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t38_gateway.c File Reference

#include <inttypes.h>
#include <stdlib.h>
#include <stdio.h>
#include <fcntl.h>
#include <time.h>
#include <string.h>
#include "floating_fudge.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_detect.h"
#include "spandsp/tone_generate.h"
#include "spandsp/async.h"
#include "spandsp/crc.h"
#include "spandsp/hdlc.h"
#include "spandsp/silence_gen.h"
#include "spandsp/fsk.h"
#include "spandsp/v29tx.h"
#include "spandsp/v29rx.h"
#include "spandsp/v27ter_tx.h"
#include "spandsp/v27ter_rx.h"
#include "spandsp/v17tx.h"
#include "spandsp/v17rx.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_logging.h"
#include "spandsp/fax_modems.h"
#include "spandsp/t38_core.h"
#include "spandsp/t38_non_ecm_buffer.h"
#include "spandsp/t38_gateway.h"
#include "spandsp/private/logging.h"
#include "spandsp/private/fsk.h"
#include "spandsp/private/v17tx.h"
#include "spandsp/private/v17rx.h"
#include "spandsp/private/v27ter_tx.h"
#include "spandsp/private/v27ter_rx.h"
#include "spandsp/private/v29tx.h"
#include "spandsp/private/v29rx.h"
#include "spandsp/private/modem_connect_tones.h"
#include "spandsp/private/hdlc.h"
#include "spandsp/private/fax_modems.h"
#include "spandsp/private/t4.h"
#include "spandsp/private/t30.h"
#include "spandsp/private/t38_core.h"
#include "spandsp/private/t38_non_ecm_buffer.h"
#include "spandsp/private/t38_gateway.h"

Defines

#define MS_PER_TX_CHUNK   30
#define HDLC_START_BUFFER_LEVEL   8
#define INDICATOR_TX_COUNT   3
#define DATA_TX_COUNT   1
#define DATA_END_TX_COUNT   3
#define MAX_NSX_SUPPRESSION   10
#define HDLC_FRAMING_OK_THRESHOLD   5

Enumerations

enum  {
  DISBIT1 = 0x01, DISBIT2 = 0x02, DISBIT3 = 0x04, DISBIT4 = 0x08,
  DISBIT5 = 0x10, DISBIT6 = 0x20, DISBIT7 = 0x40, DISBIT8 = 0x80
}
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 }
enum  { FLAG_INDICATOR = 0x100, FLAG_DATA = 0x200 }
enum  {
  TCF_MODE_PREDICTABLE_MODEM_START_OFF = 0, TCF_MODE_PREDICTABLE_MODEM_START_FAST_MODEM_ANNOUNCED, TCF_MODE_PREDICTABLE_MODEM_START_FAST_MODEM_SEEN, TCF_MODE_PREDICTABLE_MODEM_START_PAST_V21_MODEM,
  TCF_MODE_PREDICTABLE_MODEM_START_BEGIN
}

Functions

 SPAN_DECLARE (int)
 Release a V.8 context.
 SPAN_DECLARE (void)
 Cleanup a T.30 context if the call terminates.
 SPAN_DECLARE (t38_core_state_t *)
 Get a pointer to the T.38 core IFP packet engine associated with a T.38 context.
 SPAN_DECLARE (logging_state_t *)
 Get a pointer to the logging context associated with a T.38 context.
 SPAN_DECLARE (t38_gateway_state_t *)

Detailed Description


Function Documentation

SPAN_DECLARE logging_state_t  ) 
 

Get a pointer to the logging context associated with a T.38 context.

Get a pointer to the logging context associated with a FAX context.

Parameters:
s The FAX context.
Returns:
A pointer to the logging context, or NULL.

SPAN_DECLARE t38_core_state_t  ) 
 

Get a pointer to the T.38 core IFP packet engine associated with a T.38 context.

Get a pointer to the T.38 core IFP packet engine associated with a gateway mode T.38 context.

Parameters:
s The T.38 context.
Returns:
A pointer to the T.38 core context, or NULL.

SPAN_DECLARE void   ) 
 

Cleanup a T.30 context if the call terminates.

Log the list of supported modulations.

Parameters:
s The V.8 context.
modulation_schemes The list of supported modulations.

SPAN_DECLARE int   ) 
 

Release a V.8 context.

Compress a block of octets.

Parameters:
s The V.42bis context.
buf The data to be compressed.
len The length of the data buffer.
Returns:
0


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