1 /* -----------------------------------------------------------------------------
2 Software License for The Fraunhofer FDK AAC Codec Library for Android
3 
4 © Copyright  1995 - 2018 Fraunhofer-Gesellschaft zur Förderung der angewandten
5 Forschung e.V. All rights reserved.
6 
7  1.    INTRODUCTION
8 The Fraunhofer FDK AAC Codec Library for Android ("FDK AAC Codec") is software
9 that implements the MPEG Advanced Audio Coding ("AAC") encoding and decoding
10 scheme for digital audio. This FDK AAC Codec software is intended to be used on
11 a wide variety of Android devices.
12 
13 AAC's HE-AAC and HE-AAC v2 versions are regarded as today's most efficient
14 general perceptual audio codecs. AAC-ELD is considered the best-performing
15 full-bandwidth communications codec by independent studies and is widely
16 deployed. AAC has been standardized by ISO and IEC as part of the MPEG
17 specifications.
18 
19 Patent licenses for necessary patent claims for the FDK AAC Codec (including
20 those of Fraunhofer) may be obtained through Via Licensing
21 (www.vialicensing.com) or through the respective patent owners individually for
22 the purpose of encoding or decoding bit streams in products that are compliant
23 with the ISO/IEC MPEG audio standards. Please note that most manufacturers of
24 Android devices already license these patent claims through Via Licensing or
25 directly from the patent owners, and therefore FDK AAC Codec software may
26 already be covered under those patent licenses when it is used for those
27 licensed purposes only.
28 
29 Commercially-licensed AAC software libraries, including floating-point versions
30 with enhanced sound quality, are also available from Fraunhofer. Users are
31 encouraged to check the Fraunhofer website for additional applications
32 information and documentation.
33 
34 2.    COPYRIGHT LICENSE
35 
36 Redistribution and use in source and binary forms, with or without modification,
37 are permitted without payment of copyright license fees provided that you
38 satisfy the following conditions:
39 
40 You must retain the complete text of this software license in redistributions of
41 the FDK AAC Codec or your modifications thereto in source code form.
42 
43 You must retain the complete text of this software license in the documentation
44 and/or other materials provided with redistributions of the FDK AAC Codec or
45 your modifications thereto in binary form. You must make available free of
46 charge copies of the complete source code of the FDK AAC Codec and your
47 modifications thereto to recipients of copies in binary form.
48 
49 The name of Fraunhofer may not be used to endorse or promote products derived
50 from this library without prior written permission.
51 
52 You may not charge copyright license fees for anyone to use, copy or distribute
53 the FDK AAC Codec software or your modifications thereto.
54 
55 Your modified versions of the FDK AAC Codec must carry prominent notices stating
56 that you changed the software and the date of any change. For modified versions
57 of the FDK AAC Codec, the term "Fraunhofer FDK AAC Codec Library for Android"
58 must be replaced by the term "Third-Party Modified Version of the Fraunhofer FDK
59 AAC Codec Library for Android."
60 
61 3.    NO PATENT LICENSE
62 
63 NO EXPRESS OR IMPLIED LICENSES TO ANY PATENT CLAIMS, including without
64 limitation the patents of Fraunhofer, ARE GRANTED BY THIS SOFTWARE LICENSE.
65 Fraunhofer provides no warranty of patent non-infringement with respect to this
66 software.
67 
68 You may use this FDK AAC Codec software or modifications thereto only for
69 purposes that are authorized by appropriate patent licenses.
70 
71 4.    DISCLAIMER
72 
73 This FDK AAC Codec software is provided by Fraunhofer on behalf of the copyright
74 holders and contributors "AS IS" and WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES,
75 including but not limited to the implied warranties of merchantability and
76 fitness for a particular purpose. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
77 CONTRIBUTORS BE LIABLE for any direct, indirect, incidental, special, exemplary,
78 or consequential damages, including but not limited to procurement of substitute
79 goods or services; loss of use, data, or profits, or business interruption,
80 however caused and on any theory of liability, whether in contract, strict
81 liability, or tort (including negligence), arising in any way out of the use of
82 this software, even if advised of the possibility of such damage.
83 
84 5.    CONTACT INFORMATION
85 
86 Fraunhofer Institute for Integrated Circuits IIS
87 Attention: Audio and Multimedia Departments - FDK AAC LL
88 Am Wolfsmantel 33
89 91058 Erlangen, Germany
90 
91 www.iis.fraunhofer.de/amm
92 amm-info@iis.fraunhofer.de
93 ----------------------------------------------------------------------------- */
94 
95 /**************************** AAC encoder library ******************************
96 
97    Author(s):   M. Schug / A. Groeschel
98 
99    Description: threshold calculations
100 
101 *******************************************************************************/
102 
103 #ifndef ADJ_THR_DATA_H
104 #define ADJ_THR_DATA_H
105 
106 #include "psy_const.h"
107 
108 typedef enum {
109   AACENC_BD_MODE_INTER_ELEMENT = 0,
110   AACENC_BD_MODE_INTRA_ELEMENT = 1
111 } AACENC_BIT_DISTRIBUTION_MODE;
112 
113 typedef enum {
114   AACENC_BR_MODE_FULL = 0,
115   AACENC_BR_MODE_REDUCED = 1,
116   AACENC_BR_MODE_DISABLED = 2
117 } AACENC_BITRES_MODE;
118 
119 typedef struct {
120   FIXP_DBL clipSaveLow, clipSaveHigh;
121   FIXP_DBL minBitSave, maxBitSave;
122   FIXP_DBL clipSpendLow, clipSpendHigh;
123   FIXP_DBL minBitSpend, maxBitSpend;
124 } BRES_PARAM;
125 
126 typedef struct {
127   INT modifyMinSnr;
128   INT startSfbL, startSfbS;
129 } AH_PARAM;
130 
131 typedef struct {
132   FIXP_DBL maxRed;
133   FIXP_DBL startRatio;
134   FIXP_DBL maxRatio;
135   FIXP_DBL redRatioFac;
136   FIXP_DBL redOffs;
137 } MINSNR_ADAPT_PARAM;
138 
139 typedef struct {
140   /* parameters for bitreservoir control */
141   INT peMin, peMax;
142   /* constant offset to pe               */
143   INT peOffset;
144   /* constant PeFactor */
145   FIXP_DBL bits2PeFactor_m;
146   INT bits2PeFactor_e;
147   /* avoid hole parameters               */
148   AH_PARAM ahParam;
149   /* parameters for adaptation of minSnr */
150   MINSNR_ADAPT_PARAM minSnrAdaptParam;
151 
152   /* values for correction of pe */
153   INT peLast;
154   INT dynBitsLast;
155   FIXP_DBL peCorrectionFactor_m;
156   INT peCorrectionFactor_e;
157 
158   /* vbr encoding */
159   FIXP_DBL vbrQualFactor;
160   FIXP_DBL chaosMeasureOld;
161 
162   /* threshold weighting */
163   FIXP_DBL chaosMeasureEnFac[(2)];
164   INT lastEnFacPatch[(2)];
165 
166 } ATS_ELEMENT;
167 
168 typedef struct {
169   BRES_PARAM bresParamLong, bresParamShort;
170   ATS_ELEMENT* adjThrStateElem[((8))];
171   AACENC_BIT_DISTRIBUTION_MODE bitDistributionMode;
172   INT maxIter2ndGuess;
173 } ADJ_THR_STATE;
174 
175 #endif
176