2 Copyright (C) 2013 Paul Davis
4 This program is free software; you can redistribute it and/or modify
5 it under the terms of the GNU General Public License as published by
6 the Free Software Foundation; either version 2 of the License, or
7 (at your option) any later version.
9 This program is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 GNU General Public License for more details.
14 You should have received a copy of the GNU General Public License
15 along with this program; if not, write to the Free Software
16 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
20 #ifndef __libardour_port_engine_h__
21 #define __libardour_port_engine_h__
28 #include "ardour/data_type.h"
29 #include "ardour/types.h"
33 /** PortEngine is an abstract base class that defines the functionality
36 * A Port is basically an endpoint for a datastream (which can either be
37 * continuous, like audio, or event-based, like MIDI). Ports have buffers
38 * associated with them into which data can be written (if they are output
39 * ports) and from which data can be read (if they input ports). Ports can be
40 * connected together so that data written to an output port can be read from
41 * an input port. These connections can be 1:1, 1:N OR N:1.
43 * Ports may be associated with software only, or with hardware. Hardware
44 * related ports are often referred to as physical, and correspond to some
45 * relevant physical entity on a hardware device, such as an audio jack or a
46 * MIDI connector. Physical ports may be potentially asked to monitor their
47 * inputs, though some implementations may not support this.
49 * Most physical ports will also be considered "terminal", which means that
50 * data delivered there or read from there will go to or comes from a system
51 * outside of the PortEngine implementation's control (e.g. the analog domain
52 * for audio, or external MIDI devices for MIDI). Non-physical ports can also
53 * be considered "terminal". For example, the output port of a software
54 * synthesizer is a terminal port, because the data contained in its buffer
55 * does not and cannot be considered to come from any other port - it is
56 * synthesized by its owner.
58 * Ports also have latency associated with them. Each port has a playback
59 * latency and a capture latency:
61 * <b>capture latency</b>: how long since the data read from the buffer of a
62 * port arrived at at a terminal port. The data will have
63 * come from the "outside world" if the terminal port is also
64 * physical, or will have been synthesized by the entity that
65 * owns the terminal port.
67 * <b>playback latency</b>: how long until the data written to the buffer of
68 * port will reach a terminal port.
71 * For more detailed questions about the PortEngine API, consult the JACK API
72 * documentation, on which this entire object is based.
78 virtual ~PortEngine();
80 /* We use void* here so that the API can be defined for any implementation.
82 * We could theoretically use a template (PortEngine<T>) and define
83 * PortHandle as T, but this complicates the desired inheritance
84 * pattern in which FooPortEngine handles things for the Foo API,
85 * rather than being a derivative of PortEngine<Foo>.
88 typedef void* PortHandle;
90 virtual bool connected() const = 0;
91 virtual void* private_handle() const = 0;
93 virtual int set_port_name (PortHandle, const std::string&) = 0;
94 virtual std::string get_port_name (PortHandle) const = 0;
95 virtual PortHandle* get_port_by_name (const std::string&) const = 0;
97 DataType port_data_type (PortHandle) const;
99 virtual std::string make_port_name_relative (const std::string& name) const = 0;
100 virtual std::string make_port_name_non_relative (const std::string& name) const = 0;
101 virtual bool port_is_mine (const std::string& fullname) const = 0;
103 virtual PortHandle register_port (const std::string& shortname, ARDOUR::DataType, ARDOUR::PortFlags) = 0;
104 virtual void unregister_port (PortHandle) = 0;
106 virtual bool connected (PortHandle) = 0;
107 virtual bool connected_to (PortHandle, const std::string&) = 0;
108 virtual bool physically_connected (PortHandle) = 0;
110 virtual int get_connections (PortHandle, std::vector<std::string>&) = 0;
112 virtual int connect (PortHandle, const std::string&) = 0;
113 virtual int disconnect (PortHandle, const std::string&) = 0;
114 virtual int disconnect_all (PortHandle) = 0;
116 virtual int connect (const std::string& src, const std::string& dst) = 0;
117 virtual int disconnect (const std::string& src, const std::string& dst) = 0;
121 virtual void midi_event_get (pframes_t& timestamp, size_t& size, uint8_t** buf, void* port_buffer, uint32_t event_index) = 0;
122 virtual int midi_event_put (void* port_buffer, pframes_t timestamp, const uint8_t* buffer, size_t size) = 0;
123 virtual uint32_t get_midi_event_count (void* port_buffer);
124 virtual void midi_clear (void* port_buffer);
128 virtual bool can_monitor_input() const = 0;
129 virtual int request_input_monitoring (PortHandle, bool) = 0;
130 virtual int ensure_input_monitoring (PortHandle, bool) = 0;
131 virtual bool monitoring_input (PortHandle) = 0;
133 /* Latency management
136 virtual void set_latency_range (PortHandle, bool for_playback, LatencyRange) = 0;
137 virtual LatencyRange get_latency_range (PortHandle, bool for_playback) = 0;
138 virtual LatencyRange get_connected_latency_range (PortHandle, int dir) = 0;
140 virtual void* get_buffer (PortHandle, pframes_t) = 0;
142 virtual pframes_t last_frame_time () const = 0;
147 #endif /* __libardour_port_engine_h__ */