libAACdec/src/channel.h

   1
   2 /* -----------------------------------------------------------------------------------------------------------
   3 Software License for The Fraunhofer FDK AAC Codec Library for Android
   4
   5 © Copyright  1995 - 2013 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V.
   6   All rights reserved.
   7
   8  1.    INTRODUCTION
   9 The Fraunhofer FDK AAC Codec Library for Android ("FDK AAC Codec") is software that implements
  10 the MPEG Advanced Audio Coding ("AAC") encoding and decoding scheme for digital audio.
  11 This FDK AAC Codec software is intended to be used on a wide variety of Android devices.
  12
  13 AAC's HE-AAC and HE-AAC v2 versions are regarded as today's most efficient general perceptual
  14 audio codecs. AAC-ELD is considered the best-performing full-bandwidth communications codec by
  15 independent studies and is widely deployed. AAC has been standardized by ISO and IEC as part
  16 of the MPEG specifications.
  17
  18 Patent licenses for necessary patent claims for the FDK AAC Codec (including those of Fraunhofer)
  19 may be obtained through Via Licensing (www.vialicensing.com) or through the respective patent owners
  20 individually for the purpose of encoding or decoding bit streams in products that are compliant with
  21 the ISO/IEC MPEG audio standards. Please note that most manufacturers of Android devices already license
  22 these patent claims through Via Licensing or directly from the patent owners, and therefore FDK AAC Codec
  23 software may already be covered under those patent licenses when it is used for those licensed purposes only.
  24
  25 Commercially-licensed AAC software libraries, including floating-point versions with enhanced sound quality,
  26 are also available from Fraunhofer. Users are encouraged to check the Fraunhofer website for additional
  27 applications information and documentation.
  28
  29 2.    COPYRIGHT LICENSE
  30
  31 Redistribution and use in source and binary forms, with or without modification, are permitted without
  32 payment of copyright license fees provided that you satisfy the following conditions:
  33
  34 You must retain the complete text of this software license in redistributions of the FDK AAC Codec or
  35 your modifications thereto in source code form.
  36
  37 You must retain the complete text of this software license in the documentation and/or other materials
  38 provided with redistributions of the FDK AAC Codec or your modifications thereto in binary form.
  39 You must make available free of charge copies of the complete source code of the FDK AAC Codec and your
  40 modifications thereto to recipients of copies in binary form.
  41
  42 The name of Fraunhofer may not be used to endorse or promote products derived from this library without
  43 prior written permission.
  44
  45 You may not charge copyright license fees for anyone to use, copy or distribute the FDK AAC Codec
  46 software or your modifications thereto.
  47
  48 Your modified versions of the FDK AAC Codec must carry prominent notices stating that you changed the software
  49 and the date of any change. For modified versions of the FDK AAC Codec, the term
  50 "Fraunhofer FDK AAC Codec Library for Android" must be replaced by the term
  51 "Third-Party Modified Version of the Fraunhofer FDK AAC Codec Library for Android."
  52
  53 3.    NO PATENT LICENSE
  54
  55 NO EXPRESS OR IMPLIED LICENSES TO ANY PATENT CLAIMS, including without limitation the patents of Fraunhofer,
  56 ARE GRANTED BY THIS SOFTWARE LICENSE. Fraunhofer provides no warranty of patent non-infringement with
  57 respect to this software.
  58
  59 You may use this FDK AAC Codec software or modifications thereto only for purposes that are authorized
  60 by appropriate patent licenses.
  61
  62 4.    DISCLAIMER
  63
  64 This FDK AAC Codec software is provided by Fraunhofer on behalf of the copyright holders and contributors
  65 "AS IS" and WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES, including but not limited to the implied warranties
  66 of merchantability and fitness for a particular purpose. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
  67 CONTRIBUTORS BE LIABLE for any direct, indirect, incidental, special, exemplary, or consequential damages,
  68 including but not limited to procurement of substitute goods or services; loss of use, data, or profits,
  69 or business interruption, however caused and on any theory of liability, whether in contract, strict
  70 liability, or tort (including negligence), arising in any way out of the use of this software, even if
  71 advised of the possibility of such damage.
