/* ----------------------------------------------------------------------------- Software License for The Fraunhofer FDK AAC Codec Library for Android © Copyright 1995 - 2023 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. All rights reserved. 1. INTRODUCTION The Fraunhofer FDK AAC Codec Library for Android ("FDK AAC Codec") is software that implements the MPEG Advanced Audio Coding ("AAC") encoding and decoding scheme for digital audio. This FDK AAC Codec software is intended to be used on a wide variety of Android devices. AAC's HE-AAC and HE-AAC v2 versions are regarded as today's most efficient general perceptual audio codecs. AAC-ELD is considered the best-performing full-bandwidth communications codec by independent studies and is widely deployed. AAC has been standardized by ISO and IEC as part of the MPEG specifications. Patent licenses for necessary patent claims for the FDK AAC Codec (including those of Fraunhofer) may be obtained through Via Licensing (www.vialicensing.com) or through the respective patent owners individually for the purpose of encoding or decoding bit streams in products that are compliant with the ISO/IEC MPEG audio standards. Please note that most manufacturers of Android devices already license these patent claims through Via Licensing or directly from the patent owners, and therefore FDK AAC Codec software may already be covered under those patent licenses when it is used for those licensed purposes only. Commercially-licensed AAC software libraries, including floating-point versions with enhanced sound quality, are also available from Fraunhofer. Users are encouraged to check the Fraunhofer website for additional applications information and documentation. 2. COPYRIGHT LICENSE Redistribution and use in source and binary forms, with or without modification, are permitted without payment of copyright license fees provided that you satisfy the following conditions: You must retain the complete text of this software license in redistributions of the FDK AAC Codec or your modifications thereto in source code form. You must retain the complete text of this software license in the documentation and/or other materials provided with redistributions of the FDK AAC Codec or your modifications thereto in binary form. You must make available free of charge copies of the complete source code of the FDK AAC Codec and your modifications thereto to recipients of copies in binary form. The name of Fraunhofer may not be used to endorse or promote products derived from this library without prior written permission. You may not charge copyright license fees for anyone to use, copy or distribute the FDK AAC Codec software or your modifications thereto. Your modified versions of the FDK AAC Codec must carry prominent notices stating that you changed the software and the date of any change. For modified versions of the FDK AAC Codec, the term "Fraunhofer FDK AAC Codec Library for Android" must be replaced by the term "Third-Party Modified Version of the Fraunhofer FDK AAC Codec Library for Android." 3. NO PATENT LICENSE NO EXPRESS OR IMPLIED LICENSES TO ANY PATENT CLAIMS, including without limitation the patents of Fraunhofer, ARE GRANTED BY THIS SOFTWARE LICENSE. Fraunhofer provides no warranty of patent non-infringement with respect to this software. You may use this FDK AAC Codec software or modifications thereto only for purposes that are authorized by appropriate patent licenses. 4. DISCLAIMER This FDK AAC Codec software is provided by Fraunhofer on behalf of the copyright holders and contributors "AS IS" and WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES, including but not limited to the implied warranties of merchantability and fitness for a particular purpose. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE for any direct, indirect, incidental, special, exemplary, or consequential damages, including but not limited to procurement of substitute goods or services; loss of use, data, or profits, or business interruption, however caused and on any theory of liability, whether in contract, strict liability, or tort (including negligence), arising in any way out of the use of this software, even if advised of the possibility of such damage. 