diff options
Diffstat (limited to 'lib/rbcodec/codecs/libspeex/kiss_fft.h')
-rw-r--r-- | lib/rbcodec/codecs/libspeex/kiss_fft.h | 108 |
1 files changed, 108 insertions, 0 deletions
diff --git a/lib/rbcodec/codecs/libspeex/kiss_fft.h b/lib/rbcodec/codecs/libspeex/kiss_fft.h new file mode 100644 index 0000000000..43319b1ba8 --- /dev/null +++ b/lib/rbcodec/codecs/libspeex/kiss_fft.h | |||
@@ -0,0 +1,108 @@ | |||
1 | #ifndef KISS_FFT_H | ||
2 | #define KISS_FFT_H | ||
3 | |||
4 | #include <stdlib.h> | ||
5 | #include <math.h> | ||
6 | #include "arch.h" | ||
7 | |||
8 | #ifdef __cplusplus | ||
9 | extern "C" { | ||
10 | #endif | ||
11 | |||
12 | /* | ||
13 | ATTENTION! | ||
14 | If you would like a : | ||
15 | -- a utility that will handle the caching of fft objects | ||
16 | -- real-only (no imaginary time component ) FFT | ||
17 | -- a multi-dimensional FFT | ||
18 | -- a command-line utility to perform ffts | ||
19 | -- a command-line utility to perform fast-convolution filtering | ||
20 | |||
21 | Then see kfc.h kiss_fftr.h kiss_fftnd.h fftutil.c kiss_fastfir.c | ||
22 | in the tools/ directory. | ||
23 | */ | ||
24 | |||
25 | #ifdef USE_SIMD | ||
26 | # include <xmmintrin.h> | ||
27 | # define kiss_fft_scalar __m128 | ||
28 | #define KISS_FFT_MALLOC(nbytes) memalign(16,nbytes) | ||
29 | #else | ||
30 | #define KISS_FFT_MALLOC speex_alloc | ||
31 | #endif | ||
32 | |||
33 | |||
34 | #ifdef FIXED_POINT | ||
35 | #include "arch.h" | ||
36 | # define kiss_fft_scalar spx_int16_t | ||
37 | #else | ||
38 | # ifndef kiss_fft_scalar | ||
39 | /* default is float */ | ||
40 | # define kiss_fft_scalar float | ||
41 | # endif | ||
42 | #endif | ||
43 | |||
44 | typedef struct { | ||
45 | kiss_fft_scalar r; | ||
46 | kiss_fft_scalar i; | ||
47 | }kiss_fft_cpx; | ||
48 | |||
49 | typedef struct kiss_fft_state* kiss_fft_cfg; | ||
50 | |||
51 | /* | ||
52 | * kiss_fft_alloc | ||
53 | * | ||
54 | * Initialize a FFT (or IFFT) algorithm's cfg/state buffer. | ||
55 | * | ||
56 | * typical usage: kiss_fft_cfg mycfg=kiss_fft_alloc(1024,0,NULL,NULL); | ||
57 | * | ||
58 | * The return value from fft_alloc is a cfg buffer used internally | ||
59 | * by the fft routine or NULL. | ||
60 | * | ||
61 | * If lenmem is NULL, then kiss_fft_alloc will allocate a cfg buffer using malloc. | ||
62 | * The returned value should be free()d when done to avoid memory leaks. | ||
63 | * | ||
64 | * The state can be placed in a user supplied buffer 'mem': | ||
65 | * If lenmem is not NULL and mem is not NULL and *lenmem is large enough, | ||
66 | * then the function places the cfg in mem and the size used in *lenmem | ||
67 | * and returns mem. | ||
68 | * | ||
69 | * If lenmem is not NULL and ( mem is NULL or *lenmem is not large enough), | ||
70 | * then the function returns NULL and places the minimum cfg | ||
71 | * buffer size in *lenmem. | ||
72 | * */ | ||
73 | |||
74 | kiss_fft_cfg kiss_fft_alloc(int nfft,int inverse_fft,void * mem,size_t * lenmem); | ||
75 | |||
76 | /* | ||
77 | * kiss_fft(cfg,in_out_buf) | ||
78 | * | ||
79 | * Perform an FFT on a complex input buffer. | ||
80 | * for a forward FFT, | ||
81 | * fin should be f[0] , f[1] , ... ,f[nfft-1] | ||
82 | * fout will be F[0] , F[1] , ... ,F[nfft-1] | ||
83 | * Note that each element is complex and can be accessed like | ||
84 | f[k].r and f[k].i | ||
85 | * */ | ||
86 | void kiss_fft(kiss_fft_cfg cfg,const kiss_fft_cpx *fin,kiss_fft_cpx *fout); | ||
87 | |||
88 | /* | ||
89 | A more generic version of the above function. It reads its input from every Nth sample. | ||
90 | * */ | ||
91 | void kiss_fft_stride(kiss_fft_cfg cfg,const kiss_fft_cpx *fin,kiss_fft_cpx *fout,int fin_stride); | ||
92 | |||
93 | /* If kiss_fft_alloc allocated a buffer, it is one contiguous | ||
94 | buffer and can be simply free()d when no longer needed*/ | ||
95 | #define kiss_fft_free speex_free | ||
96 | |||
97 | /* | ||
98 | Cleans up some memory that gets managed internally. Not necessary to call, but it might clean up | ||
99 | your compiler output to call this before you exit. | ||
100 | */ | ||
101 | void kiss_fft_cleanup(void); | ||
102 | |||
103 | |||
104 | #ifdef __cplusplus | ||
105 | } | ||
106 | #endif | ||
107 | |||
108 | #endif | ||