dvrengine/CommonRecordingEngine/src/CCRRtpTcpStream.cpp
author Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
Thu, 17 Dec 2009 09:14:38 +0200
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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 the License "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:    Single media stream for RTP/TCP streamer*
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*/
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// INCLUDE FILES
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#include "CCRRtpTcpStream.h"
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#include "CCRRtpTcpObserver.h"
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#include <es_sock.h>
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#include <e32math.h>
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#include "videoserviceutilsLogger.h"
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// CONSTANTS
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const TInt KReceiverReportLength( 12 );
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// ============================ MEMBER FUNCTIONS ===============================
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// -----------------------------------------------------------------------------
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// CCRRtpTcpStream::CCRRtpTcpStream
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// -----------------------------------------------------------------------------
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//
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CCRRtpTcpStream::CCRRtpTcpStream( MCRRtpTcpObserver& aObserver )
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  : iObserver(aObserver)
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    {
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    iSSRC = Math::Random();
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    }
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// -----------------------------------------------------------------------------
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// CCRRtpTcpStream::NewL
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// -----------------------------------------------------------------------------
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//
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CCRRtpTcpStream* CCRRtpTcpStream::NewL( MCRRtpTcpObserver& aObserver )
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    {
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    CCRRtpTcpStream* self = new( ELeave ) CCRRtpTcpStream( aObserver );
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    CleanupStack::PushL( self );
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    self->ConstructL();
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    CleanupStack::Pop( self );
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    return self;
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    }
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// -----------------------------------------------------------------------------
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// CCRRtpTcpStream::ConstructL
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// -----------------------------------------------------------------------------
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//
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void CCRRtpTcpStream::ConstructL()
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    {
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    // None
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    }
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// -----------------------------------------------------------------------------
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// CCRRtpTcpStream::~CCRRtpTcpStream
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// -----------------------------------------------------------------------------
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//
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CCRRtpTcpStream::~CCRRtpTcpStream()
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    {
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    // None
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    }
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// -----------------------------------------------------------------------------
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// CCRRtpTcpStream::ForwardPacketAvailable
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// -----------------------------------------------------------------------------
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//
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void CCRRtpTcpStream::PacketAvailable( TInt aChannel )
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    {
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    // Nothing to to do for RTP, just ignore
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    if ( !( aChannel % 2 ) )
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        {
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        return;
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        }
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    // Very simple Receiver Report generation:
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    // - RC=0, no SSRC report blocks -> no statistics keeping
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    // - one RR for every SR received -> no timing, back-off, etc
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    TBuf8<KReceiverReportLength> chunk( KNullDesC8 );
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    chunk.SetLength( KReceiverReportLength );
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    // RTSP header
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    chunk[0] = ( TUint8 )( 0x24 );     // magic '$' for embedded binary in RTSP     
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    chunk[1] = ( TUint8 )( aChannel ); // enbedded RTSP channel
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    // Embedded packet length, fixed
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    BigEndian::Put16( ( TUint8* )chunk.Ptr() + 2, 8 ); 
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    // RR
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    chunk[4] = 0x80; // v=2, p=0, rc=0
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    chunk[5] = 201;  // PT= RR= 201
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    // Length=1 ( in 32bits, -1 )
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    BigEndian::Put16( ( TUint8* )chunk.Ptr() + 6, 1 );     
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    BigEndian::Put32( ( TUint8* )chunk.Ptr() + 8, iSSRC );
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    iObserver.ForwardRtpTcpChunck( chunk );
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    }
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//  End of File