ref: fab854e3a169920ccd610717c50633fa11362db3
dir: /mc_enc.c/
/*
* Multichannel configuration
*
* Copyright (c) 1999 M. Bakker
*
* 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, 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; see the file COPYING. If not, write to
* the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
*/
/**************************************************************************
Version Control Information Method: CVS
Identifiers:
$Revision: 1.5 $
$Date: 2000/11/01 14:05:32 $ (check in)
$Author: menno $
*************************************************************************/
#include "mc_enc.h"
#include "quant.h"
void DetermineChInfo(AACQuantInfo *quantInfo, int numChannels, int lfePresent) {
/* If LFE present */
/* Num channels # of SCE's # of CPE's #of LFE's */
/* ============ ========== ========== ========= */
/* 1 1 0 0 */
/* 2 0 1 0 */
/* 3 1 1 0 */
/* 4 1 1 1 */
/* 5 1 2 0 */
/* For more than 5 channels, use the following elements: */
/* 2*N 1 2*(N-1) 1 */
/* 2*N+1 1 2*N 0 */
/* */
/* Else: */
/* */
/* Num channels # of SCE's # of CPE's #of LFE's */
/* ============ ========== ========== ========= */
/* 1 1 0 0 */
/* 2 0 1 0 */
/* 3 1 1 0 */
/* 4 2 1 0 */
/* 5 1 2 0 */
/* For more than 5 channels, use the following elements: */
/* 2*N 2 2*(N-1) 0 */
/* 2*N+1 1 2*N 0 */
int sceTag=0;
int lfeTag=0;
int cpeTag=0;
int numChannelsLeft=numChannels;
/* First element is sce, except for 2 channel case */
if (numChannelsLeft!=2) {
quantInfo[numChannels-numChannelsLeft].channelInfo.present = 1;
quantInfo[numChannels-numChannelsLeft].channelInfo.tag=sceTag++;
quantInfo[numChannels-numChannelsLeft].channelInfo.cpe=0;
quantInfo[numChannels-numChannelsLeft].channelInfo.lfe=0;
numChannelsLeft--;
}
/* Next elements are cpe's */
while (numChannelsLeft>1) {
/* Left channel info */
quantInfo[numChannels-numChannelsLeft].channelInfo.present = 1;
quantInfo[numChannels-numChannelsLeft].channelInfo.tag=cpeTag++;
quantInfo[numChannels-numChannelsLeft].channelInfo.cpe=1;
quantInfo[numChannels-numChannelsLeft].channelInfo.common_window=0;
quantInfo[numChannels-numChannelsLeft].channelInfo.ch_is_left=1;
quantInfo[numChannels-numChannelsLeft].channelInfo.paired_ch=numChannels-numChannelsLeft+1;
quantInfo[numChannels-numChannelsLeft].channelInfo.lfe=0;
numChannelsLeft--;
/* Right channel info */
quantInfo[numChannels-numChannelsLeft].channelInfo.present = 1;
quantInfo[numChannels-numChannelsLeft].channelInfo.cpe=1;
quantInfo[numChannels-numChannelsLeft].channelInfo.common_window=0;
quantInfo[numChannels-numChannelsLeft].channelInfo.ch_is_left=0;
quantInfo[numChannels-numChannelsLeft].channelInfo.paired_ch=numChannels-numChannelsLeft-1;
quantInfo[numChannels-numChannelsLeft].channelInfo.lfe=0;
numChannelsLeft--;
}
/* Is there another channel left ? */
if (numChannelsLeft) {
if (lfePresent) {
quantInfo[numChannels-numChannelsLeft].channelInfo.present = 1;
quantInfo[numChannels-numChannelsLeft].channelInfo.tag=lfeTag++;
quantInfo[numChannels-numChannelsLeft].channelInfo.cpe=0;
quantInfo[numChannels-numChannelsLeft].channelInfo.lfe=1;
} else {
quantInfo[numChannels-numChannelsLeft].channelInfo.present = 1;
quantInfo[numChannels-numChannelsLeft].channelInfo.tag=sceTag++;
quantInfo[numChannels-numChannelsLeft].channelInfo.cpe=0;
quantInfo[numChannels-numChannelsLeft].channelInfo.lfe=0;
}
numChannelsLeft--;
}
}