5. CONTACT INFORMATION Fraunhofer Institute for Integrated Circuits IIS Attention: Audio and Multimedia Departments - FDK AAC LL Am Wolfsmantel 33 91058 Erlangen, Germany www.iis.fraunhofer.de/amm amm-info@iis.fraunhofer.de ----------------------------------------------------------------------------- */ /**************************** AAC decoder library ****************************** Author(s): Christian Griebel Description: Dynamic range control (DRC) decoder tool for AAC *******************************************************************************/ #ifndef AACDEC_DRC_H #define AACDEC_DRC_H #include "tp_data.h" /* for program config element support */ #include "aacdec_drc_types.h" #include "channel.h" #include "FDK_bitstream.h" #define AACDEC_DRC_GAIN_SCALING (11) /* Scaling of DRC gains */ #define AACDEC_DRC_GAIN_INIT_VALUE \ (FL2FXCONST_DBL( \ 1.0f / (1 << AACDEC_DRC_GAIN_SCALING))) /* Init value for DRC gains */ #define AACDEC_DRC_DFLT_EXPIRY_FRAMES \ (0) /* Default DRC data expiry time in AAC frames */ /* #define AACDEC_DRC_IGNORE_FRAMES_WITH_MULTIPLE_CH_THREADS */ /* The name says it all. */ /* #define AACDEC_DRC_DEBUG */ /** * \brief DRC module setting parameters */ typedef enum { DRC_CUT_SCALE = 0, DRC_BOOST_SCALE, TARGET_REF_LEVEL, DRC_BS_DELAY, DRC_DATA_EXPIRY_FRAME, APPLY_HEAVY_COMPRESSION, DEFAULT_PRESENTATION_MODE, ENCODER_TARGET_LEVEL, MAX_OUTPUT_CHANNELS } AACDEC_DRC_PARAM; /** * \brief DRC module interface functions */ void aacDecoder_drcDisable(HANDLE_AAC_DRC self); void aacDecoder_drcReset(HANDLE_AAC_DRC self); void aacDecoder_drcInit(HANDLE_AAC_DRC self); void aacDecoder_drcInitChannelData(CDrcChannelData *pDrcChannel); AAC_DECODER_ERROR aacDecoder_drcSetParam(HANDLE_AAC_DRC self, AACDEC_DRC_PARAM param, INT value); int aacDecoder_drcMarkPayload(HANDLE_AAC_DRC self, HANDLE_FDK_BITSTREAM hBs, AACDEC_DRC_PAYLOAD_TYPE type); int aacDecoder_drcProlog( HANDLE_AAC_DRC self, HANDLE_FDK_BITSTREAM hBs, CAacDecoderStaticChannelInfo *pAacDecoderStaticChannelInfo[], UCHAR pceInstanceTag, UCHAR channelMapping[], int validChannels); /** * \brief Apply DRC. If SBR is present, DRC data is handed over to the SBR * decoder. * \param self AAC decoder instance * \param pSbrDec pointer to SBR decoder instance * \param pAacDecoderChannelInfo AAC decoder channel instance to be processed * \param pDrcDat DRC channel data * \param extGain Pointer to a FIXP_DBL where a externally applyable gain will * be stored into (independently on whether it will be apply internally or not). * At function call the buffer must hold the scale (0 >= scale < * DFRACT_BITS) to be applied on the gain value. * \param ch channel index * \param aacFrameSize AAC frame size * \param bSbrPresent flag indicating that SBR is present, in which case DRC is * handed over to the SBR instance pSbrDec */ void aacDecoder_drcApply(HANDLE_AAC_DRC self, void *pSbrDec, CAacDecoderChannelInfo *pAacDecoderChannelInfo, CDrcChannelData *pDrcDat, FIXP_DBL *extGain, int ch, int aacFrameSize, int bSbrPresent); int aacDecoder_drcEpilog( HANDLE_AAC_DRC self, HANDLE_FDK_BITSTREAM hBs, CAacDecoderStaticChannelInfo *pAacDecoderStaticChannelInfo[], UCHAR pceInstanceTag, UCHAR channelMapping[], int validChannels); /** * \brief Get metadata information found in bitstream. * \param self DRC module instance handle. * \param pPresMode Pointer to field where the presentation mode will be written * to. * \param pProgRefLevel Pointer to field where the program reference level will * be written to. * \return Nothing. */ void aacDecoder_drcGetInfo(HANDLE_AAC_DRC self, SCHAR *pPresMode, SCHAR *pProgRefLevel); /** * \brief Apply DRC Level Normalization. * * This function prepares/applies the gain values for the DRC Level * Normalization and returns the exponent of the time data. The following two * cases are handled: * * - Limiter enabled: * The input data must be interleaved. * One gain per sample is written to the buffer pGainPerSample. * If necessary the time data is rescaled. * * - Limiter disabled: * The input data can be interleaved or deinterleaved. * The gain values are applied to the time data. * If necessary the time data is rescaled. * * \param hDrcInfo [i/o] handle to drc data structure. * \param samplesIn [i/o] pointer to time data. * \param pGain [i ] pointer to gain to be applied to * the time data. * \param pGainPerSample [o ] pointer to the gain per sample to * be applied to the time data in the limiter. * \param gain_scale [i ] exponent to be applied to the time * data. * \param gain_delay [i ] delay[samples] with which the gains * in pGain shall be applied (gain_delay <= nSamples). * \param nSamples [i ] number of samples per frame. * \param channels [i ] number of channels. * \param stride [i ] channel stride of time data. * \param limiterEnabled [i ] 1 if limiter is enabled, otherwise * 0. * * \return exponent of time data */ INT applyDrcLevelNormalization(HANDLE_AAC_DRC hDrcInfo, PCM_DEC *samplesIn, FIXP_DBL *pGain, FIXP_DBL *pGainPerSample, const INT gain_scale, const UINT gain_delay, const UINT nSamples, const UINT channels, const UINT stride, const UINT limiterEnabled); #endif /* AACDEC_DRC_H */