ref: 590e9ce41d2ea3af73d019367d7c06ea9ca8fc68
dir: /dnn/freq.h/
/* Copyright (c) 2017-2018 Mozilla */
/*
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions
are met:
- Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
- Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following disclaimer in the
documentation and/or other materials provided with the distribution.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR
CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#define PREEMPHASIS (0.85f)
#define FRAME_SIZE_SHIFT 2
#define FRAME_SIZE (40<<FRAME_SIZE_SHIFT)
#define WINDOW_SIZE (2*FRAME_SIZE)
#define FREQ_SIZE (FRAME_SIZE + 1)
#define NB_BANDS 18
#ifndef RNNOISE_EXPORT
# if defined(WIN32)
# if defined(RNNOISE_BUILD) && defined(DLL_EXPORT)
# define RNNOISE_EXPORT __declspec(dllexport)
# else
# define RNNOISE_EXPORT
# endif
# elif defined(__GNUC__) && defined(RNNOISE_BUILD)
# define RNNOISE_EXPORT __attribute__ ((visibility ("default")))
# else
# define RNNOISE_EXPORT
# endif
#endif
typedef struct DenoiseState DenoiseState;
RNNOISE_EXPORT int rnnoise_get_size();
RNNOISE_EXPORT int rnnoise_init(DenoiseState *st);
RNNOISE_EXPORT DenoiseState *rnnoise_create();
RNNOISE_EXPORT void rnnoise_destroy(DenoiseState *st);
RNNOISE_EXPORT float rnnoise_process_frame(DenoiseState *st, float *out, const float *in);
void compute_band_energy(float *bandE, const kiss_fft_cpx *X);
void compute_band_corr(float *bandE, const kiss_fft_cpx *X, const kiss_fft_cpx *P);
void apply_window(float *x);
void dct(float *out, const float *in);
void idct(float *out, const float *in);
void forward_transform(kiss_fft_cpx *out, const float *in);
void inverse_transform(float *out, const kiss_fft_cpx *in);
float lpc_from_bands(float *lpc, const float *Ex);
float lpc_from_cepstrum(float *lpc, const float *cepstrum);
void apply_window(float *x);