Class CMidiClientUtility

class CMidiClientUtility : public CBase;

Description

Utility class to provide a standard client interface to a MIDI controller.

Derivation

• CBase - Base class for all classes to be instantiated on the heap

• CMidiClientUtility - Utility class to provide a standard client interface to a MIDI controller

Members

Defined in CMidiClientUtility:
ChannelVolumeL(), ChannelsSupportedL(), Close(), CustomBankLoadedL(), CustomCommandAsync(), CustomCommandAsync(), CustomCommandSyncL(), CustomCommandSyncL(), DurationMicroBeatsL(), DurationMicroSecondsL(), GetBalanceL(), GetBankIdL(), GetDRMCustomCommand(), GetInstrumentIdL(), GetInstrumentL(), GetMetaDataEntryL(), GetRepeats(), InstrumentNameL(), IsChannelMuteL(), IsTrackMuteL(), LoadCustomBankDataL(), LoadCustomBankL(), LoadCustomInstrumentDataL(), LoadCustomInstrumentL(), MaxChannelVolumeL(), MaxPlaybackRateL(), MaxPolyphonyL(), MaxVolumeL(), MimeTypeL(), MinPlaybackRateL(), NewL(), NewL(), NoteOffL(), NoteOnL(), NumTracksL(), NumberOfBanksL(), NumberOfInstrumentsL(), NumberOfMetaDataEntriesL(), OpenDes(), OpenFile(), OpenFile(), OpenFile(), OpenUrl(), PercussionKeyNameL(), PitchTranspositionCentsL(), Play(), PlayNoteL(), PlayNoteL(), PlaybackRateL(), PolyphonyL(), PositionMicroBeatsL(), PositionMicroSecondsL(), SendMessageL(), SendMessageL(), SendMipMessageL(), SetBalanceL(), SetBankL(), SetChannelMuteL(), SetChannelVolumeL(), SetInstrumentL(), SetMaxPolyphonyL(), SetPitchTranspositionL(), SetPlaybackRateL(), SetPositionMicroBeatsL(), SetPositionMicroSecondsL(), SetPriorityL(), SetRepeatsL(), SetStopTimeL(), SetSyncUpdateCallbackIntervalL(), SetTempoL(), SetTrackMuteL(), SetVolumeL(), SetVolumeRampL(), State(), Stop(), StopNotes(), StopTimeL(), TempoMicroBeatsPerMinuteL(), UnloadAllCustomBanksL(), UnloadCustomBankL(), UnloadCustomInstrumentL(), VolumeL(), ~CMidiClientUtility()

Inherited from CBase:
Delete(), Extension_(), operator new()

Capability:

MultimediaDD

A process requesting or using this method that has MultimediaDD capability will always have precedence over a process that does not have MultimediaDD.

static IMPORT_C CMidiClientUtility *NewL(MMidiClientUtilityObserver &aObserver, TInt aPriority=EMdaPriorityNormal, TMdaPriorityPreference aPref=EMdaPriorityPreferenceTimeAndQuality);

Description

Static factory function for creating a MIDI client utility object. This function is synchronous, unlike the other factory functions, because it doesn't need to perform any MIDI resource initialisation The underlying controller that is created will be given its own heap.

Parameters

MMidiClientUtilityObserver &aObserver Reference to an object to receive callbacks on completion of asynchronous functions. TInt aPriority Priority of this client - defaults to EMdaPriorityNormal. TMdaPriorityPreference aPref Priority preference of this client - defaults to EMdaPriorityPreferenceTimeAndQuality.

Return value

CMidiClientUtility * Fully constructed utility object ready to have an OpenXxxx() function called.

Capability:

MultimediaDD

A process requesting or using this method that has MultimediaDD capability will always have precedence over a process that does not have MultimediaDD.

static IMPORT_C CMidiClientUtility *NewL(MMidiClientUtilityObserver &aObserver, TInt aPriority, TMdaPriorityPreference aPref, TBool aUseSharedHeap);

Description

Static factory function for creating a MIDI client utility object. This function is synchronous, unlike the other factory functions, because it doesn't need to perform any MIDI resource initialisation.

