Returns:
The number of samples actually generated.

Apply fake processing when a block of audio samples is missing (e.g due to packet loss).

Parameters:
s The T.38 context.
len The number of samples to fake.
Returns:
The number of samples unprocessed. This should only be non-zero if the software has reached the end of the FAX call.

Generate a block of FAX audio samples.

Parameters:
s The T.38 context.
amp The audio sample buffer.
max_len The number of samples to be generated.
Returns:
The number of samples actually generated.

Fake processing of a missing block of received V.17 modem audio samples. (e.g due to packet loss).

Parameters:
s The modem context.
len The number of samples to fake.
Returns:
The number of samples unprocessed.

Process a block of received V.18 audio samples.

Parameters:
s The V.18 context.
amp The audio sample buffer.
len The number of samples in the buffer.

Fake processing of a missing block of received V.22bis modem audio samples. (e.g due to packet loss).

Parameters:
s The modem context.
len The number of samples to fake.
Returns:
The number of samples unprocessed.

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.

Fake processing of a missing block of received V.27ter modem audio samples. (e.g due to packet loss).

Parameters:
s The modem context.
len The number of samples to fake.
Returns:
The number of samples unprocessed.

Fake processing of a missing block of received V.29 modem audio samples. (e.g due to packet loss).

Parameters:
s The modem context.
len The number of samples to fake.
Returns:
The number of samples unprocessed.

Process a block of received V.8 audio samples.

Parameters:
s The V.8 context.
amp The audio sample buffer.
len The number of samples in the buffer.

References MODEM_CONNECT_TONES_ANS, MODEM_CONNECT_TONES_ANS_PR, MODEM_CONNECT_TONES_ANSAM, MODEM_CONNECT_TONES_ANSAM_PR, MODEM_CONNECT_TONES_FAX_CED_OR_PREAMBLE, MODEM_CONNECT_TONES_FAX_CNG, MODEM_CONNECT_TONES_FAX_PREAMBLE, and MODEM_CONNECT_TONES_NONE.


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