/* ----------------------------------------------------------------------------- Software License for The Fraunhofer FDK AAC Codec Library for Android © Copyright 1995 - 2020 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: *******************************************************************************/ #ifndef AACDECODER_H #define AACDECODER_H #include "common_fix.h" #include "FDK_bitstream.h" #include "channel.h" #include "tpdec_lib.h" #include "FDK_audio.h" #include "block.h" #include "genericStds.h" #include "FDK_qmf_domain.h" #include "sbrdecoder.h" #include "aacdec_drc.h" #include "pcmdmx_lib.h" #include "FDK_drcDecLib.h" #include "limiter.h" #include "FDK_delay.h" #define TIME_DATA_FLUSH_SIZE (128) #define TIME_DATA_FLUSH_SIZE_SF (7) #define AACDEC_MAX_NUM_PREROLL_AU_USAC (3) #if (AACDEC_MAX_NUM_PREROLL_AU < 3) #undef AACDEC_MAX_NUM_PREROLL_AU #define AACDEC_MAX_NUM_PREROLL_AU AACDEC_MAX_NUM_PREROLL_AU_USAC #endif typedef struct AAC_DECODER_INSTANCE *HANDLE_AACDECODER; enum { L = 0, R = 1 }; typedef struct { unsigned char *buffer; int bufferSize; int offset[8]; int nrElements; } CAncData; typedef enum { NOT_DEFINED = -1, MODE_HQ = 0, MODE_LP = 1 } QMF_MODE; typedef struct { int bsDelay; } SBR_PARAMS; enum { AACDEC_FLUSH_OFF = 0, AACDEC_RSV60_CFG_CHANGE_ATSC_FLUSH_ON = 1, AACDEC_RSV60_DASH_IPF_ATSC_FLUSH_ON = 2, AACDEC_USAC_DASH_IPF_FLUSH_ON = 3 }; enum { AACDEC_BUILD_UP_OFF = 0, AACDEC_RSV60_BUILD_UP_ON = 1, AACDEC_RSV60_BUILD_UP_ON_IN_BAND = 2, AACDEC_USAC_BUILD_UP_ON = 3, AACDEC_RSV60_BUILD_UP_IDLE = 4, AACDEC_RSV60_BUILD_UP_IDLE_IN_BAND = 5 }; #define AACDEC_CROSSFADE_BITMASK_OFF \ ((UCHAR)0) /*!< No cross-fade between frames shall be applied at next \ config change. */ #define AACDEC_CROSSFADE_BITMASK_PREROLL \ ((UCHAR)1 << 1) /*!< applyCrossfade is signaled in AudioPreRoll */ typedef struct { /* Usac Extension Elements */ USAC_EXT_ELEMENT_TYPE usacExtElementType[(3)]; UINT usacExtElementDefaultLength[(3)]; UCHAR usacExtElementPayloadFrag[(3)]; } CUsacCoreExtensions; /* AAC decoder (opaque toward userland) struct declaration */ struct AAC_DECODER_INSTANCE { INT aacChannels; /*!< Amount of AAC decoder channels allocated. */ INT ascChannels[(1 * 1)]; /*!< Amount of AAC decoder channels signalled in ASC. */ INT blockNumber; /*!< frame counter */ INT nrOfLayers; INT outputInterleaved; /*!< PCM output format (interleaved/none interleaved). */ INT aacOutDataHeadroom; /*!< Headroom of the output time signal to prevent clipping */ HANDLE_TRANSPORTDEC hInput; /*!< Transport layer handle. */ SamplingRateInfo samplingRateInfo[(1 * 1)]; /*!< Sampling Rate information table */ UCHAR frameOK; /*!< Will be unset if a consistency check, e.g. CRC etc. fails */ UINT flags[(1 * 1)]; /*!< Flags for internal decoder use. DO NOT USE self::streaminfo::flags ! */ UINT elFlags[(3 * ((8) * 2) + (((8) * 2)) / 2 + 4 * (1) + 1)]; /*!< Flags for internal decoder use (element specific). DO NOT USE self::streaminfo::flags ! */ MP4_ELEMENT_ID elements[(3 * ((8) * 2) + (((8) * 2)) / 2 + 4 * (1) + 1)]; /*!< Table where the element Id's are listed */ UCHAR elTags[(3 * ((8) * 2) + (((8) * 2)) / 2 + 4 * (1) + 1)]; /*!< Table where the elements id Tags are listed */ UCHAR chMapping[((8) * 2)]; /*!< Table of MPEG canonical order to bitstream channel order mapping. */ AUDIO_CHANNEL_TYPE channelType[(8)]; /*!< Audio channel type of each output audio channel (from 0 upto numChannels). */ UCHAR channelIndices[(8)]; /*!< Audio channel index for each output audio channel (from 0 upto numChannels). */ /* See ISO/IEC 13818-7:2005(E), 8.5.3.2 Explicit channel mapping using a * program_config_element() */ FDK_channelMapDescr mapDescr; /*!< Describes the output channel mapping. */ UCHAR chMapIndex; /*!< Index to access one line of the channelOutputMapping table. This is required because not all 8 channel configurations have the same output mapping. */ INT sbrDataLen; /*!< Expected length of the SBR remaining in bitbuffer after the AAC payload has been pared. */ CProgramConfig pce; CStreamInfo streamInfo; /*!