| /*
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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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| ** 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: spreading.c
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|
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| Content: Spreading of energy function
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|
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| *******************************************************************************/
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|
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| #include "basic_op.h"
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| #include "oper_32b.h"
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| #include "spreading.h"
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|
|
| /********************************************************************************* |
| * |
| * function name: SpreadingMax |
| * description: spreading the energy |
| * higher frequencies thr(n) = max(thr(n), sh(n)*thr(n-1)) |
| * lower frequencies thr(n) = max(thr(n), sl(n)*thr(n+1)) |
| * |
| **********************************************************************************/
|
| void SpreadingMax(const Word16 pbCnt,
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| const Word16 *maskLowFactor,
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| const Word16 *maskHighFactor,
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| Word32 *pbSpreadedEnergy)
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| {
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| Word32 i;
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|
|
| /* slope to higher frequencies */
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| for (i=1; i<pbCnt; i++) {
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| pbSpreadedEnergy[i] = max(pbSpreadedEnergy[i],
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| L_mpy_ls(pbSpreadedEnergy[i-1], maskHighFactor[i]));
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| }
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| /* slope to lower frequencies */
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| for (i=pbCnt - 2; i>=0; i--) {
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| pbSpreadedEnergy[i] = max(pbSpreadedEnergy[i],
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| L_mpy_ls(pbSpreadedEnergy[i+1], maskLowFactor[i]));
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| }
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| }
|