1 /* ------------------------------------------------------------------ 2 * Copyright (C) 1998-2009 PacketVideo 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either 13 * express or implied. 14 * See the License for the specific language governing permissions 15 * and limitations under the License. 16 * ------------------------------------------------------------------- 17 */ 18 /**************************************************************************************** 19 Portions of this file are derived from the following 3GPP standard: 20 21 3GPP TS 26.073 22 ANSI-C code for the Adaptive Multi-Rate (AMR) speech codec 23 Available from http://www.3gpp.org 24 25 (C) 2004, 3GPP Organizational Partners (ARIB, ATIS, CCSA, ETSI, TTA, TTC) 26 Permission to distribute, modify and use this file under the standard license 27 terms listed above has been obtained from the copyright holder. 28 ****************************************************************************************/ 29 /* 30 ------------------------------------------------------------------------------ 31 32 33 34 Pathname: ./audio/gsm-amr/c/src/pre_big.c 35 Functions: 36 37 Date: 02/04/2002 38 39 ------------------------------------------------------------------------------ 40 REVISION HISTORY 41 42 Description: Updated template used to PV coding template. 43 Changed to accept the pOverflow flag for EPOC compatibility. 44 45 Description: Replaced "int" and/or "char" with OSCL defined types. 46 47 Description: 48 49 ------------------------------------------------------------------------------ 50 MODULE DESCRIPTION 51 52 Big subframe (2 subframes) preprocessing 53 ------------------------------------------------------------------------------ 54 */ 55 56 /*---------------------------------------------------------------------------- 57 ; INCLUDES 58 ----------------------------------------------------------------------------*/ 59 #include "pre_big.h" 60 #include "typedef.h" 61 #include "basic_op.h" 62 #include "syn_filt.h" 63 #include "weight_a.h" 64 #include "residu.h" 65 #include "cnst.h" 66 67 /*---------------------------------------------------------------------------- 68 ; MACROS 69 ; Define module specific macros here 70 ----------------------------------------------------------------------------*/ 71 72 /*---------------------------------------------------------------------------- 73 ; DEFINES 74 ; Include all pre-processor statements here. Include conditional 75 ; compile variables also. 76 ----------------------------------------------------------------------------*/ 77 78 /*---------------------------------------------------------------------------- 79 ; LOCAL FUNCTION DEFINITIONS 80 ; Function Prototype declaration 81 ----------------------------------------------------------------------------*/ 82 83 /*---------------------------------------------------------------------------- 84 ; LOCAL VARIABLE DEFINITIONS 85 ; Variable declaration - defined here and used outside this module 86 ----------------------------------------------------------------------------*/ 87 88 /* 89 ------------------------------------------------------------------------------ 90 FUNCTION NAME: pre_big 91 ------------------------------------------------------------------------------ 92 INPUT AND OUTPUT DEFINITIONS 93 94 Inputs: 95 mode = enum Mode -- coder mode 96 gamma1 = array of type const Word16 -- spectral exp. factor 1 97 gamma1_12k2 = array of type const Word16 -- spectral exp. factor 1 for EFR 98 gamma2 = array of type const Word16 -- spectral exp. factor 2 99 A_t = array of type Word16 -- A(z) unquantized, for 4 subframes, Q12 100 frameOffset = Word16 -- Start position in speech vector, Q0 101 speech[] = array of type Word16 -- speech, Q0 102 103 Outputs: 104 mem_w = array of type Word16 -- synthesis filter memory state, Q0 105 wsp = array of type Word16 -- weighted speech Q0 106 pOverflow = pointer of type Flag -- overflow indicator 107 108 Returns: 109 None 110 111 Global Variables Used: 112 None 113 114 Local Variables Needed: 115 None 116 117 ------------------------------------------------------------------------------ 118 FUNCTION DESCRIPTION 119 120 121 ------------------------------------------------------------------------------ 122 REQUIREMENTS 123 124 None 125 126 ------------------------------------------------------------------------------ 127 REFERENCES 128 129 pre_big.c, UMTS GSM AMR speech codec, R99 - Version 3.2.0, March 2, 2001 130 131 ------------------------------------------------------------------------------ 132 PSEUDO-CODE 133 134 135 ------------------------------------------------------------------------------ 136 RESOURCES USED [optional] 137 138 When the code is written for a specific target processor the 139 the resources used should be documented below. 140 141 HEAP MEMORY USED: x bytes 142 143 STACK MEMORY USED: x bytes 144 145 CLOCK CYCLES: (cycle count equation for this function) + (variable 146 used to represent cycle count for each subroutine 147 called) 148 where: (cycle count variable) = cycle count for [subroutine 149 name] 150 151 ------------------------------------------------------------------------------ 152 CAUTION [optional] 153 [State any special notes, constraints or cautions for users of this function] 154 155 ------------------------------------------------------------------------------ 156 */ 157 158 void pre_big( 159 enum Mode mode, /* i : coder mode */ 160 const Word16 gamma1[], /* i : spectral exp. factor 1 */ 161 const Word16 gamma1_12k2[],/* i : spectral exp. factor 1 for EFR */ 162 const Word16 gamma2[], /* i : spectral exp. factor 2 */ 163 Word16 A_t[], /* i : A(z) unquantized, for 4 subframes, Q12 */ 164 Word16 frameOffset, /* i : Start position in speech vector, Q0 */ 165 Word16 speech[], /* i : speech, Q0 */ 166 Word16 mem_w[], /* i/o: synthesis filter memory state, Q0 */ 167 Word16 wsp[], /* o : weighted speech Q0 */ 168 Flag *pOverflow /* o : overflow indicator */ 169 ) 170 { 171 Word16 Ap1[MP1]; /* A(z) with spectral expansion */ 172 Word16 Ap2[MP1]; /* A(z) with spectral expansion */ 173 const Word16 *g1; /* Pointer to correct gammma1 vector */ 174 Word16 aOffset; 175 Word16 i; 176 177 if (mode <= MR795) 178 { 179 g1 = gamma1; 180 } 181 else 182 { 183 g1 = gamma1_12k2; 184 } 185 186 if (frameOffset > 0) 187 { 188 aOffset = 2 * MP1; 189 } 190 else 191 { 192 aOffset = 0; 193 } 194 195 /* process two subframes (which form the "big" subframe) */ 196 for (i = 0; i < 2; i++) 197 { 198 Weight_Ai(&A_t[aOffset], g1, Ap1); 199 Weight_Ai(&A_t[aOffset], gamma2, Ap2); 200 Residu(Ap1, &speech[frameOffset], &wsp[frameOffset], L_SUBFR); 201 202 Syn_filt(Ap2, &wsp[frameOffset], &wsp[frameOffset], L_SUBFR, mem_w, 1); 203 204 aOffset = add(aOffset, MP1, pOverflow); 205 206 frameOffset = add(frameOffset, L_SUBFR, pOverflow); 207 } 208 209 return; 210 } 211
