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livetrax/libs/surfaces/generic_midi/generic_midi_control_protocol.cc

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/*
Copyright (C) 2006 Paul 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 <algorithm>
#include <pbd/error.h>
#include <pbd/failed_constructor.h>
#include <midi++/port.h>
#include <midi++/manager.h>
#include <midi++/port_request.h>
#include <ardour/route.h>
#include <ardour/session.h>
#include "generic_midi_control_protocol.h"
#include "midicontrollable.h"
using namespace ARDOUR;
using namespace PBD;
#include "i18n.h"
GenericMidiControlProtocol::GenericMidiControlProtocol (Session& s)
: ControlProtocol (s, _("GenericMIDI"))
{
MIDI::Manager* mm = MIDI::Manager::instance();
/* XXX it might be nice to run "control" through i18n, but thats a bit tricky because
the name is defined in ardour.rc which is likely not internationalized.
*/
_port = mm->port (X_("control"));
if (_port == 0) {
error << _("no MIDI port named \"control\" exists - generic MIDI control disabled") << endmsg;
throw failed_constructor();
}
_feedback_interval = 10000; // microseconds
last_feedback_time = 0;
Controllable::StartLearning.connect (mem_fun (*this, &GenericMidiControlProtocol::start_learning));
Controllable::StopLearning.connect (mem_fun (*this, &GenericMidiControlProtocol::stop_learning));
Session::SendFeedback.connect (mem_fun (*this, &GenericMidiControlProtocol::send_feedback));
}
GenericMidiControlProtocol::~GenericMidiControlProtocol ()
{
}
int
GenericMidiControlProtocol::set_active (bool yn)
{
/* start/stop delivery/outbound thread */
return 0;
}
void
GenericMidiControlProtocol::set_feedback_interval (microseconds_t ms)
{
_feedback_interval = ms;
}
void
GenericMidiControlProtocol::send_feedback ()
{
microseconds_t now = get_microseconds ();
if (last_feedback_time != 0) {
if ((now - last_feedback_time) < _feedback_interval) {
return;
}
}
_send_feedback ();
last_feedback_time = now;
}
void
GenericMidiControlProtocol::_send_feedback ()
{
const int32_t bufsize = 16 * 1024;
MIDI::byte buf[bufsize];
int32_t bsize = bufsize;
MIDI::byte* end = buf;
for (MIDIControllables::iterator r = controllables.begin(); r != controllables.end(); ++r) {
end = (*r)->write_feedback (end, bsize);
}
if (end == buf) {
return;
}
_port->write (buf, (int32_t) (end - buf));
}
bool
GenericMidiControlProtocol::start_learning (Controllable* c)
{
if (c == 0) {
return false;
}
MIDIControllable* mc = new MIDIControllable (*_port, *c);
{
Glib::Mutex::Lock lm (pending_lock);
std::pair<MIDIControllables::iterator,bool> result;
result = pending_controllables.insert (mc);
if (result.second) {
c->LearningFinished.connect (bind (mem_fun (*this, &GenericMidiControlProtocol::learning_stopped), mc));
}
}
mc->learn_about_external_control ();
return true;
}
void
GenericMidiControlProtocol::learning_stopped (MIDIControllable* mc)
{
Glib::Mutex::Lock lm (pending_lock);
Glib::Mutex::Lock lm2 (controllables_lock);
MIDIControllables::iterator i = find (pending_controllables.begin(), pending_controllables.end(), mc);
if (i != pending_controllables.end()) {
pending_controllables.erase (i);
}
controllables.insert (mc);
}
void
GenericMidiControlProtocol::stop_learning (Controllable* c)
{
Glib::Mutex::Lock lm (pending_lock);
/* learning timed out, and we've been told to consider this attempt to learn to be cancelled. find the
relevant MIDIControllable and remove it from the pending list.
*/
for (MIDIControllables::iterator i = pending_controllables.begin(); i != pending_controllables.end(); ++i) {
if (&(*i)->get_controllable() == c) {
(*i)->stop_learning ();
delete (*i);
pending_controllables.erase (i);
break;
}
}
}
XMLNode&
GenericMidiControlProtocol::get_state ()
{
XMLNode* node = new XMLNode (_name); /* node name must match protocol name */
XMLNode* children = new XMLNode (X_("controls"));
node->add_child_nocopy (*children);
Glib::Mutex::Lock lm2 (controllables_lock);
for (MIDIControllables::iterator i = controllables.begin(); i != controllables.end(); ++i) {
children->add_child_nocopy ((*i)->get_state());
}
return *node;
}
int
GenericMidiControlProtocol::set_state (const XMLNode& node)
{
XMLNodeList nlist;
XMLNodeConstIterator niter;
Controllable* c;
{
Glib::Mutex::Lock lm (pending_lock);
pending_controllables.clear ();
}
Glib::Mutex::Lock lm2 (controllables_lock);
controllables.clear ();
nlist = node.children();
if (nlist.empty()) {
return 0;
}
nlist = nlist.front()->children ();
for (niter = nlist.begin(); niter != nlist.end(); ++niter) {
XMLProperty* prop;
if ((prop = (*niter)->property ("id")) != 0) {
ID id = prop->value ();
c = session->controllable_by_id (id);
if (c) {
MIDIControllable* mc = new MIDIControllable (*_port, *c);
if (mc->set_state (**niter) == 0) {
controllables.insert (mc);
}
}
}
}
return 0;
}