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 Pathname: ./audio/gsm-amr/c/src/pre_proc.c 35d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber Funtions: Pre_Process_init 36d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber Pre_Process_reset 37d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber Pre_Process_exit 38d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber Pre_Process 39d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber 40d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber Date: 05/17/2000 41d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber 42d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber------------------------------------------------------------------------------ 43d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber REVISION HISTORY 44d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber 45d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber Description: Put the file into our template structure. 46d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber 47d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber Description: First pass optimization. 48d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber 49d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber Description: Made changes based on comments from review meeting. 50d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber 51d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber Description: Synchronized file with UMTS version 3.2.0. Updated coding 52d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber template. Removed unnecessary include files. 53d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber 54d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber Description: Removed basic_op.h from the Include section. It is not used. 55d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber 56d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber Description: Made the following changes per comments from Phase 2/3 review: 57d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber 1. Fixed typecasting issue with TI C compiler. 58d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber 2. Modified FOR loop to count down. 59d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber 3. Cosmetic changes to the code to make address post-increment 60d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber clearer. 61d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber 4. Removed unnecessary typecasting in the multiply-accumulate 62d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber portion of FOR loop body. 63d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber 5. Removed "static" in table definitions. 64d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber 6. Updated copyright year. 65d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber 66d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber Description: For Pre_Process() 67d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber 1. Replaced variables (containing filter coefficients) with 68d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber constants, to avoid extra register swaping. 69d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber 2. Changed to decrement loop 70d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber 71d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber Description: Replaced OSCL mem type functions and eliminated include 72d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber files that now are chosen by OSCL definitions 73d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber 74d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber Description: Replaced "int" and/or "char" with OSCL defined types. 75d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber 76d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber Description: Changed round function name to pv_round to avoid conflict with 77d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber round function in C standard library. 78d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber 79d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber Description: 80d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber 81d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber------------------------------------------------------------------------------ 82d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber MODULE DESCRIPTION 83d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber 84d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber These modules handle the preprocessing of input speech. 85d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber 86d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber------------------------------------------------------------------------------ 87d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber*/ 88d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber 89d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber 90d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber/*---------------------------------------------------------------------------- 91d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber; INCLUDES 92d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber----------------------------------------------------------------------------*/ 93d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber#include <stdlib.h> 94d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber 95d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber#include "pre_proc.h" 96d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber#include "typedef.h" 97d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber 98d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber/*---------------------------------------------------------------------------- 99d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber; MACROS 100d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber; Define module specific macros here 101d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber----------------------------------------------------------------------------*/ 102d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber 103d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber 104d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber/*---------------------------------------------------------------------------- 105d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber; DEFINES 106d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber; Include all pre-processor statements here. Include conditional 107d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber; compile variables also. 108d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber----------------------------------------------------------------------------*/ 109d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber 110d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber 111d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber/*---------------------------------------------------------------------------- 112d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber; LOCAL FUNCTION DEFINITIONS 113d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber; Function Prototype declaration 114d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber----------------------------------------------------------------------------*/ 115d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber 116d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber/*---------------------------------------------------------------------------- 117d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber; LOCAL VARIABLE DEFINITIONS 118d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber; Variable declaration - defined here and used outside this module 119d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber----------------------------------------------------------------------------*/ 120d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber 121d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber 122d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber 123d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber 124d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber/* 125d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber------------------------------------------------------------------------------ 126d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber FUNCTION NAME: Pre_Process_init 127d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber------------------------------------------------------------------------------ 128d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber INPUT AND OUTPUT DEFINITIONS 129d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber 130d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber Inputs: 131d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber state = pointer to an array of pointer to structures of type 132d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber Pre_ProcessState 133d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber 134d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber Outputs: 135d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber Structure pointed to by the pointer pointed to by state is 136d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber initialized to its reset value 137d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber state points to the allocated memory 138d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber 139d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber Returns: 140d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber return_value = 0 if memory was successfully initialized, 141d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber otherwise returns -1. 