ac3enc_fixed.h 1.97 KB
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/*
 * The simplest AC-3 encoder
 * Copyright (c) 2000 Fabrice Bellard
 * Copyright (c) 2006-2010 Justin Ruggles <justin.ruggles@gmail.com>
 * Copyright (c) 2006-2010 Prakash Punnoor <prakash@punnoor.de>
 *
 * 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 <stdint.h>


typedef int16_t SampleType;
typedef int32_t CoefType;
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typedef int64_t CoefSumType;
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#define MAC_COEF(d,a,b) MAC64(d,a,b)

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/**
 * 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 */