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main.c
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main.c
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#include "main.h"
#include <float.h>
/*** Remember to talk to Rob M0DTS about his minitiune click software before making changes! ***/
#define WS_PORT 7681
#define WS_INTERVAL 250
#define WS_INTERVAL_FAST 100
#define FFT_SIZE 1024
#define FFT_TIME_SMOOTH 0.9995f // 0.0 - 1.0
#define AIRSPY_FREQ 745000000
#define AIRSPY_SAMPLE 10000000
#define AIRSPY_SERIAL 0x644064DC2354AACD // WB
/** LWS Vars **/
int max_poll_elements;
int debug_level = 3;
volatile int force_exit = 0;
struct lws_context *context;
uint32_t lws_count_fft = 0;
uint32_t lws_count_fft_fast = 0;
uint32_t lws_count_fft_m0dtslivetune = 0;
uint32_t lws_count_fft_f5oeoplutofw = 0;
uint32_t lws_count_fft_ea7kirsatcontroller = 0;
#define STDOUT_INTERVAL_CONNCOUNT 30*1000
pthread_t fftThread;
pthread_t wsThread;
static void sleep_ms(uint32_t _duration)
{
struct timespec req, rem;
req.tv_sec = _duration / 1000;
req.tv_nsec = (_duration - (req.tv_sec*1000))*1000*1000;
while(nanosleep(&req, &rem) == EINTR)
{
/* Interrupted by signal, shallow copy remaining time into request, and resume */
req = rem;
}
}
/** AirSpy Vars **/
struct airspy_device* device = NULL;
/* Sample type -> 32bit Complex Float */
enum airspy_sample_type sample_type_val = AIRSPY_SAMPLE_FLOAT32_IQ;
/* Sample rate */
uint32_t sample_rate_val = AIRSPY_SAMPLE;
/* DC Bias Tee -> 0 (disabled) */
uint32_t biast_val = 0;
/* Linear Gain */
#define LINEAR
uint32_t linearity_gain_val = 12; // MAX=21
/* Sensitive Gain */
//#define SENSITIVE
uint32_t sensitivity_gain_val = 10; // MAX=21
/* Frequency */
uint32_t freq_hz = AIRSPY_FREQ;
double hanning_window_const[FFT_SIZE];
int airspy_rx(airspy_transfer_t* transfer);
#define FLOAT32_EL_SIZE_BYTE (4)
fftw_complex* fft_in;
fftw_complex* fft_out;
fftw_plan fft_plan;
static const char *fftw_wisdom_filename = ".fftw_wisdom";
void setup_fft(void)
{
int i;
/* Set up FFTW */
fft_in = (fftw_complex*) fftw_malloc(sizeof(fftw_complex) * FFT_SIZE);
fft_out = (fftw_complex*) fftw_malloc(sizeof(fftw_complex) * FFT_SIZE);
i = fftw_import_wisdom_from_filename(fftw_wisdom_filename);
if(i == 0)
{
fprintf(stdout, "Computing plan...");
fflush(stdout);
}
fft_plan = fftw_plan_dft_1d(FFT_SIZE, fft_in, fft_out, FFTW_FORWARD, FFTW_EXHAUSTIVE);
if(i == 0)
{
fftw_export_wisdom_to_filename(fftw_wisdom_filename);
}
}
static void close_airspy(void)
{
int result;
/* De-init AirSpy device */
if(device != NULL)
{
result = airspy_stop_rx(device);
if( result != AIRSPY_SUCCESS ) {
printf("airspy_stop_rx() failed: %s (%d)\n", airspy_error_name(result), result);
}
result = airspy_close(device);
if( result != AIRSPY_SUCCESS )
{
printf("airspy_close() failed: %s (%d)\n", airspy_error_name(result), result);
}
airspy_exit();
}
}
static void close_fftw(void)
{
/* De-init fftw */
fftw_free(fft_in);
fftw_free(fft_out);
fftw_destroy_plan(fft_plan);
fftw_forget_wisdom();
}
static uint8_t setup_airspy()
{
int result;
result = airspy_init();
if( result != AIRSPY_SUCCESS ) {
