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Diffstat (limited to 'libAACdec/src/stereo.cpp')
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diff --git a/libAACdec/src/stereo.cpp b/libAACdec/src/stereo.cpp deleted file mode 100644 index 4f28244..0000000 --- a/libAACdec/src/stereo.cpp +++ /dev/null @@ -1,297 +0,0 @@ - -/* ----------------------------------------------------------------------------------------------------------- -Software License for The Fraunhofer FDK AAC Codec Library for Android - -© Copyright 1995 - 2013 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 ------------------------------------------------------------------------------------------------------------ */ - -/***************************** MPEG-4 AAC Decoder ************************** - - Author(s): Josef Hoepfl - Description: joint stereo processing - -******************************************************************************/ - -#include "stereo.h" - - -#include "aac_rom.h" -#include "FDK_bitstream.h" -#include "channelinfo.h" - -enum -{ - L = 0, - R = 1 -}; - - -int CJointStereo_Read( - HANDLE_FDK_BITSTREAM bs, - CJointStereoData *pJointStereoData, - const int windowGroups, - const int scaleFactorBandsTransmitted, - const UINT flags - ) -{ - int group,band; - - pJointStereoData->MsMaskPresent = (UCHAR) FDKreadBits(bs,2); - - FDKmemclear(pJointStereoData->MsUsed, scaleFactorBandsTransmitted*sizeof(UCHAR)); - - switch (pJointStereoData->MsMaskPresent) - { - case 0 : /* no M/S */ - /* all flags are already cleared */ - break ; - - case 1 : /* read ms_used */ - - for (group=0; group<windowGroups; group++) - { - for (band=0; band<scaleFactorBandsTransmitted; band++) - { - pJointStereoData->MsUsed[band] |= (FDKreadBits(bs,1) << group); - } - } - break ; - - case 2 : /* full spectrum M/S */ - - for (band=0; band<scaleFactorBandsTransmitted; band++) - { - pJointStereoData->MsUsed[band] = 255 ; /* set all flags to 1 */ - } - break ; - } - - return 0; -} - -void CJointStereo_ApplyMS( - CAacDecoderChannelInfo *pAacDecoderChannelInfo[2], - const SHORT *pScaleFactorBandOffsets, - const UCHAR *pWindowGroupLength, - const int windowGroups, - const int scaleFactorBandsTransmittedL, - const int scaleFactorBandsTransmittedR - ) -{ - CJointStereoData *pJointStereoData = &pAacDecoderChannelInfo[L]->pComData->jointStereoData; - int window, group, scaleFactorBandsTransmitted; - - FDK_ASSERT(scaleFactorBandsTransmittedL == scaleFactorBandsTransmittedR); - scaleFactorBandsTransmitted = scaleFactorBandsTransmittedL; - for (window = 0, group = 0; group < windowGroups; group++) - { - UCHAR groupMask = 1 << group; - - for (int groupwin=0; groupwin<pWindowGroupLength[group]; groupwin++, window++) - { - int band; - FIXP_DBL *leftSpectrum, *rightSpectrum; - SHORT *leftScale = &pAacDecoderChannelInfo[L]->pDynData->aSfbScale[window*16]; - SHORT *rightScale = &pAacDecoderChannelInfo[R]->pDynData->aSfbScale[window*16]; - - leftSpectrum = SPEC(pAacDecoderChannelInfo[L]->pSpectralCoefficient, window, pAacDecoderChannelInfo[L]->granuleLength); - rightSpectrum = SPEC(pAacDecoderChannelInfo[R]->pSpectralCoefficient, window, pAacDecoderChannelInfo[R]->granuleLength); - - for (band=0; band<scaleFactorBandsTransmitted; band++) - { - if (pJointStereoData->MsUsed[band] & groupMask) - { - int lScale=leftScale[band]; - int rScale=rightScale[band]; - int commonScale=lScale > rScale ? lScale:rScale; - - /* ISO/IEC 14496-3 Chapter 4.6.8.1.1 : - M/S joint channel coding can only be used if common_window is ‘1’. */ - FDK_ASSERT(GetWindowSequence(&pAacDecoderChannelInfo[L]->icsInfo) == GetWindowSequence(&pAacDecoderChannelInfo[R]->icsInfo)); - FDK_ASSERT(GetWindowShape(&pAacDecoderChannelInfo[L]->icsInfo) == GetWindowShape(&pAacDecoderChannelInfo[R]->icsInfo)); - - commonScale++; - leftScale[band]=commonScale; - rightScale[band]=commonScale; - - lScale = fMin(DFRACT_BITS-1, commonScale - lScale); - rScale = fMin(DFRACT_BITS-1, commonScale - rScale); - - FDK_ASSERT(lScale >= 0 && rScale >= 0); - - for (int index=pScaleFactorBandOffsets[band]; index<pScaleFactorBandOffsets[band+1]; index++) - { - FIXP_DBL leftCoefficient = leftSpectrum [index] ; - FIXP_DBL rightCoefficient = rightSpectrum [index] ; - - leftCoefficient >>= lScale ; - rightCoefficient >>= rScale ; - - leftSpectrum [index] = leftCoefficient + rightCoefficient ; - rightSpectrum [index] = leftCoefficient - rightCoefficient ; - } - } - } - } - } - - /* Reset MsUsed flags if no explicit signalling was transmitted. Necessary for intensity coding. - PNS correlation signalling was mapped before calling CJointStereo_ApplyMS(). */ - if (pJointStereoData->MsMaskPresent == 2) { - FDKmemclear(pJointStereoData->MsUsed, JointStereoMaximumBands * sizeof(UCHAR)); - } -} - -void CJointStereo_ApplyIS( - CAacDecoderChannelInfo *pAacDecoderChannelInfo[2], - const SHORT *pScaleFactorBandOffsets, - const UCHAR *pWindowGroupLength, - const int windowGroups, - const int scaleFactorBandsTransmitted, - const UINT CommonWindow - ) -{ - CJointStereoData *pJointStereoData = &pAacDecoderChannelInfo[L]->pComData->jointStereoData; - - for (int window=0,group=0; group<windowGroups; group++) - { - UCHAR *CodeBook; - SHORT *ScaleFactor; - UCHAR groupMask = 1 << group; - - CodeBook = &pAacDecoderChannelInfo[R]->pDynData->aCodeBook[group*16]; - ScaleFactor = &pAacDecoderChannelInfo[R]->pDynData->aScaleFactor[group*16]; - - for (int groupwin=0; groupwin<pWindowGroupLength[group]; groupwin++, window++) - { - FIXP_DBL *leftSpectrum, *rightSpectrum; - SHORT *leftScale = &pAacDecoderChannelInfo[L]->pDynData->aSfbScale[window*16]; - SHORT *rightScale = &pAacDecoderChannelInfo[R]->pDynData->aSfbScale[window*16]; - int band; - - leftSpectrum = SPEC(pAacDecoderChannelInfo[L]->pSpectralCoefficient, window, pAacDecoderChannelInfo[L]->granuleLength); - rightSpectrum = SPEC(pAacDecoderChannelInfo[R]->pSpectralCoefficient, window, pAacDecoderChannelInfo[R]->granuleLength); - - for (band=0; band<scaleFactorBandsTransmitted; band++) - { - if ((CodeBook [band] == INTENSITY_HCB) || - (CodeBook [band] == INTENSITY_HCB2)) - { - int bandScale = -(ScaleFactor [band] + 100) ; - - int msb = bandScale >> 2 ; - int lsb = bandScale & 0x03 ; - - /* exponent of MantissaTable[lsb][0] is 1, thus msb+1 below. */ - FIXP_DBL scale = MantissaTable[lsb][0]; - - /* ISO/IEC 14496-3 Chapter 4.6.8.2.3 : - The use of intensity stereo coding is signaled by the use of the pseudo codebooks - INTENSITY_HCB and INTENSITY_HCB2 (15 and 14) only in the right channel of a - channel_pair_element() having a common ics_info() (common_window == 1). */ - FDK_ASSERT(GetWindowSequence(&pAacDecoderChannelInfo[L]->icsInfo) == GetWindowSequence(&pAacDecoderChannelInfo[R]->icsInfo)); - FDK_ASSERT(GetWindowShape(&pAacDecoderChannelInfo[L]->icsInfo) == GetWindowShape(&pAacDecoderChannelInfo[R]->icsInfo)); - - rightScale[band] = leftScale[band]+msb+1; - - if (CommonWindow && (pJointStereoData->MsUsed[band] & groupMask)) - { - - if (CodeBook[band] == INTENSITY_HCB) /* _NOT_ in-phase */ - { - scale = -scale ; - } - } - else - { - if (CodeBook[band] == INTENSITY_HCB2) /* out-of-phase */ - { - scale = -scale ; - } - } - - for (int index=pScaleFactorBandOffsets[band]; index<pScaleFactorBandOffsets[band+1]; index++) - { - rightSpectrum[index] = fMult(leftSpectrum[index],scale); - } - } - } - } - } -} |