142d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber 143d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber Global Variables Used: 144d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber None. 145d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber 146d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber Local Variables Needed: 147d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber None. 148d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber 149d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber------------------------------------------------------------------------------ 150d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber FUNCTION DESCRIPTION 151d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber 152d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber Allocates state memory and initializes state memory. 153d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber 154d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber------------------------------------------------------------------------------ 155d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber REQUIREMENTS 156d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber 157d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber None. 158d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber 159d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber------------------------------------------------------------------------------ 160d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber REFERENCES 161d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber 162d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber pre_proc.c, UMTS GSM AMR speech codec, R99 - Version 3.2.0, March 2, 2001 163d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber 164d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber------------------------------------------------------------------------------ 165d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber PSEUDO-CODE 166d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber 167d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huberint Pre_Process_init (Pre_ProcessState **state) 168d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber{ 169d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber Pre_ProcessState* s; 170d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber 171d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber if (state == (Pre_ProcessState **) NULL){ 172d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber fprintf(stderr, "Pre_Process_init: invalid parameter\n"); 173d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber return -1; 174d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber } 175d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber *state = NULL; 176d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber 177d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber // allocate memory 178d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber if ((s= (Pre_ProcessState *) malloc(sizeof(Pre_ProcessState))) == NULL){ 179d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber fprintf(stderr, "Pre_Process_init: can not malloc state structure\n"); 180d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber return -1; 181d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber } 182d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber 183d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber Pre_Process_reset(s); 184d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber *state = s; 185d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber 186d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber return 0; 187d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber} 188d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber 189d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber------------------------------------------------------------------------------ 190d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber RESOURCES USED [optional] 191d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber 192d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber When the code is written for a specific target processor the 193d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber the resources used should be documented below. 194d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber 195d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber HEAP MEMORY USED: x bytes 196d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber 197d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber STACK MEMORY USED: x bytes 198d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber 199d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber CLOCK CYCLES: (cycle count equation for this function) + (variable 200d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber used to represent cycle count for each subroutine 201d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber called) 202d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber where: (cycle count variable) = cycle count for [subroutine 203d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber name] 204d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber 205d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber------------------------------------------------------------------------------ 206d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber CAUTION [optional] 207d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber [State any special notes, constraints or cautions for users of this function] 208d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber 209d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber------------------------------------------------------------------------------ 210d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber*/ 211d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber 212d49b526dd2009270cb15f7fe4e70b74673950608Andreas HuberWord16 Pre_Process_init(Pre_ProcessState **state) 213d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber{ 214d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber Pre_ProcessState* s; 215d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber 216d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber if (state == (Pre_ProcessState **) NULL) 217d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber { 218d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber /* fprintf(stderr, "Pre_Process_init: invalid parameter\n"); */ 219d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber return(-1); 220d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber } 221d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber *state = NULL; 222d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber 223d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber /* allocate memory */ 224d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber if ((s = (Pre_ProcessState *) malloc(sizeof(Pre_ProcessState))) == NULL) 225d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber { 226d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber /* fprintf(stderr, "Pre_Process_init: 227d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber can not malloc state structure\n"); */ 228d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber return(-1); 229d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber } 230d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber 231d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber Pre_Process_reset(s); 232d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber *state = s; 233d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber 234d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber return(0); 235d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber} 236d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber 237d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber/****************************************************************************/ 238d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber 239d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber 240d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber/* 241d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber------------------------------------------------------------------------------ 242d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber FUNCTION NAME: Pre_Process_reset 243d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber------------------------------------------------------------------------------ 244d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber INPUT AND OUTPUT DEFINITIONS 245d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber 246d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber Inputs: 247d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber state = pointer to structure of type Pre_ProcessState 248d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber 249d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber Outputs: 250d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber Structure pointed to by state is initialized to zero. 251d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber 252d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber Returns: 253d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber return_value = 0 if memory was successfully reset, 254d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber otherwise returns -1. 