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livetrax/libs/midi++2/midiport.cc

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/*
Copyright (C) 1998 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.
$Id$
*/
#include <iostream>
#include <cstdio>
#include <fcntl.h>
#include <errno.h>
#include "pbd/xml++.h"
#include "pbd/error.h"
#include "pbd/failed_constructor.h"
#include "midi++/types.h"
#include "midi++/port.h"
#include "midi++/channel.h"
#include "midi++/factory.h"
using namespace MIDI;
using namespace std;
using namespace PBD;
size_t Port::nports = 0;
Port::Port (const XMLNode& node)
: _currently_in_cycle(false)
, _nframes_this_cycle(0)
{
Descriptor desc (node);
_ok = false; /* derived class must set to true if constructor
succeeds.
*/
bytes_written = 0;
bytes_read = 0;
input_parser = 0;
output_parser = 0;
slowdown = 0;
_devname = desc.device;
_tagname = desc.tag;
_mode = desc.mode;
if (_mode == O_RDONLY || _mode == O_RDWR) {
input_parser = new Parser (*this);
} else {
input_parser = 0;
}
if (_mode == O_WRONLY || _mode == O_RDWR) {
output_parser = new Parser (*this);
} else {
output_parser = 0;
}
for (int i = 0; i < 16; i++) {
_channel[i] = new Channel (i, *this);
if (input_parser) {
_channel[i]->connect_input_signals ();
}
if (output_parser) {
_channel[i]->connect_output_signals ();
}
}
}
Port::~Port ()
{
for (int i = 0; i < 16; i++) {
delete _channel[i];
}
}
void
Port::parse ()
{
byte buf[512];
/* parsing is done (if at all) by initiating a read from
the port.
*/
while (1) {
// cerr << "+++ READ ON " << name() << endl;
int nread = read (buf, sizeof (buf));
// cerr << "-- READ (" << nread << " ON " << name() << endl;
if (nread > 0) {
if ((size_t) nread < sizeof (buf)) {
break;
} else {
continue;
}
} else if (nread == 0) {
break;
} else if (errno == EAGAIN) {
break;
} else {
fatal << "Error reading from MIDI port " << name() << endmsg;
/*NOTREACHED*/
}
}
}
/** Send a clock tick message.
* \return true on success.
*/
bool
Port::clock (timestamp_t timestamp)
{
static byte clockmsg = 0xf8;
if (_mode != O_RDONLY) {
return midimsg (&clockmsg, 1, timestamp);
}
return false;
}
void
Port::cycle_start (nframes_t nframes)
{
_currently_in_cycle = true;
_nframes_this_cycle = nframes;
}
void
Port::cycle_end ()
{
_currently_in_cycle = false;
_nframes_this_cycle = 0;
}
XMLNode&
Port::get_state () const
{
XMLNode* node = new XMLNode ("MIDI-port");
node->add_property ("tag", _tagname);
node->add_property ("device", _devname);
node->add_property ("mode", PortFactory::mode_to_string (_mode));
node->add_property ("type", get_typestring());
return *node;
}
void
Port::set_state (const XMLNode& node)
{
// relax
}
void
Port::gtk_read_callback (void *ptr, int fd, int cond)
{
byte buf[64];
((Port *)ptr)->read (buf, sizeof (buf));
}
void
Port::write_callback (byte *msg, unsigned int len, void *ptr)
{
((Port *)ptr)->write (msg, len, 0);
}
std::ostream & MIDI::operator << ( std::ostream & os, const MIDI::Port & port )
{
using namespace std;
os << "MIDI::Port { ";
os << "device: " << port.device();
os << "; ";
os << "name: " << port.name();
os << "; ";
os << "type: " << port.type();
os << "; ";
os << "mode: " << port.mode();
os << "; ";
os << "ok: " << port.ok();
os << "; ";
os << " }";
return os;
}
Port::Descriptor::Descriptor (const XMLNode& node)
{
const XMLProperty *prop;
bool have_tag = false;
bool have_device = false;
bool have_type = false;
bool have_mode = false;
if ((prop = node.property ("tag")) != 0) {
tag = prop->value();
have_tag = true;
}
if ((prop = node.property ("device")) != 0) {
device = prop->value();
have_device = true;
}
if ((prop = node.property ("type")) != 0) {
type = PortFactory::string_to_type (prop->value());
have_type = true;
}
if ((prop = node.property ("mode")) != 0) {
mode = PortFactory::string_to_mode (prop->value());
have_mode = true;
}
if (!have_tag || !have_device || !have_type || !have_mode) {
throw failed_constructor();
}
}