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 Filename: /audio/gsm_amr/c/src/g_code.c 35b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber 36b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber Date: 01/31/2002 37b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber 38b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber------------------------------------------------------------------------------ 39b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber REVISION HISTORY 40b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber 41b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber Description: The return of L_mult was being stored in a Word16 before it was 42b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber being operated on (extract_h). Data loss happened here. 43b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber 44b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber Description: 45b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber 1. Eliminated unused include files. 46b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber 2. Replaced array addressing by pointers 47b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber 3. Eliminated math operations that unnecessary checked for 48b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber saturation, in some cases this by shifting before adding and 49b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber in other cases by evaluating the operands 50b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber 4. Unrolled loops to speed up processing 51b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber 5. Eliminated calls to shifts left and right functions by adding 52b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber if-else statements that do the same faster. 53b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber 54b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber Description: Added casting to eliminate warnings 55b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber 56b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber Description: Replaced "int" and/or "char" with OSCL defined types. 57b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber 58b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber Description: 1. Using inlines from fxp_arithmetic.h 59b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber 2. Removing a compiler warning. 60b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber 61b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber Description: Replacing fxp_arithmetic.h with basic_op.h. 62b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber 63b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber Description: 64b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber 65b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber------------------------------------------------------------------------------ 66b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber*/ 67b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber 68b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber/*---------------------------------------------------------------------------- 69b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber; INCLUDES 70b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber----------------------------------------------------------------------------*/ 71b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber#include "g_code.h" 72b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber#include "cnst.h" 73b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber#include "basic_op.h" 74b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber/*---------------------------------------------------------------------------- 75b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber; MACROS 76b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber; [Define module specific macros here] 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 85b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber/*---------------------------------------------------------------------------- 86b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber; LOCAL FUNCTION DEFINITIONS 87b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber; [List function prototypes here] 88b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber----------------------------------------------------------------------------*/ 89b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber 90b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber/*---------------------------------------------------------------------------- 91b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber; LOCAL VARIABLE DEFINITIONS 92b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber; [Variable declaration - defined here and used outside this module] 93b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber----------------------------------------------------------------------------*/ 94b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber 95b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber/* 96b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber------------------------------------------------------------------------------ 97b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber FUNCTION NAME: G_code 98b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber------------------------------------------------------------------------------ 99b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber INPUT AND OUTPUT DEFINITIONS 100b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber 101b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber Inputs: 102b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber xn2[] = target vector (Word16) 103b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber y2[] = filtered innovation vector 104b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber pOverflow = pointer to overflow (Flag) 105b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber 106b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber Outputs: 107b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber pOverflow -> 1 if the innovative gain calculation resulted in overflow 108b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber 109b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber Returns: 110b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber gain = Gain of Innovation code (Word16) 111b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber 112b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber Global Variables Used: 113b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber None 114b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber 115b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber Local Variables Needed: 116b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber None 117b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber 118b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber------------------------------------------------------------------------------ 119b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber FUNCTION DESCRIPTION 120b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber 121b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber This function computes the innovative codebook gain. 122b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber 123b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber The innovative codebook gain is given by 124b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber g = <x[], y[]> / <y[], y[]> 125b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber 126b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber where x[] is the target vector, y[] is the filtered innovative codevector, 127b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber and <> denotes dot product. 128b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber 129b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber------------------------------------------------------------------------------ 130b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber REQUIREMENTS 131b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber 132b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber None 133b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber 134b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber------------------------------------------------------------------------------ 135b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber REFERENCES 136b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber 137b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber [1] g_code.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 HuberWord16 G_code ( // out : Gain of innovation code 143b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber Word16 xn2[], // in : target vector 144b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber Word16 y2[] // in : filtered innovation vector 145b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber) 146b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber{ 147b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber Word16 i; 148b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber Word16 xy, yy, exp_xy, exp_yy, gain; 149b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber Word16 scal_y2[L_SUBFR]; 150b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber Word32 s; 151b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber 152b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber// The original ETSI implementation uses a global overflow flag. However in 153b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber// actual implementation a pointer to Overflow flag is passed into the 154b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber// function for access by the low level math functions. 155b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber 156b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber // Scale down Y[] by 2 to avoid overflow 157b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber 158b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber for (i = 0; i < L_SUBFR; i++) 159b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber { 160b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber scal_y2[i] = shr (y2[i], 1); 161b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber } 162b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber 163b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber // Compute scalar product <X[],Y[]> 164b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber 165b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber s = 1L; // Avoid case of all zeros 166b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber for (i = 0; i < L_SUBFR; i++) 167b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber { 168b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber s = L_mac (s, xn2[i], scal_y2[i]); 169b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber } 170b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber exp_xy = norm_l (s); 171b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber xy = extract_h (L_shl (s, exp_xy)); 172b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber 173b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber // If (xy < 0) gain = 0 174b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber 175b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber if (xy <= 0) 176b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber return ((Word16) 0); 177b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber 178b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber // Compute scalar product <Y[],Y[]> 179b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber 180b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber s = 0L; 181b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber for (i = 0; i < L_SUBFR; i++) 182b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber { 183b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber s = L_mac (s, scal_y2[i], scal_y2[i]); 184b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber } 185b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber exp_yy = norm_l (s); 186b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber yy = extract_h (L_shl (s, exp_yy)); 187b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber 188b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber // compute gain = xy/yy 189b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber 190b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber xy = shr (xy, 1); // Be sure xy < yy 191b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber gain = div_s (xy, yy); 192b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber 193b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber // Denormalization of division 194b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber i = add (exp_xy, 5); // 15-1+9-18 = 5 195b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber i = sub (i, exp_yy); 196b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber 197b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber gain = shl (shr (gain, i), 1); // Q0 -> Q1/ 198b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber 199b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber return (gain); 200b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber} 201b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber 202b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber 203b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber------------------------------------------------------------------------------ 204b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber RESOURCES USED [optional] 205b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber 206b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber When the code is written for a specific target processor the 207b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber the resources used should be documented below. 208b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber 209b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber HEAP MEMORY USED: x bytes 210b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber 211b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber STACK MEMORY USED: x bytes 212b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber 213b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber CLOCK CYCLES: (cycle count equation for this function) + (variable 214b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber used to represent cycle count for each subroutine 215b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber called) 216b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber where: (cycle count variable) = cycle count for [subroutine 217b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber name] 218b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber 219b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber------------------------------------------------------------------------------ 220b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber CAUTION [optional] 221b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber [State any special notes, constraints or cautions for users of this function] 222b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber 223b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber------------------------------------------------------------------------------ 224b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber*/ 225b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber 226b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber/*---------------------------------------------------------------------------- 227b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber; FUNCTION CODE 228b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber----------------------------------------------------------------------------*/ 229b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas HuberWord16 G_code( /* o : Gain of innovation code */ 230b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber Word16 xn2[], /* i : target vector */ 231b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber Word16 y2[], /* i : filtered innovation vector */ 232b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber Flag *pOverflow /* i/o : overflow flag */ 233b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber) 234b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber{ 235b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber Word16 i; 236b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber Word16 xy, yy, exp_xy, exp_yy, gain; 237b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber Word32 s; 238b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber 239b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber Word16 *p_xn2 = xn2; 240b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber Word16 *p_y2 = y2; 241b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber Word16 temp; 242b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber Word32 temp2; 243b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber 244b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber OSCL_UNUSED_ARG(pOverflow); 245b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber 246b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber /* Compute scalar product <X[],Y[]> */ 247b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber s = 0; 248b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber 249b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber for (i = (L_SUBFR >> 2); i != 0 ; i--) 250b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber { 251b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber temp2 = (Word32)(*(p_y2++) >> 1); 252b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber s = amrnb_fxp_mac_16_by_16bb((Word32) * (p_xn2++), temp2, s); 253b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber temp2 = (Word32)(*(p_y2++) >> 1); 254b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber s = amrnb_fxp_mac_16_by_16bb((Word32) * (p_xn2++), temp2, s); 255b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber temp2 = (Word32)(*(p_y2++) >> 1); 256b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber s = amrnb_fxp_mac_16_by_16bb((Word32) * (p_xn2++), temp2, s); 257b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber temp2 = (Word32)(*(p_y2++) >> 1); 258b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber s = amrnb_fxp_mac_16_by_16bb((Word32) * (p_xn2++), temp2, s); 259b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber } 260b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber s <<= 1; 261b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber exp_xy = norm_l(s + 1); /* Avoid case of all zeros, add 1 */ 262b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber 263b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber if (exp_xy < 17) /* extra right shift to be sure xy < yy */ 264b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber { 265b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber xy = (Word16)(s >> (17 - exp_xy)); 266b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber } 267b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber else 268b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber { 269b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber xy = (Word16)(s << (exp_xy - 17)); 270b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber } 271b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber 272b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber /* If (xy < 0) gain = 0 */ 273b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber 274b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber if (xy <= 0) 275b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber { 276b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber return ((Word16) 0); 277b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber } 278b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber 279b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber /* Compute scalar product <Y[],Y[]> */ 280b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber 281b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber s = 0L; 282b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber p_y2 = y2; 283b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber 284b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber for (i = (L_SUBFR >> 1); i != 0 ; i--) 285b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber { 286b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber temp = *(p_y2++) >> 1; 287b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber s += ((Word32) temp * temp) >> 2; 288b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber temp = *(p_y2++) >> 1; 289b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber s += ((Word32) temp * temp) >> 2; 290b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber } 291b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber s <<= 3; 292b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber exp_yy = norm_l(s); 293b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber 294b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber if (exp_yy < 16) 295b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber { 296b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber yy = (Word16)(s >> (16 - exp_yy)); 297b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber } 298b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber else 299b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber { 300b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber yy = (Word16)(s << (exp_yy - 16)); 301b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber } 302b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber 303b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber gain = div_s(xy, yy); 304b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber 305b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber /* Denormalization of division */ 306b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber i = exp_xy + 5; /* 15-1+9-18 = 5 */ 307b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber i -= exp_yy; 308b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber 309b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber // gain = shl (shr (gain, i), 1); /* Q0 -> Q1 */ 310b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber 311b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber if (i > 1) 312b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber { 313b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber gain >>= i - 1; 314b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber } 315b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber else 316b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber { 317b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber gain <<= 1 - i; 318b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber } 319b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber 320b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber 321b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber return (gain); 322b841f14f8e51f2365945281fbfa54ef6a1b1b5a6Andreas Huber} 323