/*

* Copyright (c) 2002-2004 Nokia Corporation and/or its subsidiary(-ies).

* All rights reserved.

* This component and the accompanying materials are made available

* under the terms of "Eclipse Public License v1.0"

* which accompanies this distribution, and is available

* at the URL "http://www.eclipse.org/legal/epl-v10.html".

*

* Initial Contributors:

* Nokia Corporation - initial contribution.

*

* Contributors:

*

* Description:    RTP Datasink

*

*/

// INCLUDE FILES

#include "mccrtpsender.h"

#include "mccrtpdefs.h"

#include "mcctimermanager.h"

// CONSTANTS

const TInt KMccMaxSendQueueSize = 30;

const TUint32 KMccRtpSendTimeoutLongMillisecs = 600;

// -----------------------------------------------------------------------------

// CMccRtpSender::NewL

// -----------------------------------------------------------------------------

//                     

CMccRtpSender* CMccRtpSender::NewL( 

    MMccRtpSenderObserver& aObserver, 

    CRtpAPI& aRtpApi, 

    TRtpId aSessionId,

    TBool aDoMarkerBasedCleanup )

    {

    TRACE_RTP_SINK_PRINT( "CMccRtpSender::NewL, entry" )

    CMccRtpSender* self = 

        new ( ELeave ) CMccRtpSender( 

            aObserver, aRtpApi, aSessionId, aDoMarkerBasedCleanup );

    CleanupStack::PushL( self );

    self->ConstructL();

    CleanupStack::Pop( self );

    TRACE_RTP_SINK_PRINT( "CMccRtpSender::NewL, exit" )

    return self;

    }

// -----------------------------------------------------------------------------

// CMccRtpSender::~CMccRtpSender

// -----------------------------------------------------------------------------

//    

CMccRtpSender::~CMccRtpSender()

    {

    TRACE_RTP_SINK_PRINT( "CMccRtpSender::~CMccRtpSender, entry" )

    Cancel();

    delete iTimeoutTimer;

    iSendQueue.ResetAndDestroy();

    TRACE_RTP_SINK_PRINT( "CMccRtpSender::~CMccRtpSender, exit" )

    }

// -----------------------------------------------------------------------------

// CMccRtpSender::SendRtpPacketL

// -----------------------------------------------------------------------------

//    

void CMccRtpSender::SendRtpPacketL( 

    TRtpId aRtpStreamId, 

    const TRtpSendHeader& aRtpHeader, 

    const TDesC8& aData )

    {

    TInt count( iSendQueue.Count() );

    if ( CheckDiscarding( aRtpHeader ) )

        {

        TRACE_RTP_SINK_PRINT2( "CMccRtpSender::SendRtpPacketL [%d], packet dropped 1", 

                               reinterpret_cast<TUint32>( this ) )

        return;

        }

    if ( count >= KMccMaxSendQueueSize )

        {

        // Full, frame must be dropped. Check also if there's already in queue

        // rtp packets which contain parts of the same frame. In that case,

        // those can be also dropped as the frame is useless if something is

        // missing from it.

        DoQueueCleanup( count - 1, aRtpHeader );

        TRACE_RTP_SINK_PRINT2( "CMccRtpSender::SendRtpPacketL [%d], packet dropped 2",

                               reinterpret_cast<TUint32>( this ) )

        return;

        }

    TRACE_RTP_SINK_PRINT3( "CMccRtpSender::SendRtpPacketL [%d], items in queue:%d", 

                           reinterpret_cast<TUint32>( this ), count )

    CMccRtpSendItem* sendItem = 

        CMccRtpSendItem::NewLC( aRtpStreamId, aRtpHeader, aData );

    iSendQueue.AppendL( sendItem );

    CleanupStack::Pop( sendItem );

    if ( !IsActive() )

        {

        SendPacketL();

        }

    }

// -----------------------------------------------------------------------------

// CMccRtpSender::SendDataL

// -----------------------------------------------------------------------------

//

void CMccRtpSender::SendDataL( TRtpId aSessionId, TBool aUseRtpSocket, 

    const TDesC8& aData )

    {

    if ( KMccMaxSendQueueSize <= iSendQueue.Count() )

