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+
+/* -----------------------------------------------------------------------------------------------------------
+Software License for The Fraunhofer FDK AAC Codec Library for Android
+
+© Copyright  1995 - 2012 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) */