yading@10: /*
yading@10:  * Copyright (c) 2000, 2001, 2002 Fabrice Bellard
yading@10:  * Copyright (c) 2002-2004 Michael Niedermayer <michaelni@gmx.at>
yading@10:  *
yading@10:  * This file is part of FFmpeg.
yading@10:  *
yading@10:  * FFmpeg is free software; you can redistribute it and/or
yading@10:  * modify it under the terms of the GNU Lesser General Public
yading@10:  * License as published by the Free Software Foundation; either
yading@10:  * version 2.1 of the License, or (at your option) any later version.
yading@10:  *
yading@10:  * FFmpeg is distributed in the hope that it will be useful,
yading@10:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
yading@10:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
yading@10:  * Lesser General Public License for more details.
yading@10:  *
yading@10:  * You should have received a copy of the GNU Lesser General Public
yading@10:  * License along with FFmpeg; if not, write to the Free Software
yading@10:  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
yading@10:  */
yading@10: 
yading@10: #ifndef AVCODEC_FFT_H
yading@10: #define AVCODEC_FFT_H
yading@10: 
yading@10: #ifndef CONFIG_FFT_FLOAT
yading@10: #define CONFIG_FFT_FLOAT 1
yading@10: #endif
yading@10: 
yading@10: #include <stdint.h>
yading@10: #include "config.h"
yading@10: #include "libavutil/mem.h"
yading@10: 
yading@10: #if CONFIG_FFT_FLOAT
yading@10: 
yading@10: #include "avfft.h"
yading@10: 
yading@10: #define FFT_NAME(x) x
yading@10: 
yading@10: typedef float FFTDouble;
yading@10: 
yading@10: #else
yading@10: 
yading@10: #define FFT_NAME(x) x ## _fixed
yading@10: 
yading@10: typedef int16_t FFTSample;
yading@10: typedef int     FFTDouble;
yading@10: 
yading@10: typedef struct FFTComplex {
yading@10:     int16_t re, im;
yading@10: } FFTComplex;
yading@10: 
yading@10: typedef struct FFTContext FFTContext;
yading@10: 
yading@10: #endif /* CONFIG_FFT_FLOAT */
yading@10: 
yading@10: typedef struct FFTDComplex {
yading@10:     FFTDouble re, im;
yading@10: } FFTDComplex;
yading@10: 
yading@10: /* FFT computation */
yading@10: 
yading@10: struct FFTContext {
yading@10:     int nbits;
yading@10:     int inverse;
yading@10:     uint16_t *revtab;
yading@10:     FFTComplex *tmp_buf;
yading@10:     int mdct_size; /* size of MDCT (i.e. number of input data * 2) */
yading@10:     int mdct_bits; /* n = 2^nbits */
yading@10:     /* pre/post rotation tables */
yading@10:     FFTSample *tcos;
yading@10:     FFTSample *tsin;
yading@10:     /**
yading@10:      * Do the permutation needed BEFORE calling fft_calc().
yading@10:      */
yading@10:     void (*fft_permute)(struct FFTContext *s, FFTComplex *z);
yading@10:     /**
yading@10:      * Do a complex FFT with the parameters defined in ff_fft_init(). The
yading@10:      * input data must be permuted before. No 1.0/sqrt(n) normalization is done.
yading@10:      */
yading@10:     void (*fft_calc)(struct FFTContext *s, FFTComplex *z);
yading@10:     void (*imdct_calc)(struct FFTContext *s, FFTSample *output, const FFTSample *input);
yading@10:     void (*imdct_half)(struct FFTContext *s, FFTSample *output, const FFTSample *input);
yading@10:     void (*mdct_calc)(struct FFTContext *s, FFTSample *output, const FFTSample *input);
yading@10:     void (*mdct_calcw)(struct FFTContext *s, FFTDouble *output, const FFTSample *input);
yading@10:     int fft_permutation;
yading@10: #define FF_FFT_PERM_DEFAULT   0
yading@10: #define FF_FFT_PERM_SWAP_LSBS 1
yading@10: #define FF_FFT_PERM_AVX       2
yading@10:     int mdct_permutation;
yading@10: #define FF_MDCT_PERM_NONE       0
yading@10: #define FF_MDCT_PERM_INTERLEAVE 1
yading@10: };
yading@10: 
yading@10: #if CONFIG_HARDCODED_TABLES
yading@10: #define COSTABLE_CONST const
yading@10: #else
yading@10: #define COSTABLE_CONST
yading@10: #endif
yading@10: 
yading@10: #define COSTABLE(size) \
yading@10:     COSTABLE_CONST DECLARE_ALIGNED(32, FFTSample, FFT_NAME(ff_cos_##size))[size/2]
yading@10: 
yading@10: extern COSTABLE(16);
yading@10: extern COSTABLE(32);
yading@10: extern COSTABLE(64);
yading@10: extern COSTABLE(128);
yading@10: extern COSTABLE(256);
yading@10: extern COSTABLE(512);
yading@10: extern COSTABLE(1024);
yading@10: extern COSTABLE(2048);
yading@10: extern COSTABLE(4096);
yading@10: extern COSTABLE(8192);
yading@10: extern COSTABLE(16384);
yading@10: extern COSTABLE(32768);
yading@10: extern COSTABLE(65536);
yading@10: extern COSTABLE_CONST FFTSample* const FFT_NAME(ff_cos_tabs)[17];
yading@10: 
yading@10: #define ff_init_ff_cos_tabs FFT_NAME(ff_init_ff_cos_tabs)
yading@10: 
yading@10: /**
yading@10:  * Initialize the cosine table in ff_cos_tabs[index]
yading@10:  * @param index index in ff_cos_tabs array of the table to initialize
yading@10:  */
yading@10: void ff_init_ff_cos_tabs(int index);
yading@10: 
yading@10: #define ff_fft_init FFT_NAME(ff_fft_init)
yading@10: #define ff_fft_end  FFT_NAME(ff_fft_end)
yading@10: 
yading@10: /**
yading@10:  * Set up a complex FFT.
yading@10:  * @param nbits           log2 of the length of the input array
yading@10:  * @param inverse         if 0 perform the forward transform, if 1 perform the inverse
yading@10:  */
yading@10: int ff_fft_init(FFTContext *s, int nbits, int inverse);
yading@10: 
yading@10: #if CONFIG_FFT_FLOAT
yading@10: void ff_fft_init_altivec(FFTContext *s);
yading@10: void ff_fft_init_x86(FFTContext *s);
yading@10: void ff_fft_init_arm(FFTContext *s);
yading@10: void ff_fft_init_mips(FFTContext *s);
yading@10: #else
yading@10: void ff_fft_fixed_init_arm(FFTContext *s);
yading@10: #endif
yading@10: 
yading@10: void ff_fft_end(FFTContext *s);
yading@10: 
yading@10: #define ff_mdct_init FFT_NAME(ff_mdct_init)
yading@10: #define ff_mdct_end  FFT_NAME(ff_mdct_end)
yading@10: 
yading@10: int ff_mdct_init(FFTContext *s, int nbits, int inverse, double scale);
yading@10: void ff_mdct_end(FFTContext *s);
yading@10: 
yading@10: #endif /* AVCODEC_FFT_H */