t38_gateway.c File Reference

#include <inttypes.h>
#include <stdlib.h>
#include <stdio.h>
#include <fcntl.h>
#include <time.h>
#include <string.h>
#include <assert.h>
#include <tiffio.h>
#include "spandsp/telephony.h"
#include "spandsp/logging.h"
#include "spandsp/queue.h"
#include "spandsp/dc_restore.h"
#include "spandsp/bit_operations.h"
#include "spandsp/power_meter.h"
#include "spandsp/complex.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/t4.h"
#include "spandsp/t30_fcf.h"
#include "spandsp/t35.h"
#include "spandsp/t30.h"
#include "spandsp/t38_core.h"
#include "spandsp/t38_gateway.h"

Defines
#define	MS_PER_TX_CHUNK   30
#define	INDICATOR_TX_COUNT   3
#define	DATA_TX_COUNT   1
#define	DATA_END_TX_COUNT   1
#define	DISBIT1   0x01
#define	DISBIT2   0x02
#define	DISBIT3   0x04
#define	DISBIT4   0x08
#define	DISBIT5   0x10
#define	DISBIT6   0x20
#define	DISBIT7   0x40
#define	DISBIT8   0x80
Enumerations
enum	{ T38_NONE, T38_V27TER_RX, T38_V29_RX, T38_V17_RX }
enum	{ HDLC_FLAG_FINISHED = 0x01, HDLC_FLAG_CORRUPT_CRC = 0x02, HDLC_FLAG_PROCEED_WITH_OUTPUT = 0x04, HDLC_FLAG_MISSING_DATA = 0x08 }
Functions
int	t38_gateway_rx (t38_gateway_state_t *s, int16_t amp[], int len)
	Process a block of received FAX audio samples.
int	t38_gateway_tx (t38_gateway_state_t *s, int16_t amp[], int max_len)
	Generate a block of FAX audio samples.
void	t38_gateway_set_ecm_capability (t38_gateway_state_t *s, int ecm_allowed)
	Control whether error correcting mode (ECM) is allowed.
void	t38_gateway_set_transmit_on_idle (t38_gateway_state_t *s, int transmit_on_idle)
void	t38_gateway_set_supported_modems (t38_gateway_state_t *s, int supported_modems)
void	t38_gateway_set_nsx_suppression (t38_gateway_state_t *s, int suppress_nsx)
t38_gateway_state_t *	t38_gateway_init (t38_gateway_state_t *s, t38_tx_packet_handler_t *tx_packet_handler, void *tx_packet_user_data)
	Initialise a gateway mode T.38 context.

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Detailed Description

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Function Documentation

t38_gateway_state_t* t38_gateway_init	(	t38_gateway_state_t *	s,
		t38_tx_packet_handler_t *	tx_packet_handler,
		void *	tx_packet_user_data
	)

Initialise a gateway mode T.38 context.

Parameters:

	s	The T.38 context.
	tx_packet_handler	A callback routine to encapsulate and transmit T.38 packets.
	tx_packet_user_data	An opaque pointer passed to the tx_packet_handler routine.

Returns:

A pointer to the termination mode T.38 context, or NULL if there was a problem.

int t38_gateway_rx	(	t38_gateway_state_t *	s,
		int16_t	amp[],
		int	len
	)

Process a block of received FAX audio samples.

Process a block of received FAX audio samples.

Parameters:

	s	The T.38 context.
	amp	The audio sample buffer.
	len	The number of samples in the buffer.

Returns:

The number of samples unprocessed.

void t38_gateway_set_ecm_capability	(	t38_gateway_state_t *	s,
		int	ecm_allowed
	)

Control whether error correcting mode (ECM) is allowed.

Control whether error correcting mode (ECM) is allowed.

Parameters:

	s	The T.38 context.
	ecm_allowed	TRUE is ECM is to be allowed.

int t38_gateway_tx	(	t38_gateway_state_t *	s,
		int16_t	amp[],
		int	max_len
	)

Generate a block of FAX audio samples.

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.

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