mirror of https://github.com/FFmpeg/FFmpeg.git
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
166 lines
4.4 KiB
166 lines
4.4 KiB
/* |
|
* Copyright (c) 2000, 2001, 2002 Fabrice Bellard |
|
* Copyright (c) 2002-2004 Michael Niedermayer <michaelni@gmx.at> |
|
* |
|
* This file is part of FFmpeg. |
|
* |
|
* FFmpeg is free software; you can redistribute it and/or |
|
* modify it under the terms of the GNU Lesser General Public |
|
* License as published by the Free Software Foundation; either |
|
* version 2.1 of the License, or (at your option) any later version. |
|
* |
|
* FFmpeg is distributed in the hope that it will be useful, |
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of |
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
|
* Lesser General Public License for more details. |
|
* |
|
* You should have received a copy of the GNU Lesser General Public |
|
* License along with FFmpeg; if not, write to the Free Software |
|
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
|
*/ |
|
|
|
#ifndef AVCODEC_FFT_H |
|
#define AVCODEC_FFT_H |
|
|
|
#ifndef CONFIG_FFT_FLOAT |
|
#define CONFIG_FFT_FLOAT 1 |
|
#endif |
|
|
|
#ifndef CONFIG_FFT_FIXED_32 |
|
#define CONFIG_FFT_FIXED_32 0 |
|
#endif |
|
|
|
#include <stdint.h> |
|
#include "config.h" |
|
#include "libavutil/mem.h" |
|
|
|
#if CONFIG_FFT_FLOAT |
|
|
|
#include "avfft.h" |
|
|
|
#define FFT_NAME(x) x |
|
|
|
typedef float FFTDouble; |
|
|
|
#else |
|
|
|
#if CONFIG_FFT_FIXED_32 |
|
|
|
#define Q31(x) (int)((x)*2147483648.0 + 0.5) |
|
#define FFT_NAME(x) x ## _fixed_32 |
|
|
|
typedef int32_t FFTSample; |
|
|
|
#else /* CONFIG_FFT_FIXED_32 */ |
|
|
|
#define FFT_NAME(x) x ## _fixed |
|
|
|
typedef int16_t FFTSample; |
|
|
|
#endif /* CONFIG_FFT_FIXED_32 */ |
|
|
|
typedef struct FFTComplex { |
|
FFTSample re, im; |
|
} FFTComplex; |
|
|
|
typedef int FFTDouble; |
|
typedef struct FFTContext FFTContext; |
|
|
|
#endif /* CONFIG_FFT_FLOAT */ |
|
|
|
typedef struct FFTDComplex { |
|
FFTDouble re, im; |
|
} FFTDComplex; |
|
|
|
/* FFT computation */ |
|
|
|
struct FFTContext { |
|
int nbits; |
|
int inverse; |
|
uint16_t *revtab; |
|
FFTComplex *tmp_buf; |
|
int mdct_size; /* size of MDCT (i.e. number of input data * 2) */ |
|
int mdct_bits; /* n = 2^nbits */ |
|
/* pre/post rotation tables */ |
|
FFTSample *tcos; |
|
FFTSample *tsin; |
|
/** |
|
* Do the permutation needed BEFORE calling fft_calc(). |
|
*/ |
|
void (*fft_permute)(struct FFTContext *s, FFTComplex *z); |
|
/** |
|
* Do a complex FFT with the parameters defined in ff_fft_init(). The |
|
* input data must be permuted before. No 1.0/sqrt(n) normalization is done. |
|
*/ |
|
void (*fft_calc)(struct FFTContext *s, FFTComplex *z); |
|
void (*imdct_calc)(struct FFTContext *s, FFTSample *output, const FFTSample *input); |
|
void (*imdct_half)(struct FFTContext *s, FFTSample *output, const FFTSample *input); |
|
void (*mdct_calc)(struct FFTContext *s, FFTSample *output, const FFTSample *input); |
|
void (*mdct_calcw)(struct FFTContext *s, FFTDouble *output, const FFTSample *input); |
|
int fft_permutation; |
|
#define FF_FFT_PERM_DEFAULT 0 |
|
#define FF_FFT_PERM_SWAP_LSBS 1 |
|
#define FF_FFT_PERM_AVX 2 |
|
int mdct_permutation; |
|
#define FF_MDCT_PERM_NONE 0 |
|
#define FF_MDCT_PERM_INTERLEAVE 1 |
|
}; |
|
|
|
#if CONFIG_HARDCODED_TABLES |
|
#define COSTABLE_CONST const |
|
#else |
|
#define COSTABLE_CONST |
|
#endif |
|
|
|
#define COSTABLE(size) \ |
|
COSTABLE_CONST DECLARE_ALIGNED(32, FFTSample, FFT_NAME(ff_cos_##size))[size/2] |
|
|
|
extern COSTABLE(16); |
|
extern COSTABLE(32); |
|
extern COSTABLE(64); |
|
extern COSTABLE(128); |
|
extern COSTABLE(256); |
|
extern COSTABLE(512); |
|
extern COSTABLE(1024); |
|
extern COSTABLE(2048); |
|
extern COSTABLE(4096); |
|
extern COSTABLE(8192); |
|
extern COSTABLE(16384); |
|
extern COSTABLE(32768); |
|
extern COSTABLE(65536); |
|
extern COSTABLE_CONST FFTSample* const FFT_NAME(ff_cos_tabs)[17]; |
|
|
|
#define ff_init_ff_cos_tabs FFT_NAME(ff_init_ff_cos_tabs) |
|
|
|
/** |
|
* Initialize the cosine table in ff_cos_tabs[index] |
|
* @param index index in ff_cos_tabs array of the table to initialize |
|
*/ |
|
void ff_init_ff_cos_tabs(int index); |
|
|
|
#define ff_fft_init FFT_NAME(ff_fft_init) |
|
#define ff_fft_end FFT_NAME(ff_fft_end) |
|
|
|
/** |
|
* Set up a complex FFT. |
|
* @param nbits log2 of the length of the input array |
|
* @param inverse if 0 perform the forward transform, if 1 perform the inverse |
|
*/ |
|
int ff_fft_init(FFTContext *s, int nbits, int inverse); |
|
|
|
void ff_fft_init_x86(FFTContext *s); |
|
void ff_fft_init_arm(FFTContext *s); |
|
void ff_fft_init_mips(FFTContext *s); |
|
void ff_fft_init_ppc(FFTContext *s); |
|
|
|
void ff_fft_fixed_init_arm(FFTContext *s); |
|
|
|
void ff_fft_end(FFTContext *s); |
|
|
|
#define ff_mdct_init FFT_NAME(ff_mdct_init) |
|
#define ff_mdct_end FFT_NAME(ff_mdct_end) |
|
|
|
int ff_mdct_init(FFTContext *s, int nbits, int inverse, double scale); |
|
void ff_mdct_end(FFTContext *s); |
|
|
|
#endif /* AVCODEC_FFT_H */
|
|
|