/*

* Copyright (c) 2006 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:    

*

*/

#ifndef CMCEMEDIASDPCODEC_H

#define CMCEMEDIASDPCODEC_H

//  INCLUDES

#include "mcesdpcodec.h"

#include "mcecomcodec.h"

const TInt KMceMaxPTValue = 127;

const TInt KMceMaxPayloadTypes = 20;

const TBool KMceMediaCodecUpdate = ETrue;

const TBool KMceMediaCodecNoUpdate = EFalse;

/**

*  Class for encoding and decoding media lines and creating server streams

*  

*/

class CMceMediaSdpCodec : public CMceSdpCodec

    {

    public:

        /**

        * destructor

        */

        ~CMceMediaSdpCodec();

    public: //from CMceSdpCodec

        /**

        * Encodes a media line. 

        * @param aStream media stream

        * @param aMediaLine media line

        * @param aSdpDocument sdp document

        * @leave system wide error

        */ 

        void EncodeMediaOfferL( CMceComMediaStream& aStream,

                                CSdpMediaField& aMediaLine, 

                                CSdpDocument& aSdpDocument );

        /**

        * Decodes the media answer.

        * @param aStream media stream

        * @param aSdpDocument sdp document

        * @return warning if any 

        * @leave system wide error

        */

        TMceSipWarningCode DecodeMediaAnswerL( CSdpMediaField& aMediaLine, 

                                 CMceComMediaStream& aStream,

                                 CSdpDocument& aSdpDocument );

        /**

        * Decodes media offer and creates media stream. The stream is appended

        * into the media session, if aStream is NULL

        * @param aMediaLine media line

        * @param aStream stream added to session

        * @param aSession media session

        * @param aSdpDocument sdp document

        * @param aStream stream to updated, if any

        * @return warning if any 

        * @leave system wide error

        */

        TMceSipWarningCode DecodeMediaOfferL( CSdpMediaField& aMediaLine,

                                              CMceComMediaStream*& aStream,

                                              CMceComSession& aSession,

                                              CSdpDocument& aSdpDocument );

        /**

        * Decodes media update by updating media stream

        * @param aMediaLine media line

        * @param aStream stream to be updated

        * @param aSdpDocument sdp document

        * @return warning if any 

        * @leave system wide error

        */

        TMceSipWarningCode DecodeMediaUpdateL( CSdpMediaField& aMediaLine, 

                                               CMceComMediaStream& aStream,

                                               CSdpDocument& aSdpDocument );

        /**

        * Creates a encoded media line based on the offer received earlier.

        * @param aStream media stream

        * @param aMediaLine media line

        * @param aSdpDocument sdp document

        * @leave system wide error

        */

        void EncodeMediaAnswerL( CMceComMediaStream& aStream,

                                  CSdpMediaField& aMediaLine,

                                  CSdpDocument& aSdpDocument );

        /**

        * Clean attributes

        * @param aMediaLine media line

        */

        void CleanAttributes( CSdpMediaField& aMediaLine );

        /**

        * Prepares media line before offer/answer will be decoded

        * @param aMediaLine media line

        * @param aStream media stream

        * @leave system wide error

        */

        void PrepareForDecodeL( CSdpMediaField& aMediaLine,

                                CMceComMediaStream* aStream );

    protected://abstract interface

        /**

        * Returns codecs

        * @param aStream media stream

        * @param return codecs

        * @leave if stream type does not macth codecs

        */

        virtual const RPointerArray<CMceComCodec>& CodecsL( 

                                        CMceComMediaStream& aStream ) const = 0;

        /**

        * Encodes rtpmap -attribute

        * @param aCodec codec encoded to rtpmap

        * @leave system wide error

        */

        virtual CSdpFmtAttributeField* EncodeRtpmapAttributeLC( 

                                        CMceComCodec& aCodec ) const = 0;

        /**

        * Encodes media related attributes

        * @param aCodec the codec

        * @param aMediaLine media line

        * @param aRtpmap rtpmap attribute

        * @leave system wide error

        */

        virtual void EncodeMediaAttributesL( CMceComCodec& aCodec, 

                                             CSdpMediaField& aMediaLine, 

                                             CSdpFmtAttributeField& aRtpmap ) const = 0;

        /**

        * Decodes media related attributes

        * @param aMediaLine media line

        * @param aCodec the codec

        * @leave system wide error

        */

		virtual void DecodeMediaAttributesL( CSdpMediaField& aMediaLine, 

                                             CMceComCodec& aCodec,

                                             CSdpFmtAttributeField& aRtpmap ) const = 0;

