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Diffstat (limited to 'libAACdec/src/usacdec_acelp.h')
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diff --git a/libAACdec/src/usacdec_acelp.h b/libAACdec/src/usacdec_acelp.h new file mode 100644 index 0000000..593a073 --- /dev/null +++ b/libAACdec/src/usacdec_acelp.h @@ -0,0 +1,280 @@ +/* ----------------------------------------------------------------------------- +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 + + Description: USAC ACELP frame decoder + +*******************************************************************************/ + +#ifndef USACDEC_ACELP_H +#define USACDEC_ACELP_H + +#include "common_fix.h" +#include "FDK_bitstream.h" +#include "usacdec_const.h" +#include "usacdec_rom.h" + +//#define ENHANCED_TCX_TD_CONCEAL_ENABLE + +/** Structure which holds the ACELP internal persistent memory */ +typedef struct { + FIXP_DBL old_exc_mem[PIT_MAX_MAX + L_INTERPOL]; + FIXP_DBL old_syn_mem[M_LP_FILTER_ORDER]; /* synthesis filter states */ + FIXP_SGL A[M_LP_FILTER_ORDER]; + INT A_exp; + FIXP_DBL gc_threshold; + FIXP_DBL de_emph_mem; + FIXP_SGL past_gpit; + FIXP_DBL past_gcode; + USHORT old_T0; + UCHAR old_T0_frac; + FIXP_DBL deemph_mem_wsyn; + FIXP_DBL wsyn_rms; + SHORT seed_ace; +} CAcelpStaticMem; + +/** Structure which holds the parameter data needed to decode one ACELP frame. + */ +typedef struct { + UCHAR + acelp_core_mode; /**< mean excitation energy index for whole ACELP frame + */ + UCHAR mean_energy; /**< acelp core mode for whole ACELP frame */ + USHORT T0[NB_SUBFR]; + UCHAR T0_frac[NB_SUBFR]; + UCHAR ltp_filtering_flag[NB_SUBFR]; /**< controlls whether LTP postfilter is + active for each ACELP subframe */ + SHORT icb_index[NB_SUBFR] + [8]; /**< innovative codebook index for each ACELP subframe */ + UCHAR gains[NB_SUBFR]; /**< gain index for each ACELP subframe */ +} CAcelpChannelData; + +/** + * \brief Read the acelp_coding() bitstream part. + * \param[in] hBs bitstream handle to read data from. + * \param[out] acelpData pointer to structure to store the parsed data of one + * ACELP frame. + * \param[in] acelp_core_mode the ACELP core mode index. + * \param[in] coreCoderFrameLength length of core coder frame (1024|768) + */ +INT CLpd_AcelpRead(HANDLE_FDK_BITSTREAM hBs, CAcelpChannelData *acelpData, + INT acelp_core_mode, INT i_offset, INT coreCoderFrameLength); +/** + * \brief Initialization of memory before one LPD frame is decoded + * \param[out] synth_buf synthesis buffer to be initialized, exponent = SF_SYNTH + * \param[in] old_synth past synthesis of previous LPD frame, exponent = + * SF_SYNTH + * \param[out] synth_buf_fb fullband synthesis buffer to be initialized, + * exponent = SF_SYNTH + * \param[in] old_synth_fb past fullband synthesis of previous LPD frame, + * exponent = SF_SYNTH + * \param[out] pitch vector where decoded pitch lag values are stored + * \param[in] old_T_pf past pitch lag values of previous LPD frame + * \param[in] samplingRate sampling rate for pitch lag offset calculation + * \param[out] i_offset pitch lag offset for the decoding of the pitch lag + * \param[in] coreCoderFrameLength length of core coder frame (1024|768) + */ +void Acelp_PreProcessing(FIXP_DBL *synth_buf, FIXP_DBL *old_synth, INT *pitch, + INT *old_T_pf, FIXP_DBL *pit_gain, + FIXP_DBL *old_gain_pf, INT samplingRate, INT *i_offset, + INT coreCoderFrameLength, INT synSfd, + INT nbSubfrSuperfr); + +/** + * \brief Save tail of buffers for the initialization of the next LPD frame + * \param[in] synth_buf synthesis of current LPD frame, exponent = SF_SYNTH + * \param[out] old_synth memory where tail of fullband synth_buf is stored, + * exponent = SF_SYNTH + * \param[in] synth_buf_fb fullband synthesis of current LPD frame, exponent = + * SF_SYNTH + * \param[out] old_synth_fb memory where tail of fullband synth_buf is stored, + * exponent = SF_SYNTH + * \param[in] pitch decoded pitch lag values of current LPD frame + * \param[out] old_T_pf memory where last SYN_SFD pitch lag values are stored + */ +void Acelp_PostProcessing(FIXP_DBL *synth_buf, FIXP_DBL *old_synth, INT *pitch, + INT *old_T_pf, INT coreCoderFrameLength, INT synSfd, + INT nbSubfrSuperfr); + +/** + * \brief Decode one ACELP frame (three or four ACELP subframes with 64 samples + * each) + * \param[in,out] acelp_mem pointer to ACELP memory structure + * \param[in] i_offset pitch lag offset + * \param[in] lsp_old LPC filter in LSP domain corresponding to previous frame + * \param[in] lsp_new LPC filter in LSP domain corresponding to current frame + * \param[in] stab_fac stability factor constrained by 0<=stab_fac<=1.0, + * exponent = SF_STAB + * \param[in] acelpData pointer to struct with data which is needed for decoding + * one ACELP frame + * \param[out] synth ACELP output signal + * \param[out] pT four decoded pitch lag values + * \param[in] coreCoderFrameLength length of core coder frame (1024|768) + */ +void CLpd_AcelpDecode(CAcelpStaticMem *acelp_mem, INT i_offset, + const FIXP_LPC lsp_old[M_LP_FILTER_ORDER], + const FIXP_LPC lsp_new[M_LP_FILTER_ORDER], + FIXP_SGL stab_fac, CAcelpChannelData *acelpData, + INT numLostSubframes, int lastLpcLost, int frameCnt, + FIXP_DBL synth[], int pT[], FIXP_DBL *pit_gain, + INT coreCoderFrameLength); + +/** + * \brief Reset ACELP internal memory. + * \param[out] acelp_mem pointer to ACELP memory structure + */ +void CLpd_AcelpReset(CAcelpStaticMem *acelp_mem); + +/** + * \brief Initialize ACELP internal memory in case of FAC before ACELP decoder + * is called + * \param[in] synth points to end+1 of past valid synthesis signal, exponent = + * SF_SYNTH + * \param[in] last_lpd_mode last lpd mode + * \param[in] last_last_lpd_mode lpd mode before last_lpd_mode + * \param[in] A_new LP synthesis filter coeffs corresponding to last frame, + * exponent = SF_A_COEFFS + * \param[in] A_old LP synthesis filter coeffs corresponding to the frame before + * last frame, exponent = SF_A_COEFFS + * \param[in,out] acelp_mem pointer to ACELP memory structure + * \param[in] coreCoderFrameLength length of core coder frame (1024|768) + */ +void CLpd_AcelpPrepareInternalMem(const FIXP_DBL *synth, UCHAR last_lpd_mode, + UCHAR last_last_lpd_mode, + const FIXP_LPC *A_new, const INT A_new_exp, + const FIXP_LPC *A_old, const INT A_old_exp, + CAcelpStaticMem *acelp_mem, + INT coreCoderFrameLength, UCHAR lpd_mode); + +/** + * \brief Calculate zero input response (zir) of the acelp synthesis filter + * \param[in] A LP synthesis filter coefficients, exponent = SF_A_COEFFS + * \param[in,out] acelp_mem pointer to ACELP memory structure + * \param[in] length length of zir + * \param[out] zir pointer to zir output buffer, exponent = SF_SYNTH + */ +void CLpd_Acelp_Zir(const FIXP_LPC A[], const INT A_exp, + CAcelpStaticMem *acelp_mem, const INT length, + FIXP_DBL zir[], int doDeemph); + +/** + * \brief Borrow static excitation memory from ACELP decoder + * \param[in] acelp_mem pointer to ACELP memory structure + * \param[in] length number of requested FIXP_DBL values + * \return pointer to requested memory + * + * The caller has to take care not to overwrite valid memory areas. + * During TCX/FAC calculations and before CLpd_AcelpPrepareInternalMem() is + * called, the following memory size is available: + * - 256 samples in case of ACELP -> TCX20 -> ACELP transition + * - PIT_MAX_MAX+L_INTERPOL samples in all other cases + */ +FIXP_DBL *CLpd_ACELP_GetFreeExcMem(CAcelpStaticMem *acelp_mem, INT length); + +void CLpd_TcxTDConceal(CAcelpStaticMem *acelp_mem, SHORT *pitch, + const FIXP_LPC lsp_old[M_LP_FILTER_ORDER], + const FIXP_LPC lsp_new[M_LP_FILTER_ORDER], + const FIXP_SGL stab_fac, INT numLostSubframes, + FIXP_DBL synth[], INT coreCoderFrameLength, + UCHAR last_tcx_noise_factor); + +inline SHORT E_UTIL_random(SHORT *seed) { + *seed = (SHORT)((((LONG)*seed * (LONG)31821) >> 1) + (LONG)13849); + return (*seed); +} + +#endif /* USACDEC_ACELP_H */ |