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 /*********************** MPEG surround decoder library *************************
96
97 Author(s):
98
99 Description: SAC Dec parameter smoothing
100
101 *******************************************************************************/
102
103 #include "sac_dec.h"
104 #include "sac_bitdec.h"
105 #include "sac_smoothing.h"
106 #include "sac_rom.h"
107
108 /*******************************************************************************
109 Functionname: calcFilterCoeff
110 *******************************************************************************
111
112 Description:
113
114 Arguments:
115
116 Input:
117
118 Output:
119
120
121 *******************************************************************************/
calcFilterCoeff__FDK(spatialDec * self,int ps,const SPATIAL_BS_FRAME * frame)122 static FIXP_DBL calcFilterCoeff__FDK(spatialDec *self, int ps,
123 const SPATIAL_BS_FRAME *frame) {
124 int dSlots;
125 FIXP_DBL delta;
126
127 dSlots = frame->paramSlot[ps] - self->smoothState->prevParamSlot;
128
129 if (dSlots <= 0) {
130 dSlots += self->timeSlots;
131 }
132
133 delta = fDivNorm(dSlots, self->smgTime[ps]);
134
135 return delta;
136 }
137
138 /*******************************************************************************
139 Functionname: getSmoothOnOff
140 *******************************************************************************
141
142 Description:
143
144 Arguments:
145
146 Input:
147
148 Output:
149
150
151 *******************************************************************************/
getSmoothOnOff(spatialDec * self,int ps,int pb)152 static int getSmoothOnOff(spatialDec *self, int ps, int pb) {
153 int smoothBand = 0;
154
155 smoothBand = self->smgData[ps][pb];
156
157 return smoothBand;
158 }
159
SpatialDecSmoothM1andM2(spatialDec * self,const SPATIAL_BS_FRAME * frame,int ps)160 void SpatialDecSmoothM1andM2(spatialDec *self, const SPATIAL_BS_FRAME *frame,
161 int ps) {
162 FIXP_DBL delta__FDK;
163 FIXP_DBL one_minus_delta__FDK;
164
165 int pb, row, col;
166 int residualBands = 0;
167
168 if (self->residualCoding) {
169 int i;
170 int boxes = self->numOttBoxes;
171 for (i = 0; i < boxes; i++) {
172 if (self->residualBands[i] > residualBands) {
173 residualBands = self->residualBands[i];
174 }
175 }
176 }
177
178 delta__FDK = calcFilterCoeff__FDK(self, ps, frame);
179 if (delta__FDK == /*FL2FXCONST_DBL(1.0f)*/ (FIXP_DBL)MAXVAL_DBL)
180 one_minus_delta__FDK = FL2FXCONST_DBL(0.0f);
181 else if (delta__FDK == FL2FXCONST_DBL(0.0f))
182 one_minus_delta__FDK = /*FL2FXCONST_DBL(1.0f)*/ (FIXP_DBL)MAXVAL_DBL;
183 else
184 one_minus_delta__FDK = (FL2FXCONST_DBL(0.5f) - (delta__FDK >> 1)) << 1;
185
186 for (pb = 0; pb < self->numParameterBands; pb++) {
187 int smoothBand;
188
189 smoothBand = getSmoothOnOff(self, ps, pb);
190
191 if (smoothBand && (pb >= residualBands)) {
192 for (row = 0; row < self->numM2rows; row++) {
193 for (col = 0; col < self->numVChannels; col++) {
194 self->M2Real__FDK[row][col][pb] =
195 ((fMultDiv2(delta__FDK, self->M2Real__FDK[row][col][pb]) +
196 fMultDiv2(one_minus_delta__FDK,
197 self->M2RealPrev__FDK[row][col][pb]))
198 << 1);
199 if (0 || (self->phaseCoding == 3)) {
200 self->M2Imag__FDK[row][col][pb] =
201 ((fMultDiv2(delta__FDK, self->M2Imag__FDK[row][col][pb]) +
202 fMultDiv2(one_minus_delta__FDK,
