// Copyright (c) 2003-2009 Nokia Corporation and/or its subsidiary(-ies).

// All rights reserved.

// This component and the accompanying materials are made available

// under the terms of the License "Symbian Foundation License v1.0" to Symbian Foundation members and "Symbian Foundation End User License Agreement v1.0" to non-members

// which accompanies this distribution, and is available

// at the URL "http://www.symbianfoundation.org/legal/licencesv10.html".

//

// Initial Contributors:

// Nokia Corporation - initial contribution.

//

// Contributors:

//

// Description:

//

#ifndef __MIDISTANDARDCUSTOMCOMMANDS_H__

#define __MIDISTANDARDCUSTOMCOMMANDS_H__

#include <mmf/common/mmfcontroller.h>

#include <midiclientutility.h>

#include <mmf/common/mmfmidi.h>

/**

Interface UID for the Midi Controller API.

@publishedAll

@released

*/

const TUid KUidInterfaceMidi = { 0x101F945C };

/**

Describe a MIDI event.

Contains a UID to define the actual event type, and an integer to define the event code.

@publishedAll

@released

*/

class CMMFMidiEvent: public CBase

	{

public:

	IMPORT_C CMMFMidiEvent(TUid aEventType, TInt aErrorCode);

	IMPORT_C CMMFMidiEvent();

	IMPORT_C ~CMMFMidiEvent();

	IMPORT_C void ExternalizeL(RWriteStream& aStream) const;

	IMPORT_C void InternalizeL(RReadStream& aStream);

	IMPORT_C void CopyL(const CMMFMidiEvent& aOther);

	/**

    @internalTechnology

    */

	void ZeroMembers();

public:

   /**

    * A UID to define the type of MIDI event.

    */

	TUid iEventType;

   /**

    * The error code associated with the MIDI event.

    */

	TInt iErrorCode;

   /**

    * Old state of the MIDI client utility object.

    */

	TMidiState iOldState;

   /**

    * Current state of the MIDI client utility object.

    */

	TMidiState iNewState;

   /**

    * General purpose time stamp in microseconds.

    */

	TTimeIntervalMicroSeconds iMicroSeconds;

   /**

    * General purpose time stamp in micro beats per minute. 

    */

	TInt64 iMicroBeats;

   /**

    * Channel

    */

	TInt iChannel;

   /**

    * Volume in decibel of a logical channel.

    */

	TReal32 iVolumeInDecibels;

   /**

    * Mute state of a track or of a channel.

    */

	TBool iMute;

   /**

    * Meta data entry. 

	* Client will retrieve meta data entry by calling GetMetaDataEntryL()

	* using this TInt to indicate which meta data entry to retrieve.

    */

	TInt iMetaDataEntryId;

   /**

    * Array of logical {channel, MIP} value pairs.

    */

	RArray<TMipMessageEntry> iMipMessage; 

   /**

    * Polyphony of the MIDI engine.

    */

	TInt iPolyphony;

   /**

    * Identifier of a bank occupying, at most, 14 bits.

    */

	TInt iBankId;

   /**

    * Identifier of a specific instrument.

    */

	TInt iInstrumentId;

   /**

    * Tempo value in micro beats per minute.

    */

	TInt iTempoMicroBeats;

	};

