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diff --git a/fdk-aac/libAACdec/include/aacdecoder_lib.h b/fdk-aac/libAACdec/include/aacdecoder_lib.h new file mode 100644 index 0000000..5f0dd02 --- /dev/null +++ b/fdk-aac/libAACdec/include/aacdecoder_lib.h @@ -0,0 +1,1090 @@ +/* ----------------------------------------------------------------------------- +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): Manuel Jander + + Description: + +*******************************************************************************/ + +#ifndef AACDECODER_LIB_H +#define AACDECODER_LIB_H + +/** + * \file aacdecoder_lib.h + * \brief FDK AAC decoder library interface header file. + * + +\page INTRO Introduction + + +\section SCOPE Scope + +This document describes the high-level application interface and usage of the +ISO/MPEG-2/4 AAC Decoder library developed by the Fraunhofer Institute for +Integrated Circuits (IIS). Depending on the library configuration, decoding of +AAC-LC (Low-Complexity), HE-AAC (High-Efficiency AAC v1 and v2), AAC-LD +(Low-Delay) and AAC-ELD (Enhanced Low-Delay) is implemented. + +All references to SBR (Spectral Band Replication) are only applicable to HE-AAC +and AAC-ELD configurations of the FDK library. All references to PS (Parametric +Stereo) are only applicable to HE-AAC v2 decoder configuration of the library. + +\section DecoderBasics Decoder Basics + +This document can only give a rough overview about the ISO/MPEG-2, ISO/MPEG-4 +AAC audio and MPEG-D USAC coding standards. To understand all details referenced +in this document, you are encouraged to read the following documents. + +- ISO/IEC 13818-7 (MPEG-2 AAC) Standard, defines the syntax of MPEG-2 AAC audio +bitstreams. +- ISO/IEC 14496-3 (MPEG-4 AAC, subpart 1 and 4) Standard, defines the syntax of +MPEG-4 AAC audio bitstreams. +- ISO/IEC 23003-3 (MPEG-D USAC), defines MPEG-D USAC unified speech and audio +codec. +- Lutzky, Schuller, Gayer, Krämer, Wabnik, "A guideline to audio codec +delay", 116th AES Convention, May 8, 2004 + +In short, MPEG Advanced Audio Coding is based on a time-to-frequency mapping of +the signal. The signal is partitioned into overlapping time portions and +transformed into frequency domain. The spectral components are then quantized +and coded using a highly efficient coding scheme.\n Encoded MPEG-2 and MPEG-4 +AAC audio bitstreams are composed of frames. Contrary to MPEG-1/2 Layer-3 (mp3), +the length of individual frames is not restricted to a fixed number of bytes, +but can take any length between 1 and 768 bytes. + +In addition to the above mentioned frequency domain coding mode, MPEG-D USAC +also employs a time domain Algebraic Code-Excited Linear Prediction (ACELP) +speech coder core. This operating mode is selected by the encoder in order to +achieve the optimum audio quality for different content type. Several +enhancements allow achieving higher quality at lower bit rates compared to +MPEG-4 HE-AAC. + + +\page LIBUSE Library Usage + + +\section InterfaceDescritpion API Description + +All API header files are located in the folder /include of the release package. +The contents of each file is described in detail in this document. All header +files are provided for usage in specific C/C++ programs. The main AAC decoder +library API functions are located in aacdecoder_lib.h header file. + +In binary releases the decoder core resides in statically linkable libraries, +for example libAACdec.a. + + +\section Calling_Sequence Calling Sequence + +The following sequence is necessary for proper decoding of ISO/MPEG-2/4 AAC, +HE-AAC v2, or MPEG-D USAC bitstreams. In the following description, input stream +read and output write function details are left out, since they may be +implemented in a variety of configurations depending on the user's specific +requirements. The example implementation uses file-based input/output, and in +such case one may call mpegFileRead_Open() to open an input file and to allocate +memory for the required structures, and the corresponding mpegFileRead_Close() +to close opened files and to de-allocate associated structures. +mpegFileRead_Open() will attempt to detect the bitstream format and in case of +MPEG-4 file format or Raw Packets file format (a proprietary Fraunhofer IIS file +format suitable only for testing) it will read the Audio Specific Config data +(ASC). An unsuccessful attempt to recognize the bitstream format requires the +user to provide this information manually. For any other bitstream formats that +are usually applicable in streaming applications, the decoder itself will try to +synchronize and parse the given bitstream fragment using the FDK transport +library. Hence, for streaming applications (without file access) this step is +not necessary. + + +-# Call aacDecoder_Open() to open and retrieve a handle to a new AAC decoder +instance. \code aacDecoderInfo = aacDecoder_Open(transportType, nrOfLayers); +\endcode +-# If out-of-band config data (Audio Specific Config (ASC) or Stream Mux Config +(SMC)) is available, call aacDecoder_ConfigRaw() to pass this data to the +decoder before beginning the decoding process. If this data is not available in +advance, the decoder will configure itself while decoding, during the +aacDecoder_DecodeFrame() function call. +-# Begin decoding loop. +\code +do { +\endcode +-# Read data from bitstream file or stream buffer in to the driver program +working memory (a client-supplied input buffer "inBuffer" in framework). This +buffer will be used to load AAC bitstream data to the decoder. Only when all +data in this buffer has been processed will the decoder