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 - Wideband (AMR-WB) speech codec
23 Available from http://www.3gpp.org
25 (C) 2007, 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 Filename: preemph_amrwb_dec.cpp
36 ------------------------------------------------------------------------------
37 INPUT AND OUTPUT DEFINITIONS
39 int16 x[], (i/o) : input signal overwritten by the output
40 int16 mu, (i) Q15 : preemphasis coefficient
41 int16 lg (i) : lenght of filtering
43 ------------------------------------------------------------------------------
46 Preemphasis: filtering through 1 - g z^-1
48 ------------------------------------------------------------------------------
52 ------------------------------------------------------------------------------
55 ------------------------------------------------------------------------------
58 ------------------------------------------------------------------------------
61 /*----------------------------------------------------------------------------
63 ----------------------------------------------------------------------------*/
65 #include "pv_amr_wb_type_defs.h"
66 #include "pvamrwbdecoder_basic_op.h"
67 #include "pvamrwbdecoder_acelp.h"
69 /*----------------------------------------------------------------------------
71 ; Define module specific macros here
72 ----------------------------------------------------------------------------*/
75 /*----------------------------------------------------------------------------
77 ; Include all pre-processor statements here. Include conditional
78 ; compile variables also.
79 ----------------------------------------------------------------------------*/
81 /*----------------------------------------------------------------------------
82 ; LOCAL FUNCTION DEFINITIONS
83 ; Function Prototype declaration
84 ----------------------------------------------------------------------------*/
86 /*----------------------------------------------------------------------------
87 ; LOCAL STORE/BUFFER/POINTER DEFINITIONS
88 ; Variable declaration - defined here and used outside this module
89 ----------------------------------------------------------------------------*/
91 /*----------------------------------------------------------------------------
92 ; EXTERNAL FUNCTION REFERENCES
93 ; Declare functions defined elsewhere and referenced in this module
94 ----------------------------------------------------------------------------*/
96 /*----------------------------------------------------------------------------
97 ; EXTERNAL GLOBAL STORE/BUFFER/POINTER REFERENCES
98 ; Declare variables used in this module but defined elsewhere
99 ----------------------------------------------------------------------------*/
101 /*----------------------------------------------------------------------------
103 ----------------------------------------------------------------------------*/
106 void preemph_amrwb_dec(
107 int16 x[], /* (i/o) : input signal overwritten by the output */
108 int16 mu, /* (i) Q15 : preemphasis coefficient */
109 int16 lg /* (i) : lenght of filtering */
115 for (i = lg - 1; i != 0; i--)
117 L_tmp = msu_16by16_from_int32((int32)x[i] << 16, x[i - 1], mu);
118 x[i] = amr_wb_round(L_tmp);