1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
|
/* -----------------------------------------------------------------------------------------------------------
Software License for The Fraunhofer FDK AAC Codec Library for Android
� Copyright 1995 - 2012 Fraunhofer-Gesellschaft zur F�rderung der angewandten Forschung e.V.
All rights reserved.
1. INTRODUCTION
The Fraunhofer FDK AAC Codec Library for Android ("FDK AAC Codec") is software that implements
the MPEG Advanced Audio Coding ("AAC") encoding and decoding scheme for digital audio.
This FDK AAC Codec software is intended to be used on a wide variety of Android devices.
AAC's HE-AAC and HE-AAC v2 versions are regarded as today's most efficient general perceptual
audio codecs. AAC-ELD is considered the best-performing full-bandwidth communications codec by
independent studies and is widely deployed. AAC has been standardized by ISO and IEC as part
of the MPEG specifications.
Patent licenses for necessary patent claims for the FDK AAC Codec (including those of Fraunhofer)
may be obtained through Via Licensing (www.vialicensing.com) or through the respective patent owners
individually for the purpose of encoding or decoding bit streams in products that are compliant with
the ISO/IEC MPEG audio standards. Please note that most manufacturers of Android devices already license
these patent claims through Via Licensing or directly from the patent owners, and therefore FDK AAC Codec
software may already be covered under those patent licenses when it is used for those licensed purposes only.
Commercially-licensed AAC software libraries, including floating-point versions with enhanced sound quality,
are also available from Fraunhofer. Users are encouraged to check the Fraunhofer website for additional
applications information and documentation.
2. COPYRIGHT LICENSE
Redistribution and use in source and binary forms, with or without modification, are permitted without
payment of copyright license fees provided that you satisfy the following conditions:
You must retain the complete text of this software license in redistributions of the FDK AAC Codec or
your modifications thereto in source code form.
You must retain the complete text of this software license in the documentation and/or other materials
provided with redistributions of the FDK AAC Codec or your modifications thereto in binary form.
You must make available free of charge copies of the complete source code of the FDK AAC Codec and your
modifications thereto to recipients of copies in binary form.
The name of Fraunhofer may not be used to endorse or promote products derived from this library without
prior written permission.
You may not charge copyright license fees for anyone to use, copy or distribute the FDK AAC Codec
software or your modifications thereto.
Your modified versions of the FDK AAC Codec must carry prominent notices stating that you changed the software
and the date of any change. For modified versions of the FDK AAC Codec, the term
"Fraunhofer FDK AAC Codec Library for Android" must be replaced by the term
"Third-Party Modified Version of the Fraunhofer FDK AAC Codec Library for Android."
3. NO PATENT LICENSE
NO EXPRESS OR IMPLIED LICENSES TO ANY PATENT CLAIMS, including without limitation the patents of Fraunhofer,
ARE GRANTED BY THIS SOFTWARE LICENSE. Fraunhofer provides no warranty of patent non-infringement with
respect to this software.
You may use this FDK AAC Codec software or modifications thereto only for purposes that are authorized
by appropriate patent licenses.
4. DISCLAIMER
This FDK AAC Codec software is provided by Fraunhofer on behalf of the copyright holders and contributors
"AS IS" and WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES, including but not limited to the implied warranties
of merchantability and fitness for a particular purpose. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
CONTRIBUTORS BE LIABLE for any direct, indirect, incidental, special, exemplary, or consequential damages,
including but not limited to procurement of substitute goods or services; loss of use, data, or profits,
or business interruption, however caused and on any theory of liability, whether in contract, strict
liability, or tort (including negligence), arising in any way out of the use of this software, even if
advised of the possibility of such damage.
