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 /************************* Fast MPEG AAC Audio Encoder **********************
85
86 Initial author: M. Schug / A. Groeschel
87 contents/description: bandwidth expert
88
89 ******************************************************************************/
90
91 #include "channel_map.h"
92 #include "bandwidth.h"
93 #include "aacEnc_ram.h"
94
95 typedef struct{
96 INT chanBitRate;
97 INT bandWidthMono;
98 INT bandWidth2AndMoreChan;
99
100 } BANDWIDTH_TAB;
101
102 static const BANDWIDTH_TAB bandWidthTable[] = {
103 {0, 3700, 5000},
104 {12000, 5000, 6400},
105 {20000, 6900, 9640},
106 {28000, 9600, 13050},
107 {40000, 12060, 14260},
108 {56000, 13950, 15500},
109 {72000, 14200, 16120},
110 {96000, 17000, 17000},
111 {576001,17000, 17000}
112 };
113
114
115 static const BANDWIDTH_TAB bandWidthTable_LD_22050[] = {
116 { 8000, 2000, 2400},
117 {12000, 2500, 2700},
118 {16000, 3300, 3100},
119 {24000, 6250, 7200},
120 {32000, 9200, 10500},
121 {40000, 16000, 16000},
122 {48000, 16000, 16000},
123 {360001, 16000, 16000}
124 };
125
126 static const BANDWIDTH_TAB bandWidthTable_LD_24000[] = {
127 { 8000, 2000, 2000},
128 {12000, 2000, 2300},
129 {16000, 2200, 2500},
130 {24000, 5650, 6400},
131 {32000, 11600, 12000},
132 {40000, 12000, 16000},
133 {48000, 16000, 16000},
134 {64000, 16000, 16000},
135 {360001, 16000, 16000}
136 };
137
138 static const BANDWIDTH_TAB bandWidthTable_LD_32000[] = {
139 { 8000, 2000, 2000},
140 {12000, 2000, 2000},
141 {24000, 4250, 5200},
142 {32000, 8400, 9000},
143 {40000, 9400, 11300},
144 {48000, 11900, 13700},
145 {64000, 14800, 16000},
146 {76000, 16000, 16000},
147 {360001, 16000, 16000}
148 };
149
150 static const BANDWIDTH_TAB bandWidthTable_LD_44100[] = {
151 { 8000, 2000, 2000},
152 {24000, 2000, 2000},
153 {32000, 4400, 5700},
154 {40000, 7400, 8800},
155 {48000, 9000, 10700},
156 {56000, 11000, 12900},
157 {64000, 14400, 15500},
158 {80000, 16000, 16200},
159 {96000, 16500, 16000},
160 {128000, 16000, 16000},
161 {360001, 16000, 16000}
162 };
163
164 static const BANDWIDTH_TAB bandWidthTable_LD_48000[] = {
165 { 8000, 2000, 2000},
166 {24000, 2000, 2000},
167 {32000, 4400, 5700},
168 {40000, 7400, 8800},
169 {48000, 9000, 10700},
170 {56000, 11000, 12800},
171 {64000, 14300, 15400},
172 {80000, 16000, 16200},
173 {96000, 16500, 16000},
174 {128000, 16000, 16000},
175 {360001, 16000, 16000}
176 };
177
178 typedef struct{
179 AACENC_BITRATE_MODE bitrateMode;
180 int bandWidthMono;
181 int bandWidth2AndMoreChan;
182 } BANDWIDTH_TAB_VBR;
183
184 static const BANDWIDTH_TAB_VBR bandWidthTableVBR[]= {
185 {AACENC_BR_MODE_CBR, 0, 0},
