Jack2
1.9.9
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#include <JackMidiRawOutputWriteQueue.h>
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) |
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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 | |
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enum | EnqueueResult { BUFFER_FULL, BUFFER_TOO_SMALL, EVENT_EARLY, EN_ERROR, OK } |
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.
JackMidiRawOutputWriteQueue::JackMidiRawOutputWriteQueue | ( | JackMidiSendQueue * | send_queue, |
size_t | non_rt_size = 4096 , |
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size_t | max_non_rt_messages = 1024 , |
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size_t | max_rt_messages = 128 |
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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.
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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.
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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.