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548 lines
20 KiB
C++
548 lines
20 KiB
C++
///////////////////////////////////////////////////////////////////////////////////
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// Copyright (C) 2019 Edouard Griffiths, F4EXB //
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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 <QTime>
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#include <QDebug>
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#include <stdio.h>
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#include <complex.h>
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#include "atvdemodsink.h"
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const int ATVDemodSink::m_ssbFftLen = 1024;
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ATVDemodSink::ATVDemodSink() :
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m_channelSampleRate(1000000),
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m_channelFrequencyOffset(0),
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m_samplesPerLine(100),
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m_samplesPerLineFrac(0.0f),
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m_videoTabIndex(0),
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m_scopeSink(nullptr),
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m_registeredTVScreen(nullptr),
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m_numberSamplesPerHTop(0),
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m_fieldIndex(0),
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m_synchroSamples(0),
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m_effMin(20.0f),
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m_effMax(-20.0f),
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m_ampMin(-1.0f),
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m_ampMax(1.0f),
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m_ampDelta(2.0f),
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m_amSampleIndex(0),
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m_sampleOffset(0),
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m_sampleOffsetFrac(0.0f),
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m_sampleOffsetDetected(0),
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m_lineIndex(0),
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m_hSyncShift(0.0f),
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m_hSyncErrorCount(0),
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m_ampAverage(4800),
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m_bfoPLL(200/1000000, 100/1000000, 0.01),
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m_bfoFilter(200.0, 1000000.0, 0.9),
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m_DSBFilter(nullptr),
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m_DSBFilterBuffer(nullptr),
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m_DSBFilterBufferIndex(0)
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{
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qDebug("ATVDemodSink::ATVDemodSink");
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//*************** ATV PARAMETERS ***************
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m_synchroSamples=0;
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m_interleaved = true;
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m_DSBFilter = new fftfilt(m_settings.m_fftBandwidth / (float) m_channelSampleRate, 2*m_ssbFftLen); // arbitrary cutoff
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m_DSBFilterBuffer = new Complex[m_ssbFftLen];
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std::fill(m_DSBFilterBuffer, m_DSBFilterBuffer + m_ssbFftLen, Complex{0.0, 0.0});
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std::fill(m_fltBufferI, m_fltBufferI+6, 0.0f);
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std::fill(m_fltBufferQ, m_fltBufferQ+6, 0.0f);
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m_objPhaseDiscri.setFMScaling(1.0f);
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applySettings(m_settings, true);
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applyChannelSettings(m_channelSampleRate, m_channelFrequencyOffset, true);
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}
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ATVDemodSink::~ATVDemodSink()
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{
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delete m_DSBFilter;
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delete[] m_DSBFilterBuffer;
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}
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void ATVDemodSink::feed(const SampleVector::const_iterator& begin, const SampleVector::const_iterator& end)
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{
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//********** Let's rock and roll buddy ! **********
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//********** Accessing ATV Screen context **********
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for (SampleVector::const_iterator it = begin; it != end; ++it /* ++it **/)
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{
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Complex c(it->real(), it->imag());
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if (m_settings.m_inputFrequencyOffset != 0) {
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c *= m_nco.nextIQ();
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}
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demod(c);
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}
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if ((m_videoTabIndex == 1) && (m_scopeSink)) // do only if scope tab is selected and scope is available
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{
