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/ol_ltp.c 35 Funtions: ol_ltp 36 37 Date: 04/18/2000 38 39 ------------------------------------------------------------------------------ 40 REVISION HISTORY 41 42 Description: Adding pOverflow to the functions to remove global variables. 43 These changes are needed for the EPOC releases. Cleaned up code. 44 Updated template. 45 46 Description: Replaced "int" and/or "char" with OSCL defined types. 47 48 Description: 49 50 ------------------------------------------------------------------------------ 51 */ 52 53 /*---------------------------------------------------------------------------- 54 ; INCLUDES 55 ----------------------------------------------------------------------------*/ 56 #include "ol_ltp.h" 57 #include "cnst.h" 58 #include "pitch_ol.h" 59 #include "p_ol_wgh.h" 60 61 /*---------------------------------------------------------------------------- 62 ; MACROS 63 ; Define module specific macros here 64 ----------------------------------------------------------------------------*/ 65 66 /*---------------------------------------------------------------------------- 67 ; DEFINES 68 ; Include all pre-processor statements here. Include conditional 69 ; compile variables also. 70 ----------------------------------------------------------------------------*/ 71 72 /*---------------------------------------------------------------------------- 73 ; LOCAL FUNCTION DEFINITIONS 74 ; Function Prototype declaration 75 ----------------------------------------------------------------------------*/ 76 77 /*---------------------------------------------------------------------------- 78 ; LOCAL VARIABLE DEFINITIONS 79 ; Variable declaration - defined here and used outside this module 80 ----------------------------------------------------------------------------*/ 81 82 /* 83 ------------------------------------------------------------------------------ 84 FUNCTION NAME: ol_ltp 85 ------------------------------------------------------------------------------ 86 INPUT AND OUTPUT DEFINITIONS 87 88 Inputs: 89 st = pointer to pitchOLWghtState structure 90 vadSt = pointer to a vadState structure 91 mode = coder mode (Mode) 92 wsp = pointer to buffer of signal used to compute the Open loop pitch 93 T_op = pointer to open loop pitch lag 94 old_lags = pointer to history with old stored Cl lags (Word16) 95 ol_gain_flg = pointer to OL gain flag (Word16) 96 idx = 16 bit value specifies the frame index 97 dtx = Data of type 'Flag' used for dtx. Use dtx=1, do not use dtx=0 98 pOverflow = pointer to Overflow indicator (Flag) 99 100 Outputs: 101 pOverflow -> 1 if processing this funvction results in satuaration 102 103 Returns: 104 Zero 105 106 Global Variables Used: 107 None 108 109 Local Variables Needed: 110 None 111 112 ------------------------------------------------------------------------------ 113 FUNCTION DESCRIPTION 114 115 This function computes the open loop pitch lag. 116 117 ------------------------------------------------------------------------------ 118 REQUIREMENTS 119 120 None 121 122 ------------------------------------------------------------------------------ 123 REFERENCES 124 125 ol_ltp.c, UMTS GSM AMR speech codec, R99 - Version 3.2.0, March 2, 2001 126 127 ------------------------------------------------------------------------------ 128 PSEUDO-CODE 129 130 int ol_ltp( 131 pitchOLWghtState *st, // i/o : State struct 132 vadState *vadSt, // i/o : VAD