blob: 776c78da7195d0bf0013b95c2db63596ef401c27
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 | |
51 | static 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) = (int)((unsigned)in[i][j] << shift); |
60 | } |
61 | |
62 | static 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 | |
76 | static 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 | |
90 | static 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 |