ARDOUR::ProtoPort Class Reference

#include <port_engine.h>

Inheritance diagram for ARDOUR::ProtoPort:

Public Member Functions
	ProtoPort ()
virtual	~ProtoPort ()

Detailed Description

PortEngine is an abstract base class that defines the functionality required by Ardour.

A Port is basically an endpoint for a datastream (which can either be continuous, like audio, or event-based, like MIDI). Ports have buffers associated with them into which data can be written (if they are output ports) and from which data can be read (if they input ports). Ports can be connected together so that data written to an output port can be read from an input port. These connections can be 1:1, 1:N OR N:1.

Ports may be associated with software only, or with hardware. Hardware related ports are often referred to as physical, and correspond to some relevant physical entity on a hardware device, such as an audio jack or a MIDI connector. Physical ports may be potentially asked to monitor their inputs, though some implementations may not support this.

Most physical ports will also be considered "terminal", which means that data delivered there or read from there will go to or comes from a system outside of the PortEngine implementation's control (e.g. the analog domain for audio, or external MIDI devices for MIDI). Non-physical ports can also be considered "terminal". For example, the output port of a software synthesizer is a terminal port, because the data contained in its buffer does not and cannot be considered to come from any other port - it is synthesized by its owner.

Ports also have latency associated with them. Each port has a playback latency and a capture latency:

capture latency: how long since the data read from the buffer of a port arrived at at a terminal port. The data will have come from the "outside world" if the terminal port is also physical, or will have been synthesized by the entity that owns the terminal port.

playback latency: how long until the data written to the buffer of port will reach a terminal port.

For more detailed questions about the PortEngine API, consult the JACK API documentation, on which this entire object is based.

Definition at line 77 of file port_engine.h.

Constructor & Destructor Documentation

ProtoPort()

ARDOUR::ProtoPort::ProtoPort ( )

inline

Definition at line 79 of file port_engine.h.

~ProtoPort()

virtual ARDOUR::ProtoPort::~ProtoPort ( )

inlinevirtual

Definition at line 80 of file port_engine.h.

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

• port_engine.h