Parameters

MMidiClientUtilityObserver &aObserver Reference to an object to receive callbacks on completion of asynchronous functions. TInt aPriority Priority of this client - defaults to EMdaPriorityNormal. TMdaPriorityPreference aPref Priority preference of this client - defaults to EMdaPriorityPreferenceTimeAndQuality. TBool aUseSharedHeap Select if the underlying controller will have its own heap or share a single heap with other controller instances. The default behaviour, or if this value is EFalse, is that each controller is created with its own heap. The alternative, if the value is ETrue, is that controllers share a special heap with other controllers created the same way. Each heap uses a chunk, so this avoids situations where the number of chunks per process is limited. The default behaviour is generally to be preferred, and should give lower overall memory usage. However, if many controllers are to be created for a particular thread, then ETrue should be provided to prevent running out of heaps or chunks.

Return value

CMidiClientUtility * Fully constructed utility object ready to have an OpenXxxx() function called.

virtual ~CMidiClientUtility();

Description

Destructor

IMPORT_C TMidiState State() const;

Description

Gets the current state of the MIDI client utility with regard to MIDI resources

Return value

TMidiState The current state of the utility

IMPORT_C void OpenFile(const TDesC &aFileName);

Description

Asynchronous function to open a file containing MIDI data and perform initialisation ready for playback

Parameters

const TDesC &aFileName Name of the MIDI file to open

IMPORT_C void OpenFile(const RFile &aFile);

Description

Asynchronous function to open a file containing MIDI data and perform initialisation ready for playback

Parameters

const RFile &aFile Open handle to the midi file to read

IMPORT_C void OpenFile(const TMMSource &aSource);

Description

Asynchronous function to open a file containing MIDI data and perform initialisation ready for playback

Parameters

const TMMSource &aSource

IMPORT_C void OpenDes(const TDesC8 &aDescriptor);

Description

Asynchronous function to open a descriptor containing MIDI data and perform initialisation ready for playback

Parameters

const TDesC8 &aDescriptor descriptor containing MIDI data

IMPORT_C void OpenUrl(const TDesC &aUrl, TInt aIapId=KUseDefaultIap, const TDesC8 &aMimeType=KNullDesC8);

Description

Asynchronous function to open a URL containing MIDI data and perform initialisation ready for playback

Parameters

const TDesC &aUrl Uniform Resource Locator for a MIDI data stream TInt aIapId Identifier of the Internet Access Point to use - available from CommDB, the comms connections database. Defaults to using the default access point, as defined by CommDB const TDesC8 &aMimeType Mime type of the MIDI data stream to be played. Defaults to nothing in which case the an attempt will be made to recognise the type of the MIDI data automatically.

IMPORT_C void Close();

Description

Asynchronous function which closes any currently open resources, such as files, descriptors or URLs in use. Does nothing if there is nothing currently open.

IMPORT_C void Play();

Description

Asynchronous function to initiate or resume playback of a previously opened resource. Also used to start an internal timer to establish a zero-time for the media stream time relative to which commands with timestamps are timed against

IMPORT_C void Stop(const TTimeIntervalMicroSeconds &aFadeOutDuration);

Description

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

Parameters

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

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

Description

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

Parameters

TInt aChannel Logical channel to play note on. 0 <= aChannel <= 15. TInt aNote Note to play. 0 <= aNote <= 127 const TTimeIntervalMicroSeconds &aDuration Length of time to play note for. TInt aNoteOnVelocity Velocity with which to start the note. 0 <= aNoteOnVelocity <= 127. TInt aNoteOffVelocity Velocity with which to stop the note. 0 <= aNoteOffVelocity <= 127.

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

Description

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

Parameters

TInt aChannel Logical channel to play note on. 0 <= aChannel <= 15. TInt aNote Note to play. 0 <= aNote <= 127 const TTimeIntervalMicroSeconds &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 const TTimeIntervalMicroSeconds &aDuration Length of time to play note for. TInt aNoteOnVelocity Velocity with which to start the note. 0 <= aNoteOnVelocity <= 127. TInt aNoteOffVelocity Velocity with which to stop the note. 0 <= aNoteOffVelocity <= 127.