signal an empty buffer. +For file-based input, you may invoke mpegFileRead_Read() to acquire new +bitstream data. +-# Call aacDecoder_Fill() to fill the decoder's internal bitstream input buffer +with the client-supplied bitstream input buffer. Note, if the data loaded in to +the internal buffer is not sufficient to decode a frame, +aacDecoder_DecodeFrame() will return ::AAC_DEC_NOT_ENOUGH_BITS until a +sufficient amount of data is loaded in to the internal buffer. For streaming +formats (ADTS, LOAS), it is acceptable to load more than one frame to the +decoder. However, for RAW file format (Fraunhofer IIS proprietary format), only +one frame may be loaded to the decoder per aacDecoder_DecodeFrame() call. For +least amount of communication delay, fill and decode should be performed on a +frame by frame basis. \code ErrorStatus = aacDecoder_Fill(aacDecoderInfo, +inBuffer, bytesRead, bytesValid); \endcode +-# Call aacDecoder_DecodeFrame(). This function decodes one frame and writes +decoded PCM audio data to a client-supplied buffer. It is the client's +responsibility to allocate a buffer which is large enough to hold the decoded +output data. \code ErrorStatus = aacDecoder_DecodeFrame(aacDecoderInfo, +TimeData, OUT_BUF_SIZE, flags); \endcode If the bitstream configuration (number +of channels, sample rate, frame size) is not known a priori, you may call +aacDecoder_GetStreamInfo() to retrieve a structure that contains this +information. You may use this data to initialize an audio output device. In the +example program, if the number of channels or the sample rate has changed since +program start or the previously decoded frame, the audio output device is then +re-initialized. If WAVE file output is chosen, a new WAVE file for each new +stream configuration is be created. \code p_si = +aacDecoder_GetStreamInfo(aacDecoderInfo); \endcode +-# Repeat steps 5 to 7 until no data is available to decode any more, or in case +of error. \code } while (bytesRead[0] > 0 || doFlush || doBsFlush || +forceContinue); \endcode +-# Call aacDecoder_Close() to de-allocate all AAC decoder and transport layer +structures. \code aacDecoder_Close(aacDecoderInfo); \endcode + +\image latex decode.png "Decode calling sequence" width=11cm + +\image latex change_source.png "Change data source sequence" width 5cm + +\image latex conceal.png "Error concealment sequence" width=14cm + +\subsection Error_Concealment_Sequence Error Concealment Sequence + +There are different strategies to handle bit stream errors. Depending on the +system properties the product designer might choose to take different actions in +case a bit error occurs. In many cases the decoder might be able to do +reasonable error concealment without the need of any additional actions from the +system. But in some cases its not even possible to know how many decoded PCM +output samples are required to fill the gap due to the data error, then the +software surrounding the decoder must deal with the situation. The most simple +way would be to just stop audio playback and resume once enough bit stream data +and/or buffered output samples are available. More sophisticated designs might +also be able to deal with sender/receiver clock drifts or data drop outs by +using a closed loop control of FIFO fulness levels. The chosen strategy depends +on the final product requirements. + +The error concealment sequence diagram illustrates the general execution paths +for error handling. + +The macro IS_OUTPUT_VALID(err) can be used to identify if the audio output +buffer contains valid audio either from error free bit stream data or successful +error concealment. In case the result is false, the decoder output buffer does +not contain meaningful audio samples and should not be passed to any output as +it is. Most likely in case that a continuous audio output PCM stream is +required, the output buffer must be filled with audio data from the calling +framework. This might be e.g. an appropriate number of samples all zero. + +If error code ::AAC_DEC_TRANSPORT_SYNC_ERROR is returned by the decoder, under +some particular conditions it is possible to estimate lost frames due to the bit +stream error. In that case the bit stream is required to have a constant +bitrate, and compatible transport type. Audio samples for the lost frames can be +obtained by calling aacDecoder_DecodeFrame() with flag ::AACDEC_CONCEAL set +n-times where n is the count of lost frames. Please note that the decoder has to +have encountered valid configuration data at least once to be able to generate +concealed data, because at the minimum the sampling rate, frame size and amount +of audio channels needs to be known. + +If it is not possible to get an estimation of lost frames then a constant +fullness of the audio output buffer can be achieved by implementing different +FIFO control techniques e.g. just stop taking of samples from the buffer to +avoid underflow or stop filling new data to the buffer to avoid overflow. But +this techniques are out of scope of this document. + +For a detailed description of a specific error code please refer also to +::AAC_DECODER_ERROR. + +\section BufferSystem Buffer System + +There are three main buffers in an AAC decoder application. One external input +buffer to hold bitstream data from file I/O or elsewhere, one decoder-internal +input buffer, and one to hold the decoded output PCM sample data. In resource +limited applications, the output buffer may be reused as an external input +buffer prior to the subsequence aacDecoder_Fill() function call. + +The external input buffer is set in the example program