mirror of https://github.com/mstorsjo/fdk-aac.git
Merge "Prevent signed integer overflow in complex path of calc_qmfBuffer()." into sc-dev
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TreeHugger Robot
Android (Google) Code Review
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/* -----------------------------------------------------------------------------
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Software License for The Fraunhofer FDK AAC Codec Library for Android
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© Copyright 1995 - 2018 Fraunhofer-Gesellschaft zur Förderung der angewandten
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Forschung e.V. All rights reserved.
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1. INTRODUCTION
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The Fraunhofer FDK AAC Codec Library for Android ("FDK AAC Codec") is software
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that implements the MPEG Advanced Audio Coding ("AAC") encoding and decoding
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scheme for digital audio. This FDK AAC Codec software is intended to be used on
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a wide variety of Android devices.
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AAC's HE-AAC and HE-AAC v2 versions are regarded as today's most efficient
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general perceptual audio codecs. AAC-ELD is considered the best-performing
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full-bandwidth communications codec by independent studies and is widely
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deployed. AAC has been standardized by ISO and IEC as part of the MPEG
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specifications.
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Patent licenses for necessary patent claims for the FDK AAC Codec (including
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those of Fraunhofer) may be obtained through Via Licensing
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(www.vialicensing.com) or through the respective patent owners individually for
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the purpose of encoding or decoding bit streams in products that are compliant
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with the ISO/IEC MPEG audio standards. Please note that most manufacturers of
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Android devices already license these patent claims through Via Licensing or
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directly from the patent owners, and therefore FDK AAC Codec software may
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already be covered under those patent licenses when it is used for those
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licensed purposes only.
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Commercially-licensed AAC software libraries, including floating-point versions
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with enhanced sound quality, are also available from Fraunhofer. Users are
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encouraged to check the Fraunhofer website for additional applications
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information and documentation.
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2. COPYRIGHT LICENSE
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Redistribution and use in source and binary forms, with or without modification,
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are permitted without payment of copyright license fees provided that you
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satisfy the following conditions:
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You must retain the complete text of this software license in redistributions of
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the FDK AAC Codec or your modifications thereto in source code form.
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You must retain the complete text of this software license in the documentation
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and/or other materials provided with redistributions of the FDK AAC Codec or
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your modifications thereto in binary form. You must make available free of
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charge copies of the complete source code of the FDK AAC Codec and your
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modifications thereto to recipients of copies in binary form.
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The name of Fraunhofer may not be used to endorse or promote products derived
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from this library without prior written permission.
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You may not charge copyright license fees for anyone to use, copy or distribute
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the FDK AAC Codec software or your modifications thereto.
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Your modified versions of the FDK AAC Codec must carry prominent notices stating
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that you changed the software and the date of any change. For modified versions
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of the FDK AAC Codec, the term "Fraunhofer FDK AAC Codec Library for Android"
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must be replaced by the term "Third-Party Modified Version of the Fraunhofer FDK
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AAC Codec Library for Android."
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3. NO PATENT LICENSE
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NO EXPRESS OR IMPLIED LICENSES TO ANY PATENT CLAIMS, including without
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limitation the patents of Fraunhofer, ARE GRANTED BY THIS SOFTWARE LICENSE.
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Fraunhofer provides no warranty of patent non-infringement with respect to this
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software.
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You may use this FDK AAC Codec software or modifications thereto only for
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purposes that are authorized by appropriate patent licenses.
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4. DISCLAIMER
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This FDK AAC Codec software is provided by Fraunhofer on behalf of the copyright
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holders and contributors "AS IS" and WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES,
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including but not limited to the implied warranties of merchantability and
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fitness for a particular purpose. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
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CONTRIBUTORS BE LIABLE for any direct, indirect, incidental, special, exemplary,
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or consequential damages, including but not limited to procurement of substitute
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goods or services; loss of use, data, or profits, or business interruption,
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however caused and on any theory of liability, whether in contract, strict
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liability, or tort (including negligence), arising in any way out of the use of
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this software, even if advised of the possibility of such damage.
