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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 transport format decoder library *********************
96 
97    Author(s):   Daniel Homm
98 
99    Description:
100 
101 *******************************************************************************/
102 
103 #include "tpdec_latm.h"
104 
105 #include "FDK_bitstream.h"
106 
107 #define TPDEC_TRACKINDEX(p, l) (1 * (p) + (l))
108 
CLatmDemux_GetValue(HANDLE_FDK_BITSTREAM bs)109 static UINT CLatmDemux_GetValue(HANDLE_FDK_BITSTREAM bs) {
110   UCHAR bytesForValue = 0, tmp = 0;
111   int value = 0;
112 
113   bytesForValue = (UCHAR)FDKreadBits(bs, 2);
114 
115   for (UINT i = 0; i <= bytesForValue; i++) {
116     value <<= 8;
117     tmp = (UCHAR)FDKreadBits(bs, 8);
118     value += tmp;
119   }
120 
121   return value;
122 }
123 
CLatmDemux_ReadAudioMuxElement(HANDLE_FDK_BITSTREAM bs,CLatmDemux * pLatmDemux,int m_muxConfigPresent,CSTpCallBacks * pTpDecCallbacks,CSAudioSpecificConfig * pAsc,int * pfConfigFound)124 static TRANSPORTDEC_ERROR CLatmDemux_ReadAudioMuxElement(
125     HANDLE_FDK_BITSTREAM bs, CLatmDemux *pLatmDemux, int m_muxConfigPresent,
126     CSTpCallBacks *pTpDecCallbacks, CSAudioSpecificConfig *pAsc,
127     int *pfConfigFound) {
128   TRANSPORTDEC_ERROR ErrorStatus = TRANSPORTDEC_OK;
129 
130   if (m_muxConfigPresent) {
131     pLatmDemux->m_useSameStreamMux = FDKreadBits(bs, 1);
132 
133     if (!pLatmDemux->m_useSameStreamMux) {
134       int i;
135       UCHAR configChanged = 0;
136       UCHAR configMode = 0;
137 
138       FDK_BITSTREAM bsAnchor;
139 
140       FDK_BITSTREAM bsAnchorDummyParse;
141 
142       if (!pLatmDemux->applyAsc) {
143         bsAnchorDummyParse = *bs;
144         pLatmDemux->newCfgHasAudioPreRoll = 0;
145         /* do dummy-parsing of ASC to determine if there is an audioPreRoll */
146         configMode |= AC_CM_DET_CFG_CHANGE;
147         if (TRANSPORTDEC_OK !=
148             (ErrorStatus = CLatmDemux_ReadStreamMuxConfig(
149                  bs, pLatmDemux, pTpDecCallbacks, pAsc, pfConfigFound,
150                  configMode, configChanged))) {
151           goto bail;
152         }
153 
154         /* Allow flushing only when audioPreroll functionality is enabled in
155          * current and new config otherwise the new config can be applied
156          * immediately. */
157         if (pAsc->m_sc.m_usacConfig.element[0]
158                 .extElement.usacExtElementHasAudioPreRoll &&
159             pLatmDemux->newCfgHasAudioPreRoll) {
160           pLatmDemux->newCfgHasAudioPreRoll = 0;
161           /* with audioPreRoll we must flush before applying new cfg */
162           pLatmDemux->applyAsc = 0;
163         } else {
164           *bs = bsAnchorDummyParse;
165           pLatmDemux->applyAsc = 1; /* apply new config immediate */
166         }
167       }
168 
169       if (pLatmDemux->applyAsc) {
170         for (i = 0; i < 2; i++) {
171           configMode = 0;
172 
173           if (i == 0) {
174             configMode |= AC_CM_DET_CFG_CHANGE;
175             bsAnchor = *bs;
176           } else {
177             configMode |= AC_CM_ALLOC_MEM;
178             *bs = bsAnchor;
179           }
180 
181           if (TRANSPORTDEC_OK !=
182               (ErrorStatus = CLatmDemux_ReadStreamMuxConfig(
183                    bs, pLatmDemux, pTpDecCallbacks, pAsc, pfConfigFound,
