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: a_refl.h 35 36 ------------------------------------------------------------------------------ 37 INCLUDE DESCRIPTION 38 39 File : a_refl.h 40 Purpose : Convert from direct form coefficients to 41 reflection coefficients 42 43 ------------------------------------------------------------------------------ 44 */ 45 46 #ifndef A_REFL_H 47 #define A_REFL_H 48 #define a_refl_h "$Id $" 49 50 /*---------------------------------------------------------------------------- 51 ; INCLUDES 52 ----------------------------------------------------------------------------*/ 53 #include "typedef.h" 54 55 /*--------------------------------------------------------------------------*/ 56 #ifdef __cplusplus 57 extern "C" 58 { 59 #endif 60 61 /*---------------------------------------------------------------------------- 62 ; MACROS 63 ; Define module specific macros here 64 ----------------------------------------------------------------------------*/ 65 66 /*---------------------------------------------------------------------------- 67 ; DEFINES 68 ; Include all pre-processor statements here. 69 ----------------------------------------------------------------------------*/ 70 71 /*---------------------------------------------------------------------------- 72 ; EXTERNAL VARIABLES REFERENCES 73 ; Declare variables used in this module but defined elsewhere 74 ----------------------------------------------------------------------------*/ 75 76 /*---------------------------------------------------------------------------- 77 ; SIMPLE TYPEDEF'S 78 ----------------------------------------------------------------------------*/ 79 80 /*---------------------------------------------------------------------------- 81 ; ENUMERATED TYPEDEF'S 82 ----------------------------------------------------------------------------*/ 83 84 /*---------------------------------------------------------------------------- 85 ; STRUCTURES TYPEDEF'S 86 ----------------------------------------------------------------------------*/ 87 88 /*---------------------------------------------------------------------------- 89 ; GLOBAL FUNCTION DEFINITIONS 90 ; Function Prototype declaration 91 ----------------------------------------------------------------------------*/ 92 /* 93 * FUNCTION: A_Refl() 94 * PURPOSE: Convert from direct form coefficients to reflection coefficients 95 * DESCRIPTION: 96 * Directform coeffs in Q12 are converted to 97 * reflection coefficients Q15 98 */ 99 void A_Refl( 100 Word16 a[], /* i : Directform coefficients */ 101 Word16 refl[], /* o : Reflection coefficients */ 102 Flag *pOverflow 103 ); 104 105 /*---------------------------------------------------------------------------- 106 ; END 107 ----------------------------------------------------------------------------*/ 108 #ifdef __cplusplus 109 } 110 #endif 111 112 #endif /* _A_REFL_H_ */ 113 114 115 116