printf("airspy_init() failed: %s (%d)\n", airspy_error_name(result), result);
return 0;
}
#ifdef AIRSPY_SERIAL
result = airspy_open_sn(&device, AIRSPY_SERIAL);
#else
result = airspy_open(&device);
#endif
if( result != AIRSPY_SUCCESS ) {
printf("airspy_open() failed: %s (%d)\n", airspy_error_name(result), result);
airspy_exit();
return 0;
}
result = airspy_set_sample_type(device, sample_type_val);
if (result != AIRSPY_SUCCESS) {
printf("airspy_set_sample_type() failed: %s (%d)\n", airspy_error_name(result), result);
airspy_close(device);
airspy_exit();
return 0;
}
result = airspy_set_samplerate(device, sample_rate_val);
if (result != AIRSPY_SUCCESS) {
printf("airspy_set_samplerate() failed: %s (%d)\n", airspy_error_name(result), result);
airspy_close(device);
airspy_exit();
return 0;
}
result = airspy_set_rf_bias(device, biast_val);
if( result != AIRSPY_SUCCESS ) {
printf("airspy_set_rf_bias() failed: %s (%d)\n", airspy_error_name(result), result);
airspy_close(device);
airspy_exit();
return 0;
}
#ifdef LINEAR
result = airspy_set_linearity_gain(device, linearity_gain_val);
if( result != AIRSPY_SUCCESS ) {
printf("airspy_set_linearity_gain() failed: %s (%d)\n", airspy_error_name(result), result);
}
#elif defined SENSITIVE
result = airspy_set_sensitivity_gain(device, sensitivity_gain_val);
if( result != AIRSPY_SUCCESS ) {
printf("airspy_set_sensitivity_gain() failed: %s (%d)\n", airspy_error_name(result), result);
}
#endif
result = airspy_start_rx(device, airspy_rx, NULL);
if( result != AIRSPY_SUCCESS ) {
printf("airspy_start_rx() failed: %s (%d)\n", airspy_error_name(result), result);
airspy_close(device);
airspy_exit();
return 0;
}
result = airspy_set_freq(device, freq_hz);
if( result != AIRSPY_SUCCESS ) {
printf("airspy_set_freq() failed: %s (%d)\n", airspy_error_name(result), result);
airspy_close(device);
airspy_exit();
return 0;
}
return 1;
}
/* transfer->sample_count is normally 65536 */
#define AIRSPY_BUFFER_COPY_SIZE 65536
typedef struct {
uint32_t index;
uint32_t size;
char data[AIRSPY_BUFFER_COPY_SIZE * FLOAT32_EL_SIZE_BYTE];
pthread_mutex_t mutex;
pthread_cond_t signal;
} rf_buffer_t;
rf_buffer_t rf_buffer = {
.index = 0,
.size = 0,
.mutex = PTHREAD_MUTEX_INITIALIZER,
.signal = PTHREAD_COND_INITIALIZER,
.data = { 0 }
};
/* Airspy RX Callback, this is called by a new thread within libairspy */
int airspy_rx(airspy_transfer_t* transfer)
{
if(transfer->samples != NULL && transfer->sample_count >= AIRSPY_BUFFER_COPY_SIZE)
{
pthread_mutex_lock(&rf_buffer.mutex);
rf_buffer.index = 0;
memcpy(
rf_buffer.data,
transfer->samples,
(AIRSPY_BUFFER_COPY_SIZE * FLOAT32_EL_SIZE_BYTE)
);
/* Double size as we're running half overlap on the FFTs, but then minus one so we don't overrun the end */
rf_buffer.size = (2 * (AIRSPY_BUFFER_COPY_SIZE / (FFT_SIZE * 2))) - 1;
pthread_cond_signal(&rf_buffer.signal);
pthread_mutex_unlock(&rf_buffer.mutex);
}
return 0;
}
typedef struct {
float data[FFT_SIZE];
pthread_mutex_t mutex;
} fft_buffer_t;
fft_buffer_t fft_buffer = {
.mutex = PTHREAD_MUTEX_INITIALIZER,
};
/* FFT Thread */
void *thread_fft(void *dummy)
