media/libopus/celt/kiss_fft.h@6474c204b198 (annotated)
media/libopus/celt/kiss_fft.h
Wed, 31 Dec 2014 06:09:35 +0100
- author
- Michael Schloh von Bennewitz <michael@schloh.com>
- date
- Wed, 31 Dec 2014 06:09:35 +0100
- changeset 0
- 6474c204b198
- permissions
- -rw-r--r--
Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.
| michael@0 | 1 | /*Copyright (c) 2003-2004, Mark Borgerding |
| michael@0 | 2 | Lots of modifications by Jean-Marc Valin |
| michael@0 | 3 | Copyright (c) 2005-2007, Xiph.Org Foundation |
| michael@0 | 4 | Copyright (c) 2008, Xiph.Org Foundation, CSIRO |
| michael@0 | 5 | |
| michael@0 | 6 | All rights reserved. |
| michael@0 | 7 | |
| michael@0 | 8 | Redistribution and use in source and binary forms, with or without |
| michael@0 | 9 | modification, are permitted provided that the following conditions are met: |
| michael@0 | 10 | |
| michael@0 | 11 | * Redistributions of source code must retain the above copyright notice, |
| michael@0 | 12 | this list of conditions and the following disclaimer. |
| michael@0 | 13 | * Redistributions in binary form must reproduce the above copyright notice, |
| michael@0 | 14 | this list of conditions and the following disclaimer in the |
| michael@0 | 15 | documentation and/or other materials provided with the distribution. |
| michael@0 | 16 | |
| michael@0 | 17 | THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" |
| michael@0 | 18 | AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| michael@0 | 19 | IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| michael@0 | 20 | ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE |
| michael@0 | 21 | LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
| michael@0 | 22 | CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
| michael@0 | 23 | SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
| michael@0 | 24 | INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
| michael@0 | 25 | CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
| michael@0 | 26 | ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
| michael@0 | 27 | POSSIBILITY OF SUCH DAMAGE.*/ |
| michael@0 | 28 | |
| michael@0 | 29 | #ifndef KISS_FFT_H |
| michael@0 | 30 | #define KISS_FFT_H |
| michael@0 | 31 | |
| michael@0 | 32 | #include <stdlib.h> |
| michael@0 | 33 | #include <math.h> |
| michael@0 | 34 | #include "arch.h" |
| michael@0 | 35 | |
| michael@0 | 36 | #ifdef __cplusplus |
| michael@0 | 37 | extern "C" { |
| michael@0 | 38 | #endif |
| michael@0 | 39 | |
| michael@0 | 40 | #ifdef USE_SIMD |
| michael@0 | 41 | # include <xmmintrin.h> |
| michael@0 | 42 | # define kiss_fft_scalar __m128 |
| michael@0 | 43 | #define KISS_FFT_MALLOC(nbytes) memalign(16,nbytes) |
| michael@0 | 44 | #else |
| michael@0 | 45 | #define KISS_FFT_MALLOC opus_alloc |
| michael@0 | 46 | #endif |
| michael@0 | 47 | |
| michael@0 | 48 | #ifdef FIXED_POINT |
| michael@0 | 49 | #include "arch.h" |
| michael@0 | 50 | |
| michael@0 | 51 | # define kiss_fft_scalar opus_int32 |
| michael@0 | 52 | # define kiss_twiddle_scalar opus_int16 |
| michael@0 | 53 | |
| michael@0 | 54 | |
| michael@0 | 55 | #else |
| michael@0 | 56 | # ifndef kiss_fft_scalar |
| michael@0 | 57 | /* default is float */ |
| michael@0 | 58 | # define kiss_fft_scalar float |
| michael@0 | 59 | # define kiss_twiddle_scalar float |
| michael@0 | 60 | # define KF_SUFFIX _celt_single |
| michael@0 | 61 | # endif |
| michael@0 | 62 | #endif |
| michael@0 | 63 | |
| michael@0 | 64 | typedef struct { |
| michael@0 | 65 | kiss_fft_scalar r; |
