Libav
|
00001 /* 00002 * Copyright (c) 2000, 2001, 2002 Fabrice Bellard 00003 * Copyright (c) 2002-2004 Michael Niedermayer <michaelni@gmx.at> 00004 * 00005 * This file is part of FFmpeg. 00006 * 00007 * FFmpeg is free software; you can redistribute it and/or 00008 * modify it under the terms of the GNU Lesser General Public 00009 * License as published by the Free Software Foundation; either 00010 * version 2.1 of the License, or (at your option) any later version. 00011 * 00012 * FFmpeg is distributed in the hope that it will be useful, 00013 * but WITHOUT ANY WARRANTY; without even the implied warranty of 00014 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 00015 * Lesser General Public License for more details. 00016 * 00017 * You should have received a copy of the GNU Lesser General Public 00018 * License along with FFmpeg; if not, write to the Free Software 00019 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 00020 */ 00021 00022 #ifndef AVCODEC_FFT_H 00023 #define AVCODEC_FFT_H 00024 00025 #include <stdint.h> 00026 #include "config.h" 00027 #include "libavutil/mem.h" 00028 #include "avfft.h" 00029 00030 /* FFT computation */ 00031 00032 struct FFTContext { 00033 int nbits; 00034 int inverse; 00035 uint16_t *revtab; 00036 FFTComplex *exptab; 00037 FFTComplex *exptab1; /* only used by SSE code */ 00038 FFTComplex *tmp_buf; 00039 int mdct_size; /* size of MDCT (i.e. number of input data * 2) */ 00040 int mdct_bits; /* n = 2^nbits */ 00041 /* pre/post rotation tables */ 00042 FFTSample *tcos; 00043 FFTSample *tsin; 00044 void (*fft_permute)(struct FFTContext *s, FFTComplex *z); 00045 void (*fft_calc)(struct FFTContext *s, FFTComplex *z); 00046 void (*imdct_calc)(struct FFTContext *s, FFTSample *output, const FFTSample *input); 00047 void (*imdct_half)(struct FFTContext *s, FFTSample *output, const FFTSample *input); 00048 void (*mdct_calc)(struct FFTContext *s, FFTSample *output, const FFTSample *input); 00049 int split_radix; 00050 int permutation; 00051 #define FF_MDCT_PERM_NONE 0 00052 #define FF_MDCT_PERM_INTERLEAVE 1 00053 }; 00054 00055 #if CONFIG_HARDCODED_TABLES 00056 #define COSTABLE_CONST const 00057 #define SINTABLE_CONST const 00058 #define SINETABLE_CONST const 00059 #else 00060 #define COSTABLE_CONST 00061 #define SINTABLE_CONST 00062 #define SINETABLE_CONST 00063 #endif 00064 00065 #define COSTABLE(size) \ 00066 COSTABLE_CONST DECLARE_ALIGNED(16, FFTSample, ff_cos_##size)[size/2] 00067 #define SINTABLE(size) \ 00068 SINTABLE_CONST DECLARE_ALIGNED(16, FFTSample, ff_sin_##size)[size/2] 00069 #define SINETABLE(size) \ 00070 SINETABLE_CONST DECLARE_ALIGNED(16, float, ff_sine_##size)[size] 00071 extern COSTABLE(16); 00072 extern COSTABLE(32); 00073 extern COSTABLE(64); 00074 extern COSTABLE(128); 00075 extern COSTABLE(256); 00076 extern COSTABLE(512); 00077 extern COSTABLE(1024); 00078 extern COSTABLE(2048); 00079 extern COSTABLE(4096); 00080 extern COSTABLE(8192); 00081 extern COSTABLE(16384); 00082 extern COSTABLE(32768); 00083 extern COSTABLE(65536); 00084 extern COSTABLE_CONST FFTSample* const ff_cos_tabs[17]; 00085 00090 void ff_init_ff_cos_tabs(int index); 00091 00092 extern SINTABLE(16); 00093 extern SINTABLE(32); 00094 extern SINTABLE(64); 00095 extern SINTABLE(128); 00096 extern SINTABLE(256); 00097 extern