libspandsp 0.0.4
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#include <stdio.h>
#include <inttypes.h>
#include <stdlib.h>
#include <string.h>
#include "spandsp/telephony.h"
#include "spandsp/logging.h"
#include "spandsp/complex.h"
#include "spandsp/vector_float.h"
#include "spandsp/complex_vector_float.h"
#include "spandsp/async.h"
#include "spandsp/dds.h"
#include "spandsp/power_meter.h"
#include "spandsp/v17tx.h"
#include "v17tx_constellation_maps.h"
#include "v17tx_floating_rrc.h"
Defines | |
#define | CARRIER_NOMINAL_FREQ 1800.0f |
#define | V17_TRAINING_SEG_TEP_A 0 |
#define | V17_TRAINING_SEG_TEP_B (V17_TRAINING_SEG_TEP_A + 480) |
#define | V17_TRAINING_SEG_1 (V17_TRAINING_SEG_TEP_B + 48) |
#define | V17_TRAINING_SEG_2 (V17_TRAINING_SEG_1 + 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_SHUTDOWN_A (V17_TRAINING_END + 32) |
#define | V17_TRAINING_SHUTDOWN_END (V17_TRAINING_SHUTDOWN_A + 48) |
#define | V17_TRAINING_SHORT_SEG_4 (V17_TRAINING_SEG_2 + 38) |
#define | V17_BRIDGE_WORD 0x8880 |
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 bit_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 bit_rate, int tep, get_bit_func_t get_bit, void *user_data) |
Initialise a V.17 modem transmit context. | |
int | v17_tx_free (v17_tx_state_t *s) |
Free a V.17 modem transmit context. |
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. |
References v17_tx_state_t::baud_phase, v17_tx_state_t::carrier_phase, v17_tx_state_t::carrier_phase_rate, dds_complexf(), dds_complexi(), v17_tx_state_t::gain, complexf_t::im, complexf_t::re, v17_tx_state_t::rrc_filter, v17_tx_state_t::rrc_filter_step, and v17_tx_state_t::training_step.
int v17_tx_free | ( | v17_tx_state_t * | s | ) |
Free a V.17 modem transmit context.
Free a V.17 modem transmit context.
s | The modem 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.
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. |
References v17_tx_state_t::carrier_phase_rate, dds_phase_ratef(), v17_tx_state_t::get_bit, v17_tx_state_t::logging, v17_tx_state_t::user_data, v17_tx_power(), and v17_tx_restart().
Referenced by fax_init(), t31_init(), and t38_gateway_init().
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 |
References v17_tx_state_t::gain.
Referenced by v17_tx_init().
int v17_tx_restart | ( | v17_tx_state_t * | s, |
int | bit_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. |
bit_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. |
References v17_tx_state_t::baud_phase, v17_tx_state_t::bit_rate, v17_tx_state_t::bits_per_symbol, v17_tx_state_t::carrier_phase, v17_tx_state_t::constellation, v17_tx_state_t::constellation_state, v17_tx_state_t::convolution, v17_tx_state_t::current_get_bit, v17_tx_state_t::diff, v17_tx_state_t::in_training, v17_tx_state_t::rrc_filter, v17_tx_state_t::rrc_filter_step, v17_tx_state_t::scramble_reg, v17_tx_state_t::short_train, and v17_tx_state_t::training_step.
Referenced by v17_tx_init().
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. |
References v17_tx_state_t::current_get_bit, v17_tx_state_t::get_bit, and v17_tx_state_t::user_data.