        /**

        * Creates media stream based on sdp type

        * @param aType the sdp type sendrecv, sendonly or receive only

        * @return media stream

        * @leave system wide error

        */

        virtual CMceComMediaStream* CreateStreamLC( TInt aType ) const = 0;

        /**

        * Updates media based on received offer

        * @param aStream media stream

        * @param aDirection the direction 

        * @leave system wide error

        */

        virtual void UpdateStreamL( CMceComMediaStream& aStream, TInt aDirection ) const = 0;

        /**

        * Creates codec based on rtpmap line

        * @param aRtpmap rtpmap line

        * @return codec or NULL, if not supported

        * @leave system wide error

        */

        virtual CMceComCodec* CreateCodecLC( CSdpFmtAttributeField& aRtpmap ) const = 0;

        /**

        * Creates codec based on payload type

        * @param aPayload payload

        * @param aMediaLine media line

        * @return codec or NULL, if not supported

        * @leave system wide error

        */

        virtual CMceComCodec* CreateCodecLC( TUint aPayload, CSdpMediaField& aMediaLine ) const = 0;

        /**

        * Decodes session level media attributes

        * @param aStream media stream

        * @param aSdpDocument sdp document

        * @return codec or NULL, if not supported

        * @leave system wide error

        */

        virtual void DecodeSessionMediaAttributesL( CMceComMediaStream& aStream, 

                                                    CSdpDocument& aSdpDocument ) const = 0;

    protected:

        /**

        * validates sdp offer. Called before offer will be decoded

        * @param aMediaLine media line

        * @param aSdpDocument sdp document

        * @return warning

        */

        virtual TMceSipWarningCode ValidateSdpL( CSdpMediaField& aMediaLine,

                                                CSdpDocument& aSdpDocument );

        /**

        * Gets the type of session ( sendrecv, sendonly or receiveonly )

        * @param aMediaLine media line

        * @param aSessionAttributes all session attributes

        * @return type

        */

        TInt Type( CSdpMediaField& aMediaLine,

                    RPointerArray<CSdpAttributeField>& aSessionAttributes ) const;

        /**

        * Encodes direction attribute

        * @param aStream media stream

        * @param aMediaLine media line

        * @param aSdpDocument sdp document

        * @param aRole negotiation role

        */

        void EncodeDirectionL( CMceComMediaStream& aStream,

                               CSdpMediaField& aMediaLine,

                               CSdpDocument& aSdpDocument,

                               TMceNegotiationRole aRole ) const;

        /**

        * Encodes preconditions

        * @param aStream media stream

        * @param aMedia media line

        * @param aRole negotiation role

        * @leave system wide error

        */

        void EncodePreconditionsL( CMceComMediaStream& aStream,

                                   CSdpMediaField& aMediaLine,

                                   TMceNegotiationRole aRole ) const;

        /**

        * Decodes preconditions

        * @param aMedia media line

        * @param aStream media stream

        * @param aRole negotiation role

        * @return warning if any 

        * @leave system wide error

        */

        TMceSipWarningCode DecodePreconditionsL( CSdpMediaField& aMediaLine,

                                   CMceComMediaStream& aStream,

                                   TMceNegotiationRole aRole ) const;

        /**

        * Decodes rmtpmap lines in answer

        * @param aMediaLine Media line

        * @param aStream stream

        * @param aRole role of negotiation

        * @return number of lines decoded

        */

        TInt DecodeRtpmapLinesL( CSdpMediaField& aMediaLine,

                                 CMceComMediaStream& aStream,

                                 TMceNegotiationRole aRole ) const;

        /**

        * Decodes rmtpmap lines in offer, and adds codes to stream.

        * @param aMediaLine Media line

        * @param aStream stream

        * @return number of lines decoded

        */

        TInt DecodeRtpmapLinesL( CSdpMediaField& aMediaLine,

                                 CMceComMediaStream& aStream ) const;

        /**

        * Decodes rtpmap line. 

        * @param aRtpMaptLine rtpmap line

        * @param aMediaLine media line

        * @param aStream stream

        * @param aFmtpValue

        * @return decoded codec if codec was supported

        */

        CMceComCodec* DecodeRtpmapLineL( CSdpFmtAttributeField& aRtpMaptLine,

                                         CSdpMediaField& aMediaLine,

                                         CMceComMediaStream& aStream,

                                         const TDesC8& aFmtpValue = KNullDesC8 ) const;

        /**

        * Decodes fmtp lines. 

        * @pre codecs and rtpmaps are in sync 

        * @param aMediaLine Media line

        * @param aCodecs codecs

        * @param aRole the role

        */

        void DecodeFmtpLinesL( CSdpMediaField& aMediaLine,

                               CMceComCodec::TIterator& aCodecs,

                               TMceNegotiationRole aRole ) const;

        /**

        * Creates fmtp attribute and appends it into media line

        * @param aCodec the codec

        * @param aMediaLine Media line

        * @return None.