255d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber 256d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber Global Variables Used: 257d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber None. 258d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber 259d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber Local Variables Needed: 260d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber None. 261d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber 262d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber------------------------------------------------------------------------------ 263d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber FUNCTION DESCRIPTION 264d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber 265d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber Initializes state memory to zero. 266d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber 267d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber------------------------------------------------------------------------------ 268d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber REQUIREMENTS 269d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber 270d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber None. 271d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber 272d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber------------------------------------------------------------------------------ 273d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber REFERENCES 274d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber 275d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber pre_proc.c, UMTS GSM AMR speech codec, R99 - Version 3.2.0, March 2, 2001 276d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber 277d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber------------------------------------------------------------------------------ 278d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber PSEUDO-CODE 279d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber 280d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huberint Pre_Process_reset (Pre_ProcessState *state) 281d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber{ 282d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber if (state == (Pre_ProcessState *) NULL){ 283d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber fprintf(stderr, "Pre_Process_reset: invalid parameter\n"); 284d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber return -1; 285d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber } 286d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber 287d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber state->y2_hi = 0; 288d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber state->y2_lo = 0; 289d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber state->y1_hi = 0; 290d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber state->y1_lo = 0; 291d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber state->x0 = 0; 292d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber state->x1 = 0; 293d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber 294d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber return 0; 295d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber} 296d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber 297d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber------------------------------------------------------------------------------ 298d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber RESOURCES USED [optional] 299d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber 300d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber When the code is written for a specific target processor the 301d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber the resources used should be documented below. 302d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber 303d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber HEAP MEMORY USED: x bytes 304d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber 305d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber STACK MEMORY USED: x bytes 306d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber 307d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber CLOCK CYCLES: (cycle count equation for this function) + (variable 308d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber used to represent cycle count for each subroutine 309d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber called) 310d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber where: (cycle count variable) = cycle count for [subroutine 311d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber name] 312d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber 313d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber------------------------------------------------------------------------------ 314d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber CAUTION [optional] 315d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber [State any special notes, constraints or cautions for users of this function] 316d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber 317d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber------------------------------------------------------------------------------ 318d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber*/ 319d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber 320d49b526dd2009270cb15f7fe4e70b74673950608Andreas HuberWord16 Pre_Process_reset(Pre_ProcessState *state) 321d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber{ 322d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber if (state == (Pre_ProcessState *) NULL) 323d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber { 324d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber /* fprintf(stderr, "Pre_Process_reset: invalid parameter\n"); */ 325d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber return(-1); 326d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber } 327d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber 328d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber state->y2_hi = 0; 329d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber state->y2_lo = 0; 330d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber state->y1_hi = 0; 331d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber state->y1_lo = 0; 332d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber state->x0 = 0; 333d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber state->x1 = 0; 334d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber 335d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber return(0); 336d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber} 337d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber 338d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber/****************************************************************************/ 339d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber 340d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber 341d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber/* 342d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber------------------------------------------------------------------------------ 343d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber FUNCTION NAME: Pre_Process_exit 344d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber------------------------------------------------------------------------------ 345d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber INPUT AND OUTPUT DEFINITIONS 346d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber 347d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber Inputs: 348d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber state = a pointer to an array of pointers to structures of 349d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber type Pre_ProcessState 350d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber 351d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber Outputs: 352d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber state points to a NULL address 353d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber 354d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber Returns: 355d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber None. 356d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber 357d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber Global Variables Used: 358d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber None. 359d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber 360d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber Local Variables Needed: 361d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber None. 362d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber 363d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber------------------------------------------------------------------------------ 364d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber FUNCTION DESCRIPTION 365d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber 366d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber The memory used for state memory is freed. 