mirror of https://github.com/mstorsjo/fdk-aac.git
515 lines
22 KiB
C
515 lines
22 KiB
C
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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 - 2013 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V.
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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 that implements
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the MPEG Advanced Audio Coding ("AAC") encoding and decoding scheme for digital audio.
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This FDK AAC Codec software is intended to be used on 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 general perceptual
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audio codecs. AAC-ELD is considered the best-performing full-bandwidth communications codec by
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independent studies and is widely deployed. AAC has been standardized by ISO and IEC as part
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of the MPEG specifications.
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Patent licenses for necessary patent claims for the FDK AAC Codec (including those of Fraunhofer)
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may be obtained through Via Licensing (www.vialicensing.com) or through the respective patent owners
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individually for the purpose of encoding or decoding bit streams in products that are compliant with
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the ISO/IEC MPEG audio standards. Please note that most manufacturers of Android devices already license
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these patent claims through Via Licensing or directly from the patent owners, and therefore FDK AAC Codec
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software may already be covered under those patent licenses when it is used for those licensed purposes only.
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Commercially-licensed AAC software libraries, including floating-point versions with enhanced sound quality,
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are also available from Fraunhofer. Users are encouraged to check the Fraunhofer website for additional
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applications 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, are permitted without
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payment of copyright license fees provided that you satisfy the following conditions:
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You must retain the complete text of this software license in redistributions of the FDK AAC Codec or
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your modifications thereto in source code form.
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You must retain the complete text of this software license in the documentation and/or other materials
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provided with redistributions of the FDK AAC Codec or your modifications thereto in binary form.
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You must make available free of 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 from this library without
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prior written permission.
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You may not charge copyright license fees for anyone to use, copy or distribute the FDK AAC Codec
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software or your modifications thereto.
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Your modified versions of the FDK AAC Codec must carry prominent notices stating that you changed the software
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and the date of any change. For modified versions of the FDK AAC Codec, the term
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"Fraunhofer FDK AAC Codec Library for Android" must be replaced by the term
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"Third-Party Modified Version of the Fraunhofer FDK 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 limitation the patents of Fraunhofer,
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ARE GRANTED BY THIS SOFTWARE LICENSE. Fraunhofer provides no warranty of patent non-infringement with
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respect to this software.
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You may use this FDK AAC Codec software or modifications thereto only for purposes that are authorized
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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 holders and contributors
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"AS IS" and WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES, including but not limited to the implied warranties
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of merchantability and 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, or consequential damages,
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including but not limited to procurement of substitute goods or services; loss of use, data, or profits,
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or business interruption, 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 this software, even if
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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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/************************** MPEG-4 Transport Decoder ***********************
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Author(s): Manuel Jander
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Description: MPEG Transport decoder
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******************************************************************************/
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#ifndef __TPDEC_LIB_H__
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#define __TPDEC_LIB_H__
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#include "tp_data.h"
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#include "FDK_bitstream.h"
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#define TRANSPORTDEC_INBUF_SIZE ( 8192 ) /*!< Size is in bytes.
