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diff --git a/libAACdec/src/usacdec_lpd.h b/libAACdec/src/usacdec_lpd.h new file mode 100644 index 0000000..3e7938d --- /dev/null +++ b/libAACdec/src/usacdec_lpd.h @@ -0,0 +1,198 @@ +/* ----------------------------------------------------------------------------- +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): Manuel Jander + + Description: USAC Linear Prediction Domain coding + +*******************************************************************************/ + +#ifndef USACDEC_LPD_H +#define USACDEC_LPD_H + +#include "channelinfo.h" + +#define OPTIMIZE_AVG_PERFORMANCE + +/** + * \brief read a lpd_channel_stream. + * \param hBs a bit stream handle, where the lpd_channel_stream is located. + * \param pAacDecoderChannelInfo the channel context structure for storing read + * data. + * \param flags bit stream syntax flags. + * \return AAC_DECODER_ERROR error code. + */ +AAC_DECODER_ERROR CLpdChannelStream_Read( + HANDLE_FDK_BITSTREAM hBs, CAacDecoderChannelInfo *pAacDecoderChannelInfo, + CAacDecoderStaticChannelInfo *pAacDecoderStaticChannelInfo, + const SamplingRateInfo *pSamplingRateInfo, UINT flags); + +/** + * \brief decode one lpd_channel_stream and render the audio output. + * \param pAacDecoderChannelInfo struct holding the channel information to be + * rendered. + * \param pAacDecoderStaticChannelInfo struct holding the persistent channel + * information to be rendered. + * \param pSamplingRateInfo holds the sampling rate information + * \param elFlags holds the internal decoder flags + */ +void CLpdChannelStream_Decode( + CAacDecoderChannelInfo *pAacDecoderChannelInfo, + CAacDecoderStaticChannelInfo *pAacDecoderStaticChannelInfo, UINT flags); + +/** + * \brief generate time domain output signal for LPD channel streams + * \param pAacDecoderStaticChannelInfo + * \param pAacDecoderChannelInfo + * \param pTimeData pointer to output buffer + * \param samplesPerFrame amount of output samples + * \param pSamplingRateInfo holds the sampling rate information + * \param pWorkBuffer1 pointer to work buffer for temporal data + */ +AAC_DECODER_ERROR CLpd_RenderTimeSignal( + CAacDecoderStaticChannelInfo *pAacDecoderStaticChannelInfo, + CAacDecoderChannelInfo *pAacDecoderChannelInfo, FIXP_PCM *pTimeData, + INT samplesPerFrame, SamplingRateInfo *pSamplingRateInfo, UINT frameOk, + UINT flags, UINT strmFlags); + +static inline INT CLpd_FAC_getLength(int fNotShortBlock, int fac_length_long) { + if (fNotShortBlock) { + return (fac_length_long); + } else { + return fac_length_long / 2; + } +} + +void filtLP(const FIXP_DBL *syn, FIXP_PCM *syn_out, FIXP_DBL *noise, + const FIXP_SGL *filt, INT stop, int len); + +/** + * \brief perform a low-frequency pitch enhancement on time domain signal + * \param[in] syn pointer to time domain input signal + * \param[in] synFB pointer to time domain input signal + * \param[in] upsampling factor + * \param[in] T_sf array with past decoded pitch period values for each subframe + * \param[in] non_zero_gain_flags indicates whether pitch gains of past + * subframes are zero or not, msb -> [1 BPF_DELAY subfr][7 SYN_DELAY subfr][16 + * new subfr] <- lsb + * \param[in] l_frame length of filtering, must be multiple of L_SUBFR + * \param[in] l_next length of allowed look ahead on syn[i], i < l_frame+l_next + * \param[out] synth_out pointer to time domain output signal + * \param[in,out] mem_bpf pointer to filter memory (L_FILT+L_SUBFR) + */ + +void bass_pf_1sf_delay(FIXP_DBL syn[], const INT T_sf[], FIXP_DBL *pit_gain, + const int frame_length, const INT l_frame, + const INT l_next, FIXP_PCM *synth_out, + FIXP_DBL mem_bpf[]); + +/** + * \brief random sign generator for FD and TCX noise filling + * \param[in,out] seed pointer to random seed + * \return if return value is zero use positive sign + * \Note: This code is also implemented as a copy in block.cpp, grep for + * "UsacRandomSign" + */ +FDK_INLINE +int UsacRandomSign(ULONG *seed) { + *seed = (ULONG)((UINT64)(*seed) * 69069 + 5); + + return (int)((*seed) & 0x10000); +} + +void CFdp_Reset(CAacDecoderStaticChannelInfo *pAacDecoderStaticChannelInfo); + +#endif /* USACDEC_LPD_H */ |