{
(void) dummy;
int i, offset;
fftw_complex pt;
double pwr, lpwr;
double pwr_scale = 1.0 / ((float)FFT_SIZE * (float)FFT_SIZE);
while(1)
{
/* Lock input buffer */
pthread_mutex_lock(&rf_buffer.mutex);
if(rf_buffer.index == rf_buffer.size)
{
/* Wait for signalled input */
pthread_cond_wait(&rf_buffer.signal, &rf_buffer.mutex);
}
/* Move forward half an FFT length, giving half an FFT of overlap */
offset = (rf_buffer.index * FFT_SIZE * 2) / 2;
/* Copy data out of rf buffer into fft_input buffer */
for (i = 0; i < FFT_SIZE; i++)
{
fft_in[i][0] = ((float*)rf_buffer.data)[offset+(2*i)] * hanning_window_const[i];
fft_in[i][1] = ((float*)rf_buffer.data)[offset+(2*i)+1] * hanning_window_const[i];
}
rf_buffer.index++;
/* Unlock input buffer */
pthread_mutex_unlock(&rf_buffer.mutex);
/* Run FFT */
fftw_execute(fft_plan);
/* Lock output buffer */
pthread_mutex_lock(&fft_buffer.mutex);
for (i = 0; i < FFT_SIZE; i++)
{
/* shift, normalize and convert to dBFS */
if (i < FFT_SIZE / 2)
{
pt[0] = fft_out[FFT_SIZE / 2 + i][0] / FFT_SIZE;
pt[1] = fft_out[FFT_SIZE / 2 + i][1] / FFT_SIZE;
}
else
{
pt[0] = fft_out[i - FFT_SIZE / 2][0] / FFT_SIZE;
pt[1] = fft_out[i - FFT_SIZE / 2][1] / FFT_SIZE;
}
pwr = pwr_scale * ((pt[0] * pt[0]) + (pt[1] * pt[1]));
lpwr = 10.f * log10(pwr + 1.0e-20);
fft_buffer.data[i] = (lpwr * (1.f - FFT_TIME_SMOOTH)) + (fft_buffer.data[i] * FFT_TIME_SMOOTH);
}
/* Unlock output buffer */
pthread_mutex_unlock(&fft_buffer.mutex);
}
}
#define WEBSOCKET_OUTPUT_LENGTH 4096
typedef struct {
uint8_t buffer[LWS_PRE+WEBSOCKET_OUTPUT_LENGTH];
uint32_t length;
uint32_t sequence_id;
pthread_mutex_t mutex;
} websocket_output_t;
websocket_output_t websocket_output = {
.length = 0,
.sequence_id = 0,
.mutex = PTHREAD_MUTEX_INITIALIZER
};
websocket_output_t websocket_output_fast = {
.length = 0,
.sequence_id = 0,
.mutex = PTHREAD_MUTEX_INITIALIZER
};
/* OLD
#define FFT_OFFSET 85
#define FFT_SCALE 3000.0
#define FLOOR_TARGET 8500
#define FLOOR_TIME_SMOOTH 0.995
*/
#define FFT_PRESCALE 3.0
#define FFT_OFFSET (150)
#define FFT_SCALE (9e3)
#define FLOOR_TARGET (FFT_PRESCALE * 47000)
#define FLOOR_TIME_SMOOTH 0.995
#define FLOOR_OFFSET (FFT_PRESCALE * 38000)
static uint32_t lowest_smooth = FLOOR_TARGET;
static uint32_t fft_output_data[FFT_SIZE];
void fft_to_buffer(websocket_output_t *_websocket_output)
{
int32_t i, j;
uint32_t lowest;
int32_t offset;
uint16_t *websocket_output_buffer_ptr;
/* Create and append data points */
i = 0;
//uint32_t min = 0xFFFFFFFF, max = 0;
//float fmin = FLT_MAX, fmax = -FLT_MAX;
/* Lock FFT output buffer for reading */
pthread_mutex_lock(&fft_buffer.mutex);
for(j=(FFT_SIZE*0.05);j<(FFT_SIZE*0.95);j++)
{
fft_output_data[i] = (uint32_t)(FFT_SCALE * (fft_buffer.data[j] + FFT_OFFSET)) + (FFT_PRESCALE*fft_line_compensation[j]);
//if(fft_buffer.data[j] > fmax) fmax = fft_buffer.data[j];
//if(fft_buffer.data[j] < fmin) fmin = fft_buffer.data[j];
//if(fft_output_data[i] > max) max = fft_output_data[i] ;
//if(fft_output_data[i] < min) min = fft_output_data[i] ;
i++;
}
/* Unlock FFT output buffer */
pthread_mutex_unlock(&fft_buffer.mutex);
