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ofdm-transfer.c
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ofdm-transfer.c
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/*
This file is part of ofdm-transfer, a program to send or receive data
by software defined radio using the OFDM modulation.
Copyright 2021-2022 Guillaume LE VAILLANT
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <complex.h>
#include <fcntl.h>
#include <liquid/liquid.h>
#include <math.h>
#include <signal.h>
#include <SoapySDR/Device.h>
#include <SoapySDR/Formats.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <strings.h>
#include <time.h>
#include <unistd.h>
#include "gettext.h"
#include "ofdm-transfer.h"
#define TAU (2 * M_PI)
#define MIN(x, y) ((x < y) ? x : y)
#define MAX(x, y) ((x > y) ? x : y)
#define _(string) gettext(string)
#define SOAPYSDR_CHECK(funcall) \
{ \
int e = funcall; \
if(e != 0) \
{ \
fprintf(stderr, _("Error: %s\n"), SoapySDRDevice_lastError()); \
exit(EXIT_FAILURE); \
} \
}
typedef enum
{
IO,
FILENAME,
SOAPYSDR
} radio_type_t;
typedef union
{
FILE *file;
SoapySDRDevice *soapysdr;
} radio_device_t;
typedef union
{
SoapySDRStream *soapysdr;
} radio_stream_t;
struct ofdm_transfer_s
{
radio_type_t radio_type;
radio_device_t radio_device;
radio_stream_t radio_stream;
unsigned char emit;
FILE *file;
unsigned long int sample_rate;
unsigned int bit_rate;
unsigned long int frequency;
long int frequency_offset;
modulation_scheme subcarrier_modulation;
unsigned int subcarriers;
unsigned int cyclic_prefix_length;
unsigned int taper_length;
crc_scheme crc;
fec_scheme inner_fec;
fec_scheme outer_fec;
char id[5];
FILE *dump;
unsigned char stop;
int (*data_callback)(void *, unsigned char *, unsigned int);
void *callback_context;
unsigned int timeout;
time_t timeout_start;
firhilbf audio_converter;
float audio_gain;
};
unsigned char stop = 0;
unsigned char verbose = 0;
void ofdm_transfer_set_verbose(unsigned char v)
{
verbose = v;
}
unsigned char ofdm_transfer_is_verbose()
{
return(verbose);
}
void dump_samples(ofdm_transfer_t transfer,
complex float *samples,
unsigned int samples_size)
{
fwrite(samples, sizeof(complex float), samples_size, transfer->dump);
}
int read_data(void *context,
unsigned char *payload,
unsigned int payload_size)
{
ofdm_transfer_t transfer = (ofdm_transfer_t) context;
int n;
if(feof(transfer->file))
{
return(-1);
}
n = fread(payload, 1, payload_size, transfer->file);
if(n == 0)
{
usleep(1);
}
return(n);
}
int write_data(void *context,
unsigned char *payload,
unsigned int payload_size)
{
ofdm_transfer_t transfer = (ofdm_transfer_t) context;
fwrite(payload, 1, payload_size, transfer->file);
if(transfer->file == stdout)
{
fflush(transfer->file);
}
return(payload_size);
}
void write_audio(ofdm_transfer_t transfer,
complex float *samples,
unsigned int samples_size,
FILE *output)
{
float gain = transfer->audio_gain;
unsigned int n;
float audio_samples[2];
short int audio_samples_s16[2];
for(n = 0; n < samples_size; n++)
{
firhilbf_interp_execute(transfer->audio_converter,
samples[n],
audio_samples);
audio_samples_s16[0] = (audio_samples[0] * gain) * 32767;
audio_samples_s16[1] = (audio_samples[1] * gain) * 32767;
fwrite(audio_samples_s16, sizeof(short int), 2, output);
}
}
unsigned int read_audio(ofdm_transfer_t transfer,
complex float *samples,
unsigned int samples_size,
FILE* input)
{
float gain = transfer->audio_gain;
unsigned int n = 0;
float audio_samples[2];
short int audio_samples_s16[2];
while((n < samples_size) &&
(fread(audio_samples_s16, sizeof(short int), 2, input) == 2))