184                    configMode, configChanged))) {
185             goto bail;
186           }
187 
188           if (ErrorStatus == TRANSPORTDEC_OK) {
189             if ((i == 0) && (pAsc->AacConfigChanged || pAsc->SbrConfigChanged ||
190                              pAsc->SacConfigChanged)) {
191               int errC;
192 
193               configChanged = 1;
194               errC = pTpDecCallbacks->cbFreeMem(pTpDecCallbacks->cbFreeMemData,
195                                                 pAsc);
196               if (errC != 0) {
197                 ErrorStatus = TRANSPORTDEC_PARSE_ERROR;
198                 goto bail;
199               }
200             }
201           }
202         }
203       }
204     }
205   }
206 
207   /* If there was no configuration read, its not possible to parse
208    * PayloadLengthInfo below. */
209   if (!*pfConfigFound) {
210     ErrorStatus = TRANSPORTDEC_SYNC_ERROR;
211     goto bail;
212   }
213 
214   if (pLatmDemux->m_AudioMuxVersionA == 0) {
215     /* Do only once per call, because parsing and decoding is done in-line. */
216     if (TRANSPORTDEC_OK !=
217         (ErrorStatus = CLatmDemux_ReadPayloadLengthInfo(bs, pLatmDemux))) {
218       *pfConfigFound = 0;
219       goto bail;
220     }
221   } else {
222     /* audioMuxVersionA > 0 is reserved for future extensions */
223     ErrorStatus = TRANSPORTDEC_UNSUPPORTED_FORMAT;
224     *pfConfigFound = 0;
225     goto bail;
226   }
227 
228 bail:
229   if (ErrorStatus != TRANSPORTDEC_OK) {
230     pLatmDemux->applyAsc = 1;
231   }
232 
233   return (ErrorStatus);
234 }
235 
CLatmDemux_Read(HANDLE_FDK_BITSTREAM bs,CLatmDemux * pLatmDemux,TRANSPORT_TYPE tt,CSTpCallBacks * pTpDecCallbacks,CSAudioSpecificConfig * pAsc,int * pfConfigFound,const INT ignoreBufferFullness)236 TRANSPORTDEC_ERROR CLatmDemux_Read(HANDLE_FDK_BITSTREAM bs,
237                                    CLatmDemux *pLatmDemux, TRANSPORT_TYPE tt,
238                                    CSTpCallBacks *pTpDecCallbacks,
239                                    CSAudioSpecificConfig *pAsc,
240                                    int *pfConfigFound,
241                                    const INT ignoreBufferFullness) {
242   UINT cntBits;
243   UINT cmpBufferFullness;
244   UINT audioMuxLengthBytesLast = 0;
245   TRANSPORTDEC_ERROR ErrorStatus = TRANSPORTDEC_OK;
246 
247   cntBits = FDKgetValidBits(bs);
248 
249   if ((INT)cntBits < MIN_LATM_HEADERLENGTH) {
250     return TRANSPORTDEC_NOT_ENOUGH_BITS;
251   }
252 
253   if (TRANSPORTDEC_OK != (ErrorStatus = CLatmDemux_ReadAudioMuxElement(
254                               bs, pLatmDemux, (tt != TT_MP4_LATM_MCP0),
255                               pTpDecCallbacks, pAsc, pfConfigFound)))
256     return (ErrorStatus);
257 
258   if (!ignoreBufferFullness) {
259     cmpBufferFullness =
260         24 + audioMuxLengthBytesLast * 8 +
261         pLatmDemux->m_linfo[0][0].m_bufferFullness *
262             pAsc[TPDEC_TRACKINDEX(0, 0)].m_channelConfiguration * 32;
263 
264     /* evaluate buffer fullness */
265 
266     if (pLatmDemux->m_linfo[0][0].m_bufferFullness != 0xFF) {
267       if (!pLatmDemux->BufferFullnessAchieved) {
268         if (cntBits < cmpBufferFullness) {
269           /* condition for start of decoding is not fulfilled */
270 
271           /* the current frame will not be decoded */
