6586854e6726b75bb84aee79533a7f8cb88fb6b2
[libav.git] / libavcodec / lpc.h
1 /**
2 * LPC utility code
3 * Copyright (c) 2006 Justin Ruggles <justin.ruggles@gmail.com>
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 <stdint.h>
26 #include "dsputil.h"
27
28 #define ORDER_METHOD_EST 0
29 #define ORDER_METHOD_2LEVEL 1
30 #define ORDER_METHOD_4LEVEL 2
31 #define ORDER_METHOD_8LEVEL 3
32 #define ORDER_METHOD_SEARCH 4
33 #define ORDER_METHOD_LOG 5
34
35 #define MIN_LPC_ORDER 1
36 #define MAX_LPC_ORDER 32
37
38
39 /**
40 * Calculate LPC coefficients for multiple orders
41 */
42 int ff_lpc_calc_coefs(DSPContext *s,
43 const int32_t *samples, int blocksize, int min_order,
44 int max_order, int precision,
45 int32_t coefs[][MAX_LPC_ORDER], int *shift, int use_lpc,
46 int omethod, int max_shift, int zero_shift);
47
48 #endif /* FFMPEG_LPC_H */