{
audio_samples[0] = (audio_samples_s16[0] * gain) / 32768.0;
audio_samples[1] = (audio_samples_s16[1] * gain) / 32768.0;
firhilbf_decim_execute(transfer->audio_converter,
audio_samples,
&samples[n]);
n++;
}
return(n);
}
void send_to_radio(ofdm_transfer_t transfer,
complex float *samples,
unsigned int samples_size,
int last)
{
unsigned int n;
unsigned int size;
int flags = 0;
size_t mask = 0;
long long int timestamp = 0;
int r;
const void *buffers[1];
if(transfer->dump)
{
dump_samples(transfer, samples, samples_size);
}
switch(transfer->radio_type)
{
case IO:
if(transfer->audio_converter)
{
write_audio(transfer, samples, samples_size, stdout);
}
else
{
fwrite(samples, sizeof(complex float), samples_size, stdout);
}
break;
case FILENAME:
if(transfer->audio_converter)
{
write_audio(transfer, samples, samples_size, transfer->radio_device.file);
}
else
{
fwrite(samples,
sizeof(complex float),
samples_size,
transfer->radio_device.file);
}
break;
case SOAPYSDR:
n = 0;
while((n < samples_size) && (!stop) && (!transfer->stop))
{
buffers[0] = &samples[n];
size = samples_size - n;
r = SoapySDRDevice_writeStream(transfer->radio_device.soapysdr,
transfer->radio_stream.soapysdr,
buffers,
size,
&flags,
0,
10000);
if(r > 0)
{
n += r;
}
}
if(last)
{
/* Complete the remaining buffer to ensure that SoapySDR
* will process it */
flags = SOAPY_SDR_END_BURST;
size = SoapySDRDevice_getStreamMTU(transfer->radio_device.soapysdr,
transfer->radio_stream.soapysdr);
bzero(samples, samples_size * sizeof(complex float));
buffers[0] = samples;
while((size > 0) && (!stop) && (!transfer->stop))
{
n = (samples_size < size) ? samples_size : size;
r = SoapySDRDevice_writeStream(transfer->radio_device.soapysdr,
transfer->radio_stream.soapysdr,
buffers,
n,
&flags,
0,
10000);
if(r > 0)
{
size -= r;
}
}
do
{
r = SoapySDRDevice_readStreamStatus(transfer->radio_device.soapysdr,
transfer->radio_stream.soapysdr,
&mask,
&flags,
×tamp,
10000);
}
while((r != SOAPY_SDR_UNDERFLOW) && (!stop) && (!transfer->stop));
}
break;
}
}
unsigned int receive_from_radio(ofdm_transfer_t transfer,
complex float *samples,
unsigned int samples_size)
{
unsigned int n = 0;
int flags;
long long int timestamp;
int r;
void *buffers[1];
switch(transfer->radio_type)
{
case IO:
if(transfer->audio_converter)
{
n = read_audio(transfer, samples, samples_size, stdin);
}
else
{
n = fread(samples, sizeof(complex float), samples_size, stdin);
}
break;
case FILENAME:
if(transfer->audio_converter)
{
n = read_audio(transfer,
samples,
samples_size,
transfer->radio_device.file);
}
else
{
n = fread(samples,
sizeof(complex float),
samples_size,
transfer->radio_device.file);
}
break;
case SOAPYSDR:
buffers[0] = samples;
r = SoapySDRDevice_readStream(transfer->radio_device.soapysdr,
transfer->radio_stream.soapysdr,
buffers,
samples_size,
&flags,
×tamp,
10000);
if(r >= 0)
{
n = r;
}
break;
}
return(n);
}
unsigned int bits_per_symbol(modulation_scheme modulation)
{
unsigned int n;
switch(modulation)
{
case LIQUID_MODEM_BPSK:
n = 1;
break;
case LIQUID_MODEM_QPSK:
n = 2;
break;
case LIQUID_MODEM_PSK8:
n = 3;
break;
case LIQUID_MODEM_APSK16:
n = 4;
break;
case LIQUID_MODEM_APSK32:
n = 5;
break;
case LIQUID_MODEM_APSK64:
n = 6;
break;
case LIQUID_MODEM_APSK128:
n = 7;
break;
case LIQUID_MODEM_APSK256:
n = 8;
break;
default:
n = 1;
break;
}
return(n);
}
void set_counter(unsigned char *header, unsigned int counter)
{
header[4] = (counter >> 24) & 255;
header[5] = (counter >> 16) & 255;
header[6] = (counter >> 8) & 255;
header[7] = counter & 255;
}