272           return TRANSPORTDEC_NOT_ENOUGH_BITS;
273         } else {
274           pLatmDemux->BufferFullnessAchieved = 1;
275         }
276       }
277     }
278   }
279 
280   return (ErrorStatus);
281 }
282 
CLatmDemux_ReadStreamMuxConfig(HANDLE_FDK_BITSTREAM bs,CLatmDemux * pLatmDemux,CSTpCallBacks * pTpDecCallbacks,CSAudioSpecificConfig * pAsc,int * pfConfigFound,UCHAR configMode,UCHAR configChanged)283 TRANSPORTDEC_ERROR CLatmDemux_ReadStreamMuxConfig(
284     HANDLE_FDK_BITSTREAM bs, CLatmDemux *pLatmDemux,
285     CSTpCallBacks *pTpDecCallbacks, CSAudioSpecificConfig *pAsc,
286     int *pfConfigFound, UCHAR configMode, UCHAR configChanged) {
287   CSAudioSpecificConfig ascDummy; /* the actual config is needed for flushing,
288                                      after that new config can be parsed */
289   CSAudioSpecificConfig *pAscDummy;
290   pAscDummy = &ascDummy;
291   pLatmDemux->usacExplicitCfgChanged = 0;
292   LATM_LAYER_INFO *p_linfo = NULL;
293   TRANSPORTDEC_ERROR ErrorStatus = TRANSPORTDEC_OK;
294   UCHAR updateConfig[1 * 1] = {0};
295 
296   pLatmDemux->m_AudioMuxVersion = FDKreadBits(bs, 1);
297 
298   if (pLatmDemux->m_AudioMuxVersion == 0) {
299     pLatmDemux->m_AudioMuxVersionA = 0;
300   } else {
301     pLatmDemux->m_AudioMuxVersionA = FDKreadBits(bs, 1);
302   }
303 
304   if (pLatmDemux->m_AudioMuxVersionA == 0) {
305     if (pLatmDemux->m_AudioMuxVersion == 1) {
306       pLatmDemux->m_taraBufferFullness = CLatmDemux_GetValue(bs);
307     }
308     pLatmDemux->m_allStreamsSameTimeFraming = FDKreadBits(bs, 1);
309     pLatmDemux->m_noSubFrames = FDKreadBits(bs, 6) + 1;
310     pLatmDemux->m_numProgram = FDKreadBits(bs, 4) + 1;
311 
312     if (pLatmDemux->m_numProgram > LATM_MAX_PROG) {
313       ErrorStatus = TRANSPORTDEC_UNSUPPORTED_FORMAT;
314       goto bail;
315     }
316 
317     int idCnt = 0;
318     for (UINT prog = 0; prog < pLatmDemux->m_numProgram; prog++) {
319       pLatmDemux->m_numLayer[prog] = FDKreadBits(bs, 3) + 1;
320       if (pLatmDemux->m_numLayer[prog] > LATM_MAX_LAYER) {
321         ErrorStatus = TRANSPORTDEC_UNSUPPORTED_FORMAT;
322         goto bail;
323       }
324 
325       for (UINT lay = 0; lay < pLatmDemux->m_numLayer[prog]; lay++) {
326         int useSameConfig;
327         p_linfo = &pLatmDemux->m_linfo[prog][lay];
328 
329         p_linfo->m_streamID = idCnt++;
330         p_linfo->m_frameLengthInBits = 0;
331 
332         if ((prog == 0) && (lay == 0)) {
333           useSameConfig = 0;
334         } else {
335           useSameConfig = FDKreadBits(bs, 1);
336         }
337 
338         if (useSameConfig) {
339           if (lay > 0) {
340             FDKmemcpy(&pAsc[TPDEC_TRACKINDEX(prog, lay)],
341                       &pAsc[TPDEC_TRACKINDEX(prog, lay - 1)],
342                       sizeof(CSAudioSpecificConfig));
343           } else {
344             ErrorStatus = TRANSPORTDEC_PARSE_ERROR;
345             goto bail;
346           }
347         } else {
348           UINT usacConfigLengthPrev = 0;
349           UCHAR usacConfigPrev[TP_USAC_MAX_CONFIG_LEN];
350 
351           if (!(pLatmDemux->applyAsc) &&
352               (pAsc[TPDEC_TRACKINDEX(prog, lay)].m_aot == AOT_USAC)) {
353             usacConfigLengthPrev =
354                 (UINT)(pAsc[TPDEC_TRACKINDEX(prog, lay)]
355                            .m_sc.m_usacConfig.UsacConfigBits +
