| |
| /* ----------------------------------------------------------------------------------------------------------- |
| Software License for The Fraunhofer FDK AAC Codec Library for Android |
| |
| © Copyright 1995 - 2013 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 |
| ----------------------------------------------------------------------------------------------------------- */ |
| |
| /*************************** Fraunhofer IIS FDK Tools ********************** |
| |
| Author(s): |
| Description: bitreversal of input data |
| |
| ******************************************************************************/ |
| |
| #if defined(FUNCTION_scramble) |
| #if defined(__GNUC__) /* cppp replaced: elif */ |
| |
| #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) */ |