1 /* ----------------------------------------------------------------------------- 2 Software License for The Fraunhofer FDK AAC Codec Library for Android 3 4 Copyright 1995 - 2018 Fraunhofer-Gesellschaft zur Frderung 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 (at) iis.fraunhofer.de 93 ----------------------------------------------------------------------------- */ 94 95 /**************************** AAC decoder library ****************************** 96 97 Author(s): Manuel Jander 98 99 Description: USAC Linear Prediction Domain coding 100 101 *******************************************************************************/ 102 103 #ifndef USACDEC_LPD_H 104 #define USACDEC_LPD_H 105 106 #include "channelinfo.h" 107 108 #define OPTIMIZE_AVG_PERFORMANCE 109 110 /** 111 * \brief read a lpd_channel_stream. 112 * \param hBs a bit stream handle, where the lpd_channel_stream is located. 113 * \param pAacDecoderChannelInfo the channel context structure for storing read 114 * data. 115 * \param flags bit stream syntax flags. 116 * \return AAC_DECODER_ERROR error code. 117 */ 118 AAC_DECODER_ERROR CLpdChannelStream_Read( 119 HANDLE_FDK_BITSTREAM hBs, CAacDecoderChannelInfo *pAacDecoderChannelInfo, 120 CAacDecoderStaticChannelInfo *pAacDecoderStaticChannelInfo, 121 const SamplingRateInfo *pSamplingRateInfo, UINT flags); 122 123 /** 124 * \brief decode one lpd_channel_stream and render the audio output. 125 * \param pAacDecoderChannelInfo struct holding the channel information to be 126 * rendered. 127 * \param pAacDecoderStaticChannelInfo struct holding the persistent channel 128 * information to be rendered. 129 * \param pSamplingRateInfo holds the sampling rate information 130 * \param elFlags holds the internal decoder flags 131 */ 132 void CLpdChannelStream_Decode( 133 CAacDecoderChannelInfo *pAacDecoderChannelInfo, 134 CAacDecoderStaticChannelInfo *pAacDecoderStaticChannelInfo, UINT flags); 135 136 /** 137 * \brief generate time domain output signal for LPD channel streams 138 * \param pAacDecoderStaticChannelInfo 139 * \param pAacDecoderChannelInfo 140 * \param pTimeData pointer to output buffer 141 * \param samplesPerFrame amount of output samples 142 * \param pSamplingRateInfo holds the sampling rate information 143 * \param pWorkBuffer1 pointer to work buffer for temporal data 144 */ 145 AAC_DECODER_ERROR CLpd_RenderTimeSignal( 146 CAacDecoderStaticChannelInfo *pAacDecoderStaticChannelInfo, 147 CAacDecoderChannelInfo *pAacDecoderChannelInfo, FIXP_PCM *pTimeData, 148 INT samplesPerFrame, SamplingRateInfo *pSamplingRateInfo, UINT frameOk, 149 UINT flags, UINT strmFlags); 150 151 static inline INT CLpd_FAC_getLength(int fNotShortBlock, int fac_length_long) { 152 if (fNotShortBlock) { 153 return (fac_length_long); 154 } else { 155 return fac_length_long / 2; 156 } 157 } 158 159 void filtLP(const FIXP_DBL *syn, FIXP_PCM *syn_out, FIXP_DBL *noise, 160 const FIXP_SGL *filt, INT stop, int len); 161 162 /** 163 * \brief perform a low-frequency pitch enhancement on time domain signal 164 * \param[in] syn pointer to time domain input signal 165 * \param[in] synFB pointer to time domain input signal 166 * \param[in] upsampling factor 167 * \param[in] T_sf array with past decoded pitch period values for each subframe 168 * \param[in] non_zero_gain_flags indicates whether pitch gains of past 169 * subframes are zero or not, msb -> [1 BPF_DELAY subfr][7 SYN_DELAY subfr][16 170 * new subfr] <- lsb 171 * \param[in] l_frame length of filtering, must be multiple of L_SUBFR 172 * \param[in] l_next length of allowed look ahead on syn[i], i < l_frame+l_next 173 * \param[out] synth_out pointer to time domain output signal 174 * \param[in,out] mem_bpf pointer to filter memory (L_FILT+L_SUBFR) 175 */ 176 177 void bass_pf_1sf_delay(FIXP_DBL syn[], const INT T_sf[], FIXP_DBL *pit_gain, 178 const int frame_length, const INT l_frame, 179 const INT l_next, FIXP_PCM *synth_out, 180 FIXP_DBL mem_bpf[]); 181 182 /** 183 * \brief random sign generator for FD and TCX noise filling 184 * \param[in,out] seed pointer to random seed 185 * \return if return value is zero use positive sign 186 * \Note: This code is also implemented as a copy in block.cpp, grep for 187 * "UsacRandomSign" 188 */ 189 FDK_INLINE 190 int UsacRandomSign(ULONG *seed) { 191 *seed = (ULONG)((UINT64)(*seed) * 69069 + 5); 192 193 return (int)((*seed) & 0x10000); 194 } 195 196 void CFdp_Reset(CAacDecoderStaticChannelInfo *pAacDecoderStaticChannelInfo); 197 198 #endif /* USACDEC_LPD_H */ 199