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m_scopeSink->feed(m_scopeSampleBuffer.begin(), m_scopeSampleBuffer.end(), false); // m_ssb = positive only
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m_scopeSampleBuffer.clear();
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}
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}
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void ATVDemodSink::demod(Complex& c)
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{
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float sampleNormI;
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float sampleNormQ;
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float sampleNorm;
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float sample;
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int sampleVideo;
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//********** FFT filtering **********
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if (m_settings.m_fftFiltering)
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{
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int n_out;
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Complex *filtered;
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n_out = m_DSBFilter->runAsym(c, &filtered, m_settings.m_atvModulation != ATVDemodSettings::ATV_LSB); // all usb except explicitely lsb
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if (n_out > 0)
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{
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std::copy(filtered, filtered + n_out, m_DSBFilterBuffer);
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m_DSBFilterBufferIndex = 0;
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}
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else if (m_DSBFilterBufferIndex < m_ssbFftLen - 1) // safe
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{
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m_DSBFilterBufferIndex++;
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}
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}
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//********** demodulation **********
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const float& fltI = m_settings.m_fftFiltering ? m_DSBFilterBuffer[m_DSBFilterBufferIndex].real() : c.real();
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const float& fltQ = m_settings.m_fftFiltering ? m_DSBFilterBuffer[m_DSBFilterBufferIndex].imag() : c.imag();
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double magSq;
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if ((m_settings.m_atvModulation == ATVDemodSettings::ATV_FM1) || (m_settings.m_atvModulation == ATVDemodSettings::ATV_FM2))
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{
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//Amplitude FM
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magSq = fltI*fltI + fltQ*fltQ;
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m_magSqAverage(magSq);
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sampleNorm = sqrt(magSq);
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sampleNormI = fltI/sampleNorm;
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sampleNormQ = fltQ/sampleNorm;
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//-2 > 2 : 0 -> 1 volt
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//0->0.3 synchro 0.3->1 image
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if (m_settings.m_atvModulation == ATVDemodSettings::ATV_FM1)
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{
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//YDiff Cd
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sample = m_fltBufferI[0]*(sampleNormQ - m_fltBufferQ[1]);
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sample -= m_fltBufferQ[0]*(sampleNormI - m_fltBufferI[1]);
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sample += 2.0f;
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sample /= 4.0f;
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}
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else
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{
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//YDiff Folded
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sample = m_fltBufferI[2]*((m_fltBufferQ[5]-sampleNormQ)/16.0f + m_fltBufferQ[1] - m_fltBufferQ[3]);
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sample -= m_fltBufferQ[2]*((m_fltBufferI[5]-sampleNormI)/16.0f + m_fltBufferI[1] - m_fltBufferI[3]);
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sample += 2.125f;
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sample /= 4.25f;
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m_fltBufferI[5] = m_fltBufferI[4];
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m_fltBufferQ[5] = m_fltBufferQ[4];
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m_fltBufferI[4] = m_fltBufferI[3];
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m_fltBufferQ[4] = m_fltBufferQ[3];
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m_fltBufferI[3] = m_fltBufferI[2];
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m_fltBufferQ[3] = m_fltBufferQ[2];
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m_fltBufferI[2] = m_fltBufferI[1];
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m_fltBufferQ[2] = m_fltBufferQ[1];
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}
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m_fltBufferI[1] = m_fltBufferI[0];
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m_fltBufferQ[1] = m_fltBufferQ[0];
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m_fltBufferI[0] = sampleNormI;
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m_fltBufferQ[0] = sampleNormQ;
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if (m_settings.m_fmDeviation != 1.0f)
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{
