mirror of
https://github.com/f4exb/sdrangel.git
synced 2025-10-30 20:40:20 -04:00
293 lines
10 KiB
C++
293 lines
10 KiB
C++
///////////////////////////////////////////////////////////////////////////////////
|
|
// Copyright (C) 2019 Edouard Griffiths, F4EXB //
|
|
// Copyright (C) 2020 Jon Beniston, M7RCE //
|
|
// //
|
|
// 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 as 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 V3 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 <QTime>
|
|
#include <QDebug>
|
|
|
|
#include "util/stepfunctions.h"
|
|
#include "util/db.h"
|
|
#include "dsp/dspengine.h"
|
|
#include "dsp/dspcommands.h"
|
|
#include "dsp/devicesamplemimo.h"
|
|
#include "device/deviceapi.h"
|
|
|
|
#include "adsbdemodreport.h"
|
|
#include "adsbdemodsink.h"
|
|
#include "adsbdemodsinkworker.h"
|
|
#include "adsb.h"
|
|
|
|
ADSBDemodSink::ADSBDemodSink() :
|
|
m_channelSampleRate(6000000),
|
|
m_channelFrequencyOffset(0),
|
|
m_feedTime(0.0),
|
|
m_sampleBuffer{nullptr, nullptr, nullptr},
|
|
m_worker(this),
|
|
m_writeBuffer(0),
|
|
m_writeIdx(0),
|
|
m_magsq(0.0f),
|
|
m_magsqSum(0.0f),
|
|
m_magsqPeak(0.0f),
|
|
m_magsqCount(0),
|
|
m_messageQueueToGUI(nullptr)
|
|
{
|
|
applySettings(m_settings, true);
|
|
applyChannelSettings(m_channelSampleRate, m_channelFrequencyOffset, true);
|
|
for (int i = 0; i < m_buffers; i++)
|
|
m_bufferWrite[i].release(1);
|
|
m_bufferWrite[m_writeBuffer].acquire();
|
|
}
|
|
|
|
ADSBDemodSink::~ADSBDemodSink()
|
|
{
|
|
for (int i = 0; i < m_buffers; i++)
|
|
delete[] m_sampleBuffer[i];
|
|
}
|
|
|
|
void ADSBDemodSink::feed(const SampleVector::const_iterator& begin, const SampleVector::const_iterator& end)
|
|
{
|
|
// Start timing how long we are in this function
|
|
m_startPoint = boost::chrono::steady_clock::now();
|
|
|
|
// Optimise for common case, where no resampling or frequency offset
|
|
if ((m_interpolatorDistance == 1.0f) && (m_channelFrequencyOffset == 0))
|
|
{
|
|
for (SampleVector::const_iterator it = begin; it != end; ++it)
|
|
{
|
|
/*
|
|
// SampleVector is vector of qint32 or qint16
|
|
// Use integer mul to save one FP conversion and it has lower latency
|
|
qint64 r = (qint64)it->real();
|
|
qint64 i = (qint64)it->imag();
|
|
qint64 magsqRaw = r*r + i*i;
|
|
Real magsq = (Real)((double)magsqRaw / (SDR_RX_SCALED*SDR_RX_SCALED));
|
|
processOneSample(magsq);
|
|
*/
|
|
Complex c(it->real(), it->imag());
|
|
Real magsq = complexMagSq(c);
|
|
processOneSample(magsq);
|
|
}
|
|
}
|
|
else if (m_interpolatorDistance == 1.0f) // just apply offset
|
|
{
|
|
for (SampleVector::const_iterator it = begin; it != end; ++it)
|
|
{
|
|
Complex c(it->real(), it->imag());
|
|
Complex ci;
|
|
c *= m_nco.nextIQ();
|
|
processOneSample(complexMagSq(c));
|
|
}
|
|
}
|
|
else if (m_interpolatorDistance < 1.0f) // interpolate
|
|
{
|
|
for (SampleVector::const_iterator it = begin; it != end; ++it)
|
|
{
|
|
Complex c(it->real(), it->imag());
|
|
Complex ci;
|
|
c *= m_nco.nextIQ();
|
|
while (!m_interpolator.interpolate(&m_interpolatorDistanceRemain, c, &ci))
|
|
{
|
|
processOneSample(complexMagSq(ci));
