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 ------------------------------------------------------------------------------
36 ------------------------------------------------------------------------------
40 Purpose : 2 LP analyses centered at 2nd and 4th subframe
41 for mode 12.2. For all other modes a
42 LP analysis centered at 4th subframe is
45 ------------------------------------------------------------------------------
52 /*----------------------------------------------------------------------------
54 ----------------------------------------------------------------------------*/
58 #include "get_const_tbls.h"
61 /*--------------------------------------------------------------------------*/
67 /*----------------------------------------------------------------------------
69 ; [Define module specific macros here]
70 ----------------------------------------------------------------------------*/
72 /*----------------------------------------------------------------------------
74 ; [Include all pre-processor statements here.]
75 ----------------------------------------------------------------------------*/
77 /*----------------------------------------------------------------------------
78 ; EXTERNAL VARIABLES REFERENCES
79 ; [Declare variables used in this module but defined elsewhere]
80 ----------------------------------------------------------------------------*/
82 /*----------------------------------------------------------------------------
84 ----------------------------------------------------------------------------*/
86 /*----------------------------------------------------------------------------
87 ; ENUMERATED TYPEDEF'S
88 ----------------------------------------------------------------------------*/
90 /*----------------------------------------------------------------------------
91 ; STRUCTURES TYPEDEF'S
92 ----------------------------------------------------------------------------*/
95 LevinsonState *levinsonSt;
99 /*----------------------------------------------------------------------------
100 ; GLOBAL FUNCTION DEFINITIONS
101 ; [List function prototypes here]
102 ----------------------------------------------------------------------------*/
103 Word16 lpc_init(lpcState **st);
104 /* initialize one instance of the pre processing state.
105 Stores pointer to filter status struct in *st. This pointer has to
106 be passed to lpc in each call.
110 Word16 lpc_reset(lpcState *st);
111 /* reset of pre processing state (i.e. set state memory to zero)
114 void lpc_exit(lpcState **st);
115 /* de-initialize pre processing state (i.e. free status struct)
120 lpcState *st, /* i/o: State struct */
121 enum Mode mode, /* i : coder mode */
122 Word16 x[], /* i : Input signal Q15 */
123 Word16 x_12k2[], /* i : Input signal (EFR) Q15 */
124 Word16 a[], /* o : predictor coefficients Q12 */
125 CommonAmrTbls* common_amr_tbls, /* i : ptr to struct with table ptrs */