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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-4 Transport Decoder  ***********************
85 
86    Author(s): Manuel Jander
87    Description: MPEG Transport decoder
88 
89 ******************************************************************************/
90 
91 #ifndef __TPDEC_LIB_H__
92 #define __TPDEC_LIB_H__
93 
94 #include "tp_data.h"
95 
96 #include "FDK_bitstream.h"
97 
98 #define TRANSPORTDEC_INBUF_SIZE  ( 8192 )   /*!< Size is in bytes.
99                                                  Set the transport input buffer size carefully and
100                                                  assure that it fulfills the requirements of the
101                                                  supported transport format(s).                    */
102 
103 typedef enum {
104   TRANSPORTDEC_OK = 0,             /*!< All fine.                                                  */
105 
106   /* Synchronization errors. Wait for new input data and try again. */
107   tpdec_sync_error_start   = 0x100,
108   TRANSPORTDEC_NOT_ENOUGH_BITS,    /*!< Out of bits. Provide more bits and try again.              */
109   TRANSPORTDEC_SYNC_ERROR,         /*!< No sync was found or sync got lost. Keep trying.           */
110   tpdec_sync_error_end,
111 
112   /* Decode errors. Mostly caused due to bit errors. */
113   tpdec_decode_error_start = 0x400,
114   TRANSPORTDEC_PARSE_ERROR,        /*!< Bitstream data showed inconsistencies (wrong syntax).      */
115   TRANSPORTDEC_UNSUPPORTED_FORMAT, /*!< Unsupported format or feature found in the bitstream data. */
116   TRANSPORTDEC_CRC_ERROR,          /*!< CRC error encountered in bitstream data.                   */
117   tpdec_decode_error_end,
118 
119   /* Fatal errors. Stop immediately on one of these errors! */
120   tpdec_fatal_error_start  = 0x200,
121   TRANSPORTDEC_UNKOWN_ERROR,       /*!< An unknown error occured.                                  */
122   TRANSPORTDEC_INVALID_PARAMETER,  /*!< An invalid parameter was passed to a function.             */
123   TRANSPORTDEC_NEED_TO_RESTART,    /*!< The decoder needs to be restarted, since the requiered
124                                         configuration change cannot be performed.                  */
125   tpdec_fatal_error_end
126 
127 } TRANSPORTDEC_ERROR;
128 
129 
130 /** Macro to identify decode errors. */
131 #define TPDEC_IS_DECODE_ERROR(err) ( ((err>=tpdec_decode_error_start) && (err<=tpdec_decode_error_end)) ? 1 : 0)
132 /** Macro to identify fatal errors. */
133 #define TPDEC_IS_FATAL_ERROR(err)  ( ((err>=tpdec_fatal_error_start)  && (err<=tpdec_fatal_error_end))  ? 1 : 0)
134 
135 
136 /**
137  * \brief Parameter identifiers for transportDec_SetParam()
138  */
139 typedef enum {
140   TPDEC_PARAM_MINIMIZE_DELAY = 1,        /** Delay minimization strategy. 0: none, 1: discard as many frames as possible. */
141   TPDEC_PARAM_EARLY_CONFIG,              /** Enable early config discovery. */
142   TPDEC_PARAM_IGNORE_BUFFERFULLNESS,     /** Ignore buffer fullness. */
143   TPDEC_PARAM_SET_BITRATE,               /** Set average bit rate for bit stream interruption frame misses estimation. */
144   TPDEC_PARAM_RESET,                     /** Reset transport decoder instance status. */
145   TPDEC_PARAM_BURST_PERIOD               /** Set data reception burst period in mili seconds. */
146 } TPDEC_PARAM;
147 
148 /* ISO/IEC 14496-3 4.4.1.1 Table 4.2 Program config element */
149 #define PC_FSB_CHANNELS_MAX 16 /* Front/Side/Back channels */
150 #define PC_LFE_CHANNELS_MAX 4
151 #define PC_ASSOCDATA_MAX    8
152 #define PC_CCEL_MAX         16 /* CC elements */
153 #define PC_COMMENTLENGTH    256
154 
155 
156 /*!
157   \brief               Reset Program Config Element.
158   \param pPce          Program Config Element structure.
159   \return              void
160 */
161 void  CProgramConfig_Reset ( CProgramConfig *pPce );
162 
163 /*!
164   \brief               Initialize Program Config Element.
165   \param pPce          Program Config Element structure.
166   \return              void
167 */
168 void  CProgramConfig_Init ( CProgramConfig *pPce );
169 
170 /*!
171   \brief               Inquire state of present Program Config Element structure.
172   \param pPce          Program Config Element structure.
173   \return              1 if the PCE structure is filled correct,
174                        0 if no valid PCE present.
175 */
176 int  CProgramConfig_IsValid ( const CProgramConfig *pPce );
177 
178 #ifdef TP_PCE_ENABLE
179 /*!
