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Diffstat (limited to 'libFDK/include/arm/scramble_arm.h')
| -rw-r--r-- | libFDK/include/arm/scramble_arm.h | 174 |
1 files changed, 174 insertions, 0 deletions
diff --git a/libFDK/include/arm/scramble_arm.h b/libFDK/include/arm/scramble_arm.h new file mode 100644 index 0000000..a7cfe65 --- /dev/null +++ b/libFDK/include/arm/scramble_arm.h @@ -0,0 +1,174 @@ +/* ----------------------------------------------------------------------------- +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) */ |