/*! \brief Public contructor.
* \param input_device Input device specifier.
* \param audio_device Audio output device specifier,
* e.g. hw:0 when using ALSA or Portaudio.
*
* \todo Option to use UHD device instead of FCD.
*/
receiver::receiver(const std::string input_device, const std::string audio_device)
: d_running(false),
d_input_rate(96000.0),
d_audio_rate(48000),
d_rf_freq(144800000.0),
d_filter_offset(0.0),
d_recording_wav(false),
d_sniffer_active(false),
d_iq_rev(false),
d_dc_cancel(false),
d_iq_balance(false),
d_demod(RX_DEMOD_OFF)
{
tb = gr_make_top_block("gqrx");
if (input_device.empty())
{
// FIXME: other OS
src = osmosdr_make_source_c("file=/dev/random,freq=428e6,rate=96000,repeat=true,throttle=true");
}
else
{
input_devstr = input_device;
src = osmosdr_make_source_c(input_device);
}
rx = make_nbrx(d_input_rate, d_audio_rate);
lo = gr_make_sig_source_c(d_input_rate, GR_SIN_WAVE, 0.0, 1.0);
mixer = gr_make_multiply_cc();
iq_swap = make_iq_swap_cc(false);
dc_corr = make_dc_corr_cc(d_input_rate, 1.0);
iq_fft = make_rx_fft_c(4096u, 0);
audio_fft = make_rx_fft_f(3072u);
audio_gain0 = gr_make_multiply_const_ff(0.1);
audio_gain1 = gr_make_multiply_const_ff(0.1);
#ifdef WITH_PULSEAUDIO //pafix
audio_snk = make_pa_sink(audio_device, d_audio_rate, "GQRX", "Audio output");
#else
audio_snk = audio_make_sink(d_audio_rate, audio_device, true);
#endif
output_devstr = audio_device;
/* wav sink and source is created when rec/play is started */
audio_null_sink = gr_make_null_sink(sizeof(float));
sniffer = make_sniffer_f();
/* sniffer_rr is created at each activation. */
set_demod(RX_DEMOD_NFM);
}
TopBlock(double centre_freq_1, double centre_freq_2, double sample_rate, double fft_width, double bandwidth1, double bandwidth2,
double step, unsigned int avg_size, double spread, double threshold, double ptime, float gain, float ppm) : gr_top_block("Top Block"),
vector_length(sample_rate/fft_width),
window(GetWindow(vector_length)),
source(osmosdr_make_source_c()), /* OsmoSDR Source */
stv(gr_make_stream_to_vector(sizeof(float)*2, vector_length)), /* Stream to vector */
/* Based on the logpwrfft (a block implemented in python) */
fft(gr_make_fft_vcc_fftw(vector_length, true, window, false, 1)),
ctf(gr_make_complex_to_mag_squared(vector_length)),
iir(gr_make_single_pole_iir_filter_ff(1.0, vector_length)),
lg(gr_make_nlog10_ff(10, vector_length, -20 * log10(vector_length) -10 * log10(GetWindowPower()/vector_length))),
/* Sink - this does most of the interesting work */
sink(make_scanner_sink(source, vector_length, centre_freq_1, centre_freq_2, sample_rate, bandwidth1, bandwidth2, step, avg_size, spread, threshold, ptime, gain, ppm))
{
/* Set up the OsmoSDR Source */
source->set_sample_rate(sample_rate);
source->set_center_freq(centre_freq_1);
source->set_freq_corr(ppm);
source->set_gain_mode(false);
source->set_gain(gain);
source->set_if_gain(20.0);
/* Set up the connections */
connect(source, 0, stv, 0);
connect(stv, 0, fft, 0);
connect(fft, 0, ctf, 0);
connect(ctf, 0, iir, 0);
connect(iir, 0, lg, 0);
connect(lg, 0, sink, 0);
}
TopBlock(double centerFreq, double sampleRate, double freqRes, double cycFreqRes, std::string fileName) :
gr_top_block("Top Block"),
Np(pow2roundup((int)sampleRate/freqRes)),
L(Np/4),
P(pow2roundup(sampleRate/cycFreqRes/L)),
N(P*L),
vector_length(N),
source(osmosdr_make_source_c()), /* OsmoSDR Source */
fileSource(gr_make_file_source(sizeof(float)*2, "/home/ylb/QAM16_44_1k.dat", false)),
stv(gr_make_stream_to_vector(sizeof(float)*2, vector_length)), /* Stream to vector */
/* autoFam - this does most of the interesting work */
sink(make_autofam_sink(source, vector_length, centerFreq, sampleRate, freqRes, cycFreqRes, fileName))
{
/* Set up the OsmoSDR Source */
source->set_sample_rate(sampleRate);
source->set_center_freq(centerFreq);
source->set_freq_corr(0.0);
source->set_gain_mode(false);
source->set_gain(30);
source->set_if_gain(25.0);
/* Set up the connections */
connect(fileSource, 0, stv, 0);
connect(stv, 0, sink, 0);
}
/*! \brief Select new input device.
*
* \bug When using ALSA, program will crash if the new device
* is the same as the previously used device:
* audio_alsa_source[hw:1]: Device or resource busy
*/
void receiver::set_input_device(const std::string device)
{
if (device.empty())
return;
if (input_devstr.compare(device) == 0)
{
#ifndef QT_NO_DEBUG_OUTPUT
std::cout << "No change in input device:" << std::endl
<< " old: " << input_devstr << std::endl
<< " new: " << device << std::endl;
#endif
return;
}
input_devstr = device;
tb->lock();
tb->disconnect(src, 0, iq_swap, 0);
src.reset();
src = osmosdr_make_source_c(device);
tb->connect(src, 0, iq_swap, 0);
tb->unlock();
}