mirror of https://github.com/mstorsjo/fdk-aac.git
175 lines
7.2 KiB
C
175 lines
7.2 KiB
C
/* -----------------------------------------------------------------------------
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Software License for The Fraunhofer FDK AAC Codec Library for Android
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© Copyright 1995 - 2018 Fraunhofer-Gesellschaft zur Förderung der angewandten
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Forschung e.V. All rights reserved.
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1. INTRODUCTION
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The Fraunhofer FDK AAC Codec Library for Android ("FDK AAC Codec") is software
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that implements the MPEG Advanced Audio Coding ("AAC") encoding and decoding
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scheme for digital audio. This FDK AAC Codec software is intended to be used on
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a wide variety of Android devices.
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AAC's HE-AAC and HE-AAC v2 versions are regarded as today's most efficient
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general perceptual audio codecs. AAC-ELD is considered the best-performing
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full-bandwidth communications codec by independent studies and is widely
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deployed. AAC has been standardized by ISO and IEC as part of the MPEG
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specifications.
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Patent licenses for necessary patent claims for the FDK AAC Codec (including
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those of Fraunhofer) may be obtained through Via Licensing
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(www.vialicensing.com) or through the respective patent owners individually for
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the purpose of encoding or decoding bit streams in products that are compliant
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with the ISO/IEC MPEG audio standards. Please note that most manufacturers of
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Android devices already license these patent claims through Via Licensing or
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directly from the patent owners, and therefore FDK AAC Codec software may
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already be covered under those patent licenses when it is used for those
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licensed purposes only.
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Commercially-licensed AAC software libraries, including floating-point versions
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with enhanced sound quality, are also available from Fraunhofer. Users are
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encouraged to check the Fraunhofer website for additional applications
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information and documentation.
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2. COPYRIGHT LICENSE
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Redistribution and use in source and binary forms, with or without modification,
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are permitted without payment of copyright license fees provided that you
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satisfy the following conditions:
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You must retain the complete text of this software license in redistributions of
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the FDK AAC Codec or your modifications thereto in source code form.
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You must retain the complete text of this software license in the documentation
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and/or other materials provided with redistributions of the FDK AAC Codec or
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your modifications thereto in binary form. You must make available free of
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charge copies of the complete source code of the FDK AAC Codec and your
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modifications thereto to recipients of copies in binary form.
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The name of Fraunhofer may not be used to endorse or promote products derived
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from this library without prior written permission.
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You may not charge copyright license fees for anyone to use, copy or distribute
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the FDK AAC Codec software or your modifications thereto.
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Your modified versions of the FDK AAC Codec must carry prominent notices stating
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that you changed the software and the date of any change. For modified versions
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of the FDK AAC Codec, the term "Fraunhofer FDK AAC Codec Library for Android"
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must be replaced by the term "Third-Party Modified Version of the Fraunhofer FDK
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AAC Codec Library for Android."
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3. NO PATENT LICENSE
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NO EXPRESS OR IMPLIED LICENSES TO ANY PATENT CLAIMS, including without
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limitation the patents of Fraunhofer, ARE GRANTED BY THIS SOFTWARE LICENSE.
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Fraunhofer provides no warranty of patent non-infringement with respect to this
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software.
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You may use this FDK AAC Codec software or modifications thereto only for
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purposes that are authorized by appropriate patent licenses.
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4. DISCLAIMER
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This FDK AAC Codec software is provided by Fraunhofer on behalf of the copyright
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holders and contributors "AS IS" and WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES,
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including but not limited to the implied warranties of merchantability and
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fitness for a particular purpose. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
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CONTRIBUTORS BE LIABLE for any direct, indirect, incidental, special, exemplary,
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or consequential damages, including but not limited to procurement of substitute
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goods or services; loss of use, data, or profits, or business interruption,
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however caused and on any theory of liability, whether in contract, strict
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liability, or tort (including negligence), arising in any way out of the use of
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this software, even if advised of the possibility of such damage.