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Set the transport input buffer size carefully and
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assure that it fulfills the requirements of the
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supported transport format(s). */
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typedef enum {
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TRANSPORTDEC_OK = 0, /*!< All fine. */
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/* Synchronization errors. Wait for new input data and try again. */
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tpdec_sync_error_start = 0x100,
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TRANSPORTDEC_NOT_ENOUGH_BITS, /*!< Out of bits. Provide more bits and try again. */
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TRANSPORTDEC_SYNC_ERROR, /*!< No sync was found or sync got lost. Keep trying. */
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tpdec_sync_error_end,
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/* Decode errors. Mostly caused due to bit errors. */
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tpdec_decode_error_start = 0x400,
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TRANSPORTDEC_PARSE_ERROR, /*!< Bitstream data showed inconsistencies (wrong syntax). */
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TRANSPORTDEC_UNSUPPORTED_FORMAT, /*!< Unsupported format or feature found in the bitstream data. */
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TRANSPORTDEC_CRC_ERROR, /*!< CRC error encountered in bitstream data. */
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tpdec_decode_error_end,
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/* Fatal errors. Stop immediately on one of these errors! */
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tpdec_fatal_error_start = 0x200,
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TRANSPORTDEC_UNKOWN_ERROR, /*!< An unknown error occured. */
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TRANSPORTDEC_INVALID_PARAMETER, /*!< An invalid parameter was passed to a function. */
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TRANSPORTDEC_NEED_TO_RESTART, /*!< The decoder needs to be restarted, since the requiered
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configuration change cannot be performed. */
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tpdec_fatal_error_end
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} TRANSPORTDEC_ERROR;
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/** Macro to identify decode errors. */
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#define TPDEC_IS_DECODE_ERROR(err) ( ((err>=tpdec_decode_error_start) && (err<=tpdec_decode_error_end)) ? 1 : 0)
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/** Macro to identify fatal errors. */
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#define TPDEC_IS_FATAL_ERROR(err) ( ((err>=tpdec_fatal_error_start) && (err<=tpdec_fatal_error_end)) ? 1 : 0)
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/**
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* \brief Parameter identifiers for transportDec_SetParam()
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*/
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typedef enum {
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TPDEC_PARAM_MINIMIZE_DELAY = 1, /** Delay minimization strategy. 0: none, 1: discard as many frames as possible. */
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TPDEC_PARAM_EARLY_CONFIG, /** Enable early config discovery. */
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TPDEC_PARAM_IGNORE_BUFFERFULLNESS, /** Ignore buffer fullness. */
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TPDEC_PARAM_SET_BITRATE, /** Set average bit rate for bit stream interruption frame misses estimation. */
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TPDEC_PARAM_RESET, /** Reset transport decoder instance status. */
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TPDEC_PARAM_BURST_PERIOD /** Set data reception burst period in mili seconds. */
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} TPDEC_PARAM;
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/* ISO/IEC 14496-3 4.4.1.1 Table 4.2 Program config element */
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#define PC_FSB_CHANNELS_MAX 16 /* Front/Side/Back channels */
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#define PC_LFE_CHANNELS_MAX 4
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#define PC_ASSOCDATA_MAX 8
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#define PC_CCEL_MAX 16 /* CC elements */
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#define PC_COMMENTLENGTH 256
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/*!
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\brief Reset Program Config Element.
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\param pPce Program Config Element structure.
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\return void
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*/
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void CProgramConfig_Reset ( CProgramConfig *pPce );
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/*!
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\brief Initialize Program Config Element.
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\param pPce Program Config Element structure.
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\return void
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*/
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void CProgramConfig_Init ( CProgramConfig *pPce );
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/*!
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\brief Inquire state of present Program Config Element structure.
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\param pPce Program Config Element structure.
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\return 1 if the PCE structure is filled correct,
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0 if no valid PCE present.
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*/
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int CProgramConfig_IsValid ( const CProgramConfig *pPce );
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#ifdef TP_PCE_ENABLE
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/*!
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\brief Read Program Config Element.
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\param pPce Program Config Element structure.
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\param bs Bitstream buffer to read from.
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\param alignAnchor Align bitstream to alignAnchor bits after all read operations.
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\return void
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*/
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void CProgramConfig_Read ( CProgramConfig *pPce,
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HANDLE_FDK_BITSTREAM bs,
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UINT alignAnchor );
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/*!
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\brief Compare two Program Config Elements.
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\param pPce1 Pointer to first Program Config Element structure.
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\param pPce2 Pointer to second Program Config Element structure.
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\return -1 if PCEs are completely different,
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0 if PCEs are completely equal,
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1 if PCEs are different but have the same channel config,
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2 if PCEs have different channel config but same number of channels.
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*/
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int CProgramConfig_Compare ( const CProgramConfig * const pPce1,
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const CProgramConfig * const pPce2 );
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/*!
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\brief Get a Program Config Element that matches the predefined MPEG-4 channel configurations 1-14.
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\param pPce Program Config Element structure.
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\param channelConfig MPEG-4 channel configuration.
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\return void
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*/
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void CProgramConfig_GetDefault ( CProgramConfig *pPce,
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const UINT channelConfig );
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#endif /* TP_PCE_ENABLE */
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/**
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* \brief Lookup and verify a given element. The decoder calls this
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* method with every new element ID found in the bitstream.
