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557 lines
16 KiB
C++
557 lines
16 KiB
C++
///////////////////////////////////////////////////////////////////////////////////
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// Copyright (C) 2019-2020, 2022-2023 Edouard Griffiths, F4EXB <f4exb06@gmail.com> //
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// Copyright (C) 2022 Jiří Pinkava <jiri.pinkava@rossum.ai> //
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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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#include <QDebug>
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#include "codec2/freedv_api.h"
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#include "codec2/modem_stats.h"
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#include "dsp/basebandsamplesink.h"
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#include "util/db.h"
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#include "freedvdemodsink.h"
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const unsigned int FreeDVDemodSink::m_ssbFftLen = 1024;
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const float FreeDVDemodSink::m_agcTarget = 3276.8f; // -10 dB amplitude => -20 dB power: center of normal signal
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FreeDVDemodSink::FreeDVStats::FreeDVStats()
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{
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init();
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}
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void FreeDVDemodSink::FreeDVStats::init()
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{
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m_sync = false;
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m_snrEst = -20;
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m_clockOffset = 0;
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m_freqOffset = 0;
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m_syncMetric = 0;
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m_totalBitErrors = 0;
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m_lastTotalBitErrors = 0;
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m_ber = 0;
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m_frameCount = 0;
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m_berFrameCount = 0;
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m_fps = 1;
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}
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void FreeDVDemodSink::FreeDVStats::collect(struct freedv *freeDV)
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{
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struct MODEM_STATS stats;
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freedv_get_modem_extended_stats(freeDV, &stats);
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m_totalBitErrors = freedv_get_total_bit_errors(freeDV);
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m_clockOffset = stats.clock_offset;
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m_freqOffset = stats.foff;
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m_syncMetric = stats.sync_metric;
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m_sync = stats.sync != 0;
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m_snrEst = stats.snr_est;
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if (m_berFrameCount >= m_fps)
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{
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m_ber = m_totalBitErrors - m_lastTotalBitErrors;
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m_ber = m_ber < 0 ? 0 : m_ber;
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m_berFrameCount = 0;
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m_lastTotalBitErrors = m_totalBitErrors;
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// qDebug("FreeDVStats::collect: demod sync: %s sync metric: %f demod snr: %3.2f dB BER: %d clock offset: %f freq offset: %f",
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// m_sync ? "ok" : "ko", m_syncMetric, m_snrEst, m_ber, m_clockOffset, m_freqOffset);
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}
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m_berFrameCount++;
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m_frameCount++;
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}
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FreeDVDemodSink::FreeDVSNR::FreeDVSNR()
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{
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m_sum = 0.0f;
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m_peak = 0.0f;
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m_n = 0;
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m_reset = true;
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}
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void FreeDVDemodSink::FreeDVSNR::accumulate(float snrdB)
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{
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if (m_reset)
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{
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m_sum = CalcDb::powerFromdB(snrdB);
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m_peak = snrdB;
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m_n = 1;
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m_reset = false;
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}
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else
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{
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m_sum += CalcDb::powerFromdB(snrdB);
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m_peak = std::max(m_peak, snrdB);
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m_n++;
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}
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}
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FreeDVDemodSink::LevelRMS::LevelRMS()
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{
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m_sum = 0.0f;
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m_peak = 0.0f;
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m_n = 0;
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m_reset = true;
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}
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void FreeDVDemodSink::LevelRMS::accumulate(float level)
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{
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if (m_reset)
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{
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m_sum = level * level;