356                        7) >>
357                 3; /* store previous USAC config length */
358             if (usacConfigLengthPrev > TP_USAC_MAX_CONFIG_LEN) {
359               ErrorStatus = TRANSPORTDEC_PARSE_ERROR;
360               goto bail;
361             }
362             FDKmemclear(usacConfigPrev, TP_USAC_MAX_CONFIG_LEN);
363             FDKmemcpy(
364                 usacConfigPrev,
365                 &pAsc[TPDEC_TRACKINDEX(prog, lay)].m_sc.m_usacConfig.UsacConfig,
366                 usacConfigLengthPrev); /* store previous USAC config */
367           }
368           if (pLatmDemux->m_AudioMuxVersion == 1) {
369             FDK_BITSTREAM tmpBs;
370             UINT ascLen = 0;
371             ascLen = CLatmDemux_GetValue(bs);
372             /* The ascLen could be wrong, so check if validBits<=bufBits*/
373             if (ascLen > FDKgetValidBits(bs)) {
374               ErrorStatus = TRANSPORTDEC_PARSE_ERROR;
375               goto bail;
376             }
377             FDKsyncCache(bs);
378             tmpBs = *bs;
379             tmpBs.hBitBuf.ValidBits = ascLen;
380 
381             /* Read ASC */
382             if (pLatmDemux->applyAsc) {
383               if (TRANSPORTDEC_OK !=
384                   (ErrorStatus = AudioSpecificConfig_Parse(
385                        &pAsc[TPDEC_TRACKINDEX(prog, lay)], &tmpBs, 1,
386                        pTpDecCallbacks, configMode, configChanged,
387                        AOT_NULL_OBJECT)))
388                 goto bail;
389             } else {
390               if (TRANSPORTDEC_OK !=
391                   (ErrorStatus = AudioSpecificConfig_Parse(
392                        pAscDummy, &tmpBs, 1, pTpDecCallbacks, configMode,
393                        configChanged, AOT_NULL_OBJECT)))
394                 goto bail;
395             }
396 
397             /* The field p_linfo->m_ascLen could be wrong, so check if */
398             if (0 > (INT)FDKgetValidBits(&tmpBs)) {
399               ErrorStatus = TRANSPORTDEC_PARSE_ERROR;
400               goto bail;
401             }
402             FDKpushFor(bs, ascLen); /* position bitstream after ASC */
403           } else {
404             /* Read ASC */
405             if (pLatmDemux->applyAsc) {
406               if (TRANSPORTDEC_OK != (ErrorStatus = AudioSpecificConfig_Parse(
407                                           &pAsc[TPDEC_TRACKINDEX(prog, lay)],
408                                           bs, 0, pTpDecCallbacks, configMode,
409                                           configChanged, AOT_NULL_OBJECT)))
410                 goto bail;
411             } else {
412               if (TRANSPORTDEC_OK !=
413                   (ErrorStatus = AudioSpecificConfig_Parse(
414                        pAscDummy, bs, 0, pTpDecCallbacks, configMode,
415                        configChanged, AOT_NULL_OBJECT)))
416                 goto bail;
417             }
418           }
419           if (!pLatmDemux->applyAsc) {
420             updateConfig[TPDEC_TRACKINDEX(prog, lay)] = 0;
421           } else {
422             updateConfig[TPDEC_TRACKINDEX(prog, lay)] = 1;
423           }
424 
425           if (!pLatmDemux->applyAsc) {
426             if (pAscDummy[TPDEC_TRACKINDEX(prog, lay)].m_aot ==
427                 AOT_USAC) { /* flush in case SMC has changed */
428               const UINT usacConfigLength =
