1
2 /* -----------------------------------------------------------------------------------------------------------
3 Software License for The Fraunhofer FDK AAC Codec Library for Android
4
5 � Copyright 1995 - 2013 Fraunhofer-Gesellschaft zur F�rderung der angewandten Forschung e.V.
6 All rights reserved.
7
8 1. INTRODUCTION
9 The Fraunhofer FDK AAC Codec Library for Android ("FDK AAC Codec") is software that implements
10 the MPEG Advanced Audio Coding ("AAC") encoding and decoding scheme for digital audio.
11 This FDK AAC Codec software is intended to be used on a wide variety of Android devices.
12
13 AAC's HE-AAC and HE-AAC v2 versions are regarded as today's most efficient general perceptual
14 audio codecs. AAC-ELD is considered the best-performing full-bandwidth communications codec by
15 independent studies and is widely deployed. AAC has been standardized by ISO and IEC as part
16 of the MPEG specifications.
17
18 Patent licenses for necessary patent claims for the FDK AAC Codec (including those of Fraunhofer)
19 may be obtained through Via Licensing (www.vialicensing.com) or through the respective patent owners
20 individually for the purpose of encoding or decoding bit streams in products that are compliant with
21 the ISO/IEC MPEG audio standards. Please note that most manufacturers of Android devices already license
22 these patent claims through Via Licensing or directly from the patent owners, and therefore FDK AAC Codec
23 software may already be covered under those patent licenses when it is used for those licensed purposes only.
24
25 Commercially-licensed AAC software libraries, including floating-point versions with enhanced sound quality,
26 are also available from Fraunhofer. Users are encouraged to check the Fraunhofer website for additional
27 applications information and documentation.
28
29 2. COPYRIGHT LICENSE
30
31 Redistribution and use in source and binary forms, with or without modification, are permitted without
32 payment of copyright license fees provided that you satisfy the following conditions:
33
34 You must retain the complete text of this software license in redistributions of the FDK AAC Codec or
35 your modifications thereto in source code form.
36
37 You must retain the complete text of this software license in the documentation and/or other materials
38 provided with redistributions of the FDK AAC Codec or your modifications thereto in binary form.
39 You must make available free of charge copies of the complete source code of the FDK AAC Codec and your
40 modifications thereto to recipients of copies in binary form.
41
42 The name of Fraunhofer may not be used to endorse or promote products derived from this library without
43 prior written permission.
44
45 You may not charge copyright license fees for anyone to use, copy or distribute the FDK AAC Codec
46 software or your modifications thereto.
47
48 Your modified versions of the FDK AAC Codec must carry prominent notices stating that you changed the software
49 and 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
53 3. NO PATENT LICENSE
54
55 NO EXPRESS OR IMPLIED LICENSES TO ANY PATENT CLAIMS, including without limitation the patents of Fraunhofer,
56 ARE GRANTED BY THIS SOFTWARE LICENSE. Fraunhofer provides no warranty of patent non-infringement with
57 respect to this software.
58
59 You may use this FDK AAC Codec software or modifications thereto only for purposes that are authorized
60 by appropriate patent licenses.
61
62 4. DISCLAIMER
63
64 This 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
66 of merchantability and fitness for a particular purpose. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
67 CONTRIBUTORS BE LIABLE for any direct, indirect, incidental, special, exemplary, or consequential damages,
68 including but not limited to procurement of substitute goods or services; loss of use, data, or profits,
69 or business interruption, however caused and on any theory of liability, whether in contract, strict
70 liability, or tort (including negligence), arising in any way out of the use of this software, even if
71 advised of the possibility of such damage.
72
73 5. CONTACT INFORMATION
74
75 Fraunhofer Institute for Integrated Circuits IIS
76 Attention: Audio and Multimedia Departments - FDK AAC LL
77 Am Wolfsmantel 33
78 91058 Erlangen, Germany
79
80 www.iis.fraunhofer.de/amm
81 amm-info@iis.fraunhofer.de