and its size is defined +by ::IN_BUF_SIZE. You may freely choose different buffer sizes. To feed the data +to the decoder-internal input buffer, use the function aacDecoder_Fill(). This +function returns important information regarding the number of bytes in the +external input buffer that have not yet been copied into the internal input +buffer (variable bytesValid). Once the external buffer has been fully copied, it +can be completely re-filled again. In case you wish to refill the buffer while +there are unprocessed bytes (bytesValid is unequal 0), you should preserve the +unconsumed data. However, we recommend to refill the buffer only when bytesValid +returns 0. + +The bytesValid parameter is an input and output parameter to the FDK decoder. As +an input, it signals how many valid bytes are available in the external buffer. +After consumption of the external buffer using aacDecoder_Fill() function, the +bytesValid parameter indicates if any of the bytes in the external buffer were +not consumed. + +\image latex dec_buffer.png "Life cycle of the external input buffer" width=9cm + +\page OutputFormat Decoder audio output + +\section OutputFormatObtaining Obtaining channel mapping information + +The decoded audio output format is indicated by a set of variables of the +CStreamInfo structure. While the struct members sampleRate, frameSize and +numChannels might be self explanatory, pChannelType and pChannelIndices require +some further explanation. + +These two arrays indicate the configuration of channel data within the output +buffer. Both arrays have CStreamInfo::numChannels number of cells. Each cell of +pChannelType indicates the channel type, which is described in the enum +::AUDIO_CHANNEL_TYPE (defined in FDK_audio.h). The cells of pChannelIndices +indicate the sub index among the channels starting with 0 among channels of the +same audio channel type. + +The indexing scheme is structured as defined in MPEG-2/4 Standards. Indices +start from the front direction (a center channel if available, will always be +index 0) and increment, starting with the left side, pairwise (e.g. L, R) and +from front to back (Front L, Front R, Surround L, Surround R). For detailed +explanation, please refer to ISO/IEC 13818-7:2005(E), chapter 8.5.3.2. + +In case a Program Config is included in the audio configuration, the channel +mapping described within it will be adopted. + +In case of MPEG-D Surround the channel mapping will follow the same criteria +described in ISO/IEC 13818-7:2005(E), but adding corresponding top channels (if +available) to the channel types in order to avoid ambiguity. The examples below +explain these aspects in detail. + +\section OutputFormatChange Changing the audio output format + +For MPEG-4 audio the channel order can be changed at runtime through the +parameter +::AAC_PCM_OUTPUT_CHANNEL_MAPPING. See the description of those +parameters and the decoder library function aacDecoder_SetParam() for more +detail. + +\section OutputFormatExample Channel mapping examples + +The following examples illustrate the location of individual audio samples in +the audio buffer that is passed to aacDecoder_DecodeFrame() and the expected +data in the CStreamInfo structure which can be obtained by calling +aacDecoder_GetStreamInfo(). + +\subsection ExamplesStereo Stereo + +In case of ::AAC_PCM_OUTPUT_CHANNEL_MAPPING set to 1, +a AAC-LC bit stream which has channelConfiguration = 2 in its audio specific +config would lead to the following values in CStreamInfo: + +CStreamInfo::numChannels = 2 + +CStreamInfo::pChannelType = { ::ACT_FRONT, ::ACT_FRONT } + +CStreamInfo::pChannelIndices = { 0, 1 } + +The output buffer will be formatted as follows: + +\verbatim + <left sample 0> <left sample 1> <left sample 2> ... <left sample N> + <right sample 0> <right sample 1> <right sample 2> ... <right sample N> +\endverbatim + +Where N equals to CStreamInfo::frameSize . + +\subsection ExamplesSurround Surround 5.1 + +In case of ::AAC_PCM_OUTPUT_CHANNEL_MAPPING set to 1, +a AAC-LC bit stream which has channelConfiguration = 6 in its audio specific +config, would lead to the following values in CStreamInfo: + +CStreamInfo::numChannels = 6 + +CStreamInfo::pChannelType = { ::ACT_FRONT, ::ACT_FRONT, ::ACT_FRONT, ::ACT_LFE, +::ACT_BACK, ::ACT_BACK } + +CStreamInfo::pChannelIndices = { 1, 2, 0, 0, 0, 1 } + +Since ::AAC_PCM_OUTPUT_CHANNEL_MAPPING is 1, WAV file channel ordering will be +used. For a 5.1 channel scheme, thus the channels would be: front left, front +right, center, LFE, surround left, surround right. Thus the third channel is the +center channel, receiving the index 0. The other front channels are front left, +front right being placed as first and second channels with indices 1 and 2 +correspondingly. There is only one LFE, placed as the fourth channel and index +0. Finally both surround channels get the type definition ACT_BACK, and the +indices 0 and 1. + +The output buffer will be formatted as follows: + +\verbatim +<front left sample 0> <front right sample 0> +<center sample 0> <LFE sample 0> +<surround left sample 0> <surround right sample 0> + +<front left sample 1> <front right sample 1> +<center sample 1> <LFE sample 1> +<surround left sample 1> <surround right sample 1> + +... + +<front left sample N> <front right sample N> +<center sample N> <LFE sample N> +<surround left sample N> <surround right sample N> +\endverbatim + +Where N equals to CStreamInfo::frameSize . + +\subsection ExamplesArib ARIB coding mode 2/1 + +In case of ::AAC_PCM_OUTPUT_CHANNEL_MAPPING set to 1, +in case of a ARIB bit stream using coding mode 2/1 as described