180   \brief               Read Program Config Element.
181   \param pPce          Program Config Element structure.
182   \param bs            Bitstream buffer to read from.
183   \param alignAnchor   Align bitstream to alignAnchor bits after all read operations.
184   \return              void
185 */
186 void  CProgramConfig_Read ( CProgramConfig       *pPce,
187                             HANDLE_FDK_BITSTREAM  bs,
188                             UINT                  alignAnchor );
189 #endif /* TP_PCE_ENABLE */
190 
191 /**
192  * \brief Lookup and verify a given element. The decoder calls this
193  *        method with every new element ID found in the bitstream.
194  *
195  * \param pPce        A valid Program config structure.
196  * \param tag         Tag of the current element to be looked up.
197  * \param channelIdx  The current channel count of the decoder parser.
198  * \param chMapping   Array to store the canonical channel mapping indexes.
199  * \param chType      Array to store the audio channel type.
200  * \param chIndex     Array to store the individual audio channel type index.
201  * \param elMapping   Pointer where the canonical element index is stored.
202  * \param elType      The element id of the current element to be looked up.
203  *
204  * \return            Non-zero if the element belongs to the current program, zero
205  *                    if it does not.
206  */
207 int CProgramConfig_LookupElement(
208         CProgramConfig *pPce,
209         const UINT      channelConfig,
210         const UINT      tag,
211         const UINT      channelIdx,
212         UCHAR           chMapping[],
213         AUDIO_CHANNEL_TYPE chType[],
214         UCHAR           chIndex[],
215         UCHAR          *elMapping,
216         MP4_ELEMENT_ID  elList[],
217         MP4_ELEMENT_ID  elType
218         );
219 
220 /**
221  * \brief        Get table of elements in canonical order.
222  * \param pPce   A valid program config structure.
223  * \param table  An array where the element IDs are stored.
224  * \return       Total element count including all SCE, CPE and LFE.
225  */
226 int CProgramConfig_GetElementTable( const CProgramConfig *pPce,
227                                     MP4_ELEMENT_ID  table[],
228                                     const INT elListSize );
229 
230 /**
231  * \brief       Initialize a given AudioSpecificConfig structure.
232  * \param pAsc  A pointer to an allocated CSAudioSpecificConfig struct.
233  * \return      void
234  */
235 void AudioSpecificConfig_Init(CSAudioSpecificConfig *pAsc);
236 
237 /**
238  * \brief   Parse a AudioSpecificConfig from a given bitstream handle.
239  *
240  * \param pAsc                         A pointer to an allocated CSAudioSpecificConfig struct.
241  * \param hBs                          Bitstream handle.
242  * \param fExplicitBackwardCompatible  Do explicit backward compatibility parsing if set (flag).
243  * \param cb pointer to structure holding callback information
244  *
245  * \return  Total element count including all SCE, CPE and LFE.
246  */
247 TRANSPORTDEC_ERROR AudioSpecificConfig_Parse(
248         CSAudioSpecificConfig *pAsc,
249         HANDLE_FDK_BITSTREAM hBs,
250         int fExplicitBackwardCompatible,
251         CSTpCallBacks *cb
252         );
253 
254 /* CELP stuff */
255 enum {
256   MPE     = 0,
257   RPE     = 1,
258   fs8KHz  = 0,
259   fs16KHz = 1
260 };
261 
262 /* Defintion of flags that can be passed to transportDecOpen() */
263 #define TP_FLAG_MPEG4 1
264 
265 /* Capability flags */
266 #define CAPF_TPDEC_ADIF        0x00001000  /**< Flag indicating support for ADIF transport format.        */
267 #define CAPF_TPDEC_ADTS        0x00002000  /**< Flag indicating support for ADTS transport format.        */
268 #define CAPF_TPDEC_LOAS        0x00004000  /**< Flag indicating support for LOAS transport format.        */
269 #define CAPF_TPDEC_LATM        0x00008000  /**< Flag indicating support for LATM transport format.        */
270 #define CAPF_TPDEC_RAWPACKETS  0x00010000  /**< Flag indicating support for raw packets transport format. */
271 
272 typedef struct TRANSPORTDEC *HANDLE_TRANSPORTDEC;
273 
274 
275 /**
276  * \brief Configure Transport Decoder via a binary coded AudioSpecificConfig or StreamMuxConfig.
277  *        The previously requested configuration callback will be called as well. The buffer conf
278  *        must containt a SMC in case of LOAS/LATM transport format, and an ASC elseways.
279  *
280  * \param hTp     Handle of a transport decoder.
281  * \param conf    UCHAR buffer of the binary coded config (ASC or SMC).
282  * \param length  The length in bytes of the conf buffer.
283  *
284  * \return        Error code.
