1b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber/* ------------------------------------------------------------------ 2b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber * Copyright (C) 1998-2009 PacketVideo 3b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber * 4b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber * Licensed under the Apache License, Version 2.0 (the "License"); 5b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber * you may not use this file except in compliance with the License. 6b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber * You may obtain a copy of the License at 7b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber * 8b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber * http://www.apache.org/licenses/LICENSE-2.0 9b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber * 10b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber * Unless required by applicable law or agreed to in writing, software 11b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber * distributed under the License is distributed on an "AS IS" BASIS, 12b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either 13b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber * express or implied. 14b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber * See the License for the specific language governing permissions 15b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber * and limitations under the License. 16b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber * ------------------------------------------------------------------- 17b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber */ 18b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber/**************************************************************************************** 19b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas HuberPortions of this file are derived from the following 3GPP standard: 20b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber 21b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber 3GPP TS 26.073 22b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber ANSI-C code for the Adaptive Multi-Rate (AMR) speech codec 23b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber Available from http://www.3gpp.org 24b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber 25b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber(C) 2004, 3GPP Organizational Partners (ARIB, ATIS, CCSA, ETSI, TTA, TTC) 26b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas HuberPermission to distribute, modify and use this file under the standard license 27b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huberterms listed above has been obtained from the copyright holder. 28b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber****************************************************************************************/ 29b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber/* 30b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber------------------------------------------------------------------------------ 31b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber 32b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber 33b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber 34b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber Pathname: ./audio/gsm-amr/c/src/inter_36.c 35b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber 36b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber Date: 01/31/2002 37b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber 38b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber------------------------------------------------------------------------------ 39b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber REVISION HISTORY 40b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber 41b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber Description: 42b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber 1. Eliminated unused include files. 43b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber 2. Replaced array addressing by pointers 44b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber 3. Eliminated math operations that unnecessary checked for 45b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber saturation 46b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber 4. Unrolled loops to speed up processing, use decrement loops 47b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber 5. Eliminated call to round by proper initialization 48b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber 49b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber Description: Added casting to eliminate warnings 50b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber 51b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber Description: Replaced "int" and/or "char" with OSCL defined types. 52b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber 53b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber Description: Changed round function name to pv_round to avoid conflict with 54b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber round function in C standard library. 55b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber 56b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber Description: Using intrinsics from fxp_arithmetic.h . 57b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber 58b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber Description: Replacing fxp_arithmetic.h with basic_op.h. 59b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber 60b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber Description: 61b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber 62b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber------------------------------------------------------------------------------ 63b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber*/ 64b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber 65b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber/*---------------------------------------------------------------------------- 66b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber; INCLUDES 67b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber----------------------------------------------------------------------------*/ 68b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber#include "inter_36.h" 69b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber#include "cnst.h" 70b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber#include "inter_36_tab.h" 71b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber#include "basic_op.h" 72b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber 73b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber/*---------------------------------------------------------------------------- 74b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber; MACROS 75b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber; Define module specific macros here 76b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber----------------------------------------------------------------------------*/ 77b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber 78b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber 79b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber/*---------------------------------------------------------------------------- 80b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber; DEFINES 81b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber; Include all pre-processor statements here. Include conditional 82b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber; compile variables also. 83b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber----------------------------------------------------------------------------*/ 84b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber#define UP_SAMP_MAX 6 85b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber 86b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber/*---------------------------------------------------------------------------- 87b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber; LOCAL FUNCTION DEFINITIONS 88b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber; Function Prototype declaration 89b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber----------------------------------------------------------------------------*/ 90b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber 91b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber 92b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber/*---------------------------------------------------------------------------- 93b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber; LOCAL STORE/BUFFER/POINTER DEFINITIONS 94b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber; Variable declaration - defined here and used outside this module 95b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber----------------------------------------------------------------------------*/ 96b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber 97b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber 98b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber/* 99b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber------------------------------------------------------------------------------ 100b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber FUNCTION NAME: inter_36 101b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber------------------------------------------------------------------------------ 102b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber INPUT AND OUTPUT DEFINITIONS 103b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber 104b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber Inputs: 105b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber pX = pointer to input vector of type Word16 106b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber frac = fraction (-2..2 for 3*, -3..3 for 6*) of type Word16 107b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber flag3 = if set, upsampling rate = 3 (6 otherwise) of type Word16 108b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber pOverflow = pointer to overflow flag 109b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber 110b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber Outputs: 111b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber None 112b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber 113b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber Returns: 114b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber None 115b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber 116b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber Global Variables Used: 117b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber None. 118b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber 119b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber Local Variables Needed: 120b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber None. 121b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber 122b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber------------------------------------------------------------------------------ 123b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber FUNCTION DESCRIPTION 124b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber 125b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber File : inter_36.c 126b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber Purpose : Interpolating the normalized correlation 127b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber : with 1/3 or 1/6 resolution. 