/**

@internalComponent

*/

enum TMMFMidiControllerMessages

	{

	EMMFMidiControllerSetPositionMicroBeats,

	EMMFMidiControllerPositionMicroBeats,

	EMMFMidiControllerPlayNote,

	EMMFMidiControllerPlayNoteWithStartTime,

	EMMFMidiControllerStopNotes,

	EMMFMidiControllerNoteOn,

	EMMFMidiControllerNoteOff,

	EMMFMidiControllerPlaybackRate,

	EMMFMidiControllerSetPlaybackRate,

	EMMFMidiControllerMaxPlaybackRate,

	EMMFMidiControllerMinPlaybackRate,

	EMMFMidiControllerTempo,

	EMMFMidiControllerSetTempo,

	EMMFMidiControllerPitch,

	EMMFMidiControllerSetPitch,

	EMMFMidiControllerDurationMicroBeats,

	EMMFMidiControllerNumTracks,

	EMMFMidiControllerSetTrackMute,

	EMMFMidiControllerMimeType,

	EMMFMidiControllerSetSyncUpdateCallbackInterval,

	EMMFMidiControllerSendMessage,

	EMMFMidiControllerSendMessageWithTimeStamp,

	EMMFMidiControllerSendMipMessage,

	EMMFMidiControllerNumberOfBanks,

	EMMFMidiControllerGetBankId,

	EMMFMidiControllerLoadCustomBank,

	EMMFMidiControllerLoadCustomBankData,

	EMMFMidiControllerUnloadCustomBank,

	EMMFMidiControllerCustomBankLoaded,

	EMMFMidiControllerUnloadAllCustomBanks,

	EMMFMidiControllerNumberOfInstruments,

	EMMFMidiControllerGetInstrumentId,

	EMMFMidiControllerInstrumentName,

	EMMFMidiControllerCopyInstrumentName,

	EMMFMidiControllerSetInstrument,

	EMMFMidiControllerLoadCustomInstrument,

	EMMFMidiControllerLoadCustomInstrumentData,

	EMMFMidiControllerUnloadCustomInstrument,

	EMMFMidiControllerPercussionKeyName,

	EMMFMidiControllerCopyPercussionKeyName,

	EMMFMidiControllerSetStopTime,

	EMMFMidiControllerStopTime,

	EMMFMidiControllerPolyphony,

	EMMFMidiControllerSetMaxPolyphony,

	EMMFMidiControllerChannelsSupported,

	EMMFMidiControllerChannelVolume,

	EMMFMidiControllerMaxChannelVolume,

	EMMFMidiControllerSetChannelVolume,

	EMMFMidiControllerSetChannelMute,

	EMMFMidiControllerVolume,

	EMMFMidiControllerMaxVolume,

	EMMFMidiControllerSetVolume,

	EMMFMidiControllerSetVolumeRamp,

	EMMFMidiControllerGetBalance,

	EMMFMidiControllerSetBalance,

	EMMFMidiControllerGetRepeats,

	EMMFMidiControllerSetRepeats,

	EMMFMidiControllerSetBank,

	EMMFMidiControllerIsTrackMute,

	EMMFMidiControllerIsChannelMute,

	EMMFMidiControllerGetInstrument,

	EMMFMidiControllerClose,

	EMMFMidiControllerStop,

	EMMFMidiControllerReceiveEvents,

	EMMFMidiControllerRetrieveEvent,

	EMMFMidiControllerCancelReceiveEvents,

	EMMFMidiControllerMaxPolyphony

	};

/**

Client class to access functionality specific to a MIDI controller.

The class uses the custom command function of the controller plugin, and removes the necessity

for the client to formulate the custom commands.

@publishedAll

@released

*/

class RMidiControllerCustomCommands : public RMMFCustomCommandsBase

	{

public:

	IMPORT_C RMidiControllerCustomCommands(RMMFController& aController);

	IMPORT_C TInt SetPositionMicroBeats(TInt64 aMicroBeats) const;

	IMPORT_C TInt PositionMicroBeats(TInt64& aMicroBeats) const;

	IMPORT_C TInt PlayNote(TInt aChannel,TInt aNote,const TTimeIntervalMicroSeconds& aDuration,TInt aNoteOnVelocity,TInt aNoteOffVelocity);

	IMPORT_C TInt PlayNote(TInt aChannel,TInt aNote,const TTimeIntervalMicroSeconds& aStartTime, const TTimeIntervalMicroSeconds& aDuration,TInt aNoteOnVelocity,TInt aNoteOffVelocity);

	IMPORT_C TInt StopNotes(TInt aChannel);

	IMPORT_C TInt NoteOn(TInt aChannel,TInt aNote,TInt aVelocity);

	IMPORT_C TInt NoteOff(TInt aChannel,TInt aNote,TInt aVelocity);

	IMPORT_C TInt PlaybackRate(TInt& aPlayBackRate) const;

	IMPORT_C TInt SetPlaybackRate(TInt aPlayBackRate);

	IMPORT_C TInt MaxPlaybackRate(TInt& aMaxRate) const;

	IMPORT_C TInt MinPlaybackRate(TInt& aMinRate) const;

	IMPORT_C TInt TempoMicroBeatsPerMinute(TInt& aMicroBeatsPerMinute) const;

	IMPORT_C TInt SetTempo(TInt aMicroBeatsPerMinute);

	IMPORT_C TInt PitchTranspositionCents(TInt& aPitch) const;

	IMPORT_C TInt SetPitchTransposition(TInt aCents, TInt& aCentsApplied);

	IMPORT_C TInt DurationMicroBeats(TInt64& aDuration) const;

	IMPORT_C TInt NumTracks(TInt& aTracks) const;

	IMPORT_C TInt SetTrackMute(TInt aTrack, TBool aMuted) const;

	IMPORT_C TInt MimeType(TDes8& aMimeType) const;

	IMPORT_C TInt SetSyncUpdateCallbackInterval(const TTimeIntervalMicroSeconds& aMicroSeconds,TInt64 aMicroBeats=0);

	IMPORT_C TInt SendMessage(const TDesC8& aMidiMessage, TInt& aBytes);

	IMPORT_C TInt SendMessage(const TDesC8& aMidiMessage,const TTimeIntervalMicroSeconds& aTime, TInt& aBytes);

	IMPORT_C TInt SendMipMessage(const RArray<TMipMessageEntry>& aEntry);

	IMPORT_C TInt NumberOfBanks(TBool aCustom, TInt& aNumBanks) const;

	IMPORT_C TInt GetBankId(TBool aCustom, TInt aBankIndex, TInt& aBankId) const;

	IMPORT_C TInt LoadCustomBank(const TDesC& aFileName,TInt& aBankId);

	IMPORT_C TInt LoadCustomBankData(const TDesC8& aBankData,TInt& aBankId);

	IMPORT_C TInt UnloadCustomBank(TInt aBankId);

	IMPORT_C TInt CustomBankLoaded(TInt aBankId, TBool& aBankLoaded) const;

	IMPORT_C TInt UnloadAllCustomBanks();

	IMPORT_C TInt NumberOfInstruments(TInt aBankId, TBool aCustom, TInt& aNumInstruments) const;

	IMPORT_C TInt GetInstrumentId(TInt aBankId,TBool aCustom,TInt aInstrumentIndex, TInt& aInstrumentId) const;

	IMPORT_C HBufC* InstrumentNameL(TInt aBankId, TBool aCustom, TInt aInstrumentId) const;

	IMPORT_C TInt SetInstrument(TInt aChannel,TInt aBankId,TInt aInstrumentId);

	IMPORT_C TInt LoadCustomInstrument(const TDesC& aFileName, TInt aFileBankId, TInt aFileInstrumentId, TInt aMemoryBankId, TInt aMemoryInstrumentId);