367d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber 368d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber------------------------------------------------------------------------------ 369d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber REQUIREMENTS 370d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber 371d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber None. 372d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber 373d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber------------------------------------------------------------------------------ 374d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber REFERENCES 375d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber 376d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber pre_proc.c, UMTS GSM AMR speech codec, R99 - Version 3.2.0, March 2, 2001 377d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber 378d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber------------------------------------------------------------------------------ 379d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber PSEUDO-CODE 380d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber 381d49b526dd2009270cb15f7fe4e70b74673950608Andreas Hubervoid Pre_Process_exit (Pre_ProcessState **state) 382d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber{ 383d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber if (state == NULL || *state == NULL) 384d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber return; 385d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber 386d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber // deallocate memory 387d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber free(*state); 388d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber *state = NULL; 389d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber 390d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber return; 391d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber} 392d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber 393d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber------------------------------------------------------------------------------ 394d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber RESOURCES USED [optional] 395d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber 396d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber When the code is written for a specific target processor the 397d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber the resources used should be documented below. 398d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber 399d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber HEAP MEMORY USED: x bytes 400d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber 401d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber STACK MEMORY USED: x bytes 402d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber 403d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber CLOCK CYCLES: (cycle count equation for this function) + (variable 404d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber used to represent cycle count for each subroutine 405d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber called) 406d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber where: (cycle count variable) = cycle count for [subroutine 407d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber name] 408d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber 409d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber------------------------------------------------------------------------------ 410d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber CAUTION [optional] 411d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber [State any special notes, constraints or cautions for users of this function] 412d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber 413d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber------------------------------------------------------------------------------ 414d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber*/ 415d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber 416d49b526dd2009270cb15f7fe4e70b74673950608Andreas Hubervoid Pre_Process_exit(Pre_ProcessState **state) 417d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber{ 418d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber if (state == NULL || *state == NULL) 419d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber { 420d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber return; 421d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber } 422d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber 423d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber /* deallocate memory */ 424d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber free(*state); 425d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber *state = NULL; 426d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber 427d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber return; 428d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber} 429d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber 430d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber/****************************************************************************/ 431d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber 432d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber/* 433d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber------------------------------------------------------------------------------ 434d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber FUNCTION NAME: Pre_Process 435d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber------------------------------------------------------------------------------ 436d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber INPUT AND OUTPUT DEFINITIONS 437d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber 438d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber Inputs: 439d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber st = a pointer to a structure of type Pre_ProcessState 440d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber signal = input/output signal (Word16) 441d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber lg = length of signal (Word16) 442d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber 443d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber Outputs: 444d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber st points to the updated structure 445d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber 446d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber Returns: 447d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber return_value = 0 (int) 448d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber 449d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber Global Variables Used: 450d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber a = points to a buffer of filter coefficients 451d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber b = points to a buffer of filter coefficients 452d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber 453d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber Local Variables Needed: 454d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber None. 455d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber 456d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber------------------------------------------------------------------------------ 457d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber FUNCTION DESCRIPTION 458d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber 459d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber This module performs the preprocessing of the input speech. 460d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber The signal is passed through a 2nd order high pass filtering with cut off 461d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber frequency at 80 Hz. The input is divided by two in the filtering process. 