IMPORT_C void StopNotes(TInt aChannel);

Description

Stops the playback of all notes on the given channel, by means of an All Notes Off MIDI message

Parameters

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

IMPORT_C void NoteOnL(TInt aChannel, TInt aNote, TInt aVelocity);

Description

Synchronous function to commence playback of a note. Multiple calls to this function will be accommodated as far as the MIDI engine can manage

Parameters

TInt aChannel Logical channel to play note on. 0 <= aChannel <= 15 TInt aNote Note to play. 0 <= aNote <= 127 TInt 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.

IMPORT_C void NoteOffL(TInt aChannel, TInt aNote, TInt aVelocity);

Description

Synchronous function to terminate playback of a note. If no corresponding note is found then no error is raised.

Parameters

TInt aChannel Logical channel on which the note is playing. 0 <= aChannel <= 15. TInt aNote Note to terminate. 0 <= aNote <= 127. TInt aVelocity Velocity with which to stop the note. 0 <= aVelocity <= 127. There is no standard behaviour corresponding with note off velocity.

IMPORT_C TInt PlaybackRateL() const;

Description

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

Return value

TInt Current playback rate in percent times 1000, i.e., 100000 means original playback speed, 200000 means double speed, and 50000 means half speed playback

IMPORT_C void SetPlaybackRateL(TInt aRate);

Description

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.

Parameters

TInt aRate Playback rate in percent times 1000, i.e., 100000 means original playback speed, 200000 means double speed, and 50000 means half speed playback

IMPORT_C TInt MaxPlaybackRateL() const;

Description

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

Return value

TInt Maximum playback rate supported by MIDI player

IMPORT_C TInt MinPlaybackRateL() const;

Description

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

Return value

TInt Minimum playback rate supported by MIDI player.

IMPORT_C TInt TempoMicroBeatsPerMinuteL() const;

Description

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.

Return value

TInt Tempo at the current position of the currently open resource in microbeats per minute, i.e. BPM * 1000000. Filled in by the controller framework

IMPORT_C void SetTempoL(TInt aMicroBeatsPerMinute);

Description

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

Parameters

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

IMPORT_C TInt PitchTranspositionCentsL() const;

Description

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

Return value

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

IMPORT_C TInt SetPitchTranspositionL(TInt aCents);

Description

Sets the pitch shift to apply to the currently open MIDI resource. May be called during playback aCents parameter is not checked - if the value is out of range, it is expected KErrArgument is return by MIDI engine.

Parameters

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

Return value

TInt Actual pitch shift applied - may differ from the requested value due to limitations of the MIDI engine

IMPORT_C TTimeIntervalMicroSeconds DurationMicroSecondsL() const;

Description

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

Return value

TTimeIntervalMicroSeconds Duration in microseconds (seconds * 1000000).

IMPORT_C TInt64 DurationMicroBeatsL() const;

Description

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

Return value

TInt64 Duration in microbeats (beats * 1000000).

IMPORT_C TInt NumTracksL() const;

Description

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

Return value

TInt Number of tracks

IMPORT_C void SetTrackMuteL(TInt aTrack, TBool aMuted) const;

Description

Mutes or unmutes a particular track

Parameters

TInt aTrack Index of the track to mute - 0 <= aTrack < NumTracksL(). TBool aMuted ETrue to mute the track, EFalse to unmute it.

IMPORT_C const TDesC8 &MimeTypeL();

Description

Gets the MIME type of the MIDI resource currently open

Return value

const TDesC8 & Descriptor containing the MIDI mime type

IMPORT_C TTimeIntervalMicroSeconds PositionMicroSecondsL() const;

Description

Gets the current temporal position of the MIDI resource being played.

Return value

TTimeIntervalMicroSeconds Microseconds relative to the start of the resource

IMPORT_C void SetPositionMicroSecondsL(const TTimeIntervalMicroSeconds &aPosition);

Description

Change the position of the currently playing MIDI resource to the given position. May be called whenever a MIDI resource is open

Parameters

const TTimeIntervalMicroSeconds &aPosition Temporal position to move to. Clamped to (0, DurationMicroSecondsL()).

IMPORT_C TInt64 PositionMicroBeatsL() const;

Description

Gets the current metrical position of the MIDI resource being played

Return value

TInt64 Microbeats (BPM*1000000) relative to the start of the resource

IMPORT_C void SetPositionMicroBeatsL(TInt64 aMicroBeats);

Description

Change the position of the currently playing MIDI resource to the given position. May be called whenever a MIDI resource is open.

