1a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber/* ------------------------------------------------------------------ 2a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber * Copyright (C) 1998-2009 PacketVideo 3a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber * 4a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber * Licensed under the Apache License, Version 2.0 (the "License"); 5a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber * you may not use this file except in compliance with the License. 6a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber * You may obtain a copy of the License at 7a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber * 8a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber * http://www.apache.org/licenses/LICENSE-2.0 9a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber * 10a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber * Unless required by applicable law or agreed to in writing, software 11a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber * distributed under the License is distributed on an "AS IS" BASIS, 12a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either 13a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber * express or implied. 14a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber * See the License for the specific language governing permissions 15a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber * and limitations under the License. 16a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber * ------------------------------------------------------------------- 17a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber */ 18a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber/**************************************************************************************** 19a30d40083856cb4edd225faf8b488fab156e5976Andreas HuberPortions of this file are derived from the following 3GPP standard: 20a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber 21a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber 3GPP TS 26.073 22a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber ANSI-C code for the Adaptive Multi-Rate (AMR) speech codec 23a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber Available from http://www.3gpp.org 24a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber 25a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber(C) 2004, 3GPP Organizational Partners (ARIB, ATIS, CCSA, ETSI, TTA, TTC) 26a30d40083856cb4edd225faf8b488fab156e5976Andreas HuberPermission to distribute, modify and use this file under the standard license 27a30d40083856cb4edd225faf8b488fab156e5976Andreas Huberterms listed above has been obtained from the copyright holder. 28a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber****************************************************************************************/ 29a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber/* 30a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber 31a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber Pathname: ./gsm-amr/c/src/shr_r.c 32a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber 33a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber------------------------------------------------------------------------------ 34a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber REVISION HISTORY 35a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber 36a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber Description: Created separate file for the shr_r function. Sync'ed up 37a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber with the current template and fixed tabs. 38a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber 39a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber Description: Passing around pOverflow as per EPOC changes. 40a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber 41a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber Who: Date: 42a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber Description: 43a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber 44a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber------------------------------------------------------------------------------ 45a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber INPUT AND OUTPUT DEFINITIONS 46a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber 47a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber Inputs: 48a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber var1 = 16 bit short signed integer (Word16) whose value falls in 49a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber the range : 0xffff 8000 <= var1 <= 0x0000 7fff. 50a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber var2 = 16 bit short signed integer (Word16) whose value falls in 51a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber the range : 0xffff 8000 <= var2 <= 0x0000 7fff. 52a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber 53a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber Local Stores/Buffers/Pointers Needed: 54a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber None 55a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber 56a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber Global Stores/Buffers/Pointers Needed: 57a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber None 58a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber 59a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber Outputs: 60a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber var_out = shifted input w/ rounding (Word16) 61a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber 62a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber Pointers and Buffers Modified: 63a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber None 64a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber 65a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber Local Stores Modified: 66a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber None 67a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber 68a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber Global Stores Modified: 69a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber None 70a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber 71a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber------------------------------------------------------------------------------ 72a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber FUNCTION DESCRIPTION 73a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber 74a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber This function arithmetically shifts the 16 bit input var1 right var2 positions 75a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber with rounding. If var2 is negative, arithmetically shift var1 left by 76a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber -var2 with rounding. Saturate the result in case of underflows or 77a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber overflows. 78a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber 79a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber - If var2 is greater than zero : 80a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber if (sub(shl(shr(var1,var2),1),shr(var1,sub(var2,1)))) 81a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber is equal to zero 82a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber then 83a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber shr_r(var1,var2) = shr(var1,var2) 84a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber else 85a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber shr_r(var1,var2) = add(shr(var1,var2),1) 86a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber - If var2 is less than or equal to zero : 87a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber shr_r(var1,var2) = shr(var1,var2). 88a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber 89a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber------------------------------------------------------------------------------ 90a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber REQUIREMENTS 91a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber 92a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber None 93a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber 94a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber------------------------------------------------------------------------------ 95a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber REFERENCES 96a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber 97a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber [1] basicop2.c, ETS Version 2.0.0, February 8, 1999 98a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber 99a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber------------------------------------------------------------------------------ 100a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber PSEUDO-CODE 101a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber 102a30d40083856cb4edd225faf8b488fab156e5976Andreas HuberWord16 shr_r (Word16 var1, Word16 var2) 103a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber{ 104a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber Word16 var_out; 105a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber 106a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber if (var2 > 15) 107a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber { 108a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber var_out = 0; 109a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber } 110a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber else 111a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber { 112a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber var_out = shr (var1, var2); 113a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber#if (WMOPS) 114a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber multiCounter[currCounter].shr--; 115a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber#endif 116a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber 117a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber if (var2 > 0) 118a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber { 119a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber if ((var1 & ((Word16) 1 << (var2 - 1))) != 0) 120a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber { 121a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber var_out++; 122a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber } 123a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber } 124a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber } 125a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber#if (WMOPS) 126a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber multiCounter[currCounter].shr_r++; 127a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber#endif 128a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber return (var_out); 129a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber} 130a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber 131a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber------------------------------------------------------------------------------ 132a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber RESOURCES USED 133a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber When the code is written for a specific target processor the 134a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber the resources used should be documented below. 