#include <stdio.h>
#include <inttypes.h>
#include <stdlib.h>
#include <string.h>
#include <math.h>
#include "spandsp/telephony.h"
#include "spandsp/logging.h"
#include "spandsp/async.h"
#include "spandsp/complex.h"
#include "spandsp/dds.h"
#include "spandsp/power_meter.h"
#include "spandsp/v17tx.h"
Defines | |
#define | V17_TRAINING_TEP_LEN (480 + 48) |
#define | V17_TRAINING_TEP_SEG_2 48 |
#define | V17_TRAINING_SEG_1 0 |
#define | V17_TRAINING_SEG_2 256 |
#define | V17_TRAINING_SEG_3 (V17_TRAINING_SEG_2 + 2976) |
#define | V17_TRAINING_SEG_4 (V17_TRAINING_SEG_3 + 64) |
#define | V17_TRAINING_END (V17_TRAINING_SEG_4 + 48) |
#define | V17_TRAINING_SHORT_SEG_4 (V17_TRAINING_SEG_2 + 38) |
#define | V17_TRAINING_SHORT_END (V17_TRAINING_SHORT_SEG_4 + 48) |
#define | V17_BRIDGE_WORD 0x8880 |
#define | PULSESHAPER_GAIN 3.3228378059e+00 |
Functions | |
int | v17_tx (v17_tx_state_t *s, int16_t *amp, int len) |
Generate a block of V.17 modem audio samples. | |
void | v17_tx_power (v17_tx_state_t *s, float power) |
Adjust a V.17 modem transmit context's output power. | |
void | v17_tx_set_get_bit (v17_tx_state_t *s, get_bit_func_t get_bit, void *user_data) |
Change the get_bit function associated with a V.17 modem transmit context. | |
int | v17_tx_restart (v17_tx_state_t *s, int rate, int tep, int short_train) |
Reinitialise an existing V.17 modem transmit context. | |
v17_tx_state_t * | v17_tx_init (v17_tx_state_t *s, int rate, int tep, get_bit_func_t get_bit, void *user_data) |
Initialise a V.17 modem transmit context. | |
int | v17_tx_release (v17_tx_state_t *s) |
Release a V.17 modem transmit context. | |
Variables | |
const complex_t | v17_14400_constellation [128] |
const complex_t | v17_12000_constellation [64] |
const complex_t | v17_9600_constellation [32] |
const complex_t | v17_7200_constellation [16] |
int v17_tx | ( | v17_tx_state_t * | s, | |
int16_t * | amp, | |||
int | len | |||
) |
Generate a block of V.17 modem audio samples.
Generate a block of V.17 modem audio samples.
s | The modem context. | |
amp | The audio sample buffer. | |
len | The number of samples to be generated. |
v17_tx_state_t* v17_tx_init | ( | v17_tx_state_t * | s, | |
int | rate, | |||
int | tep, | |||
get_bit_func_t | get_bit, | |||
void * | user_data | |||
) |
Initialise a V.17 modem transmit context.
Initialise a V.17 modem transmit context. This must be called before the first use of the context, to initialise its contents.
s | The modem context. | |
rate | The bit rate of the modem. Valid values are 7200, 9600, 12000 and 14400. | |
tep | TRUE is the optional TEP tone is to be transmitted. | |
get_bit | The callback routine used to get the data to be transmitted. | |
user_data | An opaque pointer. |
void v17_tx_power | ( | v17_tx_state_t * | s, | |
float | power | |||
) |
Adjust a V.17 modem transmit context's output power.
Adjust a V.17 modem transmit context's power output.
s | The modem context. | |
power | The power level, in dBm0 |
int v17_tx_release | ( | v17_tx_state_t * | s | ) |
Release a V.17 modem transmit context.
Release a V.17 modem transmit context.
s | The modem context. |
int v17_tx_restart | ( | v17_tx_state_t * | s, | |
int | rate, | |||
int | tep, | |||
int | short_train | |||
) |
Reinitialise an existing V.17 modem transmit context.
Reinitialise an existing V.17 modem transmit context, so it may be reused.
s | The modem context. | |
rate | The bit rate of the modem. Valid values are 7200, 9600, 12000 and 14400. | |
tep | TRUE is the optional TEP tone is to be transmitted. | |
short_train | TRUE if the short training sequence should be used. |
void v17_tx_set_get_bit | ( | v17_tx_state_t * | s, | |
get_bit_func_t | get_bit, | |||
void * | user_data | |||
) |
Change the get_bit function associated with a V.17 modem transmit context.
Change the get_bit function associated with a V.17 modem transmit context.
s | The modem context. | |
get_bit | The callback routine used to get the data to be transmitted. | |
user_data | An opaque pointer. |
const complex_t v17_7200_constellation[16] |
Initial value:
{ { 6, -6}, {-2, 6}, { 6, 2}, {-6, -6}, {-6, 6}, { 2, -6}, {-6, -2}, { 6, 6}, {-2, 2}, { 6, -2}, {-2, -6}, { 2, 2}, { 2, -2}, {-6, 2}, { 2, 6}, {-2, -2} }