//printf("min: %"PRIu32"\n", min);
//printf("max: %"PRIu32"\n", max);
//printf("fmin: %f\n", fmin);
//printf("fmax: %f\n", fmax);
/* Calculate noise floor */
lowest = 0xFFFFFFFF;
for(j = (FFT_SIZE*0.05); j < i - (FFT_SIZE*0.1); j++)
{
if(fft_output_data[j] < lowest)
{
lowest = fft_output_data[j];
}
}
lowest_smooth = (lowest * (1.f - FLOOR_TIME_SMOOTH)) + (lowest_smooth * FLOOR_TIME_SMOOTH);
/* Compensate for noise floor */
offset = (FLOOR_TARGET) - lowest_smooth;
//printf("lowest: %d, lowest_smooth: %d, offset: %d\n", lowest, lowest_smooth, offset);
for(j = 0; j < i; j++)
{
/* Add noise-floor AGC offset (can be negative) */
fft_output_data[j] += offset;
/* Subtract viewport floor offset and set to zero if underflow */
if(__builtin_usub_overflow(fft_output_data[j], (uint32_t)FLOOR_OFFSET, &fft_output_data[j]))
{
fft_output_data[j] = 0;
}
/* Divide output by FFT_PRESCALE to scale for uint16_t */
fft_output_data[j] /= FFT_PRESCALE;
/* Catch data overflow */
if(fft_output_data[j] > 0xFFFF)
{
fft_output_data[j] = 0xFFFF;
}
}
/* Lock websocket output buffer for writing */
pthread_mutex_lock(&_websocket_output->mutex);
websocket_output_buffer_ptr = (uint16_t *)&_websocket_output->buffer[LWS_PRE];
/* Copy data into websocket output buffer */
for(j = 0; j < i; j++)
{
websocket_output_buffer_ptr[j] = fft_output_data[j];
}
_websocket_output->length = 2*i;
_websocket_output->sequence_id++;
pthread_mutex_unlock(&_websocket_output->mutex);
}
typedef struct websocket_user_session_t websocket_user_session_t;
struct websocket_user_session_t {
websocket_user_session_t *websocket_user_session_list;
struct lws *wsi;
uint32_t last_sequence_id;
};
typedef struct {
struct lws_context *context;
struct lws_vhost *vhost;
const struct lws_protocols *protocol;
websocket_user_session_t *websocket_user_session_list;
} websocket_vhost_session_t;
int callback_fft(struct lws *wsi, enum lws_callback_reasons reason, void *user, void *in, size_t len)
{
(void)in;
(void)len;
int32_t n;
websocket_user_session_t *user_session = (websocket_user_session_t *)user;
websocket_vhost_session_t *vhost_session =
(websocket_vhost_session_t *)
lws_protocol_vh_priv_get(lws_get_vhost(wsi),
lws_get_protocol(wsi));
switch (reason)
{
case LWS_CALLBACK_PROTOCOL_INIT:
vhost_session = lws_protocol_vh_priv_zalloc(lws_get_vhost(wsi),
lws_get_protocol(wsi),
sizeof(websocket_vhost_session_t));
vhost_session->context = lws_get_context(wsi);
vhost_session->protocol = lws_get_protocol(wsi);
vhost_session->vhost = lws_get_vhost(wsi);
break;
case LWS_CALLBACK_ESTABLISHED:
/* add ourselves to the list of live pss held in the vhd */
lws_ll_fwd_insert(
user_session,
websocket_user_session_list,
vhost_session->websocket_user_session_list
);
user_session->wsi = wsi;
/* Update connection count */
n = 0;
lws_start_foreach_ll(websocket_user_session_t *, ___pss, vhost_session->websocket_user_session_list) {
n++;
} lws_end_foreach_ll(___pss, websocket_user_session_list);
lws_count_fft = n;
break;
case LWS_CALLBACK_CLOSED:
/* remove our closing pss from the list of live pss */
lws_ll_fwd_remove(
websocket_user_session_t,
