| |
| /* ----------------------------------------------------------------------------------------------------------- |
| Software License for The Fraunhofer FDK AAC Codec Library for Android |
| |
| © Copyright 1995 - 2013 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 */ |