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