/*

* Copyright (c) 2006-2007 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:    Contains functionality for DTMF and line event 

*                decoding and playing.

*

*/

// INCLUDES

#include "dtmfpayloadformatread.h"

#include "dtmfpayloaddecoder.h"

#include "dtmfeventpayloadinfo.h"

#include "dtmftonepayloadinfo.h"

#include "mccuids.hrh"

// ======== MEMBER FUNCTIONS ========

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

// CDTMFPayloadFormatRead::CDTMFPayloadFormatRead

// C++ default constructor can NOT contain any code, that

// might leave.

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

//

CDTMFPayloadFormatRead::CDTMFPayloadFormatRead()

    {

    DP_DTMF_READ( _L("CDTMFPayloadFormatRead::CDTMFPayloadFormatRead") );

    }

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

// CDTMFPayloadFormatRead::ConstructL

// Symbian 2nd phase constructor can leave.

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

//

void CDTMFPayloadFormatRead::ConstructL( MDataSource* aSource )

    {

    DP_DTMF_READ( _L("CDTMFPayloadFormatRead::ConstructL") );

    iClip = aSource;

    iBufferToReadExists = EFalse;

    // Initialize decoding state machine

    iStateMachine = CFormatDecodeStateMachine::NewL( this );

    iStateMachine->ChangeState( EDecodeIdle );

    iPayloadDecoder = CDTMFPayloadDecoder::NewL();

    iTonePlayer = CMdaAudioToneUtility::NewL( *this );

    TInt maxVol = iTonePlayer->MaxVolume();

    // Use intermediate volume value

    iTonePlayer->SetVolume( ( maxVol / 2 ) );

    }

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

// CDTMFPayloadFormatRead::NewL

// Two-phased constructor.

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

//

CDTMFPayloadFormatRead* CDTMFPayloadFormatRead::NewL( MDataSource* aSource )

    {

    DP_DTMF_READ( _L("CDTMFPayloadFormatRead::NewL") );

    __ASSERT_ALWAYS( aSource, User::Leave( KErrArgument ) );

    CDTMFPayloadFormatRead* self = new( ELeave ) CDTMFPayloadFormatRead;

    CleanupStack::PushL( self );

    self->ConstructL( aSource );

    CleanupStack::Pop( self );

    return self;

    }

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

// CDTMFPayloadFormatRead::~CDTMFPayloadFormatRead

// Destructor.

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

//

CDTMFPayloadFormatRead::~CDTMFPayloadFormatRead()

    {

    DP_DTMF_READ( _L("CDTMFPayloadFormatRead::~CDTMFPayloadFormatRead") );

    if ( iSourceBufOwnership )

        {

        delete iSourceBuffer;

        }

    iSourceBuffer = NULL;

    delete iPayloadDecoder;

    if ( iStateMachine )

        {

        iStateMachine->Cancel();

        delete iStateMachine;

        }

    delete iTonePlayer;

    // for PC_LINT #1740

    iClip = NULL;

    iEventPayloadInfo.Close();

    iTonePayloadInfo.Close();

    }

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

// CDTMFPayloadFormatRead::Streams

// Not applicable for DTMF payload formatter. Pure virtual method

// implementation needed anyway.

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

//

TUint CDTMFPayloadFormatRead::Streams( TUid aMediaType ) const

    {

    DP_DTMF_READ( _L("CDTMFPayloadFormatRead::Streams") );

    if ( KUidMediaTypeAudio == aMediaType )

        {

        return 1;

        }

    else

        {

        return 0;

        }

    }

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

// CDTMFPayloadFormatRead::FrameTimeInterval

// Not applicable for DTMF payload formatter. Pure virtual method

// implementation needed anyway.

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

//

TTimeIntervalMicroSeconds CDTMFPayloadFormatRead::FrameTimeInterval( 

    TMediaId /*aMediaType*/ ) const

    {

    DP_DTMF_READ( _L("CDTMFPayloadFormatRead::FrameTimeInterval") );

    return TTimeIntervalMicroSeconds( TInt64( 0 ) );

    }

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

// CDTMFPayloadFormatRead::Duration

// Not applicable for DTMF payload formatter. Pure virtual method

// implementation needed anyway.