< Pointer to StreamInfo data (read from the bitstream) */ CAacDecoderChannelInfo *pAacDecoderChannelInfo[(8)]; /*!< Temporal channel memory */ CAacDecoderStaticChannelInfo *pAacDecoderStaticChannelInfo[(8)]; /*!< Persistent channel memory */ FIXP_DBL *workBufferCore1; FIXP_DBL *workBufferCore2; PCM_DEC *pTimeData2; INT timeData2Size; CpePersistentData *cpeStaticData[( 3 * ((8) * 2) + (((8) * 2)) / 2 + 4 * (1) + 1)]; /*!< Pointer to persistent data shared by both channels of a CPE. This structure is allocated once for each CPE. */ CConcealParams concealCommonData; CConcealmentMethod concealMethodUser; CUsacCoreExtensions usacCoreExt; /*!< Data and handles to extend USAC FD/LPD core decoder (SBR, MPS, ...) */ UINT numUsacElements[(1 * 1)]; UCHAR usacStereoConfigIndex[(3 * ((8) * 2) + (((8) * 2)) / 2 + 4 * (1) + 1)]; const CSUsacConfig *pUsacConfig[(1 * 1)]; INT nbDiv; /*!< number of frame divisions in LPD-domain */ UCHAR useLdQmfTimeAlign; INT aacChannelsPrev; /*!< The amount of AAC core channels of the last successful decode call. */ AUDIO_CHANNEL_TYPE channelTypePrev[(8)]; /*!< Array holding the channelType values of the last successful decode call. */ UCHAR channelIndicesPrev[(8)]; /*!< Array holding the channelIndices values of the last successful decode call. */ UCHAR downscaleFactor; /*!< Variable to store a supported ELD downscale factor of 1, 2, 3 or 4 */ UCHAR downscaleFactorInBS; /*!< Variable to store the (not necessarily supported) ELD downscale factor discovered in the bitstream */ HANDLE_SBRDECODER hSbrDecoder; /*!< SBR decoder handle. */ UCHAR sbrEnabled; /*!< flag to store if SBR has been detected */ UCHAR sbrEnabledPrev; /*!< flag to store if SBR has been detected from previous frame */ UCHAR psPossible; /*!< flag to store if PS is possible */ SBR_PARAMS sbrParams; /*!< struct to store all sbr parameters */ UCHAR *pDrmBsBuffer; /*!< Pointer to dynamic buffer which is used to reverse the bits of the DRM SBR payload */ USHORT drmBsBufferSize; /*!< Size of the dynamic buffer which is used to reverse the bits of the DRM SBR payload */ FDK_QMF_DOMAIN qmfDomain; /*!< Instance of module for QMF domain data handling */ QMF_MODE qmfModeCurr; /*!< The current QMF mode */ QMF_MODE qmfModeUser; /*!< The QMF mode requested by the library user */ HANDLE_AAC_DRC hDrcInfo; /*!< handle to DRC data structure */ INT metadataExpiry; /*!< Metadata expiry time in milli-seconds. */ void *pMpegSurroundDecoder; /*!< pointer to mpeg surround decoder structure */ UCHAR mpsEnableUser; /*!< MPS enable user flag */ UCHAR mpsEnableCurr; /*!< MPS enable decoder state */ UCHAR mpsApplicable; /*!< MPS applicable */ SCHAR mpsOutputMode; /*!< setting: normal = 0, binaural = 1, stereo = 2, 5.1ch = 3 */ INT mpsOutChannelsLast; /*!< The amount of channels returned by the last successful MPS decoder call. */ INT mpsFrameSizeLast; /*!< The frame length returned by the last successful MPS decoder call. */ CAncData ancData; /*!< structure to handle ancillary data */ HANDLE_PCM_DOWNMIX hPcmUtils; /*!< privat data for the PCM utils. */ TDLimiterPtr hLimiter; /*!< Handle of time domain limiter. */ UCHAR limiterEnableUser; /*!< The limiter configuration requested by the library user */ UCHAR limiterEnableCurr; /*!< The current limiter configuration. */ FIXP_DBL extGain[1]; /*!< Gain that must be applied to the output signal. */ UINT extGainDelay; /*!< Delay that must be accounted for extGain. */ HANDLE_DRC_DECODER hUniDrcDecoder; UCHAR multibandDrcPresent; UCHAR numTimeSlots; UINT loudnessInfoSetPosition[3]; SCHAR defaultTargetLoudness; PCM_DEC *pTimeDataFlush[((8) * 2)]; /*!< Pointer to the flushed time data which will be used for the crossfade in case of an USAC DASH IPF config change */ UCHAR flushStatus; /*!< Indicates flush status: on|off */ SCHAR flushCnt; /*!< Flush frame counter */ UCHAR buildUpStatus; /*!< Indicates build up status: on|off */ SCHAR buildUpCnt; /*!< Build up frame counter */ UCHAR hasAudioPreRoll; /*!< Indicates preRoll status: on|off */ UINT prerollAULength[AACDEC_MAX_NUM_PREROLL_AU + 1]; /*!