sdrangel/plugins/channelrx/demodapt/aptdemodsink.h

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4.3 KiB
C++

///////////////////////////////////////////////////////////////////////////////////
// Copyright (C) 2019 Edouard Griffiths, F4EXB //
// Copyright (C) 2021 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_APTDEMODSINK_H
#define INCLUDE_APTDEMODSINK_H
#include "dsp/channelsamplesink.h"
#include "dsp/phasediscri.h"
#include "dsp/nco.h"
#include "dsp/interpolator.h"
#include "dsp/firfilter.h"
#include "util/movingaverage.h"
#include "util/doublebufferfifo.h"
#include "util/messagequeue.h"
#include "aptdemodsettings.h"
#include <apt.h>
#include <vector>
#include <iostream>
#include <fstream>
// FIXME: Use lower sample rate for better SNR?
// Do we want an audio filter? Subcarrier at 2800Hz. Does libaptdec have one?
#define APTDEMOD_AUDIO_SAMPLE_RATE 48000
// Lines are 2 per second -> 4160 words per second
class APTDemod;
class APTDemodSink : public ChannelSampleSink {
public:
APTDemodSink(APTDemod *packetDemod);
~APTDemodSink();
virtual void feed(const SampleVector::const_iterator& begin, const SampleVector::const_iterator& end);
void applyChannelSettings(int channelSampleRate, int channelFrequencyOffset, bool force = false);
void applySettings(const APTDemodSettings& settings, bool force = false);
void setImageWorkerMessageQueue(MessageQueue *messageQueue) { m_imageWorkerMessageQueue = messageQueue; }
double getMagSq() const { return m_magsq; }
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;
}
int getSamples(float *samples, int count);
void resetDecoder();
private:
struct MagSqLevelsStore
{
MagSqLevelsStore() :
m_magsq(1e-12),
m_magsqPeak(1e-12)
{}
double m_magsq;
double m_magsqPeak;
};
APTDemod *m_aptDemod;
APTDemodSettings m_settings;
int m_channelSampleRate;
int m_channelFrequencyOffset;
NCO m_nco;
Interpolator m_interpolator;
Real m_interpolatorDistance;
Real m_interpolatorDistanceRemain;
double m_magsq;
double m_magsqSum;
double m_magsqPeak;
int m_magsqCount;
MagSqLevelsStore m_magSqLevelStore;
MessageQueue *m_imageWorkerMessageQueue;
MovingAverageUtil<Real, double, 16> m_movingAverage;
PhaseDiscriminators m_phaseDiscri;
// Audio buffer - should probably use a FIFO
float *m_samples;
int m_sampleCount;
int m_samplesLength;
int m_readIdx;
int m_writeIdx;
int m_row; // Row of image currently being received
int m_zenith; // Row number of Zenith
void processOneSample(Complex &ci);
MessageQueue *getImageWorkerMessageQueue() { return m_imageWorkerMessageQueue; }
};
#endif // INCLUDE_APTDEMODSINK_H