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142 lines
5.4 KiB
C
142 lines
5.4 KiB
C
/* Copyright (C) 2002 Jean-Marc Valin */
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/**
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@file ltp.h
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@brief Long-Term Prediction functions
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*/
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/*
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions
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are met:
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- Redistributions of source code must retain the above copyright
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notice, this list of conditions and the following disclaimer.
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- Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in the
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documentation and/or other materials provided with the distribution.
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- Neither the name of the Xiph.org Foundation nor the names of its
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contributors may be used to endorse or promote products derived from
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this software without specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR
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CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <speex/speex_bits.h>
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#include "arch.h"
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/** LTP parameters. */
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typedef struct {
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const signed char *gain_cdbk;
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int gain_bits;
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int pitch_bits;
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} ltp_params;
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#ifdef FIXED_POINT
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#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)))
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#else
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#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]))
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#endif
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spx_word32_t inner_prod(const spx_word16_t *x, const spx_word16_t *y, int len);
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void pitch_xcorr(const spx_word16_t *_x, const spx_word16_t *_y, spx_word32_t *corr, int len, int nb_pitch, char *stack);
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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);
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/** Finds the best quantized 3-tap pitch predictor by analysis by synthesis */
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int pitch_search_3tap(
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spx_word16_t target[], /* Target vector */
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spx_word16_t *sw,
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spx_coef_t ak[], /* LPCs for this subframe */
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spx_coef_t awk1[], /* Weighted LPCs #1 for this subframe */
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spx_coef_t awk2[], /* Weighted LPCs #2 for this subframe */
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spx_sig_t exc[], /* Overlapping codebook */
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const void *par,
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int start, /* Smallest pitch value allowed */
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int end, /* Largest pitch value allowed */
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spx_word16_t pitch_coef, /* Voicing (pitch) coefficient */
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int p, /* Number of LPC coeffs */
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int nsf, /* Number of samples in subframe */
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SpeexBits *bits,
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char *stack,
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spx_word16_t *exc2,
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spx_word16_t *r,
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int complexity,
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int cdbk_offset,
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int plc_tuning,
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spx_word32_t *cumul_gain
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);
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/*Unquantize adaptive codebook and update pitch contribution*/
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void pitch_unquant_3tap(
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spx_word16_t exc[], /* Input excitation */
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spx_word32_t exc_out[], /* Output excitation */
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int start, /* Smallest pitch value allowed */
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int end, /* Largest pitch value allowed */
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spx_word16_t pitch_coef, /* Voicing (pitch) coefficient */
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const void *par,
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int nsf, /* Number of samples in subframe */
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int *pitch_val,
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spx_word16_t *gain_val,
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SpeexBits *bits,
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char *stack,
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int lost,
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int subframe_offset,
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spx_word16_t last_pitch_gain,
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int cdbk_offset
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);
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/** Forced pitch delay and gain */
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int forced_pitch_quant(
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spx_word16_t target[], /* Target vector */
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spx_word16_t *sw,
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spx_coef_t ak[], /* LPCs for this subframe */
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spx_coef_t awk1[], /* Weighted LPCs #1 for this subframe */
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spx_coef_t awk2[], /* Weighted LPCs #2 for this subframe */
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spx_sig_t exc[], /* Excitation */
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const void *par,
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int start, /* Smallest pitch value allowed */
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int end, /* Largest pitch value allowed */
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spx_word16_t pitch_coef, /* Voicing (pitch) coefficient */
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int p, /* Number of LPC coeffs */
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int nsf, /* Number of samples in subframe */
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SpeexBits *bits,
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char *stack,
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spx_word16_t *exc2,
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spx_word16_t *r,
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int complexity,
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int cdbk_offset,
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int plc_tuning,
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spx_word32_t *cumul_gain
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);
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/** Unquantize forced pitch delay and gain */
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void forced_pitch_unquant(
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spx_word16_t exc[], /* Input excitation */
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spx_word32_t exc_out[], /* Output excitation */
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int start, /* Smallest pitch value allowed */
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int end, /* Largest pitch value allowed */
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spx_word16_t pitch_coef, /* Voicing (pitch) coefficient */
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const void *par,
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int nsf, /* Number of samples in subframe */
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int *pitch_val,
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spx_word16_t *gain_val,
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SpeexBits *bits,
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char *stack,
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int lost,
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int subframe_offset,
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spx_word16_t last_pitch_gain,
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int cdbk_offset
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);
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