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waveform: Setup freq_xlating_fir_filter based on selection

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This commit is contained in:
Mike Walters
2016-01-11 03:52:43 +00:00
parent 5728d46bba
commit dbd45d0519
3 changed files with 49 additions and 7 deletions
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46
waveformview.cpp
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@@ -23,6 +23,8 @@
#include <gnuradio/top_block.h>
#include <gnuradio/analog/quadrature_demod_cf.h>
#include <gnuradio/blocks/multiply_const_cc.h>
#include <gnuradio/filter/firdes.h>
#include <gnuradio/filter/freq_xlating_fir_filter_ccf.h>
#include "grsamplebuffer.h"
#include "memory_sink.h"
#include "memory_source.h"
@@ -37,7 +39,7 @@ WaveformView::WaveformView()
}
}
void WaveformView::inputSourceChanged(AbstractSampleSource *src)
void WaveformView::refreshSources()
{
sampleSources.clear();
@@ -45,8 +47,19 @@ void WaveformView::inputSourceChanged(AbstractSampleSource *src)
auto iq_mem_source = gr::blocks::memory_source::make(8);
auto iq_mem_sink = gr::blocks::memory_sink::make(8);
auto multiply = gr::blocks::multiply_const_cc::make(20);
iq_tb->connect(iq_mem_source, 0, multiply, 0);
iq_tb->connect(multiply, 0, iq_mem_sink, 0);
if (selection) {
float centre = (selectionFreq.first + selectionFreq.second) / 2;
float cutoff = std::abs(selectionFreq.first - centre);
auto lp_taps = gr::filter::firdes::low_pass(1.0, 1.0, cutoff, cutoff / 2);
auto filter = gr::filter::freq_xlating_fir_filter_ccf::make(1, lp_taps, centre, 1.0);
iq_tb->connect(iq_mem_source, 0, filter, 0);
iq_tb->connect(filter, 0, multiply, 0);
iq_tb->connect(multiply, 0, iq_mem_sink, 0);
} else {
iq_tb->connect(iq_mem_source, 0, multiply, 0);
iq_tb->connect(multiply, 0, iq_mem_sink, 0);
}
gr::top_block_sptr quad_demod_tb = gr::make_top_block("quad_demod");
auto quad_demod_mem_source = gr::blocks::memory_source::make(8);
@@ -55,23 +68,42 @@ void WaveformView::inputSourceChanged(AbstractSampleSource *src)
quad_demod_tb->connect(quad_demod_mem_source, 0, quad_demod, 0);
quad_demod_tb->connect(quad_demod, 0, quad_demod_mem_sink, 0);
sampleSources.emplace_back(new GRSampleBuffer<std::complex<float>, std::complex<float>>(mainSampleSource, iq_tb, iq_mem_source, iq_mem_sink));
sampleSources.emplace_back(new GRSampleBuffer<std::complex<float>, float>(dynamic_cast<SampleSource<std::complex<float>>*>(sampleSources[0].get()), quad_demod_tb, quad_demod_mem_source, quad_demod_mem_sink));
update();
}
void WaveformView::inputSourceChanged(AbstractSampleSource *src)
{
auto derived = dynamic_cast<SampleSource<std::complex<float>>*>(src);
if (derived == nullptr)
throw new std::runtime_error("SampleSource doesn't provide correct type for GRSampleBuffer");
sampleSources.emplace_back(new GRSampleBuffer<std::complex<float>, std::complex<float>>(derived, iq_tb, iq_mem_source, iq_mem_sink));
sampleSources.emplace_back(new GRSampleBuffer<std::complex<float>, float>(derived, quad_demod_tb, quad_demod_mem_source, quad_demod_mem_sink));
update();
mainSampleSource = derived;
refreshSources();
}
void WaveformView::viewChanged(off_t firstSample, off_t lastSample)
{
this->firstSample = firstSample;
this->lastSample = lastSample;
qDebug() << "viewChanged(" << firstSample << ", " << lastSample << ")";
update();
}
void WaveformView::selectionChanged(std::pair<off_t, off_t> selectionTime, std::pair<float, float> selectionFreq)
{
this->selectionTime = selectionTime;
this->selectionFreq = selectionFreq;
selection = true;
refreshSources();
}
void WaveformView::selectionCleared()
{
selection = false;
refreshSources();
}
void WaveformView::paintEvent(QPaintEvent *event)
{
if (lastSample - firstSample <= 0) return;