/*
* The simplest AC-3 encoder
* Copyright (c) 2000 Fabrice Bellard
* Copyright (c) 2006-2010 Justin Ruggles
* Copyright (c) 2006-2010 Prakash Punnoor
*
* 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
*/
/**
* @file
* fixed-point AC-3 encoder header.
*/
#ifndef AVCODEC_AC3ENC_FIXED_H
#define AVCODEC_AC3ENC_FIXED_H
#include
typedef int16_t SampleType;
typedef int32_t CoefType;
#define SCALE_COEF(a) (a)
/**
* Compex number.
* Used in fixed-point MDCT calculation.
*/
typedef struct IComplex {
int16_t re,im;
} IComplex;
typedef struct AC3MDCTContext {
const int16_t *window; ///< MDCT window function
int nbits; ///< log2(transform size)
int16_t *costab; ///< FFT cos table
int16_t *sintab; ///< FFT sin table
int16_t *xcos1; ///< MDCT cos table
int16_t *xsin1; ///< MDCT sin table
int16_t *rot_tmp; ///< temp buffer for pre-rotated samples
IComplex *cplx_tmp; ///< temp buffer for complex pre-rotated samples
} AC3MDCTContext;
#endif /* AVCODEC_AC3ENC_FIXED_H */