14f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber/* ------------------------------------------------------------------ 24f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber * Copyright (C) 1998-2009 PacketVideo 34f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber * 44f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber * Licensed under the Apache License, Version 2.0 (the "License"); 54f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber * you may not use this file except in compliance with the License. 64f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber * You may obtain a copy of the License at 74f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber * 84f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber * http://www.apache.org/licenses/LICENSE-2.0 94f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber * 104f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber * Unless required by applicable law or agreed to in writing, software 114f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber * distributed under the License is distributed on an "AS IS" BASIS, 124f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either 134f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber * express or implied. 144f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber * See the License for the specific language governing permissions 154f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber * and limitations under the License. 164f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber * ------------------------------------------------------------------- 174f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber */ 184f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber/**************************************************************************************** 194f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas HuberPortions of this file are derived from the following 3GPP standard: 204f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 214f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 3GPP TS 26.073 224f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber ANSI-C code for the Adaptive Multi-Rate (AMR) speech codec 234f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber Available from http://www.3gpp.org 244f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 254f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber(C) 2004, 3GPP Organizational Partners (ARIB, ATIS, CCSA, ETSI, TTA, TTC) 264f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas HuberPermission to distribute, modify and use this file under the standard license 274f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huberterms listed above has been obtained from the copyright holder. 284f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber****************************************************************************************/ 294f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber/* 304f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 314f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber Pathname: ./audio/gsm-amr/c/src/residu.c 324f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 334f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber------------------------------------------------------------------------------ 344f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber REVISION HISTORY 354f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 364f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber Description: Updated template used to PV coding template. First attempt at 374f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber optimizing code. 384f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 394f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber Description: Deleted stores listed in the Local Stores Needed/Modified 404f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber section. 414f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 424f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber Description: Updated file per comments gathered from Phase 2/3 review. 434f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 444f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber Description: Updating to reflect variable name changes made in residu.asm 454f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 464f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber Description: Synchronized file with UMTS version 3.2.0. Updated coding 474f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber template. Removed unnecessary include files. 484f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 494f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber Description: Made the following changes per comments from Phase 2/3 review: 504f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 1. Modified FOR loops to count down. 514f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 2. Fixed typecasting issue with TI C compiler. 524f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 534f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber Description: Made the following changes 544f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 1. Unrolled the convolutional loop. 554f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 2. Performed 4 convolution per pass to avoid recalling the same 564f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber filter coefficient as many times. 574f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 2. Eliminated math operations that check for saturation. 584f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 594f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber Description: Replaced "int" and/or "char" with OSCL defined types. 604f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 614f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber Description: Changed round function name to pv_round to avoid conflict with 624f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber round function in C standard library. 634f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 644f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber Who: Date: 654f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber Description: 664f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 674f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber------------------------------------------------------------------------------ 684f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber*/ 694f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 704f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber/*---------------------------------------------------------------------------- 714f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber; INCLUDES 724f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber----------------------------------------------------------------------------*/ 734f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber#include "residu.h" 744f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber#include "typedef.h" 754f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber#include "cnst.h" 764f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 774f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber/*---------------------------------------------------------------------------- 784f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber; MACROS 794f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber; Define module specific macros here 804f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber----------------------------------------------------------------------------*/ 814f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 824f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber/*---------------------------------------------------------------------------- 834f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber; DEFINES 844f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber; Include all pre-processor statements here. Include conditional 854f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber; compile variables also. 864f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber----------------------------------------------------------------------------*/ 874f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 884f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber/*---------------------------------------------------------------------------- 894f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber; LOCAL FUNCTION DEFINITIONS 904f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber; Function Prototype declaration 914f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber----------------------------------------------------------------------------*/ 924f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 934f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber/*---------------------------------------------------------------------------- 944f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber; LOCAL STORE/BUFFER/POINTER DEFINITIONS 954f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber; Variable declaration - defined here and used outside this module 964f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber----------------------------------------------------------------------------*/ 974f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 984f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 994f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber/* 1004f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber------------------------------------------------------------------------------ 1014f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber FUNCTION NAME: Residu 1024f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber------------------------------------------------------------------------------ 1034f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber INPUT AND OUTPUT DEFINITIONS 1044f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 1054f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber Inputs: 1064f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber coef_ptr = pointer to buffer containing the prediction coefficients 1074f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber input_ptr = pointer to buffer containing the speech signal 1084f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber input_len = filter order 1094f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber residual_ptr = pointer to buffer of residual signal 1104f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 1114f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber Outputs: 1124f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber residual_ptr buffer contains the newly calculated the residual signal 1134f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 1144f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber Returns: 1154f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber None 1164f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 1174f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber Global Variables Used: 1184f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber None 1194f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 1204f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber Local Variables Needed: 1214f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber None 1224f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 1234f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber------------------------------------------------------------------------------ 1244f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber FUNCTION DESCRIPTION 1254f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 1264f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber This function computes the LP residual by filtering the input speech through 1274f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber the LP inverse filter A(z). 