82 ----------------------------------------------------------------------------------------------------------- */
83
84 /******************************** MPEG Audio Encoder **************************
85
86 author: M. Werner
87 contents/description: Convert chaos measure to the tonality index
88
89 ******************************************************************************/
90
91 #include "tonality.h"
92 #include "chaosmeasure.h"
93
94 static const FIXP_DBL normlog = (FIXP_DBL)0xd977d949; /*FL2FXCONST_DBL(-0.4342944819f * FDKlog(2.0)/FDKlog(2.7182818)); */
95
96 static void FDKaacEnc_CalcSfbTonality(FIXP_DBL *RESTRICT spectrum,
97 INT *RESTRICT sfbMaxScaleSpec,
98 FIXP_DBL *RESTRICT chaosMeasure,
99 FIXP_SGL *RESTRICT sfbTonality,
100 INT sfbCnt,
101 const INT *RESTRICT sfbOffset,
102 FIXP_DBL *RESTRICT sfbEnergyLD64 );
103
104
FDKaacEnc_CalculateFullTonality(FIXP_DBL * RESTRICT spectrum,INT * RESTRICT sfbMaxScaleSpec,FIXP_DBL * RESTRICT sfbEnergyLD64,FIXP_SGL * RESTRICT sfbTonality,INT sfbCnt,const INT * sfbOffset,INT usePns)105 void FDKaacEnc_CalculateFullTonality(FIXP_DBL *RESTRICT spectrum,
106 INT *RESTRICT sfbMaxScaleSpec,
107 FIXP_DBL *RESTRICT sfbEnergyLD64,
108 FIXP_SGL *RESTRICT sfbTonality,
109 INT sfbCnt,
110 const INT *sfbOffset,
111 INT usePns)
112 {
113 INT j;
114 #if defined(ARCH_PREFER_MULT_32x16)
115 FIXP_SGL alpha_0 = FL2FXCONST_SGL(0.25f); /* used in smooth ChaosMeasure */
116 FIXP_SGL alpha_1 = FL2FXCONST_SGL(1.0f-0.25f); /* used in smooth ChaosMeasure */
117 #else
118 FIXP_DBL alpha_0 = FL2FXCONST_DBL(0.25f); /* used in smooth ChaosMeasure */
119 FIXP_DBL alpha_1 = FL2FXCONST_DBL(1.0f-0.25f); /* used in smooth ChaosMeasure */
120 #endif
121 INT numberOfLines = sfbOffset[sfbCnt];
122
123 if (!usePns)
124 return;
125
126 C_ALLOC_SCRATCH_START(chaosMeasurePerLine, FIXP_DBL, (1024));
127 /* calculate chaos measure */
128 FDKaacEnc_CalculateChaosMeasure(spectrum,
129 numberOfLines,
130 chaosMeasurePerLine);
131
132 /* smooth ChaosMeasure */
133 for (j=1;j<numberOfLines;j++) {
134 FIXP_DBL tmp = fMultDiv2(alpha_1, chaosMeasurePerLine[j]);
135 chaosMeasurePerLine[j] = fMultAdd(tmp, alpha_0, chaosMeasurePerLine[j-1]);
136 }
137
138 FDKaacEnc_CalcSfbTonality(spectrum,
139 sfbMaxScaleSpec,
140 chaosMeasurePerLine,
141 sfbTonality,
142 sfbCnt,
143 sfbOffset,
144 sfbEnergyLD64);
145
146 C_ALLOC_SCRATCH_END(chaosMeasurePerLine, FIXP_DBL, (1024));
147 }
148
149
150 /*****************************************************************************
151
152 functionname: CalculateTonalityIndex
153 description: computes tonality values out of unpredictability values
154 limits range and computes log()
155 returns:
156 input: ptr to energies, ptr to chaos measure values,
157 number of sfb
158 output: sfb wise tonality values
159
160 *****************************************************************************/
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)161 static void FDKaacEnc_CalcSfbTonality(FIXP_DBL *RESTRICT spectrum,
162 INT *RESTRICT sfbMaxScaleSpec,
163 FIXP_DBL *RESTRICT chaosMeasure,
164 FIXP_SGL *RESTRICT sfbTonality,
165 INT sfbCnt,
166 const INT *RESTRICT sfbOffset,
167 FIXP_DBL *RESTRICT sfbEnergyLD64 )
168 {
169 INT i, j;
170
171 for (i=0; i<sfbCnt; i++) {
172 FIXP_DBL chaosMeasureSfbLD64;
173 INT shiftBits = fixMax(0,sfbMaxScaleSpec[i] - 4); /* max sfbWidth = 96 ; 2^7=128 => 7/2 = 4 (spc*spc) */
174
175 FIXP_DBL chaosMeasureSfb = FL2FXCONST_DBL(0.0);
176
177 /* calc chaosMeasurePerSfb */
178 for (j=(sfbOffset[i+1]-sfbOffset[i])-1; j>=0; j--) {
179 FIXP_DBL tmp = (*spectrum++)<<shiftBits;
180 FIXP_DBL lineNrg = fMultDiv2(tmp, tmp);
181 chaosMeasureSfb = fMultAddDiv2(chaosMeasureSfb, lineNrg, *chaosMeasure++);
182 }
183
184 /* calc tonalityPerSfb */
185 if (chaosMeasureSfb != FL2FXCONST_DBL(0.0))
186 {
187 /* add ld(convtone)/64 and 2/64 bec.fMultDiv2 */
188 chaosMeasureSfbLD64 = CalcLdData((chaosMeasureSfb)) - sfbEnergyLD64[i];
189 chaosMeasureSfbLD64 += FL2FXCONST_DBL(3.0f/64) - ((FIXP_DBL)(shiftBits)<<(DFRACT_BITS-6));
190
191 if (chaosMeasureSfbLD64 > FL2FXCONST_DBL(-0.0519051) ) /* > ld(0.05)+ld(2) */
192 {
193 if (chaosMeasureSfbLD64 <= FL2FXCONST_DBL(0.0) )
194 sfbTonality[i] = FX_DBL2FX_SGL(fMultDiv2( chaosMeasureSfbLD64 , normlog ) << 7);
195 else
196 sfbTonality[i] = FL2FXCONST_SGL(0.0);
197 }
198 else
199 sfbTonality[i] = (FIXP_SGL)MAXVAL_SGL;
200 }
201 else
202 sfbTonality[i] = (FIXP_SGL)MAXVAL_SGL;
203 }
204 }
205