128b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber 129b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber------------------------------------------------------------------------------ 130b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber REQUIREMENTS 131b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber 132b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber None. 133b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber 134b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber------------------------------------------------------------------------------ 135b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber REFERENCES 136b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber 137b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber inter_36.c, UMTS GSM AMR speech codec, R99 - Version 3.2.0, March 2, 2001 138b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber 139b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber------------------------------------------------------------------------------ 140b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber PSEUDO-CODE 141b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber 142b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber Word16 i, k; 143b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber Word16 *x1, *x2; 144b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber const Word16 *c1, *c2; 145b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber Word32 s; 146b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber 147b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber if (flag3 != 0) 148b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber { 149b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber frac = shl (frac, 1); // inter_3[k] = inter_6[2*k] -> k' = 2*k 150b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber } 151b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber 152b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber if (frac < 0) 153b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber { 154b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber frac = add (frac, UP_SAMP_MAX); 155b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber x--; 156b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber } 157b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber 158b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber x1 = &x[0]; 159b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber x2 = &x[1]; 160b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber c1 = &inter_6[frac]; 161b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber c2 = &inter_6[sub (UP_SAMP_MAX, frac)]; 162b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber 163b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber s = 0; 164b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber for (i = 0, k = 0; i < L_INTER_SRCH; i++, k += UP_SAMP_MAX) 165b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber { 166b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber s = L_mac (s, x1[-i], c1[k]); 167b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber s = L_mac (s, x2[i], c2[k]); 168b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber } 169b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber 170b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber return pv_round (s); 171b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber 172b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber------------------------------------------------------------------------------ 173b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber RESOURCES USED [optional] 174b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber 175b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber When the code is written for a specific target processor the 176b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber the resources used should be documented below. 177b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber 178b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber HEAP MEMORY USED: x bytes 179b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber 180b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber STACK MEMORY USED: x bytes 181b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber 182b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber CLOCK CYCLES: (cycle count equation for this function) + (variable 183b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber used to represent cycle count for each subroutine 184b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber called) 185b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber where: (cycle count variable) = cycle count for [subroutine 186b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber name] 187b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber 188b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber------------------------------------------------------------------------------ 189b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber CAUTION [optional] 190b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber [State any special notes, constraints or cautions for users of this function] 191b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber 192b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber------------------------------------------------------------------------------ 193b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber*/ 194b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas HuberWord16 Interpol_3or6( /* o : interpolated value */ 195b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber Word16 *pX, /* i : input vector */ 196b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber Word16 frac, /* i : fraction (-2..2 for 3*, -3..3 for 6*) */ 197b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber Word16 flag3, /* i : if set, upsampling rate = 3 (6 otherwise) */ 198b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber Flag *pOverflow 199b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber) 200b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber{ 201b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber Word16 i; 202b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber Word16 k; 203b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber Word16 *pX1; 204b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber Word16 *pX2; 205b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber const Word16 *pC1; 206b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber const Word16 *pC2; 207b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber Word32 s; 208b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber Word16 temp1; 209b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber 210b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber OSCL_UNUSED_ARG(pOverflow); 211b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber 212b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber if (flag3 != 0) 213b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber { 214b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber frac <<= 1; 215b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber /* inter_3[k] = inter_6[2*k] -> k' = 2*k */ 216b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber } 217b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber 218b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber if (frac < 0) 219b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber { 220b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber frac += UP_SAMP_MAX; 221b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber pX--; 222b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber } 223b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber 224b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber pX1 = &pX[0]; 225b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber pX2 = &pX[1]; 226b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber pC1 = &inter_6[frac]; 227b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber temp1 = UP_SAMP_MAX - frac; 228b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber pC2 = &inter_6[temp1]; 229b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber 230b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber s = 0x04000; 231b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber k = 0; 232b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber 233b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber for (i = (L_INTER_SRCH >> 1); i != 0; i--) 234b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber { 235b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber s = amrnb_fxp_mac_16_by_16bb((Word32) * (pX1--), (Word32) pC1[k], s); 236b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber s = amrnb_fxp_mac_16_by_16bb((Word32) * (pX2++), (Word32) pC2[k], s); 237b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber k += UP_SAMP_MAX; 238b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber s = amrnb_fxp_mac_16_by_16bb((Word32) * (pX1--), (Word32) pC1[k], s); 239b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber s = amrnb_fxp_mac_16_by_16bb((Word32) * (pX2++), (Word32) pC2[k], s); 240b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber k <<= 1; 241b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber } 242b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber 243b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber return((Word16)(s >> 15)); 244b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber} 245b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber 246b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber 247b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber 248b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber 249b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber 250b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber 251