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5. CONTACT INFORMATION
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Fraunhofer Institute for Integrated Circuits IIS
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Attention: Audio and Multimedia Departments - FDK AAC LL
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Am Wolfsmantel 33
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91058 Erlangen, Germany
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www.iis.fraunhofer.de/amm
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amm-info@iis.fraunhofer.de
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----------------------------------------------------------------------------- */
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/******************* Library for basic calculation routines ********************
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Author(s):
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Description: bitreversal of input data
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*******************************************************************************/
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#if !defined(SCRAMBLE_ARM_H)
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#define SCRAMBLE_ARM_H
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#if defined(FUNCTION_scramble)
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#if defined(__GNUC__)
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#define FUNCTION_scramble
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#if defined(__ARM_ARCH_5TE__)
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#define USE_LDRD_STRD /* LDRD requires 8 byte data alignment. */
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#endif
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inline void scramble(FIXP_DBL x[], INT n) {
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FDK_ASSERT(!(((INT)x) & (ALIGNMENT_DEFAULT - 1)));
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asm("mov r2, #1;\n" /* r2(m) = 1; */
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"sub r3, %1, #1;\n" /* r3 = n-1; */
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"mov r4, #0;\n" /* r4(j) = 0; */
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"scramble_m_loop%=:\n" /* { */
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"mov r5, %1;\n" /* r5(k) = 1; */
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"scramble_k_loop%=:\n" /* { */
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"mov r5, r5, lsr #1;\n" /* k >>= 1; */
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"eor r4, r4, r5;\n" /* j ^=k; */
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"ands r10, r4, r5;\n" /* r10 = r4 & r5; */
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"beq scramble_k_loop%=;\n" /* } while (r10 == 0); */
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"cmp r4, r2;\n" /* if (r4 < r2) break; */
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"bcc scramble_m_loop_end%=;\n"
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#ifdef USE_LDRD_STRD
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"mov r5, r2, lsl #3;\n" /* m(r5) = r2*4*2 */
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"ldrd r10, [%0, r5];\n" /* r10 = x[r5], x7 = x[r5+1] */
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"mov r6, r4, lsl #3;\n" /* j(r6) = r4*4*2 */
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"ldrd r8, [%0, r6];\n" /* r8 = x[r6], r9 = x[r6+1]; */
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"strd r10, [%0, r6];\n" /* x[r6,r6+1] = r10,r11; */
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"strd r8, [%0, r5];\n" /* x[r5,r5+1] = r8,r9; */
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#else
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"mov r5, r2, lsl #3;\n" /* m(r5) = r2*4*2 */
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"ldr r10, [%0, r5];\n"
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"mov r6, r4, lsl #3;\n" /* j(r6) = r4*4*2 */
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"ldr r11, [%0, r6];\n"
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"str r10, [%0, r6];\n"
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"str r11, [%0, r5];\n"
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"add r5, r5, #4;"
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"ldr r10, [%0, r5];\n"
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"add r6, r6, #4;"
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"ldr r11, [%0, r6];\n"
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"str r10, [%0, r6];\n"
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"str r11, [%0, r5];\n"
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#endif
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"scramble_m_loop_end%=:\n"
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"add r2, r2, #1;\n" /* r2++; */
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"cmp r2, r3;\n"
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"bcc scramble_m_loop%=;\n" /* } while (r2(m) < r3(n-1)); */
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:
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: "r"(x), "r"(n)
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#ifdef USE_LDRD_STRD
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: "r2", "r3", "r4", "r5", "r10", "r11", "r8", "r9", "r6");
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#else
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: "r2", "r3", "r4", "r5", "r10", "r11", "r6");
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#endif
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}
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#else
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/* Force C implementation if no assembler version available. */
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#undef FUNCTION_scramble
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#endif /* Toolchain selection. */
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#endif /* defined(FUNCTION_scramble) */
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#endif /* !defined(SCRAMBLE_ARM_H) */
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