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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 *************************** |
| |
| Author(s): Arthur Tritthart |
| Description: (ARM optimised) LPP transposer subroutines |
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| ******************************************************************************/ |
| |
| |
| #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 */ |
| __attribute__ ((noinline)) 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) |
| { |
| |
| 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; |
| |
| qmfBufferReal[i][hiBand] = accu1 + (real1>>descale); |
| qmfBufferImag[i][hiBand] = accu2 + (imag1>>descale); |
| } |
| } |
| #endif /* #ifdef FUNCTION_LPPTRANSPOSER_func1 */ |
| #endif /* __arm__ */ |
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