in ARIB STD-B32 +Part 2 Version 2.1-E1, page 61, would lead to the following values in +CStreamInfo: + +CStreamInfo::numChannels = 3 + +CStreamInfo::pChannelType = { ::ACT_FRONT, ::ACT_FRONT, ::ACT_BACK } + +CStreamInfo::pChannelIndices = { 0, 1, 0 } + +The audio channels will be placed as follows in the audio output buffer: + +\verbatim +<front left sample 0> <front right sample 0> <mid surround sample 0> + +<front left sample 1> <front right sample 1> <mid surround sample 1> + +... + +<front left sample N> <front right sample N> <mid surround sample N> + +Where N equals to CStreamInfo::frameSize . + +\endverbatim + +*/ + +#include "machine_type.h" +#include "FDK_audio.h" + +#include "genericStds.h" + +#define AACDECODER_LIB_VL0 3 +#define AACDECODER_LIB_VL1 0 +#define AACDECODER_LIB_VL2 0 + +/** + * \brief AAC decoder error codes. + */ +typedef enum { + AAC_DEC_OK = + 0x0000, /*!< No error occurred. Output buffer is valid and error free. */ + AAC_DEC_OUT_OF_MEMORY = + 0x0002, /*!< Heap returned NULL pointer. Output buffer is invalid. */ + AAC_DEC_UNKNOWN = + 0x0005, /*!< Error condition is of unknown reason, or from a another + module. Output buffer is invalid. */ + + /* Synchronization errors. Output buffer is invalid. */ + aac_dec_sync_error_start = 0x1000, + AAC_DEC_TRANSPORT_SYNC_ERROR = 0x1001, /*!< The transport decoder had + synchronization problems. Do not + exit decoding. Just feed new + bitstream data. */ + AAC_DEC_NOT_ENOUGH_BITS = 0x1002, /*!< The input buffer ran out of bits. */ + aac_dec_sync_error_end = 0x1FFF, + + /* Initialization errors. Output buffer is invalid. */ + aac_dec_init_error_start = 0x2000, + AAC_DEC_INVALID_HANDLE = + 0x2001, /*!< The handle passed to the function call was invalid (NULL). */ + AAC_DEC_UNSUPPORTED_AOT = + 0x2002, /*!< The AOT found in the configuration is not supported. */ + AAC_DEC_UNSUPPORTED_FORMAT = + 0x2003, /*!< The bitstream format is not supported. */ + AAC_DEC_UNSUPPORTED_ER_FORMAT = + 0x2004, /*!< The error resilience tool format is not supported. */ + AAC_DEC_UNSUPPORTED_EPCONFIG = + 0x2005, /*!< The error protection format is not supported. */ + AAC_DEC_UNSUPPORTED_MULTILAYER = + 0x2006, /*!< More than one layer for AAC scalable is not supported. */ + AAC_DEC_UNSUPPORTED_CHANNELCONFIG = + 0x2007, /*!< The channel configuration (either number or arrangement) is + not supported. */ + AAC_DEC_UNSUPPORTED_SAMPLINGRATE = 0x2008, /*!< The sample rate specified in + the configuration is not + supported. */ + AAC_DEC_INVALID_SBR_CONFIG = + 0x2009, /*!< The SBR configuration is not supported. */ + AAC_DEC_SET_PARAM_FAIL = 0x200A, /*!< The parameter could not be set. Either + the value was out of range or the + parameter does not exist. */ + AAC_DEC_NEED_TO_RESTART = 0x200B, /*!< The decoder needs to be restarted, + since the required configuration change + cannot be performed. */ + AAC_DEC_OUTPUT_BUFFER_TOO_SMALL = + 0x200C, /*!< The provided output buffer is too small. */ + aac_dec_init_error_end = 0x2FFF, + + /* Decode errors. Output buffer is valid but concealed. */ + aac_dec_decode_error_start = 0x4000, + AAC_DEC_TRANSPORT_ERROR = + 0x4001, /*!< The transport decoder encountered an unexpected error. */ + AAC_DEC_PARSE_ERROR = 0x4002, /*!< Error while parsing the bitstream. Most + probably it is corrupted, or the system + crashed. */ + AAC_DEC_UNSUPPORTED_EXTENSION_PAYLOAD = + 0x4003, /*!< Error while parsing the extension payload of the bitstream. + The extension payload type found is not supported. */ + AAC_DEC_DECODE_FRAME_ERROR = 0x4004, /*!< The parsed bitstream value is out of + range. Most probably the bitstream is + corrupt, or the system crashed. */ + AAC_DEC_CRC_ERROR = 0x4005, /*!< The embedded CRC did not match. */ + AAC_DEC_INVALID_CODE_BOOK = 0x4006, /*!< An invalid codebook was signaled. + Most probably the bitstream is corrupt, + or the system crashed. */ + AAC_DEC_UNSUPPORTED_PREDICTION = + 0x4007, /*!< Predictor found, but not supported in the AAC Low Complexity + profile. Most probably the bitstream is corrupt, or has a wrong + format. */ + AAC_DEC_UNSUPPORTED_CCE = 0x4008, /*!< A CCE element was found which is not + supported. Most probably the bitstream is + corrupt, or has a wrong format. */ + AAC_DEC_UNSUPPORTED_LFE = 0x4009, /*!< A LFE element was found which is not + supported. Most probably the bitstream is + corrupt, or has a wrong format. */ + AAC_DEC_UNSUPPORTED_GAIN_CONTROL_DATA = + 0x400A, /*!< Gain control data found but not supported. Most probably the + bitstream is corrupt, or has a wrong format. */ + AAC_DEC_UNSUPPORTED_SBA = + 0x400B, /*!< SBA found, but currently not supported in the BSAC profile. + */ + AAC_DEC_TNS_READ_ERROR = 0x400C, /*!< Error while reading TNS data. Most + probably the bitstream is corrupt or the + system crashed. */ + AAC_DEC_RVLC_ERROR = + 0x400D, /*!< Error while decoding error resilient data. */ + aac_dec_decode_error_end = 0x4FFF, + /* Ancillary data errors. Output buffer is valid. */ + aac_dec_anc_data_error_start = 0x8000, + AAC_DEC_ANC_DATA_ERROR = + 0x8001, /*!< Non severe error concerning the ancillary data handling. */ + AAC_DEC_TOO_SMALL_ANC_BUFFER = 0x8002, /*!< The registered ancillary data + buffer is too small to receive the + parsed data. */ + AAC_DEC_TOO_MANY_ANC_ELEMENTS = 0x8003, /*!< More than the allowed number of + ancillary data elements should be + written to buffer. */ + aac_dec_anc_data_error_end = 0x8FFF + +} AAC_DECODER_ERROR; + +/** Macro to identify initialization errors. Output buffer is invalid. */ +#define IS_INIT_ERROR(err) \ + ((((err) >= aac_dec_init_error_start) && ((err) <= aac_dec_init_error_end)) \ + ? 