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79 lines
3.7 KiB
C
79 lines
3.7 KiB
C
/*
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libspecbleach - A spectral processing library
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Copyright 2022 Luciano Dato <lucianodato@gmail.com>
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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This library 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 GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with this library; if not, write to the Free Software
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Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#ifndef SPECTRAL_UTILS_H
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#define SPECTRAL_UTILS_H
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#include <stdbool.h>
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#include <stdint.h>
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typedef enum WindowTypes {
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HANN_WINDOW = 0,
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HAMMING_WINDOW = 1,
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BLACKMAN_WINDOW = 2,
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VORBIS_WINDOW = 3
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} WindowTypes;
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bool get_fft_window(float* window, uint32_t fft_size, WindowTypes window_type);
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bool initialize_spectrum_with_value(float* spectrum, uint32_t spectrum_size,
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float value);
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bool direct_matrix_to_vector_spectral_convolution(const float* matrix_spectum,
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const float* spectrum,
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float* out_spectrum,
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uint32_t spectrum_size);
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float max_spectral_value(const float* spectrum, uint32_t real_spectrum_size);
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float min_spectral_value(const float* spectrum, uint32_t real_spectrum_size);
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#define min_spectrum(spectrum_one, spectrum_two, spectrum_size) \
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_Generic((spectrum_one), \
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float*: min_spectrum_float, \
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double*: min_spectrum_double, \
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default: min_spectrum_float)(spectrum_one, spectrum_two, spectrum_size)
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#define max_spectrum(spectrum_one, spectrum_two, spectrum_size) \
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_Generic((spectrum_one), \
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float*: max_spectrum_float, \
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double*: max_spectrum_double, \
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default: max_spectrum_float)(spectrum_one, spectrum_two, spectrum_size)
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bool min_spectrum_float(float* spectrum_one, const float* spectrum_two,
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uint32_t spectrum_size);
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bool max_spectrum_float(float* spectrum_one, const float* spectrum_two,
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uint32_t spectrum_size);
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bool min_spectrum_double(double* spectrum_one, const double* spectrum_two,
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uint32_t spectrum_size);
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bool max_spectrum_double(double* spectrum_one, const double* spectrum_two,
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uint32_t spectrum_size);
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float fft_bin_to_freq(uint32_t bin_index, uint32_t sample_rate,
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uint32_t fft_size);
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uint32_t freq_to_fft_bin(float freq, uint32_t sample_rate, uint32_t fft_size);
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float spectral_flux(const float* spectrum, const float* previous_spectrum,
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uint32_t spectrum_size);
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bool get_rolling_mean_spectrum(float* averaged_spectrum,
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const float* current_spectrum,
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uint32_t number_of_blocks,
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uint32_t spectrum_size);
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bool get_rolling_median_spectrum(float* median_spectrum,
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const float* current_spectrum_buffer,
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uint32_t number_of_blocks,
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uint32_t spectrum_size);
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#endif
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