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-4 AAC Decoder **************************
85
86 Author(s): Josef Hoepfl
87 Description:
88
89 ******************************************************************************/
90
91 #include "channel.h"
92 #include "aacdecoder.h"
93 #include "block.h"
94 #include "aacdec_tns.h"
95 #include "FDK_bitstream.h"
96 #include "FDK_tools_rom.h"
97
98 #include "conceal.h"
99
100 #include "rvlc.h"
101
102 #include "aacdec_hcr.h"
103
104
105 static
MapMidSideMaskToPnsCorrelation(CAacDecoderChannelInfo * pAacDecoderChannelInfo[2])106 void MapMidSideMaskToPnsCorrelation (CAacDecoderChannelInfo *pAacDecoderChannelInfo[2])
107 {
108 int group;
109
110 for (group = 0 ; group < pAacDecoderChannelInfo[L]->icsInfo.WindowGroups; group++) {
111 UCHAR groupMask = 1 << group;
112
113 for (UCHAR band = 0 ; band < pAacDecoderChannelInfo[L]->icsInfo.MaxSfBands; band++) {
114 if (pAacDecoderChannelInfo[L]->pComData->jointStereoData.MsUsed[band] & groupMask) { /* channels are correlated */
115 CPns_SetCorrelation(&pAacDecoderChannelInfo[L]->data.aac.PnsData, group, band, 0);
116
117 if (CPns_IsPnsUsed(&pAacDecoderChannelInfo[L]->data.aac.PnsData, group, band) &&
118 CPns_IsPnsUsed(&pAacDecoderChannelInfo[R]->data.aac.PnsData, group, band))
119 pAacDecoderChannelInfo[L]->pComData->jointStereoData.MsUsed[band] ^= groupMask; /* clear the groupMask-bit */
120 }
121 }
122 }
123 }
124
125 /*!
126 \brief Decode channel pair element
127
128 The function decodes a channel pair element.
129
130 \return none
131 */
CChannelElement_Decode(CAacDecoderChannelInfo * pAacDecoderChannelInfo[2],CAacDecoderStaticChannelInfo * pAacDecoderStaticChannelInfo[2],SamplingRateInfo * pSamplingRateInfo,UINT flags,int el_channels)132 void CChannelElement_Decode( CAacDecoderChannelInfo *pAacDecoderChannelInfo[2], /*!< pointer to aac decoder channel info */
133 CAacDecoderStaticChannelInfo *pAacDecoderStaticChannelInfo[2],
134 SamplingRateInfo *pSamplingRateInfo,
135 UINT flags,
136 int el_channels)
137 {
138 int ch, maybe_jstereo = 0;
139
140 maybe_jstereo = (el_channels > 1);
141
142 for (ch = 0; ch < el_channels; ch++) {
143 if ( pAacDecoderChannelInfo[ch]->renderMode == AACDEC_RENDER_IMDCT
144 || pAacDecoderChannelInfo[ch]->renderMode == AACDEC_RENDER_ELDFB )
145 {
146 CBlock_InverseQuantizeSpectralData(pAacDecoderChannelInfo[ch], pSamplingRateInfo);
147 }
148 }
149
150
151
152 if (maybe_jstereo) {
153 /* apply ms */
154 if (pAacDecoderChannelInfo[L]->pDynData->RawDataInfo.CommonWindow) {
155 int maxSfBandsL = GetScaleFactorBandsTransmitted(&pAacDecoderChannelInfo[L]->icsInfo);
156 int maxSfBandsR = GetScaleFactorBandsTransmitted(&pAacDecoderChannelInfo[R]->icsInfo);
157 if (pAacDecoderChannelInfo[L]->data.aac.PnsData.PnsActive || pAacDecoderChannelInfo[R]->data.aac.PnsData.PnsActive) {
