1 2 /* ----------------------------------------------------------------------------------------------------------- 3 Software License for The Fraunhofer FDK AAC Codec Library for Android 4 5 Copyright 1995 - 2012 Fraunhofer-Gesellschaft zur Frderung 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 (at) iis.fraunhofer.de 82 ----------------------------------------------------------------------------------------------------------- */ 83 84 /***************************** MPEG-4 AAC Decoder ************************** 85 86 Author(s): Josef Hoepfl 87 Description: ADTS interface 88 89 ******************************************************************************/ 90 91 #ifndef TPDEC_ADTS_H 92 #define TPDEC_ADTS_H 93 94 #include "tpdec_lib.h" 95 96 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 ) 102 103 #ifdef CHECK_TWO_SYNCS 104 #define ADTS_MIN_TP_BUF_SIZE ( 8191 + 2 ) 105 #else 106 #define ADTS_MIN_TP_BUF_SIZE ( 8191 ) 107 #endif 108 109 #include "FDK_crc.h" 110 111 typedef struct { 112 /* ADTS header fields */ 113 UCHAR mpeg_id; 114 UCHAR layer; 115 UCHAR protection_absent; 116 UCHAR profile; 117 UCHAR sample_freq_index; 118 UCHAR private_bit; 119 UCHAR channel_config; 120 UCHAR original; 121 UCHAR home; 122 UCHAR copyright_id; 123 UCHAR copyright_start; 124 USHORT frame_length; 125 USHORT adts_fullness; 126 UCHAR num_raw_blocks; 127 UCHAR num_pce_bits; 128 } STRUCT_ADTS_BS; 129 130 struct STRUCT_ADTS { 131 132 STRUCT_ADTS_BS bs; 133 134 UCHAR decoderCanDoMpeg4; 135 UCHAR BufferFullnesStartFlag; 136 137 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 */ 140 } ; 141 142 typedef struct STRUCT_ADTS *HANDLE_ADTS; 143 144 /*! 145 \brief Initialize ADTS CRC 146 147 The function initialzes the crc buffer and the crc lookup table. 148 149 \return none 150 */ 151 void adtsRead_CrcInit( HANDLE_ADTS pAdts ); 152 153 /** 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. 160 * 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 164 * 165 * \return ID for the created region, -1 in case of an error 166 */ 167 int adtsRead_CrcStartReg( 168 HANDLE_ADTS pAdts, 169 HANDLE_FDK_BITSTREAM hBs, 170 int mBits 171 ); 172 173 /** 174 * \brief Ends CRC region identified by reg 175 * 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() 179 * 180 * \return none 181 */ 182 void adtsRead_CrcEndReg( 183 HANDLE_ADTS pAdts, 184 HANDLE_FDK_BITSTREAM hBs, 185 int reg 186 ); 187 188 /** 189 * \brief Check CRC 190 * 191 * Checks if the currently calculated CRC matches the CRC field read from the bitstream 192 * Deletes all CRC regions. 193 * 194 * \param pAdts ADTS data handle 195 * 196 * \return Returns 0 if they are identical otherwise 1 197 */ 198 TRANSPORTDEC_ERROR adtsRead_CrcCheck( HANDLE_ADTS pAdts ); 199 200 201 /** 202 * \brief Check if we have a valid ADTS frame at the current bitbuffer position 203 * 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. 207 * 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 210 * 211 * \return error status 212 */ 213 TRANSPORTDEC_ERROR adtsRead_DecodeHeader( 214 HANDLE_ADTS pAdts, 215 CSAudioSpecificConfig *pAsc, 216 HANDLE_FDK_BITSTREAM bs, 217 const INT ignoreBufferFullness 218 ); 219 220 /** 221 * \brief Get the raw data block length of the given block number. 222 * 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. 227 * 228 * \return error status 229 */ 230 int adtsRead_GetRawDataBlockLength( 231 HANDLE_ADTS pAdts, 232 INT blockNum 233 ); 234 235 236 #endif /* TPDEC_ADTS_H */ 237