unsigned int get_counter(unsigned char *header)
{
return((header[4] << 24) | (header[5] << 16) | (header[6] << 8) | header[7]);
}
void send_dummy_samples(ofdm_transfer_t transfer,
msresamp_crcf resampler,
nco_crcf oscillator,
complex float *samples,
unsigned int delay,
int last)
{
unsigned int i;
unsigned int n;
complex float zero_sample = 0;
for(i = 0; i < delay; i++)
{
msresamp_crcf_execute(resampler, &zero_sample, 1, samples, &n);
if(transfer->frequency_offset != 0)
{
nco_crcf_mix_block_up(oscillator, samples, samples, n);
}
if(i + 1 < delay)
{
send_to_radio(transfer, samples, n, 0);
}
else
{
send_to_radio(transfer, samples, n, last);
}
}
}
void send_frames(ofdm_transfer_t transfer)
{
unsigned int subcarrier_symbol_bits = bits_per_symbol(transfer->subcarrier_modulation);
float samples_per_bit = 2.0 / subcarrier_symbol_bits;
ofdmflexframegenprops_s frame_properties;
ofdmflexframegen frame_generator;
float resampling_ratio = (float) transfer->sample_rate / (transfer->bit_rate *
samples_per_bit);
msresamp_crcf resampler = msresamp_crcf_create(resampling_ratio, 60);
unsigned int delay = ceilf(msresamp_crcf_get_delay(resampler));
unsigned int header_size = 8;
unsigned char header[header_size];
/* Try to make frames of approximately 100 ms, but containing at least
* 16 bytes and at most 8000 bytes of payload */
unsigned int byte_rate = transfer->bit_rate / 8;
unsigned int payload_size = MIN(MAX(byte_rate * 0.1, 16), 8000);
int r;
unsigned int n;
unsigned int i;
/* Process data by blocks of 50 ms */
unsigned int frame_samples_size = ceilf((transfer->bit_rate *
samples_per_bit) / 20.0);
unsigned int samples_size = ceilf((frame_samples_size + delay) * resampling_ratio);
int frame_complete;
float center_frequency = (float) transfer->frequency_offset / transfer->sample_rate;
nco_crcf oscillator = nco_crcf_create(LIQUID_NCO);
float maximum_amplitude = 1;
unsigned int counter = 0;
unsigned char *payload = malloc(payload_size);
complex float *frame_samples = malloc(frame_samples_size * sizeof(complex float));
complex float *samples = malloc(samples_size * sizeof(complex float));
if((payload == NULL) || (frame_samples == NULL) || (samples == NULL))
{
fprintf(stderr, _("Error: Memory allocation failed\n"));
exit(EXIT_FAILURE);
}
nco_crcf_set_phase(oscillator, 0);
nco_crcf_set_frequency(oscillator, TAU * center_frequency);
ofdmflexframegenprops_init_default(&frame_properties);
frame_properties.check = transfer->crc;
frame_properties.fec0 = transfer->inner_fec;
frame_properties.fec1 = transfer->outer_fec;
frame_properties.mod_scheme = transfer->subcarrier_modulation;
frame_generator = ofdmflexframegen_create(transfer->subcarriers,
transfer->cyclic_prefix_length,
transfer->taper_length,
NULL,
&frame_properties);
ofdmflexframegen_set_header_props(frame_generator, &frame_properties);
ofdmflexframegen_set_header_len(frame_generator, header_size);
memcpy(header, transfer->id, 4);
set_counter(header, counter);
while((!stop) && (!transfer->stop))
{
r = transfer->data_callback(transfer->callback_context, payload, payload_size);
if(r < 0)
{
break;
}
n = r;
if(n > 0)
{
ofdmflexframegen_assemble(frame_generator, header, payload, n);
frame_complete = 0;
while(!frame_complete)
{
frame_complete = ofdmflexframegen_write(frame_generator,
frame_samples,
frame_samples_size);
n = frame_samples_size;
if(frame_complete)
{
/* Don't send the padding 0 bytes */
while((n > 0) && (frame_samples[n - 1] == 0))
{
n--;
}
}
/* Reduce the amplitude of samples because the frame generator and
* the resampler may produce samples with an amplitude greater than
