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schoenebeck |
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/* |
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Copyright (C) 2008 Christian Schoenebeck |
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*/ |
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#ifndef LS_VIRTUALMIDIDEVICE_H |
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#define LS_VIRTUALMIDIDEVICE_H |
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#include "../../common/global.h" |
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namespace LinuxSampler { |
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/** |
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* Light-weight MIDI interface (for MIDI in & out) intended to be used by |
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* pure software MIDI "devices", that is e.g. a graphical virtual MIDI |
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* keyboard in an instrument editor or in a sampler frontend. This class |
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* should not be used for regular MIDI input device drivers for the sampler. |
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* This primitive interface by design doesn't care about jitter, fast event |
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* delivery or masses and masses of events in a short time! |
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*/ |
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class VirtualMidiDevice { |
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public: |
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enum event_type_t { |
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EVENT_TYPE_NOTEON = 1, |
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EVENT_TYPE_NOTEOFF = 2 |
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}; |
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struct event_t { |
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event_type_t Type; |
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uint8_t Key; |
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uint8_t Velocity; |
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}; |
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///////////////////////////////////////////////////////////////// |
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// Device methods |
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// (called by the VirtualMidiDevice implementation) |
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/** |
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* Sends a MIDI @e note @e on event to the sampler. |
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* |
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* @returns true on success, false if internal FIFO full |
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* (or provided values invalid) |
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*/ |
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bool SendNoteOnToSampler(uint8_t Key, uint8_t Velocity); |
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/** |
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* Sends a MIDI @e note @e off event to the sampler. |
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* |
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* @returns true on success, false if internal FIFO full |
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* (or provided values invalid) |
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*/ |
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bool SendNoteOffToSampler(uint8_t Key, uint8_t Velocity); |
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/** |
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* Can be called by the virtual MIDI device to check whether a new note |
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* on or note off MIDI event arrived to the sampler during the last |
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* call to this method. So this is a asynchronously, "polling" based |
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* communication mechanism, which works in conjunction with the |
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* NoteIsActive() method call. |
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*/ |
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bool NotesChanged(); |
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/** |
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* Can be called by the virtual MIDI device to check whether a new note |
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* on or note off MIDI event arrived to the sampler for @a Key during |
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* the last call to this method. So this is a asynchronously, |
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* "polling" based communication mechanism, which works in |
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* conjunction with the NoteIsActive() method call. |
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*/ |
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bool NoteChanged(uint8_t Key); |
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/** |
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* Can be called by the virtual MIDI device to check which key / note |
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* is currently active by the sampler, e.g. to highlight the |
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* respective keys on a graphical virtual keyboard. |
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* |
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* @see NotesChanged(), NoteChanged() |
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*/ |
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bool NoteIsActive(uint8_t Key); |
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schoenebeck |
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/** |
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* Returns the velocity of the @e last note on event. No FIFO is used! |
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*/ |
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uint8_t NoteOnVelocity(uint8_t Key); |
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/** |
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* Returns the velocity of the @e last note off event. No FIFO is used! |
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*/ |
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uint8_t NoteOffVelocity(uint8_t Key); |
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schoenebeck |
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///////////////////////////////////////////////////////////////// |
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// Sampler methods |
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// (usually only called by the Sampler) |
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/** |
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* Informs the virtual MIDI device that a @e note @e on event occured |
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* (e.g. caused by a MIDI keyboard connected to the sampler). |
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* Communication acts asynchronously, that is this method call doesn't |
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* lock in any way and returns immediately. It is thus realtime safe. |
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* |
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* @e Note: this method is usually only called by the sampler. |
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* |
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* @see ActiveNotesChanged(), NoteIsActive() |
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*/ |
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void SendNoteOnToDevice(uint8_t Key, uint8_t Velocity); |
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/** |
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* Informs the virtual MIDI device that a @e note @e off event occured |
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* (e.g. caused by a MIDI keyboard connected to the sampler). |
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* Communication acts asynchronously, that is this method call doesn't |
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* lock in any way and returns immediately. It is thus realtime safe. |
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* |
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* @e Note: this method is usually only called by the sampler. |
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* |
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* @see ActiveNotesChanged(), NoteIsActive() |
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*/ |
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void SendNoteOffToDevice(uint8_t Key, uint8_t Velocity); |
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/** |
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* Gets the next pending MIDI event from the virtual MIDI device by |
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* using a lockfree FIFO. |
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* |
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* @e Note: this method is usually only called by the sampler. |
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* |
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* @param Event - destination for writing the next event to |
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* @returns true on success, false if no event pending |
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*/ |
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bool GetMidiEventFromDevice(event_t& Event); |
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/** |
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* Constructor |
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*/ |
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VirtualMidiDevice(); |
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/** |
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* Destructor |
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*/ |
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virtual ~VirtualMidiDevice(); |
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private: |
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void* pPrivateData; |
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}; |
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} // namespace LinuxSampler |
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#endif // LS_VIRTUALMIDIDEVICE_H |