158 MapMidSideMaskToPnsCorrelation(pAacDecoderChannelInfo);
159 }
160
161 CJointStereo_ApplyMS(pAacDecoderChannelInfo,
162 GetScaleFactorBandOffsets(&pAacDecoderChannelInfo[L]->icsInfo, pSamplingRateInfo),
163 GetWindowGroupLengthTable(&pAacDecoderChannelInfo[L]->icsInfo),
164 GetWindowGroups(&pAacDecoderChannelInfo[L]->icsInfo),
165 maxSfBandsL,
166 maxSfBandsR);
167 }
168
169 /* apply intensity stereo */ /* modifies pAacDecoderChannelInfo[]->aSpecSfb */
170 CJointStereo_ApplyIS(pAacDecoderChannelInfo,
171 GetScaleFactorBandOffsets(&pAacDecoderChannelInfo[L]->icsInfo, pSamplingRateInfo),
172 GetWindowGroupLengthTable(&pAacDecoderChannelInfo[L]->icsInfo),
173 GetWindowGroups(&pAacDecoderChannelInfo[L]->icsInfo),
174 GetScaleFactorBandsTransmitted(&pAacDecoderChannelInfo[L]->icsInfo),
175 pAacDecoderChannelInfo[L]->pDynData->RawDataInfo.CommonWindow ? 1 : 0);
176
177 }
178
179 for (ch = 0; ch < el_channels; ch++)
180 {
181 {
182 /* write pAacDecoderChannelInfo[ch]->specScale */
183 CBlock_ScaleSpectralData(pAacDecoderChannelInfo[ch], pSamplingRateInfo);
184
185 ApplyTools (pAacDecoderChannelInfo, pSamplingRateInfo, flags, ch);
186 }
187
188 }
189
190 CRvlc_ElementCheck(
191 pAacDecoderChannelInfo,
192 pAacDecoderStaticChannelInfo,
193 flags,
194 el_channels
195 );
196 }
197
CChannel_CodebookTableInit(CAacDecoderChannelInfo * pAacDecoderChannelInfo)198 void CChannel_CodebookTableInit(CAacDecoderChannelInfo *pAacDecoderChannelInfo)
199 {
200 int b, w, maxBands, maxWindows;
201 int maxSfb = GetScaleFactorBandsTransmitted(&pAacDecoderChannelInfo->icsInfo);
202 UCHAR *pCodeBook = pAacDecoderChannelInfo->pDynData->aCodeBook;
203
204 if ( IsLongBlock(&pAacDecoderChannelInfo->icsInfo) ) {
205 maxBands = 64;
206 maxWindows = 1;
207 } else {
208 maxBands = 16;
209 maxWindows = 8;
210 }
211
212 for (w = 0; w<maxWindows; w++) {
213 for (b = 0; b < maxSfb; b++) {
214 pCodeBook[b] = ESCBOOK;
215 }
216 for (; b<maxBands; b++) {
217 pCodeBook[b] = ZERO_HCB;
218 }
219 pCodeBook += maxBands;
220 }
221 }
222
223
224 /*
225 * Arbitrary order bitstream parser
226 */
227
CChannelElement_Read(HANDLE_FDK_BITSTREAM hBs,CAacDecoderChannelInfo * pAacDecoderChannelInfo[],CAacDecoderStaticChannelInfo * pAacDecoderStaticChannelInfo[],const AUDIO_OBJECT_TYPE aot,const SamplingRateInfo * pSamplingRateInfo,const UINT flags,const UINT frame_length,const UCHAR numberOfChannels,const SCHAR epConfig,HANDLE_TRANSPORTDEC pTpDec)228 AAC_DECODER_ERROR CChannelElement_Read(HANDLE_FDK_BITSTREAM hBs,
229 CAacDecoderChannelInfo *pAacDecoderChannelInfo[],
230 CAacDecoderStaticChannelInfo *pAacDecoderStaticChannelInfo[],
231 const AUDIO_OBJECT_TYPE aot,
232 const SamplingRateInfo *pSamplingRateInfo,
233 const UINT flags,
234 const UINT frame_length,
235 const UCHAR numberOfChannels,
236 const SCHAR epConfig,
237 HANDLE_TRANSPORTDEC pTpDec
238 )
239 {
240 AAC_DECODER_ERROR error = AAC_DEC_OK;
