1/* ----------------------------------------------------------------------------- 2Software License for The Fraunhofer FDK AAC Codec Library for Android 3 4© Copyright 1995 - 2018 Fraunhofer-Gesellschaft zur Förderung der angewandten 5Forschung e.V. All rights reserved. 6 7 1. INTRODUCTION 8The Fraunhofer FDK AAC Codec Library for Android ("FDK AAC Codec") is software 9that implements the MPEG Advanced Audio Coding ("AAC") encoding and decoding 10scheme for digital audio. This FDK AAC Codec software is intended to be used on 11a wide variety of Android devices. 12 13AAC's HE-AAC and HE-AAC v2 versions are regarded as today's most efficient 14general perceptual audio codecs. AAC-ELD is considered the best-performing 15full-bandwidth communications codec by independent studies and is widely 16deployed. AAC has been standardized by ISO and IEC as part of the MPEG 17specifications. 18 19Patent licenses for necessary patent claims for the FDK AAC Codec (including 20those of Fraunhofer) may be obtained through Via Licensing 21(www.vialicensing.com) or through the respective patent owners individually for 22the purpose of encoding or decoding bit streams in products that are compliant 23with the ISO/IEC MPEG audio standards. Please note that most manufacturers of 24Android devices already license these patent claims through Via Licensing or 25directly from the patent owners, and therefore FDK AAC Codec software may 26already be covered under those patent licenses when it is used for those 27licensed purposes only. 28 29Commercially-licensed AAC software libraries, including floating-point versions 30with enhanced sound quality, are also available from Fraunhofer. Users are 31encouraged to check the Fraunhofer website for additional applications 32information and documentation. 33 342. COPYRIGHT LICENSE 35 36Redistribution and use in source and binary forms, with or without modification, 37are permitted without payment of copyright license fees provided that you 38satisfy the following conditions: 39 40You must retain the complete text of this software license in redistributions of 41the FDK AAC Codec or your modifications thereto in source code form. 42 43You must retain the complete text of this software license in the documentation 44and/or other materials provided with redistributions of the FDK AAC Codec or 45your modifications thereto in binary form. You must make available free of 46charge copies of the complete source code of the FDK AAC Codec and your 47modifications thereto to recipients of copies in binary form. 48 49The name of Fraunhofer may not be used to endorse or promote products derived 50from this library without prior written permission. 51 52You may not charge copyright license fees for anyone to use, copy or distribute 53the FDK AAC Codec software or your modifications thereto. 54 55Your modified versions of the FDK AAC Codec must carry prominent notices stating 56that you changed the software and the date of any change. For modified versions 57of the FDK AAC Codec, the term "Fraunhofer FDK AAC Codec Library for Android" 58must be replaced by the term "Third-Party Modified Version of the Fraunhofer FDK 59AAC Codec Library for Android." 