forked from Mirrors/freeswitch
4ee40ddc34
git-svn-id: http://svn.freeswitch.org/svn/freeswitch/trunk@11979 d0543943-73ff-0310-b7d9-9358b9ac24b2
142 lines
5.4 KiB
C
142 lines
5.4 KiB
C
/* Copyright (C) 2002 Jean-Marc Valin */
|
|
/**
|
|
@file ltp.h
|
|
@brief 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/speex_bits.h>
|
|
#include "arch.h"
|
|
|
|
/** LTP parameters. */
|
|
typedef struct {
|
|
const signed char *gain_cdbk;
|
|
int gain_bits;
|
|
int pitch_bits;
|
|
} ltp_params;
|
|
|
|
#ifdef FIXED_POINT
|
|
#define gain_3tap_to_1tap(g) (ABS(g[1]) + (g[0]>0 ? g[0] : -SHR16(g[0],1)) + (g[2]>0 ? g[2] : -SHR16(g[2],1)))
|
|
#else
|
|
#define gain_3tap_to_1tap(g) (ABS(g[1]) + (g[0]>0 ? g[0] : -.5*g[0]) + (g[2]>0 ? g[2] : -.5*g[2]))
|
|
#endif
|
|
|
|
spx_word32_t inner_prod(const spx_word16_t *x, const spx_word16_t *y, int len);
|
|
void pitch_xcorr(const spx_word16_t *_x, const spx_word16_t *_y, spx_word32_t *corr, int len, int nb_pitch, char *stack);
|
|
|
|
void open_loop_nbest_pitch(spx_word16_t *sw, int start, int end, int len, int *pitch, spx_word16_t *gain, int N, char *stack);
|
|
|
|
|
|
/** Finds the best quantized 3-tap pitch predictor by analysis by synthesis */
|
|
int pitch_search_3tap(
|
|
spx_word16_t target[], /* Target vector */
|
|
spx_word16_t *sw,
|
|
spx_coef_t ak[], /* LPCs for this subframe */
|
|
spx_coef_t awk1[], /* Weighted LPCs #1 for this subframe */
|
|
spx_coef_t awk2[], /* Weighted LPCs #2 for this subframe */
|
|
spx_sig_t exc[], /* Overlapping codebook */
|
|
const void *par,
|
|
int start, /* Smallest pitch value allowed */
|
|
int end, /* Largest pitch value allowed */
|
|
spx_word16_t pitch_coef, /* Voicing (pitch) coefficient */
|
|
int p, /* Number of LPC coeffs */
|
|
int nsf, /* Number of samples in subframe */
|
|
SpeexBits *bits,
|
|
char *stack,
|
|
spx_word16_t *exc2,
|
|
spx_word16_t *r,
|
|
int complexity,
|
|
int cdbk_offset,
|
|
int plc_tuning,
|
|
spx_word32_t *cumul_gain
|
|
);
|
|
|
|
/*Unquantize adaptive codebook and update pitch contribution*/
|
|
void pitch_unquant_3tap(
|
|
spx_word16_t exc[], /* Input excitation */
|
|
spx_word32_t exc_out[], /* Output excitation */
|
|
int start, /* Smallest pitch value allowed */
|
|
int end, /* Largest pitch value allowed */
|
|
spx_word16_t pitch_coef, /* Voicing (pitch) coefficient */
|
|
const void *par,
|
|
int nsf, /* Number of samples in subframe */
|
|
int *pitch_val,
|
|
spx_word16_t *gain_val,
|
|
SpeexBits *bits,
|
|
char *stack,
|
|
int lost,
|
|
int subframe_offset,
|
|
spx_word16_t last_pitch_gain,
|
|
int cdbk_offset
|
|
);
|
|
|
|
/** Forced pitch delay and gain */
|
|
int forced_pitch_quant(
|
|
spx_word16_t target[], /* Target vector */
|
|
spx_word16_t *sw,
|
|
spx_coef_t ak[], /* LPCs for this subframe */
|
|
spx_coef_t awk1[], /* Weighted LPCs #1 for this subframe */
|
|
spx_coef_t awk2[], /* Weighted LPCs #2 for this subframe */
|
|
spx_sig_t exc[], /* Excitation */
|
|
const void *par,
|
|
int start, /* Smallest pitch value allowed */
|
|
int end, /* Largest pitch value allowed */
|
|
spx_word16_t pitch_coef, /* Voicing (pitch) coefficient */
|
|
int p, /* Number of LPC coeffs */
|
|
int nsf, /* Number of samples in subframe */
|
|
SpeexBits *bits,
|
|
char *stack,
|
|
spx_word16_t *exc2,
|
|
spx_word16_t *r,
|
|
int complexity,
|
|
int cdbk_offset,
|
|
int plc_tuning,
|
|
spx_word32_t *cumul_gain
|
|
);
|
|
|
|
/** Unquantize forced pitch delay and gain */
|
|
void forced_pitch_unquant(
|
|
spx_word16_t exc[], /* Input excitation */
|
|
spx_word32_t exc_out[], /* Output excitation */
|
|
int start, /* Smallest pitch value allowed */
|
|
int end, /* Largest pitch value allowed */
|
|
spx_word16_t pitch_coef, /* Voicing (pitch) coefficient */
|
|
const void *par,
|
|
int nsf, /* Number of samples in subframe */
|
|
int *pitch_val,
|
|
spx_word16_t *gain_val,
|
|
SpeexBits *bits,
|
|
char *stack,
|
|
int lost,
|
|
int subframe_offset,
|
|
spx_word16_t last_pitch_gain,
|
|
int cdbk_offset
|
|
);
|