add tim's jack_utils code to rationalize setup of JACK config
[ardour.git] / libs / ardour / track.cc
index ed52fd70a95cf1a608569d98caef96eb2d9a6343..c6a348ddfb1c4d7963b9a29239672f7323d76129 100644 (file)
@@ -1,5 +1,5 @@
 /*
-    Copyright (C) 2006 Paul Davis 
+    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
     along with this program; if not, write to the Free Software
     Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */
-#include <pbd/error.h>
-#include <sigc++/retype.h>
-#include <sigc++/retype_return.h>
-#include <sigc++/bind.h>
-
-#include <ardour/track.h>
-#include <ardour/diskstream.h>
-#include <ardour/session.h>
-#include <ardour/io_processor.h>
-#include <ardour/audioregion.h>
-#include <ardour/audiosource.h>
-#include <ardour/route_group_specialized.h>
-#include <ardour/processor.h>
-#include <ardour/audioplaylist.h>
-#include <ardour/panner.h>
-#include <ardour/utils.h>
+#include "pbd/error.h"
+
+#include "ardour/amp.h"
+#include "ardour/debug.h"
+#include "ardour/delivery.h"
+#include "ardour/diskstream.h"
+#include "ardour/io_processor.h"
+#include "ardour/meter.h"
+#include "ardour/playlist.h"
+#include "ardour/port.h"
+#include "ardour/processor.h"
+#include "ardour/route_group_specialized.h"
+#include "ardour/session.h"
+#include "ardour/session_playlists.h"
+#include "ardour/track.h"
+#include "ardour/utils.h"
 
 #include "i18n.h"
 
@@ -39,32 +39,49 @@ using namespace ARDOUR;
 using namespace PBD;
 
 Track::Track (Session& sess, string name, Route::Flag flag, TrackMode mode, DataType default_type)
-       : Route (sess, name, 1, -1, -1, -1, flag, default_type)
-       , _rec_enable_control (new RecEnableControllable(*this))
+       : Route (sess, name, flag, default_type)
+        , _saved_meter_point (_meter_point)
+        , _mode (mode)
+       , _monitoring (MonitorAuto)
 {
-       _declickable = true;
        _freeze_record.state = NoFreeze;
-       _saved_meter_point = _meter_point;
-       _mode = mode;
+        _declickable = true;
 }
 
-Track::Track (Session& sess, const XMLNode& node, DataType default_type)
-       : Route (sess, node)
-       , _rec_enable_control (new RecEnableControllable(*this))
+Track::~Track ()
 {
-       _freeze_record.state = NoFreeze;
-       _declickable = true;
-       _saved_meter_point = _meter_point;
+       DEBUG_TRACE (DEBUG::Destruction, string_compose ("track %1 destructor\n", _name));
 }
 
-Track::~Track ()
+int
+Track::init ()
 {
+        if (Route::init ()) {
+                return -1;
+        }
+
+       boost::shared_ptr<Route> rp (shared_from_this());
+       boost::shared_ptr<Track> rt = boost::dynamic_pointer_cast<Track> (rp);
+       _rec_enable_control = boost::shared_ptr<RecEnableControl> (new RecEnableControl(rt));
+       _rec_enable_control->set_flags (Controllable::Toggle);
+
+       /* don't add rec_enable_control to controls because we don't want it to
+        * appear as an automatable parameter
+        */
+
+        return 0;
 }
 
 void
-Track::set_meter_point (MeterPoint p, void *src)
+Track::use_new_diskstream ()
 {
-       Route::set_meter_point (p, src);
+       boost::shared_ptr<Diskstream> ds = create_diskstream ();
+
+       ds->do_refill_with_alloc ();
+       ds->set_block_size (_session.get_block_size ());
+       ds->playlist()->set_orig_track_id (id());
+
+       set_diskstream (ds);
 }
 
 XMLNode&
@@ -74,48 +91,75 @@ Track::get_state ()
 }
 
 XMLNode&
-Track::get_template ()
+Track::state (bool full)
 {
-       return state (false);
-}
+       XMLNode& root (Route::state (full));
+       root.add_property (X_("monitoring"), enum_2_string (_monitoring));
+       root.add_property (X_("saved-meter-point"), enum_2_string (_saved_meter_point));
+       root.add_child_nocopy (_rec_enable_control->get_state());
+       root.add_child_nocopy (_diskstream->get_state ());
+       
+       return root;
+}      
 