5. CONTACT INFORMATION
Fraunhofer Institute for Integrated Circuits IIS
Attention: Audio and Multimedia Departments - FDK AAC LL
Am Wolfsmantel 33
91058 Erlangen, Germany
www.iis.fraunhofer.de/amm
amm-info@iis.fraunhofer.de
----------------------------------------------------------------------------------------------------------- */
/******************************** MPEG Audio Encoder **************************
Initial author: M.Lohwasser
contents/description: PNS parameters depending on bitrate and bandwidth
******************************************************************************/
#include "pnsparam.h"
#include "psy_configuration.h"
typedef struct {
SHORT startFreq;
/* Parameters for detection */
FIXP_SGL refPower;
FIXP_SGL refTonality;
SHORT tnsGainThreshold; /* scaled by TNS_PREDGAIN_SCALE (=1000) */
SHORT tnsPNSGainThreshold; /* scaled by TNS_PREDGAIN_SCALE (=1000) */
FIXP_SGL gapFillThr;
SHORT minSfbWidth;
USHORT detectionAlgorithmFlags;
} PNS_INFO_TAB;
typedef struct {
ULONG brFrom;
ULONG brTo;
UCHAR S22050;
UCHAR S24000;
UCHAR S32000;
UCHAR S44100;
UCHAR S48000;
} AUTO_PNS_TAB;
static const AUTO_PNS_TAB levelTable_mono[]= {
{0, 11999, 1, 1, 1, 1, 1,},
{12000, 19999, 1, 1, 1, 1, 1,},
{20000, 28999, 2, 1, 1, 1, 1,},
{29000, 40999, 4, 4, 4, 2, 2,},
{41000, 55999, 9, 9, 7, 7, 7,},
{56000, 79999, 0, 0, 0, 9, 9,},
{80000, 99999, 0, 0, 0, 0, 0,},
{100000,999999, 0, 0, 0, 0, 0,},
};
static const AUTO_PNS_TAB levelTable_stereo[]= {
{0, 11999, 1, 1, 1, 1, 1,},
{12000, 19999, 3, 1, 1, 1, 1,},
{20000, 28999, 3, 3, 3, 2, 2,},
{29000, 40999, 7, 6, 6, 5, 5,},
{41000, 55999, 9, 9, 7, 7, 7,},
{56000, 79999, 0, 0, 0, 0, 0,},
{80000, 99999, 0, 0, 0, 0, 0,},
{100000,999999, 0, 0, 0, 0, 0,},
};
static const PNS_INFO_TAB pnsInfoTab[] = {
/*0 pns off */
/*1*/ { 4000, FL2FXCONST_SGL(0.04), FL2FXCONST_SGL(0.06), 1150, 1200, FL2FXCONST_SGL(0.02), 8,
USE_POWER_DISTRIBUTION | USE_PSYCH_TONALITY | USE_TNS_GAIN_THR | USE_TNS_PNS /*| JUST_LONG_WINDOW*/ },
/*2*/ { 4000, FL2FXCONST_SGL(0.04), FL2FXCONST_SGL(0.07), 1130, 1300, FL2FXCONST_SGL(0.05), 8,
USE_POWER_DISTRIBUTION | USE_PSYCH_TONALITY | USE_TNS_GAIN_THR | USE_TNS_PNS /*| JUST_LONG_WINDOW*/ },
/*3*/ { 4100, FL2FXCONST_SGL(0.04), FL2FXCONST_SGL(0.07), 1100, 1400, FL2FXCONST_SGL(0.10), 8,
USE_POWER_DISTRIBUTION | USE_PSYCH_TONALITY | USE_TNS_GAIN_THR | USE_TNS_PNS /*| JUST_LONG_WINDOW*/ },
/*4*/ { 4100, FL2FXCONST_SGL(0.03), FL2FXCONST_SGL(0.10), 1100, 1400, FL2FXCONST_SGL(0.15), 8,
USE_POWER_DISTRIBUTION | USE_PSYCH_TONALITY | USE_TNS_GAIN_THR | USE_TNS_PNS /*| JUST_LONG_WINDOW*/ },
/*5*/ { 4300, FL2FXCONST_SGL(0.03), FL2FXCONST_SGL(0.10), 1100, 1400, FL2FXCONST_SGL(0.15), 8,
