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. Werner
98
99 Description: Convert chaos measure to the tonality index
100
101 *******************************************************************************/
102
103 #include "tonality.h"
104
105 #include "chaosmeasure.h"
106
107 #if defined(__arm__)
108 #endif
109
110 static const FIXP_DBL normlog =
111 (FIXP_DBL)0xd977d949; /*FL2FXCONST_DBL(-0.4342944819f *
112 FDKlog(2.0)/FDKlog(2.7182818)); */
113
114 static void FDKaacEnc_CalcSfbTonality(FIXP_DBL *RESTRICT spectrum,
115 INT *RESTRICT sfbMaxScaleSpec,
116 FIXP_DBL *RESTRICT chaosMeasure,
117 FIXP_SGL *RESTRICT sfbTonality,
118 INT sfbCnt, const INT *RESTRICT sfbOffset,
119 FIXP_DBL *RESTRICT sfbEnergyLD64);
120
FDKaacEnc_CalculateFullTonality(FIXP_DBL * RESTRICT spectrum,INT * RESTRICT sfbMaxScaleSpec,FIXP_DBL * RESTRICT sfbEnergyLD64,FIXP_SGL * RESTRICT sfbTonality,INT sfbCnt,const INT * sfbOffset,INT usePns)121 void FDKaacEnc_CalculateFullTonality(FIXP_DBL *RESTRICT spectrum,
122 INT *RESTRICT sfbMaxScaleSpec,
123 FIXP_DBL *RESTRICT sfbEnergyLD64,
124 FIXP_SGL *RESTRICT sfbTonality, INT sfbCnt,
125 const INT *sfbOffset, INT usePns) {
126 INT j;
127 INT numberOfLines = sfbOffset[sfbCnt];
128
129 if (usePns) {
130 C_ALLOC_SCRATCH_START(chaosMeasurePerLine, FIXP_DBL, (1024))
131
132 /* calculate chaos measure */
133 FDKaacEnc_CalculateChaosMeasure(spectrum, numberOfLines,
134 chaosMeasurePerLine);
135
136 /* smooth ChaosMeasure */
137 FIXP_DBL left = chaosMeasurePerLine[0];
138 FIXP_DBL right;
139 for (j = 1; j < (numberOfLines - 1); j += 2) {
140 right = chaosMeasurePerLine[j];
141 right = right - (right >> 2);
142 left = right + (left >> 2);
143 chaosMeasurePerLine[j] = left; /* 0.25 left + 0.75 right */
144
145 right = chaosMeasurePerLine[j + 1];
146 right = right - (right >> 2);
147 left = right + (left >> 2);
148 chaosMeasurePerLine[j + 1] = left;
149 }
150 if (j == (numberOfLines - 1)) {
151 right = chaosMeasurePerLine[j];
152 right = right - (right >> 2);
153 left = right + (left >> 2);
154 chaosMeasurePerLine[j] = left;
155 }
156
157 FDKaacEnc_CalcSfbTonality(spectrum, sfbMaxScaleSpec, chaosMeasurePerLine,
158 sfbTonality, sfbCnt, sfbOffset, sfbEnergyLD64);
159
160 C_ALLOC_SCRATCH_END(chaosMeasurePerLine, FIXP_DBL, (1024))
161 }
162 }
163
164 /*****************************************************************************
165
166 functionname: CalculateTonalityIndex
167 description: computes tonality values out of unpredictability values
168 limits range and computes log()
169 returns:
170 input: ptr to energies, ptr to chaos measure values,
171 number of sfb
172 output: sfb wise tonality values
173
174 *****************************************************************************/
FDKaacEnc_CalcSfbTonality(FIXP_DBL * RESTRICT spectrum,INT * RESTRICT sfbMaxScaleSpec,FIXP_DBL * RESTRICT chaosMeasure,FIXP_SGL * RESTRICT sfbTonality,INT sfbCnt,const INT * RESTRICT sfbOffset,FIXP_DBL * RESTRICT sfbEnergyLD64)175 static void FDKaacEnc_CalcSfbTonality(FIXP_DBL *RESTRICT spectrum,
176 INT *RESTRICT sfbMaxScaleSpec,
177 FIXP_DBL *RESTRICT chaosMeasure,
178 FIXP_SGL *RESTRICT sfbTonality,
179 INT sfbCnt, const INT *RESTRICT sfbOffset,
180 FIXP_DBL *RESTRICT sfbEnergyLD64) {
181 INT i;
182
183 for (i = 0; i < sfbCnt; i++) {
184 FIXP_DBL chaosMeasureSfbLD64;
185 INT shiftBits =
186 fixMax(0, sfbMaxScaleSpec[i] -
187 4); /* max sfbWidth = 96 ; 2^7=128 => 7/2 = 4 (spc*spc) */
188
189 INT j;
190 FIXP_DBL chaosMeasureSfb = FL2FXCONST_DBL(0.0);
191
192 /* calc chaosMeasurePerSfb */
193 for (j = (sfbOffset[i + 1] - sfbOffset[i]) - 1; j >= 0; j--) {
194 FIXP_DBL tmp = (*spectrum++) << shiftBits;
195 FIXP_DBL lineNrg = fMultDiv2(tmp, tmp);
196 chaosMeasureSfb = fMultAddDiv2(chaosMeasureSfb, lineNrg, *chaosMeasure++);
197 }
198
199 /* calc tonalityPerSfb */
200 if (chaosMeasureSfb != FL2FXCONST_DBL(0.0)) {
201 /* add ld(convtone)/64 and 2/64 bec.fMultDiv2 */
202 chaosMeasureSfbLD64 = CalcLdData((chaosMeasureSfb)) - sfbEnergyLD64[i];
203 chaosMeasureSfbLD64 += FL2FXCONST_DBL(3.0f / 64) -
204 ((FIXP_DBL)(shiftBits) << (DFRACT_BITS - 6));
205
206 if (chaosMeasureSfbLD64 >
207 FL2FXCONST_DBL(-0.0519051)) /* > ld(0.05)+ld(2) */
208 {
209 if (chaosMeasureSfbLD64 <= FL2FXCONST_DBL(0.0))
210 sfbTonality[i] =
211 FX_DBL2FX_SGL(fMultDiv2(chaosMeasureSfbLD64, normlog) << 7);
212 else
213 sfbTonality[i] = FL2FXCONST_SGL(0.0);
214 } else
215 sfbTonality[i] = (FIXP_SGL)MAXVAL_SGL;
216 } else
217 sfbTonality[i] = (FIXP_SGL)MAXVAL_SGL;
218 }
219 }
220