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 Initial author: M.Werner
87 contents/description: MS stereo processing
88
89 ******************************************************************************/
90 #include "ms_stereo.h"
91
92 #include "psy_const.h"
93
94 /* static const float scaleMinThres = 1.0f; */ /* 0.75f for 3db boost */
95
FDKaacEnc_MsStereoProcessing(PSY_DATA * RESTRICT psyData[(2)],PSY_OUT_CHANNEL * psyOutChannel[2],const INT * isBook,INT * msDigest,INT * msMask,const INT sfbCnt,const INT sfbPerGroup,const INT maxSfbPerGroup,const INT * sfbOffset)96 void FDKaacEnc_MsStereoProcessing(PSY_DATA *RESTRICT psyData[(2)],
97 PSY_OUT_CHANNEL* psyOutChannel[2],
98 const INT *isBook,
99 INT *msDigest, /* output */
100 INT *msMask, /* output */
101 const INT sfbCnt,
102 const INT sfbPerGroup,
103 const INT maxSfbPerGroup,
104 const INT *sfbOffset)
105 {
106 FIXP_DBL *sfbEnergyLeft = psyData[0]->sfbEnergy.Long; /* modified where msMask==1 */
107 FIXP_DBL *sfbEnergyRight = psyData[1]->sfbEnergy.Long; /* modified where msMask==1 */
108 const FIXP_DBL *sfbEnergyMid = psyData[0]->sfbEnergyMS.Long;
109 const FIXP_DBL *sfbEnergySide = psyData[1]->sfbEnergyMS.Long;
110 FIXP_DBL *sfbThresholdLeft = psyData[0]->sfbThreshold.Long; /* modified where msMask==1 */
111 FIXP_DBL *sfbThresholdRight = psyData[1]->sfbThreshold.Long; /* modified where msMask==1 */
112
113 FIXP_DBL *sfbSpreadEnLeft = psyData[0]->sfbSpreadEnergy.Long;
114 FIXP_DBL *sfbSpreadEnRight = psyData[1]->sfbSpreadEnergy.Long;
115
116 FIXP_DBL *sfbEnergyLeftLdData = psyOutChannel[0]->sfbEnergyLdData; /* modified where msMask==1 */
117 FIXP_DBL *sfbEnergyRightLdData = psyOutChannel[1]->sfbEnergyLdData; /* modified where msMask==1 */
118 FIXP_DBL *sfbEnergyMidLdData = psyData[0]->sfbEnergyMSLdData;
119 FIXP_DBL *sfbEnergySideLdData = psyData[1]->sfbEnergyMSLdData;
120 FIXP_DBL *sfbThresholdLeftLdData = psyOutChannel[0]->sfbThresholdLdData; /* modified where msMask==1 */
121 FIXP_DBL *sfbThresholdRightLdData = psyOutChannel[1]->sfbThresholdLdData; /* modified where msMask==1 */
122
123 FIXP_DBL *mdctSpectrumLeft = psyData[0]->mdctSpectrum; /* modified where msMask==1 */
124 FIXP_DBL *mdctSpectrumRight = psyData[1]->mdctSpectrum; /* modified where msMask==1 */
125
126 INT sfb,sfboffs, j; /* loop counters */
127 FIXP_DBL pnlrLdData, pnmsLdData;
128 FIXP_DBL minThresholdLdData;
129 FIXP_DBL minThreshold;
130 INT useMS;
131
132 INT msMaskTrueSomewhere = 0; /* to determine msDigest */
133 INT numMsMaskFalse = 0; /* number of non-intensity bands where L/R coding is used */
