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sdrangel/plugins/channelrx/demodatv/atvdemodsink.h

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15 KiB
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///////////////////////////////////////////////////////////////////////////////////
// Copyright (C) 2019 Edouard Griffiths, F4EXB //
// //
// 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_ATVDEMODSINK_H
#define INCLUDE_ATVDEMODSINK_H
#include <QElapsedTimer>
#include <vector>
#include "dsp/channelsamplesink.h"
#include "dsp/basebandsamplesink.h"
#include "dsp/nco.h"
#include "dsp/interpolator.h"
#include "dsp/fftfilt.h"
#include "dsp/agc.h"
#include "dsp/phaselock.h"
#include "dsp/recursivefilters.h"
#include "dsp/phasediscri.h"
#include "audio/audiofifo.h"
#include "util/movingaverage.h"
#include "gui/tvscreen.h"
#include "atvdemodsettings.h"
class ATVDemodSink : public ChannelSampleSink {
public:
ATVDemodSink();
~ATVDemodSink();
virtual void feed(const SampleVector::const_iterator& begin, const SampleVector::const_iterator& end);
void setScopeSink(BasebandSampleSink* scopeSink) { m_scopeSink = scopeSink; }
void setTVScreen(TVScreen *tvScreen) { m_registeredTVScreen = tvScreen; } //!< set by the GUI
double getMagSq() const { return m_magSqAverage; } //!< Beware this is scaled to 2^30
bool getBFOLocked();
void setVideoTabIndex(int videoTabIndex) { m_videoTabIndex = videoTabIndex; }
void applyChannelSettings(int channelSampleRate, int channelFrequencyOffset, bool force = false);
void applySettings(const ATVDemodSettings& settings, bool force = false);
private:
struct ATVConfigPrivate
{
int m_intTVSampleRate;
int m_intNumberSamplePerLine;
ATVConfigPrivate() :
m_intTVSampleRate(0),
m_intNumberSamplePerLine(0)
{}
};
/**
* Exponential average using integers and alpha as the inverse of a power of two
*/
class AvgExpInt
{
public:
AvgExpInt(int log2Alpha) : m_log2Alpha(log2Alpha), m_m1(0), m_start(true) {}
void reset() { m_start = true; }
int run(int m0)
{
if (m_start)
{
m_m1 = m0;
m_start = false;
return m0;
}
else
{
m_m1 = m0 + m_m1 - (m_m1>>m_log2Alpha);
return m_m1>>m_log2Alpha;
}
}
private:
int m_log2Alpha;
int m_m1;
bool m_start;
};
int m_channelSampleRate;
int m_channelFrequencyOffset;
int m_tvSampleRate;
unsigned int m_samplesPerLineNom; //!< number of samples per complete line (includes sync signals) - nominal value
unsigned int m_samplesPerLine; //!< number of samples per complete line (includes sync signals) - adusted value
ATVDemodSettings m_settings;
int m_videoTabIndex;
//*************** SCOPE ***************
BasebandSampleSink* m_scopeSink;
SampleVector m_scopeSampleBuffer;
//*************** ATV PARAMETERS ***************
TVScreen *m_registeredTVScreen;
//int m_intNumberSamplePerLine;
int m_numberSamplesPerHTopNom; //!< number of samples per horizontal synchronization pulse (pulse in ultra-black) - nominal value
int m_numberSamplesPerHTop; //!< number of samples per horizontal synchronization pulse (pulse in ultra-black) - adusted value
int m_numberOfSyncLines; //!< this is the number of non displayable lines at the start of a frame. First displayable row comes next.
