mirror of https://github.com/mstorsjo/fdk-aac.git
242 lines
10 KiB
C
242 lines
10 KiB
C
/* -----------------------------------------------------------------------------
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Software License for The Fraunhofer FDK AAC Codec Library for Android
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© Copyright 1995 - 2020 Fraunhofer-Gesellschaft zur Förderung der angewandten
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Forschung e.V. All rights reserved.
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1. INTRODUCTION
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The Fraunhofer FDK AAC Codec Library for Android ("FDK AAC Codec") is software
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that implements the MPEG Advanced Audio Coding ("AAC") encoding and decoding
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scheme for digital audio. This FDK AAC Codec software is intended to be used on
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a wide variety of Android devices.
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AAC's HE-AAC and HE-AAC v2 versions are regarded as today's most efficient
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general perceptual audio codecs. AAC-ELD is considered the best-performing
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full-bandwidth communications codec by independent studies and is widely
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deployed. AAC has been standardized by ISO and IEC as part of the MPEG
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specifications.
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Patent licenses for necessary patent claims for the FDK AAC Codec (including
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those of Fraunhofer) may be obtained through Via Licensing
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(www.vialicensing.com) or through the respective patent owners individually for
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the purpose of encoding or decoding bit streams in products that are compliant
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with the ISO/IEC MPEG audio standards. Please note that most manufacturers of
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Android devices already license these patent claims through Via Licensing or
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directly from the patent owners, and therefore FDK AAC Codec software may
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already be covered under those patent licenses when it is used for those
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licensed purposes only.
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Commercially-licensed AAC software libraries, including floating-point versions
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with enhanced sound quality, are also available from Fraunhofer. Users are
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encouraged to check the Fraunhofer website for additional applications
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information and documentation.
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2. COPYRIGHT LICENSE
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Redistribution and use in source and binary forms, with or without modification,
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are permitted without payment of copyright license fees provided that you
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satisfy the following conditions:
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You must retain the complete text of this software license in redistributions of
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the FDK AAC Codec or your modifications thereto in source code form.
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You must retain the complete text of this software license in the documentation
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and/or other materials provided with redistributions of the FDK AAC Codec or
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your modifications thereto in binary form. You must make available free of
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charge copies of the complete source code of the FDK AAC Codec and your
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modifications thereto to recipients of copies in binary form.
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The name of Fraunhofer may not be used to endorse or promote products derived
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from this library without prior written permission.
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You may not charge copyright license fees for anyone to use, copy or distribute
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the FDK AAC Codec software or your modifications thereto.
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Your modified versions of the FDK AAC Codec must carry prominent notices stating
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that you changed the software and the date of any change. For modified versions
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of the FDK AAC Codec, the term "Fraunhofer FDK AAC Codec Library for Android"
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must be replaced by the term "Third-Party Modified Version of the Fraunhofer FDK
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AAC Codec Library for Android."
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3. NO PATENT LICENSE
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NO EXPRESS OR IMPLIED LICENSES TO ANY PATENT CLAIMS, including without
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limitation the patents of Fraunhofer, ARE GRANTED BY THIS SOFTWARE LICENSE.
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Fraunhofer provides no warranty of patent non-infringement with respect to this
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software.
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You may use this FDK AAC Codec software or modifications thereto only for
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purposes that are authorized by appropriate patent licenses.
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4. DISCLAIMER
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This FDK AAC Codec software is provided by Fraunhofer on behalf of the copyright
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holders and contributors "AS IS" and WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES,
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including but not limited to the implied warranties of merchantability and
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fitness for a particular purpose. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
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CONTRIBUTORS BE LIABLE for any direct, indirect, incidental, special, exemplary,
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or consequential damages, including but not limited to procurement of substitute
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goods or services; loss of use, data, or profits, or business interruption,
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however caused and on any theory of liability, whether in contract, strict
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liability, or tort (including negligence), arising in any way out of the use of
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this software, even if advised of the possibility of such damage.