websocket_user_session_list,
user_session,
vhost_session->websocket_user_session_list
);
/* Update connection count */
n = 0;
lws_start_foreach_ll(websocket_user_session_t *, ___pss, vhost_session->websocket_user_session_list) {
n++;
} lws_end_foreach_ll(___pss, websocket_user_session_list);
lws_count_fft = n;
break;
case LWS_CALLBACK_SERVER_WRITEABLE:
/* Write output data, if data exists */
pthread_mutex_lock(&websocket_output.mutex);
if(websocket_output.length != 0 && user_session->last_sequence_id != websocket_output.sequence_id)
{
n = lws_write(wsi, (unsigned char*)&websocket_output.buffer[LWS_PRE], websocket_output.length, LWS_WRITE_BINARY);
if (!n)
{
pthread_mutex_unlock(&websocket_output.mutex);
lwsl_err("ERROR %d writing to socket\n", n);
return -1;
}
user_session->last_sequence_id = websocket_output.sequence_id;
}
pthread_mutex_unlock(&websocket_output.mutex);
break;
case LWS_CALLBACK_RECEIVE:
/* Not expecting to receive anything */
break;
default:
break;
}
return 0;
}
int callback_fft_modtslivetune(struct lws *wsi, enum lws_callback_reasons reason, void *user, void *in, size_t len)
{
(void)in;
(void)len;
int32_t n;
websocket_user_session_t *user_session = (websocket_user_session_t *)user;
websocket_vhost_session_t *vhost_session =
(websocket_vhost_session_t *)
lws_protocol_vh_priv_get(lws_get_vhost(wsi),
lws_get_protocol(wsi));
switch (reason)
{
case LWS_CALLBACK_PROTOCOL_INIT:
vhost_session = lws_protocol_vh_priv_zalloc(lws_get_vhost(wsi),
lws_get_protocol(wsi),
sizeof(websocket_vhost_session_t));
vhost_session->context = lws_get_context(wsi);
vhost_session->protocol = lws_get_protocol(wsi);
vhost_session->vhost = lws_get_vhost(wsi);
break;
case LWS_CALLBACK_ESTABLISHED:
/* add ourselves to the list of live pss held in the vhd */
lws_ll_fwd_insert(
user_session,
websocket_user_session_list,
vhost_session->websocket_user_session_list
);
user_session->wsi = wsi;
/* Update connection count */
n = 0;
lws_start_foreach_ll(websocket_user_session_t *, ___pss, vhost_session->websocket_user_session_list) {
n++;
} lws_end_foreach_ll(___pss, websocket_user_session_list);
lws_count_fft_m0dtslivetune = n;
break;
case LWS_CALLBACK_CLOSED:
/* remove our closing pss from the list of live pss */
lws_ll_fwd_remove(
websocket_user_session_t,
websocket_user_session_list,
user_session,
vhost_session->websocket_user_session_list
);
/* Update connection count */
n = 0;
lws_start_foreach_ll(websocket_user_session_t *, ___pss, vhost_session->websocket_user_session_list) {
n++;
} lws_end_foreach_ll(___pss, websocket_user_session_list);
lws_count_fft_m0dtslivetune = n;
break;
case LWS_CALLBACK_SERVER_WRITEABLE:
/* Write output data, if data exists */
pthread_mutex_lock(&websocket_output.mutex);
if(websocket_output.length != 0 && user_session->last_sequence_id != websocket_output.sequence_id)
{
n = lws_write(wsi, (unsigned char*)&websocket_output.buffer[LWS_PRE], websocket_output.length, LWS_WRITE_BINARY);
if (!n)
{
pthread_mutex_unlock(&websocket_output.mutex);
lwsl_err("ERROR %d writing to socket\n", n);
return -1;
}
user_session->last_sequence_id = websocket_output.sequence_id;
