| |
| /* ----------------------------------------------------------------------------------------------------------- |
| 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 Defines structures for RVLC |
| \author Robert Weidner |
| */ |
| #ifndef RVLC_INFO_H |
| #define RVLC_INFO_H |
| |
| |
| |
| #define FWD 0 /* bitstream decoding direction forward (RVL coded part) */ |
| #define BWD 1 /* bitstream decoding direction backward (RVL coded part) */ |
| |
| #define MAX_RVL 7 /* positive RVLC escape */ |
| #define MIN_RVL -7 /* negative RVLC escape */ |
| #define MAX_ALLOWED_DPCM_INDEX 14 /* the maximum allowed index of a decoded dpcm value (offset 'TABLE_OFFSET' incl --> must be subtracted) */ |
| #define TABLE_OFFSET 7 /* dpcm offset of valid output values of rvl table decoding, the rvl table ouly returns positive values, therefore the offset */ |
| #define MAX_LEN_RVLC_CODE_WORD 9 /* max length of a RVL codeword in bits */ |
| #define MAX_LEN_RVLC_ESCAPE_WORD 20 /* max length of huffman coded RVLC escape word in bits */ |
| |
| #define DPCM_NOISE_NRG_BITS 9 |
| #define SF_OFFSET 100 /* offset for correcting scf value */ |
| |
| #define CONCEAL_MAX_INIT 1311 /* arbitrary value */ |
| #define CONCEAL_MIN_INIT -1311 /* arbitrary value */ |
| |
| #define RVLC_MAX_SFB ((8) * (16)) |
| |
| /* sideinfo of RVLC */ |
| typedef struct |
| { |
| /* ------- ESC 1 Data: --------- */ /* order of RVLC-bitstream components in bitstream (RVLC-initialization), every component appears only once in bitstream */ |
| INT sf_concealment; /* 1 */ |
| INT rev_global_gain; /* 2 */ |
| SHORT length_of_rvlc_sf; /* 3 */ /* original value, gets modified (subtract 9) in case of noise (PNS); is kept for later use */ |
| INT dpcm_noise_nrg; /* 4 optional */ |
| INT sf_escapes_present; /* 5 */ |
| SHORT length_of_rvlc_escapes; /* 6 optional */ |
| INT dpcm_noise_last_position; /* 7 optional */ |
| |
| INT dpcm_is_last_position; |
| |
| SHORT length_of_rvlc_sf_fwd; /* length_of_rvlc_sf used for forward decoding */ |
| SHORT length_of_rvlc_sf_bwd; /* length_of_rvlc_sf used for backward decoding */ |
| |
| /* for RVL-Codeword decoder to distinguish between fwd and bwd decoding */ |
| SHORT *pRvlBitCnt_RVL; |
| USHORT *pBitstrIndxRvl_RVL; |
| |
| UCHAR numWindowGroups; |
| UCHAR maxSfbTransmitted; |
| UCHAR first_noise_group; |
| UCHAR first_noise_band; |
| UCHAR direction; |
| |
| /* bitstream indices */ |
| USHORT bitstreamIndexRvlFwd; /* base address of RVL-coded-scalefactor data (ESC 2) for forward decoding */ |
| USHORT bitstreamIndexRvlBwd; /* base address of RVL-coded-scalefactor data (ESC 2) for backward decoding */ |
| USHORT bitstreamIndexEsc; /* base address where RVLC-escapes start (ESC 2) */ |
| |
| /* decoding trees */ |
| const UINT *pHuffTreeRvlCodewds; |
| const UINT *pHuffTreeRvlcEscape; |
| |
| /* escape counters */ |
| UCHAR numDecodedEscapeWordsFwd; /* when decoding RVL-codes forward */ |
| UCHAR numDecodedEscapeWordsBwd; /* when decoding RVL-codes backward */ |
| UCHAR numDecodedEscapeWordsEsc; /* when decoding the escape-Words */ |
| |
| SCHAR noise_used; |
| SCHAR intensity_used; |
| SCHAR sf_used; |
| |
| SHORT firstScf; |
| SHORT lastScf; |
| SHORT firstNrg; |
| SHORT lastNrg; |
| SHORT firstIs; |
| SHORT lastIs; |
| |
| /* ------ RVLC error detection ------ */ |
| UINT errorLogRvlc; /* store RVLC errors */ |
| SHORT conceal_min; /* is set at backward decoding */ |
| SHORT conceal_max; /* is set at forward decoding */ |
| SHORT conceal_min_esc; /* is set at backward decoding */ |
| SHORT conceal_max_esc; /* is set at forward decoding */ |
| } CErRvlcInfo; |
| |
| typedef CErRvlcInfo RVLC_INFO; /* temp */ |
| |
| |
| |
| #endif /* RVLC_INFO_H */ |