|
|
m_interpolatorDistanceRemain += m_interpolatorDistance;
|
|
}
|
|
}
|
|
}
|
|
else // decimate
|
|
{
|
|
for (SampleVector::const_iterator it = begin; it != end; ++it)
|
|
{
|
|
Complex c(it->real(), it->imag());
|
|
Complex ci;
|
|
c *= m_nco.nextIQ();
|
|
if (m_interpolator.decimate(&m_interpolatorDistanceRemain, c, &ci))
|
|
{
|
|
processOneSample(complexMagSq(ci));
|
|
m_interpolatorDistanceRemain += m_interpolatorDistance;
|
|
}
|
|
}
|
|
}
|
|
|
|
// Calculate number of seconds in this function
|
|
boost::chrono::duration<double> sec = boost::chrono::steady_clock::now() - m_startPoint;
|
|
m_feedTime += sec.count();
|
|
}
|
|
|
|
void ADSBDemodSink::processOneSample(Real magsq)
|
|
{
|
|
m_magsqSum += magsq;
|
|
if (magsq > m_magsqPeak)
|
|
m_magsqPeak = magsq;
|
|
m_magsqCount++;
|
|
m_sampleBuffer[m_writeBuffer][m_writeIdx] = magsq;
|
|
m_writeIdx++;
|
|
if (!m_bufferDateTimeValid[m_writeBuffer])
|
|
{
|
|
m_bufferFirstSampleDateTime[m_writeBuffer] = QDateTime::currentDateTime();
|
|
m_bufferDateTimeValid[m_writeBuffer] = true;
|
|
}
|
|
if (m_writeIdx >= m_bufferSize)
|
|
{
|
|
m_bufferRead[m_writeBuffer].release();
|
|
|
|
m_writeBuffer++;
|
|
if (m_writeBuffer >= m_buffers)
|
|
m_writeBuffer = 0;
|
|
|
|
// Don't include time spent waiting for a buffer
|
|
boost::chrono::duration<double> sec = boost::chrono::steady_clock::now() - m_startPoint;
|
|
m_feedTime += sec.count();
|
|
|
|
if (m_worker.isRunning())
|
|
m_bufferWrite[m_writeBuffer].acquire();
|
|
|
|
m_startPoint = boost::chrono::steady_clock::now();
|
|
|
|
m_writeIdx = m_samplesPerFrame - 1; // Leave space for copying samples from previous buffer
|
|
|
|
m_bufferDateTimeValid[m_writeBuffer] = false;
|
|
}
|
|
}
|
|
|
|
void ADSBDemodSink::startWorker()
|
|
{
|
|
qDebug() << "ADSBDemodSink::startWorker";
|
|
if (!m_worker.isRunning())
|
|
m_worker.start();
|
|
}
|
|
|
|
void ADSBDemodSink::stopWorker()
|
|
{
|
|
if (m_worker.isRunning())
|
|
{
|
|
qDebug() << "ADSBDemodSink::stopWorker: Stopping worker";
|
|
m_worker.requestInterruption();
|
|
// Worker may be blocked waiting for a buffer
|
|
for (int i = 0; i < m_buffers; i++)
|
|
{
|
|
if (m_bufferRead[i].available() == 0)
|
|
m_bufferRead[i].release(1);
|
|
}
|
|
m_worker.wait();
|
|
// If this is called from ADSBDemod, we need to also
|
|
// make sure baseband sink thread isnt blocked in processOneSample
|
|
for (int i = 0; i < m_buffers; i++)
|
|
{
|
|
if (m_bufferWrite[i].available() == 0)
|
|
m_bufferWrite[i].release(1);
|
|
}
|
|
qDebug() << "ADSBDemodSink::stopWorker: Worker stopped";
|
|
}
|
|
}
|
|
|
|
void ADSBDemodSink::init(int samplesPerBit)
|
|
{
|
|
bool restart = m_worker.isRunning();
|
|
if (restart)
|
|
{
|
|
// Stop worker as we're going to delete the buffers
|
|
stopWorker();
|
|
}
|
|
// Reset state of semaphores
|
|
for (int i = 0; i < m_buffers; i++)
|
|
{
|
|
m_bufferWrite[i].acquire(m_bufferWrite[i].available());
|
|
m_bufferWrite[i].release(1);
|
|
m_bufferRead[i].acquire(m_bufferRead[i].available());
|
|
}
|
|
m_writeBuffer = 0;
|
|
m_bufferWrite[m_writeBuffer].acquire();
|
|
|
|