}
pthread_mutex_unlock(&websocket_output.mutex);
break;
case LWS_CALLBACK_RECEIVE:
/* Not expecting to receive anything */
break;
default:
break;
}
return 0;
}
int callback_fft_f5oeoplutofw(struct lws *wsi, enum lws_callback_reasons reason, void *user, void *in, size_t len)
{
(void)in;
(void)len;
int32_t n;
websocket_user_session_t *user_session = (websocket_user_session_t *)user;
websocket_vhost_session_t *vhost_session =
(websocket_vhost_session_t *)
lws_protocol_vh_priv_get(lws_get_vhost(wsi),
lws_get_protocol(wsi));
switch (reason)
{
case LWS_CALLBACK_PROTOCOL_INIT:
vhost_session = lws_protocol_vh_priv_zalloc(lws_get_vhost(wsi),
lws_get_protocol(wsi),
sizeof(websocket_vhost_session_t));
vhost_session->context = lws_get_context(wsi);
vhost_session->protocol = lws_get_protocol(wsi);
vhost_session->vhost = lws_get_vhost(wsi);
break;
case LWS_CALLBACK_ESTABLISHED:
/* add ourselves to the list of live pss held in the vhd */
lws_ll_fwd_insert(
user_session,
websocket_user_session_list,
vhost_session->websocket_user_session_list
);
user_session->wsi = wsi;
/* Update connection count */
n = 0;
lws_start_foreach_ll(websocket_user_session_t *, ___pss, vhost_session->websocket_user_session_list) {
n++;
} lws_end_foreach_ll(___pss, websocket_user_session_list);
lws_count_fft_f5oeoplutofw = n;
break;
case LWS_CALLBACK_CLOSED:
/* remove our closing pss from the list of live pss */
lws_ll_fwd_remove(
websocket_user_session_t,
websocket_user_session_list,
user_session,
vhost_session->websocket_user_session_list
);
/* Update connection count */
n = 0;
lws_start_foreach_ll(websocket_user_session_t *, ___pss, vhost_session->websocket_user_session_list) {
n++;
} lws_end_foreach_ll(___pss, websocket_user_session_list);
lws_count_fft_f5oeoplutofw = n;
break;
case LWS_CALLBACK_SERVER_WRITEABLE:
/* Write output data, if data exists */
pthread_mutex_lock(&websocket_output.mutex);
if(websocket_output.length != 0 && user_session->last_sequence_id != websocket_output.sequence_id)
{
n = lws_write(wsi, (unsigned char*)&websocket_output.buffer[LWS_PRE], websocket_output.length, LWS_WRITE_BINARY);
if (!n)
{
pthread_mutex_unlock(&websocket_output.mutex);
lwsl_err("ERROR %d writing to socket\n", n);
return -1;
}
user_session->last_sequence_id = websocket_output.sequence_id;
}
pthread_mutex_unlock(&websocket_output.mutex);
break;
case LWS_CALLBACK_RECEIVE:
/* Not expecting to receive anything */
break;
default:
break;
}
return 0;
}
int callback_fft_ea7kirsatcontroller(struct lws *wsi, enum lws_callback_reasons reason, void *user, void *in, size_t len)
{
(void)in;
(void)len;
int32_t n;
websocket_user_session_t *user_session = (websocket_user_session_t *)user;
websocket_vhost_session_t *vhost_session =
(websocket_vhost_session_t *)
lws_protocol_vh_priv_get(lws_get_vhost(wsi),
lws_get_protocol(wsi));
switch (reason)
{
case LWS_CALLBACK_PROTOCOL_INIT:
vhost_session = lws_protocol_vh_priv_zalloc(lws_get_vhost(wsi),
lws_get_protocol(wsi),
sizeof(websocket_vhost_session_t));
vhost_session->context = lws_get_context(wsi);
vhost_session->protocol = lws_get_protocol(wsi);
