#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/silence_gen.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 | |
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_get_transfer_statistics (t38_gateway_state_t *s, t38_stats_t *t) |
Get the current transfer statistics. | |
t38_core_state_t * | t38_gateway_get_t38_core_state (t38_gateway_state_t *s) |
Get a pointer to the T.38 core IFP packet engine associated with a T.38 context. | |
logging_state_t * | t38_gateway_get_logging_state (t38_gateway_state_t *s) |
Get a pointer to the logging context associated with a T.38 context. | |
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) |
Select whether silent audio will be sent when transmit is idle. | |
void | t38_gateway_set_supported_modems (t38_gateway_state_t *s, int supported_modems) |
Specify supported modems. | |
void | t38_gateway_set_nsx_suppression (t38_gateway_state_t *s, const uint8_t *from_t38, int from_t38_len, const uint8_t *from_modem, int from_modem_len) |
Select whether NSC, NSF, and NSS should be suppressed. | |
void | t38_gateway_set_tep_mode (t38_gateway_state_t *s, int use_tep) |
Select whether TEP will be sent for the image modems. | |
void | t38_gateway_set_fill_bit_removal (t38_gateway_state_t *s, int remove) |
Select whether non-ECM fill bits are to be removed during transmission. | |
void | t38_gateway_set_real_time_frame_handler (t38_gateway_state_t *s, t38_gateway_real_time_frame_handler_t *handler, void *user_data) |
Set a callback function for T.30 frame exchange monitoring. | |
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. | |
int | t38_gateway_release (t38_gateway_state_t *s) |
Release a T.38 context. | |
int | t38_gateway_free (t38_gateway_state_t *s) |
Free a T.38 context. |
#define DATA_END_TX_COUNT 3 |
The number of transmissions of terminating data IFP packets
#define DATA_TX_COUNT 1 |
The number of transmissions of data IFP packets
#define HDLC_FRAMING_OK_THRESHOLD 5 |
The number of consecutive flags to declare HDLC framing is OK.
#define HDLC_START_BUFFER_LEVEL 8 |
The number of bytes which must be in the audio to T.38 HDLC buffer before we start outputting them as IFP messages.
#define INDICATOR_TX_COUNT 3 |
The number of transmissions of indicator IFP packets
#define MAX_NSX_SUPPRESSION 10 |
The maximum number of bytes to be zapped, in order to corrupt NSF, NSS and NSC messages, so the receiver does not recognise them.
Referenced by t38_gateway_set_nsx_suppression().
#define MS_PER_TX_CHUNK 30 |
The default number of milliseconds per transmitted IFP when sending bulk T.38 data
int t38_gateway_free | ( | t38_gateway_state_t * | s | ) |
Free a T.38 context.
Free a gateway mode T.38 context.
s | The T.38 context. |
logging_state_t* t38_gateway_get_logging_state | ( | t38_gateway_state_t * | s | ) |
Get a pointer to the logging context associated with a T.38 context.
Get a pointer to the logging context associated with a T.38 context.
s | The T.38 context. |
t38_core_state_t* t38_gateway_get_t38_core_state | ( | t38_gateway_state_t * | s | ) |
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.
s | The T.38 context. |
void t38_gateway_get_transfer_statistics | ( | t38_gateway_state_t * | s, | |
t38_stats_t * | t | |||
) |
Get the current transfer statistics.
Get the current transfer statistics for the current T.38 session.
s | The T.38 context. | |
t | A pointer to a buffer for the statistics. |
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.
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. |
References T30_SUPPORT_V27TER, T30_SUPPORT_V29, t38_gateway_set_nsx_suppression(), t38_gateway_set_supported_modems(), and t38_non_ecm_buffer_init().
int t38_gateway_release | ( | t38_gateway_state_t * | s | ) |
Release a T.38 context.
Release a gateway mode T.38 context.
s | The T.38 context. |
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.
s | The T.38 context. | |
amp | The audio sample buffer. | |
len | The number of samples in the buffer. |
References ms_to_samples, and span_log().
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.
s | The T.38 context. | |
ecm_allowed | TRUE is ECM is to be allowed. |
void t38_gateway_set_fill_bit_removal | ( | t38_gateway_state_t * | s, | |
int | remove | |||
) |
Select whether non-ECM fill bits are to be removed during transmission.
Select whether non-ECM fill bits are to be removed during transmission.
s | The T.38 context. | |
remove | TRUE if fill bits are to be removed. |
void t38_gateway_set_nsx_suppression | ( | t38_gateway_state_t * | s, | |
const uint8_t * | from_t38, | |||
int | from_t38_len, | |||
const uint8_t * | from_modem, | |||
int | from_modem_len | |||
) |
Select whether NSC, NSF, and NSS should be suppressed.
Select whether NSC, NSF, and NSS should be suppressed. It selected, the contents of these messages are forced to zero for all octets beyond the message type. This makes them look like manufacturer specific messages, from a manufacturer which does not exist.
s | The T.38 context. | |
from_t38 | A string of bytes to overwrite the header of any NSC, NSF, and NSS frames passing through the gateway from T.38 the the modem. | |
from_t38_len | The length of the overwrite string. | |
from_modem | A string of bytes to overwrite the header of any NSC, NSF, and NSS frames passing through the gateway from the modem to T.38. | |
from_modem_len | The length of the overwrite string. |
References MAX_NSX_SUPPRESSION.
Referenced by t38_gateway_init().
void t38_gateway_set_real_time_frame_handler | ( | t38_gateway_state_t * | s, | |
t38_gateway_real_time_frame_handler_t * | handler, | |||
void * | user_data | |||
) |
Set a callback function for T.30 frame exchange monitoring.
Set a callback function for T.30 frame exchange monitoring. This is called from the heart of the signal processing, so don't take too long in the handler routine.
s | The T.30 context. | |
handler | The callback function. | |
user_data | An opaque pointer passed to the callback function. |
void t38_gateway_set_supported_modems | ( | t38_gateway_state_t * | s, | |
int | supported_modems | |||
) |
Specify supported modems.
Specify which modem types are supported by a T.30 context.
s | The T.38 context. | |
supported_modems | Bit field list of the supported modems. |
References T30_SUPPORT_V17, and T30_SUPPORT_V29.
Referenced by t38_gateway_init().
void t38_gateway_set_tep_mode | ( | t38_gateway_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.
s | The T.38 context. | |
use_tep | TRUE if TEP should be sent. |
void t38_gateway_set_transmit_on_idle | ( | t38_gateway_state_t * | s, | |
int | transmit_on_idle | |||
) |
Select whether silent audio will be sent when transmit is idle.
Select whether silent audio will be sent when transmit is idle.
s | The T.38 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. |
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.
s | The T.38 context. | |
amp | The audio sample buffer. | |
max_len | The number of samples to be generated. |
References silence_gen_set().