Parameters

TInt64 aMicroBeats Metrical position to move to. Clamped to (0, DurationMicroBeatsL()).

IMPORT_C void SetSyncUpdateCallbackIntervalL(const TTimeIntervalMicroSeconds &aMicroSeconds, TInt64 aMicroBeats=0);

Description

Sets the frequency at which MMIDIClientUtilityObserver::MmcuoSyncUpdateL(…) is called to allow other components to synchronise with playback of this MIDI resource

Parameters

const TTimeIntervalMicroSeconds &aMicroSeconds Temporal interval to callback at. Used in preference to aMicroBeats if both are set TInt64 aMicroBeats Metrical interval to callback at. Set both parameters to zero to cancel.

IMPORT_C TInt SendMessageL(const TDesC8 &aMidiMessage);

Description

Sends a single MIDI message to the MIDI engine

Parameters

const TDesC8 &aMidiMessage Descriptor containing the MIDI message data. If there are several MIDI messages in the buffer, only the first one is processed

Return value

TInt

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

Description

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

Parameters

const TDesC8 &aMidiMessage Descriptor containing the MIDI message data. If there are several MIDI messages in the buffer, only the first one is processed const TTimeIntervalMicroSeconds &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

Return value

TInt

IMPORT_C void SendMipMessageL(const RArray< TMipMessageEntry > &aEntry);

Description

Sends a mip message to the MIDI engine. This is a convenience function, because the same functionality could be achieved with the SendMessage() function

Parameters

const RArray< TMipMessageEntry > &aEntry Array of logical {channel, MIP} value pairs to send, highest priority first

IMPORT_C TInt NumberOfBanksL(TBool aCustom) const;

Description

Gets the number of standard or custom sound banks currently available

Parameters

TBool aCustom Specifies whether to reference a custom or standard sound bank

Return value

TInt Number of custom or standard sound banks available

IMPORT_C TInt GetBankIdL(TBool aCustom, TInt aBankIndex) const;

Description

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

Parameters

TBool aCustom Specifies whether to reference a custom or standard sound bank TInt aBankIndex Index of sound bank where 0 <= aBankIndex < NumberOfBanksL(…)

Return value

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

IMPORT_C void LoadCustomBankL(const TDesC &aFileName, TInt &aBankCollectionIndex);

Description

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 colliding bank numbers

Parameters

const TDesC &aFileName Name of the file containing the custom sound bank TInt &aBankCollectionIndex Identifier of the custom sound bank loaded, occupying no more than 14 bits

IMPORT_C void LoadCustomBankDataL(const TDesC8 &aBankData, TInt &aBankCollectionIndex);

Description

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 colliding bank numbers

Parameters

const TDesC8 &aBankData Descriptor containing the custom sound bank TInt &aBankCollectionIndex Identifier of the custom sound bank loaded, occupying no more than 14 bits.

IMPORT_C void UnloadCustomBankL(TInt aBankCollectionIndex);

Description

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.

Parameters

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

IMPORT_C TBool CustomBankLoadedL(TInt aBankCollectionIndex) const;

Description

Query if a bank has been loaded to the memory

Parameters

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

Return value

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

IMPORT_C void UnloadAllCustomBanksL();

Description

Removes all custom sound banks from memory.

IMPORT_C TInt NumberOfInstrumentsL(TInt aBankId, TBool aCustom) const;

Description

Gets the number of instruments available in a given sound bank

Parameters

TInt aBankId Identifier of sound bank to reference, occupying no more than 14 bits TBool aCustom Specifies whether to reference a custom or standard sound bank

Return value

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

IMPORT_C TInt GetInstrumentIdL(TInt aBankId, TBool aCustom, TInt aInstrumentIndex) const;

Description

Gets the identifier of an instrument.

Parameters

TInt aBankId Identifier of the sound bank to reference, occupying no more than 14 bits. TBool aCustom Specifies whether to reference a custom or standard sound bank. TInt aInstrumentIndex Index of the instrument to reference where 0 <= aInstrumentIndex < NumberOfInstrumentsL().

Return value

TInt 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.

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

Description

Gets the name of the given instrument.