for (int i = 0; i < m_buffers; i++)
|
|
{
|
|
if (m_sampleBuffer[i])
|
|
delete[] m_sampleBuffer[i];
|
|
}
|
|
|
|
m_samplesPerFrame = samplesPerBit*(ADS_B_PREAMBLE_BITS+ADS_B_ES_BITS);
|
|
m_samplesPerChip = samplesPerBit/ADS_B_CHIPS_PER_BIT;
|
|
m_writeIdx = m_samplesPerFrame - 1; // Leave space for copying samples from previous buffer
|
|
m_bufferDateTimeValid[m_writeBuffer] = false;
|
|
|
|
for (int i = 0; i < m_buffers; i++)
|
|
m_sampleBuffer[i] = new Real[m_bufferSize];
|
|
|
|
if (restart)
|
|
startWorker();
|
|
}
|
|
|
|
void ADSBDemodSink::applyChannelSettings(int channelSampleRate, int channelFrequencyOffset, bool force)
|
|
{
|
|
qDebug() << "ADSBDemodSink::applyChannelSettings:"
|
|
<< " channelSampleRate: " << channelSampleRate
|
|
<< " channelFrequencyOffset: " << channelFrequencyOffset;
|
|
|
|
if (channelSampleRate == 0) {
|
|
return;
|
|
}
|
|
|
|
if ((channelFrequencyOffset != m_channelFrequencyOffset) ||
|
|
(channelSampleRate != m_channelSampleRate) || force)
|
|
{
|
|
m_nco.setFreq(-channelFrequencyOffset, channelSampleRate);
|
|
}
|
|
|
|
if ((channelSampleRate != m_channelSampleRate) || force)
|
|
{
|
|
m_interpolator.create(m_settings.m_interpolatorPhaseSteps, channelSampleRate, m_settings.m_rfBandwidth / 2.2, m_settings.m_interpolatorTapsPerPhase);
|
|
m_interpolatorDistanceRemain = 0;
|
|
m_interpolatorDistance = (Real) channelSampleRate / (Real) (ADS_B_BITS_PER_SECOND * m_settings.m_samplesPerBit);
|
|
}
|
|
|
|
m_channelSampleRate = channelSampleRate;
|
|
m_channelFrequencyOffset = channelFrequencyOffset;
|
|
}
|
|
|
|
void ADSBDemodSink::applySettings(const ADSBDemodSettings& settings, bool force)
|
|
{
|
|
qDebug() << "ADSBDemodSink::applySettings:"
|
|
<< " m_inputFrequencyOffset: " << settings.m_inputFrequencyOffset
|
|
<< " m_rfBandwidth: " << settings.m_rfBandwidth
|
|
<< " m_correlationThreshold: " << settings.m_correlationThreshold
|
|
<< " m_correlateFullPreamble: " << settings.m_correlateFullPreamble
|
|
<< " m_demodModeS: " << settings.m_demodModeS
|
|
<< " m_samplesPerBit: " << settings.m_samplesPerBit
|
|
<< " force: " << force;
|
|
|
|
if ((settings.m_rfBandwidth != m_settings.m_rfBandwidth)
|
|
|| (settings.m_samplesPerBit != m_settings.m_samplesPerBit)
|
|
|| (settings.m_interpolatorPhaseSteps != m_settings.m_interpolatorPhaseSteps)
|
|
|| (settings.m_interpolatorTapsPerPhase != m_settings.m_interpolatorTapsPerPhase)
|
|
|| force)
|
|
{
|
|
m_interpolator.create(m_settings.m_interpolatorPhaseSteps, m_channelSampleRate, settings.m_rfBandwidth / 2.2, m_settings.m_interpolatorTapsPerPhase);
|
|
m_interpolatorDistanceRemain = 0;
|
|
m_interpolatorDistance = (Real) m_channelSampleRate / (Real) (ADS_B_BITS_PER_SECOND * settings.m_samplesPerBit);
|
|
}
|
|
|
|
if ((settings.m_samplesPerBit != m_settings.m_samplesPerBit) || force)
|
|
{
|
|
init(settings.m_samplesPerBit);
|
|
}
|
|
|
|
// Forward to worker
|
|
ADSBDemodSinkWorker::MsgConfigureADSBDemodSinkWorker *msg = ADSBDemodSinkWorker::MsgConfigureADSBDemodSinkWorker::create(
|
|
settings, force);
|
|
m_worker.getInputMessageQueue()->push(msg);
|
|
|
|
m_settings = settings;
|
|
}
|