author | Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com> |
Tue, 02 Feb 2010 01:04:58 +0200 | |
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permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2004-2006 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: Formatter classes for decoding of RTP payload format |
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* for AMR ( narrow band ) and AMR-WB ( wide band ) audio codecs. |
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* |
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*/ |
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#ifndef AMRPAYLOADENCODER_H |
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#define AMRPAYLOADENCODER_H |
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// INCLUDES |
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#include <e32std.h> |
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#include "amrpayloadformatter.h" |
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#include "amrpayloadheader.h" |
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#include "amrtocentry.h" |
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#include "streamformatter.h" |
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// CONSTANTS |
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// MACROS |
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// DATA TYPES |
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// FUNCTION PROTOTYPES |
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// FORWARD DECLARATIONS |
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class TStreamEncoder; |
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// CLASS DECLARATION |
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/** |
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* The AMR payload encoder for bandwidth efficient mode. |
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* |
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* @lib <TBD> |
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* @since Series-60 2.1 |
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*/ |
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class CAmrPayloadEncoder : public CAmrPayloadFormatter |
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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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static CAmrPayloadEncoder* NewL( TBool aIsNb ); |
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/** |
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* Destructor. |
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*/ |
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virtual ~CAmrPayloadEncoder( ); |
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public: // Functions |
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/** |
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* Set AMR codec mode request ( CMR ). |
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* @since Series-60 2.1 |
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* @param aRequest - [input] AMR codec mode request ( CMR ) |
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* @return void |
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*/ |
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void SetModeRequest( TAmrModeRequest aRequest ); |
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/** |
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* Encode a received AMR frame into the payload buffer. |
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* @since Series-60 2.1 |
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* @param aChannel - [input] Channel number that the frame belongs to |
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* @param aFrameType - [input] Frame type |
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* @param aFrameQualityInd - [input] Frame quality indicator bit; 1 if frame OK; 0 if frame damaged |
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* @param aFrameData - [input] Frame data; its length depends on frame type |
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* @return ETrue if payload formatting is completed; otherwise EFalse |
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*/ |
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virtual TBool EncodeFrame( TInt aChannel, |
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TAmrFrameType aFrameType, |
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TUint8 aFrameQualityInd, |
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const TDes8& aFrameData ); |
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/** |
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* Reset the payload buffer. |
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* @since Series-60 2.1 |
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* @param None |
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* @return void |
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*/ |
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void ResetPayloadBuffer( ); |
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/** |
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* Do bit shifting when AmrPayloadFormatPlugin is doing buffer flushing. |
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* @since Series-60 2.1 |
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* @param None |
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* @return ETrue if payload formatting is completed; otherwise EFalse |
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*/ |
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TBool ReEncodeFrameL( ); |
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/** |
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* Do bit shifting when AmrPayloadFormatPlugin is doing buffer flushing |
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* @since Series-60 2.1 |
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* @param aBuffer Buffer containing frame data |
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* @return ETrue if payload formatting is completed; otherwise EFalse |
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*/ |
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TBool ReEncodeFrameL( TUint8* aBuffer ); |
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/** |
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* Returns ETrue if next frame will start new packetization period. |
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* @since Series 60 3.1 |
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* @return ETrue if next frame starts new period |
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*/ |
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TBool IsStartOfPeriod(); |
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public: // Functions from CAmrPayloadFormatter |
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/** |
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* Set number of audio channels. |
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* @since Series-60 2.1 |
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* @param aChannelCount - [input] Number of audio channels |
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* @return KErrNone if successful; system wide error code otherwise |
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*/ |
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virtual TInt SetChannelCount( TInt aChannelCount ); |
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|
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/** |
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* Set number of AMR frame blocks included in one RTP packet. |
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* Each frame block contains frames for all audio channels. |
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* @since Series-60 2.1 |
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* @param aFrameblockCount - [input] Number of AMR frame blocks included |
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* in one RTP packet |
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* @return KErrNone if successful; system wide error code otherwise |
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*/ |
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virtual TInt SetFrameBlockCount( TInt aFrameblockCount ); |
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|
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/** |
