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/**************************************************************************************** 19Portions 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) 26Permission to distribute, modify and use this file under the standard license 27terms listed above has been obtained from the copyright holder. 28****************************************************************************************/ 29/* 30 31 Filename: /audio/gsm_amr/c/include/lsp_avg.h 32 33------------------------------------------------------------------------------ 34 REVISION HISTORY 35 36 Description: Placed header file in the proper template format. Added 37 parameter pOverflow for the basic math ops. 38 39 Description: Moved _cplusplus #ifdef after Include section. 40 41 Who: Date: 42 Description: 43 44------------------------------------------------------------------------------ 45 INCLUDE DESCRIPTION 46 47 This file contains all the constant definitions and prototype definitions 48 needed by the lsp_avg.c 49 50------------------------------------------------------------------------------ 51*/ 52 53/*---------------------------------------------------------------------------- 54; CONTINUE ONLY IF NOT ALREADY DEFINED 55----------------------------------------------------------------------------*/ 56#ifndef int_lpc_h 57#define int_lpc_h "$Id $" 58 59/*---------------------------------------------------------------------------- 60; INCLUDES 61----------------------------------------------------------------------------*/ 62#include "typedef.h" 63 64/*--------------------------------------------------------------------------*/ 65#ifdef __cplusplus 66extern "C" 67{ 68#endif 69 70 /*---------------------------------------------------------------------------- 71 ; MACROS 72 ; Define module specific macros here 73 ----------------------------------------------------------------------------*/ 74 75 /*---------------------------------------------------------------------------- 76 ; DEFINES 77 ; Include all pre-processor statements here. 78 ----------------------------------------------------------------------------*/ 79 80 /*---------------------------------------------------------------------------- 81 ; EXTERNAL VARIABLES REFERENCES 82 ; Declare variables used in this module but defined elsewhere 83 ----------------------------------------------------------------------------*/ 84 85 /*---------------------------------------------------------------------------- 86 ; SIMPLE TYPEDEF'S 87 ----------------------------------------------------------------------------*/ 88 89 /*---------------------------------------------------------------------------- 90 ; ENUMERATED TYPEDEF'S 91 ----------------------------------------------------------------------------*/ 92 93 /*---------------------------------------------------------------------------- 94 ; STRUCTURES TYPEDEF'S 95 ----------------------------------------------------------------------------*/ 96 97 /*---------------------------------------------------------------------------- 98 ; GLOBAL FUNCTION DEFINITIONS 99 ; Function Prototype declaration 100 ----------------------------------------------------------------------------*/ 101 102 /* 103 ************************************************************************** 104 * 105 * Function : Int_lpc_1and3 106 * Purpose : Interpolates the LSPs and converts to LPC parameters 107 * to get a different LP filter in each subframe. 108 * Description : The 20 ms speech frame is divided into 4 subframes. 109 * The LSPs are quantized and transmitted at the 2nd and 110 * 4th subframes (twice per frame) and interpolated at the 111 * 1st and 3rd subframe. 112 * 113 * |------|------|------|------| 114 * sf1 sf2 sf3 sf4 115 * F0 Fm F1 116 * 117 * sf1: 1/2 Fm + 1/2 F0 sf3: 1/2 F1 + 1/2 Fm 118 * sf2: Fm sf4: F1 119 * Returns : void 120 * 121 ************************************************************************** 122 */ 123 void Int_lpc_1and3( 124 Word16 lsp_old[], /* i : LSP vector at the 4th subfr. of past frame (M) */ 125 Word16 lsp_mid[], /* i : LSP vector at the 2nd subfr. of 126 present frame (M) */ 127 Word16 lsp_new[], /* i : LSP vector at the 4th subfr. of 128 present frame (M) */ 129 Word16 Az[], /* o : interpolated LP parameters in all subfr. 130 (AZ_SIZE) */ 131 Flag *pOverflow 132 ); 133 134 /* 135 ************************************************************************** 136 * 137 * Function : Int_lpc_1and3_2 138 * Purpose : Interpolation of the LPC parameters. Same as the Int_lpc 139 * function but we do not recompute Az() for subframe 2 and 140 * 4 because it is already available. 141 * Returns : void 142 * 143 ************************************************************************** 144 */ 145 void Int_lpc_1and3_2( 146 Word16 lsp_old[], /* i : LSP vector at the 4th subfr. of past frame (M) */ 147 Word16 lsp_mid[], /* i : LSP vector at the 2nd subframe of 148 present frame (M) */ 149 Word16 lsp_new[], /* i : LSP vector at the 4th subframe of 150 present frame (M) */ 151 Word16 Az[], /* o :interpolated LP parameters 152 in subframes 1 and 3 (AZ_SIZE) */ 153 Flag *pOverflow 154 ); 155 156 /* 157 ************************************************************************** 158 * 159 * Function : Int_lpc_1to3 160 * Purpose : Interpolates the LSPs and converts to LPC parameters 161 * to get a different LP filter in each subframe. 162 * Description : The 20 ms speech frame is divided into 4 subframes. 163 * The LSPs are quantized and transmitted at the 4th 164 * subframes (once per frame) and interpolated at the 165 * 1st, 2nd and 3rd subframe. 166 * 167 * |------|------|------|------| 168 * sf1 sf2 sf3 sf4 169 * F0 F1 170 * 171 * sf1: 3/4 F0 + 1/4 F1 sf3: 1/4 F0 + 3/4 F1 172 * sf2: 1/2 F0 + 1/2 F1 sf4: F1 173 * Returns : void 174 * 175 ************************************************************************** 176 */ 177 void Int_lpc_1to3( 178 Word16 lsp_old[], /* i : LSP vector at the 4th SF of past frame (M) */ 179 Word16 lsp_new[], /* i : LSP vector at the 4th SF of present frame (M) */ 180 Word16 Az[], /* o : interpolated LP parameters in all SFs (AZ_SIZE) */ 181 Flag *pOverflow 182 ); 183 184 /* 185 ************************************************************************** 186 * 187 * Function : Int_lpc_1to3_2 188 * Purpose : Interpolation of the LPC parameters. Same as the Int_lpc 189 * function but we do not recompute Az() for subframe 4 190 * because it is already available. 191 * Returns : void 192 * 193 ************************************************************************** 194 */ 195 void Int_lpc_1to3_2( 196 Word16 lsp_old[], /* i : LSP vector at the 4th SF of past frame (M) */ 197 Word16 lsp_new[], /* i : LSP vector at the 4th SF present frame (M) */ 198 Word16 Az[], /* o :interpolated LP parameters in SFs 1, 2, 3 199 (AZ_SIZE) */ 200 Flag *pOverflow 201 ); 202 203 /*---------------------------------------------------------------------------- 204 ; END 205 ----------------------------------------------------------------------------*/ 206#ifdef __cplusplus 207} 208#endif 209 210#endif /* _INT_LPC_H_ */ 211 212 213