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author | Dave Chapman <dave@dchapman.com> | 2005-02-16 19:33:19 +0000 |
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committer | Dave Chapman <dave@dchapman.com> | 2005-02-16 19:33:19 +0000 |
commit | aa97e4d4981d61808a558c5ab36be6d3bcc2c4f6 (patch) | |
tree | a66b2fcd87f37b26e2d4f360e6c2a9db53eb1b5b /apps/codecs/libFLAC/include/private/float.h | |
parent | 9b32a1988f848145d96ba2be8cba86e837196df3 (diff) | |
download | rockbox-aa97e4d4981d61808a558c5ab36be6d3bcc2c4f6.tar.gz rockbox-aa97e4d4981d61808a558c5ab36be6d3bcc2c4f6.zip |
Initial import of libFLAC from flac-1.1.2.tar.gz
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@5983 a1c6a512-1295-4272-9138-f99709370657
Diffstat (limited to 'apps/codecs/libFLAC/include/private/float.h')
-rw-r--r-- | apps/codecs/libFLAC/include/private/float.h | 97 |
1 files changed, 97 insertions, 0 deletions
diff --git a/apps/codecs/libFLAC/include/private/float.h b/apps/codecs/libFLAC/include/private/float.h new file mode 100644 index 0000000000..67a5f266e8 --- /dev/null +++ b/apps/codecs/libFLAC/include/private/float.h | |||
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1 | /* libFLAC - Free Lossless Audio Codec library | ||
2 | * Copyright (C) 2004,2005 Josh Coalson | ||
3 | * | ||
4 | * Redistribution and use in source and binary forms, with or without | ||
5 | * modification, are permitted provided that the following conditions | ||
6 | * are met: | ||
7 | * | ||
8 | * - Redistributions of source code must retain the above copyright | ||
9 | * notice, this list of conditions and the following disclaimer. | ||
10 | * | ||
11 | * - Redistributions in binary form must reproduce the above copyright | ||
12 | * notice, this list of conditions and the following disclaimer in the | ||
13 | * documentation and/or other materials provided with the distribution. | ||
14 | * | ||
15 | * - Neither the name of the Xiph.org Foundation nor the names of its | ||
16 | * contributors may be used to endorse or promote products derived from | ||
17 | * this software without specific prior written permission. | ||
18 | * | ||
19 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS | ||
20 | * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT | ||
21 | * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR | ||
22 | * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR | ||
23 | * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, | ||
24 | * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, | ||
25 | * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR | ||
26 | * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF | ||
27 | * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING | ||
28 | * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS | ||
29 | * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | ||
30 | */ | ||
31 | |||
32 | #ifndef FLAC__PRIVATE__FLOAT_H | ||
33 | #define FLAC__PRIVATE__FLOAT_H | ||
34 | |||
35 | #ifdef HAVE_CONFIG_H | ||
36 | #include <config.h> | ||
37 | #endif | ||
38 | |||
39 | #include "FLAC/ordinals.h" | ||
40 | |||
41 | /* | ||
42 | * These typedefs make it easier to ensure that integer versions of | ||
43 | * the library really only contain integer operations. All the code | ||
44 | * in libFLAC should use FLAC__float and FLAC__double in place of | ||
45 | * float and double, and be protected by checks of the macro | ||
46 | * FLAC__INTEGER_ONLY_LIBRARY. | ||
47 | * | ||
48 | * FLAC__real is the basic floating point type used in LPC analysis. | ||
49 | */ | ||
50 | #ifndef FLAC__INTEGER_ONLY_LIBRARY | ||
51 | typedef double FLAC__double; | ||
52 | typedef float FLAC__float; | ||
53 | /* | ||
54 | * WATCHOUT: changing FLAC__real will change the signatures of many | ||
55 | * functions that have assembly language equivalents and break them. | ||
56 | */ | ||
57 | typedef float FLAC__real; | ||
58 | #else | ||
59 | /* | ||
60 | * The convention for FLAC__fixedpoint is to use the upper 16 bits | ||
61 | * for the integer part and lower 16 bits for the fractional part. | ||
62 | */ | ||
63 | typedef FLAC__int32 FLAC__fixedpoint; | ||
64 | extern const FLAC__fixedpoint FLAC__FP_ZERO; | ||
65 | extern const FLAC__fixedpoint FLAC__FP_ONE_HALF; | ||
66 | extern const FLAC__fixedpoint FLAC__FP_ONE; | ||
67 | extern const FLAC__fixedpoint FLAC__FP_LN2; | ||
68 | extern const FLAC__fixedpoint FLAC__FP_E; | ||
69 | |||
70 | #define FLAC__fixedpoint_trunc(x) ((x)>>16) | ||
71 | |||
72 | #define FLAC__fixedpoint_mul(x, y) ( (FLAC__fixedpoint) ( ((FLAC__int64)(x)*(FLAC__int64)(y)) >> 16 ) ) | ||
73 | |||
74 | #define FLAC__fixedpoint_div(x, y) ( (FLAC__fixedpoint) ( ( ((FLAC__int64)(x)<<32) / (FLAC__int64)(y) ) >> 16 ) ) | ||
75 | |||
76 | /* | ||
77 | * FLAC__fixedpoint_log2() | ||
78 | * -------------------------------------------------------------------- | ||
79 | * Returns the base-2 logarithm of the fixed-point number 'x' using an | ||
80 | * algorithm by Knuth for x >= 1.0 | ||
81 | * | ||
82 | * 'fracbits' is the number of fractional bits of 'x'. 'fracbits' must | ||
83 | * be < 32 and evenly divisible by 4 (0 is OK but not very precise). | ||
84 | * | ||
85 | * 'precision' roughly limits the number of iterations that are done; | ||
86 | * use (unsigned)(-1) for maximum precision. | ||
87 | * | ||
88 | * If 'x' is less than one -- that is, x < (1<<fracbits) -- then this | ||
89 | * function will punt and return 0. | ||
90 | * | ||
91 | * The return value will also have 'fracbits' fractional bits. | ||
92 | */ | ||
93 | FLAC__uint32 FLAC__fixedpoint_log2(FLAC__uint32 x, unsigned fracbits, unsigned precision); | ||
94 | |||
95 | #endif | ||
96 | |||
97 | #endif | ||