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/d1035pf.c 35 36 Date: 04/14/2000 37 38 ------------------------------------------------------------------------------ 39 REVISION HISTORY 40 41 Description: Updated template used to PV coding template. First attempt at 42 optimizing C code. 43 44 Description: Updated file per comments gathered from Phase 2/3 review. 45 46 Description: Synchronized file with UTMS version 3.2.0. Updated coding 47 template. Removed unnecessary include files. 48 49 Description: Removed inclusion of "gray.tab". 50 51 Description: 52 53 ------------------------------------------------------------------------------ 54 */ 55 56 /*---------------------------------------------------------------------------- 57 ; INCLUDES 58 ----------------------------------------------------------------------------*/ 59 #include "d1035pf.h" 60 #include "typedef.h" 61 #include "basic_op.h" 62 #include "cnst.h" 63 64 /*---------------------------------------------------------------------------- 65 ; MACROS 66 ; Define module specific macros here 67 ----------------------------------------------------------------------------*/ 68 69 /*---------------------------------------------------------------------------- 70 ; DEFINES 71 ; Include all pre-processor statements here. Include conditional 72 ; compile variables also. 73 ----------------------------------------------------------------------------*/ 74 #define NB_PULSE 10 /* number of pulses */ 75 76 /*---------------------------------------------------------------------------- 77 ; LOCAL FUNCTION DEFINITIONS 78 ; Function Prototype declaration 79 ----------------------------------------------------------------------------*/ 80 81 /*---------------------------------------------------------------------------- 82 ; LOCAL STORE/BUFFER/POINTER DEFINITIONS 83 ; Variable declaration - defined here and used outside this module 84 ----------------------------------------------------------------------------*/ 85 86 /* 87 ------------------------------------------------------------------------------ 88 FUNCTION NAME: dec_10i40_35bits 89 ------------------------------------------------------------------------------ 90 INPUT AND OUTPUT DEFINITIONS 91 92 Inputs: 93 index = buffer containing index of 10 pulses; each element is 94 represented by sign+position 95 cod = buffer of algebraic (fixed) codebook excitation 96 97 Outputs: 98 cod buffer contains the new algebraic codebook excitation 99 100 Returns: 101 None 102 103 Global Variables Used: 104 dgray = gray decoding table 105 106 Local Variables Needed: 107 None 108 109 ------------------------------------------------------------------------------ 110 FUNCTION DESCRIPTION 111 112 This function builds the innovative codevector from the received index of 113 algebraic codebook. See c1035pf.c for more details about the algebraic 114 codebook structure. 115 116 ------------------------------------------------------------------------------ 117 REQUIREMENTS 118 119 None 120 121 ------------------------------------------------------------------------------ 122 REFERENCES 123 124 d1035pf.c, UMTS GSM AMR speech codec, R99 - Version 3.2.0, March 2, 2001 125 126 ------------------------------------------------------------------------------ 127 PSEUDO-CODE 128 129 void dec_10i40_35bits ( 130 Word16 index[], // (i) : index of 10 pulses (sign+position) 131 Word16 cod[] // (o) : algebraic (fixed) codebook excitation 132 ) 133 { 134 Word16 i, j, pos1, pos2, sign, tmp; 135 136 for (i = 0; i < L_CODE; i++) 137 { 138 cod[i] = 0; 139 } 140 141 // decode the positions and signs of pulses and build the codeword 142 143 for (j = 0; j < NB_TRACK; j++) 144 { 145 // compute index i 146 147 tmp = index[j]; 148 i = tmp & 7; 149 i = dgray[i]; 150 151 i = extract_l (L_shr (L_mult (i, 5), 1)); 152 pos1 = add (i, j); // position of pulse "j" 153 154 i = shr (tmp, 3) & 1; 155 if (i == 0) 156 { 157 sign = 4096; // +1.0 158 } 159 else 160 { 161 sign = -4096; // -1.0 162 } 163 164 cod[pos1] = sign; 165 166 // compute index i 167 168 i = index[add (j, 5)] & 7; 169 i = dgray[i]; 170 i = extract_l (L_shr (L_mult (i, 5), 1)); 171 172 pos2 = add (i, j); // position of pulse "j+5" 173 174 if (sub (pos2, pos1) < 0) 175 { 176 sign = negate (sign); 177 } 178 cod[pos2] = add (cod[pos2], sign); 179 } 180 181 return; 182 } 183 184 ------------------------------------------------------------------------------ 185 RESOURCES USED [optional] 186 187 When the code is written for a specific target processor the 188 the resources used should be documented below. 189 190 HEAP MEMORY USED: x bytes 191 192 STACK MEMORY USED: x bytes 193 194 CLOCK CYCLES: (cycle count equation for this function) + (variable 195 used to represent cycle count for each subroutine 196 called) 197 where: (cycle count variable) = cycle count for [subroutine 198 name] 199 200 ------------------------------------------------------------------------------ 201 CAUTION [optional] 202 [State any special notes, constraints or cautions for users of this function] 203 204 ------------------------------------------------------------------------------ 205 */ 206 207 void dec_10i40_35bits( 208 Word16 index[], /* (i) : index of 10 pulses (sign+position) */ 209 Word16 cod[] /* (o) : algebraic (fixed) codebook excitation */ 210 ) 211 { 212 register Word16 i, j, pos1, pos2; 213 Word16 sign, tmp; 214 215 for (i = 0; i < L_CODE; i++) 216 { 217 *(cod + i) = 0; 218 } 219 220 /* decode the positions and signs of pulses and build the codeword */ 221 222 for (j = 0; j < NB_TRACK; j++) 223 { 224 /* compute index i */ 225 226 tmp = *(index + j); 227 i = tmp & 7; 228 i = *(dgray + i); 229 230 i = (Word16)(i * 5); 231 pos1 = i + j; /* position of pulse "j" */ 232 233 i = (tmp >> 3) & 1; 234 235 if (i == 0) 236 { 237 sign = 4096; /* +1.0 */ 238 } 239 else 240 { 241 sign = -4096; /* -1.0 */ 242 } 243 244 *(cod + pos1) = sign; 245 246 /* compute index i */ 247 248 i = *(index + j + 5) & 7; 249 i = *(dgray + i); 250 i = (Word16)(i * 5); 251 252 pos2 = i + j; /* position of pulse "j+5" */ 253 254 255 if (pos2 < pos1) 256 { 257 sign = negate(sign); 258 } 259 *(cod + pos2) += sign; 260 } 261 262 return; 263 } 264
