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/*
Copyright (C) 1998-99 Paul Barton-Davis
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#ifndef __libmidi_port_h__
#define __libmidi_port_h__
#include <string>
#include <sigc++/sigc++.h>
#include <pbd/selectable.h>
#include <midi++/types.h>
#include <midi++/parser.h>
namespace MIDI {
class Channel;
class PortRequest;
class Port : public sigc::trackable {
public:
enum Type {
Unknown,
JACK_Midi,
ALSA_RawMidi,
ALSA_Sequencer,
CoreMidi_MidiPort,
Null,
FIFO
};
Port (PortRequest &);
virtual ~Port ();
// FIXME: make Manager a friend of port so these can be hidden?
/* Only for use by MidiManager. Don't ever call this. */
virtual void cycle_start(nframes_t nframes);
/* Only for use by MidiManager. Don't ever call this. */
virtual void cycle_end();
/* Direct I/O */
/** Read a message from port.
* @param buf Raw MIDI message to send
* @param max Max size to write to @a buf
* @param timestamp Time stamp in frames of this message (relative to cycle start)
* @return number of bytes successfully written to \a buf
*/
virtual int read(byte *buf, size_t max, timestamp_t timestamp) = 0;
/** Write a message to port.
* @param msg Raw MIDI message to send
* @param msglen Size of @a msg
* @param timestamp Time stamp in frames of this message (relative to cycle start)
* @return number of bytes successfully written
*/
virtual int write(byte *msg, size_t msglen, timestamp_t timestamp) = 0;
/** Write a message to port.
* @return true on success.
* FIXME: describe semantics here
*/
bool midimsg (byte *msg, size_t len, timestamp_t timestamp) {
return !(write (msg, len, timestamp) == (int) len);
}
bool clock (timestamp_t timestamp);
/** Slow down I/O to a loop of single byte emissions
* interspersed with a busy loop of 10000 * this value.
*
* This may be ignored by a particular instance of this virtual
* class. See FD_MidiPort for an example of where it used. */
void set_slowdown (size_t n) { slowdown = n; }
/* select(2)/poll(2)-based I/O */
/** Get the file descriptor for port.
* @return File descriptor, or -1 if not selectable. */
virtual int selectable() const = 0;
Channel *channel (channel_t chn) {
return _channel[chn&0x7F];
}
Parser *input() { return input_parser; }
Parser *output() { return output_parser; }
void iostat (int *written, int *read,
const size_t **in_counts,
const size_t **out_counts) {
*written = bytes_written;
*read = bytes_read;
if (input_parser) {
*in_counts = input_parser->message_counts();
} else {
*in_counts = 0;
}
if (output_parser) {
*out_counts = output_parser->message_counts();
} else {
*out_counts = 0;
}
}
bool clock ();
const char *device () const { return _devname.c_str(); }
const char *name () const { return _tagname.c_str(); }
Type type () const { return _type; }
int mode () const { return _mode; }
bool ok () const { return _ok; }
size_t number () const { return _number; }
protected:
bool _ok;
bool _currently_in_cycle;
nframes_t _nframes_this_cycle;
Type _type;
std::string _devname;
std::string _tagname;
int _mode;
size_t _number;
Channel *_channel[16];
sigc::connection thru_connection;
unsigned int bytes_written;
unsigned int bytes_read;
Parser *input_parser;
Parser *output_parser;
size_t slowdown;
private:
static size_t nports;
};
} // namespace MIDI
#endif // __libmidi_port_h__
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