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author | Sean Bartell <wingedtachikoma@gmail.com> | 2011-06-25 21:32:25 -0400 |
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committer | Nils Wallménius <nils@rockbox.org> | 2012-04-25 22:13:20 +0200 |
commit | f40bfc9267b13b54e6379dfe7539447662879d24 (patch) | |
tree | 9b20069d5e62809ff434061ad730096836f916f2 /lib/rbcodec/codecs/libwmavoice/celp_math.h | |
parent | a0009907de7a0107d49040d8a180f140e2eff299 (diff) | |
download | rockbox-f40bfc9267b13b54e6379dfe7539447662879d24.tar.gz rockbox-f40bfc9267b13b54e6379dfe7539447662879d24.zip |
Add codecs to librbcodec.
Change-Id: Id7f4717d51ed02d67cb9f9cb3c0ada4a81843f97
Reviewed-on: http://gerrit.rockbox.org/137
Reviewed-by: Nils Wallménius <nils@rockbox.org>
Tested-by: Nils Wallménius <nils@rockbox.org>
Diffstat (limited to 'lib/rbcodec/codecs/libwmavoice/celp_math.h')
-rw-r--r-- | lib/rbcodec/codecs/libwmavoice/celp_math.h | 76 |
1 files changed, 76 insertions, 0 deletions
diff --git a/lib/rbcodec/codecs/libwmavoice/celp_math.h b/lib/rbcodec/codecs/libwmavoice/celp_math.h new file mode 100644 index 0000000000..4cf656fb7e --- /dev/null +++ b/lib/rbcodec/codecs/libwmavoice/celp_math.h | |||
@@ -0,0 +1,76 @@ | |||
1 | /* | ||
2 | * Various fixed-point math operations | ||
3 | * | ||
4 | * Copyright (c) 2008 Vladimir Voroshilov | ||
5 | * | ||
6 | * This file is part of FFmpeg. | ||
7 | * | ||
8 | * FFmpeg is free software; you can redistribute it and/or | ||
9 | * modify it under the terms of the GNU Lesser General Public | ||
10 | * License as published by the Free Software Foundation; either | ||
11 | * version 2.1 of the License, or (at your option) any later version. | ||
12 | * | ||
13 | * FFmpeg is distributed in the hope that it will be useful, | ||
14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | ||
16 | * Lesser General Public License for more details. | ||
17 | * | ||
18 | * You should have received a copy of the GNU Lesser General Public | ||
19 | * License along with FFmpeg; if not, write to the Free Software | ||
20 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | ||
21 | */ | ||
22 | |||
23 | #ifndef AVCODEC_CELP_MATH_H | ||
24 | #define AVCODEC_CELP_MATH_H | ||
25 | |||
26 | #include <stdint.h> | ||
27 | |||
28 | /** | ||
29 | * fixed-point implementation of cosine in [0; PI) domain. | ||
30 | * @param arg fixed-point cosine argument, 0 <= arg < 0x4000 | ||
31 | * | ||
32 | * @return value of (1<<15) * cos(arg * PI / (1<<14)), -0x8000 <= result <= 0x7fff | ||
33 | */ | ||
34 | int16_t ff_cos(uint16_t arg); | ||
35 | |||
36 | /** | ||
37 | * fixed-point implementation of exp2(x) in [0; 1] domain. | ||
38 | * @param power argument to exp2, 0 <= power <= 0x7fff | ||
39 | * | ||
40 | * @return value of (1<<20) * exp2(power / (1<<15)) | ||
41 | * 0x8000c <= result <= 0xfffea | ||
42 | */ | ||
43 | int ff_exp2(uint16_t power); | ||
44 | |||
45 | /** | ||
46 | * Calculate log2(x). | ||
47 | * @param value function argument, 0 < value <= 7fff ffff | ||
48 | * | ||
49 | * @return value of (1<<15) * log2(value) | ||
50 | */ | ||
51 | int ff_log2(uint32_t value); | ||
52 | |||
53 | /** | ||
54 | * Shift value left or right depending on sign of offset parameter. | ||
55 | * @param value value to shift | ||
56 | * @param offset shift offset | ||
57 | * | ||
58 | * @return value << offset, if offset>=0; value >> -offset - otherwise | ||
59 | */ | ||
60 | static inline int bidir_sal(int value, int offset) | ||
61 | { | ||
62 | if(offset < 0) return value >> -offset; | ||
63 | else return value << offset; | ||
64 | } | ||
65 | |||
66 | /** | ||
67 | * returns the dot product. | ||
68 | * @param a input data array | ||
69 | * @param b input data array | ||
70 | * @param length number of elements | ||
71 | * | ||
72 | * @return dot product = sum of elementwise products | ||
73 | */ | ||
74 | float ff_dot_productf(const float* a, const float* b, int length); | ||
75 | |||
76 | #endif /* AVCODEC_CELP_MATH_H */ | ||