135a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber 136a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber STACK USAGE: [stack count for this module] + [variable to represent 137a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber stack usage for each subroutine called] 138a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber 139a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber where: [stack usage variable] = stack usage for [subroutine 140a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber name] (see [filename].ext) 141a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber 142a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber DATA MEMORY USED: x words 143a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber 144a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber PROGRAM MEMORY USED: x words 145a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber 146a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber CLOCK CYCLES: [cycle count equation for this module] + [variable 147a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber used to represent cycle count for each subroutine 148a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber called] 149a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber 150a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber where: [cycle count variable] = cycle count for [subroutine 151a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber name] (see [filename].ext) 152a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber 153a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber------------------------------------------------------------------------------ 154a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber*/ 155a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber 156a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber 157a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber/*---------------------------------------------------------------------------- 158a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber; INCLUDES 159a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber----------------------------------------------------------------------------*/ 160a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber#include "basic_op.h" 161a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber 162a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber/*---------------------------------------------------------------------------- 163a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber; MACROS 164a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber; Define module specific macros here 165a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber----------------------------------------------------------------------------*/ 166a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber 167a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber/*---------------------------------------------------------------------------- 168a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber; DEFINES 169a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber; Include all pre-processor statements here. Include conditional 170a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber; compile variables also. 171a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber----------------------------------------------------------------------------*/ 172a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber 173a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber/*---------------------------------------------------------------------------- 174a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber; LOCAL FUNCTION DEFINITIONS 175a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber; Function Prototype declaration 176a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber----------------------------------------------------------------------------*/ 177a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber 178a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber/*---------------------------------------------------------------------------- 179a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber; LOCAL STORE/BUFFER/POINTER DEFINITIONS 180a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber; Variable declaration - defined here and used outside this module 181a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber----------------------------------------------------------------------------*/ 182a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber 183a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber/*---------------------------------------------------------------------------- 184a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber; EXTERNAL FUNCTION REFERENCES 185a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber; Declare functions defined elsewhere and referenced in this module 186a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber----------------------------------------------------------------------------*/ 187a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber 188a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber/*---------------------------------------------------------------------------- 189a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber; EXTERNAL GLOBAL STORE/BUFFER/POINTER REFERENCES 190a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber; Declare variables used in this module but defined elsewhere 191a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber----------------------------------------------------------------------------*/ 192a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber 193a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber/*---------------------------------------------------------------------------- 194a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber; FUNCTION CODE 195a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber----------------------------------------------------------------------------*/ 196a30d40083856cb4edd225faf8b488fab156e5976Andreas HuberWord16 shr_r(register Word16 var1, register Word16 var2, Flag *pOverflow) 197a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber{ 198a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber /*---------------------------------------------------------------------------- 199a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber ; Define all local variables 200a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber ----------------------------------------------------------------------------*/ 201a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber Word16 var_out; 202a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber 203a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber /*---------------------------------------------------------------------------- 204a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber ; Function body here 205a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber ----------------------------------------------------------------------------*/ 206a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber if (var2 > 15) 207a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber { 208a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber var_out = 0; 209a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber } 210a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber else 211a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber { 212a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber var_out = shr(var1, var2, pOverflow); 213a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber if (var2 > 0) 214a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber { 215a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber if ((var1 & ((Word16) 1 << (var2 - 1))) != 0) 216a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber { 217a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber var_out++; 218a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber } 219a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber } 220a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber } 221a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber 222a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber /*---------------------------------------------------------------------------- 223a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber ; Return nothing or data or data pointer 224a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber ----------------------------------------------------------------------------*/ 225a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber return (var_out); 226a30d40083856cb4edd225faf8b488fab156e5976Andreas Huber} 227