New Spectrum Analyzer (#4950)
Replace old spectrum analyzer by new one with higher resolution and many new features. Resolves #2847.
This commit is contained in:
Martin Pavelek
committed by
Johannes Lorenz
Johannes Lorenz
parent
73c2c70d96
commit
c3b4d5188a
@@ -40,6 +40,8 @@ public:
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EffectControlDialog( EffectControls * _controls );
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virtual ~EffectControlDialog();
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virtual bool isResizable() const {return false;}
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signals:
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void closed();
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@@ -30,7 +30,6 @@
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#include <QGraphicsDropShadowEffect>
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#include <QMdiSubWindow>
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#include <QLabel>
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#include <QPainter>
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#include <QPushButton>
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#include <QString>
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@@ -2,6 +2,7 @@
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* fft_helpers.h - some functions around FFT analysis
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*
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* Copyright (c) 2008-2012 Tobias Doerffel <tobydox/at/users.sourceforge.net>
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* Copyright (c) 2019 Martin Pavelek <he29.HS/at/gmail.com>
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*
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* This file is part of LMMS - https://lmms.io
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*
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@@ -28,57 +29,90 @@
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#include "lmms_export.h"
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#include <vector>
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#include <fftw3.h>
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const int FFT_BUFFER_SIZE = 2048;
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// NOTE: FFT_BUFFER_SIZE should be considered deprecated!
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// It is used by Eq plugin and some older code here, but this should be a user
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// switchable parameter, not a constant. Use a value from FFT_BLOCK_SIZES
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const unsigned int FFT_BUFFER_SIZE = 2048;
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enum WINDOWS
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// Allowed FFT block sizes. Ranging from barely useful to barely acceptable
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// because of performance and latency reasons.
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const std::vector<unsigned int> FFT_BLOCK_SIZES = {256, 512, 1024, 2048, 4096, 8192, 16384};
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// List of FFT window functions supported by precomputeWindow()
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enum FFT_WINDOWS
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{
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KAISER=1,
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RECTANGLE,
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HANNING,
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HAMMING
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RECTANGULAR = 0,
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BLACKMAN_HARRIS,
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HAMMING,
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HANNING
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};
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/* returns biggest value from abs_spectrum[spec_size] array
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/** Returns biggest value from abs_spectrum[spec_size] array.
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*
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* returns -1 on error
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* @return -1 on error, 0 on success
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*/
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float LMMS_EXPORT maximum( float * _abs_spectrum, unsigned int _spec_size );
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float LMMS_EXPORT maximum(const float *abs_spectrum, unsigned int spec_size);
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float LMMS_EXPORT maximum(const std::vector<float> &abs_spectrum);
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/* apply hanning or hamming window to channel
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/** Normalize the abs_spectrum array of absolute values to a 0..1 range
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* based on supplied energy and stores it in the norm_spectrum array.
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*
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* returns -1 on error
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* @return -1 on error
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*/
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int LMMS_EXPORT hanming( float * _timebuffer, int _length, WINDOWS _type );
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int LMMS_EXPORT normalize(const float *abs_spectrum, float *norm_spectrum, unsigned int bin_count, unsigned int block_size);
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int LMMS_EXPORT normalize(const std::vector<float> &abs_spectrum, std::vector<float> &norm_spectrum, unsigned int block_size);
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/* compute absolute values of complex_buffer, save to absspec_buffer
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* take care that - compl_len is not bigger than complex_buffer!
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* - absspec buffer is big enough!
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/** Check if the spectrum contains any non-zero value.
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*
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* returns 0 on success, else -1
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* @return 1 if spectrum contains any non-zero value
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* @return 0 otherwise
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*/
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int LMMS_EXPORT absspec( fftwf_complex * _complex_buffer, float * _absspec_buffer,
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int _compl_length );
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int LMMS_EXPORT notEmpty(const std::vector<float> &spectrum);
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/* build fewer subbands from many absolute spectrum values
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* take care that - compressedbands[] array num_new elements long
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* - num_old > num_new
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/** Precompute a window function for later real-time use.
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* Set normalized to false if you do not want to apply amplitude correction.
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*
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* returns 0 on success, else -1
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* @return -1 on error
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*/
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int LMMS_EXPORT compressbands( float * _absspec_buffer, float * _compressedband,
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int _num_old, int _num_new, int _bottom, int _top );
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int LMMS_EXPORT precomputeWindow(float *window, unsigned int length, FFT_WINDOWS type, bool normalized = true);
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int LMMS_EXPORT calc13octaveband31( float * _absspec_buffer, float * _subbands,
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int _num_spec, float _max_frequency );
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/* compute power of finite time sequence
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* take care num_values is length of timesignal[]
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/** Compute absolute values of complex_buffer, save to absspec_buffer.
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* Take care that - compl_len is not bigger than complex_buffer!
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* - absspec buffer is big enough!
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*
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* returns power on success, else -1
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* @return 0 on success, else -1
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*/
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float LMMS_EXPORT signalpower(float *timesignal, int num_values);
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int LMMS_EXPORT absspec(const fftwf_complex *complex_buffer, float *absspec_buffer,
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unsigned int compl_length);
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/** Build fewer subbands from many absolute spectrum values.
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* Take care that - compressedbands[] array num_new elements long
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* - num_old > num_new
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*
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* @return 0 on success, else -1
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*/
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int LMMS_EXPORT compressbands(const float * _absspec_buffer, float * _compressedband,
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int _num_old, int _num_new, int _bottom, int _top);
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int LMMS_EXPORT calc13octaveband31(float * _absspec_buffer, float * _subbands,
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int _num_spec, float _max_frequency);
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/** Compute power of finite time sequence.
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* Take care num_values is length of timesignal[].
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*
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* @return power on success, else -1
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*/
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float LMMS_EXPORT signalpower(const float *timesignal, int num_values);
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#endif
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