mirror of
https://github.com/FFmpeg/FFmpeg.git
synced 2024-12-23 12:43:46 +02:00
0aded9484d
This leaves fft.h with only the core FFT and MDCT definitions thus making it more managable. Signed-off-by: Mans Rullgard <mans@mansr.com>
75 lines
1.9 KiB
C
75 lines
1.9 KiB
C
/*
|
|
* (I)RDFT transforms
|
|
* Copyright (c) 2009 Alex Converse <alex dot converse at gmail dot com>
|
|
*
|
|
* This file is part of Libav.
|
|
*
|
|
* Libav 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.
|
|
*
|
|
* Libav 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 Libav; if not, write to the Free Software
|
|
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
|
|
*/
|
|
|
|
#ifndef AVCODEC_RDFT_H
|
|
#define AVCODEC_RDFT_H
|
|
|
|
#include "config.h"
|
|
#include "fft.h"
|
|
|
|
#if CONFIG_HARDCODED_TABLES
|
|
# define SINTABLE_CONST const
|
|
#else
|
|
# define SINTABLE_CONST
|
|
#endif
|
|
|
|
#define SINTABLE(size) \
|
|
SINTABLE_CONST DECLARE_ALIGNED(16, FFTSample, ff_sin_##size)[size/2]
|
|
|
|
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);
|
|
|
|
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);
|
|
};
|
|
|
|
/**
|
|
* Set 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);
|
|
|
|
|
|
#endif
|