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https://github.com/miek/inspectrum.git
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193ace6e6c
Pull in selection support for setting centre freq & lowpass Conflicts: CMakeLists.txt inputsource.h mainwindow.h spectrogram.cpp spectrogram.h spectrogramcontrols.cpp
105 lines
2.6 KiB
C++
105 lines
2.6 KiB
C++
/*
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* Copyright (C) 2015, Mike Walters <mike@flomp.net>
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*
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* This file is part of inspectrum.
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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, either 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 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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#pragma once
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#include <QCache>
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#include <QWidget>
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#include "fft.h"
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#include "inputsource.h"
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#include <memory>
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#include <math.h>
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static const double Tau = M_PI * 2.0;
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class TileCacheKey;
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class Spectrogram : public QWidget
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{
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Q_OBJECT
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public:
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Spectrogram();
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~Spectrogram();
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QSize sizeHint() const;
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int getHeight();
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int getStride();
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off_t lineToSample(off_t line);
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InputSource *inputSource = nullptr;
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public slots:
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void openFile(QString fileName);
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void setSampleRate(int rate);
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void setFFTSize(int size);
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void setPowerMax(int power);
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void setPowerMin(int power);
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void setZoomLevel(int zoom);
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protected:
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void paintEvent(QPaintEvent *event);
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private:
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const int linesPerGraduation = 50;
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const int tileSize = 65536; // This must be a multiple of the maximum FFT size
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FFT *fft = nullptr;
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std::unique_ptr<float[]> window;
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fftwf_complex *lineBuffer = nullptr;
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QCache<TileCacheKey, QPixmap> pixmapCache;
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QCache<TileCacheKey, float> fftCache;
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uint colormap[256];
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int sampleRate;
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int fftSize;
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int zoomLevel;
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float powerMax;
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float powerMin;
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QPixmap* getPixmapTile(off_t tile);
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float* getFFTTile(off_t tile);
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void getLine(float *dest, off_t sample);
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void paintTimeAxis(QPainter *painter, QRect rect);
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int sampleToLine(off_t sample);
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QString sampleToTime(off_t sample);
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int linesPerTile();
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};
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class TileCacheKey
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{
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public:
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TileCacheKey(int fftSize, int zoomLevel, off_t sample) {
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this->fftSize = fftSize;
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this->zoomLevel = zoomLevel;
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this->sample = sample;
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}
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bool operator==(const TileCacheKey &k2) const {
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return (this->fftSize == k2.fftSize) &&
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(this->zoomLevel == k2.zoomLevel) &&
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(this->sample == k2.sample);
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}
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int fftSize;
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int zoomLevel;
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off_t sample;
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};
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