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+/* -----------------------------------------------------------------------------
+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: dit_fft MIPS assembler replacements.
+
+*******************************************************************************/
+
+#ifndef __FFT_RAD2_CPP__
+#error \
+    "Do not compile this file separately. It is included on demand from fft_rad2.cpp"
+#endif
+
+#if defined(MIPS_DSP_LIB)
+
+#include "dsplib_util.h"
+#include "dsplib_dsp.h"
+
+#define FUNCTION_dit_fft
+
+#ifdef FUNCTION_dit_fft
+
+#include "mips_fft_twiddles.cpp"
+
+void dit_fft(FIXP_DBL *x, const INT ldn, const FIXP_STP *trigdata,
+             const INT trigDataSize) {
+  int i;
+
+  int32c *din = (int32c *)x;
+  int32c *dout = (int32c *)x;
+
+  int32c scratch[1024];
+  int32c *twiddles;
+
+  switch (ldn) {
+    case 4:
+      twiddles = (int32c *)__twiddles_mips_fft32_16;
+      break;
+    case 5:
+      twiddles = (int32c *)__twiddles_mips_fft32_32;
+      break;
+    case 6:
+      twiddles = (int32c *)__twiddles_mips_fft32_64;
+      break;
+    case 7:
+      twiddles = (int32c *)__twiddles_mips_fft32_128;
+      break;
+    case 8:
+      twiddles = (int32c *)__twiddles_mips_fft32_256;
+      break;
+    case 9:
+      twiddles = (int32c *)__twiddles_mips_fft32_512;
+      break;
+    case 10:
+      twiddles = (int32c *)__twiddles_mips_fft32_1024;
+      break;
+    default:
+      FDK_ASSERT(0);
+      break;
+  }
+
+  mips_fft32(dout, din, twiddles, scratch, ldn);
+
+  for (i = 0; i < (1 << ldn); i++) {
+    x[2 * i] = dout[i].re << 1;
+    x[2 * i + 1] = dout[i].im << 1;
+  }
+}
+#endif
+
+#endif /* defined(MIPS_DSP_LIB) */