mirror of
https://github.com/f4exb/sdrangel.git
synced 2024-11-03 07:21:14 -05:00
129 lines
5.1 KiB
C++
129 lines
5.1 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/>. //
|
|
///////////////////////////////////////////////////////////////////////////////////
|
|
|
|
#ifndef INCLUDE_ADSBDEMODSINK_H
|
|
#define INCLUDE_ADSBDEMODSINK_H
|
|
|
|
#define BOOST_CHRONO_HEADER_ONLY
|
|
#include <boost/chrono/chrono.hpp>
|
|
|
|
#include "dsp/channelsamplesink.h"
|
|
#include "dsp/nco.h"
|
|
#include "dsp/interpolator.h"
|
|
#include "util/movingaverage.h"
|
|
|
|
#include "adsbdemodsettings.h"
|
|
#include "adsbdemodstats.h"
|
|
#include "adsbdemodsinkworker.h"
|
|
|
|
class ADSBDemodSink : public ChannelSampleSink {
|
|
public:
|
|
ADSBDemodSink();
|
|
~ADSBDemodSink();
|
|
|
|
virtual void feed(const SampleVector::const_iterator& begin, const SampleVector::const_iterator& end);
|
|
|
|
void getMagSqLevels(double& avg, double& peak, int& nbSamples)
|
|
{
|
|
if (m_magsqCount > 0)
|
|
{
|
|
m_magsq = m_magsqSum / m_magsqCount;
|
|
m_magSqLevelStore.m_magsq = m_magsq;
|
|
m_magSqLevelStore.m_magsqPeak = m_magsqPeak;
|
|
}
|
|
|
|
avg = m_magSqLevelStore.m_magsq;
|
|
peak = m_magSqLevelStore.m_magsqPeak;
|
|
nbSamples = m_magsqCount == 0 ? 1 : m_magsqCount;
|
|
|
|
m_magsqSum = 0.0f;
|
|
m_magsqPeak = 0.0f;
|
|
m_magsqCount = 0;
|
|
}
|
|
|
|
void applyChannelSettings(int channelSampleRate, int channelFrequencyOffset, bool force = false);
|
|
void applySettings(const ADSBDemodSettings& settings, bool force = false);
|
|
void setMessageQueueToGUI(MessageQueue *messageQueue) { m_messageQueueToGUI = messageQueue; }
|
|
void setMessageQueueToWorker(MessageQueue *messageQueue) { m_messageQueueToWorker = messageQueue; }
|
|
void startWorker();
|
|
void stopWorker();
|
|
|
|
private:
|
|
friend ADSBDemodSinkWorker;
|
|
|
|
struct MagSqLevelsStore
|
|
{
|
|
MagSqLevelsStore() :
|
|
m_magsq(1e-12),
|
|
m_magsqPeak(1e-12)
|
|
{}
|
|
double m_magsq;
|
|
double m_magsqPeak;
|
|
};
|
|
|
|
int m_channelSampleRate;
|
|
int m_channelFrequencyOffset;
|
|
ADSBDemodSettings m_settings;
|
|
|
|
NCO m_nco;
|
|
Interpolator m_interpolator;
|
|
Real m_interpolatorDistance;
|
|
Real m_interpolatorDistanceRemain;
|
|
|
|
boost::chrono::steady_clock::time_point m_startPoint;
|
|
double m_feedTime; //!< Time spent in feed()
|
|
|
|
// Triple buffering for sharing sample data between two threads
|
|
// Top area of each buffer is not used by writer, as it's used by the reader
|
|
// for copying the last few samples of the previous buffer, so it can
|
|
// be processed contiguously
|
|
const int m_buffers = 3;
|
|
const int m_bufferSize = 200000;
|
|
Real *m_sampleBuffer[3]; //!< Each buffer is m_bufferSize samples
|
|
QSemaphore m_bufferWrite[3]; //!< Sempahore to control write access to the buffers
|
|
QSemaphore m_bufferRead[3]; //!< Sempahore to control read access from the buffers
|
|
ADSBDemodSinkWorker m_worker; //!< Worker thread that does the actual demodulation
|
|
int m_writeBuffer; //!< Which of the 3 buffers we're writing in to
|
|
int m_writeIdx; //!< Index to to current write buffer
|
|
|
|
// These values are derived from samplesPerBit
|
|
int m_samplesPerFrame; //!< Including preamble
|
|
int m_samplesPerChip;
|
|
|
|
double m_magsq; //!< displayed averaged value
|
|
double m_magsqSum;
|
|
double m_magsqPeak;
|
|
int m_magsqCount;
|
|
MagSqLevelsStore m_magSqLevelStore;
|
|
|
|
MessageQueue *m_messageQueueToGUI;
|
|
MessageQueue *m_messageQueueToWorker;
|
|
|
|
void init(int samplesPerBit);
|
|
Real inline complexMagSq(Complex& ci)
|
|
{
|
|
double magsqRaw = ci.real()*ci.real() + ci.imag()*ci.imag();
|
|
return (Real)(magsqRaw / (SDR_RX_SCALED*SDR_RX_SCALED));
|
|
}
|
|
void processOneSample(Real magsq);
|
|
MessageQueue *getMessageQueueToGUI() { return m_messageQueueToGUI; }
|
|
MessageQueue *getMessageQueueToWorker() { return m_messageQueueToWorker; }
|
|
};
|
|
|
|
#endif // INCLUDE_ADSBDEMODSINK_H
|