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sample = ((sample - 0.5f) / m_settings.m_fmDeviation) + 0.5f;
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}
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}
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else if (m_settings.m_atvModulation == ATVDemodSettings::ATV_AM)
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{
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//Amplitude AM
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magSq = fltI*fltI + fltQ*fltQ;
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m_magSqAverage(magSq);
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sampleNorm = sqrt(magSq);
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float sampleRaw = sampleNorm / SDR_RX_SCALEF;
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m_ampAverage(sampleRaw);
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sample = sampleRaw / (2.0f * m_ampAverage.asFloat()); // AGC
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}
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else if ((m_settings.m_atvModulation == ATVDemodSettings::ATV_USB) || (m_settings.m_atvModulation == ATVDemodSettings::ATV_LSB))
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{
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magSq = fltI*fltI + fltQ*fltQ;
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m_magSqAverage(magSq);
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sampleNorm = sqrt(magSq);
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Real bfoValues[2];
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float fltFiltered = m_bfoFilter.run(fltI);
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m_bfoPLL.process(fltFiltered, bfoValues);
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// do the mix
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float mixI = fltI * bfoValues[0] - fltQ * bfoValues[1];
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float mixQ = fltI * bfoValues[1] + fltQ * bfoValues[0];
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if (m_settings.m_atvModulation == ATVDemodSettings::ATV_USB) {
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sample = (mixI + mixQ);
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} else {
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sample = (mixI - mixQ);
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}
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}
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else if (m_settings.m_atvModulation == ATVDemodSettings::ATV_FM3)
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{
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float rawDeviation;
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sample = m_objPhaseDiscri.phaseDiscriminatorDelta(c, magSq, rawDeviation) + 0.5f;
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m_magSqAverage(magSq);
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sampleNorm = sqrt(magSq);
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}
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else
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{
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magSq = fltI*fltI + fltQ*fltQ;
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m_magSqAverage(magSq);
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sampleNorm = sqrt(magSq);
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sample = 0.0f;
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}
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//********** AM sample normalization and coarse scale estimation **********
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if ((m_settings.m_atvModulation == ATVDemodSettings::ATV_AM)
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|| (m_settings.m_atvModulation == ATVDemodSettings::ATV_USB)
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|| (m_settings.m_atvModulation == ATVDemodSettings::ATV_LSB))
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{
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// Mini and Maxi Amplitude tracking
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if (sample < m_effMin) {
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m_effMin = sample;
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}
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if (sample > m_effMax) {
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m_effMax = sample;
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}
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if (m_amSampleIndex < m_samplesPerLine * m_settings.m_nbLines * 2) // calculate on two full images
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{
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m_amSampleIndex++;
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}
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else
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{
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// scale signal based on extrema on the estimation period
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m_ampMin = m_effMin;
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m_ampMax = m_effMax;
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m_ampDelta = (m_ampMax - m_ampMin);
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if (m_ampDelta <= 0.0) {
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m_ampDelta = 1.0f;
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}
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// readjustment
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m_ampDelta /= m_settings.m_amScalingFactor / 100.0f;
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m_ampMin += m_ampDelta * (m_settings.m_amOffsetFactor / 100.0f);
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// qDebug("ATVDemod::demod: m_ampMin: %f m_ampMax: %f m_ampDelta: %f", m_ampMin, m_ampMax, m_ampDelta);
