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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) = 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 | } |