libavcodec/lpc.h

   1 /**
   2  * LPC utility code
   3  * Copyright (c) 2006  Justin Ruggles <jruggle@earthlink.net>
   4  *
   5  * This file is part of FFmpeg.
   6  *
   7  * FFmpeg is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU Lesser General Public
   9  * License as published by the Free Software Foundation; either
  10  * version 2.1 of the License, or (at your option) any later version.
  11  *
  12  * FFmpeg is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * Lesser General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU Lesser General Public
  18  * License along with FFmpeg; if not, write to the Free Software
  19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  20  */
  21
  22 #ifndef FFMPEG_LPC_H
  23 #define FFMPEG_LPC_H
  24
  25 #include <inttypes.h>
  26
  27 #define ORDER_METHOD_EST     0
  28 #define ORDER_METHOD_2LEVEL  1
  29 #define ORDER_METHOD_4LEVEL  2
  30 #define ORDER_METHOD_8LEVEL  3
  31 #define ORDER_METHOD_SEARCH  4
  32 #define ORDER_METHOD_LOG     5
  33
  34 #define MIN_LPC_ORDER        1
  35 #define MAX_LPC_ORDER       32
  36
  37
  38 /**
  39  * Calculate LPC coefficients for multiple orders
  40  */
  41 int ff_lpc_calc_coefs(DSPContext *s,
  42                       const int32_t *samples, int blocksize, int min_order,
  43                       int max_order, int precision,
  44                       int32_t coefs[][MAX_LPC_ORDER], int *shift, int use_lpc,
  45                       int omethod, int max_shift, int zero_shift);
  46
  47 #endif /* FFMPEG_LPC_H */