cookdata_float.h

Fixptcook[1].tar.gz, 固点运算的rm格式音频编解码源代码

/*
 * COOK compatible decoder floating point data types and constants
 * Copyright (c) 2003 Sascha Sommer
 * Copyright (c) 2005 Benjamin Larsson
 *
 * 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 cookdata_float.h
 * Cook AKA RealAudio G2 compatible decoder
 * floating point data types and constants
 */

#include <math.h>
typedef float REAL_T;


/**
 * Additional variables in COOKContext
 * for floating point routines.
 */
typedef struct {
    /* transform data */
    MDCTContext         mdct_ctx;
    DECLARE_ALIGNED_16(FFTSample, mdct_tmp[1024]);  /* temporary storage for imlt */
    float*              mlt_window;

    /* generatable tables */
    float               gain_table[23];
    float               pow2tab[127];
    float               rootpow2tab[127];
} realvars_t;


/* Set up types and include cook data.
 */ 
typedef float Q_t;
#define Q(x) (x)
typedef float C_t;
#define C(x) (x)
#include "cookdata.h"