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

//

TTimeIntervalMicroSeconds CDTMFPayloadFormatRead::Duration( 

    TMediaId /*aMediaType*/ ) const

    {

    DP_DTMF_READ( _L("CDTMFPayloadFormatRead::Duration") );

    return TTimeIntervalMicroSeconds( TInt64( 0 ) );

    }

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

// CDTMFPayloadFormatRead::CanCreateSourceBuffer

// SourceBuffer creation is not supported, because there is no need to

// exchange DTMF data with datapath. DTMF payload formatter handles DTMF

// playing independently through tone player.

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

//

TBool CDTMFPayloadFormatRead::CanCreateSourceBuffer()

    {

    DP_DTMF_READ( _L("CDTMFPayloadFormatRead::CanCreateSourceBuffer") );

    return EFalse;

    }

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

// CDTMFPayloadFormatRead::CreateSourceBufferL

// Should not be used.

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

//

CMMFBuffer* CDTMFPayloadFormatRead::CreateSourceBufferL( TMediaId /*aMediaId*/,

    TBool& /*aReference*/ )

    {

    DP_DTMF_READ( _L("CDTMFPayloadFormatRead::CreateSourceBufferL") );

    User::Leave( KErrNotSupported );

    return NULL;

    }

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

// CDTMFPayloadFormatRead::SourceDataTypeCode

// Returns source data type code.

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

//

TFourCC CDTMFPayloadFormatRead::SourceDataTypeCode( TMediaId aMediaId )

    {

    DP_DTMF_READ( _L("CDTMFPayloadFormatRead::SourceDataTypeCode() ") );

    if ( KUidMediaTypeAudio == aMediaId.iMediaType )

        {

        return TFourCC( KMccFourCCIdDTMF );

        }

    else

        {

         // Defaults to 'NULL' fourCC

        return TFourCC();

        }

    }

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

// CDTMFPayloadFormatRead::SinkDataTypeCode

// Returns the current datatype FourCC code.

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

//

TFourCC CDTMFPayloadFormatRead::SinkDataTypeCode( TMediaId aMediaId )

    {

    DP_DTMF_READ( _L("CDTMFPayloadFormatRead::SinkDataTypeCode") );

    if ( KUidMediaTypeAudio == aMediaId.iMediaType )

        {

        return TFourCC( KMccFourCCIdDTMF );

        }

    else

        {

         // Defaults to 'NULL' fourCC

        return TFourCC();

        }

    }

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

// CDTMFPayloadFormatRead::SetPayloadFormat

// Sets payload format used in DTMF decoding.

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

//

TInt CDTMFPayloadFormatRead::SetPayloadFormat( 

    TDTMFPayloadFormat aPayloadFormat )

    {

    DP_DTMF_READ2( _L("CDTMFPayloadFormatWrite::SetPayloadFormat - Format: %d"),

        aPayloadFormat );

    TInt err = iPayloadDecoder->SetPayloadFormat( aPayloadFormat );

    if ( KErrNone == err )

        {

        iPayloadFormat = aPayloadFormat;

        }

    return err;

    }

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

// CDTMFPayloadFormatRead::FillBufferL

// No need for data exchange with DataPath. DTMF receiving and processing

// cycle is managed by SourcePrimeL(), SourcePlayL(), SourcePauseL(),

// SourceStopL() methods.

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

//

void CDTMFPayloadFormatRead::FillBufferL( CMMFBuffer* /*aBuffer*/, 

                                          MDataSink* /*aConsumer*/, 

                                          TMediaId /*aMediaId*/ )

    {

    DP_DTMF_READ( _L("CDTMFPayloadFormatRead::FillBufferL") );

    User::Leave( KErrNotSupported );

    }

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

// CDTMFPayloadFormatRead::FillSourceBufferL

// Called by state machine. Send fill buffer request to the RTP Data Source.

