/*! \brief Start data sniffer.
* \param buffsize The buffer that should be used in the sniffer.
* \return STATUS_OK if the sniffer was started, STATUS_ERROR if the sniffer is already in use.
*/
receiver::status receiver::start_sniffer(unsigned int samprate, int buffsize)
{
if (d_sniffer_active) {
/* sniffer already in use */
return STATUS_ERROR;
}
sniffer->set_buffer_size(buffsize);
sniffer_rr = make_resampler_ff((float)samprate/(float)d_audio_rate);
tb->lock();
tb->connect(rx, 0, sniffer_rr, 0);
tb->connect(sniffer_rr, 0, sniffer, 0);
tb->unlock();
d_sniffer_active = true;
return STATUS_OK;
}
/*! \brief Create stereo demodulator object.
*
* Use make_stereo_demod() instead.
*/
stereo_demod::stereo_demod(float input_rate, float audio_rate, bool stereo, bool oirt)
: gr::hier_block2("stereo_demod",
gr::io_signature::make (MIN_IN, MAX_IN, sizeof (float)),
gr::io_signature::make (MIN_OUT, MAX_OUT, sizeof (float))),
d_input_rate(input_rate),
d_audio_rate(audio_rate),
d_stereo(stereo),
d_oirt(oirt)
{
double cutof_freq = d_oirt ? 15e3 : 17e3;
lpf0 = make_lpf_ff(d_input_rate, cutof_freq, 2e3); // FIXME
audio_rr0 = make_resampler_ff(d_audio_rate/d_input_rate);
if (d_stereo)
{
lpf1 = make_lpf_ff(d_input_rate, cutof_freq, 2e3); // FIXME
audio_rr1 = make_resampler_ff(d_audio_rate/d_input_rate);
if (!d_oirt)
{
d_tone_taps = gr::filter::firdes::complex_band_pass(
1.0, // gain,
d_input_rate, // sampling_freq
18800., // low_cutoff_freq
19200., // high_cutoff_freq
300.); // transition_width
pll = gr::analog::pll_refout_cc::make(0.001, // loop_bw FIXME
2*M_PI * 19200 / input_rate, // max_freq
2*M_PI * 18800 / input_rate); // min_freq
subtone = gr::blocks::multiply_cc::make();
} else {
d_tone_taps = gr::filter::firdes::complex_band_pass(
1.0, // gain,
d_input_rate, // sampling_freq
31200., // low_cutoff_freq
31300., // high_cutoff_freq
100.); // transition_width
pll = gr::analog::pll_refout_cc::make(0.001, // loop_bw FIXME
2*M_PI * 31200 / input_rate, // max_freq
2*M_PI * 31300 / input_rate); // min_freq
}
tone = gr::filter::fir_filter_fcc::make(1, d_tone_taps);
lo = gr::blocks::complex_to_imag::make();
#ifdef STEREO_DEMOD_PARANOIC
d_pll_taps = gr::filter::firdes::band_pass(
1.0, // gain,
d_input_rate, // sampling_freq
37600., // low_cutoff_freq
38400., // high_cutoff_freq
400.); // transition_width
lo2 = gr::filter::fir_filter_fff::make(1, d_pll_taps);
#endif
mixer = gr::blocks::multiply_ff::make();
cdp = gr::blocks::multiply_const_ff::make( 5.5); // FIXME
cdm = gr::blocks::multiply_const_ff::make(-5.5); // FIXME
add0 = gr::blocks::add_ff::make();
add1 = gr::blocks::add_ff::make();
/* connect block */
if (!d_oirt) {
connect(self(), 0, tone, 0);
connect(tone, 0, pll, 0);
connect(pll, 0, subtone, 0);
connect(pll, 0, subtone, 1);
connect(subtone, 0, lo, 0);
#ifdef STEREO_DEMOD_PARANOIC
connect(lo, 0, lo2, 0);
connect(lo2, 0, mixer, 0);
#else
connect(lo, 0, mixer, 0);
#endif
} else {
connect(self(), 0, tone, 0);
connect(tone, 0, pll, 0);
connect(pll, 0, lo, 0);
connect(lo, 0, mixer, 0);
}
connect(self(), 0, mixer, 1);
connect(self(), 0, lpf0, 0);
connect(mixer, 0, lpf1, 0);
connect(lpf0, 0, audio_rr0, 0); // sum
connect(lpf1, 0, audio_rr1, 0);
connect(audio_rr1, 0, cdp, 0); // +delta
connect(audio_rr1, 0, cdm, 0); // -delta
connect(audio_rr0, 0, add0, 0);
connect(cdp, 0, add0, 1);
connect(add0, 0, self(), 0); // left = sum + delta
connect(audio_rr0, 0, add1, 0);
connect(cdm, 0, add1, 1);
connect(add1, 0, self(), 1); // right = sum + delta
}
else // if (!d_stereo)
{
/* connect block */
connect(self(), 0, lpf0, 0);
connect(lpf0, 0, audio_rr0, 0);
connect(audio_rr0, 0, self(), 0);
connect(audio_rr0, 0, self(), 1);
}
}