Modified source engine (2017) developed by valve and leaked in 2020. Not for commercial purporses
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/* Copyright (C) 2002 Jean-Marc Valin
File: ltp.h
Long-Term Prediction functions
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.
- Neither the name of the Xiph.org Foundation nor the names of its
contributors may be used to endorse or promote products derived from
this software without specific prior written permission.
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.
*/
#include "speex_bits.h"
typedef struct ltp_params {
signed char *gain_cdbk;
int gain_bits;
int pitch_bits;
} ltp_params;
void open_loop_nbest_pitch(float *sw, int start, int end, int len, int *pitch, float *gain, int N, char *stack);
/** Finds the best quantized 3-tap pitch predictor by analysis by synthesis */
int pitch_search_3tap(
float target[], /* Target vector */
float *sw,
float ak[], /* LPCs for this subframe */
float awk1[], /* Weighted LPCs #1 for this subframe */
float awk2[], /* Weighted LPCs #2 for this subframe */
float exc[], /* Overlapping codebook */
void *par,
int start, /* Smallest pitch value allowed */
int end, /* Largest pitch value allowed */
float pitch_coef, /* Voicing (pitch) coefficient */
int p, /* Number of LPC coeffs */
int nsf, /* Number of samples in subframe */
SpeexBits *bits,
char *stack,
float *exc2,
float *r,
int complexity
);
/*Unquantize adaptive codebook and update pitch contribution*/
void pitch_unquant_3tap(
float exc[], /* Excitation */
int start, /* Smallest pitch value allowed */
int end, /* Largest pitch value allowed */
float pitch_coef, /* Voicing (pitch) coefficient */
void *par,
int nsf, /* Number of samples in subframe */
int *pitch_val,
float *gain_val,
SpeexBits *bits,
char *stack,
int lost,
int subframe_offset,
float last_pitch_gain
);
float pitch_gain_search_3tap(
float target[], /* Target vector */
float ak[], /* LPCs for this subframe */
float awk1[], /* Weighted LPCs #1 for this subframe */
float awk2[], /* Weighted LPCs #2 for this subframe */
float exc[], /* Excitation */
void *par,
int pitch, /* Pitch value */
int p, /* Number of LPC coeffs */
int nsf, /* Number of samples in subframe */
SpeexBits *bits,
char *stack,
float *exc2,
float *r,
int *cdbk_index
);
/** Forced pitch delay and gain */
int forced_pitch_quant(
float target[], /* Target vector */
float *sw,
float ak[], /* LPCs for this subframe */
float awk1[], /* Weighted LPCs #1 for this subframe */
float awk2[], /* Weighted LPCs #2 for this subframe */
float exc[], /* Excitation */
void *par,
int start, /* Smallest pitch value allowed */
int end, /* Largest pitch value allowed */
float pitch_coef, /* Voicing (pitch) coefficient */
int p, /* Number of LPC coeffs */
int nsf, /* Number of samples in subframe */
SpeexBits *bits,
char *stack,
float *exc2,
float *r,
int complexity
);
/** Unquantize forced pitch delay and gain */
void forced_pitch_unquant(
float exc[], /* Excitation */
int start, /* Smallest pitch value allowed */
int end, /* Largest pitch value allowed */
float pitch_coef, /* Voicing (pitch) coefficient */
void *par,
int nsf, /* Number of samples in subframe */
int *pitch_val,
float *gain_val,
SpeexBits *bits,
char *stack,
int lost,
int subframe_offset,
float last_pitch_gain
);