Parameters

TInt aBankId Identifier of the bank that the instrument belongs to, occupying no more than 14 bits TBool aCustom Specifies whether to reference a custom or standard sound bank TInt aInstrumentId Identifier of the instrument under scrutiny. 0 <= iInstrumentId <= 127.

Return value

HBufC * Buffer containing the name of the specified instrument. If it has no name then an empty descriptor is returned

IMPORT_C void GetInstrumentL(TInt aChannel, TInt &aInstrumentId, TInt &aBankId);

Description

Gets the instrument assigned to a specified channel

Parameters

TInt aChannel Logical channel, 0 <= aChannel <= 15. TInt &aInstrumentId Identifier of the instrument assigned to aChannel. 0 <= iInstrumentId <= 127 TInt &aBankId Identifier of the bank that the instrument belongs to, occupying no more than 14 bits

IMPORT_C void SetInstrumentL(TInt aChannel, TInt aBankId, TInt aInstrumentId);

Description

Sets a logical channel to use the given instrument.

Parameters

TInt aChannel Logical channel to set the instrument for. 0 <= aChannel <= 15 TInt 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 TInt aInstrumentId Identifier of the instrument under scrutiny. 0 <= iInstrumentId <= 127.

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

Description

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

Parameters

const TDesC &aFileName Name of the file containing the instrument TInt aFileBankId Identifier of the bank in the file from which to load the instrument, occupying no more than 14 bits TInt aFileInstrumentId Identifier of the instrument to load. 0 <= aInstrumentId <= 127 TInt aMemoryBankId Identifier of the custom bank in memory to load the instrument into, occupying no more than 14 bits. TInt aMemoryInstrumentId Identifier of the instrument in memory to load the new instrument into. 0 <= aInstrumentId <= 127.

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

Description

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

Parameters

const TDesC8 &aInstrumentData Descriptor containing the instrument TInt aBankDataId Identifier of the bank in the descriptor from which to load the instrument, occupying no more than 14 bits TInt aInstrumentDataId Identifier of the instrument to load. 0 <= aInstrumentId <= 127 TInt aMemoryBankId Identifier of the custom bank in memory to load the instrument into, occupying no more than 14 bits TInt aMemoryInstrumentId Identifier of the instrument in memory to load the new instrument into. 0 <= aInstrumentId <= 127.

IMPORT_C void UnloadCustomInstrumentL(TInt aCustomBankId, TInt aInstrumentId);

Description

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

Parameters

TInt aCustomBankId Identifier of the custom sound bank containing the instrument to unload, occupying no more than 14 bits. TInt aInstrumentId Identifier of the instrument to unload. 0 <= aInstrumentId <= 127

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

Description

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

Parameters

TInt aNote Note to query. 0 <= aNote <= 127 TInt 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. TBool aCustom Specifies whether to reference a custom or standard sound bank TInt aInstrumentId Identifier of an instrument

Return value

HBufC * Descriptor containing the name of the percussion key. If the key does not have a name then an empty descriptor is returned

IMPORT_C void StopTimeL(TTimeIntervalMicroSeconds &aStopTime) const;

Description

Get the stop time currently set for the MIDI resource

Parameters

TTimeIntervalMicroSeconds &aStopTime Time at which playback will stop, relative to the start of the resource

IMPORT_C void SetStopTimeL(const TTimeIntervalMicroSeconds &aStopTime);

Description

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

Parameters

const TTimeIntervalMicroSeconds &aStopTime Time at which playback will stop, relative to the start of the resource. Clamped to 0 and the duration of the resource

IMPORT_C void SetRepeatsL(TInt aRepeatNumberOfTimes, const TTimeIntervalMicroSeconds &aTrailingSilence);

Description

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

Parameters

TInt aRepeatNumberOfTimes Number of time to repeat the resource during playback. This includes the first playing const TTimeIntervalMicroSeconds &aTrailingSilence Time in microseconds to pause between repeats

IMPORT_C TInt GetRepeats() const;

Description

Gets the number of times the current opened resources has to be repeated

Return value

TInt The number of time the current opened resources has to be repeated

IMPORT_C TInt PolyphonyL() const;

Description

Gets the number of currently active voices.

