186 lines
8.3 KiB
C
186 lines
8.3 KiB
C
/* -----------------------------------------------------------------------------
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Software License for The Fraunhofer FDK AAC Codec Library for Android
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© Copyright 1995 - 2018 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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/**************************** SBR encoder library ******************************
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Author(s):
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Description:
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*******************************************************************************/
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/*!
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\file
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\brief Noise floor estimation structs and prototypes $Revision: 92790 $
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*/
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#ifndef NF_EST_H
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#define NF_EST_H
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#include "sbr_encoder.h"
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#include "fram_gen.h"
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#define NF_SMOOTHING_LENGTH 4 /*!< Smoothing length of the noise floors. */
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typedef struct {
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FIXP_DBL
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prevNoiseLevels[NF_SMOOTHING_LENGTH]
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[MAX_NUM_NOISE_VALUES]; /*!< The previous noise levels. */
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FIXP_DBL noiseFloorOffset
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[MAX_NUM_NOISE_VALUES]; /*!< Noise floor offset, scaled with
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NOISE_FLOOR_OFFSET_SCALING */
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const FIXP_DBL *smoothFilter; /*!< Smoothing filter to use. */
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FIXP_DBL ana_max_level; /*!< Max level allowed. */
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FIXP_DBL weightFac; /*!< Weightening factor for the difference between orig
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and sbr. */
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INT freqBandTableQmf[MAX_NUM_NOISE_VALUES +
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1]; /*!< Frequncy band table for the noise floor bands.*/
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INT noNoiseBands; /*!< Number of noisebands. */
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INT noiseBands; /*!< NoiseBands switch 4 bit.*/
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INT timeSlots; /*!< Number of timeslots in a frame. */
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INVF_MODE diffThres; /*!< Threshold value to control the inverse filtering
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decision */
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} SBR_NOISE_FLOOR_ESTIMATE;
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typedef SBR_NOISE_FLOOR_ESTIMATE *HANDLE_SBR_NOISE_FLOOR_ESTIMATE;
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void FDKsbrEnc_sbrNoiseFloorEstimateQmf(
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HANDLE_SBR_NOISE_FLOOR_ESTIMATE
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h_sbrNoiseFloorEstimate, /*!< Handle to SBR_NOISE_FLOOR_ESTIMATE struct
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*/
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const SBR_FRAME_INFO
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*frame_info, /*!< Time frequency grid of the current frame. */
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FIXP_DBL
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*noiseLevels, /*!< Pointer to vector to store the noise levels in.*/
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FIXP_DBL **quotaMatrixOrig, /*!< Matrix holding the quota values of the
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original. */
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SCHAR *indexVector, /*!< Index vector to obtain the patched data. */
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INT missingHarmonicsFlag, /*!< Flag indicating if a strong tonal component
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will be missing. */
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INT startIndex, /*!< Start index. */
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UINT numberOfEstimatesPerFrame, /*!< The number of tonality estimates per
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frame. */
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INT transientFrame, /*!< A flag indicating if a transient is present. */
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INVF_MODE *pInvFiltLevels, /*!< Pointer to the vector holding the inverse
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filtering levels. */
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UINT sbrSyntaxFlags);
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INT FDKsbrEnc_InitSbrNoiseFloorEstimate(
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HANDLE_SBR_NOISE_FLOOR_ESTIMATE
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h_sbrNoiseFloorEstimate, /*!< Handle to SBR_NOISE_FLOOR_ESTIMATE struct
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*/
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INT ana_max_level, /*!< Maximum level of the adaptive noise. */
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const UCHAR *freqBandTable, /*!< Frequany band table. */
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INT nSfb, /*!< Number of frequency bands. */
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INT noiseBands, /*!< Number of noise bands per octave. */
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INT noiseFloorOffset, /*!< Noise floor offset. */
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INT timeSlots, /*!< Number of time slots in a frame. */
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UINT useSpeechConfig /*!< Flag: adapt tuning parameters according to speech
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*/
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);
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INT FDKsbrEnc_resetSbrNoiseFloorEstimate(
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HANDLE_SBR_NOISE_FLOOR_ESTIMATE
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h_sbrNoiseFloorEstimate, /*!< Handle to SBR_NOISE_FLOOR_ESTIMATE struct
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*/
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const UCHAR *freqBandTable, /*!< Frequany band table. */
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INT nSfb); /*!< Number of bands in the frequency band table. */
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void FDKsbrEnc_deleteSbrNoiseFloorEstimate(
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HANDLE_SBR_NOISE_FLOOR_ESTIMATE
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h_sbrNoiseFloorEstimate); /*!< Handle to SBR_NOISE_FLOOR_ESTIMATE struct
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*/
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#endif
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