| michael@0 | 66 | kiss_fft_scalar i; |
| michael@0 | 67 | }kiss_fft_cpx; |
| michael@0 | 68 | |
| michael@0 | 69 | typedef struct { |
| michael@0 | 70 | kiss_twiddle_scalar r; |
| michael@0 | 71 | kiss_twiddle_scalar i; |
| michael@0 | 72 | }kiss_twiddle_cpx; |
| michael@0 | 73 | |
| michael@0 | 74 | #define MAXFACTORS 8 |
| michael@0 | 75 | /* e.g. an fft of length 128 has 4 factors |
| michael@0 | 76 | as far as kissfft is concerned |
| michael@0 | 77 | 4*4*4*2 |
| michael@0 | 78 | */ |
| michael@0 | 79 | |
| michael@0 | 80 | typedef struct kiss_fft_state{ |
| michael@0 | 81 | int nfft; |
| michael@0 | 82 | #ifndef FIXED_POINT |
| michael@0 | 83 | kiss_fft_scalar scale; |
| michael@0 | 84 | #endif |
| michael@0 | 85 | int shift; |
| michael@0 | 86 | opus_int16 factors[2*MAXFACTORS]; |
| michael@0 | 87 | const opus_int16 *bitrev; |
| michael@0 | 88 | const kiss_twiddle_cpx *twiddles; |
| michael@0 | 89 | } kiss_fft_state; |
| michael@0 | 90 | |
| michael@0 | 91 | /*typedef struct kiss_fft_state* kiss_fft_cfg;*/ |
| michael@0 | 92 | |
| michael@0 | 93 | /** |
| michael@0 | 94 | * opus_fft_alloc |
| michael@0 | 95 | * |
| michael@0 | 96 | * Initialize a FFT (or IFFT) algorithm's cfg/state buffer. |
| michael@0 | 97 | * |
| michael@0 | 98 | * typical usage: kiss_fft_cfg mycfg=opus_fft_alloc(1024,0,NULL,NULL); |
| michael@0 | 99 | * |
| michael@0 | 100 | * The return value from fft_alloc is a cfg buffer used internally |
| michael@0 | 101 | * by the fft routine or NULL. |
| michael@0 | 102 | * |
| michael@0 | 103 | * If lenmem is NULL, then opus_fft_alloc will allocate a cfg buffer using malloc. |
| michael@0 | 104 | * The returned value should be free()d when done to avoid memory leaks. |
| michael@0 | 105 | * |
| michael@0 | 106 | * The state can be placed in a user supplied buffer 'mem': |
| michael@0 | 107 | * If lenmem is not NULL and mem is not NULL and *lenmem is large enough, |
| michael@0 | 108 | * then the function places the cfg in mem and the size used in *lenmem |
| michael@0 | 109 | * and returns mem. |
| michael@0 | 110 | * |
| michael@0 | 111 | * If lenmem is not NULL and ( mem is NULL or *lenmem is not large enough), |
| michael@0 | 112 | * then the function returns NULL and places the minimum cfg |
| michael@0 | 113 | * buffer size in *lenmem. |
| michael@0 | 114 | * */ |
| michael@0 | 115 | |
| michael@0 | 116 | kiss_fft_state *opus_fft_alloc_twiddles(int nfft,void * mem,size_t * lenmem, const kiss_fft_state *base); |
| michael@0 | 117 | |
| michael@0 | 118 | kiss_fft_state *opus_fft_alloc(int nfft,void * mem,size_t * lenmem); |
| michael@0 | 119 | |
| michael@0 | 120 | /** |
| michael@0 | 121 | * opus_fft(cfg,in_out_buf) |
| michael@0 | 122 | * |
| michael@0 | 123 | * Perform an FFT on a complex input buffer. |
| michael@0 | 124 | * for a forward FFT, |
| michael@0 | 125 | * fin should be f[0] , f[1] , ... ,f[nfft-1] |
| michael@0 | 126 | * fout will be F[0] , F[1] , ... ,F[nfft-1] |
| michael@0 | 127 | * Note that each element is complex and can be accessed like |
| michael@0 | 128 | f[k].r and f[k].i |
| michael@0 | 129 | * */ |
| michael@0 | 130 | void opus_fft(const kiss_fft_state *cfg,const kiss_fft_cpx *fin,kiss_fft_cpx *fout); |
| michael@0 | 131 | void opus_ifft(const kiss_fft_state *cfg,const kiss_fft_cpx *fin,kiss_fft_cpx *fout); |
| michael@0 | 132 | |
| michael@0 | 133 | void opus_fft_free(const kiss_fft_state *cfg); |
| michael@0 | 134 | |
| michael@0 | 135 | #ifdef __cplusplus |
| michael@0 | 136 | } |
| michael@0 | 137 | #endif |
| michael@0 | 138 | |
| michael@0 | 139 | #endif |
