1
2 /* -----------------------------------------------------------------------------------------------------------
3 Software License for The Fraunhofer FDK AAC Codec Library for Android
4
5 � Copyright 1995 - 2012 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.Lohwasser
87 contents/description: PNS parameters depending on bitrate and bandwidth
88
89 ******************************************************************************/
90
91 #include "pnsparam.h"
92 #include "psy_configuration.h"
93
94 typedef struct {
95 SHORT startFreq;
96 /* Parameters for detection */
97 FIXP_SGL refPower;
98 FIXP_SGL refTonality;
99 SHORT tnsGainThreshold; /* scaled by TNS_PREDGAIN_SCALE (=1000) */
100 SHORT tnsPNSGainThreshold; /* scaled by TNS_PREDGAIN_SCALE (=1000) */
101 FIXP_SGL gapFillThr;
102 SHORT minSfbWidth;
103 USHORT detectionAlgorithmFlags;
104 } PNS_INFO_TAB;
105
106
107 typedef struct {
108 ULONG brFrom;
109 ULONG brTo;
110 UCHAR S22050;
111 UCHAR S24000;
112 UCHAR S32000;
113 UCHAR S44100;
114 UCHAR S48000;
115 } AUTO_PNS_TAB;
116
117 static const AUTO_PNS_TAB levelTable_mono[]= {
118 {0, 11999, 1, 1, 1, 1, 1,},
119 {12000, 19999, 1, 1, 1, 1, 1,},
120 {20000, 28999, 2, 1, 1, 1, 1,},
121 {29000, 40999, 4, 4, 4, 2, 2,},
122 {41000, 55999, 9, 9, 7, 7, 7,},
123 {56000, 79999, 0, 0, 0, 9, 9,},
124 {80000, 99999, 0, 0, 0, 0, 0,},
125 {100000,999999, 0, 0, 0, 0, 0,},
126 };
127
128 static const AUTO_PNS_TAB levelTable_stereo[]= {
129 {0, 11999, 1, 1, 1, 1, 1,},
130 {12000, 19999, 3, 1, 1, 1, 1,},
131 {20000, 28999, 3, 3, 3, 2, 2,},
132 {29000, 40999, 7, 6, 6, 5, 5,},
133 {41000, 55999, 9, 9, 7, 7, 7,},
134 {56000, 79999, 0, 0, 0, 0, 0,},
135 {80000, 99999, 0, 0, 0, 0, 0,},
136 {100000,999999, 0, 0, 0, 0, 0,},
137 };
138
139
140 static const PNS_INFO_TAB pnsInfoTab[] = {
141 /*0 pns off */
142 /*1*/ { 4000, FL2FXCONST_SGL(0.04), FL2FXCONST_SGL(0.06), 1150, 1200, FL2FXCONST_SGL(0.02), 8,
143 USE_POWER_DISTRIBUTION | USE_PSYCH_TONALITY | USE_TNS_GAIN_THR | USE_TNS_PNS /*| JUST_LONG_WINDOW*/ },
144 /*2*/ { 4000, FL2FXCONST_SGL(0.04), FL2FXCONST_SGL(0.07), 1130, 1300, FL2FXCONST_SGL(0.05), 8,
145 USE_POWER_DISTRIBUTION | USE_PSYCH_TONALITY | USE_TNS_GAIN_THR | USE_TNS_PNS /*| JUST_LONG_WINDOW*/ },
146 /*3*/ { 4100, FL2FXCONST_SGL(0.04), FL2FXCONST_SGL(0.07), 1100, 1400, FL2FXCONST_SGL(0.10), 8,
147 USE_POWER_DISTRIBUTION | USE_PSYCH_TONALITY | USE_TNS_GAIN_THR | USE_TNS_PNS /*| JUST_LONG_WINDOW*/ },
148 /*4*/ { 4100, FL2FXCONST_SGL(0.03), FL2FXCONST_SGL(0.10), 1100, 1400, FL2FXCONST_SGL(0.15), 8,
149 USE_POWER_DISTRIBUTION | USE_PSYCH_TONALITY | USE_TNS_GAIN_THR | USE_TNS_PNS /*| JUST_LONG_WINDOW*/ },
150 /*5*/ { 4300, FL2FXCONST_SGL(0.03), FL2FXCONST_SGL(0.10), 1100, 1400, FL2FXCONST_SGL(0.15), 8,
151 USE_POWER_DISTRIBUTION | USE_PSYCH_TONALITY | USE_TNS_GAIN_THR | USE_TNS_PNS | JUST_LONG_WINDOW },
152 /*6*/ { 5000, FL2FXCONST_SGL(0.03), FL2FXCONST_SGL(0.10), 1100, 1400, FL2FXCONST_SGL(0.25), 8,
153 USE_POWER_DISTRIBUTION | USE_PSYCH_TONALITY | USE_TNS_GAIN_THR | USE_TNS_PNS | JUST_LONG_WINDOW },