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//Reset extrema
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m_effMin = 20.0f;
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m_effMax = -20.0f;
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m_amSampleIndex = 0;
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}
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//Normalisation of current sample
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sample -= m_ampMin;
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sample /= m_ampDelta;
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}
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sample = m_settings.m_invertVideo ? 1.0f - sample : sample;
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// 0.0 -> 1.0
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sample = (sample < 0.0f) ? 0.0f : (sample > 1.0f) ? 1.0f : sample;
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if ((m_videoTabIndex == 1) && (m_scopeSink != 0)) { // feed scope buffer only if scope is present and visible
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m_scopeSampleBuffer.push_back(Sample(sample * (SDR_RX_SCALEF - 1.0f), 0.0f));
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}
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//********** gray level **********
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// -0.3 -> 0.7 / 0.7
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sampleVideo = (int) ((sample - m_settings.m_levelBlack) * m_sampleRangeCorrection);
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// 0 -> 255
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sampleVideo = (sampleVideo < 0) ? 0 : (sampleVideo > 255) ? 255 : sampleVideo;
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//********** process video sample **********
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if (m_registeredTVScreen) // can process only if the screen is available (set via the GUI)
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{
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processSample(sample, sampleVideo);
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}
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}
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void ATVDemodSink::applyStandard(int sampleRate, ATVDemodSettings::ATVStd atvStd, float lineDuration)
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{
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switch(atvStd)
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{
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case ATVDemodSettings::ATVStdHSkip:
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// what is left in a line for the image
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m_interleaved = false; // irrelevant
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m_numberOfBlackLines = 0;
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m_numberSamplesHSyncCrop = (int) (0.09f * lineDuration * sampleRate); // 9% of full line empirically
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break;
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case ATVDemodSettings::ATVStdShort:
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// what is left in a line for the image
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m_interleaved = false;
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m_numberOfVSyncLines = 2;
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m_numberOfBlackLines = 4;
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m_firstVisibleLine = 3;
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m_numberSamplesHSyncCrop = (int) (0.085f * lineDuration * sampleRate); // 8.5% of full line empirically
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break;
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case ATVDemodSettings::ATVStdShortInterleaved:
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// what is left in a line for the image
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m_interleaved = true;
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m_numberOfVSyncLines = 2;
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m_numberOfBlackLines = 5;
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m_firstVisibleLine = 3;
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m_numberSamplesHSyncCrop = (int) (0.085f * lineDuration * sampleRate); // 8.5% of full line empirically
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break;
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case ATVDemodSettings::ATVStd819: // 819 lines standard F
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// what is left in a line for the image
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m_interleaved = true;
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m_numberOfVSyncLines = 4;
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m_numberOfBlackLines = 59;
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m_firstVisibleLine = 27;
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m_numberSamplesHSyncCrop = (int) (0.085f * lineDuration * sampleRate); // 8.5% of full line empirically
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break;
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case ATVDemodSettings::ATVStdPAL525: // Follows PAL-M standard
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// what is left in a 64/1.008 us line for the image
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m_interleaved = true;
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m_numberOfVSyncLines = 4;
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m_numberOfBlackLines = 45;
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m_firstVisibleLine = 20;