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5. CONTACT INFORMATION
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Fraunhofer Institute for Integrated Circuits IIS
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Attention: Audio and Multimedia Departments - FDK AAC LL
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Am Wolfsmantel 33
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91058 Erlangen, Germany
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www.iis.fraunhofer.de/amm
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amm-info@iis.fraunhofer.de
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----------------------------------------------------------------------------- */
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/**************************** SBR decoder library ******************************
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Author(s): Arthur Tritthart
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Description: (ARM optimised) LPP transposer subroutines
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*******************************************************************************/
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#if defined(__arm__)
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#define FUNCTION_LPPTRANSPOSER_func1
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#ifdef FUNCTION_LPPTRANSPOSER_func1
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/* Note: This code requires only 43 cycles per iteration instead of 61 on
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* ARM926EJ-S */
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static void lppTransposer_func1(FIXP_DBL *lowBandReal, FIXP_DBL *lowBandImag,
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FIXP_DBL **qmfBufferReal,
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FIXP_DBL **qmfBufferImag, int loops, int hiBand,
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int dynamicScale, int descale, FIXP_SGL a0r,
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FIXP_SGL a0i, FIXP_SGL a1r, FIXP_SGL a1i,
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const int fPreWhitening,
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FIXP_DBL preWhiteningGain,
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int preWhiteningGains_sf) {
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FIXP_DBL real1, real2, imag1, imag2, accu1, accu2;
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real2 = lowBandReal[-2];
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real1 = lowBandReal[-1];
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imag2 = lowBandImag[-2];
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imag1 = lowBandImag[-1];
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for (int i = 0; i < loops; i++) {
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accu1 = fMultDiv2(a0r, real1);
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accu2 = fMultDiv2(a0i, imag1);
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accu1 = fMultAddDiv2(accu1, a1r, real2);
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accu2 = fMultAddDiv2(accu2, a1i, imag2);
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real2 = fMultDiv2(a1i, real2);
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accu1 = accu1 - accu2;
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accu1 = accu1 >> dynamicScale;
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accu2 = fMultAddDiv2(real2, a1r, imag2);
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real2 = real1;
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imag2 = imag1;
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accu2 = fMultAddDiv2(accu2, a0i, real1);
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real1 = lowBandReal[i];
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accu2 = fMultAddDiv2(accu2, a0r, imag1);
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imag1 = lowBandImag[i];
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accu2 = accu2 >> dynamicScale;
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accu1 <<= 1;
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accu2 <<= 1;
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accu1 += (real1 >> descale);
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accu2 += (imag1 >> descale);
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if (fPreWhitening) {
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accu1 = scaleValueSaturate(fMultDiv2(accu1, preWhiteningGain),
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preWhiteningGains_sf);
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accu2 = scaleValueSaturate(fMultDiv2(accu2, preWhiteningGain),
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preWhiteningGains_sf);
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}
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qmfBufferReal[i][hiBand] = accu1;
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qmfBufferImag[i][hiBand] = accu2;
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}
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}
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#endif /* #ifdef FUNCTION_LPPTRANSPOSER_func1 */
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#endif /* __arm__ */
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@ -132,10 +132,6 @@ amm-info@iis.fraunhofer.de
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#include "HFgen_preFlat.h"
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#if defined(__arm__)
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#include "arm/lpp_tran_arm.cpp"
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#endif
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#define LPC_SCALE_FACTOR 2
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/*!