1 \ + : 0) +/** Macro to identify decode errors. Output buffer is valid but concealed. */ +#define IS_DECODE_ERROR(err) \ + ((((err) >= aac_dec_decode_error_start) && \ + ((err) <= aac_dec_decode_error_end)) \ + ? 1 \ + : 0) +/** + * Macro to identify if the audio output buffer contains valid samples after + * calling aacDecoder_DecodeFrame(). Output buffer is valid but can be + * concealed. + */ +#define IS_OUTPUT_VALID(err) (((err) == AAC_DEC_OK) || IS_DECODE_ERROR(err)) + +/*! \enum AAC_MD_PROFILE + * \brief The available metadata profiles which are mostly related to downmixing. The values define the arguments + * for the use with parameter ::AAC_METADATA_PROFILE. + */ +typedef enum { + AAC_MD_PROFILE_MPEG_STANDARD = + 0, /*!< The standard profile creates a mixdown signal based on the + advanced downmix metadata (from a DSE). The equations and default + values are defined in ISO/IEC 14496:3 Ammendment 4. Any other + (legacy) downmix metadata will be ignored. No other parameter will + be modified. */ + AAC_MD_PROFILE_MPEG_LEGACY = + 1, /*!< This profile behaves identical to the standard profile if advanced + downmix metadata (from a DSE) is available. If not, the + matrix_mixdown information embedded in the program configuration + element (PCE) will be applied. If neither is the case, the module + creates a mixdown using the default coefficients as defined in + ISO/IEC 14496:3 AMD 4. The profile can be used to support legacy + digital TV (e.g. DVB) streams. */ + AAC_MD_PROFILE_MPEG_LEGACY_PRIO = + 2, /*!< Similar to the ::AAC_MD_PROFILE_MPEG_LEGACY profile but if both + the advanced (ISO/IEC 14496:3 AMD 4) and the legacy (PCE) MPEG + downmix metadata are available the latter will be applied. + */ + AAC_MD_PROFILE_ARIB_JAPAN = + 3 /*!< Downmix creation as described in ABNT NBR 15602-2. But if advanced + downmix metadata (ISO/IEC 14496:3 AMD 4) is available it will be + preferred because of the higher resolutions. In addition the + metadata expiry time will be set to the value defined in the ARIB + standard (see ::AAC_METADATA_EXPIRY_TIME). + */ +} AAC_MD_PROFILE; + +/*! \enum AAC_DRC_DEFAULT_PRESENTATION_MODE_OPTIONS + * \brief Options for handling of DRC parameters, if presentation mode is not indicated in bitstream + */ +typedef enum { + AAC_DRC_PARAMETER_HANDLING_DISABLED = -1, /*!< DRC parameter handling + disabled, all parameters are + applied as requested. */ + AAC_DRC_PARAMETER_HANDLING_ENABLED = + 0, /*!< Apply changes to requested DRC parameters to prevent clipping. */ + AAC_DRC_PRESENTATION_MODE_1_DEFAULT = + 1, /*!< Use DRC presentation mode 1 as default (e.g. for Nordig) */ + AAC_DRC_PRESENTATION_MODE_2_DEFAULT = + 2 /*!< Use DRC presentation mode 2 as default (e.g. for DTG DBook) */ +} AAC_DRC_DEFAULT_PRESENTATION_MODE_OPTIONS; + +/** + * \brief AAC decoder setting parameters + */ +typedef enum { + AAC_PCM_DUAL_CHANNEL_OUTPUT_MODE = + 0x0002, /*!< Defines how the decoder processes two channel signals: \n + 0: Leave both signals as they are (default). \n + 1: Create a dual mono output signal from channel 1. \n + 2: Create a dual mono output signal from channel 2. \n + 3: Create a dual mono output signal by mixing both channels + (L' = R' = 0.5*Ch1 + 0.5*Ch2). */ + AAC_PCM_OUTPUT_CHANNEL_MAPPING = + 0x0003, /*!< Output buffer channel ordering. 0: MPEG PCE style order, 1: + WAV file channel order (default). */ + AAC_PCM_LIMITER_ENABLE = + 0x0004, /*!< Enable signal level limiting. \n + -1: Auto-config. Enable limiter for all + non-lowdelay configurations by default. \n + 0: Disable limiter in general. \n + 1: Enable limiter always. + It is recommended to call the decoder + with a AACDEC_CLRHIST flag to reset all + states when the limiter switch is changed + explicitly. */ + AAC_PCM_LIMITER_ATTACK_TIME = 0x0005, /*!< Signal level limiting attack time + in ms. Default configuration is 15 + ms. Adjustable range from 1 ms to 15 + ms. */ + AAC_PCM_LIMITER_RELEAS_TIME = 0x0006, /*!< Signal level limiting release time + in ms. Default configuration is 50 + ms. Adjustable time must be larger + than 0 ms. */ + AAC_PCM_MIN_OUTPUT_CHANNELS = + 0x0011, /*!< Minimum number of PCM output channels. If higher than the + number of encoded audio channels, a simple channel extension is + applied (see note 4 for exceptions). \n -1, 0: Disable channel + extension feature. The decoder output contains the same number + of channels as the encoded bitstream. \n 1: This value is + currently needed only together with the mix-down feature. See + ::AAC_PCM_MAX_OUTPUT_CHANNELS and note 2 below. \n + 2: Encoded mono signals will be duplicated to achieve a + 2/0/0.0 channel output configuration. \n 6: The decoder + tries to reorder encoded signals with less than six channels to + achieve a 3/0/2.1 channel output signal. Missing channels will + be filled with a zero signal. If reordering is not possible the + empty channels will simply be appended. Only available if + instance is configured to support multichannel output. \n 8: + The decoder tries to reorder encoded signals with less than + eight channels to achieve a 3/0/4.1 channel output signal. + Missing channels will be filled with a zero signal. If + reordering is not possible the empty channels will simply be + appended. Only available if instance is configured to + support multichannel output.\n NOTE: \n + 1. The channel signaling (CStreamInfo::pChannelType and + CStreamInfo::pChannelIndices) will not be modified. Added empty + channels will be signaled with channel type + AUDIO_CHANNEL_TYPE::ACT_NONE. \n + 2. If the parameter value is greater than that of + ::AAC_PCM_MAX_OUTPUT_CHANNELS both will be set to the same + value. \n + 3. This parameter does not affect MPEG Surround processing. + \n + 4. This parameter will be ignored if the number of encoded + audio channels is greater than 8. */ + AAC_PCM_MAX_OUTPUT_CHANNELS = + 0x0012, /*!