< Relative offset of the prerollAU end position to the AU start position in the bitstream */ INT accessUnit; /*!< Number of the actual processed preroll accessUnit */ UCHAR applyCrossfade; /*!< If any bit is set, cross-fade for seamless stream switching is applied */ FDK_SignalDelay usacResidualDelay; /*!< Delay residual signal to compensate for eSBR delay of DMX signal in case of stereoConfigIndex==2. */ }; #define AAC_DEBUG_EXTHLP \ "\ --- AAC-Core ---\n\ 0x00010000 Header data\n\ 0x00020000 CRC data\n\ 0x00040000 Channel info\n\ 0x00080000 Section data\n\ 0x00100000 Scalefactor data\n\ 0x00200000 Pulse data\n\ 0x00400000 Tns data\n\ 0x00800000 Quantized spectrum\n\ 0x01000000 Requantized spectrum\n\ 0x02000000 Time output\n\ 0x04000000 Fatal errors\n\ 0x08000000 Buffer fullness\n\ 0x10000000 Average bitrate\n\ 0x20000000 Synchronization\n\ 0x40000000 Concealment\n\ 0x7FFF0000 all AAC-Core-Info\n\ " /** * \brief Synchronise QMF mode for all modules using QMF data. * \param self decoder handle */ void CAacDecoder_SyncQmfMode(HANDLE_AACDECODER self); /** * \brief Signal a bit stream interruption to the decoder * \param self decoder handle */ void CAacDecoder_SignalInterruption(HANDLE_AACDECODER self); /*! \brief Initialize ancillary buffer \ancData Pointer to ancillary data structure \buffer Pointer to (external) anc data buffer \size Size of the buffer pointed on by buffer \return Error code */ AAC_DECODER_ERROR CAacDecoder_AncDataInit(CAncData *ancData, unsigned char *buffer, int size); /*! \brief Get one ancillary data element \ancData Pointer to ancillary data structure \index Index of the anc data element to get \ptr Pointer to a buffer receiving a pointer to the requested anc data element \size Pointer to a buffer receiving the length of the requested anc data element \return Error code */ AAC_DECODER_ERROR CAacDecoder_AncDataGet(CAncData *ancData, int index, unsigned char **ptr, int *size); /* initialization of aac decoder */ LINKSPEC_H HANDLE_AACDECODER CAacDecoder_Open(TRANSPORT_TYPE bsFormat); /* Initialization of channel elements */ LINKSPEC_H AAC_DECODER_ERROR CAacDecoder_Init(HANDLE_AACDECODER self, const CSAudioSpecificConfig *asc, UCHAR configMode, UCHAR *configChanged); /*! \brief Decodes one aac frame The function decodes one aac frame. The decoding of coupling channel elements are not supported. The transport layer might signal, that the data of the current frame is invalid, e.g. as a result of a packet loss in streaming mode. The bitstream position of transportDec_GetBitstream(self->hInput) must be exactly the end of the access unit, including all byte alignment bits. For this purpose, the variable auStartAnchor is used. \return error status */ LINKSPEC_H AAC_DECODER_ERROR CAacDecoder_DecodeFrame( HANDLE_AACDECODER self, const UINT flags, PCM_DEC *pTimeData, const INT timeDataSize, const int timeDataChannelOffset); /* Free config dependent AAC memory */ LINKSPEC_H AAC_DECODER_ERROR CAacDecoder_FreeMem(HANDLE_AACDECODER self, const int subStreamIndex); /* Prepare crossfade for USAC DASH IPF config change */ LINKSPEC_H AAC_DECODER_ERROR CAacDecoder_PrepareCrossFade( const PCM_DEC *pTimeData, PCM_DEC **pTimeDataFlush, const INT numChannels, const INT frameSize, const INT interleaved); /* Apply crossfade for USAC DASH IPF config change */ LINKSPEC_H AAC_DECODER_ERROR CAacDecoder_ApplyCrossFade( PCM_DEC *pTimeData, PCM_DEC **pTimeDataFlush, const INT numChannels, const INT frameSize, const INT interleaved); /* Set flush and build up mode */ LINKSPEC_H AAC_DECODER_ERROR CAacDecoder_CtrlCFGChange(HANDLE_AACDECODER self, UCHAR flushStatus, SCHAR flushCnt, UCHAR buildUpStatus, SCHAR buildUpCnt); /* Parse preRoll Extension Payload */ LINKSPEC_H AAC_DECODER_ERROR CAacDecoder_PreRollExtensionPayloadParse( HANDLE_AACDECODER self, UINT *numPrerollAU, UINT *prerollAUOffset, UINT *prerollAULength); /* Destroy aac decoder */ LINKSPEC_H void CAacDecoder_Close(HANDLE_AACDECODER self); /* get streaminfo handle from decoder */ LINKSPEC_H CStreamInfo *CAacDecoder_GetStreamInfo(HANDLE_AACDECODER self); #endif /* #ifndef AACDECODER_H */