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Diffstat (limited to 'libAACdec/src/arm/block_arm.cpp')
| -rw-r--r-- | libAACdec/src/arm/block_arm.cpp | 140 |
1 files changed, 140 insertions, 0 deletions
diff --git a/libAACdec/src/arm/block_arm.cpp b/libAACdec/src/arm/block_arm.cpp new file mode 100644 index 0000000..4c0fcdd --- /dev/null +++ b/libAACdec/src/arm/block_arm.cpp @@ -0,0 +1,140 @@ + +/* ----------------------------------------------------------------------------------------------------------- +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) Scaling of spectral data + +******************************************************************************/ + + +#define FUNCTION_CBlock_ScaleSpectralData_func1 + +/* Note: This loop is only separated for ARM in order to save cycles + by loop unrolling. The ARM core provides by default a 5-cycle + loop overhead per sample, that goes down to 1-cycle per sample + with an optimal 4x-loop construct (do - 4x - while). +*/ + +FDK_INLINE static void CBlock_ScaleSpectralData_func1( + FIXP_DBL *pSpectrum, + int max_band, + const SHORT * RESTRICT BandOffsets, + int SpecScale_window, + const SHORT * RESTRICT pSfbScale, + int window) +{ + int band_offset = 0; + for (int band=0; band < max_band; band++) + { + int runs = band_offset; + band_offset = BandOffsets[band+1]; + runs = band_offset - runs; /* is always a multiple of 4 */ + int scale = SpecScale_window-pSfbScale[window*16+band]; + if (scale) + { + do + { + FIXP_DBL tmp0, tmp1, tmp2, tmp3; + tmp0 = pSpectrum[0]; + tmp1 = pSpectrum[1]; + tmp2 = pSpectrum[2]; + tmp3 = pSpectrum[3]; + tmp0 >>= scale; + tmp1 >>= scale; + tmp2 >>= scale; + tmp3 >>= scale; + *pSpectrum++ = tmp0; + *pSpectrum++ = tmp1; + *pSpectrum++ = tmp2; + *pSpectrum++ = tmp3; + } while ((runs = runs-4) != 0); + } + else + { + pSpectrum+= runs; + } + } +} |