mirror of
https://github.com/f4exb/sdrangel.git
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160 lines
6.8 KiB
C++
160 lines
6.8 KiB
C++
///////////////////////////////////////////////////////////////////////////////////
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// Copyright (C) 2019 Edouard Griffiths, F4EXB //
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// Copyright (C) 2021 Jon Beniston, M7RCE //
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// //
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// This program is free software; you can redistribute it and/or modify //
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// it under the terms of the GNU General Public License as published by //
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// the Free Software Foundation as version 3 of the License, or //
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// (at your option) any later version. //
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// //
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// This program is distributed in the hope that it will be useful, //
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// but WITHOUT ANY WARRANTY; without even the implied warranty of //
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the //
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// GNU General Public License V3 for more details. //
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// //
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// You should have received a copy of the GNU General Public License //
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// along with this program. If not, see <http://www.gnu.org/licenses/>. //
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///////////////////////////////////////////////////////////////////////////////////
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#ifndef INCLUDE_PAGERDEMODSINK_H
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#define INCLUDE_PAGERDEMODSINK_H
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#include <QVector>
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#include "dsp/channelsamplesink.h"
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#include "dsp/phasediscri.h"
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#include "dsp/nco.h"
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#include "dsp/interpolator.h"
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#include "dsp/firfilter.h"
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#include "util/movingaverage.h"
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#include "util/messagequeue.h"
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#include "pagerdemodsettings.h"
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#define PAGERDEMOD_FRAMES_PER_BATCH 8
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#define PAGERDEMOD_CODEWORDS_PER_FRAME 2
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#define PAGERDEMOD_BATCH_WORDS (1+(PAGERDEMOD_FRAMES_PER_BATCH*PAGERDEMOD_CODEWORDS_PER_FRAME))
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#define PAGERDEMOD_POCSAG_SYNCCODE 0x7CD215D8
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#define PAGERDEMOD_POCSAG_SYNCCODE_INV ((quint32)~PAGERDEMOD_POCSAG_SYNCCODE)
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#define PAGERDEMOD_POCSAG_IDLECODE 0x7a89c197 /* 0x7ac9c197 in spec */
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class ChannelAPI;
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class PagerDemod;
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class ScopeVis;
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class PagerDemodSink : public ChannelSampleSink {
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public:
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PagerDemodSink(PagerDemod *pagerDemod);
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~PagerDemodSink();
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virtual void feed(const SampleVector::const_iterator& begin, const SampleVector::const_iterator& end);
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void setScopeSink(ScopeVis* scopeSink) { m_scopeSink = scopeSink; }
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void applyChannelSettings(int channelSampleRate, int channelFrequencyOffset, bool force = false);
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void applySettings(const PagerDemodSettings& settings, bool force = false);
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void setMessageQueueToChannel(MessageQueue *messageQueue) { m_messageQueueToChannel = messageQueue; }
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void setChannel(ChannelAPI *channel) { m_channel = channel; }
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double getMagSq() const { return m_magsq; }
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void getMagSqLevels(double& avg, double& peak, int& nbSamples)
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{
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if (m_magsqCount > 0)
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{
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m_magsq = m_magsqSum / m_magsqCount;
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m_magSqLevelStore.m_magsq = m_magsq;
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m_magSqLevelStore.m_magsqPeak = m_magsqPeak;
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}
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avg = m_magSqLevelStore.m_magsq;
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peak = m_magSqLevelStore.m_magsqPeak;
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nbSamples = m_magsqCount == 0 ? 1 : m_magsqCount;
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m_magsqSum = 0.0f;
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m_magsqPeak = 0.0f;
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m_magsqCount = 0;
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}
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private:
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struct MagSqLevelsStore
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{
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MagSqLevelsStore() :
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m_magsq(1e-12),
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m_magsqPeak(1e-12)
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{}
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double m_magsq;
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double m_magsqPeak;
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};
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ScopeVis* m_scopeSink; // Scope GUI to display debug waveforms
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PagerDemod *m_pagerDemod;
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PagerDemodSettings m_settings;
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ChannelAPI *m_channel;
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int m_channelSampleRate;
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int m_channelFrequencyOffset;
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int m_samplesPerSymbol; // Number of samples per symbol
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NCO m_nco;
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Interpolator m_interpolator;
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Real m_interpolatorDistance;
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Real m_interpolatorDistanceRemain;
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double m_magsq;
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double m_magsqSum;
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double m_magsqPeak;
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int m_magsqCount;
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MagSqLevelsStore m_magSqLevelStore;
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MessageQueue *m_messageQueueToChannel;
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MovingAverageUtil<Real, double, 2048> m_preambleMovingAverage;
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MovingAverageUtil<Real, double, 16> m_movingAverage;
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Lowpass<Complex> m_lowpass; // RF input filter
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PhaseDiscriminators m_phaseDiscri; // FM demodulator
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Lowpass<Real> m_lowpassBaud; // Low pass filter for FM demod output
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Real m_dcOffset; // Calculated DC offset of preamble
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int m_dataPrev; // m_data for previous sample
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bool m_inverted; // Whether low frequency is a 1 or 0
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int m_bit; // Sampled bit
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bool m_gotSOP; // Set when sync word received
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quint32 m_bits; // Received bit shift register
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int m_bitCount; // Number of bits in m_bits
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int m_syncCount; // Sample count to centre of bit
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int m_batchNumber; // Count of batches in current transmission
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quint32 m_codeWords[PAGERDEMOD_BATCH_WORDS]; // Received codewords within a batch
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bool m_codeWordsBCHError[PAGERDEMOD_BATCH_WORDS]; // Records if BCH error when decoding this codeword
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int m_wordCount; // Count of number of receive codewords
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bool m_addressValid; // Indicates we received a (non-idle) address
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quint32 m_address; // 21-bit address of current message
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int m_functionBits; // 0 = Numeric only, 3 = 7-bit ASCII (CCITT Alphabet No. 5)
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int m_parityErrors; // Count of parity errors in current message
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int m_bchErrors; // Count of BCH errors in current message
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QString m_numericMessage; // Message decoded in numeric character set
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QString m_alphaMessage; // Message decoded in to alphanumeric character set
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quint32 m_alphaBitBuffer; // Bit buffer to 7-bit chars spread across codewords
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int m_alphaBitBufferBits; // Count of bits in m_alphaBitBuffer
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QVector<qint16> m_demodBuffer;
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int m_demodBufferFill;
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ComplexVector m_sampleBuffer;
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static const int m_sampleBufferSize = PagerDemodSettings::m_channelSampleRate / 20; // 50ms
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int m_sampleBufferIndex;
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void processOneSample(Complex &ci);
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MessageQueue *getMessageQueueToChannel() { return m_messageQueueToChannel; }
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void sampleToScope(Complex sample);
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void decodeBatch();
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int xorBits(quint32 word, int firstBit, int lastBit);
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bool evenParity(quint32 word, int firstBit, int lastBit, int parityBit);
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quint32 reverse(quint32 x);
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quint32 bchEncode(const quint32 cw);
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bool bchDecode(const quint32 cw, quint32& correctedCW);
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};
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#endif // INCLUDE_PAGERDEMODSINK_H
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