154 /*7*/ { 5500, FL2FXCONST_SGL(0.03), FL2FXCONST_SGL(0.12), 1100, 1400, FL2FXCONST_SGL(0.35), 8,
155 USE_POWER_DISTRIBUTION | USE_PSYCH_TONALITY | USE_TNS_GAIN_THR | USE_TNS_PNS | JUST_LONG_WINDOW },
156 /*8*/ { 6000, FL2FXCONST_SGL(0.03), FL2FXCONST_SGL(0.12), 1080, 1400, FL2FXCONST_SGL(0.40), 8,
157 USE_POWER_DISTRIBUTION | USE_PSYCH_TONALITY | USE_TNS_GAIN_THR | USE_TNS_PNS | JUST_LONG_WINDOW },
158 /*9*/ { 6000, FL2FXCONST_SGL(0.03), FL2FXCONST_SGL(0.14), 1070, 1400, FL2FXCONST_SGL(0.45), 8,
159 USE_POWER_DISTRIBUTION | USE_PSYCH_TONALITY | USE_TNS_GAIN_THR | USE_TNS_PNS | JUST_LONG_WINDOW },
160 };
161
162 static const AUTO_PNS_TAB levelTable_lowComplexity[]= {
163 {0, 27999, 0, 0, 0, 0, 0,},
164 {28000, 31999, 2, 2, 2, 2, 2,},
165 {32000, 47999, 3, 3, 3, 3, 3,},
166 {48000, 48000, 4, 4, 4, 4, 4,},
167 {48001, 999999, 0, 0, 0, 0, 0,},
168 };
169
170 /* conversion of old LC tuning tables to new (LD enc) structure (only entries which are actually used were converted) */
171 static const PNS_INFO_TAB pnsInfoTab_lowComplexity[] = {
172 /*0 pns off */
173 /* DEFAULT parameter set */
174 /*1*/ { 4100, FL2FXCONST_SGL(0.03), FL2FXCONST_SGL(0.16), 1100, 1400, FL2FXCONST_SGL(0.5), 16,
175 USE_POWER_DISTRIBUTION | USE_PSYCH_TONALITY | USE_TNS_GAIN_THR | USE_TNS_PNS | JUST_LONG_WINDOW },
176 /*2*/ { 4100, FL2FXCONST_SGL(0.05), FL2FXCONST_SGL(0.10), 1410, 1400, FL2FXCONST_SGL(0.5), 16,
177 USE_POWER_DISTRIBUTION | USE_PSYCH_TONALITY | USE_TNS_GAIN_THR | USE_TNS_PNS | JUST_LONG_WINDOW },
178 /*3*/ { 4100, FL2FXCONST_SGL(0.05), FL2FXCONST_SGL(0.10), 1100, 1400, FL2FXCONST_SGL(0.5), 16,
179 USE_POWER_DISTRIBUTION | USE_PSYCH_TONALITY | USE_TNS_GAIN_THR | USE_TNS_PNS | JUST_LONG_WINDOW },
180 /* LOWSUBST -> PNS is used less often than with DEFAULT parameter set (for br: 48000 - 79999) */
181 /*4*/ { 4100, FL2FXCONST_SGL(0.20), FL2FXCONST_SGL(0.10), 1410, 1400, FL2FXCONST_SGL(0.5), 16,
182 USE_POWER_DISTRIBUTION | USE_PSYCH_TONALITY | USE_TNS_GAIN_THR | USE_TNS_PNS | JUST_LONG_WINDOW },
183 };
184
185 /****************************************************************************
186 function to look up used pns level
187 ****************************************************************************/
FDKaacEnc_lookUpPnsUse(int bitRate,int sampleRate,int numChan,const int isLC)188 int FDKaacEnc_lookUpPnsUse (int bitRate, int sampleRate, int numChan, const int isLC) {
189
190 int hUsePns=0, size, i;
191 const AUTO_PNS_TAB *levelTable;
192
193 if (isLC) {
194 levelTable = &levelTable_lowComplexity[0];
195 size = sizeof(levelTable_lowComplexity);
196 } else
197 { /* (E)LD */
198 levelTable = (numChan > 1) ? &levelTable_stereo[0] : &levelTable_mono[0];
199 size = (numChan > 1) ? sizeof(levelTable_stereo) : sizeof(levelTable_mono);
200 }
201
202 for(i = 0; i < (int) (size/sizeof(AUTO_PNS_TAB)); i++) {
203 if(((ULONG)bitRate >= levelTable[i].brFrom) &&
204 ((ULONG)bitRate <= levelTable[i].brTo) )
205 break;
206 }
207
208 /* sanity check */
