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/*
** Copyright 2003-2010, VisualOn, Inc.
**
** Licensed under the Apache License, Version 2.0 (the "License");
** you may not use this file except in compliance with the License.
** You may obtain a copy of the License at
**
** http://www.apache.org/licenses/LICENSE-2.0
**
** Unless required by applicable law or agreed to in writing, software
** distributed under the License is distributed on an "AS IS" BASIS,
** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
** See the License for the specific language governing permissions and
** limitations under the License.
*/
/*******************************************************************************
File: channel_map.c
Content: channel mapping functions
*******************************************************************************/
#include "channel_map.h"
#include "bitenc.h"
#include "psy_const.h"
#include "qc_data.h"
static const Word16 maxChannelBits = MAXBITS_COEF;
static Word16 initElement(ELEMENT_INFO* elInfo, ELEMENT_TYPE elType)
{
Word16 error=0;
elInfo->elType=elType;
switch(elInfo->elType) {
case ID_SCE:
elInfo->nChannelsInEl=1;
elInfo->ChannelIndex[0]=0;
elInfo->instanceTag=0;
break;
case ID_CPE:
elInfo->nChannelsInEl=2;
elInfo->ChannelIndex[0]=0;
elInfo->ChannelIndex[1]=1;
elInfo->instanceTag=0;
break;
default:
error=1;
}
return error;
}
Word16 InitElementInfo (Word16 nChannels, ELEMENT_INFO* elInfo)
{
Word16 error;
error = 0;
switch(nChannels) {
case 1:
initElement(elInfo, ID_SCE);
break;
case 2:
initElement(elInfo, ID_CPE);
break;
default:
error=4;
}
return error;
}
Word16 InitElementBits(ELEMENT_BITS *elementBits,
ELEMENT_INFO elInfo,
Word32 bitrateTot,
Word16 averageBitsTot,
Word16 staticBitsTot)
{
Word16 error;
error = 0;
switch(elInfo.nChannelsInEl) {
case 1:
elementBits->chBitrate = bitrateTot;
elementBits->averageBits = averageBitsTot - staticBitsTot;
elementBits->maxBits = maxChannelBits;
elementBits->maxBitResBits = maxChannelBits - averageBitsTot;
elementBits->maxBitResBits = elementBits->maxBitResBits - (elementBits->maxBitResBits & 7);
elementBits->bitResLevel = elementBits->maxBitResBits;
elementBits->relativeBits = 0x4000; /* 1.0f/2 */
break;
case 2:
elementBits->chBitrate = bitrateTot >> 1;
elementBits->averageBits = averageBitsTot - staticBitsTot;
elementBits->maxBits = maxChannelBits << 1;
elementBits->maxBitResBits = (maxChannelBits << 1) - averageBitsTot;
elementBits->maxBitResBits = elementBits->maxBitResBits - (elementBits->maxBitResBits & 7);
elementBits->bitResLevel = elementBits->maxBitResBits;
elementBits->relativeBits = 0x4000; /* 1.0f/2 */
break;
default:
error = 1;
}
return error;
}
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