2 /* -----------------------------------------------------------------------------------------------------------
3 Software License for The Fraunhofer FDK AAC Codec Library for Android
5 © Copyright 1995 - 2013 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V.
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.
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.
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.
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.
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:
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.
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.
42 The name of Fraunhofer may not be used to endorse or promote products derived from this library without
43 prior written permission.
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.
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."
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.
59 You may use this FDK AAC Codec software or modifications thereto only for purposes that are authorized
60 by appropriate patent licenses.
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.
73 5. CONTACT INFORMATION
75 Fraunhofer Institute for Integrated Circuits IIS
76 Attention: Audio and Multimedia Departments - FDK AAC LL
78 91058 Erlangen, Germany
80 www.iis.fraunhofer.de/amm
81 amm-info@iis.fraunhofer.de
82 ----------------------------------------------------------------------------------------------------------- */
84 /***************************** MPEG-4 AAC Decoder **************************
86 Author(s): Josef Hoepfl
87 Description: ADTS interface
89 ******************************************************************************/
94 #include "tpdec_lib.h"
97 #define ADTS_SYNCWORD ( 0xfff )
98 #define ADTS_SYNCLENGTH ( 12 ) /* in bits */
99 #define ADTS_HEADERLENGTH ( 56 ) /* minimum header size in bits */
100 #define ADTS_FIXED_HEADERLENGTH ( 28 ) /* in bits */
101 #define ADTS_VARIABLE_HEADERLENGTH ( ADTS_HEADERLENGTH - ADTS_FIXED_HEADERLENGTH )
103 #ifdef CHECK_TWO_SYNCS
104 #define ADTS_MIN_TP_BUF_SIZE ( 8191 + 2 )
106 #define ADTS_MIN_TP_BUF_SIZE ( 8191 )
112 /* ADTS header fields */
115 UCHAR protection_absent
;
117 UCHAR sample_freq_index
;
119 UCHAR channel_config
;
123 UCHAR copyright_start
;
125 USHORT adts_fullness
;
126 UCHAR num_raw_blocks
;
134 UCHAR decoderCanDoMpeg4
;
135 UCHAR BufferFullnesStartFlag
;
137 FDK_CRCINFO crcInfo
; /* CRC state info */
138 USHORT crcReadValue
; /* CRC value read from bitstream data */
139 USHORT rawDataBlockDist
[4]; /* distance between each raw data block. Not the same as found in the bitstream */
142 typedef struct STRUCT_ADTS
*HANDLE_ADTS
;
145 \brief Initialize ADTS CRC
147 The function initialzes the crc buffer and the crc lookup table.
151 void adtsRead_CrcInit( HANDLE_ADTS pAdts
);
154 * \brief Starts CRC region with a maximum number of bits
155 * If mBits is positive zero padding will be used for CRC calculation, if there
156 * are less than mBits bits available.
157 * If mBits is negative no zero padding is done.
158 * If mBits is zero the memory for the buffer is allocated dynamically, the
159 * number of bits is not limited.
161 * \param pAdts ADTS data handle
162 * \param hBs bitstream handle, on which the CRC region referes to
163 * \param mBits max number of bits in crc region to be considered
165 * \return ID for the created region, -1 in case of an error
167 int adtsRead_CrcStartReg(
169 HANDLE_FDK_BITSTREAM hBs
,
174 * \brief Ends CRC region identified by reg
176 * \param pAdts ADTS data handle
177 * \param hBs bitstream handle, on which the CRC region referes to
178 * \param reg CRC regions ID returned by adtsRead_CrcStartReg()
182 void adtsRead_CrcEndReg(
184 HANDLE_FDK_BITSTREAM hBs
,
191 * Checks if the currently calculated CRC matches the CRC field read from the bitstream
192 * Deletes all CRC regions.
194 * \param pAdts ADTS data handle
196 * \return Returns 0 if they are identical otherwise 1
198 TRANSPORTDEC_ERROR
adtsRead_CrcCheck( HANDLE_ADTS pAdts
);
202 * \brief Check if we have a valid ADTS frame at the current bitbuffer position
204 * This function assumes enough bits in buffer for the current frame.
205 * It reads out the header bits to prepare the bitbuffer for the decode loop.
206 * In case the header bits show an invalid bitstream/frame, the whole frame is skipped.
208 * \param pAdts ADTS data handle which is filled with parsed ADTS header data
209 * \param bs handle of bitstream from whom the ADTS header is read
211 * \return error status
213 TRANSPORTDEC_ERROR
adtsRead_DecodeHeader(
215 CSAudioSpecificConfig
*pAsc
,
216 HANDLE_FDK_BITSTREAM bs
,
217 const INT ignoreBufferFullness
221 * \brief Get the raw data block length of the given block number.
223 * \param pAdts ADTS data handle
224 * \param blockNum current raw data block index
225 * \param pLength pointer to an INT where the length of the given raw data block is stored into
226 * the returned value might be -1, in which case the raw data block length is unknown.
228 * \return error status
230 int adtsRead_GetRawDataBlockLength(
236 #endif /* TPDEC_ADTS_H */