| /* ----------------------------------------------------------------------------- |
| 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 LTP filter |
| |
| *******************************************************************************/ |
| |
| #include "usacdec_ace_ltp.h" |
| |
| #include "genericStds.h" |
| #include "common_fix.h" |
| |
| #define UP_SAMP 4 |
| #define L_INTERPOL2 16 |
| #define L_SUBFR 64 |
| |
| #define A2 FL2FX_SGL(2 * 0.18f) |
| #define B FL2FX_SGL(0.64f) |
| |
| static const LONG Pred_lt4_inter4_2[UP_SAMP][L_INTERPOL2] = { |
| {(LONG)0x0000FFFC, (LONG)0x0008FFFC, (LONG)0xFFEB004C, (LONG)0xFF50014A, |
| (LONG)0xFDD90351, (LONG)0xFB2A06CD, (LONG)0xF6920D46, (LONG)0xEBB42B35, |
| (LONG)0x6D9EEF39, (LONG)0x0618FE0F, (LONG)0xFFE00131, (LONG)0xFE5501C5, |
| (LONG)0xFE5E015D, (LONG)0xFEF700B6, (LONG)0xFF920037, (LONG)0xFFEC0003}, |
| {(LONG)0x0002FFF2, (LONG)0x0026FFBD, (LONG)0x005DFF98, (LONG)0x0055FFEF, |
| (LONG)0xFF89015F, (LONG)0xFD3A04E5, (LONG)0xF7D90DAA, (LONG)0xE67A50EE, |
| (LONG)0x50EEE67A, (LONG)0x0DAAF7D9, (LONG)0x04E5FD3A, (LONG)0x015FFF89, |
| (LONG)0xFFEF0055, (LONG)0xFF98005D, (LONG)0xFFBD0026, (LONG)0xFFF20002}, |
| {(LONG)0x0003FFEC, (LONG)0x0037FF92, (LONG)0x00B6FEF7, (LONG)0x015DFE5E, |
| (LONG)0x01C5FE55, (LONG)0x0131FFE0, (LONG)0xFE0F0618, (LONG)0xEF396D9E, |
| (LONG)0x2B35EBB4, (LONG)0x0D46F692, (LONG)0x06CDFB2A, (LONG)0x0351FDD9, |
| (LONG)0x014AFF50, (LONG)0x004CFFEB, (LONG)0xFFFC0008, (LONG)0xFFFC0000}, |
| {(LONG)0x0002FFF2, (LONG)0x002BFF9E, (LONG)0x00B9FECE, (LONG)0x01CFFD75, |
| (LONG)0x035EFBC1, (LONG)0x0521FA0C, (LONG)0x06AAF8C9, (LONG)0x07907852, |
| (LONG)0x0790F8C9, (LONG)0x06AAFA0C, (LONG)0x0521FBC1, (LONG)0x035EFD75, |
| (LONG)0x01CFFECE, (LONG)0x00B9FF9E, (LONG)0x002BFFF2, (LONG)0x00020000}}; |
| |
| void Pred_lt4(FIXP_DBL exc[], /* in/out: excitation buffer */ |
| int T0, /* input : integer pitch lag */ |
| int frac /* input : fraction of lag in range 0..3 */ |
| ) { |
| int j; |
| FIXP_DBL *x; |
| const LONG *interpol; |
| FIXP_DBL L_sumb, L_sumt; |
| |
| x = &exc[-T0 - L_INTERPOL2 + 1]; |
| |
| /* remap frac and x: |
| 0 -> 3 x (unchanged) |
| 1 -> 0 x-- |
| 2 -> 1 x-- |
| 3 -> 2 x-- |
| */ |
| |
| if (--frac < 0) |
| frac += UP_SAMP; |
| else |
| x--; |
| |
| j = L_SUBFR + 1; |
| do { |
| LONG filt; |
| FIXP_DBL x0, x1; |
| FIXP_DBL *xi = x++; |
| interpol = Pred_lt4_inter4_2[frac]; |
| int i = 3; |
| |
| filt = *interpol++; |
| x0 = *xi++; |
| x1 = *xi++; |
| L_sumt = fMultDiv2(x0, (FIXP_SGL)((SHORT)(filt >> 16))); |
| L_sumb = fMultDiv2(x1, (FIXP_SGL)((SHORT)filt)); |
| do { |
| filt = *interpol++; |
| x0 = *xi++; |
| x1 = *xi++; |
| L_sumt = fMultAddDiv2(L_sumt, x0, (FIXP_SGL)((SHORT)(filt >> 16))); |
| L_sumb = fMultAddDiv2(L_sumb, x1, (FIXP_SGL)((SHORT)filt)); |
| |
| filt = *interpol++; |
| x0 = *xi++; |
| x1 = *xi++; |
| L_sumt = fMultAddDiv2(L_sumt, x0, (FIXP_SGL)((SHORT)(filt >> 16))); |
| L_sumb = fMultAddDiv2(L_sumb, x1, (FIXP_SGL)((SHORT)filt)); |
| |
| filt = *interpol++; |
| x0 = *xi++; |
| x1 = *xi++; |
| L_sumt = fMultAddDiv2(L_sumt, x0, (FIXP_SGL)((SHORT)(filt >> 16))); |
| L_sumb = fMultAddDiv2(L_sumb, x1, (FIXP_SGL)((SHORT)filt)); |
| |
| filt = *interpol++; |
| x0 = *xi++; |
| x1 = *xi++; |
| L_sumt = fMultAddDiv2(L_sumt, x0, (FIXP_SGL)((SHORT)(filt >> 16))); |
| L_sumb = fMultAddDiv2(L_sumb, x1, (FIXP_SGL)((SHORT)filt)); |
| |
| filt = *interpol++; |
| x0 = *xi++; |
| x1 = *xi++; |
| L_sumt = fMultAddDiv2(L_sumt, x0, (FIXP_SGL)((SHORT)(filt >> 16))); |
| L_sumb = fMultAddDiv2(L_sumb, x1, (FIXP_SGL)((SHORT)filt)); |
| } while (--i != 0); |
| |
| L_sumb <<= 1; |
| L_sumb = fAddSaturate(L_sumt << 1, L_sumb); |
| *exc++ = L_sumb; |
| } while (--j != 0); |
| return; |
| } |
| |
| void Pred_lt4_postfilter(FIXP_DBL exc[] /* in/out: excitation buffer */ |
| ) { |
| /* |
| exc[i] = A*exc[i-1] + B*exc[i] + A*exc[i+1] |
| exc[i+1] = A*exc[i] + B*exc[i+1] + A*exc[i+2] ; i = 0:2:62 |
| */ |
| int i; |
| FIXP_DBL sum0, sum1, a_exc0, a_exc1; |
| a_exc0 = fMultDiv2(A2, exc[-1]); |
| a_exc1 = fMultDiv2(A2, exc[0]); |
| |
| /* ARM926: 22 cycles/iteration */ |
| for (i = 0; i < L_SUBFR; i += 2) { |
| sum0 = a_exc0 + fMult(B, exc[i]); |
| sum1 = a_exc1 + fMult(B, exc[i + 1]); |
| a_exc0 = fMultDiv2(A2, exc[i + 1]); |
| a_exc1 = fMultDiv2(A2, exc[i + 2]); |
| exc[i] = sum0 + a_exc0; |
| exc[i + 1] = sum1 + a_exc1; |
| } |
| return; |
| } |