pit_shrp.cpp revision 4f1efc098cb5791c3e9f483f2af84aef70d2d0a0 
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/****************************************************************************************
19Portions of this file are derived from the following 3GPP standard:
20
21    3GPP TS 26.173
22    ANSI-C code for the Adaptive Multi-Rate - Wideband (AMR-WB) speech codec
23    Available from http://www.3gpp.org
24
25(C) 2007, 3GPP Organizational Partners (ARIB, ATIS, CCSA, ETSI, TTA, TTC)
26Permission to distribute, modify and use this file under the standard license
27terms listed above has been obtained from the copyright holder.
28****************************************************************************************/
29/*
30------------------------------------------------------------------------------
31
32
33
34 Filename: pit_shrp.cpp
35
36     Date: 05/08/2007
37
38------------------------------------------------------------------------------
39 REVISION HISTORY
40
41
42 Description:
43
44------------------------------------------------------------------------------
45 INPUT AND OUTPUT DEFINITIONS
46
47     int16 * x,           in/out: impulse response (or algebraic code)
48     int16 pit_lag,       input : pitch lag
49     int16 sharp,         input : pitch sharpening factor (Q15)
50     int16 L_subfr        input : subframe size
51
52------------------------------------------------------------------------------
53 FUNCTION DESCRIPTION
54
55    Performs Pitch sharpening routine
56
57------------------------------------------------------------------------------
58 REQUIREMENTS
59
60
61------------------------------------------------------------------------------
62 REFERENCES
63
64------------------------------------------------------------------------------
65 PSEUDO-CODE
66
67------------------------------------------------------------------------------
68*/
69
70
71/*----------------------------------------------------------------------------
72; INCLUDES
73----------------------------------------------------------------------------*/
74#include "pv_amr_wb_type_defs.h"
75#include "pvamrwbdecoder_basic_op.h"
76#include "pvamrwbdecoder_acelp.h"
77
78/*----------------------------------------------------------------------------
79; MACROS
80; Define module specific macros here
81----------------------------------------------------------------------------*/
82
83
84/*----------------------------------------------------------------------------
85; DEFINES
86; Include all pre-processor statements here. Include conditional
87; compile variables also.
88----------------------------------------------------------------------------*/
89
90/*----------------------------------------------------------------------------
91; LOCAL FUNCTION DEFINITIONS
92; Function Prototype declaration
93----------------------------------------------------------------------------*/
94
95/*----------------------------------------------------------------------------
96; LOCAL STORE/BUFFER/POINTER DEFINITIONS
97; Variable declaration - defined here and used outside this module
98----------------------------------------------------------------------------*/
99
100/*----------------------------------------------------------------------------
101; EXTERNAL FUNCTION REFERENCES
102; Declare functions defined elsewhere and referenced in this module
103----------------------------------------------------------------------------*/
104
105/*----------------------------------------------------------------------------
106; EXTERNAL GLOBAL STORE/BUFFER/POINTER REFERENCES
107; Declare variables used in this module but defined elsewhere
108----------------------------------------------------------------------------*/
109
110/*----------------------------------------------------------------------------
111; FUNCTION CODE
112----------------------------------------------------------------------------*/
113
114void Pit_shrp(
115    int16 * x,         /* in/out: impulse response (or algebraic code) */
116    int16 pit_lag,     /* input : pitch lag                            */
117    int16 sharp,       /* input : pitch sharpening factor (Q15)        */
118    int16 L_subfr      /* input : subframe size                        */
119)
120{
121    int16 i;
122    int32 L_tmp;
123
124    for (i = pit_lag; i < L_subfr; i++)
125    {
126        L_tmp = mac_16by16_to_int32((int32)x[i] << 16, x[i - pit_lag], sharp);
127        x[i] = amr_wb_round(L_tmp);
128
129    }
130
131    return;
132}
133