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*
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* \param pPce A valid Program config structure.
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* \param tag Tag of the current element to be looked up.
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* \param channelIdx The current channel count of the decoder parser.
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* \param chMapping Array to store the canonical channel mapping indexes.
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* \param chType Array to store the audio channel type.
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* \param chIndex Array to store the individual audio channel type index.
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* \param elMapping Pointer where the canonical element index is stored.
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* \param elType The element id of the current element to be looked up.
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*
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* \return Non-zero if the element belongs to the current program, zero
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* if it does not.
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*/
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int CProgramConfig_LookupElement(
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CProgramConfig *pPce,
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UINT channelConfig,
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const UINT tag,
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const UINT channelIdx,
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UCHAR chMapping[],
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AUDIO_CHANNEL_TYPE chType[],
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UCHAR chIndex[],
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UCHAR *elMapping,
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MP4_ELEMENT_ID elList[],
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MP4_ELEMENT_ID elType
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);
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/**
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* \brief Get table of elements in canonical order.
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* \param pPce A valid program config structure.
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* \param table An array where the element IDs are stored.
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* \return Total element count including all SCE, CPE and LFE.
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*/
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int CProgramConfig_GetElementTable( const CProgramConfig *pPce,
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MP4_ELEMENT_ID table[],
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const INT elListSize );
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/**
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* \brief Initialize a given AudioSpecificConfig structure.
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* \param pAsc A pointer to an allocated CSAudioSpecificConfig struct.
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* \return void
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*/
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void AudioSpecificConfig_Init(CSAudioSpecificConfig *pAsc);
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/**
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* \brief Parse a AudioSpecificConfig from a given bitstream handle.
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*
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* \param pAsc A pointer to an allocated CSAudioSpecificConfig struct.
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* \param hBs Bitstream handle.
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* \param fExplicitBackwardCompatible Do explicit backward compatibility parsing if set (flag).
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* \param cb pointer to structure holding callback information
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*
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* \return Total element count including all SCE, CPE and LFE.
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*/
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TRANSPORTDEC_ERROR AudioSpecificConfig_Parse(
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CSAudioSpecificConfig *pAsc,
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HANDLE_FDK_BITSTREAM hBs,
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int fExplicitBackwardCompatible,
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CSTpCallBacks *cb
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);
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/* CELP stuff */
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enum {
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MPE = 0,
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RPE = 1,
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fs8KHz = 0,
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fs16KHz = 1
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};
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/* Defintion of flags that can be passed to transportDecOpen() */
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#define TP_FLAG_MPEG4 1
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/* Capability flags */
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#define CAPF_TPDEC_ADIF 0x00001000 /**< Flag indicating support for ADIF transport format. */
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#define CAPF_TPDEC_ADTS 0x00002000 /**< Flag indicating support for ADTS transport format. */
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#define CAPF_TPDEC_LOAS 0x00004000 /**< Flag indicating support for LOAS transport format. */
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#define CAPF_TPDEC_LATM 0x00008000 /**< Flag indicating support for LATM transport format. */
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#define CAPF_TPDEC_RAWPACKETS 0x00010000 /**< Flag indicating support for raw packets transport format. */
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typedef struct TRANSPORTDEC *HANDLE_TRANSPORTDEC;
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/**
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* \brief Configure Transport Decoder via a binary coded AudioSpecificConfig or StreamMuxConfig.
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* The previously requested configuration callback will be called as well. The buffer conf
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* must containt a SMC in case of LOAS/LATM transport format, and an ASC elseways.
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*
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* \param hTp Handle of a transport decoder.
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* \param conf UCHAR buffer of the binary coded config (ASC or SMC).
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* \param length The length in bytes of the conf buffer.
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*
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* \return Error code.
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*/
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TRANSPORTDEC_ERROR transportDec_OutOfBandConfig( const HANDLE_TRANSPORTDEC hTp,
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UCHAR *conf,
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const UINT length,
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const UINT layer );
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/**
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* \brief Open Transport medium for reading.
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*
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* \param transportDecFmt Format of the transport decoder medium to be accessed.