        {

        TRACE_RTP_SINK_PRINT2( 

            "CMccRtpSender::SendDataL [%d], queue full, leaving",

            reinterpret_cast<TUint32>( this ) )

        User::Leave( KErrOverflow );

        }

    else

        {

        TRACE_RTP_SINK_PRINT3( 

            "CMccRtpSender::SendDataL [%d], items in queue: %d",  

            reinterpret_cast<TUint32>( this ), iSendQueue.Count() )

        CMccRtpSendItem* sendItem = 

            CMccRtpSendItem::NewLC( aSessionId, aUseRtpSocket, aData );

        iSendQueue.AppendL( sendItem );

        CleanupStack::Pop( sendItem );

        if ( !IsActive() )

            {

            SendPacketL();

            }

        }

    }

// -----------------------------------------------------------------------------

// CMccRtpSender::Clear

// -----------------------------------------------------------------------------

//

void CMccRtpSender::Clear()

    {

    TRACE_RTP_SINK_PRINT( "CMccRtpSender::Clear, entry" )

    Cancel();

    iSendQueue.ResetAndDestroy();

    iDiscarding = EFalse;

    TRACE_RTP_SINK_PRINT( "CMccRtpSender::Clear, exit" )

    }

// -----------------------------------------------------------------------------

// CMccRtpSender::RunL

// -----------------------------------------------------------------------------

//

void CMccRtpSender::RunL()

    {

    TInt status = iStatus.Int();

    TRACE_RTP_SINK_PRINT3( "CMccRtpSender::RunL [%d], status:%d", 

                           reinterpret_cast<TUint32>( this ), status )

    RemovePacket();

    if ( !ErrorReport( status ) )

        {

        SendPacketL();

        } 

    TRACE_RTP_SINK_PRINT( "CMccRtpSender::RunL, exit" )

    }

// -----------------------------------------------------------------------------

// CMccRtpSender::DoCancel

// -----------------------------------------------------------------------------

//    

void CMccRtpSender::DoCancel()

    {

    TRACE_RTP_SINK_PRINT( "CMccRtpSender::DoCancel, entry" )

    iRtpApi.CancelSend( iSessionId );

    iTimeoutTimer->Stop( iTimerId );

    TRACE_RTP_SINK_PRINT( "CMccRtpSender::DoCancel, exit" )

    }

// -----------------------------------------------------------------------------

// CMccRtpSender::RunError

// -----------------------------------------------------------------------------

//

TInt CMccRtpSender::RunError( TInt aError )

    {

    TRACE_RTP_SINK_PRINT2( "CMccRtpSender::RunError, err:%d", aError )

    ErrorReport( aError );

    if ( aError != KErrNoMemory )

        {

        aError = KErrNone;

        }

    return aError;

    }

// -----------------------------------------------------------------------------

// CMccRtpSender::InactivityTimeout

// -----------------------------------------------------------------------------

//    

void CMccRtpSender::TimerExpiredL( 

    TMccTimerId /*aTimerId*/, TAny* /*aTimerParam*/ )

    {

    TRACE_RTP_SINK_PRINT( "CMccRtpSender::TimerExpiredL, entry" )

    if ( iTimeoutTimeMilliseconds > KMccRtpSendTimeoutLongMillisecs )

        {

        // Timeout value is so long that if sending of one rtp packet really

        // took so long, receiver will have big problems and it's better

        // to drop all frames queued in order to avoid delay increase 

        // at receiver side.

        Clear();

        }

    else

        {

        // Sending timeout, cancel send and discard that packet

        Cancel();

        // Do also cleanup of related packets as those are useless as this 

        // packet is removed because of timeout

        RemovePacket( ETrue ); 

        // Send next packet anyway

        TRAPD( err, SendPacketL() )

        if ( err )

            {

            ErrorReport( err );

            }

        }

    TRACE_RTP_SINK_PRINT( "CMccRtpSender::TimerExpiredL, exit" )

    }

// -----------------------------------------------------------------------------

// CMccRtpSender::ConstructL

// -----------------------------------------------------------------------------

//

void CMccRtpSender::ConstructL()

    {

    iTimeoutTimer = CMccTimerManager::NewL();