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m_numberSamplesHSyncCrop = (int) (0.085f * lineDuration * sampleRate); // 8.5% of full line empirically
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break;
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case ATVDemodSettings::ATVStdPAL625: // Follows PAL-B/G/H standard
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default:
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// what is left in a 64 us line for the image
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m_interleaved = true;
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m_numberOfVSyncLines = 3;
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m_numberOfBlackLines = 49;
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m_firstVisibleLine = 23;
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m_numberSamplesHSyncCrop = (int) (0.085f * lineDuration * sampleRate); // 8.5% of full line empirically
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}
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// for now all standards apply this
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// Rec. ITU-R BT.1700
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// Table 2. Details of line synchronizing signals
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m_numberSamplesPerLineSignals = (int)(lineDuration * sampleRate * 12.0 / 64.0); // "a", Line-blanking interval
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m_numberSamplesPerHSync = (int)(lineDuration * sampleRate * 10.5 / 64.0); // "b", Interval between time datum and back edge of line-blanking pulse
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m_numberSamplesPerHTop = (int)(lineDuration * sampleRate * 4.7 / 64.0); // "d", Duration of synchronizing pulse
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// Table 3. Details of field synchronizing signals
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float hl = 32.0f; // half of the line
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float p = 2.35f; // "p", Duration of equalizing pulse
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float q = 27.3f; // "q", Duration of field-synchronizing pulse
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// In the first half of the first line field index is detected
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m_fieldDetectStartPos = (int)(lineDuration * sampleRate * p / 64.0);
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m_fieldDetectEndPos = (int)(lineDuration * sampleRate * q / 64.0);
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// In the second half of the first line vertical synchronization is detected
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m_vSyncDetectStartPos = (int)(lineDuration * sampleRate * (p + hl) / 64.0);
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m_vSyncDetectEndPos = (int)(lineDuration * sampleRate * (q + hl) / 64.0);
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float fieldDetectPercent = 0.75f; // It is better not to detect field index than detect it wrong
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float detectTotalLen = lineDuration * sampleRate * (q - p) / 64.0; // same for field index and vSync detection
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m_fieldDetectThreshold1 = (int)(detectTotalLen * fieldDetectPercent);
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m_fieldDetectThreshold2 = (int)(detectTotalLen * (1.0f - fieldDetectPercent));
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float vSyncDetectPercent = 0.5f;
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m_vSyncDetectThreshold = (int)(detectTotalLen * vSyncDetectPercent);
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}
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bool ATVDemodSink::getBFOLocked()
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{
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if ((m_settings.m_atvModulation == ATVDemodSettings::ATV_USB) || (m_settings.m_atvModulation == ATVDemodSettings::ATV_LSB)) {
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return m_bfoPLL.locked();
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} else {
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return false;
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}
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}
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void ATVDemodSink::applyChannelSettings(int channelSampleRate, int channelFrequencyOffset, bool force)
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{
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qDebug() << "ATVDemodSink::applyChannelSettings:"
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<< " channelSampleRate: " << channelSampleRate
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<< " channelFrequencyOffset: " << channelFrequencyOffset;
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if (channelSampleRate == 0)
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{
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qDebug("ATVDemodSink::applyChannelSettings: aborting");
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return;
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}
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if ((channelFrequencyOffset != m_channelFrequencyOffset) ||
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(channelSampleRate != m_channelSampleRate) || force)
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{
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m_nco.setFreq(-channelFrequencyOffset, channelSampleRate);
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}
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if ((channelSampleRate != m_channelSampleRate) || force)
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{
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unsigned int samplesPerLineNom;
