|
|
|
|
/**
|
|
|
|
|
* LPC utility code
|
|
|
|
|
* Copyright (c) 2006 Justin Ruggles <justin.ruggles@gmail.com>
|
|
|
|
|
*
|
|
|
|
|
* This file is part of FFmpeg.
|
|
|
|
|
*
|
|
|
|
|
* FFmpeg is free software; you can redistribute it and/or
|
|
|
|
|
* modify it under the terms of the GNU Lesser General Public
|
|
|
|
|
* License as published by the Free Software Foundation; either
|
|
|
|
|
* version 2.1 of the License, or (at your option) any later version.
|
|
|
|
|
*
|
|
|
|
|
* FFmpeg is distributed in the hope that it will be useful,
|
|
|
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
|
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
|
|
|
* Lesser General Public License for more details.
|
|
|
|
|
*
|
|
|
|
|
* You should have received a copy of the GNU Lesser General Public
|
|
|
|
|
* License along with FFmpeg; if not, write to the Free Software
|
|
|
|
|
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
|
|
|
|
|
*/
|
|
|
|
|
|
|
|
|
|
#ifndef FFMPEG_LPC_H
|
|
|
|
|
#define FFMPEG_LPC_H
|
|
|
|
|
|
|
|
|
|
#include <stdint.h>
|
|
|
|
|
#include "dsputil.h"
|
|
|
|
|
|
|
|
|
|
#define ORDER_METHOD_EST 0
|
|
|
|
|
#define ORDER_METHOD_2LEVEL 1
|
|
|
|
|
#define ORDER_METHOD_4LEVEL 2
|
|
|
|
|
#define ORDER_METHOD_8LEVEL 3
|
|
|
|
|
#define ORDER_METHOD_SEARCH 4
|
|
|
|
|
#define ORDER_METHOD_LOG 5
|
|
|
|
|
|
|
|
|
|
#define MIN_LPC_ORDER 1
|
|
|
|
|
#define MAX_LPC_ORDER 32
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
/**
|
|
|
|
|
* Calculate LPC coefficients for multiple orders
|
|
|
|
|
*/
|
|
|
|
|
int ff_lpc_calc_coefs(DSPContext *s,
|
|
|
|
|
const int32_t *samples, int blocksize, int min_order,
|
|
|
|
|
int max_order, int precision,
|
|
|
|
|
int32_t coefs[][MAX_LPC_ORDER], int *shift, int use_lpc,
|
|
|
|
|
int omethod, int max_shift, int zero_shift);
|
|
|
|
|
|
|
|
|
|
#endif /* FFMPEG_LPC_H */
|
