fax.c File Reference

#include <inttypes.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include "floating_fudge.h"
#include <assert.h>
#include <fcntl.h>
#include <time.h>
#include <tiffio.h>
#include "spandsp/telephony.h"
#include "spandsp/logging.h"
#include "spandsp/queue.h"
#include "spandsp/dc_restore.h"
#include "spandsp/power_meter.h"
#include "spandsp/complex.h"
#include "spandsp/tone_detect.h"
#include "spandsp/tone_generate.h"
#include "spandsp/async.h"
#include "spandsp/hdlc.h"
#include "spandsp/silence_gen.h"
#include "spandsp/fsk.h"
#include "spandsp/v29rx.h"
#include "spandsp/v29tx.h"
#include "spandsp/v27ter_rx.h"
#include "spandsp/v27ter_tx.h"
#include "spandsp/v17rx.h"
#include "spandsp/v17tx.h"
#include "spandsp/super_tone_rx.h"
#include "spandsp/modem_connect_tones.h"
#include "spandsp/t4.h"
#include "spandsp/t30_fcf.h"
#include "spandsp/t35.h"
#include "spandsp/t30.h"
#include "spandsp/t30_api.h"
#include "spandsp/t30_logging.h"
#include "spandsp/fax_modems.h"
#include "spandsp/fax.h"

Defines
#define	HDLC_FRAMING_OK_THRESHOLD   5
Functions
int	fax_rx (fax_state_t *s, int16_t *amp, int len)
	Apply T.30 receive processing to a block of audio samples.
int	fax_tx (fax_state_t *s, int16_t *amp, int max_len)
	Apply T.30 transmit processing to generate a block of audio samples.
void	fax_set_transmit_on_idle (fax_state_t *s, int transmit_on_idle)
	Select whether silent audio will be sent when FAX transmit is idle.
void	fax_set_tep_mode (fax_state_t *s, int use_tep)
	Select whether TEP will be sent for the image modems.
t30_state_t *	fax_get_t30_state (fax_state_t *s)
	Get a pointer to the T.30 engine associated with a FAX context.
fax_state_t *	fax_init (fax_state_t *s, int calling_party)
	Initialise a FAX context.
int	fax_release (fax_state_t *s)
	Release a FAX context.
int	fax_free (fax_state_t *s)
	Free a FAX context.

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Detailed Description

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Function Documentation

int fax_free

(

fax_state_t *

s

)

Free a FAX context.

Free a FAX context.

Parameters:

s

The FAX context.

Returns:

0 for OK, else -1.

References fax_state_s::t30, and t30_release().

t30_state_t* fax_get_t30_state

(

fax_state_t *

s

)

Get a pointer to the T.30 engine associated with a FAX context.

Get a pointer to the T.30 engine associated with a FAX context.

Parameters:

s

The FAX context.

Returns:

A pointer to the T.30 context, or NULL.

References fax_state_s::t30.

fax_state_t* fax_init	(	fax_state_t *	s,
		int	calling_party
	)

Initialise a FAX context.

Initialise a FAX context.

Parameters:

	s	The FAX context.
	calling_party	TRUE if the context is for a calling party. FALSE if the context is for an answering party.

Returns:

A pointer to the FAX context, or NULL if there was a problem.

References fax_state_s::logging, fax_state_s::modems, fax_state_s::t30, t30_init(), t30_restart(), and t30_set_supported_modems().

int fax_release

(

fax_state_t *

s

)

Release a FAX context.

Release a FAX context.

Parameters:

s

The FAX context.

Returns:

0 for OK, else -1.

References fax_state_s::t30, and t30_release().

int fax_rx	(	fax_state_t *	s,
		int16_t *	amp,
		int	len
	)

Apply T.30 receive processing to a block of audio samples.

Apply T.30 receive processing to a block of audio samples.

Parameters:

	s	The FAX context.
	amp	The audio sample buffer.
	len	The number of samples in the buffer.

Returns:

The number of samples unprocessed. This should only be non-zero if the software has reached the end of the FAX call.

References fax_modems_state_t::audio_rx_log, fax_modems_state_t::dc_restore, fax_state_s::modems, fax_modems_state_t::rx_handler, fax_modems_state_t::rx_user_data, fax_state_s::t30, and t30_timer_update().

void fax_set_tep_mode	(	fax_state_t *	s,
		int	use_tep
	)

Select whether TEP will be sent for the image modems.

Select whether talker echo protection tone will be sent for the image modems.

Parameters:

	s	The FAX context.
	use_tep	TRUE if TEP should be sent.

References fax_state_s::modems, and fax_modems_state_t::use_tep.

void fax_set_transmit_on_idle	(	fax_state_t *	s,
		int	transmit_on_idle
	)

Select whether silent audio will be sent when FAX transmit is idle.

Select whether silent audio will be sent when FAX transmit is idle.

Parameters:

	s	The FAX context.
	transmit_on_idle	TRUE if silent audio should be output when the FAX transmitter is idle. FALSE to transmit zero length audio when the FAX transmitter is idle. The default behaviour is FALSE.

References fax_state_s::modems, and fax_modems_state_t::transmit_on_idle.

int fax_tx	(	fax_state_t *	s,
		int16_t *	amp,
		int	max_len
	)

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

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.

References fax_modems_state_t::audio_tx_log, fax_modems_state_t::current_tx_type, fax_state_s::modems, fax_state_s::t30, t30_front_end_status(), fax_modems_state_t::transmit, fax_modems_state_t::transmit_on_idle, fax_modems_state_t::tx_handler, and fax_modems_state_t::tx_user_data.