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 #include "amrdecode.h"
91 
92 /*--------------------------------------------------------------------------*/
93 #ifdef __cplusplus
94 extern "C"
95 {
96 #endif
97 
98     /*----------------------------------------------------------------------------
99     ; MACROS
100     ----------------------------------------------------------------------------*/
101 
102 
103     /*----------------------------------------------------------------------------
104     ; DEFINES
105     ----------------------------------------------------------------------------*/
106     /* Number of 13-bit linear PCM samples per 20 ms frame */
107     /* L_FRAME = (8 kHz) * (20 msec) = 160 samples         */
108 #define L_FRAME     160
109 
110     /*----------------------------------------------------------------------------
111     ; EXTERNAL VARIABLES REFERENCES
112     ----------------------------------------------------------------------------*/
113 
114 
115     /*----------------------------------------------------------------------------
116     ; SIMPLE TYPEDEF'S
117     ----------------------------------------------------------------------------*/
118 
119     /*----------------------------------------------------------------------------
120     ; ENUMERATED TYPEDEF'S
121     ----------------------------------------------------------------------------*/
122 
123     /*----------------------------------------------------------------------------
124     ; STRUCTURES TYPEDEF'S
125     ----------------------------------------------------------------------------*/
126 
127 
128     /*----------------------------------------------------------------------------
129     ; GLOBAL FUNCTION DEFINITIONS
130     ----------------------------------------------------------------------------*/
131     /*
132      * This function allocates memory for filter structure and initializes state
133      * memory used by the GSM AMR decoder. This function returns zero. It will
134      * return negative one if there is an error.
135      */
136     Word16 GSMInitDecode(void **state_data,
137                          Word8 *id);
138 
139     /*
140      * This function resets the state memory used by the GSM AMR decoder. This
141      * function returns zero. It will return negative one if there is an error.
142      */
143     Word16 Speech_Decode_Frame_reset(void *state_data);
144 
145     /*
146      * This function frees up the memory used for the state memory of the
147      * GSM AMR decoder.
148      */
149     void GSMDecodeFrameExit(void **state_data);
150 
151 
152 #ifdef __cplusplus
153 }
154 #endif
155 
156 #endif  /* _GSMAMR_DEC_H_ */
157 
158