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 26.073
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)
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 Filename: /audio/gsm_amr/c/include/l_mac.h
31
32------------------------------------------------------------------------------
33 REVISION HISTORY
34
35 Description: Created separate header file for L_mac function.
36
37 Description: Updated function prototype declaration to reflect new interface.
38              A pointer to overflow flag is passed into the function. Updated
39              template.
40
41 Description: Moved _cplusplus #ifdef after Include section.
42
43 Description: 1. Updated the function to include ARM and Linux-ARM assembly
44                 instructions.
45              2. Added OSCL_UNUSED_ARG(pOverflow) to remove compiler warnings.
46
47 Description:
48
49------------------------------------------------------------------------------
50 INCLUDE DESCRIPTION
51
52 This file contains all the constant definitions and prototype definitions
53 needed by the L_mac function.
54
55------------------------------------------------------------------------------
56*/
57
58/*----------------------------------------------------------------------------
59; CONTINUE ONLY IF NOT ALREADY DEFINED
60----------------------------------------------------------------------------*/
61#ifndef L_MAC_H
62#define L_MAC_H
63
64/*----------------------------------------------------------------------------
65; INCLUDES
66----------------------------------------------------------------------------*/
67#include    "basicop_malloc.h"
68
69/*--------------------------------------------------------------------------*/
70#ifdef __cplusplus
71extern "C"
72{
73#endif
74
75    /*----------------------------------------------------------------------------
76    ; MACROS
77    ; Define module specific macros here
78    ----------------------------------------------------------------------------*/
79
80    /*----------------------------------------------------------------------------
81    ; DEFINES
82    ; Include all pre-processor statements here.
83    ----------------------------------------------------------------------------*/
84
85    /*----------------------------------------------------------------------------
86    ; EXTERNAL VARIABLES REFERENCES
87    ; Declare variables used in this module but defined elsewhere
88    ----------------------------------------------------------------------------*/
89
90    /*----------------------------------------------------------------------------
91    ; SIMPLE TYPEDEF'S
92    ----------------------------------------------------------------------------*/
93
94    /*----------------------------------------------------------------------------
95    ; ENUMERATED TYPEDEF'S
96    ----------------------------------------------------------------------------*/
97
98    /*----------------------------------------------------------------------------
99    ; STRUCTURES TYPEDEF'S
100    ----------------------------------------------------------------------------*/
101
102    /*----------------------------------------------------------------------------
103    ; GLOBAL FUNCTION DEFINITIONS
104    ; Function Prototype declaration
105    ----------------------------------------------------------------------------*/
106#if defined(PV_ARM_V5) /* Instructions for ARM Assembly on ADS*/
107
108    __inline Word32 L_mac(Word32 L_var3, Word16 var1, Word16 var2, Flag *pOverflow)
109    {
110        Word32 result;
111        Word32 L_sum;
112
113        OSCL_UNUSED_ARG(pOverflow);
114
115        __asm {SMULBB result, var1, var2}
116        __asm {QDADD L_sum, L_var3, result}
117        return (L_sum);
118    }
119
120#elif defined(PV_ARM_GCC_V5) /* Instructions for ARM-linux cross-compiler*/
121
122    static inline Word32 L_mac(Word32 L_var3, Word16 var1, Word16 var2, Flag *pOverflow)
123    {
124        register Word32 ra = L_var3;
125        register Word32 rb = var1;
126        register Word32 rc = var2;
127        Word32 result;
128
129        OSCL_UNUSED_ARG(pOverflow);
130
131        asm volatile("smulbb %0, %1, %2"
132             : "=r"(result)
133                             : "r"(rb), "r"(rc)
134                            );
135
136        asm volatile("qdadd %0, %1, %2"
137             : "=r"(rc)
138                             : "r"(ra), "r"(result)
139                            );
140
141        return (rc);
142    }
143
144#else /* C_EQUIVALENT */
145
146    __inline Word32 L_mac(Word32 L_var3, Word16 var1, Word16 var2, Flag *pOverflow)
147    {
148        Word32 result;
149        Word32 L_sum;
150        result = (Word32) var1 * var2;
151        if (result != (Word32) 0x40000000L)
152        {
153            L_sum = (result << 1) + L_var3;
154
155            /* Check if L_sum and L_var_3 share the same sign */
156            if ((L_var3 ^ result) > 0)
157            {
158                if ((L_sum ^ L_var3) < 0)
159                {
160                    L_sum = (L_var3 < 0) ? MIN_32 : MAX_32;
161                    *pOverflow = 1;
162                }
163            }
164        }
165        else
166        {
167            *pOverflow = 1;
168            L_sum = MAX_32;
169        }
170        return (L_sum);
171    }
172
173#endif
174    /*----------------------------------------------------------------------------
175    ; END
176    ----------------------------------------------------------------------------*/
177#ifdef __cplusplus
178}
179#endif
180
181#endif /* _L_MAC_H_ */
182
183
184