	IMPORT_C TInt LoadCustomInstrumentData(const TDesC8& aInstrumentData, TInt aBankDataId, TInt aInstrumentDataId, TInt aMemoryBankId, TInt aMemoryInstrumentId);

	IMPORT_C TInt UnloadCustomInstrument(TInt aCustomBankId,TInt aInstrumentId);

	IMPORT_C HBufC* PercussionKeyNameL(TInt aNote, TInt aBankId, TBool aCustom, TInt aInstrumentId) const;

	IMPORT_C TInt StopTime(TTimeIntervalMicroSeconds& aStopTime) const;

	IMPORT_C TInt SetStopTime(const TTimeIntervalMicroSeconds& aStopTime) const;

	IMPORT_C TInt Polyphony(TInt& aNumNotes) const;

	IMPORT_C TInt ChannelsSupported(TInt& aChannels) const;

	IMPORT_C TInt ChannelVolume(TInt aChannel, TReal32& aChannelVol) const;

	IMPORT_C TInt MaxChannelVolume(TReal32& aMaxVol) const;

	IMPORT_C TInt SetChannelVolume(TInt aChannel,TReal32 aVolume);

	IMPORT_C TInt SetChannelMute(TInt aChannel,TBool aMuted);

	IMPORT_C TInt Volume(TInt& aVolume) const;

	IMPORT_C TInt MaxVolume(TInt& aMaxVolume) const;

	IMPORT_C TInt SetVolume(TInt aVolume);

	IMPORT_C TInt SetVolumeRamp(const TTimeIntervalMicroSeconds& aRampDuration);

	IMPORT_C TInt GetBalance(TInt& aBalance) const;

	IMPORT_C TInt SetBalance(TInt aBalance);

	IMPORT_C TInt SetMaxPolyphony(TInt aMaxNotes);

	IMPORT_C TInt GetRepeats(TInt& aNumRepeats) const;

	IMPORT_C TInt SetRepeats(TInt aRepeatNumberOfTimes, const TTimeIntervalMicroSeconds& aTrailingSilence);

 	IMPORT_C TInt SetBank(TBool aCustom);

	IMPORT_C TInt IsTrackMute(TInt aTrack, TBool& aTrackMute) const;

	IMPORT_C TInt IsChannelMute(TInt aChannel, TBool& aChannelMute) const;

	IMPORT_C TInt GetInstrument(TInt aChannel, TInt& aInstrumentId, TInt& aBankId);

	IMPORT_C TInt Close();

	IMPORT_C TInt Stop(const TTimeIntervalMicroSeconds& aFadeOutDuration);

	IMPORT_C void ReceiveEvents(TPckgBuf<TInt>& aEventSize, TRequestStatus& aStatus);

	IMPORT_C TInt RetrieveEvent(TDes8& aMidiEventPckg);

	IMPORT_C TInt CancelReceiveEvents();

	IMPORT_C TInt MaxPolyphony(TInt& aNumNotes) const;

	};

/**

Mixin class to be derived from by controller plugins wishing 

to support the MIDI controller custom commands.

@publishedAll

@released

*/

class MMidiCustomCommandImplementor

	{

public:

    /**

    Change the position of the currently playing MIDI resource to the given position.

    May be called whenever a MIDI resource is open.

    @param aMicroBeats 

	       Metrical position to move to. Clamped to (0, DurationMicroBeats()).

    */

	virtual void  MmcSetPositionMicroBeatsL(TInt64 aMicroBeats) = 0;

    /**

    Gets the current metrical position of the MIDI resource being played

    @param aMicroBeats 

	       (BPM*1000000) relative to the start of the resource

    */

	virtual void  MmcPositionMicroBeatsL(TInt64& aMicroBeats) = 0;

    /**

    Synchronous function to play a single note.

    Multiple calls to this function will be accommodated as far as the MIDI engine can

    manage. The same functionality could be implemented using the SendMessage function

    @param aChannel 

	       Logical channel to play note on. 0 <= aChannel <= 15.

    @param aNote 

	       Note to play. 0 <= aNote <= 127

    @param aDuration 

	       Length of time to play note for.

    @param aNoteOnVelocity 

	       Velocity with which to start the note. 0 <= aNoteOnVelocity <= 127.

    @param aNoteOffVelocity 

	       Velocity with which to stop the note. 0 <= aNoteOffVelocity <= 127.

    */

	virtual void  MmcPlayNoteL(TInt aChannel,TInt aNote,const TTimeIntervalMicroSeconds& aDuration,TInt aNoteOnVelocity,TInt aNoteOffVelocity) = 0;

    /**

    Synchronous function to play a single note at a specified time.

    Multiple calls to this function will be accommodated as far as the MIDI engine can

    manage. The same functionality could be implemented using the SendMessage function

    @param aChannel 

	       Logical channel to play note on. 0 <= aChannel <= 15.

    @param aNote 

	       Note to play. 0 <= aNote <= 127

    @param aStartTime 

	       Specifies the time at which to start playing the note, relative to the MIDI

		   resource playing time or the time elapsed since Play() was called if no resource is present.

    @param aDuration 

	       Length of time to play note for.

    @param aNoteOnVelocity 

	       Velocity with which to start the note. 0 <= aNoteOnVelocity <= 127.

    @param aNoteOffVelocity 

	       Velocity with which to stop the note. 0 <= aNoteOffVelocity <= 127.