134
135 for(sfb=0; sfb<sfbCnt; sfb+=sfbPerGroup) {
136 for(sfboffs=0;sfboffs<maxSfbPerGroup;sfboffs++) {
137
138 if ( (isBook==NULL) ? 1 : (isBook[sfb+sfboffs] == 0) ) {
139 FIXP_DBL tmp;
140
141 /*
142 minThreshold=min(sfbThresholdLeft[sfb+sfboffs], sfbThresholdRight[sfb+sfboffs])*scaleMinThres;
143 pnlr = (sfbThresholdLeft[sfb+sfboffs]/
144 max(sfbEnergyLeft[sfb+sfboffs],sfbThresholdLeft[sfb+sfboffs]))*
145 (sfbThresholdRight[sfb+sfboffs]/
146 max(sfbEnergyRight[sfb+sfboffs],sfbThresholdRight[sfb+sfboffs]));
147 pnms = (minThreshold/max(sfbEnergyMid[sfb+sfboffs],minThreshold))*
148 (minThreshold/max(sfbEnergySide[sfb+sfboffs],minThreshold));
149 useMS = (pnms > pnlr);
150 */
151
152 /* we assume that scaleMinThres == 1.0f and we can drop it */
153 minThresholdLdData = fixMin(sfbThresholdLeftLdData[sfb+sfboffs], sfbThresholdRightLdData[sfb+sfboffs]);
154
155 /* pnlrLdData = sfbThresholdLeftLdData[sfb+sfboffs] -
156 max(sfbEnergyLeftLdData[sfb+sfboffs], sfbThresholdLeftLdData[sfb+sfboffs]) +
157 sfbThresholdRightLdData[sfb+sfboffs] -
158 max(sfbEnergyRightLdData[sfb+sfboffs], sfbThresholdRightLdData[sfb+sfboffs]); */
159 tmp = fixMax(sfbEnergyLeftLdData[sfb+sfboffs], sfbThresholdLeftLdData[sfb+sfboffs]);
160 pnlrLdData = (sfbThresholdLeftLdData[sfb+sfboffs]>>1) - (tmp>>1);
161 pnlrLdData = pnlrLdData + (sfbThresholdRightLdData[sfb+sfboffs]>>1);
162 tmp = fixMax(sfbEnergyRightLdData[sfb+sfboffs], sfbThresholdRightLdData[sfb+sfboffs]);
163 pnlrLdData = pnlrLdData - (tmp>>1);
164
165 /* pnmsLdData = minThresholdLdData - max(sfbEnergyMidLdData[sfb+sfboffs], minThresholdLdData) +
166 minThresholdLdData - max(sfbEnergySideLdData[sfb+sfboffs], minThresholdLdData); */
167 tmp = fixMax(sfbEnergyMidLdData[sfb+sfboffs], minThresholdLdData);
168 pnmsLdData = minThresholdLdData - (tmp>>1);
169 tmp = fixMax(sfbEnergySideLdData[sfb+sfboffs], minThresholdLdData);
170 pnmsLdData = pnmsLdData - (tmp>>1);
171 useMS = (pnmsLdData > (pnlrLdData));
172
173
174 if (useMS) {
175 msMask[sfb+sfboffs] = 1;
176 msMaskTrueSomewhere = 1;
177 for(j=sfbOffset[sfb+sfboffs]; j<sfbOffset[sfb+sfboffs+1]; j++) {
178 FIXP_DBL specL, specR;
179 specL = mdctSpectrumLeft[j]>>1;
180 specR = mdctSpectrumRight[j]>>1;
181 mdctSpectrumLeft[j] = specL + specR;
182 mdctSpectrumRight[j] = specL - specR;
183 }
184 minThreshold = fixMin(sfbThresholdLeft[sfb+sfboffs], sfbThresholdRight[sfb+sfboffs]);
185 sfbThresholdLeft[sfb+sfboffs] = sfbThresholdRight[sfb+sfboffs] = minThreshold;