285  */
286 TRANSPORTDEC_ERROR transportDec_OutOfBandConfig( const HANDLE_TRANSPORTDEC hTp,
287                                                  UCHAR              *conf,
288                                                  const UINT          length,
289                                                  const UINT          layer );
290 
291 /**
292  * \brief Open Transport medium for reading.
293  *
294  * \param transportDecFmt Format of the transport decoder medium to be accessed.
295  * \param flags           Transport decoder flags. Currently only TP_FLAG_MPEG4, which signals a
296  *                        MPEG4 capable decoder (relevant for ADTS only).
297  *
298  * \return   A pointer to a valid and allocated HANDLE_TRANSPORTDEC or a null pointer on failure.
299  */
300 HANDLE_TRANSPORTDEC transportDec_Open( TRANSPORT_TYPE transportDecFmt,
301                                        const UINT flags );
302 
303 /**
304  * \brief                Register configuration change callback.
305  * \param hTp            Handle of transport decoder.
306  * \param cbUpdateConfig Pointer to a callback function to handle audio config changes.
307  * \param user_data      void pointer for user data passed to the callback as first parameter.
308  * \return               0 on success.
309  */
310 int transportDec_RegisterAscCallback (
311         HANDLE_TRANSPORTDEC hTp,
312         const cbUpdateConfig_t cbUpdateConfig,
313         void* user_data );
314 
315 /**
316  * \brief                Register SSC parser callback.
317  * \param hTp            Handle of transport decoder.
318  * \param cbUpdateConfig Pointer to a callback function to handle SSC parsing.
319  * \param user_data      void pointer for user data passed to the callback as first parameter.
320  * \return               0 on success.
321  */
322 int transportDec_RegisterSscCallback (
323         HANDLE_TRANSPORTDEC hTp,
324         const cbSsc_t cbSscParse,
325         void* user_data );
326 
327 /**
328  * \brief                Register SBR header parser callback.
329  * \param hTp            Handle of transport decoder.
330  * \param cbUpdateConfig Pointer to a callback function to handle SBR header parsing.
331  * \param user_data      void pointer for user data passed to the callback as first parameter.
332  * \return               0 on success.
333  */
334 int transportDec_RegisterSbrCallback( HANDLE_TRANSPORTDEC hTpDec, const cbSbr_t cbSbr, void* user_data);
335 
336 /**
337  * \brief Fill internal input buffer with bitstream data from the external input buffer.
338  *  The function only copies such data as long as the decoder-internal input buffer is not full.
339  *  So it grabs whatever it can from pBuffer and returns information (bytesValid) so that at a
340  *  subsequent call of %transportDec_FillData(), the right position in pBuffer can be determined to
341  *  grab the next data.
342  *
343  * \param hTp         Handle of transportDec.
344  * \param pBuffer     Pointer to external input buffer.
345  * \param bufferSize  Size of external input buffer. This argument is required because decoder-internally
346  *                    we need the information to calculate the offset to pBuffer, where the next
347  *                    available data is, which is then fed into the decoder-internal buffer (as much
348  *                    as possible). Our example framework implementation fills the buffer at pBuffer
349  *                    again, once it contains no available valid bytes anymore (meaning bytesValid equal 0).
350  * \param bytesValid  Number of bitstream bytes in the external bitstream buffer that have not yet been
351  *                    copied into the decoder's internal bitstream buffer by calling this function.
352  *                    The value is updated according to the amount of newly copied bytes.
353  * \param layer       The layer the bitstream belongs to.
354  * \return            Error code.
355  */
356 TRANSPORTDEC_ERROR transportDec_FillData(
357         const HANDLE_TRANSPORTDEC  hTp,
358         UCHAR                     *pBuffer,
359         const UINT                 bufferSize,
360         UINT                      *pBytesValid,
361         const INT                  layer );
362 
363 /**
364  * \brief      Get transportDec bitstream handle.
365  * \param hTp  Pointer to a transport decoder handle.
366  * \return     HANDLE_FDK_BITSTREAM bitstream handle.
367  */
368 HANDLE_FDK_BITSTREAM transportDec_GetBitstream ( const HANDLE_TRANSPORTDEC hTp, const UINT layer );
369 
370 /**
371  * \brief      Get transport format.
372  * \param hTp  Pointer to a transport decoder handle.
373  * \return     The transport format.
374  */
375 TRANSPORT_TYPE transportDec_GetFormat ( const HANDLE_TRANSPORTDEC hTp );
376 
377 /**
378  * \brief Get the current buffer fullness value.
379  *
380  * \param hTp     Handle of a transport decoder.
381  *
382  * \return        Buffer fullness
383  */
384 INT transportDec_GetBufferFullness( const HANDLE_TRANSPORTDEC hTp );
385 
386 /**
387  * \brief       Close and deallocate transportDec.