        */

        void EncodeFmtpAttributeL( CMceComCodec& aCodec,

                                   CSdpMediaField& aMediaLine ) const;

        /**

        * Encodes secure session

        * @param aStream media stream

        * @param aMediaLine Media line

        * @param aRole the role

        */

        void EncodeSecureSessionL( CMceComMediaStream& aStream, 

                                   CSdpMediaField& aMediaLine,

                                   TMceNegotiationRole aRole );

        /**

        * Decodes secure session

        * @param aMediaLine Media line

        * @param aStream media stream

        * @param aRole the role

        * @param aUpdate is it update (role EMceRoleAnswerer )

        */

        void DecodeSecureSessionL( CSdpMediaField& aMediaLine,

                                  CMceComMediaStream& aStream, 

                                  TMceNegotiationRole aRole,

                                  TBool aUpdate = KMceMediaCodecNoUpdate );

        /**

        * Decodes direction and 'old school' hold

        * @param aMediaLine Media line

        * @param aStream media stream

        * @param aSdpDocument sdp document

        * @param aRole the role

        * @param aUpdate is it update 

        */

        void DecodeDirectionL( CSdpMediaField& aMediaLine,

                                   CMceComMediaStream& aStream,

                                   CSdpDocument& aSdpDocument,

                                   TMceNegotiationRole aRole ) const;

        /**

        * Update direction and 'old school' hold

        * @param aMediaLine Media line

        * @param aStream media stream

        * @param aSdpDocument sdp document

        */

        void UpdateDirectionL( CSdpMediaField& aMediaLine, 

                                              CMceComMediaStream& aStream,

                                              CSdpDocument& aSdpDocument) const;

       /**

        * decodes the remote RTCP port according to RFC 3605

        * @param aMediaLine Media line

        * @param aStream media stream

        */

        void DecodeRemoteRtcpFieldL( CSdpMediaField& aMediaLine, 

                                     CMceComMediaStream& aStream ) const;  

        /**

        * encodes the remote RTCP port according to RFC 3605

        * @param aMediaLine Media line

        * @param aStream media stream

        */

        void EncodelocalRtcpAttrL( CSdpMediaField& aMediaLine, 

                                     CMceComMediaStream& aStream ) const; 

        /**

        * Encodes media attributes client is willing to insert

        * @param aStream media stream

        * @param aMediaLine media line

        */

        void EncodeClientAttributesL( CMceComMediaStream& aStream,

                                      CSdpMediaField& aMediaLine ) const;

        /**

        * Decodes media attributes to be sent to client

        * @param aMediaLine Media line

        * @param aStream media stream

        */

                                      CMceComMediaStream& aStream ) const;  

        /**

        * Finds codec based on payload type

        * @param aPayloadType payload

        * @param aStream stream containig codecs

        * @return codec

        */

        CMceComCodec* FindCodec( TInt aPayloadType, 

                                 CMceComMediaStream& aStream ) const;

        /**

        * Decodes payloads and static payloads if payload wasn't defined

        * as rtpmap. Additionally, codec sdp indexes are updated.

        * @param aMediaLine Media line

        * @param aStream stream

        * @param aRole role of negotiation

        * @return number of lines decoded

        */

        TInt DecodePayloadsL( CSdpMediaField& aMediaLine,

                              CMceComMediaStream& aStream,

                              TMceNegotiationRole aRole ) const;

        /**

        * Updates streams codec sdp index values. Can be called after

        * dynamic payload types have been updated.

        * @param aStream stream containig codecs

        * @param aPayloadTypes list of payload types

        */

        void UpdateSdpCodecIndexesL( CMceComMediaStream& aStream,

                                     RArray<TUint>& aPayloadTypes ) const;

        /**

        * Tries to find matching fmtp line for certain rtpmap line

        * @param aMediaLine Media line

        * @param aRtpMapFormatLine rtpmap format line

        * @return KNullDesC8 if fmtp line is not found

        */

        TPtrC8 GetCorrespondingFmtpLineL( CSdpMediaField& aMediaLine, 

                                          CSdpFmtAttributeField& aRtpMapFormatLine ) const;

    protected:

        /**

        * C++ Constructor

        * @param aMedia media

        */

        CMceMediaSdpCodec( RStringF aMedia );

    friend class UT_CMceMediaSdpCodec;

    friend class UT_CMceMediaManager;       

    friend class UT_CMceSdpSession;

    };

#endif      // CMCEMEDIASDPCODEC_H