flacdec: split off channel decorrelation as flacdsp
[libav.git] / libavcodec / flacdsp_template.c
CommitLineData
4a852834
MR
1/*
2 * Copyright (c) 2012 Mans Rullgard <mans@mansr.com>
3 *
4 * This file is part of Libav.
5 *
6 * Libav is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
10 *
11 * Libav is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
15 *
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with Libav; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19 */
20
21#include <stdint.h>
22
23#undef FUNC
24#undef sample
25
26#if SAMPLE_SIZE == 32
27# define FUNC(n) n ## _32
28# define sample int32_t
29#else
30# define FUNC(n) n ## _16
31# define sample int16_t
32#endif
33
34static void FUNC(flac_decorrelate_indep_c)(uint8_t **out, int32_t **in,
35 int channels, int len, int shift)
36{
37 sample *samples = (sample *) out[0];
38 int i, j;
39
40 for (j = 0; j < len; j++)
41 for (i = 0; i < channels; i++)
42 *samples++ = in[i][j] << shift;
43}
44
45static void FUNC(flac_decorrelate_ls_c)(uint8_t **out, int32_t **in,
46 int channels, int len, int shift)
47{
48 sample *samples = (sample *) out[0];
49 int i;
50
51 for (i = 0; i < len; i++) {
52 int a = in[0][i];
53 int b = in[1][i];
54 *samples++ = a << shift;
55 *samples++ = (a - b) << shift;
56 }
57}
58
59static void FUNC(flac_decorrelate_rs_c)(uint8_t **out, int32_t **in,
60 int channels, int len, int shift)
61{
62 sample *samples = (sample *) out[0];
63 int i;
64
65 for (i = 0; i < len; i++) {
66 int a = in[0][i];
67 int b = in[1][i];
68 *samples++ = (a + b) << shift;
69 *samples++ = b << shift;
70 }
71}
72
73static void FUNC(flac_decorrelate_ms_c)(uint8_t **out, int32_t **in,
74 int channels, int len, int shift)
75{
76 sample *samples = (sample *) out[0];
77 int i;
78
79 for (i = 0; i < len; i++) {
80 int a = in[0][i];
81 int b = in[1][i];
82 a -= b >> 1;
83 *samples++ = (a + b) << shift;
84 *samples++ = a << shift;
85 }
86}