vhost_session->vhost = lws_get_vhost(wsi);
break;
case LWS_CALLBACK_ESTABLISHED:
/* add ourselves to the list of live pss held in the vhd */
lws_ll_fwd_insert(
user_session,
websocket_user_session_list,
vhost_session->websocket_user_session_list
);
user_session->wsi = wsi;
/* Update connection count */
n = 0;
lws_start_foreach_ll(websocket_user_session_t *, ___pss, vhost_session->websocket_user_session_list) {
n++;
} lws_end_foreach_ll(___pss, websocket_user_session_list);
lws_count_fft_ea7kirsatcontroller = n;
break;
case LWS_CALLBACK_CLOSED:
/* remove our closing pss from the list of live pss */
lws_ll_fwd_remove(
websocket_user_session_t,
websocket_user_session_list,
user_session,
vhost_session->websocket_user_session_list
);
/* Update connection count */
n = 0;
lws_start_foreach_ll(websocket_user_session_t *, ___pss, vhost_session->websocket_user_session_list) {
n++;
} lws_end_foreach_ll(___pss, websocket_user_session_list);
lws_count_fft_ea7kirsatcontroller = n;
break;
case LWS_CALLBACK_SERVER_WRITEABLE:
/* Write output data, if data exists */
pthread_mutex_lock(&websocket_output.mutex);
if(websocket_output.length != 0 && user_session->last_sequence_id != websocket_output.sequence_id)
{
n = lws_write(wsi, (unsigned char*)&websocket_output.buffer[LWS_PRE], websocket_output.length, LWS_WRITE_BINARY);
if (!n)
{
pthread_mutex_unlock(&websocket_output.mutex);
lwsl_err("ERROR %d writing to socket\n", n);
return -1;
}
user_session->last_sequence_id = websocket_output.sequence_id;
}
pthread_mutex_unlock(&websocket_output.mutex);
break;
case LWS_CALLBACK_RECEIVE:
/* Not expecting to receive anything */
break;
default:
break;
}
return 0;
}
int callback_fft_fast(struct lws *wsi, enum lws_callback_reasons reason, void *user, void *in, size_t len)
{
(void)in;
(void)len;
int32_t n;
websocket_user_session_t *user_session = (websocket_user_session_t *)user;
websocket_vhost_session_t *vhost_session =
(websocket_vhost_session_t *)
lws_protocol_vh_priv_get(lws_get_vhost(wsi),
lws_get_protocol(wsi));
switch (reason)
{
case LWS_CALLBACK_PROTOCOL_INIT:
vhost_session = lws_protocol_vh_priv_zalloc(lws_get_vhost(wsi),
lws_get_protocol(wsi),
sizeof(websocket_vhost_session_t));
vhost_session->context = lws_get_context(wsi);
vhost_session->protocol = lws_get_protocol(wsi);
vhost_session->vhost = lws_get_vhost(wsi);
break;
case LWS_CALLBACK_ESTABLISHED:
/* add ourselves to the list of live pss held in the vhd */
lws_ll_fwd_insert(
user_session,
websocket_user_session_list,
vhost_session->websocket_user_session_list
);
user_session->wsi = wsi;
/* Update connection count */
n = 0;
lws_start_foreach_ll(websocket_user_session_t *, ___pss, vhost_session->websocket_user_session_list) {
n++;
} lws_end_foreach_ll(___pss, websocket_user_session_list);
lws_count_fft_fast = n;
break;
case LWS_CALLBACK_CLOSED:
/* remove our closing pss from the list of live pss */
lws_ll_fwd_remove(
websocket_user_session_t,
websocket_user_session_list,
user_session,
vhost_session->websocket_user_session_list
);
/* Update connection count */
n = 0;