< Maximum number of PCM output channels. If lower than the + number of encoded audio channels, downmixing is applied + accordingly (see note 5 for exceptions). If dedicated metadata + is available in the stream it will be used to achieve better + mixing results. \n -1, 0: Disable downmixing feature. The + decoder output contains the same number of channels as the + encoded bitstream. \n 1: All encoded audio configurations + with more than one channel will be mixed down to one mono + output signal. \n 2: The decoder performs a stereo mix-down + if the number encoded audio channels is greater than two. \n 6: + If the number of encoded audio channels is greater than six the + decoder performs a mix-down to meet the target output + configuration of 3/0/2.1 channels. Only available if instance + is configured to support multichannel output. \n 8: This + value is currently needed only together with the channel + extension feature. See ::AAC_PCM_MIN_OUTPUT_CHANNELS and note 2 + below. Only available if instance is configured to support + multichannel output. \n NOTE: \n + 1. Down-mixing of any seven or eight channel configuration + not defined in ISO/IEC 14496-3 PDAM 4 is not supported by this + software version. \n + 2. If the parameter value is greater than zero but smaller + than ::AAC_PCM_MIN_OUTPUT_CHANNELS both will be set to same + value. \n + 3. The operating mode of the MPEG Surround module will be + set accordingly. \n + 4. Setting this parameter with any value will disable the + binaural processing of the MPEG Surround module + 5. This parameter will be ignored if the number of encoded + audio channels is greater than 8. */ + AAC_METADATA_PROFILE = + 0x0020, /*!< See ::AAC_MD_PROFILE for all available values. */ + AAC_METADATA_EXPIRY_TIME = 0x0021, /*!< Defines the time in ms after which all + the bitstream associated meta-data (DRC, + downmix coefficients, ...) will be reset + to default if no update has been + received. Negative values disable the + feature. */ + + AAC_CONCEAL_METHOD = 0x0100, /*!< Error concealment: Processing method. \n + 0: Spectral muting. \n + 1: Noise substitution (see ::CONCEAL_NOISE). + \n 2: Energy interpolation (adds additional + signal delay of one frame, see + ::CONCEAL_INTER. only some AOTs are + supported). \n */ + AAC_DRC_BOOST_FACTOR = + 0x0200, /*!< Dynamic Range Control: Scaling factor for boosting gain + values. Defines how the boosting DRC factors (conveyed in the + bitstream) will be applied to the decoded signal. The valid + values range from 0 (don't apply boost factors) to 127 (fully + apply boost factors). Default value is 0. */ + AAC_DRC_ATTENUATION_FACTOR = + 0x0201, /*!< Dynamic Range Control: Scaling factor for attenuating gain + values. Same as + ::AAC_DRC_BOOST_FACTOR but for attenuating DRC factors. */ + AAC_DRC_REFERENCE_LEVEL = + 0x0202, /*!< Dynamic Range Control (DRC): Target reference level. Defines + the level below full-scale (quantized in steps of 0.25dB) to + which the output audio signal will be normalized to by the DRC + module. The parameter controls loudness normalization for both + MPEG-4 DRC and MPEG-D DRC. The valid values range from 40 (-10 + dBFS) to 127 (-31.75 dBFS). Any value smaller than 0 switches + off loudness normalization and MPEG-4 DRC. By default, loudness + normalization and MPEG-4 DRC is switched off. */ + AAC_DRC_HEAVY_COMPRESSION = + 0x0203, /*!< Dynamic Range Control: En-/Disable DVB specific heavy + compression (aka RF mode). If set to 1, the decoder will apply + the compression values from the DVB specific ancillary data + field. At the same time the MPEG-4 Dynamic Range Control tool + will be disabled. By default, heavy compression is disabled. */ + AAC_DRC_DEFAULT_PRESENTATION_MODE = + 0x0204, /*!< Dynamic Range Control: Default presentation mode (DRC + parameter handling). \n Defines the handling of the DRC + parameters boost factor, attenuation factor and heavy + compression, if no presentation mode is indicated in the + bitstream.\n For options, see + ::AAC_DRC_DEFAULT_PRESENTATION_MODE_OPTIONS.\n Default: + ::AAC_DRC_PARAMETER_HANDLING_DISABLED */ + AAC_DRC_ENC_TARGET_LEVEL = + 0x0205, /*!< Dynamic Range Control: Encoder target level for light (i.e. + not heavy) compression.\n If known, this declares the target + reference level that was assumed at the encoder for calculation + of limiting gains. The valid values range from 0 (full-scale) + to 127 (31.75 dB below full-scale). This parameter is used only + with ::AAC_DRC_PARAMETER_HANDLING_ENABLED and ignored + otherwise.\n Default: 127 (worst-case assumption).\n */ + AAC_QMF_LOWPOWER = 0x0300, /*!< Quadrature Mirror Filter (QMF) Bank processing + mode. \n -1: Use internal default. Implies MPEG + Surround partially complex accordingly. \n 0: + Use complex QMF data mode. \n 1: Use real (low + power) QMF data mode. \n */ + AAC_TPDEC_CLEAR_BUFFER = + 0x0603, /*!< Clear internal bit stream buffer of transport layers. The + decoder will start decoding at new data passed after this event + and any previous data is discarded. */ + AAC_UNIDRC_SET_EFFECT = 0x0903 /*!< MPEG-D DRC: Request a DRC effect type for + selection of a DRC set.\n Supported indices + are:\n -1: DRC off. Completely disables + MPEG-D DRC.\n 0: None (default). Disables + MPEG-D DRC, but automatically enables DRC if + necessary to prevent clipping.