Jack2  1.9.9
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Jack::JackMidiRawOutputWriteQueue Class Reference

#include <JackMidiRawOutputWriteQueue.h>

Inheritance diagram for Jack::JackMidiRawOutputWriteQueue:
Jack::JackMidiWriteQueue

Public Member Functions

 JackMidiRawOutputWriteQueue (JackMidiSendQueue *send_queue, size_t non_rt_size=4096, size_t max_non_rt_messages=1024, size_t max_rt_messages=128)
 
EnqueueResult EnqueueEvent (jack_nframes_t time, size_t size, jack_midi_data_t *buffer)
 
jack_nframes_t Process (jack_nframes_t boundary_frame=0)
 
- Public Member Functions inherited from Jack::JackMidiWriteQueue
EnqueueResult EnqueueEvent (jack_midi_event_t *event, jack_nframes_t frame_offset=0)
 

Protected Member Functions

virtual void HandleWriteQueueBug (jack_nframes_t time, jack_midi_data_t byte)
 

Additional Inherited Members

- Public Types inherited from Jack::JackMidiWriteQueue
enum  EnqueueResult {
  BUFFER_FULL, BUFFER_TOO_SMALL, EVENT_EARLY, EN_ERROR,
  OK
}
 

Detailed Description

This queue enqueues valid MIDI events and modifies them for raw output to a write queue. It has a couple of advantages over straight MIDI event copying:

-Running status: Status bytes can be omitted when the status byte of the current MIDI message is the same as the status byte of the last sent MIDI message.

-Realtime messages: Realtime messages are given priority over non-realtime messages. Realtime bytes are interspersed with non-realtime bytes so that realtime messages can be sent as close as possible to the time they're scheduled for sending.

Use this queue if the MIDI API you're interfacing with allows you to send raw MIDI bytes.

Definition at line 46 of file JackMidiRawOutputWriteQueue.h.

Constructor & Destructor Documentation

JackMidiRawOutputWriteQueue::JackMidiRawOutputWriteQueue ( JackMidiSendQueue send_queue,
size_t  non_rt_size = 4096,
size_t  max_non_rt_messages = 1024,
size_t  max_rt_messages = 128 
)

Called to create a new raw write queue. The send_queue argument is the queue to write raw bytes to. The optional max_rt_messages argument specifies the number of messages that can be enqueued in the internal realtime queue. The optional max_non_rt_messages argument specifies the number of messages that can be enqueued in the internal non-realtime queue. The optional non_rt_size argument specifies the total number of MIDI bytes that can be put in the non-realtime queue.

Definition at line 32 of file JackMidiRawOutputWriteQueue.cpp.

Member Function Documentation

void JackMidiRawOutputWriteQueue::HandleWriteQueueBug ( jack_nframes_t  time,
jack_midi_data_t  byte 
)
protectedvirtual

Override this method to specify what happens when the write queue says that a 1-byte event is too large for its buffer. Basically, this should never happen.

Definition at line 82 of file JackMidiRawOutputWriteQueue.cpp.

Jack::JackMidiWriteQueue::EnqueueResult JackMidiRawOutputWriteQueue::EnqueueEvent ( jack_nframes_t  time,
size_t  size,
jack_midi_data_t *  buffer 
)
virtual

Enqueues a data packet in the write queue of size bytes contained in buffer that will be sent the absolute time specified by time. This method should not block unless 1.) this write queue represents the actual outbound MIDI connection, 2.) the MIDI event is being sent now, meaning that time is less than or equal to now, and 3.) the method is not being called in the process thread. The method should return OK if the event was enqueued, BUFFER_FULL if the write queue isn't able to accept the event right now, BUFFER_TOO_SMALL if this write queue will never be able to accept the event because the event is too large, EVENT_EARLY if this queue cannot schedule events ahead of time, and EN_ERROR if an error occurs that cannot be specified by another return code.

Implements Jack::JackMidiWriteQueue.

Definition at line 73 of file JackMidiRawOutputWriteQueue.cpp.

jack_nframes_t JackMidiRawOutputWriteQueue::Process ( jack_nframes_t  boundary_frame = 0)

The Process() method should be called each time the EnqueueEvent() method returns 'OK'. The Process() method will return the next frame at which an event should be sent. The return value from Process() depends upon the result of writing bytes to the write queue:

-If the return value is '0', then all events that have been enqueued in this queue have been sent successfully to the write queue. Don't call Process() again until another event has been enqueued.

-If the return value is an earlier frame or the current frame, it means that the write queue returned 'BUFFER_FULL', 'ERROR', or 'EVENT_EARLY' when this queue attempted to send the next byte, and that the byte should have already been sent, or is scheduled to be sent now. Process() should be called again when the write queue can enqueue events again successfully. How to determine when this will happen is left up to the caller.

-If the return value is in the future, then Process() should be called again at that time, or after another event is enqueued.

Definition at line 92 of file JackMidiRawOutputWriteQueue.cpp.


The documentation for this class was generated from the following files: