| /* ----------------------------------------------------------------------------- |
| 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 |
| ----------------------------------------------------------------------------- */ |
| |
| /******************* Library for basic calculation routines ******************** |
| |
| Author(s): |
| |
| Description: bitreversal of input data |
| |
| *******************************************************************************/ |
| |
| #if !defined(SCRAMBLE_ARM_H) |
| #define SCRAMBLE_ARM_H |
| |
| #if defined(FUNCTION_scramble) |
| #if defined(__GNUC__) |
| |
| #define FUNCTION_scramble |
| |
| #if defined(__ARM_ARCH_5TE__) |
| #define USE_LDRD_STRD /* LDRD requires 8 byte data alignment. */ |
| #endif |
| |
| inline void scramble(FIXP_DBL x[], INT n) { |
| FDK_ASSERT(!(((INT)x) & (ALIGNMENT_DEFAULT - 1))); |
| asm("mov r2, #1;\n" /* r2(m) = 1; */ |
| "sub r3, %1, #1;\n" /* r3 = n-1; */ |
| "mov r4, #0;\n" /* r4(j) = 0; */ |
| |
| "scramble_m_loop%=:\n" /* { */ |
| "mov r5, %1;\n" /* r5(k) = 1; */ |
| |
| "scramble_k_loop%=:\n" /* { */ |
| "mov r5, r5, lsr #1;\n" /* k >>= 1; */ |
| "eor r4, r4, r5;\n" /* j ^=k; */ |
| "ands r10, r4, r5;\n" /* r10 = r4 & r5; */ |
| "beq scramble_k_loop%=;\n" /* } while (r10 == 0); */ |
| |
| "cmp r4, r2;\n" /* if (r4 < r2) break; */ |
| "bcc scramble_m_loop_end%=;\n" |
| |
| #ifdef USE_LDRD_STRD |
| "mov r5, r2, lsl #3;\n" /* m(r5) = r2*4*2 */ |
| "ldrd r10, [%0, r5];\n" /* r10 = x[r5], x7 = x[r5+1] */ |
| "mov r6, r4, lsl #3;\n" /* j(r6) = r4*4*2 */ |
| "ldrd r8, [%0, r6];\n" /* r8 = x[r6], r9 = x[r6+1]; */ |
| "strd r10, [%0, r6];\n" /* x[r6,r6+1] = r10,r11; */ |
| "strd r8, [%0, r5];\n" /* x[r5,r5+1] = r8,r9; */ |
| #else |
| "mov r5, r2, lsl #3;\n" /* m(r5) = r2*4*2 */ |
| "ldr r10, [%0, r5];\n" |
| "mov r6, r4, lsl #3;\n" /* j(r6) = r4*4*2 */ |
| "ldr r11, [%0, r6];\n" |
| |
| "str r10, [%0, r6];\n" |
| "str r11, [%0, r5];\n" |
| |
| "add r5, r5, #4;" |
| "ldr r10, [%0, r5];\n" |
| "add r6, r6, #4;" |
| "ldr r11, [%0, r6];\n" |
| "str r10, [%0, r6];\n" |
| "str r11, [%0, r5];\n" |
| #endif |
| "scramble_m_loop_end%=:\n" |
| "add r2, r2, #1;\n" /* r2++; */ |
| "cmp r2, r3;\n" |
| "bcc scramble_m_loop%=;\n" /* } while (r2(m) < r3(n-1)); */ |
| : |
| : "r"(x), "r"(n) |
| #ifdef USE_LDRD_STRD |
| : "r2", "r3", "r4", "r5", "r10", "r11", "r8", "r9", "r6"); |
| #else |
| : "r2", "r3", "r4", "r5", "r10", "r11", "r6"); |
| #endif |
| } |
| #else |
| /* Force C implementation if no assembler version available. */ |
| #undef FUNCTION_scramble |
| #endif /* Toolchain selection. */ |
| |
| #endif /* defined(FUNCTION_scramble) */ |
| #endif /* !defined(SCRAMBLE_ARM_H) */ |