186 sfbThresholdLeftLdData[sfb+sfboffs] = sfbThresholdRightLdData[sfb+sfboffs] = minThresholdLdData;
187 sfbEnergyLeft[sfb+sfboffs] = sfbEnergyMid[sfb+sfboffs];
188 sfbEnergyRight[sfb+sfboffs] = sfbEnergySide[sfb+sfboffs];
189 sfbEnergyLeftLdData[sfb+sfboffs] = sfbEnergyMidLdData[sfb+sfboffs];
190 sfbEnergyRightLdData[sfb+sfboffs] = sfbEnergySideLdData[sfb+sfboffs];
191
192 sfbSpreadEnLeft[sfb+sfboffs] = sfbSpreadEnRight[sfb+sfboffs] =
193 fixMin( sfbSpreadEnLeft[sfb+sfboffs],
194 sfbSpreadEnRight[sfb+sfboffs] ) >> 1;
195
196 }
197 else {
198 msMask[sfb+sfboffs] = 0;
199 numMsMaskFalse++;
200 } /* useMS */
201 } /* isBook */
202 else {
203 /* keep mDigest from IS module */
204 if (msMask[sfb+sfboffs]) {
205 msMaskTrueSomewhere = 1;
206 }
207 /* prohibit MS_MASK_ALL in combination with IS */
208 numMsMaskFalse = 9;
209 } /* isBook */
210 } /* sfboffs */
211 } /* sfb */
212
213
214 if(msMaskTrueSomewhere == 1) {
215 if ((numMsMaskFalse == 0) || ((numMsMaskFalse < maxSfbPerGroup) && (numMsMaskFalse < 9))) {
216 *msDigest = SI_MS_MASK_ALL;
217 /* loop through M/S bands; if msMask==0, set it to 1 and apply M/S */
218 for (sfb = 0; sfb < sfbCnt; sfb += sfbPerGroup) {
219 for (sfboffs = 0; sfboffs < maxSfbPerGroup; sfboffs++) {
220 if (( (isBook == NULL) ? 1 : (isBook[sfb+sfboffs] == 0) ) && (msMask[sfb+sfboffs] == 0)) {
221 msMask[sfb+sfboffs] = 1;
222 /* apply M/S coding */
223 for(j=sfbOffset[sfb+sfboffs]; j<sfbOffset[sfb+sfboffs+1]; j++) {
224 FIXP_DBL specL, specR;
225 specL = mdctSpectrumLeft[j]>>1;
226 specR = mdctSpectrumRight[j]>>1;
227 mdctSpectrumLeft[j] = specL + specR;
228 mdctSpectrumRight[j] = specL - specR;
229 }
230 minThreshold = fixMin(sfbThresholdLeft[sfb+sfboffs], sfbThresholdRight[sfb+sfboffs]);
231 sfbThresholdLeft[sfb+sfboffs] = sfbThresholdRight[sfb+sfboffs] = minThreshold;
232 minThresholdLdData = fixMin(sfbThresholdLeftLdData[sfb+sfboffs], sfbThresholdRightLdData[sfb+sfboffs]);
233 sfbThresholdLeftLdData[sfb+sfboffs] = sfbThresholdRightLdData[sfb+sfboffs] = minThresholdLdData;
234 sfbEnergyLeft[sfb+sfboffs] = sfbEnergyMid[sfb+sfboffs];
235 sfbEnergyRight[sfb+sfboffs] = sfbEnergySide[sfb+sfboffs];
236 sfbEnergyLeftLdData[sfb+sfboffs] = sfbEnergyMidLdData[sfb+sfboffs];
237 sfbEnergyRightLdData[sfb+sfboffs] = sfbEnergySideLdData[sfb+sfboffs];
238
239 sfbSpreadEnLeft[sfb+sfboffs] = sfbSpreadEnRight[sfb+sfboffs] =
240 fixMin( sfbSpreadEnLeft[sfb+sfboffs],
241 sfbSpreadEnRight[sfb+sfboffs] ) >> 1;
242 }
243 }
244 }
245 } else {
246 *msDigest = SI_MS_MASK_SOME;
247 }
248 } else {
249 *msDigest = SI_MS_MASK_NONE;
250 }
251 }
252