1
2/* -----------------------------------------------------------------------------------------------------------
3Software 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
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/******************************** 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
94static const FIXP_DBL normlog = (FIXP_DBL)0xd977d949; /*FL2FXCONST_DBL(-0.4342944819f * FDKlog(2.0)/FDKlog(2.7182818)); */
95
96static 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
105void 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*****************************************************************************/
161static 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