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m_peak = std::fabs(level);
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m_n = 1;
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m_reset = false;
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}
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else
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{
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m_sum += level * level;
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m_peak = std::max(m_peak, std::fabs(level));
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m_n++;
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}
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}
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FreeDVDemodSink::FreeDVDemodSink() :
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m_hiCutoff(6000),
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m_lowCutoff(0),
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m_volume(2),
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m_spanLog2(3),
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m_sum(fftfilt::cmplx{0,0}),
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m_channelSampleRate(48000),
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m_modemSampleRate(48000),
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m_speechSampleRate(8000), // fixed 8 kS/s
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m_audioSampleRate(48000),
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m_channelFrequencyOffset(0),
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m_audioMute(false),
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m_simpleAGC(0.003f, 0.0f, 1e-6f),
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m_agcActive(false),
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m_squelchDelayLine(2*48000),
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m_audioActive(false),
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m_spectrumSink(nullptr),
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m_audioFifo(24000),
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m_freeDV(nullptr),
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m_nSpeechSamples(0),
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m_nMaxModemSamples(0),
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m_iSpeech(0),
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m_iModem(0),
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m_speechOut(nullptr),
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m_modIn(nullptr),
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m_levelInNbSamples(480) // 10ms @ 48 kS/s
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{
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m_audioBuffer.resize(1<<14);
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m_audioBufferFill = 0;
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m_undersampleCount = 0;
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m_magsq = 0.0f;
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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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m_simpleAGC.resizeNew(m_modemSampleRate/10, 0.003);
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SSBFilter = new fftfilt(m_lowCutoff / m_modemSampleRate, m_hiCutoff / m_modemSampleRate, m_ssbFftLen);
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m_SSBFilterBuffer = new fftfilt::cmplx[m_ssbFftLen];
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std::fill(m_SSBFilterBuffer, m_SSBFilterBuffer + m_ssbFftLen, fftfilt::cmplx{0.0f, 0.0f});
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m_SSBFilterBufferIndex = 0;
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applyChannelSettings(m_channelSampleRate, m_channelFrequencyOffset, true);
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applySettings(m_settings, true);
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}
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FreeDVDemodSink::~FreeDVDemodSink()
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{
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delete SSBFilter;
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delete[] m_SSBFilterBuffer;
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}
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void FreeDVDemodSink::feed(const SampleVector::const_iterator& begin, const SampleVector::const_iterator& end)
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{
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if (!m_freeDV) {
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return;
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}
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QMutexLocker mlock(&m_mutex);
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Complex ci;
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for(SampleVector::const_iterator it = begin; it < end; ++it)
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{
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Complex c(it->real(), it->imag());
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c *= m_nco.nextIQ();
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if (m_interpolatorDistance < 1.0f) // interpolate
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{
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while (!m_interpolator.interpolate(&m_interpolatorDistanceRemain, c, &ci))
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{
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processOneSample(ci);
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m_interpolatorDistanceRemain += m_interpolatorDistance;
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}
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}
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else
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{
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if (m_interpolator.decimate(&m_interpolatorDistanceRemain, c, &ci))
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{
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processOneSample(ci);
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m_interpolatorDistanceRemain += m_interpolatorDistance;
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}
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}
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}
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if (m_spectrumSink && (m_sampleBuffer.size() != 0))
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{
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m_spectrumSink->feed(m_sampleBuffer.begin(), m_sampleBuffer.end(), true);
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m_sampleBuffer.clear();
