clz.h revision 2228e360595641dd906bf1773307f43d304f5b2e 
1
2/* -----------------------------------------------------------------------------------------------------------
3Software License for The Fraunhofer FDK AAC Codec Library for Android
4
5� Copyright  1995 - 2012 Fraunhofer-Gesellschaft zur F�rderung der angewandten Forschung e.V.
6  All rights reserved.
7
8 1.    INTRODUCTION
9The Fraunhofer FDK AAC Codec Library for Android ("FDK AAC Codec") is software that implements
10the MPEG Advanced Audio Coding ("AAC") encoding and decoding scheme for digital audio.
11This FDK AAC Codec software is intended to be used on a wide variety of Android devices.
12
13AAC's HE-AAC and HE-AAC v2 versions are regarded as today's most efficient general perceptual
14audio codecs. AAC-ELD is considered the best-performing full-bandwidth communications codec by
15independent studies and is widely deployed. AAC has been standardized by ISO and IEC as part
16of the MPEG specifications.
17
18Patent licenses for necessary patent claims for the FDK AAC Codec (including those of Fraunhofer)
19may be obtained through Via Licensing (www.vialicensing.com) or through the respective patent owners
20individually for the purpose of encoding or decoding bit streams in products that are compliant with
21the ISO/IEC MPEG audio standards. Please note that most manufacturers of Android devices already license
22these patent claims through Via Licensing or directly from the patent owners, and therefore FDK AAC Codec
23software may already be covered under those patent licenses when it is used for those licensed purposes only.
24
25Commercially-licensed AAC software libraries, including floating-point versions with enhanced sound quality,
26are also available from Fraunhofer. Users are encouraged to check the Fraunhofer website for additional
27applications information and documentation.
28
292.    COPYRIGHT LICENSE
30
31Redistribution and use in source and binary forms, with or without modification, are permitted without
32payment of copyright license fees provided that you satisfy the following conditions:
33
34You must retain the complete text of this software license in redistributions of the FDK AAC Codec or
35your modifications thereto in source code form.
36
37You must retain the complete text of this software license in the documentation and/or other materials
38provided with redistributions of the FDK AAC Codec or your modifications thereto in binary form.
39You must make available free of charge copies of the complete source code of the FDK AAC Codec and your
40modifications thereto to recipients of copies in binary form.
41
42The name of Fraunhofer may not be used to endorse or promote products derived from this library without
43prior written permission.
44
45You may not charge copyright license fees for anyone to use, copy or distribute the FDK AAC Codec
46software or your modifications thereto.
47
48Your modified versions of the FDK AAC Codec must carry prominent notices stating that you changed the software
49and the date of any change. For modified versions of the FDK AAC Codec, the term
50"Fraunhofer FDK AAC Codec Library for Android" must be replaced by the term
51"Third-Party Modified Version of the Fraunhofer FDK AAC Codec Library for Android."
52
533.    NO PATENT LICENSE
54
55NO EXPRESS OR IMPLIED LICENSES TO ANY PATENT CLAIMS, including without limitation the patents of Fraunhofer,
56ARE GRANTED BY THIS SOFTWARE LICENSE. Fraunhofer provides no warranty of patent non-infringement with
57respect to this software.
58
59You may use this FDK AAC Codec software or modifications thereto only for purposes that are authorized
60by appropriate patent licenses.
61
624.    DISCLAIMER
63
64This FDK AAC Codec software is provided by Fraunhofer on behalf of the copyright holders and contributors
65"AS IS" and WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES, including but not limited to the implied warranties
66of merchantability and fitness for a particular purpose. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
67CONTRIBUTORS BE LIABLE for any direct, indirect, incidental, special, exemplary, or consequential damages,
68including but not limited to procurement of substitute goods or services; loss of use, data, or profits,
69or business interruption, however caused and on any theory of liability, whether in contract, strict
70liability, or tort (including negligence), arising in any way out of the use of this software, even if
71advised of the possibility of such damage.
72
735.    CONTACT INFORMATION
74
75Fraunhofer Institute for Integrated Circuits IIS
76Attention: Audio and Multimedia Departments - FDK AAC LL
77Am Wolfsmantel 33
7891058 Erlangen, Germany
79
80www.iis.fraunhofer.de/amm
81amm-info@iis.fraunhofer.de
82----------------------------------------------------------------------------------------------------------- */
83
84/***************************  Fraunhofer IIS FDK Tools  **********************
85
86   Author(s):   Marc Gayer
87   Description: fixed point intrinsics
88
89******************************************************************************/
90
91#if !defined(__CLZ_H__)
92#define __CLZ_H__
93
94#include "FDK_archdef.h"
95#include "machine_type.h"
96
97#if defined(__arm__)
98#include "arm/clz_arm.h"
99
100#elif defined(__mips__)	/* cppp replaced: elif */
101#include "mips/clz_mips.h"
102
103#endif /* all cores */
104
105
106/*************************************************************************
107 *************************************************************************
108    Software fallbacks for missing functions.
109**************************************************************************
110**************************************************************************/
111
112#if !defined(FUNCTION_fixnormz_S)
113#ifdef FUNCTION_fixnormz_D
114inline INT fixnormz_S (SHORT a)
115{
116  return fixnormz_D((INT)(a));
117}
118#else
119inline INT fixnormz_S (SHORT a)
120{
121    int leadingBits = 0;
122    a = ~a;
123    while(a & 0x8000) {
124      leadingBits++;
125      a <<= 1;
126    }
127
128    return (leadingBits);
129}
130#endif
131#endif
132
133#if !defined(FUNCTION_fixnormz_D)
134inline INT fixnormz_D (LONG a)
135{
136    INT leadingBits = 0;
137    a = ~a;
138    while(a & 0x80000000) {
139      leadingBits++;
140      a <<= 1;
141    }
142
143    return (leadingBits);
144}
145#endif
146
147
148/*****************************************************************************
149
150    functionname: fixnorm_D
151    description:  Count leading ones or zeros of operand val for dfract/LONG INT values.
152                  Return this value minus 1. Return 0 if operand==0.
153*****************************************************************************/
154#if !defined(FUNCTION_fixnorm_S)
155#ifdef FUNCTION_fixnorm_D
156inline INT fixnorm_S(FIXP_SGL val)
157{
158  return fixnorm_D((INT)(val));
159}
160#else
161inline INT fixnorm_S(FIXP_SGL val)
162{
163    INT leadingBits = 0;
164    if ( val != (FIXP_SGL)0 ) {
165        if ( val < (FIXP_SGL)0 ) {
166            val = ~val;
167        }
168        leadingBits = fixnormz_S(val) - 1;
169    }
170    return (leadingBits);
171}
172#endif
173#endif
174
175#if !defined(FUNCTION_fixnorm_D)
176inline INT fixnorm_D(FIXP_DBL val)
177{
178    INT leadingBits = 0;
179    if ( val != (FIXP_DBL)0 ) {
180        if ( val < (FIXP_DBL)0 ) {
181            val = ~val;
182        }
183        leadingBits = fixnormz_D(val) - 1;
184    }
185    return (leadingBits);
186}
187#endif
188
189#endif /* __CLZ_H__ */
190