-void
-Track::toggle_monitor_input ()
+int
+Track::set_state (const XMLNode& node, int version)
 {
-       for (PortSet::iterator i = _inputs.begin(); i != _inputs.end(); ++i) {
-               i->ensure_monitor_input(!i->monitoring_input());
+       if (Route::set_state (node, version)) {
+               return -1;
        }
-}
 
-ARDOUR::nframes_t
-Track::update_total_latency ()
-{
-       nframes_t old = _own_latency;
+       XMLNode* child;
 
-       if (_user_latency) {
-               _own_latency = _user_latency;
-       } else {
-               _own_latency = 0;
+       if (version >= 3000) {
+               if ((child = find_named_node (node, X_("Diskstream"))) != 0) {
+                       boost::shared_ptr<Diskstream> ds = diskstream_factory (*child);
+                       ds->do_refill_with_alloc ();
+                       set_diskstream (ds);
+               }
+       }
 
-               for (ProcessorList::iterator i = _processors.begin(); i != _processors.end(); ++i) {
-                       if ((*i)->active ()) {
-                               _own_latency += (*i)->signal_latency ();
+       if (_diskstream) {
+               _diskstream->playlist()->set_orig_track_id (id());
+       }
+
+       /* set rec-enable control *AFTER* setting up diskstream, because it may
+          want to operate on the diskstream as it sets its own state
+       */
+
+       XMLNodeList nlist = node.children();
+       for (XMLNodeConstIterator niter = nlist.begin(); niter != nlist.end(); ++niter) {
+               child = *niter;
+
+               XMLProperty* prop;
+               if (child->name() == Controllable::xml_node_name && (prop = child->property ("name")) != 0) {
+                       if (prop->value() == X_("recenable")) {
+                               _rec_enable_control->set_state (*child, version);
                        }
                }
        }
+       
+       const XMLProperty* prop;
 
-#undef DEBUG_LATENCY
-#ifdef DEBUG_LATENCY
-       cerr << _name << ": internal redirect (final) latency = " << _own_latency << endl;
-#endif
-
-       set_port_latency (_own_latency);
+       if ((prop = node.property (X_("monitoring"))) != 0) {
+               _monitoring = MonitorChoice (string_2_enum (prop->value(), _monitoring));
+       } else {
+               _monitoring = MonitorAuto;
+       }
 
-       if (old != _own_latency) {
-               signal_latency_changed (); /* EMIT SIGNAL */
+       if ((prop = node.property (X_("saved-meter-point"))) != 0) {
+               _saved_meter_point = MeterPoint (string_2_enum (prop->value(), _saved_meter_point));
+       } else {
+               _saved_meter_point = _meter_point;
        }
 
-       return _own_latency;
+       return 0;
+}
+
+XMLNode&
+Track::get_template ()
+{
+       return state (false);
 }
 
 Track::FreezeRecord::~FreezeRecord ()
@@ -131,52 +175,67 @@ Track::freeze_state() const
        return _freeze_record.state;
 }
 
-Track::RecEnableControllable::RecEnableControllable (Track& s)
-       : Controllable (X_("recenable")), track (s)
+Track::RecEnableControl::RecEnableControl (boost::shared_ptr<Track> t)
+       : AutomationControl (t->session(), RecEnableAutomation, boost::shared_ptr<AutomationList>(), X_("recenable"))
+       , track (t)
 {
+       boost::shared_ptr<AutomationList> gl(new AutomationList(Evoral::Parameter(RecEnableAutomation)));
+       set_list (gl);
 }
 
 void
-Track::RecEnableControllable::set_value (float val)
+Track::RecEnableControl::set_value (double val)
 {
-       bool bval = ((val >= 0.5f) ? true: false);
-       track.set_record_enable (bval, this);
+       boost::shared_ptr<Track> t = track.lock ();
+       if (!t) {
+               return;
+       }
+       
+       t->set_record_enabled (val >= 0.5 ? true : false, this);
 }
 