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

//

void CDTMFPayloadFormatRead::FillSourceBufferL()

    {

    DP_DTMF_READ( _L("CDTMFPayloadFormatRead::FillSourceBufferL") );

    iClip->FillBufferL( iSourceBuffer, this, KUidMediaTypeAudio ); 

    }

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

// CDTMFPayloadFormatRead::FillSinkBuffer

// Called by state machine. Decode payload to DTMF string and fill

// sink buffer.

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

//

void CDTMFPayloadFormatRead::FillSinkBufferL()

    {

    DP_DTMF_READ( _L("CDTMFPayloadFormatRead::FillSinkBufferL") );

    if ( iBufferToReadExists )

        {

        // Decode payload here and send data for continued handling in 

        // SendDataToSinkL()

        switch ( iPayloadFormat )

            {

            case EDTMFPayloadFormatEvent:

            case EDTMFPayloadFormatRedEvents:

                iPayloadDecoder

                    ->DecodeEventPayload( iSourceBuffer, iEventPayloadInfo );

                break;

            case EDTMFPayloadFormatTone:

                iPayloadDecoder

                    ->DecodeTonePayload( iSourceBuffer, iTonePayloadInfo );

                break;

            default:

                // Undefined Payload format

                DP_DTMF_READ( _L("Unsupported payload format!") );

                ASSERT( EFalse );

                break;

            }

        iStateMachine->ChangeState( EEmptyDataToSink );

        }

    else

        {

        DP_DTMF_READ( _L("No DTMF packets waiting at Data source.") );

        FillSourceBufferL();

        }

    }

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

// CDTMFPayloadFormatRead::SendDataToSinkL

// Called by state machine. Send decoded payload to sound device for playback.

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

//

void CDTMFPayloadFormatRead::SendDataToSinkL()

    {

    DP_DTMF_READ( _L("CDTMFPayloadFormatRead::SendDataToSinkL") );

    if ( iBufferToReadExists )

        {

        iBufferToReadExists = EFalse;

        if ( EDTMFPayloadFormatEvent == iPayloadFormat 

             || EDTMFPayloadFormatRedEvents == iPayloadFormat )

            {

            HandleDTMFEventsL();

            }

        else if ( EDTMFPayloadFormatTone == iPayloadFormat )

            {

            HandleDTMFTones();

            }

        else

            {

            // undefined payload format

            DP_DTMF_READ( _L("Unsupported payload format!") );

            ASSERT( EFalse );

            }

        }

    FillSourceBufferL();

    }

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

// CDTMFPayloadFormatRead::HandleDTMFEvents

// Handle and play DTMF events using tone player.

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

//

void CDTMFPayloadFormatRead::HandleDTMFEventsL()

    {

    DP_DTMF_READ3( _L("CDTMFPayloadFormatRead::HandleDTMFEventsL, EVENTCOUNT: %d, tick = %u"),

        iEventPayloadInfo.Count(), User::NTickCount() );

    const TUint eventCount( iEventPayloadInfo.Count() );

    if ( 1 == eventCount )

        {

        // Stop DTMF playing when end bit is set or new

        // event has been received

        if ( iEventPayloadInfo[0].EndBit() )

            {

            DP_DTMF_READ( _L("END BIT SET, CANCEL") );

            iTonePlayer->CancelPlay();

            }

        else

            {

            TBool prepareToPlay( EFalse );

            if ( iFirstPacket )

                {

                DP_DTMF_READ( _L("M BIT SET, CANCEL") );

                iFirstPacket = EFalse;

                prepareToPlay = ETrue;

                }

            else if ( iCurrentEvent != iEventPayloadInfo[0].Event()

                || iTimeStampOfPrevEvent != iEventPayloadInfo[0].TimeStamp() )

                {

                DP_DTMF_READ( _L("NEW EVENT, CANCEL") );

                prepareToPlay = ETrue;

                }

            else

                {

                // Make PC-LINT happy

                }                

            iTimeStampOfPrevEvent = iEventPayloadInfo[0].TimeStamp();

            if ( prepareToPlay )