USE_POWER_DISTRIBUTION | USE_PSYCH_TONALITY | USE_TNS_GAIN_THR | USE_TNS_PNS | JUST_LONG_WINDOW },
/*6*/ { 5000, FL2FXCONST_SGL(0.03), FL2FXCONST_SGL(0.10), 1100, 1400, FL2FXCONST_SGL(0.25), 8,
USE_POWER_DISTRIBUTION | USE_PSYCH_TONALITY | USE_TNS_GAIN_THR | USE_TNS_PNS | JUST_LONG_WINDOW },
/*7*/ { 5500, FL2FXCONST_SGL(0.03), FL2FXCONST_SGL(0.12), 1100, 1400, FL2FXCONST_SGL(0.35), 8,
USE_POWER_DISTRIBUTION | USE_PSYCH_TONALITY | USE_TNS_GAIN_THR | USE_TNS_PNS | JUST_LONG_WINDOW },
/*8*/ { 6000, FL2FXCONST_SGL(0.03), FL2FXCONST_SGL(0.12), 1080, 1400, FL2FXCONST_SGL(0.40), 8,
USE_POWER_DISTRIBUTION | USE_PSYCH_TONALITY | USE_TNS_GAIN_THR | USE_TNS_PNS | JUST_LONG_WINDOW },
/*9*/ { 6000, FL2FXCONST_SGL(0.03), FL2FXCONST_SGL(0.14), 1070, 1400, FL2FXCONST_SGL(0.45), 8,
USE_POWER_DISTRIBUTION | USE_PSYCH_TONALITY | USE_TNS_GAIN_THR | USE_TNS_PNS | JUST_LONG_WINDOW },
};
static const AUTO_PNS_TAB levelTable_lowComplexity[]= {
{0, 27999, 0, 0, 0, 0, 0,},
{28000, 31999, 2, 2, 2, 2, 2,},
{32000, 47999, 3, 3, 3, 3, 3,},
{48000, 48000, 4, 4, 4, 4, 4,},
{48001, 999999, 0, 0, 0, 0, 0,},
};
/* conversion of old LC tuning tables to new (LD enc) structure (only entries which are actually used were converted) */
static const PNS_INFO_TAB pnsInfoTab_lowComplexity[] = {
/*0 pns off */
/* DEFAULT parameter set */
/*1*/ { 4100, FL2FXCONST_SGL(0.03), FL2FXCONST_SGL(0.16), 1100, 1400, FL2FXCONST_SGL(0.5), 16,
USE_POWER_DISTRIBUTION | USE_PSYCH_TONALITY | USE_TNS_GAIN_THR | USE_TNS_PNS | JUST_LONG_WINDOW },
/*2*/ { 4100, FL2FXCONST_SGL(0.05), FL2FXCONST_SGL(0.10), 1410, 1400, FL2FXCONST_SGL(0.5), 16,
USE_POWER_DISTRIBUTION | USE_PSYCH_TONALITY | USE_TNS_GAIN_THR | USE_TNS_PNS | JUST_LONG_WINDOW },
/*3*/ { 4100, FL2FXCONST_SGL(0.05), FL2FXCONST_SGL(0.10), 1100, 1400, FL2FXCONST_SGL(0.5), 16,
USE_POWER_DISTRIBUTION | USE_PSYCH_TONALITY | USE_TNS_GAIN_THR | USE_TNS_PNS | JUST_LONG_WINDOW },
/* LOWSUBST -> PNS is used less often than with DEFAULT parameter set (for br: 48000 - 79999) */
/*4*/ { 4100, FL2FXCONST_SGL(0.20), FL2FXCONST_SGL(0.10), 1410, 1400, FL2FXCONST_SGL(0.5), 16,
USE_POWER_DISTRIBUTION | USE_PSYCH_TONALITY | USE_TNS_GAIN_THR | USE_TNS_PNS | JUST_LONG_WINDOW },
};
/****************************************************************************
function to look up used pns level
****************************************************************************/
int FDKaacEnc_lookUpPnsUse (int bitRate, int sampleRate, int numChan, const int isLC) {
int hUsePns=0, size, i;
const AUTO_PNS_TAB *levelTable;
if (isLC) {
levelTable = &levelTable_lowComplexity[0];
size = sizeof(levelTable_lowComplexity);
} else
{ /* (E)LD */
levelTable = (numChan > 1) ? &levelTable_stereo[0] : &levelTable_mono[0];