\n 1: Late + night\n 2: Noisy environment\n 3: Limited + playback range\n 4: Low playback level\n 5: + Dialog enhancement\n 6: General compression. + Used for generally enabling MPEG-D DRC + without particular request.\n */ + +} AACDEC_PARAM; + +/** + * \brief This structure gives information about the currently decoded audio + * data. All fields are read-only. + */ +typedef struct { + /* These five members are the only really relevant ones for the user. */ + INT sampleRate; /*!< The sample rate in Hz of the decoded PCM audio signal. */ + INT frameSize; /*!< The frame size of the decoded PCM audio signal. \n + Typically this is: \n + 1024 or 960 for AAC-LC \n + 2048 or 1920 for HE-AAC (v2) \n + 512 or 480 for AAC-LD and AAC-ELD \n + 768, 1024, 2048 or 4096 for USAC */ + INT numChannels; /*!< The number of output audio channels before the rendering + module, i.e. the original channel configuration. */ + AUDIO_CHANNEL_TYPE + *pChannelType; /*!< Audio channel type of each output audio channel. */ + UCHAR *pChannelIndices; /*!< Audio channel index for each output audio + channel. See ISO/IEC 13818-7:2005(E), 8.5.3.2 + Explicit channel mapping using a + program_config_element() */ + /* Decoder internal members. */ + INT aacSampleRate; /*!< Sampling rate in Hz without SBR (from configuration + info) divided by a (ELD) downscale factor if present. */ + INT profile; /*!< MPEG-2 profile (from file header) (-1: not applicable (e. g. + MPEG-4)). */ + AUDIO_OBJECT_TYPE + aot; /*!< Audio Object Type (from ASC): is set to the appropriate value + for MPEG-2 bitstreams (e. g. 2 for AAC-LC). */ + INT channelConfig; /*!< Channel configuration (0: PCE defined, 1: mono, 2: + stereo, ... */ + INT bitRate; /*!< Instantaneous bit rate. */ + INT aacSamplesPerFrame; /*!< Samples per frame for the AAC core (from ASC) + divided by a (ELD) downscale factor if present. \n + Typically this is (with a downscale factor of 1): + \n 1024 or 960 for AAC-LC \n 512 or 480 for + AAC-LD and AAC-ELD */ + INT aacNumChannels; /*!< The number of audio channels after AAC core + processing (before PS or MPS processing). CAUTION: This + are not the final number of output channels! */ + AUDIO_OBJECT_TYPE extAot; /*!< Extension Audio Object Type (from ASC) */ + INT extSamplingRate; /*!< Extension sampling rate in Hz (from ASC) divided by + a (ELD) downscale factor if present. */ + + UINT outputDelay; /*!< The number of samples the output is additionally + delayed by.the decoder. */ + UINT flags; /*!< Copy of internal flags. Only to be written by the decoder, + and only to be read externally. */ + + SCHAR epConfig; /*!< epConfig level (from ASC): only level 0 supported, -1 + means no ER (e. g. AOT=2, MPEG-2 AAC, etc.) */ + /* Statistics */ + INT numLostAccessUnits; /*!< This integer will reflect the estimated amount of + lost access units in case aacDecoder_DecodeFrame() + returns AAC_DEC_TRANSPORT_SYNC_ERROR. It will be + < 0 if the estimation failed. */ + + INT64 numTotalBytes; /*!< This is the number of total bytes that have passed + through the decoder. */ + INT64 + numBadBytes; /*!< This is the number of total bytes that were considered + with errors from numTotalBytes. */ + INT64 + numTotalAccessUnits; /*!< This is the number of total access units that + have passed through the decoder. */ + INT64 numBadAccessUnits; /*!< This is the number of total access units that + were considered with errors from numTotalBytes. */ + + /* Metadata */ + SCHAR drcProgRefLev; /*!< DRC program reference level. Defines the reference + level below full-scale. It is quantized in steps of + 0.25dB. The valid values range from 0 (0 dBFS) to 127 + (-31.75 dBFS). It is used to reflect the average + loudness of the audio in LKFS according to ITU-R BS + 1770. If no level has been found in the bitstream the + value is -1. */ + SCHAR + drcPresMode; /*!< DRC presentation mode. According to ETSI TS 101 154, + this field indicates whether light (MPEG-4 Dynamic Range + Control tool) or heavy compression (DVB heavy + compression) dynamic range control shall take priority + on the outputs. For details, see ETSI TS 101 154, table + C.33. Possible values are: \n -1: No corresponding + metadata found in the bitstream \n 0: DRC presentation + mode not indicated \n 1: DRC presentation mode 1 \n 2: + DRC presentation mode 2 \n 3: Reserved */ + +} CStreamInfo; + +typedef struct AAC_DECODER_INSTANCE + *HANDLE_AACDECODER; /*!< Pointer to a AAC decoder instance. */ + +#ifdef __cplusplus +extern "C" { +#endif + +/** + * \brief Initialize ancillary data buffer. + * + * \param self AAC decoder handle. + * \param buffer Pointer to (external) ancillary data buffer. + * \param size Size of the buffer pointed to by buffer. + * \return Error code. + */ +LINKSPEC_H AAC_DECODER_ERROR aacDecoder_AncDataInit(HANDLE_AACDECODER self, + UCHAR *buffer, int size); + +/** + * \brief Get one ancillary data element. + * + * \param self AAC decoder handle. + * \param index Index of the ancillary data element to get. + * \param ptr Pointer to a buffer receiving a pointer to the requested + * ancillary data element. + * \param size Pointer to a buffer receiving the length of the requested + * ancillary data element. + * \return Error code. + */ +LINKSPEC_H AAC_DECODER_ERROR aacDecoder_AncDataGet(HANDLE_AACDECODER self, + int index, UCHAR **ptr, + int *size); + +/** + * \brief Set one single decoder parameter. + * + * \param self AAC decoder handle. + * \param param Parameter to be set. + * \param value Parameter value. + * \return Error code. + */ +LINKSPEC_H AAC_DECODER_ERROR aacDecoder_SetParam(const HANDLE_AACDECODER self, + const AACDEC_PARAM