lws_start_foreach_ll(websocket_user_session_t *, ___pss, vhost_session->websocket_user_session_list) {
n++;
} lws_end_foreach_ll(___pss, websocket_user_session_list);
lws_count_fft_fast = n;
break;
case LWS_CALLBACK_SERVER_WRITEABLE:
/* Write output data, if data exists */
pthread_mutex_lock(&websocket_output_fast.mutex);
if(websocket_output_fast.length != 0 && user_session->last_sequence_id != websocket_output_fast.sequence_id)
{
n = lws_write(wsi, (unsigned char*)&websocket_output_fast.buffer[LWS_PRE], websocket_output_fast.length, LWS_WRITE_BINARY);
if (!n)
{
pthread_mutex_unlock(&websocket_output_fast.mutex);
lwsl_err("ERROR %d writing to socket\n", n);
return -1;
}
user_session->last_sequence_id = websocket_output_fast.sequence_id;
}
pthread_mutex_unlock(&websocket_output_fast.mutex);
break;
case LWS_CALLBACK_RECEIVE:
/* Not expecting to receive anything */
break;
default:
break;
}
return 0;
}
enum demo_protocols {
PROTOCOL_FFT,
PROTOCOL_FFT_M0DTSLIVETUNE,
PROTOCOL_FFT_F5OEOPLUTOFW,
PROTOCOL_FFT_EA7KIRSATCONTROLLER,
PROTOCOL_FFT_FAST,
NOP
};
/* list of supported protocols and callbacks */
static struct lws_protocols protocols[] = {
{
.name = "fft",
.callback = callback_fft,
.per_session_data_size = 128,
.rx_buffer_size = 4096,
},
{
.name = "fft_m0dtslivetune",
.callback = callback_fft_modtslivetune,
.per_session_data_size = 128,
.rx_buffer_size = 4096,
},
{
.name = "fft_f5oeoplutofw",
.callback = callback_fft_f5oeoplutofw,
.per_session_data_size = 128,
.rx_buffer_size = 4096,
},
{
.name = "fft_ea7kirsatcontroller",
.callback = callback_fft_ea7kirsatcontroller,
.per_session_data_size = 128,
.rx_buffer_size = 4096,
},
{
.name = "fft_fast",
.callback = callback_fft_fast,
.per_session_data_size = 128,
.rx_buffer_size = 4096,
},
{
/* terminator */
0
}
};
int lws_err = 0;
/* Websocket Service Thread */
void *thread_ws(void *dummy)
{
(void) dummy;
while(!(lws_err < 0) && !force_exit)
{
lws_err = lws_service(context, 0);
}
return NULL;
}
void sighandler(int sig)
{
(void) sig;
force_exit = 1;
lws_cancel_service(context);
}
int main(int argc, char **argv)
{
(void) argc;
(void) argv;
struct lws_context_creation_info info;
struct timeval tv;
unsigned int ms, oldms = 0, oldms_fast = 0, oldms_conn_count = 0;
int i;
signal(SIGINT, sighandler);
/* we will only try to log things according to our debug_level */
setlogmask(LOG_UPTO (LOG_DEBUG));
openlog("lwsts", LOG_PID | LOG_PERROR, LOG_DAEMON);
/* tell the library what debug level to emit and to send it to syslog */
lws_set_log_level(debug_level, lwsl_emit_syslog);
memset(&info, 0, sizeof info);
info.port = WS_PORT;
info.iface = NULL;
info.protocols = protocols;
info.gid = -1;
info.uid = -1;
info.max_http_header_pool = 16;
info.options = LWS_SERVER_OPTION_VALIDATE_UTF8;
info.timeout_secs = 5;
fprintf(stdout, "Initialising FFT (%d bin).. ", FFT_SIZE);
fflush(stdout);
setup_fft();
for(i=0; i<FFT_SIZE; i++)
{
hanning_window_const[i] = 0.5 * (1.0 - cos(2*M_PI*(((double)i)/FFT_SIZE)));
}
fprintf(stdout, "Done.\n");
fprintf(stdout, "Initialising Websocket Server (LWS %d) on port %d.. ",LWS_LIBRARY_VERSION_NUMBER,info.port);
fflush(stdout);