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/gsmamr_dec.h 35 36 Date: 09/10/2001 37 38 ------------------------------------------------------------------------------ 39 REVISION HISTORY 40 41 Description: Adding comments and removing some tables as per review comments. 42 43 Description: Replace enum Mode with enum Frame_Type_3GPP and updated function 44 prototype of AMRDecode(). 45 46 Description: Added back the enum Mode type definition, removed RXFrameType 47 type definition, and updated AMRDecode and GSMInitDecode function 48 prototypes. 49 50 Description: Added #defines for WMF and IF2. Updated AMRDecode function 51 prototype. 52 53 Description: Removed enum Mode type definition and updated AMRDecode function 54 prototype. 55 56 Description: Renamed WMF and IF2 to AMR_WMF and AMR_IF2, respectively. Added 57 #define for AMR_ETS format. 58 59 Description: Rename input format defines to make it unique to the decoder. 60 61 Description: Added comment to describe L_FRAME. 62 63 Description: Moved _cplusplus #ifdef after Include section. 64 65 Description: Included file "typedefs.h" to avoid re-declaring similar typedef 66 this for OSCL-ed compatibility 67 68 Description: Included file "gsm_amr_typedefs.h" and eliminated re-definition 69 of types UWord8, Word8, Word16 70 71 Description: 72 73 ------------------------------------------------------------------------------ 74 INCLUDE DESCRIPTION 75 76 This header contains all the necessary information needed to allow the gsm amr 77 decoder library to be used properly upon release. 78 79 ------------------------------------------------------------------------------ 80 */ 81 #ifndef _GSMAMR_DEC_H_ 82 #define _GSMAMR_DEC_H_ 83 84 /*---------------------------------------------------------------------------- 85 ; INCLUDES 86 ----------------------------------------------------------------------------*/ 87 88 #include "gsm_amr_typedefs.h" 89 #include "frame_type_3gpp.h" 90 91 /*--------------------------------------------------------------------------*/ 92 #ifdef __cplusplus 93 extern "C" 94 { 95 #endif 96 97 /*---------------------------------------------------------------------------- 98 ; MACROS 99 ----------------------------------------------------------------------------*/ 100 101 102 /*---------------------------------------------------------------------------- 103 ; DEFINES 104 ----------------------------------------------------------------------------*/ 105 /* Number of 13-bit linear PCM samples per 20 ms frame */ 106 /* L_FRAME = (8 kHz) * (20 msec) = 160 samples */ 107 #define L_FRAME 160 108 109 /*---------------------------------------------------------------------------- 110 ; EXTERNAL VARIABLES REFERENCES 111 ----------------------------------------------------------------------------*/ 112 113 114 /*---------------------------------------------------------------------------- 115 ; SIMPLE TYPEDEF'S 116 ----------------------------------------------------------------------------*/ 117 118 /*---------------------------------------------------------------------------- 119 ; ENUMERATED TYPEDEF'S 120 ----------------------------------------------------------------------------*/ 121 122 /*---------------------------------------------------------------------------- 123 ; STRUCTURES TYPEDEF'S 124 ----------------------------------------------------------------------------*/ 125 126 127 /*---------------------------------------------------------------------------- 128 ; GLOBAL FUNCTION DEFINITIONS 129 ----------------------------------------------------------------------------*/ 130 /* 131 * This function allocates memory for filter structure and initializes state 132 * memory used by the GSM AMR decoder. This function returns zero. It will 133 * return negative one if there is an error. 134 */ 135 Word16 GSMInitDecode(void **state_data, 136 Word8 *id); 137 138 /* 139 * AMRDecode steps into the part of the library that decodes the raw data 140 * speech bits for the decoding process. It returns the address offset of 141 * the next frame to be decoded. 142 */ 143 Word16 AMRDecode( 144 void *state_data, 145 enum Frame_Type_3GPP frame_type, 146 UWord8 *speech_bits_ptr, 147 Word16 *raw_pcm_buffer, 148 Word16 input_format 149 ); 150 151 /* 152 * This function resets the state memory used by the GSM AMR decoder. This 153 * function returns zero. It will return negative one if there is an error. 154 */ 155 Word16 Speech_Decode_Frame_reset(void *state_data); 156 157 /* 158 * This function frees up the memory used for the state memory of the 159 * GSM AMR decoder. 160 */ 161 void GSMDecodeFrameExit(void **state_data); 162 163 164 #ifdef __cplusplus 165 } 166 #endif 167 168 #endif /* _GSMAMR_DEC_H_ */ 169 170