209 if ((int)(sizeof(pnsInfoTab)/sizeof(PNS_INFO_TAB)) < i ) {
210 return (PNS_TABLE_ERROR);
211 }
212
213 switch (sampleRate) {
214 case 22050: hUsePns = levelTable[i].S22050; break;
215 case 24000: hUsePns = levelTable[i].S24000; break;
216 case 32000: hUsePns = levelTable[i].S32000; break;
217 case 44100: hUsePns = levelTable[i].S44100; break;
218 case 48000: hUsePns = levelTable[i].S48000; break;
219 default:
220 if (isLC) {
221 hUsePns = levelTable[i].S48000;
222 }
223 break;
224 }
225
226 return (hUsePns);
227 }
228
229
230 /*****************************************************************************
231
232 functionname: FDKaacEnc_GetPnsParam
233 description: Gets PNS parameters depending on bitrate and bandwidth
234 returns: error status
235 input: Noiseparams struct, bitrate, sampling rate,
236 number of sfb's, pointer to sfb offset
237 output: PNS parameters
238
239 *****************************************************************************/
FDKaacEnc_GetPnsParam(NOISEPARAMS * np,INT bitRate,INT sampleRate,INT sfbCnt,const INT * sfbOffset,INT * usePns,INT numChan,const int isLC)240 AAC_ENCODER_ERROR FDKaacEnc_GetPnsParam(NOISEPARAMS *np,
241 INT bitRate,
242 INT sampleRate,
243 INT sfbCnt,
244 const INT *sfbOffset,
245 INT *usePns,
246 INT numChan,
247 const int isLC)
248
249 {
250 int i, hUsePns;
251 const PNS_INFO_TAB *pnsInfo;
252
253 if (isLC) {
254 np->detectionAlgorithmFlags = IS_LOW_COMLEXITY;
255 pnsInfo = pnsInfoTab_lowComplexity;
256 }
257 else
258 {
259 np->detectionAlgorithmFlags = 0;
260 pnsInfo = pnsInfoTab;
261 }
262
263 if (*usePns<=0)
264 return AAC_ENC_OK;
265
266 /* new pns params */
267 hUsePns = FDKaacEnc_lookUpPnsUse (bitRate, sampleRate, numChan, isLC);
268 if (hUsePns == 0) {
269 *usePns = 0;
270 return AAC_ENC_OK;
271 }
272 if (hUsePns == PNS_TABLE_ERROR)
273 return AAC_ENC_PNS_TABLE_ERROR;
274
275 /* select correct row of tuning table */
276 pnsInfo += hUsePns-1;
277
278 np->startSfb = FDKaacEnc_FreqToBandWithRounding( pnsInfo->startFreq,
279 sampleRate,
280 sfbCnt,
281 sfbOffset );
282
283 np->detectionAlgorithmFlags |= pnsInfo->detectionAlgorithmFlags;
284
285 np->refPower = FX_SGL2FX_DBL(pnsInfo->refPower);
286 np->refTonality = FX_SGL2FX_DBL(pnsInfo->refTonality);
287 np->tnsGainThreshold = pnsInfo->tnsGainThreshold;
288 np->tnsPNSGainThreshold = pnsInfo->tnsPNSGainThreshold;
289 np->minSfbWidth = pnsInfo->minSfbWidth;
290
291 np->gapFillThr = (FIXP_SGL)pnsInfo->gapFillThr;
292
293 /* assuming a constant dB/Hz slope in the signal's PSD curve,
294 the detection threshold needs to be corrected for the width of the band */
295 for ( i = 0; i < (sfbCnt-1); i++)
296 {
297 INT qtmp, sfbWidth;
298 FIXP_DBL tmp;
299
300 sfbWidth = sfbOffset[i+1]-sfbOffset[i];
301
302 tmp = fPow(np->refPower, 0, sfbWidth, DFRACT_BITS-1-5, &qtmp);
303 np->powDistPSDcurve[i] = (FIXP_SGL)((LONG)(scaleValue(tmp, qtmp) >> 16));
304 }
305 np->powDistPSDcurve[sfbCnt] = np->powDistPSDcurve[sfbCnt-1];
306
307 return AAC_ENC_OK;
308 }
309