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1/*
2 * Copyright (c) 2000, 2001, 2002 Fabrice Bellard
3 * Copyright (c) 2002-2004 Michael Niedermayer <michaelni@gmx.at>
4 *
5 * This file is part of FFmpeg.
6 *
7 * FFmpeg is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
11 *
12 * FFmpeg is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
16 *
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with FFmpeg; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20 */
21
22#ifndef AVCODEC_FFT_H
23#define AVCODEC_FFT_H
24
25#include <stdint.h>
26//#include "config.h"
27#include "libavutil/mem.h"
28#include "avfft.h"
29
30/* DECLARE_ALIGNED - Taken from libavutil/internal.h */
31#define DECLARE_ALIGNED(n,t,v) t __attribute__ ((aligned (n))) v
32#define DECLARE_ALIGNED_16(t,v) DECLARE_ALIGNED(16,t,v)
33
34/* FFT computation */
35
36struct FFTContext {
37 int nbits;
38 int inverse;
39 uint16_t *revtab;
40 FFTComplex *exptab;
41 FFTComplex *exptab1; /* only used by SSE code */
42 FFTComplex *tmp_buf;
43 int mdct_size; /* size of MDCT (i.e. number of input data * 2) */
44 int mdct_bits; /* n = 2^nbits */
45 /* pre/post rotation tables */
46 FFTSample *tcos;
47 FFTSample *tsin;
48 void (*fft_permute)(struct FFTContext *s, FFTComplex *z);
49 void (*fft_calc)(struct FFTContext *s, FFTComplex *z);
50 void (*imdct_calc)(struct FFTContext *s, FFTSample *output, const FFTSample *input);
51 void (*imdct_half)(struct FFTContext *s, FFTSample *output, const FFTSample *input);
52 void (*mdct_calc)(struct FFTContext *s, FFTSample *output, const FFTSample *input);
53 int split_radix;
54 int permutation;
55#define FF_MDCT_PERM_NONE 0
56#define FF_MDCT_PERM_INTERLEAVE 1
57};
58
59#if CONFIG_HARDCODED_TABLES
60#define COSTABLE_CONST const
61#define SINTABLE_CONST const
62#define SINETABLE_CONST const
63#else
64#define COSTABLE_CONST
65#define SINTABLE_CONST
66#define SINETABLE_CONST
67#endif
68
69#define COSTABLE(size) \
70 COSTABLE_CONST DECLARE_ALIGNED(16, FFTSample, ff_cos_##size)[size/2]
71#define SINTABLE(size) \
72 SINTABLE_CONST DECLARE_ALIGNED(16, FFTSample, ff_sin_##size)[size/2]
73#define SINETABLE(size) \
74 SINETABLE_CONST DECLARE_ALIGNED(16, float, ff_sine_##size)[size]
75extern COSTABLE(16);
76extern COSTABLE(32);
77extern COSTABLE(64);
78extern COSTABLE(128);
79extern COSTABLE(256);
80extern COSTABLE(512);
81extern COSTABLE(1024);
82extern COSTABLE(2048);
83extern COSTABLE(4096);
84extern COSTABLE(8192);
85extern COSTABLE(16384);
86extern COSTABLE(32768);
87extern COSTABLE(65536);
88//extern COSTABLE_CONST FFTSample* const ff_cos_tabs[17];
89
90/**
91 * Initializes the cosine table in ff_cos_tabs[index]
92 * \param index index in ff_cos_tabs array of the table to initialize
93 */
94void ff_init_ff_cos_tabs(int index);
95
96extern SINTABLE(16);
97extern SINTABLE(32);
98extern SINTABLE(64);
99extern SINTABLE(128);
100extern SINTABLE(256);
101extern SINTABLE(512);
102extern SINTABLE(1024);
103extern SINTABLE(2048);
104extern SINTABLE(4096);
105extern SINTABLE(8192);
106extern SINTABLE(16384);
107extern SINTABLE(32768);
108extern SINTABLE(65536);
109
110/**
111 * Sets up a complex FFT.
112 * @param nbits log2 of the length of the input array
113 * @param inverse if 0 perform the forward transform, if 1 perform the inverse
114 */
115int ff_fft_init(FFTContext *s, int nbits, int inverse);
116void ff_fft_permute_c(FFTContext *s, FFTComplex *z);
117void ff_fft_calc_c(FFTContext *s, FFTComplex *z);
118
119void ff_fft_init_altivec(FFTContext *s);
120void ff_fft_init_mmx(FFTContext *s);
121void ff_fft_init_arm(FFTContext *s);
122
123/**
124 * Do the permutation needed BEFORE calling ff_fft_calc().
