1d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber/* ------------------------------------------------------------------ 2d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber * Copyright (C) 1998-2009 PacketVideo 3d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber * 4d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber * Licensed under the Apache License, Version 2.0 (the "License"); 5d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber * you may not use this file except in compliance with the License. 6d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber * You may obtain a copy of the License at 7d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber * 8d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber * http://www.apache.org/licenses/LICENSE-2.0 9d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber * 10d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber * Unless required by applicable law or agreed to in writing, software 11d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber * distributed under the License is distributed on an "AS IS" BASIS, 12d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either 13d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber * express or implied. 14d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber * See the License for the specific language governing permissions 15d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber * and limitations under the License. 16d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber * ------------------------------------------------------------------- 17d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber */ 18d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber/**************************************************************************************** 19d49b526dd2009270cb15f7fe4e70b74673950608Andreas HuberPortions of this file are derived from the following 3GPP standard: 20d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber 21d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber 3GPP TS 26.073 22d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber ANSI-C code for the Adaptive Multi-Rate (AMR) speech codec 23d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber Available from http://www.3gpp.org 24d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber 25d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber(C) 2004, 3GPP Organizational Partners (ARIB, ATIS, CCSA, ETSI, TTA, TTC) 26d49b526dd2009270cb15f7fe4e70b74673950608Andreas HuberPermission to distribute, modify and use this file under the standard license 27d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huberterms listed above has been obtained from the copyright holder. 28d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber****************************************************************************************/ 29d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber/* 30d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber 31d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber 32d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber 33d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber 34d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber Filename: /audio/gsm_amr/c/src/l_extract.c 35d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber 36d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber Date: 09/07/2000 37d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber 38d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber------------------------------------------------------------------------------ 39d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber REVISION HISTORY 40d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber 41d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber Description: Updated template. Changed function interface to pass in a 42d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber pointer to overflow flag into the function instead of using a 43d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber global flag. Changed names of function parameters for clarity. 44d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber Removed inclusion of unwanted header files. 45d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber 46d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber Description: 47d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber 48d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber------------------------------------------------------------------------------ 49d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber*/ 50d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber 51d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber/*---------------------------------------------------------------------------- 52d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber; INCLUDES 53d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber----------------------------------------------------------------------------*/ 54d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber#include "basic_op.h" 55d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber 56d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber/*---------------------------------------------------------------------------- 57d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber; MACROS 58d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber; [Define module specific macros here] 59d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber----------------------------------------------------------------------------*/ 60d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber 61d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber/*---------------------------------------------------------------------------- 62d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber; DEFINES 63d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber; [Include all pre-processor statements here. Include conditional 64d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber; compile variables also.] 65d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber----------------------------------------------------------------------------*/ 66d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber 67d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber/*---------------------------------------------------------------------------- 68d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber; LOCAL FUNCTION DEFINITIONS 69d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber; [List function prototypes here] 70d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber----------------------------------------------------------------------------*/ 71d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber 72d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber/*---------------------------------------------------------------------------- 73d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber; LOCAL VARIABLE DEFINITIONS 74d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber; [Variable declaration - defined here and used outside this module] 75d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber----------------------------------------------------------------------------*/ 76d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber 77d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber 78d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber/* 79d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber------------------------------------------------------------------------------ 80d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber FUNCTION NAME: L_extract 81d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber------------------------------------------------------------------------------ 82d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber INPUT AND OUTPUT DEFINITIONS 83d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber 84d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber Inputs: 85d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber L_var = 32 bit signed integer (Word32) whose value falls 86d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber in the range : 0x8000 0000 <= L_32 <= 0x7fff ffff. 87d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber 88d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber pL_var_hi = pointer to the most significant word of L_var (Word16). 89d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber 90d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber pL_var_lo = pointer to the least significant word of L_var shifted 91d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber to the left by 1 (Word16). 92d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber 93d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber pOverflow = pointer to overflow (Flag) 94d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber 95d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber Outputs: 96d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber pOverflow -> 1 if the 32 bit add operation resulted in overflow 97d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber pL_var_hi -> MS word of L_32. 98d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber pL_var_lo -> LS word of L_32 shifted left by 1. 99d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber 100d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber Returns: 101d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber None 102d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber 103d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber Global Variables Used: 104d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber None 105d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber 106d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber Local Variables Needed: 107d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber None 108d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber 109d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber------------------------------------------------------------------------------ 110d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber FUNCTION DESCRIPTION 111d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber 112d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber This function extracts two 16-bit double precision format (DPF) numbers 113d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber from a 32-bit integer. The MS word of L_var will be stored in the location 114d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber pointed to by pL_var_hi and the shifted LS word of L_var will be stored in 115d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber the location pointed to by pL_var_lo. 116d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber 117d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber------------------------------------------------------------------------------ 118d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber REQUIREMENTS 119d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber 120d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber None 121d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber 122d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber------------------------------------------------------------------------------ 123d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber REFERENCES 124d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber 125d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber [1] L_extract() function in oper_32b.c, UMTS GSM AMR speech codec, R99 - 126d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber Version 3.2.0, March 2, 2001 127d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber 128d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber------------------------------------------------------------------------------ 129d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber PSEUDO-CODE 130d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber 131d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber 132d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber------------------------------------------------------------------------------ 133d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber RESOURCES USED [optional] 134d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber 135d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber When the code is written for a specific target processor the 136d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber the resources used should be documented below. 137d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber 138d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber HEAP MEMORY USED: x bytes 139d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber 140d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber STACK MEMORY USED: x bytes 141d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber 142d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber CLOCK CYCLES: (cycle count equation for this function) + (variable 143d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber used to represent cycle count for each subroutine 144d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber called) 145d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber where: (cycle count variable) = cycle count for [subroutine 146d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber name] 147d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber 148d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber------------------------------------------------------------------------------ 149d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber CAUTION [optional] 150d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber [State any special notes, constraints or cautions for users of this function] 151d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber 152d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber------------------------------------------------------------------------------ 153d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber*/ 154d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber 155d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber/*---------------------------------------------------------------------------- 156d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber; FUNCTION CODE 157d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber----------------------------------------------------------------------------*/ 158d49b526dd2009270cb15f7fe4e70b74673950608Andreas Hubervoid L_Extract(Word32 L_var, 159d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber Word16 *pL_var_hi, 160d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber Word16 *pL_var_lo, 161d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber Flag *pOverflow) 162d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber{ 163d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber 164d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber Word32 temp; 165d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber 166d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber OSCL_UNUSED_ARG(pOverflow); 167d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber 168d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber temp = (L_var >> 16); 169d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber 170d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber *(pL_var_hi) = (Word16) temp; 171d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber *(pL_var_lo) = (Word16)((L_var >> 1) - (temp << 15)); 172d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber 173d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber return; 174d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber} 175