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 26.173 22 ANSI-C code for the Adaptive Multi-Rate - Wideband (AMR-WB) speech codec 23 Available from http://www.3gpp.org 24 25 (C) 2007, 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 Filename: dec_acelp_4p_in_64.cpp 35 36 Date: 05/08/2007 37 38 ------------------------------------------------------------------------------ 39 REVISION HISTORY 40 41 42 Description: 43 44 ------------------------------------------------------------------------------ 45 INPUT AND OUTPUT DEFINITIONS 46 47 int16 index[], (i) : index (20): 5+5+5+5 = 20 bits. 48 (i) : index (36): 9+9+9+9 = 36 bits. 49 (i) : index (44): 13+9+13+9 = 44 bits. 50 (i) : index (52): 13+13+13+13 = 52 bits. 51 (i) : index (64): 2+2+2+2+14+14+14+14 = 64 bits. 52 (i) : index (72): 10+2+10+2+10+14+10+14 = 72 bits. 53 (i) : index (88): 11+11+11+11+11+11+11+11 = 88 bits. 54 int16 nbbits, (i) : 20, 36, 44, 52, 64, 72 or 88 bits 55 int16 code[] (o) Q9: algebraic (fixed) codebook excitation 56 57 ------------------------------------------------------------------------------ 58 FUNCTION DESCRIPTION 59 60 20, 36, 44, 52, 64, 72, 88 bits algebraic codebook decoder. 61 4 tracks x 16 positions per track = 64 samples. 62 63 20 bits --> 4 pulses in a frame of 64 samples. 64 36 bits --> 8 pulses in a frame of 64 samples. 65 44 bits --> 10 pulses in a frame of 64 samples. 66 52 bits --> 12 pulses in a frame of 64 samples. 67 64 bits --> 16 pulses in a frame of 64 samples. 68 72 bits --> 18 pulses in a frame of 64 samples. 69 88 bits --> 24 pulses in a frame of 64 samples. 70 71 All pulses can have two (2) possible amplitudes: +1 or -1. 72 Each pulse can have sixteen (16) possible positions. 73 74 ------------------------------------------------------------------------------ 75 REQUIREMENTS 76 77 78 ------------------------------------------------------------------------------ 79 REFERENCES 80 81 ------------------------------------------------------------------------------ 82 PSEUDO-CODE 83 84 ------------------------------------------------------------------------------ 85 */ 86 87 88 /*---------------------------------------------------------------------------- 89 ; INCLUDES 90 ----------------------------------------------------------------------------*/ 91 92 #include "pv_amr_wb_type_defs.h" 93 #include "pvamrwbdecoder_basic_op.h" 94 #include "pvamrwbdecoder_cnst.h" 95 #include "pvamrwbdecoder_acelp.h" 96 97 #include "q_pulse.h" 98 99 /*---------------------------------------------------------------------------- 100 ; MACROS 101 ; Define module specific macros here 102 ----------------------------------------------------------------------------*/ 103 104 105 /*---------------------------------------------------------------------------- 106 ; DEFINES 107 ; Include all pre-processor statements here. Include conditional 108 ; compile variables also. 109 ----------------------------------------------------------------------------*/ 110 #define L_CODE 64 /* codevector length */ 111 #define NB_TRACK 4 /* number of track */ 112 #define NB_POS 16 /* number of position */ 113 114 /*---------------------------------------------------------------------------- 115 ; LOCAL FUNCTION DEFINITIONS 116 ; Function Prototype declaration 117 ----------------------------------------------------------------------------*/ 118 #ifdef __cplusplus 119 extern "C" 120 { 121 #endif 122 123 void add_pulses(int16 pos[], int16 nb_pulse, int16 track, int16 code[]); 124 125 #ifdef __cplusplus 126 } 127 #endif 128 129 /*---------------------------------------------------------------------------- 130 ; LOCAL STORE/BUFFER/POINTER DEFINITIONS 131 ; Variable declaration - defined here and used outside this module 132 ----------------------------------------------------------------------------*/ 133 134 /*---------------------------------------------------------------------------- 135 ; EXTERNAL FUNCTION REFERENCES 136 ; Declare functions defined elsewhere and referenced in this module 137 ----------------------------------------------------------------------------*/ 138 139 /*---------------------------------------------------------------------------- 140 ; EXTERNAL GLOBAL STORE/BUFFER/POINTER REFERENCES 141 ; Declare variables used in this module but defined elsewhere 142 ----------------------------------------------------------------------------*/ 143 144 /*---------------------------------------------------------------------------- 145 ; FUNCTION CODE 146 ----------------------------------------------------------------------------*/ 147 148 void dec_acelp_4p_in_64( 149 int16 index[], /* (i) : index (20): 5+5+5+5 = 20 bits. */ 150 /* (i) : index (36): 9+9+9+9 = 36 bits. */ 151 /* (i) : index (44): 13+9+13+9 = 44 bits. */ 152 /* (i) : index (52): 13+13+13+13 = 52 bits. */ 153 /* (i) : index (64): 2+2+2+2+14+14+14+14 = 64 bits. */ 154 /* (i) : index (72): 10+2+10+2+10+14+10+14 = 72 bits. */ 155 /* (i) : index (88): 11+11+11+11+11+11+11+11 = 88 bits. */ 156 int16 nbbits, /* (i) : 20, 36, 44, 52, 64, 72 or 88 bits */ 157 int16 code[] /* (o) Q9: algebraic (fixed) codebook excitation */ 158 ) 159 { 160 int16 k, pos[6]; 161 int32 L_index; 162 pv_memset(code, 0, L_CODE*sizeof(*code)); 163 164 /* decode the positions and signs of pulses and build the codeword */ 165 166 167 switch (nbbits) 168 { 169 case 20: 170 for (k = 0; k < NB_TRACK; k++) 171 { 172 L_index = index[k]; 173 dec_1p_N1(L_index, 4, 0, pos); 174 add_pulses(pos, 1, k, code); 175 } 176 break; 177 178 case 36: 179 for (k = 0; k < NB_TRACK; k++) 180 { 181 L_index = index[k]; 182 dec_2p_2N1(L_index, 4, 0, pos); 183 add_pulses(pos, 2, k, code); 184 } 185 break; 186 case 44: 187 for (k = 0; k < NB_TRACK - 2; k++) 188 { 189 L_index = index[k]; 190 dec_3p_3N1(L_index, 4, 0, pos); 191 add_pulses(pos, 3, k, code); 192 } 193 for (k = 2; k < NB_TRACK; k++) 194 { 195 L_index = index[k]; 196 dec_2p_2N1(L_index, 4, 0, pos); 197 add_pulses(pos, 2, k, code); 198 } 199 break; 200 case 52: 201 for (k = 0; k < NB_TRACK; k++) 202 { 203 L_index = index[k]; 204 dec_3p_3N1(L_index, 4, 0, pos); 205 add_pulses(pos, 3, k, code); 206 } 207 break; 208 case 64: 209 for (k = 0; k < NB_TRACK; k++) 210 { 211 L_index = ((int32)index[k] << 14) + index[k + NB_TRACK]; 212 dec_4p_4N(L_index, 4, 0, pos); 213 add_pulses(pos, 4, k, code); 214 } 215 break; 216 case 72: 217 for (k = 0; k < NB_TRACK - 2; k++) 218 { 219 L_index = ((int32)index[k] << 10) + index[k + NB_TRACK]; 220 dec_5p_5N(L_index, 4, 0, pos); 221 add_pulses(pos, 5, k, code); 222 } 223 for (k = 2; k < NB_TRACK; k++) 224 { 225 L_index = ((int32)index[k] << 14) + index[k + NB_TRACK]; 226 dec_4p_4N(L_index, 4, 0, pos); 227 add_pulses(pos, 4, k, code); 228 } 229 break; 230 case 88: 231 for (k = 0; k < NB_TRACK; k++) 232 { 233 L_index = ((int32)index[k] << 11) + index[k + NB_TRACK]; 234 dec_6p_6N_2(L_index, 4, 0, pos); 235 add_pulses(pos, 6, k, code); 236 } 237 default: 238 break; 239 } 240 241 242 } 243 244 245 246 void add_pulses(int16 pos[], int16 nb_pulse, int16 track, int16 code[]) 247 { 248 int16 i, k; 249 250 for (k = 0; k < nb_pulse; k++) 251 { 252 /* i = ((pos[k] & (NB_POS-1))*NB_TRACK) + track; */ 253 i = ((pos[k] & (NB_POS - 1)) << 2) + track; 254 255 if ((pos[k] & NB_POS) == 0) 256 { 257 code[i] += 512; 258 } 259 else 260 { 261 code[i] -= 512; 262 } 263 } 264 265 } 266