    */

	virtual void  MmcPlayNoteL(TInt aChannel,TInt aNote,const TTimeIntervalMicroSeconds& aStartTime, const TTimeIntervalMicroSeconds& aDuration,TInt aNoteOnVelocity,TInt aNoteOffVelocity) = 0;

    /**

    Stops the playback of all notes on the given channel,

    by means of an All Notes Off MIDI message

    @param aChannel 

	       Logical channel to stop notes on. 0 <= aChannel <= 15

    */

	virtual void  MmcStopNotesL(TInt aChannel) = 0;

    /**

    Synchronous function to commence playback of a note.

    Multiple calls to this function will be accommodated as far as the MIDI engine can manage

    @param aChannel 

	       Logical channel to play note on. 0 <= aChannel <= 15.

    @param aNote 

	       Note to play. 0 <= aNote <= 127.

    @param aVelocity 

	       Velocity with which to start the note. The legal integer range

		   is 0 <= aVelocity <= 127, but the value zero actually causes the 

		   message to be interpreted as a Note Off message instead of a Note On.

    */

	virtual void  MmcNoteOnL(TInt aChannel,TInt aNote,TInt aVelocity) = 0;

    /**

    Synchronous function to terminate playback of a note.

    If no corresponding note is found then no error is raised

    @param aChannel 

	       Logical channel on which the note is playing. 0 <= aChannel <= 15.

    @param aNote

	       Note to terminate. 0 <= aNote <= 127.

    @param aVelocity 

	       Velocity with which to stop the note. 0 <= aVelocity <= 127.

           There is no standard behaviour corresponding with note off velocity.

    */

	virtual void  MmcNoteOffL(TInt aChannel,TInt aNote,TInt aVelocity) = 0;

    /**

    Gets the current playback rate factor of the currently open MIDI resource.

    The playback rate is independent from tempo,

    i.e., it can be used to give an overall speed factor for playback.

    @param aPlayBackRate 

	       Current playback rate in percent times 1000, i.e., 100000 means original 

		   playback speed, 200000 means double speed, and 50000 means half speed playback.

    */

	virtual void  MmcPlaybackRateL(TInt& aPlayBackRate) = 0;

    /**

    Sets the playback rate for the playback of the current MIDI resource.

    The playback rate is independent from tempo,

    i.e., it can be used to give an overall speed factor for playback.

    May be called whether playback is in progress or not.

    @param aPlayBackRate 

	       Playback rate in percent times 1000, i.e., 100000 means original playback speed,

		   200000 means double speed, and 50000 means half speed playback.

    */

	virtual void  MmcSetPlaybackRateL(TInt aPlayBackRate) = 0;

    /**

    Gets the maximum playback rate in milli-percentage from the MIDI engine.

    @see SetPlaybackRate() for milli-percentage details.

    @param aMaxRate 

	       Playback rate supported by MIDI player.

    */

	virtual void  MmcMaxPlaybackRateL(TInt& aMaxRate) = 0;

    /**

    Gets the minimum playback rate in milli-percentage from the MIDI engine.

    @see SetPlaybackRate() for milli-percentage details.

    @param aMinRate 

	       Minimum playback rate supported by MIDI player.

    */

	virtual void  MmcMinPlaybackRateL(TInt& aMinRate) = 0;

    /**

    Gets the current tempo of the currently open MIDI resource. The tempo is independent

    from the playback rate, i.e., the resulting playback speed will be affected by both.

    @param  aMicroBeatsPerMinute 

	        Tempo at the current position of the currently open resource in microbeats

			per minute, i.e. BPM * 1000000. Filled in by the controller framework.

    */

	virtual void  MmcTempoMicroBeatsPerMinuteL(TInt& aMicroBeatsPerMinute) = 0;

    /**

    Sets the tempo at which the current MIDI resource should be played.

    May be called whether playback is in progress or not. The tempo is 

	independent from the playback rate, i.e., the resulting playback speed

	will be affected by both.

    @param aMicroBeatsPerMinute 

	       Tempo in microbeats per minute (BPM*1000000) to set.

    */

	virtual void  MmcSetTempoL(TInt aMicroBeatsPerMinute) = 0;

    /**

    Gets the pitch shift in use for the currently open MIDI resource.

    @param aPitch 

	       Shift in cents, i.e. semitones * 100. One octave equals 1200 cents.

    @return One of the system-wide error codes.

    */

	virtual void  MmcPitchTranspositionCentsL(TInt& aPitch) = 0;

    /**

    Sets the pitch shift to apply to the currently open MIDI resource.

    May be called during playback.

    @param aCents 

	       Pitch shift in cents, i.e. semitones * 100. One octave equals 1200 cents.

    @param aCentsApplied 

	       Actual pitch shift applied - may differ from the requested value due

		   to limitations of the MIDI engine.

    */

	virtual void  MmcSetPitchTranspositionL(TInt aCents, TInt& aCentsApplied) = 0;

    /**

    Gets the length of the currently open MIDI resource in micro-beats

    @param aDuration 

	       Duration in microbeats (beats * 1000000).

    */

	virtual void  MmcDurationMicroBeatsL(TInt64& aDuration) = 0;

    /**

    Gets the number of tracks present in the currently open MIDI resource.

    @param aTracks 

	       Number of tracks.

    */

	virtual void  MmcNumTracksL(TInt& aTracks) = 0;

    /**

    Mutes or unmutes a particular track.

    @param aTrack 

	       Index of the track to mute - 0 <= aTrack < NumTracks().

    @param aMuted 

	       ETrue to mute the track, EFalse to unmute it.

    */

	virtual void  MmcSetTrackMuteL(TInt aTrack, TBool aMuted) = 0;

    /**

    Gets the MIME type of the MIDI resource currently open.

