1 /* ----------------------------------------------------------------------------- 2 Software License for The Fraunhofer FDK AAC Codec Library for Android 3 4 © Copyright 1995 - 2019 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 /**************************** AAC decoder library ****************************** 96 97 Author(s): Christian Griebel 98 99 Description: Dynamic range control (DRC) decoder tool for AAC 100 101 *******************************************************************************/ 102 103 #ifndef AACDEC_DRC_H 104 #define AACDEC_DRC_H 105 106 #include "tp_data.h" /* for program config element support */ 107 108 #include "aacdec_drc_types.h" 109 #include "channel.h" 110 #include "FDK_bitstream.h" 111 112 #define AACDEC_DRC_GAIN_SCALING (11) /* Scaling of DRC gains */ 113 #define AACDEC_DRC_GAIN_INIT_VALUE \ 114 (FL2FXCONST_DBL( \ 115 1.0f / (1 << AACDEC_DRC_GAIN_SCALING))) /* Init value for DRC gains */ 116 117 #define AACDEC_DRC_DFLT_EXPIRY_FRAMES \ 118 (0) /* Default DRC data expiry time in AAC frames */ 119 120 /* #define AACDEC_DRC_IGNORE_FRAMES_WITH_MULTIPLE_CH_THREADS */ /* The name says 121 it all. */ 122 /* #define AACDEC_DRC_DEBUG */ 123 124 /** 125 * \brief DRC module setting parameters 126 */ 127 typedef enum { 128 DRC_CUT_SCALE = 0, 129 DRC_BOOST_SCALE, 130 TARGET_REF_LEVEL, 131 DRC_BS_DELAY, 132 DRC_DATA_EXPIRY_FRAME, 133 APPLY_HEAVY_COMPRESSION, 134 DEFAULT_PRESENTATION_MODE, 135 ENCODER_TARGET_LEVEL, 136 MAX_OUTPUT_CHANNELS, 137 UNIDRC_PRECEDENCE 138 } AACDEC_DRC_PARAM; 139 140 /** 141 * \brief DRC module interface functions 142 */ 143 void aacDecoder_drcReset(HANDLE_AAC_DRC self); 144 145 void aacDecoder_drcInit(HANDLE_AAC_DRC self); 146 147 void aacDecoder_drcInitChannelData(CDrcChannelData *pDrcChannel); 148 149 AAC_DECODER_ERROR aacDecoder_drcSetParam(HANDLE_AAC_DRC self, 150 AACDEC_DRC_PARAM param, INT value); 151 152 int aacDecoder_drcMarkPayload(HANDLE_AAC_DRC self, HANDLE_FDK_BITSTREAM hBs, 153 AACDEC_DRC_PAYLOAD_TYPE type); 154 155 int aacDecoder_drcProlog( 156 HANDLE_AAC_DRC self, HANDLE_FDK_BITSTREAM hBs, 157 CAacDecoderStaticChannelInfo *pAacDecoderStaticChannelInfo[], 158 UCHAR pceInstanceTag, UCHAR channelMapping[], int validChannels); 159 160 /** 161 * \brief Apply DRC. If SBR is present, DRC data is handed over to the SBR 162 * decoder. 163 * \param self AAC decoder instance 164 * \param pSbrDec pointer to SBR decoder instance 165 * \param pAacDecoderChannelInfo AAC decoder channel instance to be processed 166 * \param pDrcDat DRC channel data 167 * \param extGain Pointer to a FIXP_DBL where a externally applyable gain will 168 * be stored into (independently on whether it will be apply internally or not). 169 * At function call the buffer must hold the scale (0 >= scale < 170 * DFRACT_BITS) to be applied on the gain value. 171 * \param ch channel index 172 * \param aacFrameSize AAC frame size 173 * \param bSbrPresent flag indicating that SBR is present, in which case DRC is 174 * handed over to the SBR instance pSbrDec 175 */ 176 void aacDecoder_drcApply(HANDLE_AAC_DRC self, void *pSbrDec, 177 CAacDecoderChannelInfo *pAacDecoderChannelInfo, 178 CDrcChannelData *pDrcDat, FIXP_DBL *extGain, int ch, 179 int aacFrameSize, int bSbrPresent); 180 181 int aacDecoder_drcEpilog( 182 HANDLE_AAC_DRC self, HANDLE_FDK_BITSTREAM hBs, 183 CAacDecoderStaticChannelInfo *pAacDecoderStaticChannelInfo[], 184 UCHAR pceInstanceTag, UCHAR channelMapping[], int validChannels); 185 186 /** 187 * \brief Get metadata information found in bitstream. 188 * \param self DRC module instance handle. 189 * \param pPresMode Pointer to field where the presentation mode will be written 190 * to. 191 * \param pProgRefLevel Pointer to field where the program reference level will 192 * be written to. 193 * \return Nothing. 194 */ 195 void aacDecoder_drcGetInfo(HANDLE_AAC_DRC self, SCHAR *pPresMode, 196 SCHAR *pProgRefLevel); 197 198 /** 199 * \brief Apply DRC Level Normalization. 200 * 201 * This function prepares/applies the gain values for the DRC Level 202 * Normalization and returns the exponent of the time data. The following two 203 * cases are handled: 204 * 205 * - Limiter enabled: 206 * The input data must be interleaved. 207 * One gain per sample is written to the buffer pGainPerSample. 208 * If necessary the time data is rescaled. 209 * 210 * - Limiter disabled: 211 * The input data can be interleaved or deinterleaved. 212 * The gain values are applied to the time data. 213 * If necessary the time data is rescaled. 214 * 215 * \param hDrcInfo [i/o] handle to drc data structure. 216 * \param samplesIn [i/o] pointer to time data. 217 * \param pGain [i ] pointer to gain to be applied to 218 * the time data. 219 * \param pGainPerSample [o ] pointer to the gain per sample to 220 * be applied to the time data in the limiter. 221 * \param gain_scale [i ] exponent to be applied to the time 222 * data. 223 * \param gain_delay [i ] delay[samples] with which the gains 224 * in pGain shall be applied (gain_delay <= nSamples). 225 * \param nSamples [i ] number of samples per frame. 226 * \param channels [i ] number of channels. 227 * \param stride [i ] channel stride of time data. 228 * \param limiterEnabled [i ] 1 if limiter is enabled, otherwise 229 * 0. 230 * 231 * \return exponent of time data 232 */ 233 INT applyDrcLevelNormalization(HANDLE_AAC_DRC hDrcInfo, PCM_DEC *samplesIn, 234 FIXP_DBL *pGain, FIXP_DBL *pGainPerSample, 235 const INT gain_scale, const UINT gain_delay, 236 const UINT nSamples, const UINT channels, 237 const UINT stride, const UINT limiterEnabled); 238 239 #endif /* AACDEC_DRC_H */ 240