  72
  73 5.    CONTACT INFORMATION
  74
  75 Fraunhofer Institute for Integrated Circuits IIS
  76 Attention: Audio and Multimedia Departments - FDK AAC LL
  77 Am Wolfsmantel 33
  78 91058 Erlangen, Germany
  79
  80 www.iis.fraunhofer.de/amm
  81 amm-info@iis.fraunhofer.de
  82 ----------------------------------------------------------------------------------------------------------- */
  83
  84 /*****************************  MPEG-4 AAC Decoder  **************************
  85
  86    Author(s):   Josef Hoepfl
  87    Description:
  88
  89 ******************************************************************************/
  90
  91 #ifndef CHANNEL_H
  92 #define CHANNEL_H
  93
  94 #include "common_fix.h"
  95
  96 #include "FDK_bitstream.h"
  97 #include "channelinfo.h"
  98 #include "tpdec_lib.h"
  99
 100 /**
 101  * \brief Init codeBook SFB indices (section data) with HCB_ESC. Useful for bitstreams
 102  * which do not have any section data, but still SFB's (scale factor bands). This has
 103  * the effect that upto the amount of transmitted SFB are treated as non-zero.
 104  * \param pAacDecoderChannelInfo channel info structure containing a valid icsInfo struct.
 105  */
 106 void CChannel_CodebookTableInit(CAacDecoderChannelInfo *pAacDecoderChannelInfo);
 107
 108 /**
 109  * \brief decode a channel element. To be called after CChannelElement_Read()
 110  * \param pAacDecoderChannelInfo pointer to channel data struct. Depending on el_channels either one or two.
 111  * \param pSamplingRateInfo pointer to sample rate information structure
 112  * \param el_channels amount of channels of the element to be decoded.
 113  * \param output pointer to time domain output buffer (ACELP)
 114  * \param stride factor for accessing output
 115  */
 116 void CChannelElement_Decode ( CAacDecoderChannelInfo *pAacDecoderChannelInfo[2],
 117                               CAacDecoderStaticChannelInfo *pAacDecoderStaticChannelInfo[2],
 118                               SamplingRateInfo *pSamplingRateInfo,
 119                               UINT flags,
 120                               int el_channels );
 121
 122
 123 /**
 124  * \brief Read channel element of given type from bitstream.
 125  * \param hBs bitstream handle to access bitstream data.
 126  * \param pAacDecoderChannelInfo pointer array to store channel information.
 127  * \param aot Audio Object Type
 128  * \param pSamplingRateInfo sampling rate info table.
 129  * \param flags parser guidance flags
 130  * \param numberOfChannels amoun of channels contained in the object to be parsed.
 131  * \param epConfig the current epConfig value obtained from the Audio Specific Config.
 132  * \param pTp transport decoder handle required for ADTS CRC checking.
 133  * ...
 134  * \return an AAC_DECODER_ERROR error code.
 135  */
 136 AAC_DECODER_ERROR CChannelElement_Read(HANDLE_FDK_BITSTREAM hBs,
 137                                        CAacDecoderChannelInfo *pAacDecoderChannelInfo[],
 138                                        CAacDecoderStaticChannelInfo *pAacDecoderStaticChannelInfo[],
 139                                        const AUDIO_OBJECT_TYPE aot,
 140                                        const SamplingRateInfo *pSamplingRateInfo,
 141                                        const UINT  flags,
 142                                        const UINT  frame_length,
 143                                        const UCHAR numberOfChannels,
 144                                        const SCHAR epConfig,
 145                                        HANDLE_TRANSPORTDEC pTpDec
 146                                        );
 147
 148 #endif /* #ifndef CHANNEL_H */