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}
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}
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void FreeDVDemodSink::processOneSample(Complex &ci)
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{
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fftfilt::cmplx *sideband;
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int n_out = 0;
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int decim = 1<<(m_spanLog2 - 1);
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unsigned char decim_mask = decim - 1; // counter LSB bit mask for decimation by 2^(m_scaleLog2 - 1)
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m_sum += m_SSBFilterBuffer[m_SSBFilterBufferIndex];
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if (!(m_undersampleCount++ & decim_mask))
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{
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Real avgr = m_sum.real() / decim;
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Real avgi = m_sum.imag() / decim;
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m_magsq = (avgr*avgr + avgi*avgi) / (SDR_RX_SCALED*SDR_RX_SCALED);
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m_magsqSum += m_magsq;
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if (m_magsq > m_magsqPeak)
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{
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m_magsqPeak = m_magsq;
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}
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m_magsqCount++;
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m_sampleBuffer.push_back(Sample(avgr, avgi));
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m_sum.real(0.0);
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m_sum.imag(0.0);
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}
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fftfilt::cmplx z = m_SSBFilterBuffer[m_SSBFilterBufferIndex];
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Real demod = (z.real() + z.imag()) * 0.7;
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// Real demod = m_SSBFilterBuffer[m_SSBFilterBufferIndex].real(); // works as good
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if (m_agcActive)
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{
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m_simpleAGC.feed(demod);
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demod *= (m_settings.m_volumeIn * 3276.8f) / m_simpleAGC.getValue(); // provision for peak to average ratio (here 10) compensated by m_volumeIn
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}
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else
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{
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demod *= m_settings.m_volumeIn;
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}
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pushSampleToDV((qint16) demod);
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n_out = SSBFilter->runSSB(ci, &sideband, true); // always USB side
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if (n_out > 0)
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{
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std::copy(sideband, sideband + n_out, m_SSBFilterBuffer);
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m_SSBFilterBufferIndex = 0;
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}
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else if (m_SSBFilterBufferIndex < m_ssbFftLen - 1)
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{
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m_SSBFilterBufferIndex++;
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}
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}
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void FreeDVDemodSink::pushSampleToDV(int16_t sample)
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{
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qint16 audioSample;
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calculateLevel(sample);
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if (m_iModem == m_nin)
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{
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int nout = freedv_rx(m_freeDV, m_speechOut, m_modIn);
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m_freeDVStats.collect(m_freeDV);
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m_freeDVSNR.accumulate(m_freeDVStats.m_snrEst);
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if (m_settings.m_audioMute)
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{
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for (uint32_t i = 0; i < nout * m_audioResampler.getDecimation(); i++) {
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pushSampleToAudio(0);
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}
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}
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else
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{
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for (int i = 0; i < nout; i++)
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{
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while (!m_audioResampler.upSample(m_speechOut[i], audioSample)) {
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pushSampleToAudio(audioSample);
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}
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pushSampleToAudio(audioSample);
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}
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}
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m_iModem = 0;
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m_iSpeech = 0;
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}
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m_modIn[m_iModem++] = sample;
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}
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void FreeDVDemodSink::calculateLevel(int16_t& sample)
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{
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if (m_levelIn.m_n >= m_levelInNbSamples)
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{
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m_rmsLevel = sqrt(m_levelIn.m_sum / m_levelInNbSamples);
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m_peakLevel = m_levelIn.m_peak;
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m_levelIn.m_reset = true;
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}
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m_levelIn.accumulate(sample/29491.2f); // scale on 90% (0.9 * 32768.0)