Return value

TInt The number of currently active voices

IMPORT_C void SetMaxPolyphonyL(TInt aMaxNotes);

Description

Set the max polyphony the engine can handle

Parameters

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

IMPORT_C TInt ChannelsSupportedL() const;

Description

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

Return value

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

IMPORT_C TReal32 ChannelVolumeL(TInt aChannel) const;

Description

Get the current volume setting of a logical channel

Parameters

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

Return value

TReal32 Volume currently set on the specified channel in decibels

IMPORT_C TReal32 MaxChannelVolumeL() const;

Description

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

Return value

TReal32 Maximum volume setting. Minimum value is -infinity dB, which is the smallest possible value that TReal32 supports.

IMPORT_C void SetChannelVolumeL(TInt aChannel, TReal32 aVolumeInDecibels);

Description

Set the volume of a channel.

Parameters

TInt aChannel Logical channel to set the volume on. 0 <= aChannel <= 15 TReal32 aVolumeInDecibels Volume currently set on the specified channel in decibels. The minimum channel volume supported value is -infinity dB, which is the smallest possible value that TReal32 supports. The maximum channel volume can be set via MaxChannelVolumeL()

IMPORT_C void SetChannelMuteL(TInt aChannel, TBool aMuted);

Description

Set the muting state of a channel without changing its volume setting. When unmuted the channel goes back to its previous volume setting

Parameters

TInt aChannel Logical channel to set the mute state of. 0 <= aChannel <= 15. TBool aMuted ETrue to mute the channel, EFalse to unmute it.

IMPORT_C TInt VolumeL() const;

Description

Gets the overall volume of the MIDI client.

Return value

TInt The current overall volume setting

IMPORT_C TInt MaxVolumeL() const;

Description

Maximum volume setting that may be applied overall.

Return value

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

IMPORT_C void SetVolumeL(TInt aVolume);

Description

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 is (overall volume * channel volume / max volume).

Parameters

TInt aVolume Overall volume setting to use

IMPORT_C void SetVolumeRampL(const TTimeIntervalMicroSeconds &aRampDuration);

Description

Length of time over which the volume is faded up from zero to the current settings when playback is started.

Parameters

const TTimeIntervalMicroSeconds &aRampDuration Duration of the ramping period.

IMPORT_C TInt GetBalanceL() const;

Description

Get the current stereo balance value

Return value

TInt Balance value ranging from KMMFBalanceMaxLeft to KMMFBalanceMaxRight

IMPORT_C void SetBalanceL(TInt aBalance=KMMFBalanceCenter);

Description

Set the current stereo balance value

Parameters

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

Capability:

MultimediaDD

A process requesting or using this method that has MultimediaDD capability will always have precedence over a process that does not have MultimediaDD.

IMPORT_C void SetPriorityL(TInt aPriority, TMdaPriorityPreference aPref);

Description

Set the priority with which this client plays MIDI data

Parameters

TInt aPriority Priority at which the MIDI playback should operate TMdaPriorityPreference aPref Priority preference to use if there should be contention with another client

IMPORT_C TInt NumberOfMetaDataEntriesL() const;

Description

Get the number of meta data entries currently known about in the currently open resource. XMF,SMF meta data are part of the XMF,SMF file header and can thus be examined before playback. If there is no XMF,SMF resource open, will return zero. Standard MIDI file meta data entries encountered during playback will be passed back via MMIDIClientUtilityObserver::MmcuoMetaDataEntryFound()

Return value

TInt Number of XMF meta data entries currently known about

IMPORT_C CMMFMetaDataEntry *GetMetaDataEntryL(TInt aMetaDataIndex) const;

Description

Retrieve the specified XMF,SMF meta data entry.

Parameters

TInt aMetaDataIndex Index of the meta data entry to retrieve

Return value

CMMFMetaDataEntry * Meta data entry. Ownership is passed to the client.

IMPORT_C void SetBankL(TBool aCustom);

Description

Parameters

TBool aCustom

IMPORT_C TBool IsTrackMuteL(TInt aTrack) const;

Description

Gets the muting status of a specific track

Parameters

TInt aTrack The track to query

Return value

TBool The mute status of the track.