size = (numChan > 1) ? sizeof(levelTable_stereo) : sizeof(levelTable_mono);
}
for(i = 0; i < (int) (size/sizeof(AUTO_PNS_TAB)); i++) {
if(((ULONG)bitRate >= levelTable[i].brFrom) &&
((ULONG)bitRate <= levelTable[i].brTo) )
break;
}
/* sanity check */
if ((int)(sizeof(pnsInfoTab)/sizeof(PNS_INFO_TAB)) < i ) {
return (PNS_TABLE_ERROR);
}
switch (sampleRate) {
case 22050: hUsePns = levelTable[i].S22050; break;
case 24000: hUsePns = levelTable[i].S24000; break;
case 32000: hUsePns = levelTable[i].S32000; break;
case 44100: hUsePns = levelTable[i].S44100; break;
case 48000: hUsePns = levelTable[i].S48000; break;
default:
if (isLC) {
hUsePns = levelTable[i].S48000;
}
break;
}
return (hUsePns);
}
/*****************************************************************************
functionname: FDKaacEnc_GetPnsParam
description: Gets PNS parameters depending on bitrate and bandwidth
returns: error status
input: Noiseparams struct, bitrate, sampling rate,
number of sfb's, pointer to sfb offset
output: PNS parameters
*****************************************************************************/
AAC_ENCODER_ERROR FDKaacEnc_GetPnsParam(NOISEPARAMS *np,
INT bitRate,
INT sampleRate,
INT sfbCnt,
const INT *sfbOffset,
INT *usePns,
INT numChan,
const int isLC)
{
int i, hUsePns;
const PNS_INFO_TAB *pnsInfo;
if (isLC) {
np->detectionAlgorithmFlags = IS_LOW_COMLEXITY;
pnsInfo = pnsInfoTab_lowComplexity;
}
else
{
np->detectionAlgorithmFlags = 0;
pnsInfo = pnsInfoTab;
}
if (*usePns<=0)
return AAC_ENC_OK;
/* new pns params */
hUsePns = FDKaacEnc_lookUpPnsUse (bitRate, sampleRate, numChan, isLC);
if (hUsePns == 0) {
*usePns = 0;
return AAC_ENC_OK;
}
if (hUsePns == PNS_TABLE_ERROR)
return AAC_ENC_PNS_TABLE_ERROR;
/* select correct row of tuning table */
pnsInfo += hUsePns-1;
np->startSfb = FDKaacEnc_FreqToBandWithRounding( pnsInfo->startFreq,
sampleRate,
sfbCnt,
sfbOffset );
np->detectionAlgorithmFlags |= pnsInfo->detectionAlgorithmFlags;
np->refPower = FX_SGL2FX_DBL(pnsInfo->refPower);
np->refTonality = FX_SGL2FX_DBL(pnsInfo->refTonality);
np->tnsGainThreshold = pnsInfo->tnsGainThreshold;
np->tnsPNSGainThreshold = pnsInfo->tnsPNSGainThreshold;
np->minSfbWidth = pnsInfo->minSfbWidth;
np->gapFillThr = (FIXP_SGL)pnsInfo->gapFillThr;
/* assuming a constant dB/Hz slope in the signal's PSD curve,
the detection threshold needs to be corrected for the width of the band */
for ( i = 0; i < (sfbCnt-1); i++)
{
INT qtmp, sfbWidth;
FIXP_DBL tmp;
sfbWidth = sfbOffset[i+1]-sfbOffset[i];
tmp = fPow(np->refPower, 0, sfbWidth, DFRACT_BITS-1-5, &qtmp);
np->powDistPSDcurve[i] = (FIXP_SGL)((LONG)(scaleValue(tmp, qtmp) >> 16));
}
np->powDistPSDcurve[sfbCnt] = np->powDistPSDcurve[sfbCnt-1];
return AAC_ENC_OK;
}
|