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@ -771,45 +767,45 @@ void lppTransposer(
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} else { /* bw <= 0 */
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if (!useLP) {
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int descale =
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fixMin(DFRACT_BITS - 1, (LPC_SCALE_FACTOR + dynamicScale));
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#ifdef FUNCTION_LPPTRANSPOSER_func1
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lppTransposer_func1(
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lowBandReal + LPC_ORDER + startSample,
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lowBandImag + LPC_ORDER + startSample,
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qmfBufferReal + startSample, qmfBufferImag + startSample,
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stopSample - startSample, (int)hiBand, dynamicScale, descale, a0r,
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a0i, a1r, a1i, fPreWhitening, preWhiteningGains[loBand],
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preWhiteningGains_exp[loBand] + 1);
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#else
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const int dynscale = fixMax(0, dynamicScale - 2) + 1;
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const int rescale = -fixMin(0, dynamicScale - 2) + 1;
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const int descale = fixMin(DFRACT_BITS - 1,
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LPC_SCALE_FACTOR + dynamicScale + rescale);
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for (i = startSample; i < stopSample; i++) {
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FIXP_DBL accu1, accu2;
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accu1 = (fMultDiv2(a0r, lowBandReal[LPC_ORDER + i - 1]) -
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fMultDiv2(a0i, lowBandImag[LPC_ORDER + i - 1]) +
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fMultDiv2(a1r, lowBandReal[LPC_ORDER + i - 2]) -
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fMultDiv2(a1i, lowBandImag[LPC_ORDER + i - 2])) >>
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dynamicScale;
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accu2 = (fMultDiv2(a0i, lowBandReal[LPC_ORDER + i - 1]) +
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fMultDiv2(a0r, lowBandImag[LPC_ORDER + i - 1]) +
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fMultDiv2(a1i, lowBandReal[LPC_ORDER + i - 2]) +
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fMultDiv2(a1r, lowBandImag[LPC_ORDER + i - 2])) >>
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dynamicScale;
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accu1 = ((fMultDiv2(a0r, lowBandReal[LPC_ORDER + i - 1]) -
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fMultDiv2(a0i, lowBandImag[LPC_ORDER + i - 1])) >>
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1) +
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((fMultDiv2(a1r, lowBandReal[LPC_ORDER + i - 2]) -
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fMultDiv2(a1i, lowBandImag[LPC_ORDER + i - 2])) >>
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1);
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accu2 = ((fMultDiv2(a0i, lowBandReal[LPC_ORDER + i - 1]) +
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fMultDiv2(a0r, lowBandImag[LPC_ORDER + i - 1])) >>
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1) +
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((fMultDiv2(a1i, lowBandReal[LPC_ORDER + i - 2]) +
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fMultDiv2(a1r, lowBandImag[LPC_ORDER + i - 2])) >>
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1);
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accu1 = (lowBandReal[LPC_ORDER + i] >> descale) + (accu1 << 1);
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accu2 = (lowBandImag[LPC_ORDER + i] >> descale) + (accu2 << 1);
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accu1 =
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(lowBandReal[LPC_ORDER + i] >> descale) + (accu1 >> dynscale);
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accu2 =
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(lowBandImag[LPC_ORDER + i] >> descale) + (accu2 >> dynscale);
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if (fPreWhitening) {
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accu1 = scaleValueSaturate(
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qmfBufferReal[i][hiBand] = scaleValueSaturate(
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fMultDiv2(accu1, preWhiteningGains[loBand]),
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preWhiteningGains_exp[loBand] + 1);
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accu2 = scaleValueSaturate(
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preWhiteningGains_exp[loBand] + 1 + rescale);
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qmfBufferImag[i][hiBand] = scaleValueSaturate(
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fMultDiv2(accu2, preWhiteningGains[loBand]),
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preWhiteningGains_exp[loBand] + 1);
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preWhiteningGains_exp[loBand] + 1 + rescale);
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} else {
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qmfBufferReal[i][hiBand] =
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SATURATE_LEFT_SHIFT(accu1, rescale, DFRACT_BITS);
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qmfBufferImag[i][hiBand] =
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SATURATE_LEFT_SHIFT(accu2, rescale, DFRACT_BITS);
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}
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qmfBufferReal[i][hiBand] = accu1;
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qmfBufferImag[i][hiBand] = accu2;
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}
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#endif
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} else {
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FDK_ASSERT(dynamicScale >= 0);
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calc_qmfBufferReal(
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