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* Set number of redundant frame blocks included in one RTP packet. |
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* Each frame block contains frames for all audio channels. |
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* @since Series 60 3.0 |
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* @param aRedBlockCount Number of redundant AMR frame blocks to be |
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* included in one RTP packet |
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* @return KErrNone if successful; system wide error code otherwise |
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*/ |
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virtual TInt SetRedFrameBlockCount( TInt aRedBlockCount ); |
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|
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/** |
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* Initialize frame encoder ( Stream Encoder ). |
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* Information to initialize are obtained from iPayload, calculation |
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* using iChannelCount and iFrameBlockCount. |
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* Initialization should be done whenever a payload is finished. |
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* @since Series-60 2.1 |
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* @param None |
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* @return void |
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*/ |
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virtual void InitializeFrameEncoder( ); |
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|
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protected: // Functions |
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|
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/** |
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* Constructor. |
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*/ |
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CAmrPayloadEncoder( TBool aIsNb ); |
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|
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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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|
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/** |
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* Encode the AMR payload ( for one RTP packet ) into a given buffer. |
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* Values to encode are obtained from `iFrames' array. |
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* @since Series-60 2.1 |
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* @param aBuffer - [output] Buffer to store encoded data |
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* @return Total number of bytes encoded in the buffer |
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*/ |
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TInt Encode( TUint8* aBuffer ); |
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|
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/** |
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* Encode 'Table of Contents' into a given buffer at the given position. |
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* Information to encode are obtained from `iFrames' array. |
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* Byte and bit positions are updated after encoding is done. |
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* @since Series-60 2.1 |
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* @param aBuffer - [output] Buffer to store encoded data. |
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* @param aByteIndex - [input] Starting byte index ( starts from zero ). |
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* [output] Byte index updated after encoding. |
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* @param aBitIndex - [input] Starting bit index ( starts from zero ). |
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* [output] Bit index updated after encoding. |
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* @return void |
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*/ |
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void EncodeTableOfContents( TUint8* aBuffer, |
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TInt& aByteIndex, |
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TInt& aBitIndex ); |
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|
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/** |
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* Rips off unwanted NO_DATA frames from payload according to |
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* RFC3267: 4.3.2. |
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* |
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* @since Series 60 3.0 |
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* @param None |
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* @return Number of frames discarded from a payload |
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*/ |
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virtual TInt DiscardExtraNoDataFrames(); |
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|
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/** |
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* Saves frame so it can be sent as redundancy later. |
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* |
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* @since Series 60 3.0 |
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* @param aFrameData Frame data to save |
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* @return void |
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*/ |
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virtual void SaveRedundantFrame( const TDes8& aFrameData ); |
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protected: // From CAmrPayloadFormatter |
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/** |
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* Initializes encoder. Encoder should be initialized when starting |
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* playing. |
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* |
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* @since Series 60 3.0 |
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* @param None |
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* @return void |
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*/ |
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virtual void DoInitialize(); |
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protected: // Data |
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// Encoder for payload header |
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CAmrPayloadHeader* iHeaderEncoder; |
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// Encoder for TOC entry |
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CAmrTocEntry* iTocEntryEncoder; |
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// Encoder for frame data |
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TStreamEncoder iFrameEncoder; |
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// Total speech bits in current payload |
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TInt iTotalSpeechBits; |
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// Number of redundant frames to be sent |
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TInt iRedCount; |
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// Indicates is redundancy count of sent frames collected |
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TBool iRedIntervalCollected; |
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// Indicates how many NO_DATA frames is discarded at this round |
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TInt iFramesDiscarded; |
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private: |
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#ifdef TEST_EUNIT |
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friend class UT_CAmrPayloadEncoder; |
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friend class UT_CAmrPayloadFormatWrite; |
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#endif |
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}; |
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#endif // __AMRPAYLOADENCODER_H |