60 613. NO PATENT LICENSE 62 63NO EXPRESS OR IMPLIED LICENSES TO ANY PATENT CLAIMS, including without 64limitation the patents of Fraunhofer, ARE GRANTED BY THIS SOFTWARE LICENSE. 65Fraunhofer provides no warranty of patent non-infringement with respect to this 66software. 67 68You may use this FDK AAC Codec software or modifications thereto only for 69purposes that are authorized by appropriate patent licenses. 70 714. DISCLAIMER 72 73This FDK AAC Codec software is provided by Fraunhofer on behalf of the copyright 74holders and contributors "AS IS" and WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES, 75including but not limited to the implied warranties of merchantability and 76fitness for a particular purpose. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR 77CONTRIBUTORS BE LIABLE for any direct, indirect, incidental, special, exemplary, 78or consequential damages, including but not limited to procurement of substitute 79goods or services; loss of use, data, or profits, or business interruption, 80however caused and on any theory of liability, whether in contract, strict 81liability, or tort (including negligence), arising in any way out of the use of 82this software, even if advised of the possibility of such damage. 83 845. CONTACT INFORMATION 85 86Fraunhofer Institute for Integrated Circuits IIS 87Attention: Audio and Multimedia Departments - FDK AAC LL 88Am Wolfsmantel 33 8991058 Erlangen, Germany 90 91www.iis.fraunhofer.de/amm 92amm-info@iis.fraunhofer.de 93----------------------------------------------------------------------------- */ 94 95/**************************** AAC decoder library ****************************** 96 97 Author(s): Matthias Hildenbrand 98 99 Description: USAC ACELP LTP filter 100 101*******************************************************************************/ 102 103#include "usacdec_ace_ltp.h" 104 105#include "genericStds.h" 106#include "common_fix.h" 107 108#define UP_SAMP 4 109#define L_INTERPOL2 16 110#define L_SUBFR 64 111 112#define A2 FL2FX_SGL(2 * 0.18f) 113#define B FL2FX_SGL(0.64f) 114 115static const LONG Pred_lt4_inter4_2[UP_SAMP][L_INTERPOL2] = { 116 {(LONG)0x0000FFFC, (LONG)0x0008FFFC, (LONG)0xFFEB004C, (LONG)0xFF50014A, 117 (LONG)0xFDD90351, (LONG)0xFB2A06CD, (LONG)0xF6920D46, (LONG)0xEBB42B35, 118 (LONG)0x6D9EEF39, (LONG)0x0618FE0F, (LONG)0xFFE00131, (LONG)0xFE5501C5, 119 (LONG)0xFE5E015D, (LONG)0xFEF700B6, (LONG)0xFF920037, (LONG)0xFFEC0003}, 120 {(LONG)0x0002FFF2, (LONG)0x0026FFBD, (LONG)0x005DFF98, (LONG)0x0055FFEF, 121 (LONG)0xFF89015F, (LONG)0xFD3A04E5, (LONG)0xF7D90DAA, (LONG)0xE67A50EE, 122 (LONG)0x50EEE67A, (LONG)0x0DAAF7D9, (LONG)0x04E5FD3A, (LONG)0x015FFF89, 123 (LONG)0xFFEF0055, (LONG)0xFF98005D, (LONG)0xFFBD0026, (LONG)0xFFF20002}, 124 {(LONG)0x0003FFEC, (LONG)0x0037FF92, (LONG)0x00B6FEF7, (LONG)0x015DFE5E, 125 (LONG)0x01C5FE55, (LONG)0x0131FFE0, (LONG)0xFE0F0618, (LONG)0xEF396D9E, 