203 self->M2ImagPrev__FDK[row][col][pb]))
204 << 1);
205 }
206 }
207 }
208 }
209 }
210 self->smoothState->prevParamSlot = frame->paramSlot[ps];
211 }
212
213 /* init states */
initParameterSmoothing(spatialDec * self)214 void initParameterSmoothing(spatialDec *self) {
215 self->smoothState->prevParamSlot = 0;
216 }
217
SpatialDecSmoothOPD(spatialDec * self,const SPATIAL_BS_FRAME * frame,int ps)218 void SpatialDecSmoothOPD(spatialDec *self, const SPATIAL_BS_FRAME *frame,
219 int ps) {
220 int pb;
221 int dSlots;
222 FIXP_DBL delta__FDK;
223 FIXP_DBL one_minus_delta__FDK;
224 FIXP_DBL *phaseLeftSmooth__FDK = self->smoothState->opdLeftState__FDK;
225 FIXP_DBL *phaseRightSmooth__FDK = self->smoothState->opdRightState__FDK;
226 int quantCoarse;
227
228 quantCoarse = frame->IPDLosslessData[0].bsQuantCoarseXXX[ps];
229
230 if (frame->OpdSmoothingMode == 0) {
231 FDKmemcpy(phaseLeftSmooth__FDK, self->PhaseLeft__FDK,
232 self->numParameterBands * sizeof(FIXP_DBL));
233 FDKmemcpy(phaseRightSmooth__FDK, self->PhaseRight__FDK,
234 self->numParameterBands * sizeof(FIXP_DBL));
235 } else {
236 if (ps == 0) {
237 dSlots = frame->paramSlot[ps] + 1;
238 } else {
239 dSlots = frame->paramSlot[ps] - frame->paramSlot[ps - 1];
240 }
241
242 delta__FDK = (FIXP_DBL)((INT)(FL2FXCONST_DBL(0.0078125f)) * dSlots);
243
244 if (delta__FDK == (FIXP_DBL)MAXVAL_DBL /*FL2FXCONST_DBL(1.0f)*/)
245 one_minus_delta__FDK = FL2FXCONST_DBL(0.0f);
246 else if (delta__FDK == FL2FXCONST_DBL(0.0f))
247 one_minus_delta__FDK = (FIXP_DBL)MAXVAL_DBL /*FL2FXCONST_DBL(1.0f)*/;
248 else
249 one_minus_delta__FDK = (FL2FXCONST_DBL(0.5f) - (delta__FDK >> 1)) << 1;
250
251 for (pb = 0; pb < self->numParameterBands; pb++) {
252 FIXP_DBL tmpL, tmpR, tmp;
253
254 tmpL = self->PhaseLeft__FDK[pb];
255 tmpR = self->PhaseRight__FDK[pb];
256
257 while (tmpL > phaseLeftSmooth__FDK[pb] + PI__IPD) tmpL -= PI__IPD << 1;
258 while (tmpL < phaseLeftSmooth__FDK[pb] - PI__IPD) tmpL += PI__IPD << 1;
259 while (tmpR > phaseRightSmooth__FDK[pb] + PI__IPD) tmpR -= PI__IPD << 1;
260 while (tmpR < phaseRightSmooth__FDK[pb] - PI__IPD) tmpR += PI__IPD << 1;
261
262 phaseLeftSmooth__FDK[pb] =
263 fMult(delta__FDK, tmpL) +
264 fMult(one_minus_delta__FDK, phaseLeftSmooth__FDK[pb]);
265 phaseRightSmooth__FDK[pb] =
266 fMult(delta__FDK, tmpR) +
267 fMult(one_minus_delta__FDK, phaseRightSmooth__FDK[pb]);
268
269 tmp = (((tmpL >> 1) - (tmpR >> 1)) - ((phaseLeftSmooth__FDK[pb] >> 1) -
270 (phaseRightSmooth__FDK[pb] >> 1)))
271 << 1;
272 while (tmp > PI__IPD) tmp -= PI__IPD << 1;
273 while (tmp < -PI__IPD) tmp += PI__IPD << 1;
274 if (fixp_abs(tmp) > fMult((quantCoarse ? FL2FXCONST_DBL(50.f / 180.f)
275 : FL2FXCONST_DBL(25.f / 180.f)),
276 PI__IPD)) {
277 phaseLeftSmooth__FDK[pb] = tmpL;
278 phaseRightSmooth__FDK[pb] = tmpR;
279 }
280
281 while (phaseLeftSmooth__FDK[pb] > PI__IPD << 1)
282 phaseLeftSmooth__FDK[pb] -= PI__IPD << 1;
283 while (phaseLeftSmooth__FDK[pb] < (FIXP_DBL)0)
284 phaseLeftSmooth__FDK[pb] += PI__IPD << 1;
285 while (phaseRightSmooth__FDK[pb] > PI__IPD << 1)
286 phaseRightSmooth__FDK[pb] -= PI__IPD << 1;
287 while (phaseRightSmooth__FDK[pb] < (FIXP_DBL)0)
288 phaseRightSmooth__FDK[pb] += PI__IPD << 1;
289
290 self->PhaseLeft__FDK[pb] = phaseLeftSmooth__FDK[pb];
291 self->PhaseRight__FDK[pb] = phaseRightSmooth__FDK[pb];
292 }
293 }
294 return;
295 }
296