186 {AACENC_BR_MODE_VBR_1, 13050, 13050},
187 {AACENC_BR_MODE_VBR_2, 13050, 13050},
188 {AACENC_BR_MODE_VBR_3, 14260, 14260},
189 {AACENC_BR_MODE_VBR_4, 15500, 15500},
190 {AACENC_BR_MODE_VBR_5, 48000, 48000},
191 {AACENC_BR_MODE_SFR, 0, 0},
192 {AACENC_BR_MODE_FF, 0, 0}
193
194 };
195
GetBandwidthEntry(const INT frameLength,const INT sampleRate,const INT chanBitRate,const INT entryNo)196 static INT GetBandwidthEntry(
197 const INT frameLength,
198 const INT sampleRate,
199 const INT chanBitRate,
200 const INT entryNo)
201 {
202 INT bandwidth = -1;
203 const BANDWIDTH_TAB *pBwTab = NULL;
204 INT bwTabSize = 0;
205
206 switch (frameLength) {
207 case 1024:
208 pBwTab = bandWidthTable;
209 bwTabSize = sizeof(bandWidthTable)/sizeof(BANDWIDTH_TAB);
210 break;
211 case 480:
212 case 512:
213 switch (sampleRate) {
214 case 8000:
215 case 11025:
216 case 12000:
217 case 16000:
218 case 22050:
219 pBwTab = bandWidthTable_LD_22050;
220 bwTabSize = sizeof(bandWidthTable_LD_22050)/sizeof(BANDWIDTH_TAB);
221 break;
222 case 24000:
223 pBwTab = bandWidthTable_LD_24000;
224 bwTabSize = sizeof(bandWidthTable_LD_24000)/sizeof(BANDWIDTH_TAB);
225 break;
226 case 32000:
227 pBwTab = bandWidthTable_LD_32000;
228 bwTabSize = sizeof(bandWidthTable_LD_32000)/sizeof(BANDWIDTH_TAB);
229 break;
230 case (44100):
231 pBwTab = bandWidthTable_LD_44100;
232 bwTabSize = sizeof(bandWidthTable_LD_44100)/sizeof(BANDWIDTH_TAB);
233 break;
234 case 48000:
235 case 64000:
236 case 88200:
237 case 96000:
238 pBwTab = bandWidthTable_LD_48000;
239 bwTabSize = sizeof(bandWidthTable_LD_48000)/sizeof(BANDWIDTH_TAB);
240 break;
241 }
242 break;
243 default:
244 pBwTab = NULL;
245 bwTabSize = 0;
246 }
247
248 if (pBwTab!=NULL) {
249 int i;
250 for (i=0; i<bwTabSize-1; i++) {
251 if (chanBitRate >= pBwTab[i].chanBitRate &&
252 chanBitRate < pBwTab[i+1].chanBitRate)
253 {
254 switch (frameLength) {
255 case 1024:
256 bandwidth = (entryNo==0)
257 ? pBwTab[i].bandWidthMono
258 : pBwTab[i].bandWidth2AndMoreChan;
259 break;
260 case 480:
261 case 512:
262 {
263 INT q_res = 0;
264 INT startBw = (entryNo==0) ? pBwTab[i ].bandWidthMono : pBwTab[i ].bandWidth2AndMoreChan;
265 INT endBw = (entryNo==0) ? pBwTab[i+1].bandWidthMono : pBwTab[i+1].bandWidth2AndMoreChan;
266 INT startBr = pBwTab[i].chanBitRate;
267 INT endBr = pBwTab[i+1].chanBitRate;
268
269 FIXP_DBL bwFac_fix = fDivNorm(chanBitRate-startBr, endBr-startBr, &q_res);
270 bandwidth = (INT)scaleValue(fMult(bwFac_fix, (FIXP_DBL)(endBw-startBw)),q_res) + startBw;
271 }
272 break;
273 default:
274 bandwidth = -1;
275 }
276 break;
277 } /* within bitrate range */
278 }
279 } /* pBwTab!=NULL */
280