1284f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 1294f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber------------------------------------------------------------------------------ 1304f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber REQUIREMENTS 1314f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 1324f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber None 1334f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 1344f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber------------------------------------------------------------------------------ 1354f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber REFERENCES 1364f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 1374f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber residu.c, UMTS GSM AMR speech codec, R99 - Version 3.2.0, March 2, 2001 1384f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 1394f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber------------------------------------------------------------------------------ 1404f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber PSEUDO-CODE 1414f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 1424f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber Note: Input argument names were changed to be more descriptive. Shown below 1434f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber are the original names. Shown below are the name changes: 1444f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber a[] <--> coef_ptr[] 1454f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber x[] <--> input_ptr[] 1464f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber y[] <--> residual_ptr[] 1474f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber lg <--> input_len 1484f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 1494f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 1504f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Hubervoid Residu ( 1514f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber Word16 a[], // (i) : prediction coefficients 1524f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber Word16 x[], // (i) : speech signal 1534f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber Word16 y[], // (o) : residual signal 1544f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber Word16 lg // (i) : size of filtering 1554f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber) 1564f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber{ 1574f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber Word16 i, j; 1584f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber Word32 s; 1594f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 1604f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber for (i = 0; i < lg; i++) 1614f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber { 1624f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber s = L_mult (x[i], a[0]); 1634f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber for (j = 1; j <= M; j++) 1644f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber { 1654f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber s = L_mac (s, a[j], x[i - j]); 1664f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber } 1674f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber s = L_shl (s, 3); 1684f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber y[i] = pv_round (s); 1694f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber } 1704f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber return; 1714f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber} 1724f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 1734f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber------------------------------------------------------------------------------ 1744f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber RESOURCES USED [optional] 1754f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 1764f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber When the code is written for a specific target processor the 1774f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber the resources used should be documented below. 1784f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 1794f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber HEAP MEMORY USED: x bytes 1804f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 1814f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber STACK MEMORY USED: x bytes 1824f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 1834f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber CLOCK CYCLES: (cycle count equation for this function) + (variable 1844f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber used to represent cycle count for each subroutine 1854f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber called) 1864f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber where: (cycle count variable) = cycle count for [subroutine 1874f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber name] 1884f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 1894f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber------------------------------------------------------------------------------ 1904f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber CAUTION [optional] 1914f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber [State any special notes, constraints or cautions for users of this function] 1924f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 1934f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber------------------------------------------------------------------------------ 1944f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber*/ 1954f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 1964f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Hubervoid Residu( 1974f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber Word16 coef_ptr[], /* (i) : prediction coefficients*/ 1984f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber Word16 input_ptr[], /* (i) : speech signal */ 1994f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber Word16 residual_ptr[], /* (o) : residual signal */ 2004f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber Word16 input_len /* (i) : size of filtering */ 2014f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber) 2024f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber{ 2034f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 2044f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 2052d0ac425564ff9882ebaac5267d1a04d4af67d00Bernhard Rosenkränzer Word16 i, j; 2064f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber Word32 s1; 2074f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber Word32 s2; 2084f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber Word32 s3; 2094f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber Word32 s4; 2104f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber Word16 *p_input1; 2114f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber Word16 *p_input2; 2124f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber Word16 *p_input3; 2134f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber Word16 *p_input4; 2144f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber Word16 *p_coef; 2154f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber Word16 *p_residual_ptr = &residual_ptr[input_len-1]; 2164f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber Word16 *p_input_ptr = &input_ptr[input_len-1-M]; 2174f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 2184f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber for (i = input_len >> 2; i != 0; i--) 2194f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber { 2204f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber s1 = 0x0000800L; 2214f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber s2 = 0x0000800L; 2224f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber s3 = 0x0000800L; 2234f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber s4 = 0x0000800L; 2244f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber p_coef = &coef_ptr[M]; 2254f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber p_input1 = p_input_ptr--; 2264f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber p_input2 = p_input_ptr--; 2274f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber p_input3 = p_input_ptr--; 2284f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber p_input4 = p_input_ptr--; 2294f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 2304f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber for (j = M >> 1; j != 0; j--) 2314f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber { 2324f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber s1 += ((Word32) * (p_coef) * *(p_input1++)); 2334f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber s2 += ((Word32) * (p_coef) * *(p_input2++)); 2344f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber s3 += ((Word32) * (p_coef) * *(p_input3++)); 2354f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber s4 += ((Word32) * (p_coef--) * *(p_input4++)); 2364f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber s1 += ((Word32) * (p_coef) * *(p_input1++)); 2374f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber s2 += ((Word32) * (p_coef) * *(p_input2++)); 2384f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber s3 += ((Word32) * (p_coef) * *(p_input3++)); 2394f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber s4 += ((Word32) * (p_coef--) * *(p_input4++)); 2404f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber } 2414f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 2424f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber s1 += (((Word32) * (p_coef)) * *(p_input1)); 2434f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber s2 += (((Word32) * (p_coef)) * *(p_input2)); 2444f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber s3 += (((Word32) * (p_coef)) * *(p_input3)); 2454f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber s4 += (((Word32) * (p_coef)) * *(p_input4)); 2464f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 2474f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber *(p_residual_ptr--) = (Word16)(s1 >> 12); 2484f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber *(p_residual_ptr--) = (Word16)(s2 >> 12); 2494f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber *(p_residual_ptr--) = (Word16)(s3 >> 12); 2504f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber *(p_residual_ptr--) = (Word16)(s4 >> 12); 2514f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 2524f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber } 2534f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber 2544f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber return; 2554f1efc098cb5791c3e9f483f2af84aef70d2d0a0Andreas Huber} 256