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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: dit_fft ARM assembler replacements.
+
+******************************************************************************/
+
+/* NEON optimized FFT currently builds only with RVCT toolchain */
+
+#ifndef FUNCTION_dit_fft
+
+/* If dit_fft was not yet defined by ARM-Cortex ... */
+
+#if defined(SINETABLE_16BIT)
+
+#define FUNCTION_dit_fft
+
+/*****************************************************************************
+
+   date:   28.07.2005   srl
+
+   Contents/description: dit-tukey-FFT-algorithm
+
+******************************************************************************/
+
+#if defined(FUNCTION_dit_fft)
+
+
+void dit_fft(FIXP_DBL *x, const INT ldn, const FIXP_STP *trigdata, const INT trigDataSize)
+{
+    const INT n=1<<ldn;
+    INT i;
+
+    scramble(x,n);
+    /*
+     * 1+2 stage radix 4
+     */
+
+    for (i=0;i<n*2;i+=8)
+    {
+      FIXP_DBL a00, a10, a20, a30;
+      a00 = (x[i + 0] + x[i + 2])>>1;  /* Re A + Re B */
+      a10 = (x[i + 4] + x[i + 6])>>1;  /* Re C + Re D */
+      a20 = (x[i + 1] + x[i + 3])>>1;  /* Im A + Im B */
+      a30 = (x[i + 5] + x[i + 7])>>1;  /* Im C + Im D */
+
+      x[i + 0] = a00 + a10;       /* Re A' = Re A + Re B + Re C + Re D */
+      x[i + 4] = a00 - a10;       /* Re C' = Re A + Re B - Re C - Re D */
+      x[i + 1] = a20 + a30;       /* Im A' = Im A + Im B + Im C + Im D */
+      x[i + 5] = a20 - a30;       /* Im C' = Im A + Im B - Im C - Im D */
+
+      a00 = a00 - x[i + 2];       /* Re A - Re B */
+      a10 = a10 - x[i + 6];       /* Re C - Re D */
+      a20 = a20 - x[i + 3];       /* Im A - Im B */
+      a30 = a30 - x[i + 7];       /* Im C - Im D */
+
+      x[i + 2] = a00 + a30;       /* Re B' = Re A - Re B + Im C - Im D */
+      x[i + 6] = a00 - a30;       /* Re D' = Re A - Re B - Im C + Im D */
+      x[i + 3] = a20 - a10;       /* Im B' = Im A - Im B - Re C + Re D */
+      x[i + 7] = a20 + a10;       /* Im D' = Im A - Im B + Re C - Re D */
+    }
+
+    INT mh = 1 << 1;
+    INT ldm = ldn - 2;
+    INT trigstep = trigDataSize;
+
+    do
+    {
+        const FIXP_STP *pTrigData = trigdata;
+        INT j;
+
+        mh <<= 1;
+        trigstep >>= 1;
+
+        FDK_ASSERT(trigstep > 0);
+
+        /* Do first iteration with c=1.0 and s=0.0 separately to avoid loosing to much precision.
