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Diffstat (limited to 'libAACdec/src/block.cpp')
| -rw-r--r-- | libAACdec/src/block.cpp | 118 |
1 files changed, 90 insertions, 28 deletions
diff --git a/libAACdec/src/block.cpp b/libAACdec/src/block.cpp index d17e9c4..1f82780 100644 --- a/libAACdec/src/block.cpp +++ b/libAACdec/src/block.cpp @@ -1,29 +1,91 @@ -/***************************** MPEG-4 AAC Decoder ************************** - (C) Copyright Fraunhofer IIS (2004) - All Rights Reserved +/* ----------------------------------------------------------------------------------------------------------- +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." - Please be advised that this software and/or program delivery is - Confidential Information of Fraunhofer and subject to and covered by the +3. NO PATENT LICENSE - Fraunhofer IIS Software Evaluation Agreement - between Google Inc. and Fraunhofer - effective and in full force since March 1, 2012. +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 software and/or program only under the terms and - conditions described in the above mentioned Fraunhofer IIS Software - Evaluation Agreement. Any other and/or further use requires a separate agreement. +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 +----------------------------------------------------------------------------------------------------------- */ + +/***************************** MPEG-4 AAC Decoder ************************** - $Id$ Author(s): Josef Hoepfl Description: long/short-block decoding - This software and/or program is protected by copyright law and international - treaties. Any reproduction or distribution of this software and/or program, - or any portion of it, may result in severe civil and criminal penalties, and - will be prosecuted to the maximum extent possible under law. - ******************************************************************************/ #include "block.h" @@ -214,7 +276,7 @@ AAC_DECODER_ERROR CBlock_ReadSectionData(HANDLE_FDK_BITSTREAM bs, { int top, band; int sect_len, sect_len_incr; - int group; + int group; UCHAR sect_cb; UCHAR *pCodeBook = pAacDecoderChannelInfo->pDynData->aCodeBook; /* HCR input (long) */ @@ -312,7 +374,7 @@ AAC_DECODER_ERROR CBlock_ReadSectionData(HANDLE_FDK_BITSTREAM bs, /* mso: provides a faster way to i-quantize a whole band in one go */ /** - * \brief inverse quantize one sfb. Each value of the sfb is processed according to the + * \brief inverse quantize one sfb. Each value of the sfb is processed according to the * formula: spectrum[i] = Sign(spectrum[i]) * Matissa(spectrum[i])^(4/3) * 2^(lsb/4). * \param spectrum pointer to first line of the sfb to be inverse quantized. * \param noLines number of lines belonging to the sfb. @@ -380,7 +442,7 @@ AAC_DECODER_ERROR CBlock_InverseQuantizeSpectralData(CAacDecoderChannelInfo *pAa for (band=0; band < ScaleFactorBandsTransmitted; band++) { FIXP_DBL *pSpectralCoefficient = SPEC(pAacDecoderChannelInfo->pSpectralCoefficient, window, pAacDecoderChannelInfo->granuleLength) + BandOffsets[band]; - + int noLines = BandOffsets[band+1] - BandOffsets[band]; int bnds = group*16+band; int i; @@ -417,7 +479,7 @@ AAC_DECODER_ERROR CBlock_InverseQuantizeSpectralData(CAacDecoderChannelInfo *pAa pSpectralCoefficient[i] = Sign(pSpectralCoefficient[i]) * 2^(0.25*pScaleFactor[bnds]) * pSpectralCoefficient[i]^(4/3) This is equivalent to: pSpectralCoefficient[i] = Sign(pSpectralCoefficient[i]) * (2^(pScaleFactor[bnds] % 4) * pSpectralCoefficient[i]^(4/3)) - pSpectralCoefficient_e[i] += pScaleFactor[bnds]/4 + pSpectralCoefficient_e[i] += pScaleFactor[bnds]/4 */ { int msb = pScaleFactor [bnds] >> 2 ; @@ -468,10 +530,10 @@ AAC_DECODER_ERROR CBlock_ReadSpectralData(HANDLE_FDK_BITSTREAM bs, int bnds = group*16+band; UCHAR currentCB = pCodeBook[bnds]; - /* patch to run plain-huffman-decoder with vcb11 input codebooks (LAV-checking might be possible below using the virtual cb and a LAV-table) */ + /* patch to run plain-huffman-decoder with vcb11 input codebooks (LAV-checking might be possible below using the virtual cb and a LAV-table) */ if ((currentCB >= 16) && (currentCB <= 31)) { pCodeBook[bnds] = currentCB = 11; - } + } if ( !((currentCB == ZERO_HCB) || (currentCB == NOISE_HCB) || (currentCB == INTENSITY_HCB) @@ -543,18 +605,18 @@ AAC_DECODER_ERROR CBlock_ReadSpectralData(HANDLE_FDK_BITSTREAM bs, #else return AAC_DEC_DECODE_FRAME_ERROR; #endif - } + } /* HCR decoding short */ hcrStatus = HcrDecoder(hHcr, pAacDecoderChannelInfo, pSamplingRateInfo, bs); - + #if HCR_ERROR_CONCEALMENT HcrMuteErroneousLines(hHcr); #else return AAC_DEC_DECODE_FRAME_ERROR; #endif /* HCR_ERROR_CONCEALMENT */ - + FDKpushFor (bs, pAacDecoderChannelInfo->pDynData->specificTo.aac.lenOfReorderedSpectralData); } } @@ -628,8 +690,8 @@ void CBlock_FrequencyToTime(CAacDecoderStaticChannelInfo *pAacDecoderStaticChann int fr, fl, tl, nSamples, nSpec; /* Determine left slope length (fl), right slope length (fr) and transform length (tl). - USAC: The slope length may mismatch with the previous frame in case of LPD / FD - transitions. The adjustment is handled by the imdct implementation. + USAC: The slope length may mismatch with the previous frame in case of LPD / FD + transitions. The adjustment is handled by the imdct implementation. */ tl = frameLen; nSpec = 1; |