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}
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void FreeDVDemodSink::pushSampleToAudio(int16_t sample)
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{
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m_audioBuffer[m_audioBufferFill].l = sample * m_volume;
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m_audioBuffer[m_audioBufferFill].r = sample * m_volume;
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++m_audioBufferFill;
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if (m_audioBufferFill >= m_audioBuffer.size())
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{
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std::size_t res = m_audioFifo.write((const quint8*)&m_audioBuffer[0], std::min(m_audioBufferFill, m_audioBuffer.size()));
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if (res != m_audioBufferFill) {
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qDebug("FreeDVDemodSink::pushSampleToAudio: %lu/%lu samples written", res, m_audioBufferFill);
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}
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m_audioBufferFill = 0;
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}
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}
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void FreeDVDemodSink::applyChannelSettings(int channelSampleRate, int channnelFrequencyOffset, bool force)
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{
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qDebug() << "FreeDVDemodSink::applyChannelSettings:"
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<< " channelSampleRate: " << channelSampleRate
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<< " inputFrequencyOffset: " << channnelFrequencyOffset;
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if ((m_channelFrequencyOffset != channnelFrequencyOffset) ||
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(m_channelSampleRate != channelSampleRate) || force)
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{
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m_nco.setFreq(-channnelFrequencyOffset, channelSampleRate);
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}
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if ((m_channelSampleRate != channelSampleRate) || force)
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{
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m_interpolator.create(16, channelSampleRate, m_hiCutoff * 1.5f, 2.0f);
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m_interpolatorDistanceRemain = 0;
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m_interpolatorDistance = (Real) channelSampleRate / (Real) m_modemSampleRate;
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}
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m_channelSampleRate = channelSampleRate;
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m_channelFrequencyOffset = channnelFrequencyOffset;
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}
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void FreeDVDemodSink::applyAudioSampleRate(int sampleRate)
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{
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if (sampleRate < 0)
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{
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qWarning("FreeDVDemodSink::applyAudioSampleRate: invalid sample rate: %d", sampleRate);
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return;
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}
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qDebug("FreeDVDemodSink::applyAudioSampleRate: %d", sampleRate);
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m_audioFifo.setSize(sampleRate);
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m_audioResampler.setDecimation(sampleRate / m_speechSampleRate);
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m_audioResampler.setAudioFilters(sampleRate, sampleRate, 250, 3300, 4.0f);
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m_audioSampleRate = sampleRate;
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}
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void FreeDVDemodSink::applyFreeDVMode(FreeDVDemodSettings::FreeDVMode mode)
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{
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m_hiCutoff = FreeDVDemodSettings::getHiCutoff(mode);
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m_lowCutoff = FreeDVDemodSettings::getLowCutoff(mode);
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uint32_t modemSampleRate = FreeDVDemodSettings::getModSampleRate(mode);
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QMutexLocker mlock(&m_mutex);
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SSBFilter->create_filter(m_lowCutoff / (float) modemSampleRate, m_hiCutoff / (float) modemSampleRate);
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// baseband interpolator
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if (modemSampleRate != m_modemSampleRate)
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{
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m_interpolatorDistanceRemain = 0;
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//m_interpolatorConsumed = false;
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m_interpolatorDistance = (Real) m_channelSampleRate / (Real) modemSampleRate;
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m_interpolator.create(16, m_channelSampleRate, m_hiCutoff * 1.5f, 2.0f);
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m_modemSampleRate = modemSampleRate;
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m_simpleAGC.resizeNew(modemSampleRate/10, 0.003);
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m_levelInNbSamples = m_modemSampleRate / 100; // 10ms
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}
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// FreeDV object
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if (m_freeDV) {
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freedv_close(m_freeDV);
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}
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int fdv_mode = -1;
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switch(mode)
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{
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case FreeDVDemodSettings::FreeDVMode700C:
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fdv_mode = FREEDV_MODE_700C;
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break;
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case FreeDVDemodSettings::FreeDVMode700D:
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fdv_mode = FREEDV_MODE_700D;
