diff options
Diffstat (limited to 'fdk-aac/libAACdec/src/channelinfo.cpp')
| -rw-r--r-- | fdk-aac/libAACdec/src/channelinfo.cpp | 297 |
1 files changed, 297 insertions, 0 deletions
diff --git a/fdk-aac/libAACdec/src/channelinfo.cpp b/fdk-aac/libAACdec/src/channelinfo.cpp new file mode 100644 index 0000000..79add5b --- /dev/null +++ b/fdk-aac/libAACdec/src/channelinfo.cpp @@ -0,0 +1,297 @@ +/* ----------------------------------------------------------------------------- +Software License for The Fraunhofer FDK AAC Codec Library for Android + +© Copyright 1995 - 2018 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 +----------------------------------------------------------------------------- */ + +/**************************** AAC decoder library ****************************** + + Author(s): Josef Hoepfl + + Description: individual channel stream info + +*******************************************************************************/ + +#include "channelinfo.h" +#include "aac_rom.h" +#include "aac_ram.h" +#include "FDK_bitstream.h" + +AAC_DECODER_ERROR IcsReadMaxSfb(HANDLE_FDK_BITSTREAM bs, CIcsInfo *pIcsInfo, + const SamplingRateInfo *pSamplingRateInfo) { + AAC_DECODER_ERROR ErrorStatus = AAC_DEC_OK; + int nbits; + + if (IsLongBlock(pIcsInfo)) { + nbits = 6; + pIcsInfo->TotalSfBands = pSamplingRateInfo->NumberOfScaleFactorBands_Long; + } else { + nbits = 4; + pIcsInfo->TotalSfBands = pSamplingRateInfo->NumberOfScaleFactorBands_Short; + } + pIcsInfo->MaxSfBands = (UCHAR)FDKreadBits(bs, nbits); + + if (pIcsInfo->MaxSfBands > pIcsInfo->TotalSfBands) { + ErrorStatus = AAC_DEC_PARSE_ERROR; + } + + return ErrorStatus; +} + +AAC_DECODER_ERROR IcsRead(HANDLE_FDK_BITSTREAM bs, CIcsInfo *pIcsInfo, + const SamplingRateInfo *pSamplingRateInfo, + const UINT flags) { + AAC_DECODER_ERROR ErrorStatus = AAC_DEC_OK; + + pIcsInfo->Valid = 0; + + if (flags & AC_ELD) { + pIcsInfo->WindowSequence = BLOCK_LONG; + pIcsInfo->WindowShape = 0; + } else { + if (!(flags & (AC_USAC | AC_RSVD50 | AC_RSV603DA))) { + FDKreadBits(bs, 1); + } + pIcsInfo->WindowSequence = (BLOCK_TYPE)FDKreadBits(bs, 2); + pIcsInfo->WindowShape = (UCHAR)FDKreadBits(bs, 1); + if (flags & AC_LD) { + if (pIcsInfo->WindowShape) { + pIcsInfo->WindowShape = 2; /* select low overlap instead of KBD */ + } + } + } + + /* Sanity check */ + if ((flags & (AC_ELD | AC_LD)) && pIcsInfo->WindowSequence != BLOCK_LONG) { + pIcsInfo->WindowSequence = BLOCK_LONG; + ErrorStatus = AAC_DEC_PARSE_ERROR; + goto bail; + } + + ErrorStatus = IcsReadMaxSfb(bs, pIcsInfo, pSamplingRateInfo); + if (ErrorStatus != AAC_DEC_OK) { + goto bail; + } + + if (IsLongBlock(pIcsInfo)) { + if (!