                {

                DP_DTMF_READ( _L("PREPARING TO PLAY NEW DIGIT") );

                iTonePlayer->CancelPlay();

                iCurrentEvent = iEventPayloadInfo[0].Event();

                // Play DTMF until we have received final packet

                TBuf<1> buf;

                buf.Append( iEventPayloadInfo[0].Event() );

                iTonePlayer->SetDTMFLengths( KDTMFMaxTonePlaybackTime,

                                             KDTMFDefToneOffLengthInUs,

                                             KDTMFDefPauseLengthInUs );

                iTonePlayer->PrepareToPlayDTMFString( buf );

                }

            }            

        }

    else if ( 1 < eventCount )

        {

        // Play out contiguous (mutually exclusive) events

        TBuf<KMaxDtmfRedCount> buf;

        for ( TUint i = 0; i < KMaxDtmfRedCount; i++ )

            {

            buf.Append( iEventPayloadInfo[i].Event() );

            }

        // Playing with default settings

        iTonePlayer->PrepareToPlayDTMFString( buf );

        }

    else

        {

        // Some error, no events

        }

    // Reset for a new RTP packet and to save memory

    iEventPayloadInfo.Reset();

    }

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

// CDTMFPayloadFormatRead::HandleDTMFTones

// NOT SUPPORTED. Handle and play DTMF tone payload.

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

//

void CDTMFPayloadFormatRead::HandleDTMFTones()

    {

    DP_DTMF_READ( _L("CDTMFPayloadFormatRead::HandleDTMFTones") );

    const TUint toneCount( iTonePayloadInfo.Count() );

    // Loop is needed for subscriber line event construction, which may have

    // longer cycles than one tone play out. E.g. "special information tone".

    // TBD: PlayDualToneL may stop previous tone playback

    for ( TUint i = 0; i < toneCount; i++ )

        {

        iTonePlayer->SetVolume( iTonePayloadInfo[i].Volume() );

        iTonePlayer->PrepareToPlayDualTone( 

                                        iTonePayloadInfo[i].LowFrequency(),

                                        iTonePayloadInfo[i].HighFrequency(),

                                        iTonePayloadInfo[i].ToneOnPeriod() );

        }

    }

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

// CDTMFPayloadFormatRead::SourceThreadLogon

// Passes logon request to the RTP data source.

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

//

TInt CDTMFPayloadFormatRead::SourceThreadLogon(

    MAsyncEventHandler& aEventHandler )

    {

    DP_DTMF_READ( _L("CDTMFPayloadFormatRead::SourceThreadLogon") );

    if ( iClip )

        {

        iClip->SourceThreadLogon( aEventHandler );

        return KErrNone;

        }

    else

        {

        return KErrNotReady;

        }

    }

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

// CDTMFPayloadFormatRead::SourceThreadLogoff

// Passes log out request to the RTP data source.

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

//

void CDTMFPayloadFormatRead::SourceThreadLogoff( )

    {

    DP_DTMF_READ( _L("CDTMFPayloadFormatRead::SourceThreadLogoff") );

    iClip->SourceThreadLogoff( );

    }

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

// CDTMFPayloadFormatRead::SourcePrimeL

// Passes prime transition to the RTP data source.

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

//

void CDTMFPayloadFormatRead::SourcePrimeL()

    {

    DP_DTMF_READ( _L("CDTMFPayloadFormatRead::SourcePrimeL") );

    iClip->SourcePrimeL();

    }

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

// CDTMFPayloadFormatRead::SourcePlayL

// Passes play transition to the RTP data source.

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

//

void CDTMFPayloadFormatRead::SourcePlayL()

    {

    DP_DTMF_READ( _L("CDTMFPayloadFormatRead::SourcePlayL") );

    iClip->SourcePlayL();

    FillSourceBufferL();

    }

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

// CDTMFPayloadFormatRead::SourcePauseL

// Passes pause transition to the RTP data source.

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

//

void CDTMFPayloadFormatRead::SourcePauseL()

    {