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 Filename: /audio/gsm_amr/c/include/a_refl.h 35 36 Date: 08/11/2000 37 38 ------------------------------------------------------------------------------ 39 REVISION HISTORY 40 41 Description: Moved _cplusplus #ifdef after Include section. 42 43 Description: 44 45 ------------------------------------------------------------------------------ 46 INCLUDE DESCRIPTION 47 48 File : a_refl.h 49 Purpose : Convert from direct form coefficients to 50 reflection coefficients 51 52 ------------------------------------------------------------------------------ 53 */ 54 55 #ifndef A_REFL_H 56 #define A_REFL_H 57 #define a_refl_h "$Id $" 58 59 /*---------------------------------------------------------------------------- 60 ; INCLUDES 61 ----------------------------------------------------------------------------*/ 62 #include "typedef.h" 63 64 /*--------------------------------------------------------------------------*/ 65 #ifdef __cplusplus 66 extern "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 * FUNCTION: A_Refl() 103 * PURPOSE: Convert from direct form coefficients to reflection coefficients 104 * DESCRIPTION: 105 * Directform coeffs in Q12 are converted to 106 * reflection coefficients Q15 107 */ 108 void A_Refl( 109 Word16 a[], /* i : Directform coefficients */ 110 Word16 refl[], /* o : Reflection coefficients */ 111 Flag *pOverflow 112 ); 113 114 /*---------------------------------------------------------------------------- 115 ; END 116 ----------------------------------------------------------------------------*/ 117 #ifdef __cplusplus 118 } 119 #endif 120 121 #endif /* _A_REFL_H_ */ 122 123 124 125