int m_numberOfBlackLines; //!< this is the total number of lines not part of the image and is used for vertical screen size
int m_numberOfEqLines; //!< number of equalizing lines both whole and partial
int m_numberSamplesPerLineSignals; //!< number of samples in the non image part of the line (signals = front porch + pulse + back porch)
int m_numberSamplesPerHSync; //!< number of samples per horizontal synchronization pattern (pulse + back porch)
int m_numberSamplesHSyncCrop; //!< number of samples to crop from start of horizontal synchronization
bool m_interleaved; //!< interleaved image
int m_firstRowIndexEven; //!< index of the first row of an even image
int m_firstRowIndexOdd; //!< index of the first row of an even image
//*************** PROCESSING ***************
int m_imageIndex;
int m_synchroSamples;
bool m_verticalSynchroDetected;
float m_ampLineSum;
float m_ampLineAvg;
float m_effMin;
float m_effMax;
float m_ampMin;
float m_ampMax;
float m_ampDelta; //!< calculated amplitude of HSync pulse (should be ~0.3f)
float m_fltBufferI[6];
float m_fltBufferQ[6];
int m_colIndex;
int m_sampleIndex;
int m_amSampleIndex;
int m_rowIndex;
int m_lineIndex;
AvgExpInt m_objAvgColIndex;
int m_avgColIndex;
SampleVector m_sampleBuffer;
//*************** RF ***************
MovingAverageUtil<double, double, 32> m_magSqAverage;
MovingAverageUtilVar<double, double> m_ampAverage;
NCO m_nco;
SimplePhaseLock m_bfoPLL;
SecondOrderRecursiveFilter m_bfoFilter;
// Interpolator group for decimation and/or double sideband RF filtering
Interpolator m_interpolator;
Real m_interpolatorDistance;
Real m_interpolatorDistanceRemain;
// Used for vestigial SSB with asymmetrical filtering (needs double sideband scheme)
fftfilt* m_DSBFilter;
Complex* m_DSBFilterBuffer;
int m_DSBFilterBufferIndex;
static const int m_ssbFftLen;
// Used for FM
PhaseDiscriminators m_objPhaseDiscri;
//QElapsedTimer m_objTimer;
void demod(Complex& c);
void applyStandard(int sampleRate, const ATVDemodSettings& settings, float lineDuration);
// Vertical sync is obtained by skipping horizontal sync on the line that triggers vertical sync (new frame)
inline void processHSkip(float& sample, int& sampleVideo)
{
// Fill pixel on the current line - column index 0 is reference at start of sync remove only sync length empirically
m_registeredTVScreen->setDataColor(m_colIndex - m_numberSamplesHSyncCrop, sampleVideo, sampleVideo, sampleVideo);
// Horizontal Synchro detection
// Floor Detection (0.1 nominal)
if (sample < m_settings.m_levelSynchroTop)
{
m_synchroSamples++;
}
// Black detection (0.3 nominal)
else if (sample > m_settings.m_levelBlack) {
m_synchroSamples = 0;
}
// H sync pulse
if (m_synchroSamples == m_numberSamplesPerHTop) // horizontal synchro detected
{
// Vertical sync and image rendering
if ((m_sampleIndex >= (3*m_samplesPerLine) / 2) // Vertical sync is first horizontal sync after skip (count at least 1.5 line length)
|| (!m_settings.m_vSync && (m_lineIndex >= m_settings.m_nbLines))) // Vsync ignored and reached nominal number of lines per frame
{
// qDebug("ATVDemodSink::processHSkip: %sVSync: co: %d sa: %d li: %d",
// (m_settings.m_vSync ? "" : "no "), m_colIndex, m_sampleIndex, m_lineIndex);
m_avgColIndex = m_colIndex;
m_registeredTVScreen->renderImage(0);
m_imageIndex++;
m_lineIndex = 0;
m_rowIndex = 0;
m_registeredTVScreen->selectRow(m_rowIndex);
}
m_sampleIndex = 0; // reset after H sync
}
else
{
m_sampleIndex++;
}
if (m_colIndex < m_samplesPerLine + m_numberSamplesPerHTop - 1) // increment until full line + next horizontal pulse
{
m_colIndex++;
}
else // full line + next horizontal pulse => start of screen reference line
{
// set column index to start a new line
if (m_settings.m_hSync && (m_lineIndex == 0)) { // start of a new frame - readjust sync position
m_colIndex = m_numberSamplesPerHTop + (m_samplesPerLine - m_avgColIndex) / 2; // amortizing factor 1/2
} else { // reset column index at end of sync pulse normally
m_colIndex = m_numberSamplesPerHTop;
}
m_lineIndex++; // new line
m_rowIndex++; // new row
if (m_rowIndex < m_settings.m_nbLines) {