388  * \param phTp  Pointer to a previously allocated transport decoder handle.
389  * \return      void
390  */
391 void transportDec_Close ( HANDLE_TRANSPORTDEC *phTp );
392 
393 /**
394  * \brief         Read one access unit from the transportDec medium.
395  * \param hTp     Handle of transportDec.
396  * \param length  On return, this value is overwritten with the actual access unit length in bits.
397  *                Set to -1 if length is unknown.
398  * \return        Error code.
399  */
400 TRANSPORTDEC_ERROR transportDec_ReadAccessUnit ( const HANDLE_TRANSPORTDEC hTp, const UINT layer );
401 
402 /**
403  * \brief Get the remaining amount of bits of the current access unit. The result
404  *        can be below zero, meaning that too many bits have been read.
405  * \param hTp     Handle of transportDec.
406  * \return amount of remaining bits.
407  */
408 INT transportDec_GetAuBitsRemaining( const HANDLE_TRANSPORTDEC hTp, const UINT layer );
409 
410 /**
411  * \brief Get the total amount of bits of the current access unit.
412  * \param hTp     Handle of transportDec.
413  * \return amount of total bits.
414  */
415 INT transportDec_GetAuBitsTotal( const HANDLE_TRANSPORTDEC hTp, const UINT layer );
416 
417 /**
418  * \brief      This function is required to be called when the decoder has finished parsing
419  *             one Access Unit for bitstream housekeeping.
420  * \param hTp  Transport Handle.
421  * \return     Error code.
422  */
423 TRANSPORTDEC_ERROR transportDec_EndAccessUnit ( const HANDLE_TRANSPORTDEC hTp );
424 
425 /**
426  * \brief      Obtain the amount of missing access units if applicable in case of
427  *             a bit stream synchronization error. Each time transportDec_ReadAccessUnit()
428  *             returns TRANSPORTDEC_SYNC_ERROR this function can be called to retrieve an estimate
429  *             of the amount of missing access units. This works only in case of constant average
430  *             bit rate (has to be known) and if the parameter TPDEC_PARAM_SET_BITRATE has been set
431  *             accordingly.
432  * \param hTp  Transport Handle.
433  * \param pNAccessUnits pointer to a memory location where the estimated lost frame count will be stored into.
434  * \return     Error code.
435  */
436 TRANSPORTDEC_ERROR transportDec_GetMissingAccessUnitCount ( INT *pNAccessUnits, HANDLE_TRANSPORTDEC hTp );
437 
438 
439 /**
440  * \brief        Set a given setting.
441  * \param hTp    Transport Handle.
442  * \param param  Identifier of the parameter to be changed.
443  * \param value  Value for the parameter to be changed.
444  * \return       Error code.
445  */
446 TRANSPORTDEC_ERROR transportDec_SetParam ( const HANDLE_TRANSPORTDEC hTp,
447                                            const TPDEC_PARAM         param,
448                                            const INT                 value );
449 
450 /**
451  * \brief        Get number of subframes (for LATM or ADTS)
452  * \param hTp    Transport Handle.
453  * \return       Number of ADTS/LATM subframes (return 1 for all other transport types).
454  */
455 UINT transportDec_GetNrOfSubFrames(HANDLE_TRANSPORTDEC hTp);
456 
457 
458 /**
459  * \brief       Get info structure of transport decoder library.
460  * \param info  A pointer to an allocated LIB_INFO struct.
461  * \return      Error code.
462  */
463 TRANSPORTDEC_ERROR transportDec_GetLibInfo( LIB_INFO *info );
464 
465 /* ADTS CRC support */
466 
467 /**
468  * \brief        Set current bitstream position as start of a new data region.
469  * \param hTp    Transport handle.
470  * \param mBits  Size in bits of the data region. Set to 0 if it should not be of a fixed size.
471  * \return       Data region ID, which should be used when calling transportDec_CrcEndReg().
472  */
473 int transportDec_CrcStartReg ( const HANDLE_TRANSPORTDEC hTp,
474                                const INT mBits );
475 
476 /**
477  * \brief        Set end of data region.
478  * \param hTp    Transport handle.
479  * \param reg    Data region ID, opbtained from transportDec_CrcStartReg().
480  * \return       void
481  */
482 void transportDec_CrcEndReg ( const HANDLE_TRANSPORTDEC hTp,
483                               const INT reg );
484 
485 /**
486  * \brief      Calculate ADTS crc and check if it is correct. The ADTS checksum is held internally.
487  * \param hTp  Transport handle.
488  * \return     Return TRANSPORTDEC_OK if the CRC is ok, or error if CRC is not correct.
489  */
490 TRANSPORTDEC_ERROR transportDec_CrcCheck ( const HANDLE_TRANSPORTDEC hTp );
491 
492 
493 #endif /* #ifndef __TPDEC_LIB_H__ */
494