1/*
2 * Copyright (c) 2012 Mans Rullgard <mans@mansr.com>
3 *
4 * This file is part of FFmpeg.
5 *
6 * FFmpeg 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 * FFmpeg 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 FFmpeg; 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#include "libavutil/avutil.h"
23
24#undef FUNC
25#undef FSUF
26#undef sample
27#undef sample_type
28#undef OUT
29#undef S
30
31#if SAMPLE_SIZE == 32
32#   define sample_type  int32_t
33#else
34#   define sample_type  int16_t
35#endif
36
37#if PLANAR
38#   define FSUF   AV_JOIN(SAMPLE_SIZE, p)
39#   define sample sample_type *
40#   define OUT(n) n
41#   define S(s, c, i) (s[c][i])
42#else
43#   define FSUF   SAMPLE_SIZE
44#   define sample sample_type
45#   define OUT(n) n[0]
46#   define S(s, c, i) (*s++)
47#endif
48
49#define FUNC(n) AV_JOIN(n ## _, FSUF)
50
51static void FUNC(flac_decorrelate_indep_c)(uint8_t **out, int32_t **in,
52                                           int channels, int len, int shift)
53{
54    sample *samples = (sample *) OUT(out);
55    int i, j;
56
57    for (j = 0; j < len; j++)
58        for (i = 0; i < channels; i++)
59            S(samples, i, j) = in[i][j] << shift;
60}
61
62static void FUNC(flac_decorrelate_ls_c)(uint8_t **out, int32_t **in,
63                                        int channels, int len, int shift)
64{
65    sample *samples = (sample *) OUT(out);
66    int i;
67
68    for (i = 0; i < len; i++) {
69        int a = in[0][i];
70        int b = in[1][i];
71        S(samples, 0, i) =  a      << shift;
72        S(samples, 1, i) = (a - b) << shift;
73    }
74}
75
76static void FUNC(flac_decorrelate_rs_c)(uint8_t **out, int32_t **in,
77                                        int channels, int len, int shift)
78{
79    sample *samples = (sample *) OUT(out);
80    int i;
81
82    for (i = 0; i < len; i++) {
83        int a = in[0][i];
84        int b = in[1][i];
85        S(samples, 0, i) = (a + b) << shift;
86        S(samples, 1, i) =  b      << shift;
87    }
88}
89
90static void FUNC(flac_decorrelate_ms_c)(uint8_t **out, int32_t **in,
91                                        int channels, int len, int shift)
92{
93    sample *samples = (sample *) OUT(out);
94    int i;
95
96    for (i = 0; i < len; i++) {
97        int a = in[0][i];
98        int b = in[1][i];
99        a -= b >> 1;
100        S(samples, 0, i) = (a + b) << shift;
101        S(samples, 1, i) =  a      << shift;
102    }
103}
104