mirror of
https://gitee.com/openharmony/third_party_ffmpeg
synced 2024-11-24 11:49:48 +00:00
246 lines
7.0 KiB
C
246 lines
7.0 KiB
C
/*
|
|
* 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
|
|
|
|
#include <stdint.h>
|
|
#include "config.h"
|
|
#include "libavutil/mem.h"
|
|
#include "avfft.h"
|
|
|
|
/* FFT computation */
|
|
|
|
struct FFTContext {
|
|
int nbits;
|
|
int inverse;
|
|
uint16_t *revtab;
|
|
FFTComplex *exptab;
|
|
FFTComplex *exptab1; /* only used by SSE code */
|
|
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;
|
|
void (*fft_permute)(struct FFTContext *s, FFTComplex *z);
|
|
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);
|
|
int split_radix;
|
|
int permutation;
|
|
#define FF_MDCT_PERM_NONE 0
|
|
#define FF_MDCT_PERM_INTERLEAVE 1
|
|
};
|
|
|
|
#if CONFIG_HARDCODED_TABLES
|
|
#define COSTABLE_CONST const
|
|
#define SINTABLE_CONST const
|
|
#define SINETABLE_CONST const
|
|
#else
|
|
#define COSTABLE_CONST
|
|
#define SINTABLE_CONST
|
|
#define SINETABLE_CONST
|
|
#endif
|
|
|
|
#define COSTABLE(size) \
|
|
COSTABLE_CONST DECLARE_ALIGNED(16, FFTSample, ff_cos_##size)[size/2]
|
|
#define SINTABLE(size) \
|
|
SINTABLE_CONST DECLARE_ALIGNED(16, FFTSample, ff_sin_##size)[size/2]
|
|
#define SINETABLE(size) \
|
|
SINETABLE_CONST DECLARE_ALIGNED(16, float, ff_sine_##size)[size]
|
|
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 ff_cos_tabs[17];
|
|
|
|
/**
|
|
* Initializes 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);
|
|
|
|
extern SINTABLE(16);
|
|
extern SINTABLE(32);
|
|
extern SINTABLE(64);
|
|
extern SINTABLE(128);
|
|
extern SINTABLE(256);
|
|
extern SINTABLE(512);
|
|
extern SINTABLE(1024);
|
|
extern SINTABLE(2048);
|
|
extern SINTABLE(4096);
|
|
extern SINTABLE(8192);
|
|
extern SINTABLE(16384);
|
|
extern SINTABLE(32768);
|
|
extern SINTABLE(65536);
|
|
|
|
/**
|
|
* Sets 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_permute_c(FFTContext *s, FFTComplex *z);
|
|
void ff_fft_calc_c(FFTContext *s, FFTComplex *z);
|
|
|
|
void ff_fft_init_altivec(FFTContext *s);
|
|
void ff_fft_init_mmx(FFTContext *s);
|
|
void ff_fft_init_arm(FFTContext *s);
|
|
|
|
/**
|
|
* Do the permutation needed BEFORE calling ff_fft_calc().
|
|
*/
|
|
static inline void ff_fft_permute(FFTContext *s, FFTComplex *z)
|
|
{
|
|
s->fft_permute(s, 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.
|
|
*/
|
|
static inline void ff_fft_calc(FFTContext *s, FFTComplex *z)
|
|
{
|
|
s->fft_calc(s, z);
|
|
}
|
|
void ff_fft_end(FFTContext *s);
|
|
|
|
/* MDCT computation */
|
|
|
|
static inline void ff_imdct_calc(FFTContext *s, FFTSample *output, const FFTSample *input)
|
|
{
|
|
s->imdct_calc(s, output, input);
|
|
}
|
|
static inline void ff_imdct_half(FFTContext *s, FFTSample *output, const FFTSample *input)
|
|
{
|
|
s->imdct_half(s, output, input);
|
|
}
|
|
|
|
static inline void ff_mdct_calc(FFTContext *s, FFTSample *output,
|
|
const FFTSample *input)
|
|
{
|
|
s->mdct_calc(s, output, input);
|
|
}
|
|
|
|
/**
|
|
* Maximum window size for ff_kbd_window_init.