429                   (UINT)(pAscDummy->m_sc.m_usacConfig.UsacConfigBits + 7) >> 3;
430               if (usacConfigLength > TP_USAC_MAX_CONFIG_LEN) {
431                 ErrorStatus = TRANSPORTDEC_PARSE_ERROR;
432                 goto bail;
433               }
434               if (usacConfigLength != usacConfigLengthPrev) {
435                 FDKmemclear(&pAsc[TPDEC_TRACKINDEX(prog, lay)]
436                                  .m_sc.m_usacConfig.UsacConfig,
437                             TP_USAC_MAX_CONFIG_LEN);
438                 FDKmemcpy(&pAsc[TPDEC_TRACKINDEX(prog, lay)]
439                                .m_sc.m_usacConfig.UsacConfig,
440                           &pAscDummy->m_sc.m_usacConfig.UsacConfig,
441                           usacConfigLength); /* store new USAC config */
442                 pAsc[TPDEC_TRACKINDEX(prog, lay)]
443                     .m_sc.m_usacConfig.UsacConfigBits =
444                     pAscDummy->m_sc.m_usacConfig.UsacConfigBits;
445                 pLatmDemux->usacExplicitCfgChanged = 1;
446               } else {
447                 if (FDKmemcmp(usacConfigPrev,
448                               pAscDummy->m_sc.m_usacConfig.UsacConfig,
449                               usacConfigLengthPrev)) {
450                   FDKmemclear(&pAsc[TPDEC_TRACKINDEX(prog, lay)]
451                                    .m_sc.m_usacConfig.UsacConfig,
452                               TP_USAC_MAX_CONFIG_LEN);
453                   FDKmemcpy(&pAsc[TPDEC_TRACKINDEX(prog, lay)]
454                                  .m_sc.m_usacConfig.UsacConfig,
455                             &pAscDummy->m_sc.m_usacConfig.UsacConfig,
456                             usacConfigLength); /* store new USAC config */
457                   pAsc[TPDEC_TRACKINDEX(prog, lay)]
458                       .m_sc.m_usacConfig.UsacConfigBits =
459                       pAscDummy->m_sc.m_usacConfig.UsacConfigBits;
460                   pLatmDemux->usacExplicitCfgChanged = 1;
461                 }
462               }
463 
464               if (pAscDummy[TPDEC_TRACKINDEX(prog, lay)]
465                       .m_sc.m_usacConfig.m_usacNumElements) {
466                 if (pAscDummy[TPDEC_TRACKINDEX(prog, lay)]
467                         .m_sc.m_usacConfig.element[0]
468                         .extElement.usacExtElementHasAudioPreRoll) {
469                   pLatmDemux->newCfgHasAudioPreRoll =
470                       1; /* if dummy parsed cfg has audioPreRoll we first flush
471                             before applying new cfg */
472                 }
473               }
474             }
475           }
476         }
477 
478         p_linfo->m_frameLengthType = FDKreadBits(bs, 3);
479         switch (p_linfo->m_frameLengthType) {
480           case 0:
481             p_linfo->m_bufferFullness = FDKreadBits(bs, 8);
482 
483             if (!pLatmDemux->m_allStreamsSameTimeFraming) {
484               if ((lay > 0) &&
485                   (pAsc[TPDEC_TRACKINDEX(prog, lay)].m_aot == AOT_AAC_SCAL ||
486                    pAsc[TPDEC_TRACKINDEX(prog, lay)].m_aot ==
487                        AOT_ER_AAC_SCAL) &&
488                   (pAsc[TPDEC_TRACKINDEX(prog, lay - 1)].m_aot == AOT_CELP ||
489                    pAsc[TPDEC_TRACKINDEX(prog, lay - 1)].m_aot ==
490                        AOT_ER_CELP)) { /* The layer maybe
