F:/My Projects/LSEngine/Modules/LSSoundLib/Src/Ogg/LSSVorbisMdct.h

/********************************************************************
 *                                                                  *
 * THIS FILE IS PART OF THE OggVorbis SOFTWARE CODEC SOURCE CODE.   *
 * USE, DISTRIBUTION AND REPRODUCTION OF THIS LIBRARY SOURCE IS     *
 * GOVERNED BY A BSD-STYLE SOURCE LICENSE INCLUDED WITH THIS SOURCE *
 * IN 'COPYING'. PLEASE READ THESE TERMS BEFORE DISTRIBUTING.       *
 *                                                                  *
 * THE OggVorbis SOURCE CODE IS (C) COPYRIGHT 1994-2009             *
 * by the Xiph.Org Foundation http://www.xiph.org/                  *
 *                                                                  *
 ********************************************************************

 function: modified discrete cosine transform prototypes
 last mod: $Id: mdct.h 16227 2009-07-08 06:58:46Z xiphmont $

 ********************************************************************/


#ifndef __LSS_VORBISMDCT_H__
#define __LSS_VORBISMDCT_H__

#include "../LSSSoundLib.h"
#include "LSSVorbisConstants.h"

namespace lss {

        class CVorbisMdct {
        public :
                // == Types.
                typedef struct mdct_lookup {
                        LSINT32                                         n;
                        LSINT32                                         log2n;

                        DATA_TYPE *                                     trig;
                        LSINT32 *                                       bitrev;

                        DATA_TYPE                                       scale;
                } * LPmdct_lookup, * const LPCmdct_lookup;


                // == Functions.
                static LSVOID                                   mdct_init( mdct_lookup * _plLookUp, LSINT32 _i32N );

                static LSVOID                                   mdct_clear( mdct_lookup * _plLookUp );

                static LSVOID                                   mdct_forward( mdct_lookup * _plInit, DATA_TYPE * _pdtIn, DATA_TYPE * _pdtOut );

                static LSVOID                                   mdct_backward( mdct_lookup * _plInit, DATA_TYPE * _pdtIn, DATA_TYPE * _pdtOut );


        protected :
                // == Functions.
                static LSVOID                                   mdct_butterflies( mdct_lookup * _plInit,
                        DATA_TYPE * _pdtX,
                        LSINT32 _i32Points );

                static LSVOID                                   mdct_bitreverse( mdct_lookup * _plInit,
                        DATA_TYPE * _pdtX );

                static LSVOID                                   mdct_butterfly_first( DATA_TYPE * _pdtT,
                        DATA_TYPE * _pdtX,
                        LSINT32 _i32Points );

                static LSVOID                                   mdct_butterfly_generic( DATA_TYPE * _pdtT,
                        DATA_TYPE *_pdtX,
                        LSINT32 _i32Points,
                        LSINT32 _i32TrigInt );

                static LSVOID                                   mdct_butterfly_32( DATA_TYPE * _pdtX );

                static LSVOID                                   mdct_butterfly_16( DATA_TYPE * _pdtX );

                static LSVOID                                   mdct_butterfly_8( DATA_TYPE * _pdtX );
        };

}       // namespace lss

#endif  // __LSS_VORBISMDCT_H__