|
|
*/
|
|
#define FF_KBD_WINDOW_MAX 1024
|
|
|
|
/**
|
|
* Generate a Kaiser-Bessel Derived Window.
|
|
* @param window pointer to half window
|
|
* @param alpha determines window shape
|
|
* @param n size of half window, max FF_KBD_WINDOW_MAX
|
|
*/
|
|
void ff_kbd_window_init(float *window, float alpha, int n);
|
|
|
|
/**
|
|
* Generate a sine window.
|
|
* @param window pointer to half window
|
|
* @param n size of half window
|
|
*/
|
|
void ff_sine_window_init(float *window, int n);
|
|
|
|
/**
|
|
* initialize the specified entry of ff_sine_windows
|
|
*/
|
|
void ff_init_ff_sine_windows(int index);
|
|
extern SINETABLE( 32);
|
|
extern SINETABLE( 64);
|
|
extern SINETABLE( 128);
|
|
extern SINETABLE( 256);
|
|
extern SINETABLE( 512);
|
|
extern SINETABLE(1024);
|
|
extern SINETABLE(2048);
|
|
extern SINETABLE(4096);
|
|
extern SINETABLE_CONST float * const ff_sine_windows[13];
|
|
|
|
int ff_mdct_init(FFTContext *s, int nbits, int inverse, double scale);
|
|
void ff_imdct_calc_c(FFTContext *s, FFTSample *output, const FFTSample *input);
|
|
void ff_imdct_half_c(FFTContext *s, FFTSample *output, const FFTSample *input);
|
|
void ff_mdct_calc_c(FFTContext *s, FFTSample *output, const FFTSample *input);
|
|
void ff_mdct_end(FFTContext *s);
|
|
|
|
/* Real Discrete Fourier Transform */
|
|
|
|
struct RDFTContext {
|
|
int nbits;
|
|
int inverse;
|
|
int sign_convention;
|
|
|
|
/* pre/post rotation tables */
|
|
const FFTSample *tcos;
|
|
SINTABLE_CONST FFTSample *tsin;
|
|
FFTContext fft;
|
|
void (*rdft_calc)(struct RDFTContext *s, FFTSample *z);
|
|
};
|
|
|
|
/**
|
|
* Sets up a real FFT.
|
|
* @param nbits log2 of the length of the input array
|
|
* @param trans the type of transform
|
|
*/
|
|
int ff_rdft_init(RDFTContext *s, int nbits, enum RDFTransformType trans);
|
|
void ff_rdft_end(RDFTContext *s);
|
|
|
|
void ff_rdft_init_arm(RDFTContext *s);
|
|
|
|
static av_always_inline void ff_rdft_calc(RDFTContext *s, FFTSample *data)
|
|
{
|
|
s->rdft_calc(s, data);
|
|
}
|
|
|
|
/* Discrete Cosine Transform */
|
|
|
|
struct DCTContext {
|
|
int nbits;
|
|
int inverse;
|
|
RDFTContext rdft;
|
|
const float *costab;
|
|
FFTSample *csc2;
|
|
void (*dct_calc)(struct DCTContext *s, FFTSample *data);
|
|
};
|
|
|
|
/**
|
|
* Sets up DCT.
|
|
* @param nbits size of the input array:
|
|
* (1 << nbits) for DCT-II, DCT-III and DST-I
|
|
* (1 << nbits) + 1 for DCT-I
|
|
*
|
|
* @note the first element of the input of DST-I is ignored
|
|
*/
|
|
int ff_dct_init(DCTContext *s, int nbits, enum DCTTransformType type);
|
|
void ff_dct_calc(DCTContext *s, FFTSample *data);
|
|
void ff_dct_end (DCTContext *s);
|
|
|
|
#endif /* AVCODEC_FFT_H */
|