    }

// -----------------------------------------------------------------------------

// CMccRtpSender::CMccRtpSender

// -----------------------------------------------------------------------------

//    

CMccRtpSender::CMccRtpSender( 

    MMccRtpSenderObserver& aObserver, 

    CRtpAPI& aRtpApi, 

    TRtpId aSessionId,

    TBool aDoMarkerBasedCleanup ) :

    CActive( EPriorityStandard ),

    iObserver( aObserver ),

    iRtpApi( aRtpApi ),

    iSessionId( aSessionId ),

    iDoMarkerBasedCleanup( aDoMarkerBasedCleanup ),

    iTimeoutTimeMilliseconds( KMccRtpSendTimeoutLongMillisecs )

    {

    CActiveScheduler::Add( this );

    TRACE_RTP_SINK_PRINT2( "CMccRtpSender::CMccRtpSender, marker based cleanup:%d", 

                           iDoMarkerBasedCleanup )

    }

// -----------------------------------------------------------------------------

// CMccRtpSender::SendPacketL

// -----------------------------------------------------------------------------

//

void CMccRtpSender::SendPacketL()

    {

    if ( iSendQueue.Count() > 0 )

        {

        CMccRtpSendItem* item = iSendQueue[ 0 ];

        if ( KNullId == item->SessionId( ) )

            {

            User::LeaveIfError( 

                iRtpApi.SendRtpPacket( 

                    item->RtpStreamId(), 

                    item->RtpHeader(), 

                    item->DataPtr(), 

                    iStatus ) );            

            }

        else

            {

            iRtpApi.SendDataL( item->SessionId(), item->UseRtpSocket(), 

                item->DataPtr(), iStatus );

            }

        SetActive();

        iTimeoutTimer->Stop( iTimerId );

        iTimerId = iTimeoutTimer->StartL( this, iTimeoutTimeMilliseconds );

        }

    }

// -----------------------------------------------------------------------------

// CMccRtpSender::RemovePacket

// -----------------------------------------------------------------------------

//    

void CMccRtpSender::RemovePacket( TBool aDoQueueCleanup )

    {

    if ( iSendQueue.Count() > 0 )

        {

        TBool removed( EFalse );

        if ( aDoQueueCleanup )

            {

            removed = DoQueueCleanup( 0, iSendQueue[ 0 ]->RtpHeader() );

            }

        else

            {

#ifdef TRACE_RTP_SINK

            TRACE_RTP_SINK_PRINT2( "CMccRtpSender::RemovePacket, sent packet size: %d",

                                   iSendQueue[ 0 ]->DataPtr().Length() )

#endif 

            }

        if ( !removed )

            {

            delete iSendQueue[ 0 ];

            iSendQueue.Remove( 0 );

            }

        iTimeoutTimer->Stop( iTimerId );

        }

    }

// -----------------------------------------------------------------------------

// CMccRtpSender::ErrorReport

// -----------------------------------------------------------------------------

//

TBool CMccRtpSender::ErrorReport( TInt aError )

    {    

    TBool errorReported( EFalse );

    if ( aError != KErrNone && aError != KErrCancel && aError != KErrTooBig )

        {

        iObserver.SendErrorOccured( aError );

        errorReported = ETrue;

        } 

    return errorReported;

    }

// -----------------------------------------------------------------------------

// CMccRtpSender::CheckDiscarding

// -----------------------------------------------------------------------------

//

TBool CMccRtpSender::CheckDiscarding( const TRtpSendHeader& aRtpHeader )

    {

    TBool discard( EFalse );

    if ( iDiscarding )

        {                

        if ( aRtpHeader.iMarker )

            {

            TRACE_RTP_SINK_PRINT( "CMccRtpSender::CheckDiscarding, stop discarding" )

            iDiscarding = EFalse;

            }

        discard = ETrue;

        }

    return discard;

    }

// -----------------------------------------------------------------------------

// CMccRtpSender::DoQueueCleanup

// -----------------------------------------------------------------------------

//

TBool CMccRtpSender::DoQueueCleanup( TInt aItemIndex, 

        const TRtpSendHeader& aRtpHeader )

    {

    TRACE_RTP_SINK_PRINT( "CMccRtpSender::DoQueueCleanup, entry" )

    TInt queueCount = iSendQueue.Count();

    TInt itemIndex = aItemIndex;

    TBool itemRemoved = EFalse;

    TBool markerEnabled( aRtpHeader.iMarker );

    if ( !iDoMarkerBasedCleanup || itemIndex >= queueCount )

        {

        TRACE_RTP_SINK_PRINT( "CMccRtpSender::DoQueueCleanup (disabled), exit" )

        return itemRemoved;

        }

    // Check if this item is zero marker packet or if there's items with zero

    // marker before this one in the queue. All of those can be removed as they

    // belong to the same frame.