param, + const INT value); + +/** + * \brief Get free bytes inside decoder internal buffer. + * \param self Handle of AAC decoder instance. + * \param pFreeBytes Pointer to variable receiving amount of free bytes inside + * decoder internal buffer. + * \return Error code. + */ +LINKSPEC_H AAC_DECODER_ERROR +aacDecoder_GetFreeBytes(const HANDLE_AACDECODER self, UINT *pFreeBytes); + +/** + * \brief Open an AAC decoder instance. + * \param transportFmt The transport type to be used. + * \param nrOfLayers Number of transport layers. + * \return AAC decoder handle. + */ +LINKSPEC_H HANDLE_AACDECODER aacDecoder_Open(TRANSPORT_TYPE transportFmt, + UINT nrOfLayers); + +/** + * \brief Explicitly configure the decoder by passing a raw AudioSpecificConfig + * (ASC) or a StreamMuxConfig (SMC), contained in a binary buffer. This is + * required for MPEG-4 and Raw Packets file format bitstreams as well as for + * LATM bitstreams with no in-band SMC. If the transport format is LATM with or + * without LOAS, configuration is assumed to be an SMC, for all other file + * formats an ASC. + * + * \param self AAC decoder handle. + * \param conf Pointer to an unsigned char buffer containing the binary + * configuration buffer (either ASC or SMC). + * \param length Length of the configuration buffer in bytes. + * \return Error code. + */ +LINKSPEC_H AAC_DECODER_ERROR aacDecoder_ConfigRaw(HANDLE_AACDECODER self, + UCHAR *conf[], + const UINT length[]); + +/** + * \brief Submit raw ISO base media file format boxes to decoder for parsing + * (only some box types are recognized). + * + * \param self AAC decoder handle. + * \param buffer Pointer to an unsigned char buffer containing the binary box + * data (including size and type, can be a sequence of multiple boxes). + * \param length Length of the data in bytes. + * \return Error code. + */ +LINKSPEC_H AAC_DECODER_ERROR aacDecoder_RawISOBMFFData(HANDLE_AACDECODER self, + UCHAR *buffer, + UINT length); + +/** + * \brief Fill AAC decoder's internal input buffer with bitstream data from the + * external input buffer. The function only copies such data as long as the + * decoder-internal input buffer is not full. So it grabs whatever it can from + * pBuffer and returns information (bytesValid) so that at a subsequent call of + * %aacDecoder_Fill(), the right position in pBuffer can be determined to grab + * the next data. + * + * \param self AAC decoder handle. + * \param pBuffer Pointer to external input buffer. + * \param bufferSize Size of external input buffer. This argument is required + * because decoder-internally we need the information to calculate the offset to + * pBuffer, where the next available data is, which is then + * fed into the decoder-internal buffer (as much as + * possible). Our example framework implementation fills the + * buffer at pBuffer again, once it contains no available valid bytes anymore + * (meaning bytesValid equal 0). + * \param bytesValid Number of bitstream bytes in the external bitstream buffer + * that have not yet been copied into the decoder's internal bitstream buffer by + * calling this function. The value is updated according to + * the amount of newly copied bytes. + * \return Error code. + */ +LINKSPEC_H AAC_DECODER_ERROR aacDecoder_Fill(HANDLE_AACDECODER self, + UCHAR *pBuffer[], + const UINT bufferSize[], + UINT *bytesValid); + +#define AACDEC_CONCEAL \ + 1 /*!< Flag for aacDecoder_DecodeFrame(): Trigger the built-in error \ + concealment module to generate a substitute signal for one lost frame. \ + New input data will not be considered. */ +#define AACDEC_FLUSH \ + 2 /*!< Flag for aacDecoder_DecodeFrame(): Flush all filterbanks to get all \ + delayed audio without having new input data. Thus new input data will \ + not be considered.*/ +#define AACDEC_INTR \ + 4 /*!< Flag for aacDecoder_DecodeFrame(): Signal an input bit stream data \ + discontinuity. Resync any internals as necessary. */ +#define AACDEC_CLRHIST \ + 8 /*!< Flag for aacDecoder_DecodeFrame(): Clear all signal delay lines and \ + history buffers. CAUTION: This can cause discontinuities in the output \ + signal. */ + +/** + * \brief Decode one audio frame + * + * \param self AAC decoder handle. + * \param pTimeData Pointer to external output buffer where the decoded PCM + * samples will be stored into. + * \param timeDataSize Size of external output buffer. + * \param flags Bit field with flags for the decoder: \n + * (flags & AACDEC_CONCEAL) == 1: Do concealment. \n + * (flags & AACDEC_FLUSH) == 2: Discard input data. Flush + * filter banks (output delayed audio). \n (flags & AACDEC_INTR) == 4: Input + * data is discontinuous. Resynchronize any internals as + * necessary. \n (flags & AACDEC_CLRHIST) == 8: Clear all signal delay lines and + * history buffers. + * \return Error code. + */ +LINKSPEC_H AAC_DECODER_ERROR aacDecoder_DecodeFrame(HANDLE_AACDECODER self, + INT_PCM *pTimeData, + const INT timeDataSize, + const UINT flags); + +/** + * \brief De-allocate all resources of an AAC decoder instance. + * + * \param self AAC decoder handle. + * \return void. + */ +LINKSPEC_H void aacDecoder_Close(HANDLE_AACDECODER self); + +/** + * \brief Get CStreamInfo handle from decoder. + * + * \param self AAC decoder handle. + * \return Reference to requested CStreamInfo. + */ +LINKSPEC_H CStreamInfo *aacDecoder_GetStreamInfo(HANDLE_AACDECODER self); + +/** + * \brief Get decoder library info. + * + * \param info Pointer to an allocated LIB_INFO structure. + * \return 0 on success. + */ +LINKSPEC_H INT aacDecoder_GetLibInfo(LIB_INFO *info); + +#ifdef __cplusplus +} +#endif + +#endif /* AACDECODER_LIB_H */ |