mirror of
https://github.com/xiph/opus.git
synced 2025-05-14 23:48:28 +00:00
61 lines
2.2 KiB
C
61 lines
2.2 KiB
C
/* 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.
|
|
*/
|
|
|
|
#ifndef FREQ_H
|
|
#define FREQ_H
|
|
|
|
#include "kiss_fft.h"
|
|
|
|
#define LPC_ORDER 16
|
|
|
|
#define PREEMPHASIS (0.85f)
|
|
|
|
#define FRAME_SIZE_5MS (2)
|
|
#define OVERLAP_SIZE_5MS (2)
|
|
#define TRAINING_OFFSET_5MS (1)
|
|
|
|
#define WINDOW_SIZE_5MS (FRAME_SIZE_5MS + OVERLAP_SIZE_5MS)
|
|
|
|
#define FRAME_SIZE (80*FRAME_SIZE_5MS)
|
|
#define OVERLAP_SIZE (80*OVERLAP_SIZE_5MS)
|
|
#define TRAINING_OFFSET (80*TRAINING_OFFSET_5MS)
|
|
#define WINDOW_SIZE (FRAME_SIZE + OVERLAP_SIZE)
|
|
#define FREQ_SIZE (WINDOW_SIZE/2 + 1)
|
|
|
|
#define NB_BANDS 18
|
|
#define NB_BANDS_1 (NB_BANDS - 1)
|
|
|
|
void lpcn_compute_band_energy(float *bandE, const kiss_fft_cpx *X);
|
|
void burg_cepstral_analysis(float *ceps, const float *x);
|
|
|
|
void apply_window(float *x);
|
|
void dct(float *out, const float *in);
|
|
void forward_transform(kiss_fft_cpx *out, const float *in);
|
|
float lpc_from_cepstrum(float *lpc, const float *cepstrum);
|
|
void apply_window(float *x);
|
|
void lpc_weighting(float *lpc, float gamma);
|
|
|
|
#endif
|