    //

    TBool removingCompleted( EFalse );

    for ( TInt i = itemIndex; i >= 0 && !removingCompleted; i-- )

        {

        if ( !iSendQueue[ i ]->RtpHeader().iMarker )

            {

            TRACE_RTP_SINK_PRINT( "CMccRtpSender::DoQueueCleanup, clean earlier packet" )

            delete iSendQueue[ i ];

            iSendQueue.Remove( i );

            itemIndex--;

            itemRemoved = ( itemRemoved || ( i == aItemIndex ) );

            if ( i == 0 )

                {

                // Deleted first item which is always the one which is sent currently,

                // must cancel sending

                TRACE_RTP_SINK_PRINT( "CMccRtpSender::DoQueueCleanup, deleted active item" )

                Cancel();

                }

            }

        else

            {

            removingCompleted = ETrue;

            }

        }

    if ( !markerEnabled )

        {

        // If zero marker frame was removed, all upcoming frames until

        // next marker frame can be removed (also that marker frame can be removed)

        //

        removingCompleted = EFalse;

        TInt beginIndex( itemIndex + 1 );

        for ( TInt j = beginIndex; j < iSendQueue.Count() && !removingCompleted; j++ )

            {

            TRACE_RTP_SINK_PRINT( "CMccRtpSender::DoQueueCleanup, clean next packet" )

            TUint8 marker = iSendQueue[ j ]->RtpHeader().iMarker;

            delete iSendQueue[ j ];

            iSendQueue.Remove( j );

            if ( marker )

                {

                removingCompleted = ETrue;

                }

            // Start again from beginning as packet was removed from queue    

            j = beginIndex - 1;

            }

        if ( !removingCompleted )

            {

            // Following packets of the same frame can be discarded when

            // those are tried to be sent.

            iDiscarding = ETrue;

            }

        else

            {

            iDiscarding = EFalse;

            }

        }

    TRACE_RTP_SINK_PRINT2( "CMccRtpSender::DoQueueCleanup, exit with discarding:%d",

                           iDiscarding )

    return itemRemoved;

    }

// ========================== HELPER CLASS  ====================================

// -----------------------------------------------------------------------------

// CMccRtpSendItem::NewLC

// -----------------------------------------------------------------------------

//

CMccRtpSendItem* CMccRtpSendItem::NewLC( 

    TRtpId aRtpStreamId, 

    const TRtpSendHeader& aRtpHeader, 

    const TDesC8& aData )

    {

    CMccRtpSendItem* self = 

        new ( ELeave ) CMccRtpSendItem( aRtpStreamId, aRtpHeader );

    CleanupStack::PushL( self );

    self->ConstructL( aData );

    return self;

    }

// -----------------------------------------------------------------------------

// CMccRtpSendItem::NewLC

// -----------------------------------------------------------------------------

//

CMccRtpSendItem* CMccRtpSendItem::NewLC( TRtpId aSessionId, 

    TBool aUseRtpSocket, const TDesC8& aData )

    {

    CMccRtpSendItem* self = 

        new ( ELeave ) CMccRtpSendItem( aSessionId, aUseRtpSocket );

    CleanupStack::PushL( self );

    self->ConstructL( aData );

    return self;

    }

// -----------------------------------------------------------------------------

// CMccRtpSendItem::~CMccRtpSendItem

// -----------------------------------------------------------------------------

//

CMccRtpSendItem::~CMccRtpSendItem()

    {

    delete iData;

    }

// -----------------------------------------------------------------------------

// CMccRtpSendItem::DataPtr

// -----------------------------------------------------------------------------

//    

const TDesC8& CMccRtpSendItem::DataPtr() const

    {

    return iDataPtr;

    }