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diff --git a/libAACdec/src/usacdec_lpc.h b/libAACdec/src/usacdec_lpc.h new file mode 100644 index 0000000..a6713c1 --- /dev/null +++ b/libAACdec/src/usacdec_lpc.h @@ -0,0 +1,190 @@ +/* ----------------------------------------------------------------------------- +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 */ |