state struct 133 enum Mode mode, // i : coder mode 134 Word16 wsp[], // i : signal used to compute the OL pitch, Q0 135 // uses signal[-pit_max] to signal[-1] 136 Word16 *T_op, // o : open loop pitch lag, Q0 137 Word16 old_lags[], // i : history with old stored Cl lags 138 Word16 ol_gain_flg[], // i : OL gain flag 139 Word16 idx, // i : index 140 Flag dtx // i : dtx flag; use dtx=1, do not use dtx=0 141 ) 142 { 143 if (sub ((Word16)mode, (Word16)MR102) != 0 ) 144 { 145 ol_gain_flg[0] = 0; 146 ol_gain_flg[1] = 0; 147 } 148 149 if (sub ((Word16)mode, (Word16)MR475) == 0 || sub ((Word16)mode, (Word16)MR515) == 0 ) 150 { 151 *T_op = Pitch_ol(vadSt, mode, wsp, PIT_MIN, PIT_MAX, L_FRAME, idx, dtx); 152 } 153 else 154 { 155 if ( sub ((Word16)mode, (Word16)MR795) <= 0 ) 156 { 157 *T_op = Pitch_ol(vadSt, mode, wsp, PIT_MIN, PIT_MAX, L_FRAME_BY2, 158 idx, dtx); 159 } 160 else if ( sub ((Word16)mode, (Word16)MR102) == 0 ) 161 { 162 *T_op = Pitch_ol_wgh(st, vadSt, wsp, PIT_MIN, PIT_MAX, L_FRAME_BY2, 163 old_lags, ol_gain_flg, idx, dtx); 164 } 165 else 166 { 167 *T_op = Pitch_ol(vadSt, mode, wsp, PIT_MIN_MR122, PIT_MAX, 168 L_FRAME_BY2, idx, dtx); 169 } 170 } 171 return 0; 172 } 173 174 ------------------------------------------------------------------------------ 175 RESOURCES USED [optional] 176 177 When the code is written for a specific target processor the 178 the resources used should be documented below. 179 180 HEAP MEMORY USED: x bytes 181 182 STACK MEMORY USED: x bytes 183 184 CLOCK CYCLES: (cycle count equation for this function) + (variable 185 used to represent cycle count for each subroutine 186 called) 187 where: (cycle count variable) = cycle count for [subroutine 188 name] 189 190 ------------------------------------------------------------------------------ 191 CAUTION [optional] 192 [State any special notes, constraints or cautions for users of this function] 193 194 ------------------------------------------------------------------------------ 195 */ 196 197 198 /*---------------------------------------------------------------------------- 199 ; FUNCTION CODE 200 ----------------------------------------------------------------------------*/ 201 void ol_ltp( 202 pitchOLWghtState *st, /* i/o : State struct */ 203 vadState *vadSt, /* i/o : VAD state struct */ 204 enum Mode mode, /* i : coder mode */ 205 Word16 wsp[], /* i : signal used to compute the OL pitch, Q0 */ 206 /* uses signal[-pit_max] to signal[-1] */ 207 Word16 *T_op, /* o : open loop pitch lag, Q0 */ 208 Word16 old_lags[], /* i : history with old stored Cl lags */ 209 Word16 ol_gain_flg[], /* i : OL gain flag */ 210 Word16 idx, /* i : index */ 211 Flag dtx, /* i : dtx flag; use dtx=1, do not use dtx=0 */ 212 Flag *pOverflow /* i/o : overflow indicator */ 213 ) 214 { 215 if ((mode != MR102)) 216 { 217 ol_gain_flg[0] = 0; 218 ol_gain_flg[1] = 0; 219 } 220 221 if ((mode == MR475) || (mode == MR515)) 222 { 223 *T_op = Pitch_ol(vadSt, mode, wsp, PIT_MIN, PIT_MAX, L_FRAME, idx, dtx, 224 pOverflow); 225 } 226 else 227 { 228 if (mode <= MR795) 229 { 230 *T_op = Pitch_ol(vadSt, mode, wsp, PIT_MIN, PIT_MAX, L_FRAME_BY2, 231 idx, dtx, pOverflow); 232 } 233 else if (mode == MR102) 234 { 235 *T_op = Pitch_ol_wgh(st, vadSt, wsp, PIT_MIN, PIT_MAX, L_FRAME_BY2, 236 old_lags, ol_gain_flg, idx, dtx, pOverflow); 237 } 238 else 239 { 240 *T_op = Pitch_ol(vadSt, mode, wsp, PIT_MIN_MR122, PIT_MAX, 241 L_FRAME_BY2, idx, dtx, pOverflow); 242 } 243 } 244 245 } 246 247