+           Beware: The impact on the overal FFT precision is rather large. */
+        {
+            FIXP_DBL *xt1 = x;
+            int r = n;
+
+            do {
+                FIXP_DBL *xt2 = xt1 + (mh<<1);
+                /*
+                FIXP_DBL *xt1 = x+ ((r)<<1);
+                FIXP_DBL *xt2 = xt1 + (mh<<1);
+                */
+                FIXP_DBL vr,vi,ur,ui;                 
+
+                //cplxMultDiv2(&vi, &vr, x[t2+1], x[t2], (FIXP_SGL)1.0, (FIXP_SGL)0.0);
+                vi = xt2[1]>>1;
+                vr = xt2[0]>>1;
+
+                ur = xt1[0]>>1;
+                ui = xt1[1]>>1;
+
+                xt1[0] = ur+vr;
+                xt1[1] = ui+vi;
+
+                xt2[0] = ur-vr;
+                xt2[1] = ui-vi;
+
+                xt1 += mh;
+                xt2 += mh;
+
+                //cplxMultDiv2(&vr, &vi, x[t2+1], x[t2], (FIXP_SGL)1.0, (FIXP_SGL)0.0);
+                vr = xt2[1]>>1;
+                vi = xt2[0]>>1;
+
+                ur = xt1[0]>>1;
+                ui = xt1[1]>>1;
+
+                xt1[0] = ur+vr;
+                xt1[1] = ui-vi;
+
+                xt2[0] = ur-vr;
+                xt2[1] = ui+vi;
+
+                xt1 = xt2 + mh;
+            } while ((r=r-(mh<<1)) != 0);
+        }
+        for(j=4; j<mh; j+=4)
+        {
+            FIXP_DBL *xt1 = x + (j>>1);
+            FIXP_SPK cs;
+            int r = n;
+
+            pTrigData += trigstep;
+            cs = *pTrigData;
+
+            do
+            {
+                FIXP_DBL *xt2 = xt1 + (mh<<1);
+                FIXP_DBL vr,vi,ur,ui;
+
+                cplxMultDiv2(&vi, &vr, xt2[1], xt2[0], cs);
+
+                ur = xt1[0]>>1;
+                ui = xt1[1]>>1;
+
+                xt1[0] = ur+vr;
+                xt1[1] = ui+vi;
+
+                xt2[0] = ur-vr;
+                xt2[1] = ui-vi;
+
+                xt1 += mh;
+                xt2 += mh;
+
+                cplxMultDiv2(&vr, &vi, xt2[1], xt2[0], cs);
+
+                ur = xt1[0]>>1;
+                ui = xt1[1]>>1;
+
+                xt1[0] = ur+vr;
+                xt1[1] = ui-vi;
+
+                xt2[0] = ur-vr;
+                xt2[1] = ui+vi;
+
+                /* Same as above but for t1,t2 with j>mh/4 and thus cs swapped */
+                xt1 = xt1 - (j);
+                xt2 = xt1 + (mh<<1);
+
+                cplxMultDiv2(&vi, &vr, xt2[0], xt2[1], cs);
+
+                ur = xt1[0]>>1;
+                ui = xt1[1]>>1;
+
+                xt1[0] = ur+vr;
+                xt1[1] = ui-vi;
+
+                xt2[0] = ur-vr;
+                xt2[1] = ui+vi;
+
+                xt1 += mh;
+                xt2 += mh;
+
+                cplxMultDiv2(&vr, &vi, xt2[0], xt2[1], cs);
+
+                ur = xt1[0]>>1;
+                ui = xt1[1]>>1;
+
+                xt1[0] = ur-vr;
+                xt1[1] = ui-vi;
+
+                xt2[0] = ur+vr;
+                xt2[1] = ui+vi;
+
+                xt1 = xt2 + (j);
+            }  while ((r=r-(mh<<1)) != 0);
+        }
+        {
+            FIXP_DBL *xt1 = x + (mh>>1);
+            int r = n;
+
+            do
+            {
+                FIXP_DBL *xt2 = xt1 + (mh<<1);
+                FIXP_DBL vr,vi,ur,ui;
+
+                cplxMultDiv2(&vi, &vr, xt2[1], xt2[0], STC(0x5a82799a), STC(0x5a82799a));
+
+                ur = xt1[0]>>1;
+                ui = xt1[1]>>1;
+
+                xt1[0] = ur+vr;
+                xt1[1] = ui+vi;
+
+                xt2[0] = ur-vr;
+                xt2[1] = ui-vi;
+
+                xt1 += mh;
+                xt2 += mh;
+
+                cplxMultDiv2(&vr, &vi, xt2[1], xt2[0], STC(0x5a82799a), STC(0x5a82799a));
+
+                ur = xt1[0]>>1;
+                ui = xt1[1]>>1;
+
+                xt1[0] = ur+vr;
+                xt1[1] = ui-vi;
+
+                xt2[0] = ur-vr;
+                xt2[1] = ui+vi;
+
+                xt1 = xt2 + mh;
+            }  while ((r=r-(mh<<1)) != 0);
+        }
+    } while (--ldm != 0);
+}
+
+#endif /* if defined(FUNCTION_dit_fft)  */
+
+#endif /* if defined(SINETABLE_16BIT) */
+
+#endif /* ifndef FUNCTION_dit_fft */