From 2228e360595641dd906bf1773307f43d304f5b2e Mon Sep 17 00:00:00 2001 From: The Android Open Source Project Date: Wed, 11 Jul 2012 10:15:24 -0700 Subject: Snapshot 2bda038c163298531d47394bc2c09e1409c5d0db Change-Id: If584e579464f28b97d50e51fc76ba654a5536c54 --- libSBRdec/src/env_calc.h | 165 +++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 165 insertions(+) create mode 100644 libSBRdec/src/env_calc.h (limited to 'libSBRdec/src/env_calc.h') diff --git a/libSBRdec/src/env_calc.h b/libSBRdec/src/env_calc.h new file mode 100644 index 0000000..d21e0b3 --- /dev/null +++ b/libSBRdec/src/env_calc.h @@ -0,0 +1,165 @@ + +/* ----------------------------------------------------------------------------------------------------------- +Software License for The Fraunhofer FDK AAC Codec Library for Android + +© Copyright 1995 - 2012 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 +----------------------------------------------------------------------------------------------------------- */ + +/*! + \file + \brief Envelope calculation prototypes +*/ +#ifndef __ENV_CALC_H +#define __ENV_CALC_H + +#include "sbrdecoder.h" +#include "env_extr.h" /* for HANDLE_SBR_HEADER_DATA */ +#include "sbr_scale.h" + + +typedef struct +{ + FIXP_DBL filtBuffer[MAX_FREQ_COEFFS]; /*!< previous gains (required for smoothing) */ + FIXP_DBL filtBufferNoise[MAX_FREQ_COEFFS]; /*!< previous noise levels (required for smoothing) */ + SCHAR filtBuffer_e[MAX_FREQ_COEFFS]; /*!< Exponents of previous gains */ + SCHAR filtBufferNoise_e; /*!< Common exponent of previous noise levels */ + + int startUp; /*!< flag to signal initial conditions in buffers */ + int phaseIndex; /*!< Index for randomPase array */ + int prevTranEnv; /*!< The transient envelope of the previous frame. */ + + int harmFlagsPrev[(MAX_FREQ_COEFFS+15)/16]; + /*!< Words with 16 flags each indicating where a sine was added in the previous frame.*/ + UCHAR harmIndex; /*!< Current phase of synthetic sine */ + +} +SBR_CALCULATE_ENVELOPE; + +typedef SBR_CALCULATE_ENVELOPE *HANDLE_SBR_CALCULATE_ENVELOPE; + + + +void +calculateSbrEnvelope (QMF_SCALE_FACTOR *sbrScaleFactor, + HANDLE_SBR_CALCULATE_ENVELOPE h_sbr_cal_env, + HANDLE_SBR_HEADER_DATA hHeaderData, + HANDLE_SBR_FRAME_DATA hFrameData, + FIXP_DBL **analysBufferReal, + FIXP_DBL **analysBufferImag, /*!< Imag part of subband samples to be processed */ + const int useLP, + FIXP_DBL *degreeAlias, /*!< Estimated aliasing for each QMF channel */ + const UINT flags, + const int frameErrorFlag + ); + +SBR_ERROR +createSbrEnvelopeCalc (HANDLE_SBR_CALCULATE_ENVELOPE hSbrCalculateEnvelope, + HANDLE_SBR_HEADER_DATA hHeaderData, + const int chan, + const UINT flags); + +int +deleteSbrEnvelopeCalc (HANDLE_SBR_CALCULATE_ENVELOPE hSbrCalculateEnvelope); + +void +resetSbrEnvelopeCalc (HANDLE_SBR_CALCULATE_ENVELOPE hCalEnv); + +SBR_ERROR +ResetLimiterBands ( UCHAR *limiterBandTable, + UCHAR *noLimiterBands, + UCHAR *freqBandTable, + int noFreqBands, + const PATCH_PARAM *patchParam, + int noPatches, + int limiterBands); + +void rescaleSubbandSamples( FIXP_DBL ** re, + FIXP_DBL ** im, + int lowSubband, int noSubbands, + int start_pos, int next_pos, + int shift); + +FIXP_DBL maxSubbandSample( FIXP_DBL ** analysBufferReal_m, + FIXP_DBL ** analysBufferImag_m, + int lowSubband, + int highSubband, + int start_pos, + int stop_pos); + +#endif // __ENV_CALC_H -- cgit v1.2.3