    @param aMimeType

	       Descriptor containing the MIDI mime type.

    */

	virtual void  MmcMimeTypeL(TDes8& aMimeType) = 0;

    /**

    Sets the frequency at which MMIDIClientUtilityObserver::MmcuoSyncUpdateL() is called

    to allow other components to synchronise with playback of this MIDI resource.

    @param aMicroSeconds

	       Temporal interval to callback at. Used in preference to aMicroBeats if both are set.

    @param aMicroBeats

	       Metrical interval to callback at. Set both parameters to zero to cancel.

    */

	virtual void  MmcSetSyncUpdateCallbackIntervalL(const TTimeIntervalMicroSeconds& aMicroSeconds,TInt64 aMicroBeats=0) = 0;

    /**

    Sends a single MIDI message to the MIDI engine.

    @param aMidiMessage

	       Descriptor containing the MIDI message data. If there are several

           MIDI messages in the buffer, only the first one is processed.

    @param aBytes

	       Number of bytes of the message buffer actually processed.

    */

	virtual void  MmcSendMessageL(const TDesC8& aMidiMessage, TInt& aBytes) = 0;

    /**

    Sends a single MIDI message, with time stamp, to the MIDI engine.

    @param aMidiMessage 

	       Descriptor containing the MIDI message data. If there are several

		   MIDI messages in the buffer, only the first one is processed.

    @param aTime

	       The time at which to execute the message, relative to the MIDI resource playing

           time or the time elapsed since Play() was called if no resource is present.

    @param aBytes       

	       Number of bytes of the message buffer actually processed.

    */

	virtual void  MmcSendMessageL(const TDesC8& aMidiMessage,const TTimeIntervalMicroSeconds& aTime, TInt& aBytes) = 0;

    /**

    Sends a mip message to the MIDI engine. This is a convenience function,

    because the same functionality could be achieved with the SendMessage() function.

    @param aEntry 

	       Array of logical {channel, MIP} value pairs to send, highest priority first.

    */

	virtual void  MmcSendMipMessageL(const TArray<TMipMessageEntry>& aEntry) = 0;

    /**

    Gets the number of standard or custom sound banks currently available.

    @param aCustom

	       Specifies whether to reference a custom or standard sound bank.

    @param aNumBanks 

	       Number of custom or standard sound banks available.

    */

	virtual void  MmcNumberOfBanksL(TBool aCustom, TInt& aNumBanks) = 0;

    /**

    Gets the identifier of a sound bank. Bank identifier (aka bank number) is a

    14-bit value consisting of MIDI bank MSB and LSB values.

    @param  aCustom

            Specifies whether to reference a custom or standard sound bank.

    @param  aBankIndex

	        Index of sound bank where 0 <= aBankIndex < NumberOfBanks().

    @param  aBankId

            Identifier of the specified bank occupying, at most, 14 bits.

    */

	virtual void  MmcGetBankIdL(TBool aCustom, TInt aBankIndex, TInt& aBankId) = 0;

    /**

    Loads one or more custom sound banks from a file into memory for use.

    If several banks are loaded with consequent LoadCustomBanksL() function calls,

    the banks are combined if the bank sets have conflicting bank numbers.

    @param aFileName

	       Name of the file containing the custom sound bank.

    @param aBankId

	       Identifier of the custom sound bank loaded, occupying no more than 14 bits.

    */

	virtual void  MmcLoadCustomBankL(const TDesC& aFileName,TInt& aBankId) = 0;

    /**

    Loads one or more custom sound banks from a descriptor into memory for use.

    If several banks are loaded with consequent LoadCustomBanksL() function calls,

    the banks are combined if the bank sets have conflicting bank numbers.

    @param aBankData

	       Descriptor containing the custom sound bank.

    @param aBankId

	       Identifier of the custom sound bank loaded, occupying no more than 14 bits.

    */

	virtual void  MmcLoadCustomBankDataL(const TDesC8& aBankData,TInt& aBankId) = 0;

    /**

    Removes a custom sound bank from memory. Only valid for sound banks previously

	loaded from file. Once unloaded the custom sound bank is no longer available for use.

    @param aBankId 

	       Identifier of the custom sound bank to unload,occupying no more than 14 bits.

    */

	virtual void  MmcUnloadCustomBankL(TInt aBankId) = 0;

    /**

    Query if a bank has been loaded to the memory.

    @param aBankId

	       Identifier of the custom sound bank to check if it's in memory or not.

    @param aBankLoaded

	       ETrue if the specified bank is in memory, EFalse otherwise.

    */

	virtual void  MmcCustomBankLoadedL(TInt aBankId, TBool& aBankLoaded) = 0;

    /**

    Removes all custom sound banks from memory.

    */

	virtual void  MmcUnloadAllCustomBanksL() = 0;

    /**

    Gets the number of instruments available in a given sound bank.

    @param aBankId

	       Identifier of sound bank to reference, occupying no more than 14 bits.

    @param aCustom

	       Specifies whether to reference a custom or standard sound bank.

    @param aNumInstruments

	       Count of the number of instruments available for the specified sound bank.

    */

	virtual void  MmcNumberOfInstrumentsL(TInt aBankId, TBool aCustom, TInt& aNumInstruments) = 0;

    /**

    Gets the identifier of an instrument.

    @param aBankId

	       Identifier of the sound bank to reference, occupying no more than 14 bits.

    @param aCustom

	       Specifies whether to reference a custom or standard sound bank.

