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/*
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* Copyright (c) 2007 Nokia Corporation and/or its subsidiary(-ies).
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* All rights reserved.
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* This component and the accompanying materials are made available
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* under the terms of "Eclipse Public License v1.0"
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* which accompanies this distribution, and is available
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* at the URL "http://www.eclipse.org/legal/epl-v10.html".
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*
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* Initial Contributors:
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* Nokia Corporation - initial contribution.
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*
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* Contributors:
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*
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* Description: Header file for EAacPlusUtil.cpp
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*
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*/
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#ifndef EAACPLUSUTIL_H
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#define EAACPLUSUTIL_H
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// INCLUDES
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#include <e32base.h>
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// CLASS DECLARATION
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class EAacpAudioFrameInfo;
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/**
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* This class implements utility functions to extract AAC frame
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* information.
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*
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* @lib MmfEAacPlusUtil.lib
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* @since 3.2
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*/
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class CEAacPlusUtil : public CBase
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{
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public:
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// CONSTANTS
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enum TEAacPlusFormatType
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{
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EAacPlusFormatRaw=0,
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EAacPlusFormatAdif=1,
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EAacPlusFormatAdts=2
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};
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/**
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* EAAC+ frame info struct.
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*
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* @lib MmfEAacPlusUtil.lib
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* @since 3.2
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*/
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class TEAacPlusFrameInfo
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{
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public:
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TInt iOutFrameSize; // Size of PCM Samples generated by decoder
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TInt iNoOfSamples; // Number of PCM Samples generated by decoder per frame
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TInt iSamplingFrequency; // Sampling freq of AAC Code decoder
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TInt iNoOfChannels; // No of output channel 1=Mono; 2=Stereo
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TInt iObjectType; // MPEG Audio Object Type 2=AAC-LC; 4=AAC-LTP
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TInt iOutSamplingFrequency; // Sampling Frequence for the output samples
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TInt iDownSampledMode; // 0=Normal Mode; 1=Down Sampled mode
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TInt iSbr; // 0=SBR not present; 1=SBR present
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TInt iPs; // 0=PS not present; 1=PS present
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};
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class TEAacPlusFrameLenConfig
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{
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public:
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TEAacPlusFormatType iFormatType; // Container type.
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TInt iSamplingFrequency; // Sampling freq of AAC core decoder
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TInt iObjectType; // MPEG Audio Object Type 2=AAC-LC; 4=AAC-LTP
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};
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public: // Constructors and destructor
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/**
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* Two-phased constructor.
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*/
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IMPORT_C static CEAacPlusUtil* NewL();
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/**
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* Destructor.
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*/
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IMPORT_C virtual ~CEAacPlusUtil();
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public: // New functions
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/**
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* Used to get the format type.
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* @since 3.2
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* @param aBuf buffer of AAC data from start of aac content
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* @param aBufLen length of aBuf
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* @param TEAacPlusFormatType returned format type 0=raw; 1=ADIF; 2=ADTS
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* @return status
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*/
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IMPORT_C TInt GetAacFormatType(const TUint8* aBuf, TInt aBufLen, TEAacPlusFormatType& aFormatType);
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/**
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* Used to get the audio format information for ADIF and ADTS content.
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* Data should be provided beginning with start of aac content including header.
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* Enough data should follow the header to determine SBR and PS if needed.
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* Can be used with mpeg data where aHdrBuf will contain the AudioSpecificConfig. Implicit SBR and PS
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* will not be determined.
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* @since 3.2
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* @param aHdrBuf buffer with AAC data beginning at start of aac content including ADIF or ADTS header
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* @param aHdrLen length of aHdrBuf; header length is returned in this parameter
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* @param aFrameInfo returns the format information
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* @return status
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*/
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IMPORT_C TInt GetAacFrameInfo (const TUint8* aHdrBuf, TInt& aHdrLen, TEAacPlusFrameInfo& aFrameInfo);
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/**
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* Used to get the audio format information for mpeg aac.
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* aHdrBuf will contain the AudioSpecificConfig. aDataBuf will contain data at beginning of raw audio frames.
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* Implicit SBR and PS can be determined.
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* @since 3.2
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* @param aHdrBuf buffer with AudioSpecificConfig data.
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* @param aHdrLen length of aHdrBuf
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* @param aFrameInfo returns the format information
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* @param aDataBuf buffer with raw audio frames
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* @param aDataBufLen length of aDataBuf
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* @return status
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*/
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IMPORT_C TInt GetAacFrameInfo (const TUint8* aHdrBuf, TInt& aHdrLen, TEAacPlusFrameInfo& aFrameInfo,
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TUint8* aDataBuf, TInt aDataBufLen);
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/**
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* Used to get the size in bytes of the frame found at the start of aBuf.
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* @since 3.2
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* @param aBuf buffer with AAC data frame
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* @param aBufLen length of aBuf
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* @param aFrameLen returns the frame size in bytes
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* @return status
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*/
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IMPORT_C TInt GetAacFrameLength(const TUint8* aBuf, TInt aBufLen, TInt& aFrameLen);
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/**
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* Used to configure the utility with information needed to enable the apis.
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* This api can be used if GetAacFrameInfo is not used to initialize the utility.
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* @since 3.2
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* @param aFormatType format type
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* @param aSamplingFrequency sampling frequency
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* @return status
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*/
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IMPORT_C TInt Config(TEAacPlusFrameLenConfig& aFrameLenConfig);
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private:
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/**
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* C++ default constructor.
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*/
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CEAacPlusUtil();
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/**
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* By default Symbian 2nd phase constructor is private.
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*/
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void ConstructL();
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private: // Data
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TEAacPlusFormatType iFormat;
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EAacpAudioFrameInfo* iGetFrameLenParam;
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TBool iInitialized;
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};
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#endif // EAACPLUSUTIL_H
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// End of File
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