imdct.h

mp3解码源代码

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

/*
 *	imdct.h -- IMDCT table data structure
 *
 *	Author  :   St閜hane TAVENARD
 *
 *	(C) Copyright 1997-1998 St閜hane TAVENARD
 *	    All Rights Reserved
 *
 *	This program is free software; you can redistribute it and/or modify
 *	it under the terms of the GNU General Public License as published by
 *	the Free Software Foundation; either version 2 of the License, or
 *	(at your option) any later version.
 * 
 *	This program 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 General Public License for more details.
 * 
 *	You should have received a copy of the GNU General Public License
 *	along with this program; if not, write to the Free Software
 *	Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

/****************************************************************************/
#ifndef IMDCT_H
#define	IMDCT_H
/****************************************************************************/

static short win[2][4][36] =
{
    {
	/* Start of row 0 */
	{
		  714,  2138,  3546,  4926, 
		 6269,  7565,  8803,  9973, 
		11068, 12079, 12998, 13818, 
		14532, 15136, 15625, 15995, 
		16243, 16368, 16368, 16243, 
		15995, 15625, 15136, 14532, 
		13818, 12998, 12079, 11068, 
		 9973,  8803,  7565,  6269, 
		 4926,  3546,  2138,   714 
	},

	/* Start of row 1 */
	{
		  714,  2138,  3546,  4926, 
		 6269,  7565,  8803,  9973, 
		11068, 12079, 12998, 13818, 
		14532, 15136, 15625, 15995, 
		16243, 16368, 16384, 16384, 
		16384, 16384, 16384, 16384, 
		16243, 15136, 12998,  9973, 
		 6269,  2138,     0,     0, 
		    0,     0,     0,     0 
	},

	/* Start of row 2 */
	{
		 2138,  6269,  9973, 12998, 
		15136, 16243, 16243, 15136, 
		12998,  9973,  6269,  2138, 
		    0,     0,     0,     0, 
		    0,     0,     0,     0, 
		    0,     0,     0,     0, 
		    0,     0,     0,     0, 
		    0,     0,     0,     0, 
		    0,     0,     0,     0 
	},

	/* Start of row 3 */
	{
		    0,     0,     0,     0, 
		    0,     0,  2138,  6269, 
		 9973, 12998, 15136, 16243, 
		16384, 16384, 16384, 16384, 
		16384, 16384, 16368, 16243, 
		15995, 15625, 15136, 14532, 
		13818, 12998, 12079, 11068, 
		 9973,  8803,  7565,  6269, 
		 4926,  3546,  2138,   714 
	},
    },

    /* Start of second half of table */
    {
	/* Start of row 0 */
	{
		  714,  -2138,  3546,  -4926, 
		 6269,  -7565,  8803,  -9973, 
		11068, -12079, 12998, -13818, 
		14532, -15136, 15625, -15995, 
		16243, -16368, 16368, -16243, 
		15995, -15625, 15136, -14532, 
		13818, -12998, 12079, -11068, 
		 9973,  -8803,  7565,  -6269, 
		 4926,  -3546,  2138,   -714 
	},

	/* Start of row 1 */
	{
		  714,  -2138,  3546,  -4926, 
		 6269,  -7565,  8803,  -9973, 
		11068, -12079, 12998, -13818, 
		14532, -15136, 15625, -15995, 
		16243, -16368, 16384, -16384, 
		16384, -16384, 16384, -16384, 
		16243, -15136, 12998,  -9973, 
		 6269,  -2138,     0,      0, 
		    0,      0,     0,      0 
	},

	/* Start of row 2 */
	{
		 2138,  -6269,  9973, -12998, 
		15136, -16243, 16243, -15136, 
		12998,  -9973,  6269,  -2138, 
		    0,      0,     0,      0, 
		    0,      0,     0,      0, 
		    0,      0,     0,      0, 
		    0,      0,     0,      0, 
		    0,      0,     0,      0, 
		    0,      0,     0,      0 
	},

	/* Start of row 3 */
	{
		    0,      0,     0,      0, 
		    0,      0,  2138,  -6269, 
		 9973, -12998, 15136, -16243, 
		16384, -16384, 16384, -16384, 
		16384, -16384, 16368, -16243, 
		15995, -15625, 15136, -14532, 
		13818, -12998, 12079, -11068, 
		 9973,  -8803,  7565,  -6269, 
		 4926,  -3546,  2138,   -714 
	},
    }
};

/****************************************************************************/
#endif /* IMDCT_H */