PeerStreamer

/*

 * 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;

typedef int64_t CoefSumType;

#define MUL_COEF(a,b) MUL64(a,b)

/**

 * 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 */