    @param aInstrumentIndex

	       Index of the instrument to reference where 0 <= aInstrumentIndex < NumberOfInstrumentsL(). 

    @param aInstrumentId

	       Identifier of specified instrument. This may differ from the index since the

		   index simply enumerates the instruments, whereas identifiers may not be 

		   contiguous, especially where certain instruments correspond to General MIDI-defined

		   instruments but not all instruments are present. Instrument identifiers are

		   between 0 and 127 inclusive.

    */

	virtual void  MmcGetInstrumentIdL(TInt aBankId,TBool aCustom,TInt aInstrumentIndex, TInt& aInstrumentId) = 0;

    /**

    Gets the name of the given instrument.

    @param  aBankId

	        Identifier of the bank that the instrument belongs to, occupying no more than 14 bits.

    @param  aCustom

	        Specifies whether to reference a custom or standard sound bank.

    @param  aInstrumentId

	        Identifier of the instrument under scrutiny. 0 <= aInstrumentId <= 127.

    @return Buffer containing the name of the specified instrument.

            If it has no name then an empty descriptor is returned.

    */

	virtual const TDesC& MmcInstrumentNameL(TInt aBankId, TBool aCustom, TInt aInstrumentId) = 0;

    /**

    Sets a logical channel to use the given instrument.

    @param aChannel

	       Logical channel to set the instrument for. 0 <= aChannel <= 15.

    @param aBankId

	       Identifier of the bank that the instrument belongs to, occupying no more than 14 bits.

           The bank ID is a concatenation of MIDI bank MSB and LSB values.

    @param aInstrumentId

	       Identifier of the instrument under scrutiny. 0 <= aInstrumentId <= 127.

    */

	virtual void  MmcSetInstrumentL(TInt aChannel,TInt aBankId,TInt aInstrumentId) = 0;

    /**

    Loads an individual instrument from file into custom sound bank memory for use.

    The bank and instrument ids given in the file can be mapped into different bank

    and instrument ids in memory.

    @param aFileName

	       Name of the file containing the instrument.

    @param aFileBankId

	       Identifier of the bank in the file from which to load the instrument,

           occupying no more than 14 bits.

    @param aFileInstrumentId

	       Identifier of the instrument to load. 0 <= aInstrumentId <= 127.

    @param aMemoryBankId

	       Identifier of the custom bank in memory to load the instrument into,

           occupying no more than 14 bits.

    @param aMemoryInstrumentId

	       Identifier of the instrument in memory to load the new instrument into.

		   0 <= aInstrumentId <= 127.

    */

	virtual void  MmcLoadCustomInstrumentL(const TDesC& aFileName, TInt aFileBankId, TInt aFileInstrumentId, TInt aMemoryBankId, TInt aMemoryInstrumentId) = 0;

    /**

    Loads an individual instrument from descriptor into custom sound bank memory for use.

    The bank and instrument ids given in the descriptor can be mapped into different bank

    and instrument ids in memory.

    @param aInstrumentData

	       Descriptor containing the instrument.

    @param aBankDataId

	       Identifier of the bank in the descriptor from which to load the instrument,

           occupying no more than 14 bits.

    @param aInstrumentDataId

	       Identifier of the instrument to load. 0 <= aInstrumentId <= 127.

    @param aMemoryBankId

	       Identifier of the custom bank in memory to load the instrument into,

           occupying no more than 14 bits.

    @param aMemoryInstrumentId

	       Identifier of the instrument in memory to load the new instrument into.

		   0 <= aInstrumentId <= 127.

    */

	virtual void  MmcLoadCustomInstrumentDataL(const TDesC8& aInstrumentData, TInt aBankDataId, TInt aInstrumentDataId, TInt aMemoryBankId, TInt aMemoryInstrumentId) = 0;

    /**

    Removes an instrument from custom sound bank memory.

    Only valid for instruments previously loaded from file.

    Once unloaded the instrument is no longer available for use.

    @param aCustomBankId

	       Identifier of the custom sound bank containing the instrument 

           to unload, occupying no more than 14 bits.

    @param aInstrumentId

	       Identifier of the instrument to unload. 0 <= aInstrumentId <= 127.

    */

	virtual void  MmcUnloadCustomInstrumentL(TInt aCustomBankId,TInt aInstrumentId) = 0;

    /**

    Gets the name of a particular percussion key corresponding to a given note.

    @param aNote

	       Note to query. 0 <= aNote <= 127.

    @param aBankId

	       Identifier of the bank that the instrument belongs to, occupying no more than 14 bits.

           The bank ID is a concatenation of MIDI bank MSB and LSB values.

    @param aCustom

	       Specifies whether to reference a custom or standard sound bank.

    @param aInstrumentId

	       Identifier of an instrument.

    @return Descriptor containing the name of the percussion key.

            If the key does not have a name then an empty descriptor is returned.

    */

	virtual const TDesC& MmcPercussionKeyNameL(TInt aNote, TInt aBankId, TBool aCustom, TInt aInstrumentId) = 0;

    /**

    Get the stop time currently set for the MIDI resource.

    @param aStopTime

	       Time at which playback will stop, relative to the start of the resource.

    @return Descriptor containing the name of the percussion key. If the key

            does not have a name then an empty descriptor is returned.

    */

	virtual void  MmcStopTimeL(TTimeIntervalMicroSeconds& aStopTime) = 0;

    /**

    Sets the stop time to use for the currently open MIDI resource

    @param aStopTime

	       Time at which playback will stop, relative to the start of the resource.

           Clamped to 0 and the duration of the resource.