241 const element_list_t *list;
242 int i, ch, decision_bit;
243 int crcReg1 = -1, crcReg2 = -1;
244
245 FDK_ASSERT( (numberOfChannels == 1) || (numberOfChannels == 2) );
246
247 /* Get channel element sequence table */
248 list = getBitstreamElementList(aot, epConfig, numberOfChannels, 0);
249 if (list == NULL) {
250 error = AAC_DEC_UNSUPPORTED_FORMAT;
251 goto bail;
252 }
253
254 CTns_Reset(&pAacDecoderChannelInfo[0]->pDynData->TnsData);
255 if (numberOfChannels == 2) {
256 CTns_Reset(&pAacDecoderChannelInfo[1]->pDynData->TnsData);
257 }
258
259 if (flags & (AC_ELD|AC_SCALABLE)) {
260 pAacDecoderChannelInfo[0]->pDynData->RawDataInfo.CommonWindow = 1;
261 if (numberOfChannels == 2) {
262 pAacDecoderChannelInfo[1]->pDynData->RawDataInfo.CommonWindow = pAacDecoderChannelInfo[0]->pDynData->RawDataInfo.CommonWindow;
263 }
264 if (numberOfChannels == 2) {
265 pAacDecoderChannelInfo[1]->pDynData->RawDataInfo.CommonWindow = pAacDecoderChannelInfo[0]->pDynData->RawDataInfo.CommonWindow;
266 }
267 }
268
269 /* Iterate through sequence table */
270 i = 0;
271 ch = 0;
272 decision_bit = 0;
273 do {
274 switch (list->id[i]) {
275 case element_instance_tag:
276 pAacDecoderChannelInfo[0]->ElementInstanceTag = FDKreadBits(hBs, 4);
277 if (numberOfChannels == 2) {
278 pAacDecoderChannelInfo[1]->ElementInstanceTag = pAacDecoderChannelInfo[0]->ElementInstanceTag;
279 }
280 break;
281 case common_window:
282 decision_bit = pAacDecoderChannelInfo[ch]->pDynData->RawDataInfo.CommonWindow = FDKreadBits(hBs, 1);
283 if (numberOfChannels == 2) {
284 pAacDecoderChannelInfo[1]->pDynData->RawDataInfo.CommonWindow = pAacDecoderChannelInfo[0]->pDynData->RawDataInfo.CommonWindow;
285 }
286 break;
287 case ics_info:
288 /* Read individual channel info */
289 error = IcsRead( hBs,
290 &pAacDecoderChannelInfo[ch]->icsInfo,
291 pSamplingRateInfo,
292 flags );
293
294 if (numberOfChannels == 2 && pAacDecoderChannelInfo[0]->pDynData->RawDataInfo.CommonWindow) {
295 pAacDecoderChannelInfo[1]->icsInfo = pAacDecoderChannelInfo[0]->icsInfo;
296 }
297 break;
298
299
300 case ltp_data_present:
301 if (FDKreadBits(hBs, 1) != 0) {
302 error = AAC_DEC_UNSUPPORTED_PREDICTION;
303 }
304 break;
305
306 case ms:
307 if ( CJointStereo_Read(
308 hBs,
309 &pAacDecoderChannelInfo[0]->pComData->jointStereoData,
310 GetWindowGroups(&pAacDecoderChannelInfo[0]->icsInfo),
311 GetScaleMaxFactorBandsTransmitted(&pAacDecoderChannelInfo[0]->icsInfo,
312 &pAacDecoderChannelInfo[1]->icsInfo),
313 flags) )
314 {
315 error = AAC_DEC_PARSE_ERROR;
316 }
317 break;
318
319 case global_gain:
320 pAacDecoderChannelInfo[ch]->pDynData->RawDataInfo.GlobalGain = (UCHAR) FDKreadBits(hBs,8);
321 break;
322
323 case section_data:
324 error = CBlock_ReadSectionData( hBs,
325 pAacDecoderChannelInfo[ch],
326 pSamplingRateInfo,
327 flags );
328 break;
329
330