-float
-Track::RecEnableControllable::get_value (void) const
+double
+Track::RecEnableControl::get_value () const
 {
-       if (track.record_enabled()) { return 1.0f; }
-       return 0.0f;
+       boost::shared_ptr<Track> t = track.lock ();
+       if (!t) {
+               return 0;
+       }
+       
+       return (t->record_enabled() ? 1.0 : 0.0);
 }
 
 bool
 Track::record_enabled () const
 {
-       return _diskstream->record_enabled ();
+       return _diskstream && _diskstream->record_enabled ();
 }
 
 bool
 Track::can_record()
 {
        bool will_record = true;
-       for (PortSet::iterator i = _inputs.begin(); i != _inputs.end() && will_record; ++i) {
+       for (PortSet::iterator i = _input->ports().begin(); i != _input->ports().end() && will_record; ++i) {
                if (!i->connected())
                        will_record = false;
        }
 
        return will_record;
 }
-       
+
 void
-Track::set_record_enable (bool yn, void *src)
+Track::prep_record_enabled (bool yn, void *src)
 {
+       if (!_session.writable()) {
+               return;
+       }
+
        if (_freeze_record.state == Frozen) {
                return;
        }
 
-       if (_mix_group && src != _mix_group && _mix_group->is_active()) {
-               _mix_group->apply (&Track::set_record_enable, yn, _mix_group);
+       if (_route_group && src != _route_group && _route_group->is_active() && _route_group->is_recenable()) {
+               _route_group->apply (&Track::prep_record_enabled, yn, _route_group);
                return;
        }
 
@@ -184,18 +243,46 @@ Track::set_record_enable (bool yn, void *src)
        if (!_diskstream->record_enabled()) {
                _saved_meter_point = _meter_point;
        }
-       
-       _diskstream->set_record_enabled (yn);
 
-       if (_diskstream->record_enabled()) {
-               set_meter_point (MeterInput, this);
+       bool will_follow;
+       
+       if (yn) {
+               will_follow = _diskstream->prep_record_enable ();
        } else {
-               set_meter_point (_saved_meter_point, this);
+               will_follow = _diskstream->prep_record_disable ();
        }
 
-       _rec_enable_control->Changed ();
+       if (will_follow) {
+               if (yn) {
+                       if (_meter_point != MeterCustom) {
+                               set_meter_point (MeterInput);
+                       }
+               } else {
+                       set_meter_point (_saved_meter_point);
+               }
+       }
 }
 
+void
+Track::set_record_enabled (bool yn, void *src)
+{
+       if (!_session.writable()) {
+               return;
+       }
+
+       if (_freeze_record.state == Frozen) {
+               return;
+       }
+
+       if (_route_group && src != _route_group && _route_group->is_active() && _route_group->is_recenable()) {
+               _route_group->apply (&Track::set_record_enabled, yn, _route_group);
+               return;
+       }
+
+       _diskstream->set_record_enabled (yn);
+
+       _rec_enable_control->Changed ();
+}
 
 bool
 Track::set_name (const string& str)
@@ -207,13 +294,25 @@ Track::set_name (const string& str)
                return false;
        }
 
-       if (_diskstream->set_name (str)) {
-               return false;
+       boost::shared_ptr<Track> me = boost::dynamic_pointer_cast<Track> (shared_from_this ());
+       if (_diskstream->playlist()->all_regions_empty () && _session.playlists->playlists_for_track (me).size() == 1) {
+               /* Only rename the diskstream (and therefore the playlist) if
+                  a) the playlist has never had a region added to it and
+                  b) there is only one playlist for this track.
+
+                  If (a) is not followed, people can get confused if, say,
+                  they have notes about a playlist with a given name and then
+                  it changes (see mantis #4759).
+
+                  If (b) is not followed, we rename the current playlist and not
+                  the other ones, which is a bit confusing (see mantis #4977).
+               */
+               _diskstream->set_name (str);
        }
 
        /* save state so that the statefile fully reflects any filename changes */
 
-       if ((ret = IO::set_name (str)) == 0) {
+       if ((ret = Route::set_name (str)) == 0) {
                _session.save_state ("");
        }
 
@@ -221,9 +320,673 @@ Track::set_name (const string& str)
 }
 
 void
-Track::set_latency_delay (nframes_t longest_session_latency)
+Track::set_latency_compensation (framecnt_t longest_session_latency)
 {
-       Route::set_latency_delay (longest_session_latency);
+       Route::set_latency_compensation (longest_session_latency);
        _diskstream->set_roll_delay (_roll_delay);
 }
 