    */

	virtual void  MmcSetStopTimeL(const TTimeIntervalMicroSeconds& aStopTime) = 0;

    /**

    Gets the number of currently active voices.

    @param aNumNotes

	       The number of currently active voices.

    */

	virtual void  MmcPolyphonyL(TInt& aNumNotes) = 0;

    /**

    Get the maximum number of logical channels supported by the MIDI engine.

    @param aChannels 

	       The maximum number of logical channels that the MIDI engine supports, 0 <= aChannels <=15.

    */

	virtual void  MmcChannelsSupportedL(TInt& aChannels) = 0;

    /**

    Get the current volume setting of a logical channel.

    @param aChannel

	       Logical channel to query. 0 <= aChannel <= 15.

    @param aChannelVol

	       Volume currently set on the specified channel in decibels.

    */

	virtual void  MmcChannelVolumeL(TInt aChannel, TReal32& aChannelVol) = 0;

    /**

    Gets the Maximum volume setting that may be applied to a logical channel.

    @param aMaxVol

	       Maximum volume setting. Minimum value is -infinity dB, which is 

	       the smallest possible value that TReal32 supports.

    */

	virtual void  MmcMaxChannelVolumeL(TReal32& aMaxVol) = 0;

    /**

    Set the volume of a channel.

    @param aChannel

	       Logical channel to set the volume on. 0 <= aChannel <= 15.

    @param aVolume

	       The channel volume can be set within a range. The minimum channel 

	       volume is -infinity dB, which is the smallest possible value that

	       TReal32 supports while the maximum channel volume is set via MaxVolumeL()

	       which represents the volume level in dB corresponding to the MIDI Channel 

	       Volume controller.

    */

	virtual void  MmcSetChannelVolumeL(TInt aChannel,TReal32 aVolume) = 0;

    /**

    Set the muting state of a channel without changing its volume setting.

    When unmuted the channel goes back to its previous volume setting.

    @param aChannel

	       Logical channel to set the mute state of. 0 <= aChannel <= 15.

    @param aMuted

	       ETrue to mute the channel, EFalse to unmute it.

    */

	virtual void  MmcSetChannelMuteL(TInt aChannel,TBool aMuted) = 0;

    /**

    Gets the overall volume of the MIDI client.

    @param aVolume

	       The current overall volume setting.

    */

	virtual void  MmcVolumeL(TInt& aVolume) = 0;

    /**

    Maximum volume setting that may be applied overall.

    @param aMaxVolume

	       Maximum volume setting. Minimum value is always zero which is silent.

    */

	virtual void  MmcMaxVolumeL(TInt& aMaxVolume) = 0;

    /**

    Set the overall volume of the MIDI client.

    This setting scales all channel volumes respectively so the actual volume

    that a channel is played at becomes (overall volume * channel volume / max volume).

    @param aVolume Overall volume setting to use.

    */

	virtual void  MmcSetVolumeL(TInt aVolume) = 0;

    /**

    Length of time over which the volume is faded up from zero to the current settings

    when playback is started.

    @param aRampDuration

	       Duration of the ramping period.

    */

	virtual void  MmcSetVolumeRampL(const TTimeIntervalMicroSeconds& aRampDuration) = 0;

    /**

    Get the current stereo balance value.

    @param aBalance

	       Balance value ranging from KMMFBalanceMaxLeft to KMMFBalanceMaxRight.

    */

	virtual void  MmcGetBalanceL(TInt& aBalance) = 0;

    /**

    Set the current stereo balance value.

    @param aBalance

	       Balance value to set. Defaults to KMMFBalanceCenter to restore equal left-right balance.

    */

	virtual void  MmcSetBalanceL(TInt aBalance) = 0;

    /**

    Set the max polyphony level the engine can handle.

    @param aMaxNotes

	       Max polyphony level,  0 <= PolyphonyL() <= aMaxNotes.

    */

	virtual void  MmcSetMaxPolyphonyL(TInt aMaxNotes) = 0;

    /**

    Gets the number of times the current opened resources have to be repeated.

    @param aNumRepeats

	       The number of time the current opened resources have to be repeated.

    */

	virtual void  MmcGetRepeatsL(TInt& aNumRepeats) = 0;

    /**

    Set the number of times to repeat the current MIDI resource.

    After Stop() has been called, repeat number of times and the trailing silence are reset.

    @param aRepeatNumberOfTimes

	       Number of times to repeat the resource during playback. This includes the first playing.

    @param aTrailingSilence 

	       Time in microseconds to pause between repeats.

    */

	virtual void  MmcSetRepeatsL(TInt aRepeatNumberOfTimes, const TTimeIntervalMicroSeconds& aTrailingSilence) = 0;

    /**

    Tell the MIDI engine to use a custom bank or a standard bank.

    @param aCustom

	       If Etrue the custom bank in memory is used otherwise the standard bank 

		   is used leaving the custom bank in memory.

    */

	virtual void  MmcSetBankL(TBool aCustom) = 0;

    /**

    Gets the muting status of a specific track.

    @param aTrack

	       The track to query.

    @param aTrackMute

	       The mute status of the track.

    */

	virtual void  MmcIsTrackMuteL(TInt aTrack, TBool& aTrackMute) = 0;

    /**

    Gets the muting status of a specific channel.

    @param aChannel

	       The channel to query.

    @param aChannelMute

	       The mute status of the channel.

    */

	virtual void  MmcIsChannelMuteL(TInt aChannel, TBool& aChannelMute) = 0;

    /**

    Gets the instrument assigned to a specified channel.

    @param aChannel

	       Logical channel, 0 <= aChannel <= 15.