* 1.0 depending on the number of carriers and resampling ratio */
maximum_amplitude = 1;
for(i = 0; i < n; i++)
{
if(cabsf(frame_samples[i]) > maximum_amplitude)
{
maximum_amplitude = cabsf(frame_samples[i]);
}
}
liquid_vectorcf_mulscalar(frame_samples,
n,
0.75 / maximum_amplitude,
frame_samples);
msresamp_crcf_execute(resampler, frame_samples, n, samples, &n);
if(transfer->frequency_offset != 0)
{
nco_crcf_mix_block_up(oscillator, samples, samples, n);
}
send_to_radio(transfer, samples, n, 0);
}
counter++;
set_counter(header, counter);
}
else
{
/* Underrun when reading from stdin. Send some dummy samples to get the
* remaining output samples for the end of current frame (because of
* resampler and filter delays) and send them */
send_dummy_samples(transfer,
resampler,
oscillator,
samples,
delay,
0);
}
}
/* Send some dummy samples to get the remaining output samples (because of
* resampler and filter delays) */
send_dummy_samples(transfer,
resampler,
oscillator,
samples,
delay,
1);
free(samples);
free(frame_samples);
free(payload);
nco_crcf_destroy(oscillator);
msresamp_crcf_destroy(resampler);
ofdmflexframegen_destroy(frame_generator);
}
int frame_received(unsigned char *header,
int header_valid,
unsigned char *payload,
unsigned int payload_size,
int payload_valid,
framesyncstats_s stats,
void *user_data)
{
ofdm_transfer_t transfer = (ofdm_transfer_t) user_data;
char id[5];
unsigned int counter;
transfer->timeout_start = time(NULL);
memcpy(id, header, 4);
id[4] = '\0';
counter = get_counter(header);
if(!header_valid || !payload_valid)
{
if(verbose)
{
if(!header_valid)
{
fprintf(stderr, _("Frame %u for '%s': corrupted header\n"), counter, id);
}
if(!payload_valid)
{
fprintf(stderr, _("Frame %u for '%s': corrupted payload\n"), counter, id);
}
fflush(stderr);
}
}
else if(memcmp(id, transfer->id, 4) != 0)
{
if(verbose)
{
fprintf(stderr, _("Frame %u for '%s': ignored\n"), counter, id);
fflush(stderr);
}
}
else
{
transfer->data_callback(transfer->callback_context, payload, payload_size);
}
return(0);
}
void receive_frames(ofdm_transfer_t transfer)
{
unsigned int subcarrier_symbol_bits = bits_per_symbol(transfer->subcarrier_modulation);
float samples_per_bit = 2.0 / subcarrier_symbol_bits;
ofdmflexframegenprops_s frame_properties;
ofdmflexframesync frame_synchronizer;
float resampling_ratio = (transfer->bit_rate *
samples_per_bit) / (float) transfer->sample_rate;
msresamp_crcf resampler = msresamp_crcf_create(resampling_ratio, 60);
unsigned int delay = ceilf(msresamp_crcf_get_delay(resampler));
unsigned int header_size = 8;
unsigned int n;
/* Process data by blocks of 50 ms */
unsigned int frame_samples_size = ceilf((transfer->bit_rate *
samples_per_bit) / 20.0);
unsigned int samples_size = floorf(frame_samples_size / resampling_ratio);
nco_crcf oscillator = nco_crcf_create(LIQUID_NCO);
complex float *frame_samples = malloc((frame_samples_size + delay) *
sizeof(complex float));
complex float *samples = malloc((samples_size + delay) *
sizeof(complex float));
if((frame_samples == NULL) || (samples == NULL))
{
fprintf(stderr, _("Error: Memory allocation failed\n"));
exit(EXIT_FAILURE);
}
nco_crcf_set_phase(oscillator, 0);
nco_crcf_set_frequency(oscillator, TAU * ((float) transfer->frequency_offset /
transfer->sample_rate));
frame_synchronizer = ofdmflexframesync_create(transfer->subcarriers,
transfer->cyclic_prefix_length,
transfer->taper_length,
NULL,
frame_received,
transfer);
frame_properties.check = transfer->crc;
frame_properties.fec0 = transfer->inner_fec;
