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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
+----------------------------------------------------------------------------- */
+
+/**************************** SBR decoder library ******************************
+
+ Author(s): Arthur Tritthart
+
+ Description: (ARM optimised) LPP transposer subroutines
+
+*******************************************************************************/
+
+#if defined(__arm__)
+
+#define FUNCTION_LPPTRANSPOSER_func1
+
+#ifdef FUNCTION_LPPTRANSPOSER_func1
+
+/* Note: This code requires only 43 cycles per iteration instead of 61 on
+ * ARM926EJ-S */
+static void lppTransposer_func1(FIXP_DBL *lowBandReal, FIXP_DBL *lowBandImag,
+ FIXP_DBL **qmfBufferReal,
+ FIXP_DBL **qmfBufferImag, int loops, int hiBand,
+ int dynamicScale, int descale, FIXP_SGL a0r,
+ FIXP_SGL a0i, FIXP_SGL a1r, FIXP_SGL a1i,
+ const int fPreWhitening,
+ FIXP_DBL preWhiteningGain,
+ int preWhiteningGains_sf) {
+ FIXP_DBL real1, real2, imag1, imag2, accu1, accu2;
+
+ real2 = lowBandReal[-2];
+ real1 = lowBandReal[-1];
+ imag2 = lowBandImag[-2];
+ imag1 = lowBandImag[-1];
+ for (int i = 0; i < loops; i++) {
+ accu1 = fMultDiv2(a0r, real1);
+ accu2 = fMultDiv2(a0i, imag1);
+ accu1 = fMultAddDiv2(accu1, a1r, real2);
+ accu2 = fMultAddDiv2(accu2, a1i, imag2);
+ real2 = fMultDiv2(a1i, real2);
+ accu1 = accu1 - accu2;
+ accu1 = accu1 >> dynamicScale;
+
+ accu2 = fMultAddDiv2(real2, a1r, imag2);
+ real2 = real1;
+ imag2 = imag1;
+ accu2 = fMultAddDiv2(accu2, a0i, real1);
+ real1 = lowBandReal[i];
+ accu2 = fMultAddDiv2(accu2, a0r, imag1);
+ imag1 = lowBandImag[i];
+ accu2 = accu2 >> dynamicScale;
+
+ accu1 <<= 1;
+ accu2 <<= 1;
+ accu1 += (real1 >> descale);
+ accu2 += (imag1 >> descale);
+ if (fPreWhitening) {
+ accu1 = scaleValueSaturate(fMultDiv2(accu1, preWhiteningGain),
+ preWhiteningGains_sf);
+ accu2 = scaleValueSaturate(fMultDiv2(accu2, preWhiteningGain),
+ preWhiteningGains_sf);
+ }
+ qmfBufferReal[i][hiBand] = accu1;
+ qmfBufferImag[i][hiBand] = accu2;
+ }
+}
+#endif /* #ifdef FUNCTION_LPPTRANSPOSER_func1 */
+
+#endif /* __arm__ */