/* -----------------------------------------------------------------------------
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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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/**************************** AAC decoder library ******************************
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Author(s): Josef Hoepfl
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Description: individual channel stream info
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*******************************************************************************/
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#include "channelinfo.h"
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#include "aac_rom.h"
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#include "aac_ram.h"
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#include "FDK_bitstream.h"
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AAC_DECODER_ERROR IcsReadMaxSfb(HANDLE_FDK_BITSTREAM bs, CIcsInfo *pIcsInfo,
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const SamplingRateInfo *pSamplingRateInfo) {
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AAC_DECODER_ERROR ErrorStatus = AAC_DEC_OK;
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int nbits;
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if (IsLongBlock(pIcsInfo)) {
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nbits = 6;
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pIcsInfo->TotalSfBands = pSamplingRateInfo->NumberOfScaleFactorBands_Long;
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} else {
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nbits = 4;
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pIcsInfo->TotalSfBands = pSamplingRateInfo->NumberOfScaleFactorBands_Short;
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}
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pIcsInfo->MaxSfBands = (UCHAR)FDKreadBits(bs, nbits);
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if (pIcsInfo->MaxSfBands > pIcsInfo->TotalSfBands) {
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ErrorStatus = AAC_DEC_PARSE_ERROR;
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}
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return ErrorStatus;
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}
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AAC_DECODER_ERROR IcsRead(HANDLE_FDK_BITSTREAM bs, CIcsInfo *pIcsInfo,
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const SamplingRateInfo *pSamplingRateInfo,
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const UINT flags) {
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AAC_DECODER_ERROR ErrorStatus = AAC_DEC_OK;
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pIcsInfo->Valid = 0;
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if (flags & AC_ELD) {
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pIcsInfo->WindowSequence = BLOCK_LONG;
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pIcsInfo->WindowShape = 0;
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} else {
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if (!(flags & (AC_USAC | AC_RSVD50 | AC_RSV603DA))) {
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FDKreadBits(bs, 1);
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}
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pIcsInfo->WindowSequence = (BLOCK_TYPE)FDKreadBits(bs, 2);
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pIcsInfo->WindowShape = (UCHAR)FDKreadBits(bs, 1);
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if (flags & AC_LD) {
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if (pIcsInfo->WindowShape) {
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pIcsInfo->WindowShape = 2; /* select low overlap instead of KBD */
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}
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}
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}
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/* Sanity check */
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if ((flags & (AC_ELD | AC_LD)) && pIcsInfo->WindowSequence != BLOCK_LONG) {
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pIcsInfo->WindowSequence = BLOCK_LONG;
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ErrorStatus = AAC_DEC_PARSE_ERROR;
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goto bail;
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}
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ErrorStatus = IcsReadMaxSfb(bs, pIcsInfo, pSamplingRateInfo);
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if (ErrorStatus != AAC_DEC_OK) {
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goto bail;
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}
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if (IsLongBlock(pIcsInfo)) {
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if (!(flags & (AC_ELD | AC_SCALABLE | AC_BSAC | AC_USAC | AC_RSVD50 |
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AC_RSV603DA))) /* If not ELD nor Scalable nor BSAC nor USAC
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syntax then ... */
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{
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if ((UCHAR)FDKreadBits(bs, 1) != 0) /* UCHAR PredictorDataPresent */
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{
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ErrorStatus = AAC_DEC_UNSUPPORTED_PREDICTION;
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goto bail;
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}
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}
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pIcsInfo->WindowGroups = 1;
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pIcsInfo->WindowGroupLength[0] = 1;
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} else {
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INT i;
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UINT mask;
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pIcsInfo->ScaleFactorGrouping = (UCHAR)FDKreadBits(bs, 7);
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pIcsInfo->WindowGroups = 0;
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for (i = 0; i < (8 - 1); i++) {
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mask = 1 << (6 - i);
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pIcsInfo->WindowGroupLength[i] = 1;
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if (pIcsInfo->ScaleFactorGrouping & mask) {
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pIcsInfo->WindowGroupLength[pIcsInfo->WindowGroups]++;
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} else {
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pIcsInfo->WindowGroups++;
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}
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}
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/* loop runs to i < 7 only */
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pIcsInfo->WindowGroupLength[8 - 1] = 1;
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pIcsInfo->WindowGroups++;
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}
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bail:
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if (ErrorStatus == AAC_DEC_OK) pIcsInfo->Valid = 1;
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return ErrorStatus;
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}
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/*
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interleave codebooks the following way
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9 (84w) | 1 (51w)
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10 (82w) | 2 (39w)
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SCL (65w) | 4 (38w)
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3 (39w) | 5 (41w)
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| 6 (40w)
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| 7 (31w)
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| 8 (31w)
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(270w) (271w)
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*/
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/*
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Table entries are sorted as following:
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| num_swb_long_window | sfbands_long | num_swb_short_window | sfbands_short |
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*/
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AAC_DECODER_ERROR getSamplingRateInfo(SamplingRateInfo *t, UINT samplesPerFrame,
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UINT samplingRateIndex,
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UINT samplingRate) {
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int index = 0;
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/* Search closest samplerate according to ISO/IEC 13818-7:2005(E) 8.2.4 (Table
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* 38): */
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if ((samplingRateIndex >= 15) || (samplesPerFrame == 768)) {
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const UINT borders[] = {(UINT)-1, 92017, 75132, 55426, 46009, 37566,
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27713, 23004, 18783, 13856, 11502, 9391};
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UINT i, samplingRateSearch = samplingRate;
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if (samplesPerFrame == 768) {
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samplingRateSearch = (samplingRate * 4) / 3;
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}
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for (i = 0; i < 11; i++) {
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if (borders[i] > samplingRateSearch &&
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samplingRateSearch >= borders[i + 1]) {
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break;
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}
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}
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samplingRateIndex = i;
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}
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t->samplingRateIndex = samplingRateIndex;
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t->samplingRate = samplingRate;
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switch (samplesPerFrame) {
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case 1024:
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index = 0;
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break;
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case 960:
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index = 1;
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break;
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case 768:
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index = 2;
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break;
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case 512:
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index = 3;
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break;
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case 480:
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index = 4;
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break;
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default:
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return AAC_DEC_UNSUPPORTED_FORMAT;
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}
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t->ScaleFactorBands_Long =
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sfbOffsetTables[index][samplingRateIndex].sfbOffsetLong;
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t->ScaleFactorBands_Short =
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sfbOffsetTables[index][samplingRateIndex].sfbOffsetShort;
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t->NumberOfScaleFactorBands_Long =
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sfbOffsetTables[index][samplingRateIndex].numberOfSfbLong;
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t->NumberOfScaleFactorBands_Short =
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sfbOffsetTables[index][samplingRateIndex].numberOfSfbShort;
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if (t->ScaleFactorBands_Long == NULL ||
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t->NumberOfScaleFactorBands_Long == 0) {
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t->samplingRate = 0;
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return AAC_DEC_UNSUPPORTED_FORMAT;
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}
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FDK_ASSERT((UINT)t->ScaleFactorBands_Long[t->NumberOfScaleFactorBands_Long] ==
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samplesPerFrame);
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FDK_ASSERT(
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t->ScaleFactorBands_Short == NULL ||
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(UINT)t->ScaleFactorBands_Short[t->NumberOfScaleFactorBands_Short] * 8 ==
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samplesPerFrame);
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return AAC_DEC_OK;
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}
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