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Fixed waterfall at very low samplerates

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This commit is contained in:
Ryzerth
2021-07-31 16:36:04 +02:00
parent c13eb950b2
commit ee5b89c4aa
5 changed files with 86 additions and 48 deletions
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34
core/src/gui/main_window.cpp
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@ -38,9 +38,6 @@ void MainWindow::init() {
gui::waterfall.init();
gui::waterfall.setRawFFTSize(fftSize);
appliedWindow = new float[fftSize];
generateFFTWindow(selectedWindow, fftSize);
credits::init();
core::configManager.acquire();
@ -215,10 +212,14 @@ void MainWindow::init() {
void MainWindow::fftHandler(dsp::complex_t* samples, int count, void* ctx) {
MainWindow* _this = (MainWindow*)ctx;
std::lock_guard<std::mutex> lck(_this->fft_mtx);
if (count != _this->fftSize) { return; }
// Apply window
volk_32fc_32f_multiply_32fc((lv_32fc_t*)_this->fft_in, (lv_32fc_t*)samples, _this->appliedWindow, count);
volk_32fc_32f_multiply_32fc((lv_32fc_t*)_this->fft_in, (lv_32fc_t*)samples, sigpath::signalPath.fftTaps, count);
// Zero out the rest of the samples
if (count < _this->fftSize) {
memset(&_this->fft_in[count], 0, (_this->fftSize-count) * sizeof(dsp::complex_t));
}
// Execute FFT
fftwf_execute(_this->fftwPlan);
@ -231,7 +232,7 @@ void MainWindow::fftHandler(dsp::complex_t* samples, int count, void* ctx) {
}
// Take power of spectrum
volk_32fc_s32f_power_spectrum_32f(fftBuf, (lv_32fc_t*)_this->fft_out, count, count);
volk_32fc_s32f_power_spectrum_32f(fftBuf, (lv_32fc_t*)_this->fft_out, _this->fftSize, _this->fftSize);
// Push back data
gui::waterfall.pushFFT();
@ -663,30 +664,11 @@ void MainWindow::setFFTSize(int size) {
fft_in = (fftwf_complex*)fftwf_malloc(sizeof(fftwf_complex) * fftSize);
fft_out = (fftwf_complex*)fftwf_malloc(sizeof(fftwf_complex) * fftSize);
fftwPlan = fftwf_plan_dft_1d(fftSize, fft_in, fft_out, FFTW_FORWARD, FFTW_ESTIMATE);
delete appliedWindow;
appliedWindow = new float[fftSize];
generateFFTWindow(selectedWindow, fftSize);
}
void MainWindow::setFFTWindow(int win) {
std::lock_guard<std::mutex> lck(fft_mtx);
selectedWindow = win;
generateFFTWindow(selectedWindow, fftSize);
}
void MainWindow::generateFFTWindow(int win, int size) {
if (win == FFT_WINDOW_RECTANGULAR) {
for (int i = 0; i < size; i++) {
appliedWindow[i] = (i%2) ? 1 : -1;
}
}
else if (win == FFT_WINDOW_BLACKMAN) {
for (int i = 0; i < size; i++) {
appliedWindow[i] = ((i%2) ? dsp::window_function::blackman(i, size) : -dsp::window_function::blackman(i, size))*2;
}
}
sigpath::signalPath.setFFTWindow(win);
}
bool MainWindow::isPlaying() {