126 lines
3.4 KiB
C++
126 lines
3.4 KiB
C++
#include "dsp/spectrumvis.h"
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#include "gui/glspectrum.h"
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#include "dsp/dspcommands.h"
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#include "util/messagequeue.h"
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#define MAX_FFT_SIZE 8192
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#ifdef _WIN32
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double log2f(double n)
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{
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return log(n) / log(2.0);
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}
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#endif
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SpectrumVis::SpectrumVis(GLSpectrum* glSpectrum) :
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SampleSink(),
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m_fft(FFTEngine::create()),
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m_fftBuffer(MAX_FFT_SIZE),
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m_logPowerSpectrum(MAX_FFT_SIZE),
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m_fftBufferFill(0),
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m_glSpectrum(glSpectrum)
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{
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handleConfigure(1024, 10, FFTWindow::BlackmanHarris);
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}
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SpectrumVis::~SpectrumVis()
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{
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delete m_fft;
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}
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void SpectrumVis::configure(MessageQueue* msgQueue, int fftSize, int overlapPercent, FFTWindow::Function window)
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{
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Message* cmd = DSPConfigureSpectrumVis::create(fftSize, overlapPercent, window);
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cmd->submit(msgQueue, this);
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}
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void SpectrumVis::feed(SampleVector::const_iterator begin, SampleVector::const_iterator end, bool firstOfBurst)
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{
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// if no visualisation is set, send the samples to /dev/null
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if(m_glSpectrum == NULL)
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return;
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while(begin < end) {
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size_t todo = end - begin;
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size_t samplesNeeded = m_refillSize - m_fftBufferFill;
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if(todo >= samplesNeeded) {
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// fill up the buffer
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std::vector<Complex>::iterator it = m_fftBuffer.begin() + m_fftBufferFill;
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for(size_t i = 0; i < samplesNeeded; ++i, ++begin)
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*it++ = Complex(begin->real() / 32768.0, begin->imag() / 32768.0);
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// apply fft window (and copy from m_fftBuffer to m_fftIn)
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m_window.apply(&m_fftBuffer[0], m_fft->in());
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// calculate FFT
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m_fft->transform();
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// extract power spectrum and reorder buckets
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Real ofs = 20.0f * log10f(1.0f / m_fftSize);
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Real mult = (10.0f / log2f(10.0f));
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const Complex* fftOut = m_fft->out();
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for(size_t i = 0; i < m_fftSize; i++) {
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Complex c = fftOut[((i + (m_fftSize >> 1)) & (m_fftSize - 1))];
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Real v = c.real() * c.real() + c.imag() * c.imag();
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v = mult * log2f(v) + ofs;
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m_logPowerSpectrum[i] = v;
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}
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// send new data to visualisation
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m_glSpectrum->newSpectrum(m_logPowerSpectrum, m_fftSize);
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// advance buffer respecting the fft overlap factor
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std::copy(m_fftBuffer.begin() + m_refillSize, m_fftBuffer.end(), m_fftBuffer.begin());
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// start over
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m_fftBufferFill = m_overlapSize;
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} else {
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// not enough samples for FFT - just fill in new data and return
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for(std::vector<Complex>::iterator it = m_fftBuffer.begin() + m_fftBufferFill; begin < end; ++begin)
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*it++ = Complex(begin->real() / 32768.0, begin->imag() / 32768.0);
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m_fftBufferFill += todo;
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}
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}
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}
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void SpectrumVis::start()
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{
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}
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void SpectrumVis::stop()
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{
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}
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bool SpectrumVis::handleMessage(Message* message)
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{
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if(DSPConfigureSpectrumVis::match(message)) {
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DSPConfigureSpectrumVis* conf = (DSPConfigureSpectrumVis*)message;
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handleConfigure(conf->getFFTSize(), conf->getOverlapPercent(), conf->getWindow());
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message->completed();
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return true;
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} else {
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return false;
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}
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}
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void SpectrumVis::handleConfigure(int fftSize, int overlapPercent, FFTWindow::Function window)
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{
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if(fftSize > MAX_FFT_SIZE)
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fftSize = MAX_FFT_SIZE;
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else if(fftSize < 64)
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fftSize = 64;
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if(overlapPercent > 100)
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m_overlapPercent = 100;
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else if(overlapPercent < 0)
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m_overlapPercent = 0;
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m_fftSize = fftSize;
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m_overlapPercent = overlapPercent;
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m_fft->configure(m_fftSize, false);
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m_window.create(window, m_fftSize);
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m_overlapSize = (m_fftSize * m_overlapPercent) / 100;
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m_refillSize = m_fftSize - m_overlapSize;
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m_fftBufferFill = m_overlapSize;
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}
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