SINTABLE(512); 00098 extern SINTABLE(1024); 00099 extern SINTABLE(2048); 00100 extern SINTABLE(4096); 00101 extern SINTABLE(8192); 00102 extern SINTABLE(16384); 00103 extern SINTABLE(32768); 00104 extern SINTABLE(65536); 00105 00111 int ff_fft_init(FFTContext *s, int nbits, int inverse); 00112 void ff_fft_permute_c(FFTContext *s, FFTComplex *z); 00113 void ff_fft_calc_c(FFTContext *s, FFTComplex *z); 00114 00115 void ff_fft_init_altivec(FFTContext *s); 00116 void ff_fft_init_mmx(FFTContext *s); 00117 void ff_fft_init_arm(FFTContext *s); 00118 00122 static inline void ff_fft_permute(FFTContext *s, FFTComplex *z) 00123 { 00124 s->fft_permute(s, z); 00125 } 00130 static inline void ff_fft_calc(FFTContext *s, FFTComplex *z) 00131 { 00132 s->fft_calc(s, z); 00133 } 00134 void ff_fft_end(FFTContext *s); 00135 00136 /* MDCT computation */ 00137 00138 static inline void ff_imdct_calc(FFTContext *s, FFTSample *output, const FFTSample *input) 00139 { 00140 s->imdct_calc(s, output, input); 00141 } 00142 static inline void ff_imdct_half(FFTContext *s, FFTSample *output, const FFTSample *input) 00143 { 00144 s->imdct_half(s, output, input); 00145 } 00146 00147 static inline void ff_mdct_calc(FFTContext *s, FFTSample *output, 00148 const FFTSample *input) 00149 { 00150 s->mdct_calc(s, output, input); 00151 } 00152 00159 void ff_kbd_window_init(float *window, float alpha, int n); 00160 00166 void ff_sine_window_init(float *window, int n); 00167 00171 void ff_init_ff_sine_windows(int index); 00172 extern SINETABLE( 32); 00173 extern SINETABLE( 64); 00174 extern SINETABLE( 128); 00175 extern SINETABLE( 256); 00176 extern SINETABLE( 512); 00177 extern SINETABLE(1024); 00178 extern SINETABLE(2048); 00179 extern SINETABLE(4096); 00180 extern SINETABLE_CONST float * const ff_sine_windows[13]; 00181 00182 int ff_mdct_init(FFTContext *s, int nbits, int inverse, double scale); 00183 void ff_imdct_calc_c(FFTContext *s, FFTSample *output, const FFTSample *input); 00184 void ff_imdct_half_c(FFTContext *s, FFTSample *output, const FFTSample *input); 00185 void ff_mdct_calc_c(FFTContext *s, FFTSample *output, const FFTSample *input); 00186 void ff_mdct_end(FFTContext *s); 00187 00188 /* Real Discrete Fourier Transform */ 00189 00190 struct RDFTContext { 00191 int nbits; 00192 int inverse; 00193 int sign_convention; 00194 00195 /* pre/post rotation tables */ 00196 const FFTSample *tcos; 00197 SINTABLE_CONST FFTSample *tsin; 00198 FFTContext fft; 00199 void (*rdft_calc)(struct RDFTContext *s, FFTSample *z); 00200 }; 00201 00207 int ff_rdft_init(RDFTContext *s, int nbits, enum RDFTransformType trans); 00208 void ff_rdft_end(RDFTContext *s); 00209 00210 void ff_rdft_init_arm(RDFTContext *s); 00211 00212 static av_always_inline void ff_rdft_calc(RDFTContext *s, FFTSample *data) 00213 { 00214 s->rdft_calc(s, data); 00215 } 00216 00217 /* Discrete Cosine Transform */ 00218 00219 struct DCTContext { 00220 int nbits; 00221 int inverse; 00222 RDFTContext rdft; 00223 const float *costab; 00224 FFTSample *csc2; 00225 void (*dct_calc)(struct DCTContext *s, FFTSample *data); 00226 }; 00227 00236 int ff_dct_init(DCTContext *s, int nbits, enum DCTTransformType type); 00237 void ff_dct_calc(DCTContext *s, FFTSample *data); 00238 void ff_dct_end (DCTContext *s); 00239 00240 #endif /* AVCODEC_FFT_H */