| /* ----------------------------------------------------------------------------- |
| 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 |
| ----------------------------------------------------------------------------- */ |
| |
| /**************************** AAC decoder library ****************************** |
| |
| Author(s): Matthias Hildenbrand, Manuel Jander |
| |
| Description: USAC LPC/AVQ decode |
| |
| *******************************************************************************/ |
| |
| #ifndef USACDEC_LPC_H |
| #define USACDEC_LPC_H |
| |
| #include "channelinfo.h" |
| #include "common_fix.h" |
| #include "FDK_bitstream.h" |
| #include "usacdec_rom.h" |
| |
| #define LSPARG_SCALE 10 |
| |
| /** |
| * \brief AVQ (refinement) decode |
| * \param hBs bitstream handle |
| * \param lsfq buffer for AVQ decode output. |
| * \param nk_mode quantization mode. |
| * \param nqn amount of split/interleaved RE8 vectors. |
| * \param total amount of individual data values to decode. |
| * \return 0 on success, -1 on error. |
| */ |
| int CLpc_DecodeAVQ(HANDLE_FDK_BITSTREAM hBs, FIXP_DBL *lsfq, int nk_mode, |
| int nqn, int length); |
| |
| /** |
| * \brief Read and decode LPC coeficient sets. First stage approximation + AVQ |
| * decode. |
| * \param[in] hBs bitstream handle to read data from. |
| * \param[out] lsp buffer into which the decoded LSP coefficients will be stored |
| * into. |
| * \param[in,out] lpc4_lsf buffer into which the decoded LCP4 LSF coefficients |
| * will be stored into (persistent). |
| * \param[out] lsf_adaptive_mean_cand lsf adaptive mean vector needed for |
| * concealment. |
| * \param[out] pStability array with stability values for the ACELP decoder (and |
| * concealment). |
| * \param[in] mod array which defines modes (ACELP, TCX20|40|80) are used in |
| * the current superframe. |
| * \param[in] first_lpd_flag indicates the presence of LPC0 |
| * \param[in] last_lpc_lost indicate that LPC4 of previous frame was lost. |
| * \param[in] last_frame_ok indicate that the last frame was ok. |
| * \return 0 on success, -1 on error. |
| */ |
| int CLpc_Read(HANDLE_FDK_BITSTREAM hBs, FIXP_LPC lsp[][M_LP_FILTER_ORDER], |
| FIXP_LPC lpc4_lsf[M_LP_FILTER_ORDER], |
| FIXP_LPC lsf_adaptive_mean_cand[M_LP_FILTER_ORDER], |
| FIXP_SGL pStability[], UCHAR *mod, int first_lpd_flag, |
| int last_lpc_lost, int last_frame_ok); |
| |
| /** |
| * \brief Generate LPC coefficient sets in case frame loss. |
| * \param lsp buffer into which the decoded LSP coefficients will be stored |
| * into. |
| * \param lpc4_lsf buffer into which the decoded LCP4 LSF coefficients will be |
| * stored into (persistent). |
| * \param isf_adaptive_mean |
| * \param first_lpd_flag indicates the previous LSF4 coefficients lpc4_lsf[] are |
| * not valid. |
| */ |
| void CLpc_Conceal(FIXP_LPC lsp[][M_LP_FILTER_ORDER], |
| FIXP_LPC lpc4_lsf[M_LP_FILTER_ORDER], |
| FIXP_LPC isf_adaptive_mean[M_LP_FILTER_ORDER], |
| const int first_lpd_flag); |
| |
| /** |
| * \brief apply absolute weighting |
| * \param A weighted LPC coefficient vector output. The first coeffcient is |
| * implicitly 1.0 |
| * \param A LPC coefficient vector. The first coeffcient is implicitly 1.0 |
| * \param m length of vector A |
| */ |
| /* static */ |
| void E_LPC_a_weight(FIXP_LPC *wA, const FIXP_LPC *A, const int m); |
| |
| /** |
| * \brief decode TCX/FAC gain. In case of TCX the lg/sqrt(rms) part |
| * must still be applied to obtain the gain value. |
| * \param gain (o) pointer were the gain mantissa is stored into. |
| * \param gain_e (o) pointer were the gain exponent is stored into. |
| * \param gain_code (i) the 7 bit binary word from the bitstream |
| * representing the gain. |
| */ |
| void CLpd_DecodeGain(FIXP_DBL *gain, INT *gain_e, int gain_code); |
| |
| /** |
| * \brief convert LSP coefficients into LP domain. |
| */ |
| void E_LPC_f_lsp_a_conversion(FIXP_LPC *lsp, FIXP_LPC *a, INT *a_exp); |
| |
| #endif /* USACDEC_LPC_H */ |