    @param aInstrumentId

	       Identifier of the instrument assigned to aChannel. 0 <= aInstrumentId <= 127.

    @param aBankId

	       Identifier of the bank that the instrument belongs to, occupying no more than 14 bits.

    */

	virtual void  MmcGetInstrumentL(TInt aChannel, TInt& aInstrumentId, TInt& aBankId) = 0;

    /**

    Closes any currently open resources, such as files, descriptors or URLs in use.

    Does nothing if there is nothing currently open.

    */

	virtual void  MmcCloseL() = 0;

    /**

    Stops playback of a resource but does not change the current position or release any resources.

    Pauses the internal timer if no resource is open.

    @param aFadeOutDuration

	       Length of time over which the volume is faded out from the current settings to zero.

    */

	virtual void  MmcStopL(const TTimeIntervalMicroSeconds& aFadeOutDuration) = 0;

    /**

    Gets the max polyphony level the engine can handle.

    @param aNumNotes

	       Max polyphony level,  PolyphonyL() <= aMaxNotes.

    */

	virtual void  MmcMaxPolyphonyL(TInt& aMaxNotes) = 0;

	};

/**

@internalComponent

*/

class CMidiEventReceiver : public CBase

	{

public:

	static CMidiEventReceiver* NewL(const TMMFMessage& aMessage);

	~CMidiEventReceiver();

	void PrepareEventL(const CMMFMidiEvent& aEvent);

	void SendEventL(TMMFMessage& aMessage);

	TBool IsWaitingToSendEvent();

private:

	CMidiEventReceiver(const TMMFMessage& aMessage);

private:

	TMMFMessage iMessage;

	CBufFlat* iEventBuf;

	};

/**

Mixin class to define an object capable of handling a MIDI event within the controller framework.

@publishedAll

@released

*/

class MMidiEventHandler

	{

public:

    /**

    Send an event to the client.

    @param aEvent

	       The MIDI event.

	@return One of the system-wide error codes.

    */

	virtual TInt SendMidiEventToClient(const CMMFMidiEvent& aEvent) = 0;

	};

/**

Custom command parser class to be used by controller plugins wishing to support

MIDI controller commands.

The controller plugin must be derived from MMidiCustomCommandImplementor

to use this class. The controller plugin should create an object of this type and add 

it to the list of custom command parsers in the controller framework.

@publishedAll

@released

*/

class CMidiCustomCommandParser : public CMMFCustomCommandParserBase,

								 public MMidiEventHandler	

	{

public:

	IMPORT_C static CMidiCustomCommandParser* NewL(MMidiCustomCommandImplementor& aImplementor);

	IMPORT_C ~CMidiCustomCommandParser();

	/**

    @internalTechnology

    */

	void HandleRequest(TMMFMessage& aMessage);

	virtual TInt SendMidiEventToClient(const CMMFMidiEvent& aEvent);

private:

	CMidiCustomCommandParser(MMidiCustomCommandImplementor& aImplementor);

	// Internal request handling methods.

	void DoHandleRequestL(TMMFMessage& aMessage);

	TBool DoSetPositionMicroBeatsL(TMMFMessage& aMessage);

	TBool DoPositionMicroBeatsL(TMMFMessage& aMessage);

	TBool DoPlayNoteL(TMMFMessage& aMessage);

	TBool DoPlayNoteWithStartTimeL(TMMFMessage& aMessage);

	TBool DoStopNotesL(TMMFMessage& aMessage);

	TBool DoNoteOnL(TMMFMessage& aMessage);

	TBool DoNoteOffL(TMMFMessage& aMessage);

	TBool DoPlaybackRateL(TMMFMessage& aMessage);

	TBool DoSetPlaybackRateL(TMMFMessage& aMessage);

	TBool DoMaxPlaybackRateL(TMMFMessage& aMessage);

	TBool DoMinPlaybackRateL(TMMFMessage& aMessage);

	TBool DoTempoMicroBeatsPerMinuteL(TMMFMessage& aMessage);

	TBool DoSetTempoL(TMMFMessage& aMessage);

	TBool DoPitchTranspositionCentsL(TMMFMessage& aMessage);

	TBool DoSetPitchTranspositionL(TMMFMessage& aMessage);

	TBool DoDurationMicroBeatsL(TMMFMessage& aMessage);

	TBool DoNumTracksL(TMMFMessage& aMessage);

	TBool DoSetTrackMuteL(TMMFMessage& aMessage);

	TBool DoMimeTypeL(TMMFMessage& aMessage);

	TBool DoSetSyncUpdateCallbackIntervalL(TMMFMessage& aMessage);

	TBool DoSendMessageL(TMMFMessage& aMessage);

	TBool DoSendMessageWithTimeStampL(TMMFMessage& aMessage);

	TBool DoSendMipMessageL(TMMFMessage& aMessage);

	TBool DoNumberOfBanksL(TMMFMessage& aMessage);

	TBool DoGetBankIdL(TMMFMessage& aMessage);

	TBool DoLoadCustomBankL(TMMFMessage& aMessage);

	TBool DoLoadCustomBankDataL(TMMFMessage& aMessage);

	TBool DoUnloadCustomBankL(TMMFMessage& aMessage);

	TBool DoCustomBankLoadedL(TMMFMessage& aMessage);

	TBool DoUnloadAllCustomBanksL(TMMFMessage& aMessage);

	TBool DoNumberOfInstrumentsL(TMMFMessage& aMessage);

	TBool DoGetInstrumentIdL(TMMFMessage& aMessage);