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* \param flags Transport decoder flags. Currently only TP_FLAG_MPEG4, which signals a
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* MPEG4 capable decoder (relevant for ADTS only).
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*
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* \return A pointer to a valid and allocated HANDLE_TRANSPORTDEC or a null pointer on failure.
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*/
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HANDLE_TRANSPORTDEC transportDec_Open( TRANSPORT_TYPE transportDecFmt,
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const UINT flags );
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/**
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* \brief Register configuration change callback.
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* \param hTp Handle of transport decoder.
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* \param cbUpdateConfig Pointer to a callback function to handle audio config changes.
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* \param user_data void pointer for user data passed to the callback as first parameter.
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* \return 0 on success.
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*/
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int transportDec_RegisterAscCallback (
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HANDLE_TRANSPORTDEC hTp,
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const cbUpdateConfig_t cbUpdateConfig,
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void* user_data );
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/**
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* \brief Register SSC parser callback.
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* \param hTp Handle of transport decoder.
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* \param cbUpdateConfig Pointer to a callback function to handle SSC parsing.
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* \param user_data void pointer for user data passed to the callback as first parameter.
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* \return 0 on success.
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*/
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int transportDec_RegisterSscCallback (
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HANDLE_TRANSPORTDEC hTp,
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const cbSsc_t cbSscParse,
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void* user_data );
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/**
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* \brief Register SBR header parser callback.
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* \param hTp Handle of transport decoder.
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* \param cbUpdateConfig Pointer to a callback function to handle SBR header parsing.
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* \param user_data void pointer for user data passed to the callback as first parameter.
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* \return 0 on success.
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*/
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int transportDec_RegisterSbrCallback( HANDLE_TRANSPORTDEC hTpDec, const cbSbr_t cbSbr, void* user_data);
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/**
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* \brief Fill internal input buffer with bitstream data from the external input buffer.
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* The function only copies such data as long as the decoder-internal input buffer is not full.
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* So it grabs whatever it can from pBuffer and returns information (bytesValid) so that at a
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* subsequent call of %transportDec_FillData(), the right position in pBuffer can be determined to
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* grab the next data.
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*
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* \param hTp Handle of transportDec.
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* \param pBuffer Pointer to external input buffer.
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* \param bufferSize Size of external input buffer. This argument is required because decoder-internally
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* we need the information to calculate the offset to pBuffer, where the next
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* available data is, which is then fed into the decoder-internal buffer (as much
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* as possible). Our example framework implementation fills the buffer at pBuffer
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* again, once it contains no available valid bytes anymore (meaning bytesValid equal 0).
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* \param bytesValid Number of bitstream bytes in the external bitstream buffer that have not yet been
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* copied into the decoder's internal bitstream buffer by calling this function.
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* The value is updated according to the amount of newly copied bytes.
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* \param layer The layer the bitstream belongs to.
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* \return Error code.
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*/
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TRANSPORTDEC_ERROR transportDec_FillData(
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const HANDLE_TRANSPORTDEC hTp,
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UCHAR *pBuffer,
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const UINT bufferSize,
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UINT *pBytesValid,
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const INT layer );
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/**
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* \brief Get transportDec bitstream handle.
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* \param hTp Pointer to a transport decoder handle.
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* \return HANDLE_FDK_BITSTREAM bitstream handle.
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*/
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HANDLE_FDK_BITSTREAM transportDec_GetBitstream ( const HANDLE_TRANSPORTDEC hTp, const UINT layer );
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/**
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* \brief Get transport format.
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* \param hTp Pointer to a transport decoder handle.
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* \return The transport format.
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*/
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TRANSPORT_TYPE transportDec_GetFormat ( const HANDLE_TRANSPORTDEC hTp );
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/**
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* \brief Get the current buffer fullness value.
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*
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* \param hTp Handle of a transport decoder.
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*
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* \return Buffer fullness
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*/
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INT transportDec_GetBufferFullness( const HANDLE_TRANSPORTDEC hTp );
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/**
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* \brief Close and deallocate transportDec.
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* \param phTp Pointer to a previously allocated transport decoder handle.
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* \return void
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*/
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void transportDec_Close ( HANDLE_TRANSPORTDEC *phTp );
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/**
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* \brief Read one access unit from the transportDec medium.
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* \param hTp Handle of transportDec.
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* \param length On return, this value is overwritten with the actual access unit length in bits.
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* Set to -1 if length is unknown.
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* \return Error code.
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*/
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TRANSPORTDEC_ERROR transportDec_ReadAccessUnit ( const HANDLE_TRANSPORTDEC hTp, const UINT layer );
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/**
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* \brief Get the remaining amount of bits of the current access unit. The result
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* can be below zero, meaning that too many bits have been read.
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* \param hTp Handle of transportDec.
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* \return amount of remaining bits.
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*/
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INT transportDec_GetAuBitsRemaining( const HANDLE_TRANSPORTDEC hTp, const UINT layer );
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/**
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* \brief Get the total amount of bits of the current access unit.
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* \param hTp Handle of transportDec.
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* \return amount of total bits.
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*/
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INT transportDec_GetAuBitsTotal( const HANDLE_TRANSPORTDEC hTp, const UINT layer );
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/**
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* \brief This function is required to be called when the decoder has finished parsing
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* one Access Unit for bitstream housekeeping.
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* \param hTp Transport Handle.
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* \return Error code.
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*/
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TRANSPORTDEC_ERROR transportDec_EndAccessUnit ( const HANDLE_TRANSPORTDEC hTp );
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/**
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* \brief Obtain the amount of missing access units if applicable in case of
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* a bit stream synchronization error. Each time transportDec_ReadAccessUnit()
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* returns TRANSPORTDEC_SYNC_ERROR this function can be called to retrieve an estimate
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* of the amount of missing access units. This works only in case of constant average
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* bit rate (has to be known) and if the parameter TPDEC_PARAM_SET_BITRATE has been set
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* accordingly.
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* \param hTp Transport Handle.
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* \param pNAccessUnits pointer to a memory location where the estimated lost frame count will be stored into.
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* \return Error code.
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*/
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TRANSPORTDEC_ERROR transportDec_GetMissingAccessUnitCount ( INT *pNAccessUnits, HANDLE_TRANSPORTDEC hTp );
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/**
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* \brief Set a given setting.
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* \param hTp Transport Handle.
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* \param param Identifier of the parameter to be changed.
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* \param value Value for the parameter to be changed.
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* \return Error code.
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*/
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TRANSPORTDEC_ERROR transportDec_SetParam ( const HANDLE_TRANSPORTDEC hTp,
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const TPDEC_PARAM param,
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const INT value );
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/**
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* \brief Get number of subframes (for LATM or ADTS)
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* \param hTp Transport Handle.
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* \return Number of ADTS/LATM subframes (return 1 for all other transport types).
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*/
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UINT transportDec_GetNrOfSubFrames(HANDLE_TRANSPORTDEC hTp);
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/**
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* \brief Get info structure of transport decoder library.
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* \param info A pointer to an allocated LIB_INFO struct.
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* \return Error code.
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*/
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TRANSPORTDEC_ERROR transportDec_GetLibInfo( LIB_INFO *info );
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/* ADTS CRC support */
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/**
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* \brief Set current bitstream position as start of a new data region.
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* \param hTp Transport handle.
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* \param mBits Size in bits of the data region. Set to 0 if it should not be of a fixed size.
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* \return Data region ID, which should be used when calling transportDec_CrcEndReg().
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*/
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int transportDec_CrcStartReg ( const HANDLE_TRANSPORTDEC hTp,
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const INT mBits );
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/**
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* \brief Set end of data region.
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* \param hTp Transport handle.
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* \param reg Data region ID, opbtained from transportDec_CrcStartReg().
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* \return void
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*/
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void transportDec_CrcEndReg ( const HANDLE_TRANSPORTDEC hTp,
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const INT reg );
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/**
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* \brief Calculate ADTS crc and check if it is correct. The ADTS checksum is held internally.
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* \param hTp Transport handle.
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* \return Return TRANSPORTDEC_OK if the CRC is ok, or error if CRC is not correct.
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*/
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TRANSPORTDEC_ERROR transportDec_CrcCheck ( const HANDLE_TRANSPORTDEC hTp );
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#endif /* #ifndef __TPDEC_LIB_H__ */
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