m_registeredTVScreen->selectRow(m_rowIndex);
}
}
}
// Vertical sync is obtained when the average level of signal on a line is below a certain threshold. This is obtained by lowering signal to ultra black during at least 3/4th of the line
// We use directly the sum of line sample values
inline void processClassic(float& sample, int& sampleVideo)
{
// Filling pixel on the current line - reference index 0 at start of sync pulse
// remove only sync pulse empirically, +4 is to compensate shift due to hsync amortizing factor of 1/4
m_registeredTVScreen->setDataColor(m_colIndex - m_numberSamplesPerHSync + m_numberSamplesPerHTop, sampleVideo, sampleVideo, sampleVideo);
int synchroTimeSamples = (3 * m_samplesPerLine) / 4; // count 3/4 line globally
float synchroTrameLevel = 0.5f * ((float) synchroTimeSamples) * m_settings.m_levelBlack; // threshold is half the black value over 3/4th of line samples
// Horizontal Synchro detection
// Floor Detection 0
if (sample < m_settings.m_levelSynchroTop)
{
m_synchroSamples++;
}
// Black detection 0.3
else if (sample > m_settings.m_levelBlack) {
m_synchroSamples = 0;
}
//Horizontal Synchro processing
if ((m_synchroSamples == m_numberSamplesPerHTop) // horizontal synchro detected
&& (m_sampleIndex > (m_samplesPerLine/2) + m_numberSamplesPerLineSignals))
{
m_avgColIndex = m_sampleIndex - m_colIndex;
//qDebug("HSync: %d %d %d", m_sampleIndex, m_colIndex, m_avgColIndex);
m_sampleIndex = 0;
}
else
{
m_sampleIndex++;
}
if (m_colIndex < m_samplesPerLine + m_numberSamplesPerHTop - 1) // increment until full line + next horizontal pulse
{
m_colIndex++;
if (m_colIndex < (m_samplesPerLine/2)) { // count on first half of line for better separation between black and ultra black
m_ampLineSum += sample;
}
}
else // full line + next horizontal pulse => start of screen reference line
{
m_ampLineAvg = m_ampLineSum / ((m_samplesPerLine/2) - m_numberSamplesPerHTop); // avg length is half line less horizontal top
m_ampLineSum = 0.0f;
// set column index to start a new line
if (m_settings.m_hSync && (m_lineIndex == 0)) {
m_colIndex = m_numberSamplesPerHTop + m_avgColIndex/4; // amortizing 1/4
} else {
m_colIndex = m_numberSamplesPerHTop;
}
// process line
m_lineIndex++; // new line
m_rowIndex += m_interleaved ? 2 : 1; // new row considering interleaving
if (m_rowIndex < m_settings.m_nbLines) {
m_registeredTVScreen->selectRow(m_rowIndex - m_numberOfSyncLines);
}
}
// Vertical sync and image rendering
if (m_lineIndex > m_numberOfBlackLines) {
m_verticalSynchroDetected = false; // reset trigger when detection zone is left
}
if ((m_settings.m_vSync) && (m_lineIndex <= m_settings.m_nbLines)) // VSync activated and lines in range
{
if (m_colIndex >= synchroTimeSamples)
{
if (m_ampLineAvg < 0.15f) // ultra black detection
{
if (!m_verticalSynchroDetected) // not yet
{
m_verticalSynchroDetected = true; // prevent repetition
// Odd frame or not interleaved
if ((m_imageIndex % 2 == 1) || !m_interleaved) {
m_registeredTVScreen->renderImage(0);
}
if (m_lineIndex > m_settings.m_nbLines/2) { // long frame done (even)
m_imageIndex = m_firstRowIndexOdd; // next is odd
} else {
m_imageIndex = m_firstRowIndexEven; // next is even
}
if (m_interleaved) {
m_rowIndex = m_imageIndex;
} else {
m_rowIndex = 0; // just the first line
}
// qDebug("ATVDemodSink::processClassic: m_lineIndex: %d m_imageIndex: %d m_rowIndex: %d",
// m_lineIndex, m_imageIndex, m_rowIndex);
m_registeredTVScreen->selectRow(m_rowIndex - m_numberOfSyncLines);
m_lineIndex = 0;
m_imageIndex++;
}
}
}
}
else // no VSync or lines out of range => set new image arbitrarily
{
if (m_lineIndex >= m_settings.m_nbLines/2)
{
if (m_lineIndex > m_settings.m_nbLines/2) { // long frame done (even)
m_imageIndex = m_firstRowIndexOdd; // next is odd
} else {
m_imageIndex = m_firstRowIndexEven; // next is even
}
if (m_interleaved) {
m_rowIndex = m_imageIndex;
} else {
m_rowIndex = 0; // just the first line
}
m_registeredTVScreen->selectRow(m_rowIndex - m_numberOfSyncLines);
m_lineIndex = 0;
m_imageIndex++;
}
}
}
};
#endif // INCLUDE_ATVDEMODSINK_H
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