IMPORT_C TBool IsChannelMuteL(TInt aChannel) const;

Description

Gets the muting status of a specific channel

Parameters

TInt aChannel The channel to query

Return value

TBool The mute status of the channel

IMPORT_C void CustomCommandSyncL(const TMMFMessageDestinationPckg &aDestination, TInt aFunction, const TDesC8 &aDataTo1, const TDesC8 &aDataTo2, TDes8 &aDataFrom);

Description

Synchronously pass implementation-specific commands to the MIDI engine and receive a response

Parameters

const TMMFMessageDestinationPckg &aDestination Recipient of the message. Should be initialised with KUidInterfaceMIDI and a TInt describing the server-side object to which the command should be delivered. The TInt will usually be KMMFObjectHandleController, to deliver the message to the controller plugin, which is the default value. TInt aFunction Index of the function to perform const TDesC8 &aDataTo1 First command data buffer to send, eg command parameters const TDesC8 &aDataTo2 Second command data buffer to send, eg data parameters TDes8 &aDataFrom Buffer to receive data in response to the command. The user must ensure that it is large enough to hold all the data returned.

IMPORT_C void CustomCommandSyncL(const TMMFMessageDestinationPckg &aDestination, TInt aFunction, const TDesC8 &aDataTo1, const TDesC8 &aDataTo2);

Description

Synchronously pass implementation-specific commands to the MIDI engine.

Parameters

const TMMFMessageDestinationPckg &aDestination Recipient of the message. Should be initialised with KUidInterfaceMIDI and a TInt describing the server-side object to which the command should be delivered. The TInt will usually be KMMFObjectHandleController, to deliver the message to the controller plugin, which is the default value. TInt aFunction Index of the function to perform const TDesC8 &aDataTo1 First command data buffer to send, eg command parameters const TDesC8 &aDataTo2 Second command data buffer to send, eg data parameters

IMPORT_C void CustomCommandAsync(const TMMFMessageDestinationPckg &aDestination, TInt aFunction, const TDesC8 &aDataTo1, const TDesC8 &aDataTo2, TDes8 &aDataFrom, TRequestStatus &aStatus);

Description

Asynchronously pass implementation-specific commands to the MIDI engine and receive a response

Parameters

const TMMFMessageDestinationPckg &aDestination aDestination Recipient of the message. Should be initialised with KUidInterfaceMIDI and a TInt describing the server-side object to which the command should be delivered. The TInt will usually be KMMFObjectHandleController, to deliver the message to the controller plugin, which is the default value. TInt aFunction Index of the function to perform const TDesC8 &aDataTo1 First command data buffer to send, eg command parameters const TDesC8 &aDataTo2 Second command data buffer to send, eg data parameters TDes8 &aDataFrom Buffer to receive data in response to the command. The user must ensure that it is large enough to hold all the data returned. TRequestStatus &aStatus Status flag belonging to an active object that will have it's RunL() called when this request complete

IMPORT_C void CustomCommandAsync(const TMMFMessageDestinationPckg &aDestination, TInt aFunction, const TDesC8 &aDataTo1, const TDesC8 &aDataTo2, TRequestStatus &aStatus);

Description

Asynchronously pass implementation-specific commands to the MIDI engine

Parameters

const TMMFMessageDestinationPckg &aDestination aDestination Recipient of the message. Should be initialised with KUidInterfaceMIDI and a TInt describing the server-side object to which the command should be delivered. The TInt will usually be KMMFObjectHandleController, to deliver the message to the controller plugin, which is the default value. TInt aFunction Index of the function to perform const TDesC8 &aDataTo1 First command data buffer to send, eg command parameters const TDesC8 &aDataTo2 Second command data buffer to send, eg data parameters TRequestStatus &aStatus Status flag belonging to an active object that will have it's RunL() called when this request complete

IMPORT_C TInt MaxPolyphonyL() const;

Description

Get the maximum polyphony level that the engine can handle

Return value

TInt The maximum number of simultaneous notes the engine can handle. 0 <= PolyphonyL() <= MaxPolyphonyL()

IMPORT_C MMMFDRMCustomCommand *GetDRMCustomCommand();

Description

Gets a controller's DRM custom command implementation.

Return value

MMMFDRMCustomCommand * A pointer to a controller's DRM custom command implementation or NULL if the interface can not be obtained