| /* ----------------------------------------------------------------------------- |
| Software License for The Fraunhofer FDK AAC Codec Library for Android |
| |
| © Copyright 1995 - 2018 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 |
| ----------------------------------------------------------------------------- */ |
| |
| /**************************** SBR decoder library ****************************** |
| |
| Author(s): |
| |
| Description: |
| |
| *******************************************************************************/ |
| |
| /*! |
| \file |
| \brief Sbr decoder |
| */ |
| #ifndef PSDEC_H |
| #define PSDEC_H |
| |
| #include "sbrdecoder.h" |
| #include "FDK_hybrid.h" |
| |
| #include "FDK_decorrelate.h" |
| |
| /* This PS decoder implements the baseline version. So it always uses the */ |
| /* hybrid filter structure for 20 stereo bands and does not implemet IPD/OPD */ |
| /* synthesis. The baseline version has to support the complete PS bitstream */ |
| /* syntax. But IPD/OPD data is ignored and set to 0. If 34 stereo band config */ |
| /* is used in the bitstream for IIS/ICC the decoded parameters are mapped to */ |
| /* 20 stereo bands. */ |
| |
| #include "FDK_bitstream.h" |
| |
| #define SCAL_HEADROOM (2) |
| |
| #define PS_EXTENSION_SIZE_BITS (4) |
| #define PS_EXTENSION_ESC_COUNT_BITS (8) |
| |
| #define NO_QMF_CHANNELS (64) |
| #define MAX_NUM_COL (32) |
| |
| #define NO_QMF_BANDS_HYBRID20 (3) |
| #define NO_SUB_QMF_CHANNELS (12) |
| #define HYBRID_FILTER_DELAY (6) |
| |
| #define MAX_NO_PS_ENV (4 + 1) /* +1 needed for VAR_BORDER */ |
| |
| #define NO_HI_RES_BINS (34) |
| #define NO_MID_RES_BINS (20) |
| #define NO_LOW_RES_BINS (10) |
| |
| #define NO_HI_RES_IID_BINS (NO_HI_RES_BINS) |
| #define NO_HI_RES_ICC_BINS (NO_HI_RES_BINS) |
| |
| #define NO_MID_RES_IID_BINS (NO_MID_RES_BINS) |
| #define NO_MID_RES_ICC_BINS (NO_MID_RES_BINS) |
| |
| #define NO_LOW_RES_IID_BINS (NO_LOW_RES_BINS) |
| #define NO_LOW_RES_ICC_BINS (NO_LOW_RES_BINS) |
| |
| #define SUBQMF_GROUPS (10) |
| #define QMF_GROUPS (12) |
| |
| //#define SUBQMF_GROUPS_HI_RES ( 32 ) |
| //#define QMF_GROUPS_HI_RES ( 18 ) |
| |
| #define NO_IID_GROUPS (SUBQMF_GROUPS + QMF_GROUPS) |
| //#define NO_IID_GROUPS_HI_RES ( SUBQMF_GROUPS_HI_RES + |
| // QMF_GROUPS_HI_RES ) |
| |
| #define NO_IID_STEPS (7) /* 1 .. + 7 */ |
| #define NO_IID_STEPS_FINE (15) /* 1 .. +15 */ |
| #define NO_ICC_STEPS (8) /* 0 .. + 7 */ |
| |
| #define NO_IID_LEVELS (2 * NO_IID_STEPS + 1) /* - 7 .. + 7 */ |
| #define NO_IID_LEVELS_FINE (2 * NO_IID_STEPS_FINE + 1) /* -15 .. +15 */ |
| #define NO_ICC_LEVELS (NO_ICC_STEPS) /* 0 .. + 7 */ |
| |
| #define FIXP_SQRT05 ((FIXP_DBL)0x5a827980) /* 1/SQRT2 */ |
| |
| struct PS_DEC_COEFFICIENTS { |
| FIXP_DBL H11r[NO_IID_GROUPS]; /*!< coefficients of the sub-subband groups */ |
| FIXP_DBL H12r[NO_IID_GROUPS]; /*!< coefficients of the sub-subband groups */ |
| FIXP_DBL H21r[NO_IID_GROUPS]; /*!< coefficients of the sub-subband groups */ |