331 case scale_factor_data:
332 if (flags & AC_ER_RVLC) {
333 /* read RVLC data from bitstream (error sens. cat. 1) */
334 CRvlc_Read(pAacDecoderChannelInfo[ch], hBs);
335 }
336 else
337 {
338 error = CBlock_ReadScaleFactorData(pAacDecoderChannelInfo[ch], hBs, flags);
339 }
340 break;
341
342 case pulse:
343 if ( CPulseData_Read( hBs,
344 &pAacDecoderChannelInfo[ch]->pDynData->specificTo.aac.PulseData,
345 pSamplingRateInfo->ScaleFactorBands_Long, /* pulse data is only allowed to be present in long blocks! */
346 (void*)&pAacDecoderChannelInfo[ch]->icsInfo,
347 frame_length
348 ) != 0 )
349 {
350 error = AAC_DEC_DECODE_FRAME_ERROR;
351 }
352 break;
353 case tns_data_present:
354 CTns_ReadDataPresentFlag(hBs, &pAacDecoderChannelInfo[ch]->pDynData->TnsData);
355 break;
356 case tns_data:
357 /* tns_data_present is checked inside CTns_Read(). */
358 error = CTns_Read(hBs, &pAacDecoderChannelInfo[ch]->pDynData->TnsData, &pAacDecoderChannelInfo[ch]->icsInfo, flags);
359 break;
360
361 case gain_control_data:
362 break;
363
364 case gain_control_data_present:
365 if (FDKreadBits(hBs, 1)) {
366 error = AAC_DEC_UNSUPPORTED_GAIN_CONTROL_DATA;
367 }
368 break;
369
370 case esc2_rvlc:
371 if (flags & AC_ER_RVLC) {
372 CRvlc_Decode(
373 pAacDecoderChannelInfo[ch],
374 pAacDecoderStaticChannelInfo[ch],
375 hBs
376 );
377 }
378 break;
379
380 case esc1_hcr:
381 if (flags & AC_ER_HCR) {
382 CHcr_Read(hBs, pAacDecoderChannelInfo[ch] );
383 }
384 break;
385
386 case spectral_data:
387 error = CBlock_ReadSpectralData( hBs,
388 pAacDecoderChannelInfo[ch],
389 pSamplingRateInfo,
390 flags );
391 if (flags & AC_ELD) {
392 pAacDecoderChannelInfo[ch]->renderMode = AACDEC_RENDER_ELDFB;
393 } else {
394 pAacDecoderChannelInfo[ch]->renderMode = AACDEC_RENDER_IMDCT;
395 }
396 break;
397
398
399 /* CRC handling */
400 case adtscrc_start_reg1:
401 if (pTpDec != NULL) {
402 crcReg1 = transportDec_CrcStartReg(pTpDec, 192);
403 }
404 break;
405 case adtscrc_start_reg2:
406 if (pTpDec != NULL) {
407 crcReg2 = transportDec_CrcStartReg(pTpDec, 128);
408 }
409 break;
410 case adtscrc_end_reg1:
411 case drmcrc_end_reg:
412 if (pTpDec != NULL) {
413 transportDec_CrcEndReg(pTpDec, crcReg1);
414 }
415 break;
416 case adtscrc_end_reg2:
417 if (pTpDec != NULL) {
418 transportDec_CrcEndReg(pTpDec, crcReg2);
419 }
420 break;
421 case drmcrc_start_reg:
422 if (pTpDec != NULL) {
423 crcReg1 = transportDec_CrcStartReg(pTpDec, 0);
424 }
425 break;
426
427 /* Non data cases */
428 case next_channel:
429 ch = (ch + 1) % numberOfChannels;
430 break;
431 case link_sequence:
432 list = list->next[decision_bit];
433 i=-1;
434 break;
435
436 default:
437 error = AAC_DEC_UNSUPPORTED_FORMAT;
438 break;
439 }
440
441 if (error != AAC_DEC_OK) {
442 goto bail;
443 }
444
445 i++;
446
447 } while (list->id[i] != end_of_sequence);
448
449 bail:
450 return error;
451 }
452