frame_properties.fec1 = transfer->outer_fec;
frame_properties.mod_scheme = transfer->subcarrier_modulation;
ofdmflexframesync_set_header_props(frame_synchronizer, &frame_properties);
ofdmflexframesync_set_header_len(frame_synchronizer, header_size);
while((!stop) && (!transfer->stop))
{
n = receive_from_radio(transfer, samples, samples_size);
if((n == 0) &&
((transfer->radio_type == IO) || (transfer->radio_type == FILENAME)))
{
break;
}
if((transfer->timeout > 0) &&
(time(NULL) > transfer->timeout_start + transfer->timeout))
{
if(verbose)
{
fprintf(stderr, _("Timeout: %d s without frames\n"), transfer->timeout);
}
break;
}
if(transfer->dump)
{
dump_samples(transfer, samples, n);
}
if(transfer->frequency_offset != 0)
{
nco_crcf_mix_block_down(oscillator, samples, samples, n);
}
msresamp_crcf_execute(resampler, samples, n, frame_samples, &n);
ofdmflexframesync_execute(frame_synchronizer, frame_samples, n);
}
for(n = 0; n < delay; n++)
{
samples[n] = 0;
}
msresamp_crcf_execute(resampler, samples, delay, frame_samples, &n);
ofdmflexframesync_execute(frame_synchronizer, frame_samples, n);
while(ofdmflexframesync_is_frame_open(frame_synchronizer))
{
ofdmflexframesync_execute(frame_synchronizer, samples, 1);
}
free(samples);
free(frame_samples);
nco_crcf_destroy(oscillator);
msresamp_crcf_destroy(resampler);
ofdmflexframesync_destroy(frame_synchronizer);
}
ofdm_transfer_t ofdm_transfer_create_callback(char *radio_driver,
unsigned char emit,
int (*data_callback)(void *,
unsigned char *,
unsigned int),
void *callback_context,
unsigned long int sample_rate,
unsigned int bit_rate,
unsigned long int frequency,
long int frequency_offset,
char *gain,
float ppm,
char *subcarrier_modulation,
unsigned int subcarriers,
unsigned int cyclic_prefix_length,
unsigned int taper_length,
char *inner_fec,
char *outer_fec,
char *id,
char *dump,
unsigned int timeout,
unsigned char audio)
{
int direction;
SoapySDRKwargs kwargs;
unsigned int n;
char *gain_name;
int gain_value;
ofdm_transfer_t transfer = malloc(sizeof(struct ofdm_transfer_s));
if(transfer == NULL)
{
fprintf(stderr, _("Error: Memory allocation failed\n"));
return(NULL);
}
bzero(transfer, sizeof(struct ofdm_transfer_s));
if(strcasecmp(radio_driver, "io") == 0)
{
transfer->radio_type = IO;
}
else if(strncasecmp(radio_driver, "file=", 5) == 0)
{
transfer->radio_type = FILENAME;
}
else
{
transfer->radio_type = SOAPYSDR;
}
transfer->stop = 0;
transfer->emit = emit;
transfer->file = NULL;
transfer->data_callback = data_callback;
transfer->callback_context = callback_context;
if(sample_rate != 0)
{
transfer->sample_rate = sample_rate * ((1000000.0 - ppm) / 1000000.0);
}
else
{
fprintf(stderr, _("Error: Invalid sample rate\n"));
free(transfer);
return(NULL);
}
if(frequency != 0)
{
transfer->frequency = frequency * ((1000000.0 - ppm) / 1000000.0);
}
else
{
fprintf(stderr, _("Error: Invalid frequency\n"));
free(transfer);
return(NULL);
}
transfer->frequency_offset = frequency_offset;
if(audio)
{
if((transfer->radio_type == IO) || (transfer->radio_type == FILENAME))
{
transfer->audio_converter = firhilbf_create(25, 60);
/* The rate of audio samples is twice the rate of IQ samples */
transfer->sample_rate = transfer->sample_rate / 2;
/* -(sample_rate / 2) Hz IQ <=> 0 Hz audio
* (sample_rate / 2) Hz IQ <=> (sample_rate * 2) Hz audio */
transfer->frequency_offset = transfer->frequency - (transfer->sample_rate / 2);
transfer->frequency = 0;
gain_value = strtol(gain, NULL, 10);
transfer->audio_gain = powf(10, gain_value / 20.0);
}
else
{