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ATVDemodSettings::getBaseValues(channelSampleRate, m_settings.m_nbLines * m_settings.m_fps, samplesPerLineNom);
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m_samplesPerLine = samplesPerLineNom;
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m_samplesPerLineFrac = (float)channelSampleRate / (m_settings.m_nbLines * m_settings.m_fps) - m_samplesPerLine;
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qDebug() << "ATVDemodSink::applyChannelSettings:"
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<< " m_channelSampleRate: " << m_channelSampleRate
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<< " m_fftBandwidth: " << m_settings.m_fftBandwidth
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<< " m_fftOppBandwidth:" << m_settings.m_fftOppBandwidth
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<< " m_bfoFrequency: " << m_settings.m_bfoFrequency;
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m_channelSampleRate = channelSampleRate;
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m_DSBFilter->create_asym_filter(
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m_settings.m_fftOppBandwidth / (float) m_channelSampleRate,
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m_settings.m_fftBandwidth / (float) m_channelSampleRate
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);
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std::fill(m_DSBFilterBuffer, m_DSBFilterBuffer + m_ssbFftLen, Complex{0.0, 0.0});
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m_DSBFilterBufferIndex = 0;
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m_bfoPLL.configure((float) m_settings.m_bfoFrequency / (float) m_channelSampleRate,
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100.0 / m_channelSampleRate,
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0.01);
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m_bfoFilter.setFrequencies(m_channelSampleRate, m_settings.m_bfoFrequency);
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|
}
|
|
|
|
applyStandard(m_channelSampleRate, m_settings.m_atvStd, ATVDemodSettings::getNominalLineTime(m_settings.m_nbLines, m_settings.m_fps));
|
|
|
|
if (m_registeredTVScreen)
|
|
{
|
|
m_registeredTVScreen->resizeTVScreen(
|
|
m_samplesPerLine - m_numberSamplesPerLineSignals,
|
|
m_settings.m_nbLines - m_numberOfBlackLines
|
|
);
|
|
m_tvScreenBuffer = m_registeredTVScreen->getBackBuffer();
|
|
}
|
|
|
|
m_fieldIndex = 0;
|
|
|
|
m_channelSampleRate = channelSampleRate;
|
|
m_channelFrequencyOffset = channelFrequencyOffset;
|
|
}
|
|
|
|
void ATVDemodSink::applySettings(const ATVDemodSettings& settings, bool force)
|
|
{
|
|
qDebug() << "ATVDemodSink::applySettings:"
|
|
<< "m_inputFrequencyOffset:" << settings.m_inputFrequencyOffset
|
|
<< "m_bfoFrequency:" << settings.m_bfoFrequency
|
|
<< "m_atvModulation:" << settings.m_atvModulation
|
|
<< "m_fmDeviation:" << settings.m_fmDeviation
|
|
<< "m_fftFiltering:" << settings.m_fftFiltering
|
|
<< "m_fftOppBandwidth:" << settings.m_fftOppBandwidth
|
|
<< "m_fftBandwidth:" << settings.m_fftBandwidth
|
|
<< "m_nbLines:" << settings.m_nbLines
|
|
<< "m_fps:" << settings.m_fps
|
|
<< "m_atvStd:" << settings.m_atvStd
|
|
<< "m_hSync:" << settings.m_hSync
|
|
<< "m_vSync:" << settings.m_vSync
|
|
<< "m_invertVideo:" << settings.m_invertVideo
|
|
<< "m_halfFrames:" << settings.m_halfFrames
|
|
<< "m_levelSynchroTop:" << settings.m_levelSynchroTop
|
|
<< "m_levelBlack:" << settings.m_levelBlack
|
|
<< "m_rgbColor:" << settings.m_rgbColor
|
|
<< "m_title:" << settings.m_title
|
|
<< "m_udpAddress:" << settings.m_udpAddress
|
|
<< "m_udpPort:" << settings.m_udpPort
|
|
<< "force:" << force;
|
|
|
|
if ((settings.m_fftBandwidth != m_settings.m_fftBandwidth)
|
|
|| (settings.m_fftOppBandwidth != m_settings.m_fftOppBandwidth) || force)
|
|
{
|
|
m_DSBFilter->create_asym_filter(
|
|
settings.m_fftOppBandwidth / (float) m_channelSampleRate,
|
|
settings.m_fftBandwidth / (float) m_channelSampleRate
|
|
);
|
|
std::fill(m_DSBFilterBuffer, m_DSBFilterBuffer + m_ssbFftLen, Complex{0.0, 0.0});
|
|
m_DSBFilterBufferIndex = 0;
|
|
}
|
|
|
|
if ((settings.m_bfoFrequency != m_settings.m_bfoFrequency) || force)
|
|
{
|
|
m_bfoPLL.configure((float) settings.m_bfoFrequency / (float) m_channelSampleRate,
|
|
100.0 / m_channelSampleRate,
|
|
0.01);
|
|
m_bfoFilter.setFrequencies(m_channelSampleRate, settings.m_bfoFrequency);
|
|
}
|
|
|
|
if ((settings.m_nbLines != m_settings.m_nbLines)
|
|
|| (settings.m_fps != m_settings.m_fps)
|
|
|| (settings.m_atvStd != m_settings.m_atvStd) || force)
|
|
{
|
|
unsigned int samplesPerLineNom;
|
|
ATVDemodSettings::getBaseValues(m_channelSampleRate, settings.m_nbLines * settings.m_fps, samplesPerLineNom);
|
|
m_samplesPerLine = samplesPerLineNom;
|
|
m_samplesPerLineFrac = (float)m_channelSampleRate / (settings.m_nbLines * settings.m_fps) - m_samplesPerLine;
|
|
m_ampAverage.resize(m_samplesPerLine * settings.m_nbLines * 2); // AGC average in two full images
|
|
|
|
qDebug() << "ATVDemodSink::applySettings:"
|
|
<< " m_channelSampleRate: " << m_channelSampleRate
|
|
<< " m_samplesPerLine:" << m_samplesPerLine
|
|
<< " m_samplesPerLineFrac:" << m_samplesPerLineFrac;
|
|
|
|
applyStandard(m_channelSampleRate, settings.m_atvStd,
|
|
ATVDemodSettings::getNominalLineTime(settings.m_nbLines, settings.m_fps));
|
|
|
|
if (m_registeredTVScreen)
|
|
{
|
|
m_registeredTVScreen->resizeTVScreen(
|
|
m_samplesPerLine - m_numberSamplesPerLineSignals,
|
|
settings.m_nbLines - m_numberOfBlackLines
|
|
);
|
|
m_tvScreenBuffer = m_registeredTVScreen->getBackBuffer();
|
|
}
|
|
|
|
m_fieldIndex = 0;
|
|
}
|
|
|
|
if ((settings.m_fmDeviation != m_settings.m_fmDeviation) || force) {
|
|
m_objPhaseDiscri.setFMScaling(1.0f / settings.m_fmDeviation);
|
|
}
|
|
|
|
if ((settings.m_levelBlack != m_settings.m_levelBlack) || force) {
|
|
m_sampleRangeCorrection = 255.0f / (1.0f - m_settings.m_levelBlack);
|
|
}
|
|
|
|
m_settings = settings;
|
|
}
|