1 /* ------------------------------------------------------------------
2 * Copyright (C) 1998-2009 PacketVideo
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
8 * http://www.apache.org/licenses/LICENSE-2.0
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
14 * See the License for the specific language governing permissions
15 * and limitations under the License.
16 * -------------------------------------------------------------------
18 /****************************************************************************************
19 Portions of this file are derived from the following 3GPP standard:
22 ANSI-C code for the Adaptive Multi-Rate (AMR) speech codec
23 Available from http://www.3gpp.org
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 ****************************************************************************************/
30 ------------------------------------------------------------------------------
34 ------------------------------------------------------------------------------
37 This file contains all the constant definitions and prototype definitions
38 needed by the file, preemph.c
40 ------------------------------------------------------------------------------
43 /*----------------------------------------------------------------------------
44 ; CONTINUE ONLY IF NOT ALREADY DEFINED
45 ----------------------------------------------------------------------------*/
47 #define preemph_h "$Id $"
50 /*----------------------------------------------------------------------------
52 ----------------------------------------------------------------------------*/
56 /*--------------------------------------------------------------------------*/
62 /*----------------------------------------------------------------------------
64 ; Define module specific macros here
65 ----------------------------------------------------------------------------*/
67 /*----------------------------------------------------------------------------
69 ; Include all pre-processor statements here.
70 ----------------------------------------------------------------------------*/
72 /*----------------------------------------------------------------------------
73 ; EXTERNAL VARIABLES REFERENCES
74 ; Declare variables used in this module but defined elsewhere
75 ----------------------------------------------------------------------------*/
77 /*----------------------------------------------------------------------------
79 ----------------------------------------------------------------------------*/
81 /*----------------------------------------------------------------------------
82 ; ENUMERATED TYPEDEF'S
83 ----------------------------------------------------------------------------*/
85 /*----------------------------------------------------------------------------
86 ; STRUCTURES TYPEDEF'S
87 ----------------------------------------------------------------------------*/
90 Word16 mem_pre; /* filter state */
93 /*----------------------------------------------------------------------------
94 ; GLOBAL FUNCTION DEFINITIONS
95 ; Function Prototype declaration
96 ----------------------------------------------------------------------------*/
98 Word16 preemphasis_reset(preemphasisState *st);
99 /* reset of preemphasis filter (i.e. set state memory to zero)
102 void preemphasis_exit(preemphasisState **st);
103 /* de-initialize preemphasis filter (i.e. free status struct)
108 preemphasisState *st, /* (i/o): preemphasis filter state */
109 Word16 *signal, /* (i/o): input signal overwritten by the output */
110 Word16 g, /* (i) : preemphasis coefficient */
111 Word16 L, /* (i) : size of filtering */
112 Flag *pOverflow /* (o) : overflow indicator */
115 /*----------------------------------------------------------------------------
117 ----------------------------------------------------------------------------*/
122 #endif /* preemph_H_ */