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livetrax/libs/ardour/automation_watch.cc

205 lines
5.9 KiB
C++

/*
Copyright (C) 2012 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.
*/
#include <iostream>
#include <glibmm/timer.h>
#include "pbd/compose.h"
#include "ardour/automation_control.h"
#include "ardour/automation_watch.h"
#include "ardour/debug.h"
#include "ardour/session.h"
using namespace ARDOUR;
using namespace PBD;
AutomationWatch* AutomationWatch::_instance = 0;
AutomationWatch&
AutomationWatch::instance ()
{
if (_instance == 0) {
_instance = new AutomationWatch;
}
return *_instance;
}
AutomationWatch::AutomationWatch ()
: _thread (0)
, _last_time (0)
, _run_thread (false)
{
}
AutomationWatch::~AutomationWatch ()
{
if (_thread) {
_run_thread = false;
_thread->join ();
_thread = 0;
}
Glib::Threads::Mutex::Lock lm (automation_watch_lock);
automation_watches.clear ();
}
void
AutomationWatch::add_automation_watch (boost::shared_ptr<AutomationControl> ac)
{
Glib::Threads::Mutex::Lock lm (automation_watch_lock);
DEBUG_TRACE (DEBUG::Automation, string_compose ("now watching control %1 for automation, astate = %2\n", ac->name(), enum_2_string (ac->automation_state())));
automation_watches.insert (ac);
/* if an automation control is added here while the transport is
* rolling, make sure that it knows that there is a write pass going
* on, rather than waiting for the transport to start.
*/
if (_session && _session->transport_rolling() && ac->alist()->automation_write()) {
DEBUG_TRACE (DEBUG::Automation, string_compose ("\ttransport is rolling @ %1, audible = %2so enter write pass\n",
_session->transport_speed(), _session->audible_frame()));
/* add a guard point since we are already moving */
ac->list()->set_in_write_pass (true, true, _session->audible_frame());
}
/* we can't store shared_ptr<Destructible> in connections because it
* creates reference cycles. we don't need to make the weak_ptr<>
* explicit here, but it helps to remind us what is going on.
*/
boost::weak_ptr<AutomationControl> wac (ac);
ac->DropReferences.connect_same_thread (*this, boost::bind (&AutomationWatch::remove_weak_automation_watch, this, wac));
}
void
AutomationWatch::remove_weak_automation_watch (boost::weak_ptr<AutomationControl> wac)
{
boost::shared_ptr<AutomationControl> ac = wac.lock();
if (!ac) {
return;
}
remove_automation_watch (ac);
}
void
AutomationWatch::remove_automation_watch (boost::shared_ptr<AutomationControl> ac)
{
Glib::Threads::Mutex::Lock lm (automation_watch_lock);
DEBUG_TRACE (DEBUG::Automation, string_compose ("remove control %1 from automation watch\n", ac->name()));
automation_watches.erase (ac);
ac->list()->set_in_write_pass (false);
}
gint
AutomationWatch::timer ()
{
if (!_session || !_session->transport_rolling()) {
return TRUE;
}
{
Glib::Threads::Mutex::Lock lm (automation_watch_lock);
framepos_t time = _session->audible_frame ();
if (time > _last_time) { //we only write automation in the forward direction; this fixes automation-recording in a loop
for (AutomationWatches::iterator aw = automation_watches.begin(); aw != automation_watches.end(); ++aw) {
if ((*aw)->alist()->automation_write()) {
(*aw)->list()->add (time, (*aw)->user_double(), true);
}
}
} else if (time != _last_time) { //transport stopped or reversed. stop the automation pass and start a new one (for bonus points, someday store the previous pass in an undo record)
for (AutomationWatches::iterator aw = automation_watches.begin(); aw != automation_watches.end(); ++aw) {
DEBUG_TRACE (DEBUG::Automation, string_compose ("%1: transport in rewind, speed %2, in write pass ? %3 writing ? %4\n",
(*aw)->name(), _session->transport_speed(), _session->transport_rolling(),
(*aw)->alist()->automation_write()));
(*aw)->list()->set_in_write_pass (false);
if ( (*aw)->alist()->automation_write() ) {
(*aw)->list()->set_in_write_pass (true, time);
}
}
}
_last_time = time;
}
return TRUE;
}
void
AutomationWatch::thread ()
{
while (_run_thread) {
Glib::usleep ((gulong) floor (Config->get_automation_interval_msecs() * 1000));
timer ();
}
}
void
AutomationWatch::set_session (Session* s)
{
transport_connection.disconnect ();
if (_thread) {
_run_thread = false;
_thread->join ();
_thread = 0;
}
SessionHandlePtr::set_session (s);
if (_session) {
_run_thread = true;
_thread = Glib::Threads::Thread::create (boost::bind (&AutomationWatch::thread, this));
_session->TransportStateChange.connect_same_thread (transport_connection, boost::bind (&AutomationWatch::transport_state_change, this));
}
}
void
AutomationWatch::transport_state_change ()
{
if (!_session) {
return;
}
bool rolling = _session->transport_rolling();
_last_time = _session->audible_frame ();
{
Glib::Threads::Mutex::Lock lm (automation_watch_lock);
for (AutomationWatches::iterator aw = automation_watches.begin(); aw != automation_watches.end(); ++aw) {
DEBUG_TRACE (DEBUG::Automation, string_compose ("%1: transport state changed, speed %2, in write pass ? %3 writing ? %4\n",
(*aw)->name(), _session->transport_speed(), rolling,
(*aw)->alist()->automation_write()));
if (rolling && (*aw)->alist()->automation_write()) {
(*aw)->list()->set_in_write_pass (true);
} else {
(*aw)->list()->set_in_write_pass (false);
}
}
}
}