126 (LONG)0x2B35EBB4, (LONG)0x0D46F692, (LONG)0x06CDFB2A, (LONG)0x0351FDD9, 127 (LONG)0x014AFF50, (LONG)0x004CFFEB, (LONG)0xFFFC0008, (LONG)0xFFFC0000}, 128 {(LONG)0x0002FFF2, (LONG)0x002BFF9E, (LONG)0x00B9FECE, (LONG)0x01CFFD75, 129 (LONG)0x035EFBC1, (LONG)0x0521FA0C, (LONG)0x06AAF8C9, (LONG)0x07907852, 130 (LONG)0x0790F8C9, (LONG)0x06AAFA0C, (LONG)0x0521FBC1, (LONG)0x035EFD75, 131 (LONG)0x01CFFECE, (LONG)0x00B9FF9E, (LONG)0x002BFFF2, (LONG)0x00020000}}; 132 133void Pred_lt4(FIXP_DBL exc[], /* in/out: excitation buffer */ 134 int T0, /* input : integer pitch lag */ 135 int frac /* input : fraction of lag in range 0..3 */ 136) { 137 int j; 138 FIXP_DBL *x; 139 const LONG *interpol; 140 FIXP_DBL L_sumb, L_sumt; 141 142 x = &exc[-T0 - L_INTERPOL2 + 1]; 143 144 /* remap frac and x: 145 0 -> 3 x (unchanged) 146 1 -> 0 x-- 147 2 -> 1 x-- 148 3 -> 2 x-- 149 */ 150 151 if (--frac < 0) 152 frac += UP_SAMP; 153 else 154 x--; 155 156 j = L_SUBFR + 1; 157 do { 158 LONG filt; 159 FIXP_DBL x0, x1; 160 FIXP_DBL *xi = x++; 161 interpol = Pred_lt4_inter4_2[frac]; 162 int i = 3; 163 164 filt = *interpol++; 165 x0 = *xi++; 166 x1 = *xi++; 167 L_sumt = fMultDiv2(x0, (FIXP_SGL)((SHORT)(filt >> 16))); 168 L_sumb = fMultDiv2(x1, (FIXP_SGL)((SHORT)filt)); 169 do { 170 filt = *interpol++; 171 x0 = *xi++; 172 x1 = *xi++; 173 L_sumt = fMultAddDiv2(L_sumt, x0, (FIXP_SGL)((SHORT)(filt >> 16))); 174 L_sumb = fMultAddDiv2(L_sumb, x1, (FIXP_SGL)((SHORT)filt)); 175 176 filt = *interpol++; 177 x0 = *xi++; 178 x1 = *xi++; 179 L_sumt = fMultAddDiv2(L_sumt, x0, (FIXP_SGL)((SHORT)(filt >> 16))); 180 L_sumb = fMultAddDiv2(L_sumb, x1, (FIXP_SGL)((SHORT)filt)); 181 182 filt = *interpol++; 183 x0 = *xi++; 184 x1 = *xi++; 185 L_sumt = fMultAddDiv2(L_sumt, x0, (FIXP_SGL)((SHORT)(filt >> 16))); 186 L_sumb = fMultAddDiv2(L_sumb, x1, (FIXP_SGL)((SHORT)filt)); 187 188 filt = *interpol++; 189 x0 = *xi++; 190 x1 = *xi++; 191 L_sumt = fMultAddDiv2(L_sumt, x0, (FIXP_SGL)((SHORT)(filt >> 16))); 192 L_sumb = fMultAddDiv2(L_sumb, x1, (FIXP_SGL)((SHORT)filt)); 193 194 filt = *interpol++; 195 x0 = *xi++; 196 x1 = *xi++; 197 L_sumt = fMultAddDiv2(L_sumt, x0, (FIXP_SGL)((SHORT)(filt >> 16))); 198 L_sumb = fMultAddDiv2(L_sumb, x1, (FIXP_SGL)((SHORT)filt)); 199 } while (--i != 0); 200 201 L_sumb <<= 1; 202 L_sumb = fAddSaturate(L_sumt << 1, L_sumb); 203 *exc++ = L_sumb; 204 } while (--j != 0); 205 return; 206} 207 208void Pred_lt4_postfilter(FIXP_DBL exc[] /* in/out: excitation buffer */ 209) { 210 /* 211 exc[i] = A*exc[i-1] + B*exc[i] + A*exc[i+1] 212 exc[i+1] = A*exc[i] + B*exc[i+1] + A*exc[i+2] ; i = 0:2:62 213 */ 214 int i; 215 FIXP_DBL sum0, sum1, a_exc0, a_exc1; 216 a_exc0 = fMultDiv2(A2, exc[-1]); 217 a_exc1 = fMultDiv2(A2, exc[0]); 218 219 /* ARM926: 22 cycles/iteration */ 220 for (i = 0; i < L_SUBFR; i += 2) { 221 sum0 = a_exc0 + fMult(B, exc[i]); 222 sum1 = a_exc1 + fMult(B, exc[i + 1]); 223 a_exc0 = fMultDiv2(A2, exc[i + 1]); 224 a_exc1 = fMultDiv2(A2, exc[i + 2]); 225 exc[i] = sum0 + a_exc0; 226 exc[i + 1] = sum1 + a_exc1; 227 } 228 return; 229} 230