backpred.h

MPEG-4编解码的实现(包括MPEG4视音频编解码)

/*
 * FAAC - Freeware Advanced Audio Coder
 * Copyright (C) 2001 Menno Bakker
 *
 * This library 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.
 *
 * This library 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 this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 * $Id: backpred.h,v 1.3 2001/06/04 23:02:24 wmay Exp $
 */

#ifndef _AAC_BACK_H_INCLUDED
#define _AAC_BACK_H_INCLUDED

#define PRED_ALPHA	0.90625
#define PRED_A		0.953125
#define PRED_B		0.953125

#define ALPHA PRED_ALPHA
#define A PRED_A
#define B PRED_B
#define MINVAR 1.e-10

/* Reset every RESET_FRAME frames. */
#define RESET_FRAME 8
 
void PredCalcPrediction(double *act_spec,
						double *last_spec,
						int btype,
						int nsfb,
						int *isfb_width,
						CoderInfo *coderInfo,
						ChannelInfo *channelInfo,
						int chanNum); 

void PredInit(faacEncHandle hEncoder);

void CopyPredInfo(CoderInfo *right, CoderInfo *left);


#endif