462d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber 463d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber y[i] = b[0]*x[i]/2 + b[1]*x[i-1]/2 + b[2]*x[i-2]/2 464d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber + a[1]*y[i-1] + a[2]*y[i-2]; 465d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber 466d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber------------------------------------------------------------------------------ 467d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber REQUIREMENTS 468d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber 469d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber None. 470d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber 471d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber------------------------------------------------------------------------------ 472d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber REFERENCES 473d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber 474d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber pre_proc.c, UMTS GSM AMR speech codec, R99 - Version 3.2.0, March 2, 2001 475d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber 476d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber------------------------------------------------------------------------------ 477d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber PSEUDO-CODE 478d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber 479d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huberint Pre_Process ( 480d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber Pre_ProcessState *st, 481d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber Word16 signal[], // input/output signal 482d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber Word16 lg) // lenght of signal 483d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber{ 484d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber Word16 i, x2; 485d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber Word32 L_tmp; 486d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber 487d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber for (i = 0; i < lg; i++) 488d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber { 489d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber x2 = st->x1; 490d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber st->x1 = st->x0; 491d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber st->x0 = signal[i]; 492d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber 493d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber // y[i] = b[0]*x[i]/2 + b[1]*x[i-1]/2 + b140[2]*x[i-2]/2 494d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber // + a[1]*y[i-1] + a[2] * y[i-2]; 495d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber 496d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber L_tmp = Mpy_32_16 (st->y1_hi, st->y1_lo, a[1]); 497d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber L_tmp = L_add (L_tmp, Mpy_32_16 (st->y2_hi, st->y2_lo, a[2])); 498d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber L_tmp = L_mac (L_tmp, st->x0, b[0]); 499d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber L_tmp = L_mac (L_tmp, st->x1, b[1]); 500d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber L_tmp = L_mac (L_tmp, x2, b[2]); 501d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber L_tmp = L_shl (L_tmp, 3); 502d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber signal[i] = pv_round (L_tmp); 503d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber 504d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber st->y2_hi = st->y1_hi; 505d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber st->y2_lo = st->y1_lo; 506d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber L_Extract (L_tmp, &st->y1_hi, &st->y1_lo); 507d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber } 508d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber return 0; 509d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber} 510d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber 511d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber------------------------------------------------------------------------------ 512d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber RESOURCES USED [optional] 513d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber 514d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber When the code is written for a specific target processor the 515d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber the resources used should be documented below. 516d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber 517d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber HEAP MEMORY USED: x bytes 518d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber 519d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber STACK MEMORY USED: x bytes 520d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber 521d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber CLOCK CYCLES: (cycle count equation for this function) + (variable 522d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber used to represent cycle count for each subroutine 523d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber called) 524d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber where: (cycle count variable) = cycle count for [subroutine 525d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber name] 526d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber 527d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber------------------------------------------------------------------------------ 528d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber CAUTION [optional] 529d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber [State any special notes, constraints or cautions for users of this function] 530d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber 531d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber------------------------------------------------------------------------------ 532d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber*/ 533d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber/* 534d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber filter coefficients (fc = 80 Hz, coeff. b[] is divided by 2) 535d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber const Word16 b[3] = {1899, -3798, 1899}; 536d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber const Word16 a[3] = {4096, 7807, -3733}; 537d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber 538d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber*/ 539d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber 540d49b526dd2009270cb15f7fe4e70b74673950608Andreas Hubervoid Pre_Process( 541d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber Pre_ProcessState *st, 542d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber Word16 signal[], /* input/output signal */ 543d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber Word16 lg) /* length of signal */ 544d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber{ 545d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber register Word16 i; 546d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber Word16 x_n_2; 547d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber Word16 x_n_1; 548d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber Word32 L_tmp; 549d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber Word16 *p_signal = signal; 550d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber 551d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber x_n_2 = st->x1; 552d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber x_n_1 = st->x0; 553d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber 554d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber for (i = lg; i != 0; i--) 555d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber { 556d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber 557d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber 558d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber /* y[i] = b[0]*x[i]/2 + b[1]*x[i-1]/2 + b140[2]*x[i-2]/2 */ 559d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber /* + a[1]*y[i-1] + a[2] * y[i-2]; */ 560d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber 561d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber L_tmp = ((Word32) st->y1_hi) * 7807; 562d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber L_tmp += (Word32)(((Word32) st->y1_lo * 7807) >> 15); 563d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber 564d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber L_tmp += ((Word32) st->y2_hi) * (-3733); 565d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber st->y2_hi = st->y1_hi; 566d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber L_tmp += (Word32)(((Word32) st->y2_lo * (-3733)) >> 15); 567d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber st->y2_lo = st->y1_lo; 568d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber 569d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber L_tmp += ((Word32) x_n_2) * 1899; 570d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber x_n_2 = x_n_1; 571d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber L_tmp += ((Word32) x_n_1) * (-3798); 572d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber x_n_1 = *(p_signal); 573d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber L_tmp += ((Word32) x_n_1) * 1899; 574d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber 575d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber 576d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber *(p_signal++) = (Word16)((L_tmp + 0x0000800L) >> 12); 577d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber 578d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber st->y1_hi = (Word16)(L_tmp >> 12); 579d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber st->y1_lo = (Word16)((L_tmp << 3) - ((Word32)(st->y1_hi) << 15)); 580d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber 581d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber } 582d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber 583d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber st->x1 = x_n_2; 584d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber st->x0 = x_n_1; 585d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber 586d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber return; 587d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber} 588d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber 589d49b526dd2009270cb15f7fe4e70b74673950608Andreas Huber 590