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break;
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case FreeDVDemodSettings::FreeDVMode800XA:
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fdv_mode = FREEDV_MODE_800XA;
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break;
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case FreeDVDemodSettings::FreeDVMode1600:
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fdv_mode = FREEDV_MODE_1600;
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break;
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case FreeDVDemodSettings::FreeDVMode2400A:
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default:
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fdv_mode = FREEDV_MODE_2400A;
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break;
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}
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if (fdv_mode == FREEDV_MODE_700D)
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{
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struct freedv_advanced adv;
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adv.interleave_frames = 1;
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m_freeDV = freedv_open_advanced(fdv_mode, &adv);
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}
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else
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{
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m_freeDV = freedv_open(fdv_mode);
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}
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if (m_freeDV)
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{
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freedv_set_test_frames(m_freeDV, 0);
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freedv_set_snr_squelch_thresh(m_freeDV, -100.0);
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freedv_set_squelch_en(m_freeDV, 0);
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freedv_set_clip(m_freeDV, 0);
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freedv_set_ext_vco(m_freeDV, 0);
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freedv_set_sync(m_freeDV, FREEDV_SYNC_MANUAL);
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int nSpeechSamples = freedv_get_n_speech_samples(m_freeDV);
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int nMaxModemSamples = freedv_get_n_max_modem_samples(m_freeDV);
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int Fs = freedv_get_modem_sample_rate(m_freeDV);
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int Rs = freedv_get_modem_symbol_rate(m_freeDV);
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m_freeDVStats.init();
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if (nSpeechSamples > m_nSpeechSamples)
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{
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if (m_speechOut) {
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delete[] m_speechOut;
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}
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m_speechOut = new int16_t[nSpeechSamples];
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m_nSpeechSamples = nSpeechSamples;
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}
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if (nMaxModemSamples > m_nMaxModemSamples)
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{
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if (m_modIn) {
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delete[] m_modIn;
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}
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m_modIn = new int16_t[nMaxModemSamples];
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m_nMaxModemSamples = nMaxModemSamples;
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}
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m_iSpeech = 0;
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m_iModem = 0;
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m_nin = freedv_nin(m_freeDV);
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if (m_nin > 0) {
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m_freeDVStats.m_fps = m_modemSampleRate / m_nin;
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}
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qDebug() << "FreeDVDemodSink::applyFreeDVMode:"
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<< " fdv_mode: " << fdv_mode
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<< " m_modemSampleRate: " << m_modemSampleRate
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<< " m_lowCutoff: " << m_lowCutoff
|
|
<< " m_hiCutoff: " << m_hiCutoff
|
|
<< " Fs: " << Fs
|
|
<< " Rs: " << Rs
|
|
<< " m_nSpeechSamples: " << m_nSpeechSamples
|
|
<< " m_nMaxModemSamples: " << m_nMaxModemSamples
|
|
<< " m_nin: " << m_nin
|
|
<< " FPS: " << m_freeDVStats.m_fps;
|
|
}
|
|
else
|
|
{
|
|
qCritical("FreeDVDemodSink::applyFreeDVMode: m_freeDV was not allocated");
|
|
}
|
|
}
|
|
|
|
void FreeDVDemodSink::applySettings(const FreeDVDemodSettings& settings, bool force)
|
|
{
|
|
qDebug() << "FreeDVDemodSink::applySettings:"
|
|
<< " m_inputFrequencyOffset: " << settings.m_inputFrequencyOffset
|
|
<< " m_freeDVMode: " << (int) settings.m_freeDVMode
|
|
<< " m_volume: " << settings.m_volume
|
|
<< " m_volumeIn: " << settings.m_volumeIn
|
|
<< " m_spanLog2: " << settings.m_spanLog2
|
|
<< " m_audioMute: " << settings.m_audioMute
|
|
<< " m_agcActive: " << settings.m_agc
|
|
<< " m_audioDeviceName: " << settings.m_audioDeviceName
|
|
<< " m_streamIndex: " << settings.m_streamIndex
|
|
<< " m_useReverseAPI: " << settings.m_useReverseAPI
|
|
<< " m_reverseAPIAddress: " << settings.m_reverseAPIAddress
|
|
<< " m_reverseAPIPort: " << settings.m_reverseAPIPort
|
|
<< " m_reverseAPIDeviceIndex: " << settings.m_reverseAPIDeviceIndex
|
|
<< " m_reverseAPIChannelIndex: " << settings.m_reverseAPIChannelIndex
|
|
<< " force: " << force;
|
|
|
|
if ((m_settings.m_volume != settings.m_volume) || force)
|
|
{
|
|
m_volume = settings.m_volume;
|
|
m_volume /= 4.0; // for 3276.8
|
|
}
|
|
|
|
m_spanLog2 = settings.m_spanLog2;
|
|
m_audioMute = settings.m_audioMute;
|
|
m_agcActive = settings.m_agc;
|
|
m_settings = settings;
|
|
}
|
|
|
|
void FreeDVDemodSink::getSNRLevels(double& avg, double& peak, int& nbSamples)
|
|
{
|
|
if (m_freeDVSNR.m_n > 0)
|
|
{
|
|
avg = CalcDb::dbPower(m_freeDVSNR.m_sum / m_freeDVSNR.m_n);
|
|
peak = m_freeDVSNR.m_peak;
|
|
nbSamples = m_freeDVSNR.m_n;
|
|
m_freeDVSNR.m_reset = true;
|
|
}
|
|
else
|
|
{
|
|
avg = 0.0;
|
|
peak = 0.0;
|
|
nbSamples = 1;
|
|
}
|
|
}
|
|
|
|
void FreeDVDemodSink::resyncFreeDV()
|
|
{
|
|
QMutexLocker mlock(&m_mutex);
|
|
freedv_set_sync(m_freeDV, FREEDV_SYNC_UNSYNC);
|
|
}
|