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/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_ecm_control (t38_gateway_state_t *s, int ecm_allowed)
	Control whether error correcting mode (ECM) is allowed.
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

void t38_gateway_ecm_control (  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.

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.

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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