(flags & (AC_ELD | AC_SCALABLE | AC_BSAC | AC_USAC | AC_RSVD50 | + AC_RSV603DA))) /* If not ELD nor Scalable nor BSAC nor USAC + syntax then ... */ + { + if ((UCHAR)FDKreadBits(bs, 1) != 0) /* UCHAR PredictorDataPresent */ + { + ErrorStatus = AAC_DEC_UNSUPPORTED_PREDICTION; + goto bail; + } + } + + pIcsInfo->WindowGroups = 1; + pIcsInfo->WindowGroupLength[0] = 1; + } else { + INT i; + UINT mask; + + pIcsInfo->ScaleFactorGrouping = (UCHAR)FDKreadBits(bs, 7); + + pIcsInfo->WindowGroups = 0; + + for (i = 0; i < (8 - 1); i++) { + mask = 1 << (6 - i); + pIcsInfo->WindowGroupLength[i] = 1; + + if (pIcsInfo->ScaleFactorGrouping & mask) { + pIcsInfo->WindowGroupLength[pIcsInfo->WindowGroups]++; + } else { + pIcsInfo->WindowGroups++; + } + } + + /* loop runs to i < 7 only */ + pIcsInfo->WindowGroupLength[8 - 1] = 1; + pIcsInfo->WindowGroups++; + } + +bail: + if (ErrorStatus == AAC_DEC_OK) pIcsInfo->Valid = 1; + + return ErrorStatus; +} + +/* + interleave codebooks the following way + + 9 (84w) | 1 (51w) + 10 (82w) | 2 (39w) + SCL (65w) | 4 (38w) + 3 (39w) | 5 (41w) + | 6 (40w) + | 7 (31w) + | 8 (31w) + (270w) (271w) +*/ + +/* + Table entries are sorted as following: + | num_swb_long_window | sfbands_long | num_swb_short_window | sfbands_short | +*/ +AAC_DECODER_ERROR getSamplingRateInfo(SamplingRateInfo *t, UINT samplesPerFrame, + UINT samplingRateIndex, + UINT samplingRate) { + int index = 0; + + /* Search closest samplerate according to ISO/IEC 13818-7:2005(E) 8.2.4 (Table + * 38): */ + if ((samplingRateIndex >= 15) || (samplesPerFrame == 768)) { + const UINT borders[] = {(UINT)-1, 92017, 75132, 55426, 46009, 37566, + 27713, 23004, 18783, 13856, 11502, 9391}; + UINT i, samplingRateSearch = samplingRate; + + if (samplesPerFrame == 768) { + samplingRateSearch = (samplingRate * 4) / 3; + } + + for (i = 0; i < 11; i++) { + if (borders[i] > samplingRateSearch && + samplingRateSearch >= borders[i + 1]) { + break; + } + } + samplingRateIndex = i; + } + + t->samplingRateIndex = samplingRateIndex; + t->samplingRate = samplingRate; + + switch (samplesPerFrame) { + case 1024: + index = 0; + break; + case 960: + index = 1; + break; + case 768: + index = 2; + break; + case 512: + index = 3; + break; + case 480: + index = 4; + break; + + default: + return AAC_DEC_UNSUPPORTED_FORMAT; + } + + t->ScaleFactorBands_Long = + sfbOffsetTables[index][samplingRateIndex].sfbOffsetLong; + t->ScaleFactorBands_Short = + sfbOffsetTables[index][samplingRateIndex].sfbOffsetShort; + t->NumberOfScaleFactorBands_Long = + sfbOffsetTables[index][samplingRateIndex].numberOfSfbLong; + t->NumberOfScaleFactorBands_Short = + sfbOffsetTables[index][samplingRateIndex].numberOfSfbShort; + + if (t->ScaleFactorBands_Long == NULL || + t->NumberOfScaleFactorBands_Long == 0) { + t->samplingRate = 0; + return AAC_DEC_UNSUPPORTED_FORMAT; + } + + FDK_ASSERT((UINT)t->ScaleFactorBands_Long[t->NumberOfScaleFactorBands_Long] == + samplesPerFrame); + FDK_ASSERT( + t->ScaleFactorBands_Short == NULL || + (UINT)t->ScaleFactorBands_Short[t->NumberOfScaleFactorBands_Short] * 8 == + samplesPerFrame); + + return AAC_DEC_OK; +} |