| FIXP_DBL H22r[NO_IID_GROUPS]; /*!< coefficients of the sub-subband groups */ |
| |
| FIXP_DBL |
| DeltaH11r[NO_IID_GROUPS]; /*!< coefficients of the sub-subband groups */ |
| FIXP_DBL |
| DeltaH12r[NO_IID_GROUPS]; /*!< coefficients of the sub-subband groups */ |
| FIXP_DBL |
| DeltaH21r[NO_IID_GROUPS]; /*!< coefficients of the sub-subband groups */ |
| FIXP_DBL |
| DeltaH22r[NO_IID_GROUPS]; /*!< coefficients of the sub-subband groups */ |
| |
| SCHAR |
| aaIidIndexMapped[MAX_NO_PS_ENV] |
| [NO_HI_RES_IID_BINS]; /*!< The mapped IID index for all |
| envelopes and all IID bins */ |
| SCHAR |
| aaIccIndexMapped[MAX_NO_PS_ENV] |
| [NO_HI_RES_ICC_BINS]; /*!< The mapped ICC index for all |
| envelopes and all ICC bins */ |
| }; |
| |
| typedef enum { ppt_none = 0, ppt_mpeg = 1, ppt_drm = 2 } PS_PAYLOAD_TYPE; |
| |
| typedef struct { |
| UCHAR bPsHeaderValid; /*!< set if new header is available from bitstream */ |
| |
| UCHAR bEnableIid; /*!< One bit denoting the presence of IID parameters */ |
| UCHAR bEnableIcc; /*!< One bit denoting the presence of ICC parameters */ |
| UCHAR bEnableExt; /*!< The PS extension layer is enabled using the enable_ext |
| bit. If it is set to %1 the IPD and OPD parameters are |
| sent. If it is disabled, i.e. %0, the extension layer is |
| skipped. */ |
| |
| UCHAR |
| modeIid; /*!< The configuration of IID parameters (number of bands and |
| quantisation grid, iid_quant) is determined by iid_mode. */ |
| UCHAR modeIcc; /*!< The configuration of Inter-channel Coherence parameters |
| (number of bands and quantisation grid) is determined by |
| icc_mode. */ |
| |
| UCHAR freqResIid; /*!< 0=low, 1=mid or 2=high frequency resolution for iid */ |
| UCHAR freqResIcc; /*!< 0=low, 1=mid or 2=high frequency resolution for icc */ |
| |
| UCHAR bFineIidQ; /*!< Use fine Iid quantisation. */ |
| |
| UCHAR bFrameClass; /*!< The frame_class bit determines whether the parameter |
| positions of the current frame are uniformly spaced |
| accross the frame or they are defined using the |
| positions described by border_position. |
| */ |
| |
| UCHAR noEnv; /*!< The number of envelopes per frame */ |
| UCHAR aEnvStartStop[MAX_NO_PS_ENV + 1]; /*!< In case of variable parameter |
| spacing the parameter positions are |
| determined by border_position */ |
| |
| SCHAR abIidDtFlag[MAX_NO_PS_ENV]; /*!< Deltacoding time/freq flag for IID, 0 |
| => freq */ |
| SCHAR abIccDtFlag[MAX_NO_PS_ENV]; /*!< Deltacoding time/freq flag for ICC, 0 |
| => freq */ |
| |
| SCHAR |
| aaIidIndex[MAX_NO_PS_ENV] |
| [NO_HI_RES_IID_BINS]; /*!< The IID index for all envelopes and |
| all IID bins */ |
| SCHAR |
| aaIccIndex[MAX_NO_PS_ENV] |
| [NO_HI_RES_ICC_BINS]; /*!< The ICC index for all envelopes and |
| all ICC bins */ |
| |
| } MPEG_PS_BS_DATA; |
| |
| struct PS_DEC { |
| SCHAR noSubSamples; |
| SCHAR noChannels; |
| |
| SCHAR procFrameBased; /*!< Helper to detected switching from frame based to |
| slot based processing |
| */ |
| |
| PS_PAYLOAD_TYPE |
