t38_non_ecm_buffer.c File Reference

#include <inttypes.h>
#include <stdlib.h>
#include <stdio.h>
#include <fcntl.h>
#include <time.h>
#include <string.h>
#include <tgmath.h>
#include <math.h>
#include "floating_fudge.h"
#include <assert.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/async.h"
#include "spandsp/t38_non_ecm_buffer.h"
#include "spandsp/private/t38_non_ecm_buffer.h"

Functions

 SPAN_DECLARE_NONSTD (int)
 Get the next bit of a transmitted serial bit stream.
void t38_non_ecm_buffer_push (t38_non_ecm_buffer_state_t *s)
 Inform a T.38 rate adapting non-ECM buffer context that the incoming data has finished, and the contents of the buffer should be played out as quickly as possible.
void t38_non_ecm_buffer_inject (t38_non_ecm_buffer_state_t *s, const uint8_t *buf, int len)
 Inject data to T.38 rate adapting non-ECM buffer context.
void t38_non_ecm_buffer_report_input_status (t38_non_ecm_buffer_state_t *s, logging_state_t *logging)
 Report the input status of a T.38 rate adapting non-ECM buffer context to the specified logging context.
void t38_non_ecm_buffer_report_output_status (t38_non_ecm_buffer_state_t *s, logging_state_t *logging)
 Report the output status of a T.38 rate adapting non-ECM buffer context to the specified logging context.
void t38_non_ecm_buffer_set_mode (t38_non_ecm_buffer_state_t *s, int mode, int min_row_bits)
 Set the mode of a T.38 rate adapting non-ECM buffer context.
t38_non_ecm_buffer_state_tt38_non_ecm_buffer_init (t38_non_ecm_buffer_state_t *s, int mode, int min_row_bits)
 Initialise a T.38 rate adapting non-ECM buffer context.
int t38_non_ecm_buffer_release (t38_non_ecm_buffer_state_t *s)
int t38_non_ecm_buffer_free (t38_non_ecm_buffer_state_t *s)

Detailed Description


Function Documentation

SPAN_DECLARE_NONSTD ( int   ) 

Get the next bit of a transmitted serial bit stream.

Get the next bit of data from a T.38 rate adapting non-ECM buffer context.

Get a bit of received non-ECM image data.

Get the next bit of a transmitted serial bit stream.

Parameters:
user_data An opaque point which must point to a transmitter context.
Returns:
the next bit, or PUTBIT_END_OF_DATA to indicate the data stream has ended.

Get the next bit of a transmitted serial bit stream.

A dummy routine to use as a receive callback, when we aren't really trying to process what is received. It just absorbs and ignores the data.

Parameters:
user_data The context.
amp The signal.buffer
len The length of the signal buffer
Returns:
0.

References ASYNC_PARITY_ODD, t38_non_ecm_buffer_state_s::bit_no, async_tx_state_s::bitpos, async_tx_state_s::byte_in_progress, t38_non_ecm_buffer_state_s::data, async_tx_state_s::data_bits, t38_non_ecm_buffer_state_s::data_finished, t38_non_ecm_buffer_state_s::flow_control_fill_octet, t38_non_ecm_buffer_state_s::flow_control_fill_octets, async_tx_state_s::get_byte, t38_non_ecm_buffer_state_s::latest_eol_ptr, t38_non_ecm_buffer_state_s::octet, t38_non_ecm_buffer_state_s::out_octets, t38_non_ecm_buffer_state_s::out_ptr, async_tx_state_s::parity, async_tx_state_s::parity_bit, SIG_STATUS_END_OF_DATA, async_tx_state_s::stop_bits, T38_NON_ECM_TX_BUF_LEN, and async_tx_state_s::user_data.

t38_non_ecm_buffer_state_t* t38_non_ecm_buffer_init ( t38_non_ecm_buffer_state_t s,
int  mode,
int  min_row_bits 
)

Initialise a T.38 rate adapting non-ECM buffer context.

Parameters:
s The buffer context.
mode TRUE for image data mode, or FALSE for TCF mode.
bits The minimum number of bits per FAX image row.
Returns:
A pointer to the buffer context, or NULL if there was a problem.

Referenced by t38_gateway_init().

void t38_non_ecm_buffer_inject ( t38_non_ecm_buffer_state_t s,
const uint8_t *  buf,
int  len 
)

Inject data to T.38 rate adapting non-ECM buffer context.

Parameters:
s The buffer context.
buf The data buffer to be injected.
len The length of the data to be injected.

References T38_NON_ECM_TX_BUF_LEN.

void t38_non_ecm_buffer_push ( t38_non_ecm_buffer_state_t s  ) 

Inform a T.38 rate adapting non-ECM buffer context that the incoming data has finished, and the contents of the buffer should be played out as quickly as possible.

Parameters:
s The buffer context.
void t38_non_ecm_buffer_report_input_status ( t38_non_ecm_buffer_state_t s,
logging_state_t logging 
)

Report the input status of a T.38 rate adapting non-ECM buffer context to the specified logging context.

Parameters:
s The buffer context.
logging The logging context.

References span_log().

void t38_non_ecm_buffer_report_output_status ( t38_non_ecm_buffer_state_t s,
logging_state_t logging 
)

Report the output status of a T.38 rate adapting non-ECM buffer context to the specified logging context.

Parameters:
s The buffer context.
logging The logging context.

References span_log().

void t38_non_ecm_buffer_set_mode ( t38_non_ecm_buffer_state_t s,
int  mode,
int  min_row_bits 
)

Set the mode of a T.38 rate adapting non-ECM buffer context.

Parameters:
s The buffer context.
mode TRUE for image data mode, or FALSE for TCF mode.
bits The minimum number of bits per FAX image row.

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