491                                           ignored later so
492                                           read it anyway: */
493                 /* coreFrameOffset = */ FDKreadBits(bs, 6);
494               }
495             }
496             break;
497           case 1:
498             p_linfo->m_frameLengthInBits = FDKreadBits(bs, 9);
499             break;
500           case 3:
501           case 4:
502           case 5:
503             /* CELP */
504           case 6:
505           case 7:
506             /* HVXC */
507           default:
508             ErrorStatus = TRANSPORTDEC_PARSE_ERROR;
509             goto bail;
510         } /* switch framelengthtype*/
511 
512       } /* layer loop */
513     }   /* prog loop */
514 
515     pLatmDemux->m_otherDataPresent = FDKreadBits(bs, 1);
516     pLatmDemux->m_otherDataLength = 0;
517 
518     if (pLatmDemux->m_otherDataPresent) {
519       if (pLatmDemux->m_AudioMuxVersion == 1) {
520         pLatmDemux->m_otherDataLength = CLatmDemux_GetValue(bs);
521       } else {
522         int otherDataLenEsc = 0;
523         do {
524           pLatmDemux->m_otherDataLength <<= 8;  // *= 256
525           otherDataLenEsc = FDKreadBits(bs, 1);
526           pLatmDemux->m_otherDataLength += FDKreadBits(bs, 8);
527         } while (otherDataLenEsc);
528       }
529       if (pLatmDemux->m_audioMuxLengthBytes <
530           (pLatmDemux->m_otherDataLength >> 3)) {
531         ErrorStatus = TRANSPORTDEC_PARSE_ERROR;
532         goto bail;
533       }
534     }
535 
536     pLatmDemux->m_crcCheckPresent = FDKreadBits(bs, 1);
537 
538     if (pLatmDemux->m_crcCheckPresent) {
539       FDKreadBits(bs, 8);
540     }
541 
542   } else {
543     /* audioMuxVersionA > 0 is reserved for future extensions */
544     ErrorStatus = TRANSPORTDEC_UNSUPPORTED_FORMAT;
545   }
546 
547   /* Configure source decoder: */
548   if (ErrorStatus == TRANSPORTDEC_OK) {
549     UINT prog;
550     for (prog = 0; prog < pLatmDemux->m_numProgram; prog++) {
551       UINT lay;
552       for (lay = 0; lay < pLatmDemux->m_numLayer[prog]; lay++) {
553         if (updateConfig[TPDEC_TRACKINDEX(prog, lay)] != 0) {
554           int cbError;
555           cbError = pTpDecCallbacks->cbUpdateConfig(
556               pTpDecCallbacks->cbUpdateConfigData,
557               &pAsc[TPDEC_TRACKINDEX(prog, lay)],
558               pAsc[TPDEC_TRACKINDEX(prog, lay)].configMode,
559               &pAsc[TPDEC_TRACKINDEX(prog, lay)].AacConfigChanged);
560           if (cbError == TRANSPORTDEC_NEED_TO_RESTART) {
561             *pfConfigFound = 0;
562             ErrorStatus = TRANSPORTDEC_NEED_TO_RESTART;
563             goto bail;
564           }
565           if (cbError != 0) {
566             *pfConfigFound = 0;
567             if (lay == 0) {
568               ErrorStatus = TRANSPORTDEC_SYNC_ERROR;
569               goto bail;
570             }
571           } else {
572             *pfConfigFound = 1;
573           }
574         } else {
575           *pfConfigFound = 1;
576         }
577       }
578     }
579   }
580 
581 bail:
582   if (ErrorStatus != TRANSPORTDEC_OK) {
583     UCHAR applyAsc = pLatmDemux->applyAsc;
584     FDKmemclear(pLatmDemux, sizeof(CLatmDemux)); /* reset structure */
585     pLatmDemux->applyAsc = applyAsc;
586   } else {
587     /* no error and config parsing is finished */