| bPsDataAvail[(1) + 1]; /*!< set if new data available from bitstream */ |
| UCHAR psDecodedPrv; /*!< set if PS has been processed in the last frame */ |
| |
| /* helpers for frame delay line */ |
| UCHAR bsLastSlot; /*!< Index of last read slot. */ |
| UCHAR bsReadSlot; /*!< Index of current read slot for additional delay. */ |
| UCHAR processSlot; /*!< Index of current slot for processing (need for add. |
| delay). */ |
| |
| union { /* Bitstream data */ |
| MPEG_PS_BS_DATA |
| mpeg; /*!< Struct containing all MPEG specific PS data from bitstream. |
| */ |
| } bsData[(1) + 1]; |
| |
| shouldBeUnion { /* Static data */ |
| struct { |
| SCHAR aIidPrevFrameIndex[NO_HI_RES_IID_BINS]; /*!< The IID index for |
| previous frame */ |
| SCHAR aIccPrevFrameIndex[NO_HI_RES_ICC_BINS]; /*!< The ICC index for |
| previous frame */ |
| UCHAR |
| bPrevFrameFineIidQ; /*!< The IID quantization of the previous frame */ |
| UCHAR prevFreqResIid; /*!< Frequency resolution for IID of the previous |
| frame */ |
| UCHAR prevFreqResIcc; /*!< Frequency resolution for ICC of the previous |
| frame */ |
| UCHAR lastUsb; /*!< uppermost WMF delay band of last frame */ |
| |
| FIXP_DBL pHybridAnaStatesLFdmx |
| [2 * 13 * NO_QMF_BANDS_HYBRID20]; /*!< Memory used in hybrid analysis |
| for filter states. */ |
| FDK_ANA_HYB_FILTER hybridAnalysis; |
| FDK_SYN_HYB_FILTER hybridSynthesis[2]; |
| |
| DECORR_DEC apDecor; /*!< Decorrelator instance. */ |
| FIXP_DBL decorrBufferCplx[(2 * ((825) + (373)))]; |
| |
| FIXP_DBL h11rPrev[NO_IID_GROUPS]; /*!< previous calculated h(xy) |
| coefficients */ |
| FIXP_DBL h12rPrev[NO_IID_GROUPS]; /*!< previous calculated h(xy) |
| coefficients */ |
| FIXP_DBL h21rPrev[NO_IID_GROUPS]; /*!< previous calculated h(xy) |
| coefficients */ |
| FIXP_DBL h22rPrev[NO_IID_GROUPS]; /*!< previous calculated h(xy) |
| coefficients */ |
| |
| PS_DEC_COEFFICIENTS |
| *pCoef; /*!< temporal coefficients are on reusable scratch memory */ |
| |
| } mpeg; |
| } |
| specificTo; |
| }; |
| |
| typedef struct PS_DEC *HANDLE_PS_DEC; |
| |
| int CreatePsDec(HANDLE_PS_DEC *h_PS_DEC, int aacSamplesPerFrame); |
| |
| int DeletePsDec(HANDLE_PS_DEC *h_PS_DEC); |
| |
| void PreparePsProcessing(HANDLE_PS_DEC h_ps_d, |
| const FIXP_DBL *const *const rIntBufferLeft, |
| const FIXP_DBL *const *const iIntBufferLeft, |
| const int scaleFactorLowBand); |
| |
| void initSlotBasedRotation(HANDLE_PS_DEC h_ps_d, int env, int usb); |
| |
| void ApplyPsSlot( |
| HANDLE_PS_DEC h_ps_d, /* parametric stereo decoder handle */ |
| FIXP_DBL **rIntBufferLeft, /* real values of left qmf timeslot */ |
| FIXP_DBL **iIntBufferLeft, /* imag values of left qmf timeslot */ |
| FIXP_DBL *rIntBufferRight, /* real values of right qmf timeslot */ |
| FIXP_DBL *iIntBufferRight, /* imag values of right qmf timeslot */ |
| const int scaleFactorLowBand_no_ov, const int scaleFactorLowBand, |
| const int scaleFactorHighBand, const int lsb, const int usb); |
| |
| #endif /* PSDEC_H */ |