fprintf(stderr, _("Error: This radio type only supports IQ samples\n"));
free(transfer);
return(NULL);
}
}
else
{
transfer->audio_converter = NULL;
transfer->audio_gain = 0;
}
if(bit_rate != 0)
{
transfer->bit_rate = bit_rate;
}
else
{
fprintf(stderr, _("Error: Invalid bit rate\n"));
free(transfer);
return(NULL);
}
transfer->subcarrier_modulation = liquid_getopt_str2mod(subcarrier_modulation);
switch(transfer->subcarrier_modulation)
{
case LIQUID_MODEM_BPSK:
case LIQUID_MODEM_QPSK:
case LIQUID_MODEM_PSK8:
case LIQUID_MODEM_APSK16:
case LIQUID_MODEM_APSK32:
case LIQUID_MODEM_APSK64:
case LIQUID_MODEM_APSK128:
case LIQUID_MODEM_APSK256:
break;
default:
fprintf(stderr, _("Error: Invalid subcarrier modulation\n"));
free(transfer);
return(NULL);
}
if(subcarriers != 0)
{
transfer->subcarriers = subcarriers;
}
else
{
fprintf(stderr, _("Error: Invalid number of subcarriers\n"));
free(transfer);
return(NULL);
}
transfer->cyclic_prefix_length = cyclic_prefix_length;
transfer->taper_length = taper_length;
transfer->crc = LIQUID_CRC_32;
transfer->inner_fec = liquid_getopt_str2fec(inner_fec);
if(transfer->inner_fec == LIQUID_FEC_UNKNOWN)
{
fprintf(stderr, _("Error: Invalid inner FEC\n"));
free(transfer);
return(NULL);
}
transfer->outer_fec = liquid_getopt_str2fec(outer_fec);
if(transfer->outer_fec == LIQUID_FEC_UNKNOWN)
{
fprintf(stderr, _("Error: Invalid outer FEC\n"));
free(transfer);
return(NULL);
}
if(strlen(id) <= 4)
{
strcpy(transfer->id, id);
}
else
{
fprintf(stderr, _("Error: Id must be at most 4 bytes long\n"));
free(transfer);
return(NULL);
}
if(dump)
{
transfer->dump = fopen(dump, "wb");
if(transfer->dump == NULL)
{
fprintf(stderr, _("Error: Failed to open '%s'\n"), dump);
free(transfer);
return(NULL);
}
}
else
{
transfer->dump = NULL;
}
transfer->timeout = timeout;
switch(transfer->radio_type)
{
case IO:
break;
case FILENAME:
if(emit)
{
transfer->radio_device.file = fopen(radio_driver + 5, "wb");
}
else
{
transfer->radio_device.file = fopen(radio_driver + 5, "rb");
}
if(transfer->radio_device.file == NULL)
{
fprintf(stderr, _("Error: Failed to open '%s'\n"), radio_driver + 5);
free(transfer);
return(NULL);
}
break;
case SOAPYSDR:
transfer->radio_device.soapysdr = SoapySDRDevice_makeStrArgs(radio_driver);
if(transfer->radio_device.soapysdr == NULL)
{
fprintf(stderr, _("Error: %s\n"), SoapySDRDevice_lastError());
free(transfer);
return(NULL);
}
direction = emit ? SOAPY_SDR_TX : SOAPY_SDR_RX;
SOAPYSDR_CHECK(SoapySDRDevice_setSampleRate(transfer->radio_device.soapysdr,
direction,
0,
transfer->sample_rate));
SOAPYSDR_CHECK(SoapySDRDevice_setFrequency(transfer->radio_device.soapysdr,
direction,
0,
transfer->frequency - transfer->frequency_offset,
NULL));
if(strchr(gain, '='))
{
kwargs = SoapySDRKwargs_fromString(gain);
for(n = 0; n < kwargs.size; n++)
{
gain_name = kwargs.keys[n];
gain_value = strtoul(kwargs.vals[n], NULL, 10);
SOAPYSDR_CHECK(SoapySDRDevice_setGainElement(transfer->radio_device.soapysdr,
direction,
0,
gain_name,
gain_value));
}
SoapySDRKwargs_clear(&kwargs);
}
else
{
gain_value = strtoul(gain, NULL, 10);
SOAPYSDR_CHECK(SoapySDRDevice_setGain(transfer->radio_device.soapysdr,
direction,
0,
gain_value));
}
transfer->radio_stream.soapysdr = SoapySDRDevice_setupStream(transfer->radio_device.soapysdr,
direction,
SOAPY_SDR_CF32,
NULL,
0,
NULL);
if(transfer->radio_stream.soapysdr == NULL)
{
fprintf(stderr, _("Error: %s\n"), SoapySDRDevice_lastError());
SoapySDRDevice_unmake(transfer->radio_device.soapysdr);
free(transfer);
return(NULL);
}
break;
default:
fprintf(stderr, _("Error: Unknown radio type\n"));