588     if (configMode == AC_CM_ALLOC_MEM) pLatmDemux->applyAsc = 0;
589   }
590 
591   return (ErrorStatus);
592 }
593 
CLatmDemux_ReadPayloadLengthInfo(HANDLE_FDK_BITSTREAM bs,CLatmDemux * pLatmDemux)594 TRANSPORTDEC_ERROR CLatmDemux_ReadPayloadLengthInfo(HANDLE_FDK_BITSTREAM bs,
595                                                     CLatmDemux *pLatmDemux) {
596   TRANSPORTDEC_ERROR ErrorStatus = TRANSPORTDEC_OK;
597   int totalPayloadBits = 0;
598 
599   if (pLatmDemux->m_allStreamsSameTimeFraming == 1) {
600     FDK_ASSERT(pLatmDemux->m_numProgram <= LATM_MAX_PROG);
601     for (UINT prog = 0; prog < pLatmDemux->m_numProgram; prog++) {
602       FDK_ASSERT(pLatmDemux->m_numLayer[prog] <= LATM_MAX_LAYER);
603       for (UINT lay = 0; lay < pLatmDemux->m_numLayer[prog]; lay++) {
604         LATM_LAYER_INFO *p_linfo = &pLatmDemux->m_linfo[prog][lay];
605 
606         switch (p_linfo->m_frameLengthType) {
607           case 0:
608             p_linfo->m_frameLengthInBits = CLatmDemux_ReadAuChunkLengthInfo(bs);
609             totalPayloadBits += p_linfo->m_frameLengthInBits;
610             break;
611           case 3:
612           case 5:
613           case 7:
614           default:
615             return TRANSPORTDEC_PARSE_ERROR;  // AAC_DEC_LATM_INVALIDFRAMELENGTHTYPE;
616         }
617       }
618     }
619   } else {
620     ErrorStatus = TRANSPORTDEC_PARSE_ERROR;  // AAC_DEC_LATM_TIMEFRAMING;
621   }
622   if (pLatmDemux->m_audioMuxLengthBytes > (UINT)0 &&
623       totalPayloadBits > (int)pLatmDemux->m_audioMuxLengthBytes * 8) {
624     return TRANSPORTDEC_PARSE_ERROR;
625   }
626 
627   return (ErrorStatus);
628 }
629 
CLatmDemux_ReadAuChunkLengthInfo(HANDLE_FDK_BITSTREAM bs)630 int CLatmDemux_ReadAuChunkLengthInfo(HANDLE_FDK_BITSTREAM bs) {
631   UCHAR endFlag;
632   int len = 0;
633 
634   do {
635     UCHAR tmp = (UCHAR)FDKreadBits(bs, 8);
636     endFlag = (tmp < 255);
637 
638     len += tmp;
639 
640   } while (endFlag == 0);
641 
642   len <<= 3; /* convert from bytes to bits */
643 
644   return len;
645 }
646 
CLatmDemux_GetFrameLengthInBits(CLatmDemux * pLatmDemux,const UINT prog,const UINT layer)647 UINT CLatmDemux_GetFrameLengthInBits(CLatmDemux *pLatmDemux, const UINT prog,
648                                      const UINT layer) {
649   UINT nFrameLenBits = 0;
650   if (prog < pLatmDemux->m_numProgram) {
651     if (layer < pLatmDemux->m_numLayer[prog]) {
652       nFrameLenBits = pLatmDemux->m_linfo[prog][layer].m_frameLengthInBits;
653     }
654   }
655   return nFrameLenBits;
656 }
657 
CLatmDemux_GetOtherDataPresentFlag(CLatmDemux * pLatmDemux)658 UINT CLatmDemux_GetOtherDataPresentFlag(CLatmDemux *pLatmDemux) {
659   return pLatmDemux->m_otherDataPresent ? 1 : 0;
660 }
661 
CLatmDemux_GetOtherDataLength(CLatmDemux * pLatmDemux)662 UINT CLatmDemux_GetOtherDataLength(CLatmDemux *pLatmDemux) {
663   return pLatmDemux->m_otherDataLength;
664 }
665 
CLatmDemux_GetNrOfSubFrames(CLatmDemux * pLatmDemux)666 UINT CLatmDemux_GetNrOfSubFrames(CLatmDemux *pLatmDemux) {
667   return pLatmDemux->m_noSubFrames;
668 }
669 
CLatmDemux_GetNrOfLayers(CLatmDemux * pLatmDemux,const UINT prog)670 UINT CLatmDemux_GetNrOfLayers(CLatmDemux *pLatmDemux, const UINT prog) {
671   UINT numLayer = 0;
672   if (prog < pLatmDemux->m_numProgram) {
673     numLayer = pLatmDemux->m_numLayer[prog];
674   }
675   return numLayer;
676 }
677