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5. CONTACT INFORMATION
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Fraunhofer Institute for Integrated Circuits IIS
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Attention: Audio and Multimedia Departments - FDK AAC LL
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Am Wolfsmantel 33
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91058 Erlangen, Germany
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www.iis.fraunhofer.de/amm
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amm-info@iis.fraunhofer.de
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----------------------------------------------------------------------------- */
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/**************************** AAC decoder library ******************************
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Author(s): Christian Griebel
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Description: Dynamic range control (DRC) decoder tool for AAC
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*******************************************************************************/
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#ifndef AACDEC_DRC_H
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#define AACDEC_DRC_H
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#include "tp_data.h" /* for program config element support */
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#include "aacdec_drc_types.h"
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#include "channel.h"
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#include "FDK_bitstream.h"
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#define AACDEC_DRC_GAIN_SCALING (11) /* Scaling of DRC gains */
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#define AACDEC_DRC_GAIN_INIT_VALUE \
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(FL2FXCONST_DBL( \
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1.0f / (1 << AACDEC_DRC_GAIN_SCALING))) /* Init value for DRC gains */
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#define AACDEC_DRC_DFLT_EXPIRY_FRAMES \
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(0) /* Default DRC data expiry time in AAC frames */
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/* #define AACDEC_DRC_IGNORE_FRAMES_WITH_MULTIPLE_CH_THREADS */ /* The name says
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it all. */
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/* #define AACDEC_DRC_DEBUG */
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/**
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* \brief DRC module setting parameters
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*/
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typedef enum {
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DRC_CUT_SCALE = 0,
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DRC_BOOST_SCALE,
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TARGET_REF_LEVEL,
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DRC_BS_DELAY,
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DRC_DATA_EXPIRY_FRAME,
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APPLY_HEAVY_COMPRESSION,
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DEFAULT_PRESENTATION_MODE,
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ENCODER_TARGET_LEVEL,
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MAX_OUTPUT_CHANNELS,
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UNIDRC_PRECEDENCE
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} AACDEC_DRC_PARAM;
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/**
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* \brief DRC module interface functions
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*/
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void aacDecoder_drcDisable(HANDLE_AAC_DRC self);
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void aacDecoder_drcReset(HANDLE_AAC_DRC self);
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void aacDecoder_drcInit(HANDLE_AAC_DRC self);
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void aacDecoder_drcInitChannelData(CDrcChannelData *pDrcChannel);
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AAC_DECODER_ERROR aacDecoder_drcSetParam(HANDLE_AAC_DRC self,
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AACDEC_DRC_PARAM param, INT value);
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int aacDecoder_drcMarkPayload(HANDLE_AAC_DRC self, HANDLE_FDK_BITSTREAM hBs,
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AACDEC_DRC_PAYLOAD_TYPE type);
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int aacDecoder_drcProlog(
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HANDLE_AAC_DRC self, HANDLE_FDK_BITSTREAM hBs,
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CAacDecoderStaticChannelInfo *pAacDecoderStaticChannelInfo[],
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UCHAR pceInstanceTag, UCHAR channelMapping[], int validChannels);
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/**
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* \brief Apply DRC. If SBR is present, DRC data is handed over to the SBR
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* decoder.
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* \param self AAC decoder instance
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* \param pSbrDec pointer to SBR decoder instance
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* \param pAacDecoderChannelInfo AAC decoder channel instance to be processed
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* \param pDrcDat DRC channel data
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* \param extGain Pointer to a FIXP_DBL where a externally applyable gain will
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* be stored into (independently on whether it will be apply internally or not).
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* At function call the buffer must hold the scale (0 >= scale <
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* DFRACT_BITS) to be applied on the gain value.
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* \param ch channel index
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* \param aacFrameSize AAC frame size
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* \param bSbrPresent flag indicating that SBR is present, in which case DRC is
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* handed over to the SBR instance pSbrDec
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*/
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void aacDecoder_drcApply(HANDLE_AAC_DRC self, void *pSbrDec,
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CAacDecoderChannelInfo *pAacDecoderChannelInfo,
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CDrcChannelData *pDrcDat, FIXP_DBL *extGain, int ch,
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int aacFrameSize, int bSbrPresent);
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int aacDecoder_drcEpilog(
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HANDLE_AAC_DRC self, HANDLE_FDK_BITSTREAM hBs,
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CAacDecoderStaticChannelInfo *pAacDecoderStaticChannelInfo[],
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UCHAR pceInstanceTag, UCHAR channelMapping[], int validChannels);
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/**
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* \brief Get metadata information found in bitstream.
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* \param self DRC module instance handle.
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* \param pPresMode Pointer to field where the presentation mode will be written
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* to.
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* \param pProgRefLevel Pointer to field where the program reference level will
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* be written to.
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* \return Nothing.
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*/
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void aacDecoder_drcGetInfo(HANDLE_AAC_DRC self, SCHAR *pPresMode,
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SCHAR *pProgRefLevel);
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/**
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* \brief Apply DRC Level Normalization.
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*
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* This function prepares/applies the gain values for the DRC Level
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* Normalization and returns the exponent of the time data. The following two
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* cases are handled:
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*
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* - Limiter enabled:
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* The input data must be interleaved.
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* One gain per sample is written to the buffer pGainPerSample.
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* If necessary the time data is rescaled.
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*
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* - Limiter disabled:
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* The input data can be interleaved or deinterleaved.
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* The gain values are applied to the time data.
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* If necessary the time data is rescaled.
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*
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* \param hDrcInfo [i/o] handle to drc data structure.
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* \param samplesIn [i/o] pointer to time data.
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* \param pGain [i ] pointer to gain to be applied to
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* the time data.
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* \param pGainPerSample [o ] pointer to the gain per sample to
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* be applied to the time data in the limiter.
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* \param gain_scale [i ] exponent to be applied to the time
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* data.
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* \param gain_delay [i ] delay[samples] with which the gains
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* in pGain shall be applied (gain_delay <= nSamples).
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* \param nSamples [i ] number of samples per frame.
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* \param channels [i ] number of channels.
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* \param stride [i ] channel stride of time data.
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* \param limiterEnabled [i ] 1 if limiter is enabled, otherwise
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* 0.
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*
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* \return exponent of time data
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*/
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INT applyDrcLevelNormalization(HANDLE_AAC_DRC hDrcInfo, PCM_DEC *samplesIn,
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FIXP_DBL *pGain, FIXP_DBL *pGainPerSample,
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const INT gain_scale, const UINT gain_delay,
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const UINT nSamples, const UINT channels,
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const UINT stride, const UINT limiterEnabled);
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#endif /* AACDEC_DRC_H */
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