1 /* 2 * Copyright (C) 2004-2010 NXP Software 3 * Copyright (C) 2010 The Android Open Source Project 4 * 5 * Licensed under the Apache License, Version 2.0 (the "License"); 6 * you may not use this file except in compliance with the License. 7 * You may obtain a copy of the License at 8 * 9 * http://www.apache.org/licenses/LICENSE-2.0 10 * 11 * Unless required by applicable law or agreed to in writing, software 12 * distributed under the License is distributed on an "AS IS" BASIS, 13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 14 * See the License for the specific language governing permissions and 15 * limitations under the License. 16 */ 17 18 /********************************************************************************** 19 INCLUDE FILES 20 ***********************************************************************************/ 21 22 #include "VectorArithmetic.h" 23 24 /********************************************************************************** 25 FUNCTION From2iToMS_16x16 26 ***********************************************************************************/ 27 28 void From2iToMS_16x16( const LVM_INT16 *src, 29 LVM_INT16 *dstM, 30 LVM_INT16 *dstS, 31 LVM_INT16 n ) 32 { 33 LVM_INT32 temp1,left,right; 34 LVM_INT16 ii; 35 for (ii = n; ii != 0; ii--) 36 { 37 left = (LVM_INT32)*src; 38 src++; 39 40 right = (LVM_INT32)*src; 41 src++; 42 43 /* Compute M signal*/ 44 temp1 = (left+right)>>1; 45 *dstM = (LVM_INT16)temp1; 46 dstM++; 47 48 /* Compute S signal*/ 49 temp1 = (left-right)>>1; 50 *dstS = (LVM_INT16)temp1; 51 dstS++; 52 } 53 54 return; 55 } 56 #ifdef BUILD_FLOAT 57 void From2iToMS_Float( const LVM_FLOAT *src, 58 LVM_FLOAT *dstM, 59 LVM_FLOAT *dstS, 60 LVM_INT16 n ) 61 { 62 LVM_FLOAT temp1,left,right; 63 LVM_INT16 ii; 64 for (ii = n; ii != 0; ii--) 65 { 66 left = (LVM_FLOAT)*src; 67 src++; 68 69 right = (LVM_FLOAT)*src; 70 src++; 71 72 /* Compute M signal*/ 73 temp1 = (left + right) / 2.0f; 74 *dstM = (LVM_FLOAT)temp1; 75 dstM++; 76 77 /* Compute S signal*/ 78 temp1 = (left - right) / 2.0f; 79 *dstS = (LVM_FLOAT)temp1; 80 dstS++; 81 } 82 83 return; 84 } 85 #endif 86 /**********************************************************************************/ 87