281 return bandwidth;
282 }
283
284
FDKaacEnc_DetermineBandWidth(INT * bandWidth,INT proposedBandWidth,INT bitrate,AACENC_BITRATE_MODE bitrateMode,INT sampleRate,INT frameLength,CHANNEL_MAPPING * cm,CHANNEL_MODE encoderMode)285 AAC_ENCODER_ERROR FDKaacEnc_DetermineBandWidth(INT* bandWidth,
286 INT proposedBandWidth,
287 INT bitrate,
288 AACENC_BITRATE_MODE bitrateMode,
289 INT sampleRate,
290 INT frameLength,
291 CHANNEL_MAPPING* cm,
292 CHANNEL_MODE encoderMode)
293 {
294 AAC_ENCODER_ERROR ErrorStatus = AAC_ENC_OK;
295 INT chanBitRate = bitrate/cm->nChannels;
296
297 /* vbr */
298 switch(bitrateMode){
299 case AACENC_BR_MODE_VBR_1:
300 case AACENC_BR_MODE_VBR_2:
301 case AACENC_BR_MODE_VBR_3:
302 case AACENC_BR_MODE_VBR_4:
303 case AACENC_BR_MODE_VBR_5:
304 if (proposedBandWidth != 0){
305 /* use given bw */
306 *bandWidth = proposedBandWidth;
307 } else {
308 /* take bw from table */
309 switch(encoderMode){
310 case MODE_1:
311 *bandWidth = bandWidthTableVBR[bitrateMode].bandWidthMono;
312 break;
313 case MODE_2:
314 case MODE_1_2:
315 case MODE_1_2_1:
316 case MODE_1_2_2:
317 case MODE_1_2_2_1:
318 case MODE_1_2_2_2_1:
319 case MODE_7_1_REAR_SURROUND:
320 case MODE_7_1_FRONT_CENTER:
321 *bandWidth = bandWidthTableVBR[bitrateMode].bandWidth2AndMoreChan;
322 break;
323 default:
324 return AAC_ENC_UNSUPPORTED_CHANNELCONFIG;
325 }
326 }
327 break;
328 case AACENC_BR_MODE_CBR:
329 case AACENC_BR_MODE_SFR:
330 case AACENC_BR_MODE_FF:
331
332 /* bandwidth limiting */
333 if (proposedBandWidth != 0) {
334 *bandWidth = FDKmin(proposedBandWidth, FDKmin(20000, sampleRate>>1));
335 }
336 else { /* search reasonable bandwidth */
337
338 int entryNo = 0;
339
340 switch(encoderMode){
341 case MODE_1: /* mono */
342 entryNo = 0; /* use mono bandwith settings */
343 break;
344
345 case MODE_2: /* stereo */
346 case MODE_1_2: /* sce + cpe */
347 case MODE_1_2_1: /* sce + cpe + sce */
348 case MODE_1_2_2: /* sce + cpe + cpe */
349 case MODE_1_2_2_1: /* (5.1) sce + cpe + cpe + lfe */
350 case MODE_1_2_2_2_1: /* (7.1) sce + cpe + cpe + cpe + lfe */
351 case MODE_7_1_REAR_SURROUND:
352 case MODE_7_1_FRONT_CENTER:
353 entryNo = 1; /* use stereo bandwith settings */
354 break;
355
356 default:
357 return AAC_ENC_UNSUPPORTED_CHANNELCONFIG;
358 }
359
360 *bandWidth = GetBandwidthEntry(
361 frameLength,
362 sampleRate,
363 chanBitRate,
364 entryNo);
365
366 if (*bandWidth==-1) {
367 ErrorStatus = AAC_ENC_INVALID_CHANNEL_BITRATE;
368 }
369 }
370 break;
371 default:
372 *bandWidth = 0;
373 return AAC_ENC_UNSUPPORTED_BITRATE_MODE;
374 }
375
376 *bandWidth = FDKmin(*bandWidth, sampleRate/2);
377
378 return ErrorStatus;;
379 }
380