125 */
126static inline void ff_fft_permute(FFTContext *s, FFTComplex *z)
127{
128 s->fft_permute(s, z);
129}
130/**
131 * Do a complex FFT with the parameters defined in ff_fft_init(). The
132 * input data must be permuted before. No 1.0/sqrt(n) normalization is done.
133 */
134static inline void ff_fft_calc(FFTContext *s, FFTComplex *z)
135{
136 s->fft_calc(s, z);
137}
138void ff_fft_end(FFTContext *s);
139
140/* MDCT computation */
141
142static inline void ff_imdct_calc(FFTContext *s, FFTSample *output, const FFTSample *input)
143{
144 s->imdct_calc(s, output, input);
145}
146static inline void ff_imdct_half(FFTContext *s, FFTSample *output, const FFTSample *input)
147{
148 s->imdct_half(s, output, input);
149}
150
151static inline void ff_mdct_calc(FFTContext *s, FFTSample *output,
152 const FFTSample *input)
153{
154 s->mdct_calc(s, output, input);
155}
156
157/**
158 * Generate a Kaiser-Bessel Derived Window.
159 * @param window pointer to half window
160 * @param alpha determines window shape
161 * @param n size of half window
162 */
163void ff_kbd_window_init(float *window, float alpha, int n);
164
165/**
166 * Generate a sine window.
167 * @param window pointer to half window
168 * @param n size of half window
169 */
170void ff_sine_window_init(float *window, int n);
171
172/**
173 * initialize the specified entry of ff_sine_windows
174 */
175void ff_init_ff_sine_windows(int index);
176extern SINETABLE( 32);
177extern SINETABLE( 64);
178extern SINETABLE( 128);
179extern SINETABLE( 256);
180extern SINETABLE( 512);
181extern SINETABLE(1024);
182extern SINETABLE(2048);
183extern SINETABLE(4096);
184extern SINETABLE_CONST float * const ff_sine_windows[13];
185
186int ff_mdct_init(FFTContext *s, int nbits, int inverse, double scale);
187void ff_imdct_calc_c(FFTContext *s, FFTSample *output, const FFTSample *input);
188void ff_imdct_half_c(FFTContext *s, FFTSample *output, const FFTSample *input);
189void ff_mdct_calc_c(FFTContext *s, FFTSample *output, const FFTSample *input);
190void ff_mdct_end(FFTContext *s);
191
192/* Real Discrete Fourier Transform */
193
194struct RDFTContext {
195 int nbits;
196 int inverse;
197 int sign_convention;
198
199 /* pre/post rotation tables */
200 const FFTSample *tcos;
201 SINTABLE_CONST FFTSample *tsin;
202 FFTContext fft;
203 void (*rdft_calc)(struct RDFTContext *s, FFTSample *z);
204};
205
206/**
207 * Sets up a real FFT.
208 * @param nbits log2 of the length of the input array
209 * @param trans the type of transform
210 */
211int ff_rdft_init(RDFTContext *s, int nbits, enum RDFTransformType trans);
212void ff_rdft_end(RDFTContext *s);
213
214void ff_rdft_init_arm(RDFTContext *s);
215
216static av_always_inline void ff_rdft_calc(RDFTContext *s, FFTSample *data)
217{
218 s->rdft_calc(s, data);
219}
220
221/* Discrete Cosine Transform */
222
223struct DCTContext {
224 int nbits;
225 int inverse;
226 RDFTContext rdft;
227 const float *costab;
228 FFTSample *csc2;
229 void (*dct_calc)(struct DCTContext *s, FFTSample *data);
230};
231
232/**
233 * Sets up DCT.
234 * @param nbits size of the input array:
235 * (1 << nbits) for DCT-II, DCT-III and DST-I
236 * (1 << nbits) + 1 for DCT-I
237 *
238 * @note the first element of the input of DST-I is ignored
239 */
240int ff_dct_init(DCTContext *s, int nbits, enum DCTTransformType type);
241void ff_dct_calc(DCTContext *s, FFTSample *data);
242void ff_dct_end (DCTContext *s);
243
244#endif /* AVCODEC_FFT_H */
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