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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/* FFT computation */
31
32struct FFTContext {
33 int nbits;
34 int inverse;
35 uint16_t *revtab;
36 FFTComplex *tmp_buf;
37 int mdct_size; /* size of MDCT (i.e. number of input data * 2) */
38 int mdct_bits; /* n = 2^nbits */
39 /* pre/post rotation tables */
40 FFTSample *tcos;
41 FFTSample *tsin;
42 void (*fft_permute)(struct FFTContext *s, FFTComplex *z);
43 void (*fft_calc)(struct FFTContext *s, FFTComplex *z);
44 void (*imdct_calc)(struct FFTContext *s, FFTSample *output, const FFTSample *input);
45 void (*imdct_half)(struct FFTContext *s, FFTSample *output, const FFTSample *input);
46 void (*mdct_calc)(struct FFTContext *s, FFTSample *output, const FFTSample *input);
47 int permutation;
48#define FF_MDCT_PERM_NONE 0
49#define FF_MDCT_PERM_INTERLEAVE 1
50};
51
52#if CONFIG_HARDCODED_TABLES
53#define COSTABLE_CONST const
54#define SINTABLE_CONST const
55#define SINETABLE_CONST const
56#else
57#define COSTABLE_CONST
58#define SINTABLE_CONST
59#define SINETABLE_CONST
60#endif
61
62#define COSTABLE(size) \
63 COSTABLE_CONST DECLARE_ALIGNED(16, FFTSample, ff_cos_##size)[size/2]
64#define SINTABLE(size) \
65 SINTABLE_CONST DECLARE_ALIGNED(16, FFTSample, ff_sin_##size)[size/2]
66#define SINETABLE(size) \
67 SINETABLE_CONST DECLARE_ALIGNED(16, float, ff_sine_##size)[size]
68extern COSTABLE(16);
69extern COSTABLE(32);
70extern COSTABLE(64);
71extern COSTABLE(128);
72extern COSTABLE(256);
73extern COSTABLE(512);
74extern COSTABLE(1024);
75extern COSTABLE(2048);
76extern COSTABLE(4096);
77extern COSTABLE(8192);
78extern COSTABLE(16384);
79extern COSTABLE(32768);
80extern COSTABLE(65536);
81extern COSTABLE_CONST FFTSample* const ff_cos_tabs[17];
82
83/**
84 * Initialize the cosine table in ff_cos_tabs[index]
85 * \param index index in ff_cos_tabs array of the table to initialize
86 */
87void ff_init_ff_cos_tabs(int index);
88
89extern SINTABLE(16);
90extern SINTABLE(32);
91extern SINTABLE(64);
92extern SINTABLE(128);
93extern SINTABLE(256);
94extern SINTABLE(512);
95extern SINTABLE(1024);
96extern SINTABLE(2048);
97extern SINTABLE(4096);
98extern SINTABLE(8192);
99extern SINTABLE(16384);
100extern SINTABLE(32768);
101extern SINTABLE(65536);
102
103/**
104 * Set up a complex FFT.
105 * @param nbits log2 of the length of the input array
106 * @param inverse if 0 perform the forward transform, if 1 perform the inverse
107 */
108int ff_fft_init(FFTContext *s, int nbits, int inverse);
109void ff_fft_permute_c(FFTContext *s, FFTComplex *z);
110void ff_fft_calc_c(FFTContext *s, FFTComplex *z);
111
112void ff_fft_init_altivec(FFTContext *s);
113void ff_fft_init_mmx(FFTContext *s);
114void ff_fft_init_arm(FFTContext *s);
115void ff_dct_init_mmx(DCTContext *s);
116
117/**
118 * Do the permutation needed BEFORE calling ff_fft_calc().
119 */
120static inline void ff_fft_permute(FFTContext *s, FFTComplex *z)
121{
122 s->fft_permute(s, z);
123}
124/**
125 * Do a complex FFT with the parameters defined in ff_fft_init(). The
126 * input data must be permuted before. No 1.0/sqrt(n) normalization is done.
127 */
128static inline void ff_fft_calc(FFTContext *s, FFTComplex *z)
129{
130 s->fft_calc(s, z);
131}
132void ff_fft_end(FFTContext *s);
133
134/* MDCT computation */
135
136static inline void ff_imdct_calc(FFTContext *s, FFTSample *output, const FFTSample *input)
137{
138 s->imdct_calc(s, output, input);
139}
140static inline void ff_imdct_half(FFTContext *s, FFTSample *output, const FFTSample *input)
141{
142 s->imdct_half(s, output, input);
143}
144
145static inline void ff_mdct_calc(FFTContext *s, FFTSample *output,
146 const FFTSample *input)
147{
148 s->mdct_calc(s, output, input);
149}
150
151/**
152 * Maximum window size for ff_kbd_window_init.
153 */
154#define FF_KBD_WINDOW_MAX 1024
155
156/**
157 * Generate a Kaiser-Bessel Derived Window.
158 * @param window pointer to half window
159 * @param alpha determines window shape
160 * @param n size of half window, max FF_KBD_WINDOW_MAX
161 */
162void ff_kbd_window_init(float *window, float alpha, int n);
163
164/**
165 * Generate a sine window.
166 * @param window pointer to half window
167 * @param n size of half window
168 */
169void ff_sine_window_init(float *window, int n);
170
171/**
172 * initialize the specified entry of ff_sine_windows
173 */
174void ff_init_ff_sine_windows(int index);
175extern SINETABLE( 32);
176extern SINETABLE( 64);
177extern SINETABLE( 128);
178extern SINETABLE( 256);
179extern SINETABLE( 512);
180extern SINETABLE(1024);
181extern SINETABLE(2048);
182extern SINETABLE(4096);
183extern SINETABLE_CONST float * const ff_sine_windows[13];
184
185int ff_mdct_init(FFTContext *s, int nbits, int inverse, double scale);
186void ff_imdct_calc_c(FFTContext *s, FFTSample *output, const FFTSample *input);
187void ff_imdct_half_c(FFTContext *s, FFTSample *output, const FFTSample *input);
188void ff_mdct_calc_c(FFTContext *s, FFTSample *output, const FFTSample *input);
189void ff_mdct_end(FFTContext *s);
190
191/* Real Discrete Fourier Transform */
192
193struct RDFTContext {
194 int nbits;
195 int inverse;
196 int sign_convention;
197
198 /* pre/post rotation tables */
199 const FFTSample *tcos;
200 SINTABLE_CONST FFTSample *tsin;
201 FFTContext fft;
202 void (*rdft_calc)(struct RDFTContext *s, FFTSample *z);
203};
204
205/**
206 * Set up a real FFT.
207 * @param nbits log2 of the length of the input array
208 * @param trans the type of transform
209 */
210int ff_rdft_init(RDFTContext *s, int nbits, enum RDFTransformType trans);
211void ff_rdft_end(RDFTContext *s);
212
213void ff_rdft_init_arm(RDFTContext *s);
214
215static av_always_inline void ff_rdft_calc(RDFTContext *s, FFTSample *data)
216{
217 s->rdft_calc(s, data);
218}
219
220/* Discrete Cosine Transform */
221
222struct DCTContext {
223 int nbits;
224 int inverse;
225 RDFTContext rdft;
226 const float *costab;
227 FFTSample *csc2;
228 void (*dct_calc)(struct DCTContext *s, FFTSample *data);
229 void (*dct32)(FFTSample *out, const FFTSample *in);
230};
231
232/**
233 * Set 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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