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139 lines
5.2 KiB
139 lines
5.2 KiB
14 years ago
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/* Copyright (C) 2002 Jean-Marc Valin
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File: ltp.h
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Long-Term Prediction functions
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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_bits.h"
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typedef struct ltp_params {
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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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void open_loop_nbest_pitch(float *sw, int start, int end, int len, int *pitch, float *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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float target[], /* Target vector */
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float *sw,
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float ak[], /* LPCs for this subframe */
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float awk1[], /* Weighted LPCs #1 for this subframe */
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float awk2[], /* Weighted LPCs #2 for this subframe */
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float exc[], /* Overlapping codebook */
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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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float 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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float *exc2,
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float *r,
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int complexity
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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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float exc[], /* 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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float pitch_coef, /* Voicing (pitch) coefficient */
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void *par,
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int nsf, /* Number of samples in subframe */
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int *pitch_val,
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float *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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float last_pitch_gain
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);
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float pitch_gain_search_3tap(
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float target[], /* Target vector */
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float ak[], /* LPCs for this subframe */
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float awk1[], /* Weighted LPCs #1 for this subframe */
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float awk2[], /* Weighted LPCs #2 for this subframe */
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float exc[], /* Excitation */
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void *par,
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int pitch, /* Pitch value */
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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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float *exc2,
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float *r,
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int *cdbk_index
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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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float target[], /* Target vector */
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float *sw,
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float ak[], /* LPCs for this subframe */
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float awk1[], /* Weighted LPCs #1 for this subframe */
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float awk2[], /* Weighted LPCs #2 for this subframe */
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float exc[], /* Excitation */
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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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float 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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float *exc2,
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float *r,
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int complexity
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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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float exc[], /* 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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float pitch_coef, /* Voicing (pitch) coefficient */
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void *par,
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int nsf, /* Number of samples in subframe */
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int *pitch_val,
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float *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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float last_pitch_gain
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);
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