+int
+Track::no_roll (pframes_t nframes, framepos_t start_frame, framepos_t end_frame, bool session_state_changing)
+{
+       Glib::Threads::RWLock::ReaderLock lm (_processor_lock, Glib::Threads::TRY_LOCK);
+
+       if (!lm.locked()) {
+               return 0;
+       }
+
+       bool can_record = _session.actively_recording ();
+
+       /* no outputs? nothing to do ... what happens if we have sends etc. ? */
+
+       if (n_outputs().n_total() == 0) {
+               return 0;
+       }
+
+       /* not active ... do the minimum possible by just outputting silence */
+
+       if (!_active) {
+               silence (nframes);
+               if (_meter_point == MeterInput && (_monitoring & MonitorInput || _diskstream->record_enabled())) {
+                       _meter->reset();
+               }
+               return 0;
+       }
+
+       if (session_state_changing) {
+               if (_session.transport_speed() != 0.0f) {
+                       /* we're rolling but some state is changing (e.g. our diskstream contents)
+                          so we cannot use them. Be silent till this is over. Don't declick.
+
+                          XXX note the absurdity of ::no_roll() being called when we ARE rolling!
+                       */
+                       passthru_silence (start_frame, end_frame, nframes, 0);
+                       return 0;
+               }
+               /* we're really not rolling, so we're either delivery silence or actually
+                  monitoring, both of which are safe to do while session_state_changing is true.
+               */
+       }
+
+       _diskstream->check_record_status (start_frame, can_record);
+
+       bool be_silent;
+
+       if (_have_internal_generator) {
+               /* since the instrument has no input streams,
+                  there is no reason to send any signal
+                  into the route.
+               */
+               be_silent = true;
+
+       } else {
+
+               MonitorState const s = monitoring_state ();
+               /* we are not rolling, so be silent even if we are monitoring disk, as there
+                  will be no disk data coming in.
+               */
+               switch (s) {
+               case MonitoringSilence:
+                       /* if there is an instrument, be_silent should always
+                          be false
+                       */
+                       be_silent = (the_instrument_unlocked() == 0);
+                       break;
+               case MonitoringDisk:
+                       be_silent = true;
+                       break;
+               case MonitoringInput:
+                       be_silent = false;
+                       break;
+               }
+       }
+
+       _amp->apply_gain_automation (false);
+
+       /* if have_internal_generator, or .. */
+
+       if (be_silent) {
+
+               if (_meter_point == MeterInput) {
+                       /* still need input monitoring and metering */
+
+                       bool const track_rec = _diskstream->record_enabled ();
+                       bool const auto_input = _session.config.get_auto_input ();
+                       bool const software_monitor = Config->get_monitoring_model() == SoftwareMonitoring;
+                       bool const tape_machine_mode = Config->get_tape_machine_mode ();
+                       bool no_meter = false;
+
+                       /* this needs a proper K-map
+                        * and should be separated into a function similar to monitoring_state()
+                        * that also handles roll() states in audio_track.cc, midi_track.cc and route.cc
+                        *
+                        * see http://www.oofus.co.uk/ardour/Ardour3MonitorModesV3.pdf
+                        */
+                       if (!auto_input && !track_rec) {
+                               no_meter=true;
+                       }
+                       else if (tape_machine_mode && !track_rec && auto_input) {
+                               no_meter=true;
+                       }
+                       else if (!software_monitor && tape_machine_mode && !track_rec) {
+                               no_meter=true;
+                       }
+                       else if (!software_monitor && !tape_machine_mode && !track_rec && !auto_input) {
+                               no_meter=true;
+                       }
+
+                       if (no_meter) {
+                               _meter->reset();
+                               _input->process_input (boost::shared_ptr<Processor>(), start_frame, end_frame, nframes);
+                       } else {
+                               _input->process_input (_meter, start_frame, end_frame, nframes);
+                       }
+               }
+
+               passthru_silence (start_frame, end_frame, nframes, 0);
+
+       } else {
+
+               BufferSet& bufs = _session.get_scratch_buffers (n_process_buffers());
+               
+               fill_buffers_with_input (bufs, _input, nframes);
+
+               if (_meter_point == MeterInput) {
+                       _meter->run (bufs, start_frame, end_frame, nframes, true);
+               }
+
+               passthru (bufs, start_frame, end_frame, nframes, false);
+       }
+
+       for (ProcessorList::iterator i = _processors.begin(); i != _processors.end(); ++i) {
+               boost::shared_ptr<Delivery> d = boost::dynamic_pointer_cast<Delivery> (*i);
+               if (d) {
+                       d->flush_buffers (nframes);
+               }
+       }
+
+       return 0;
+}
+
+int
+Track::silent_roll (pframes_t nframes, framepos_t /*start_frame*/, framepos_t /*end_frame*/, bool& need_butler)
+{
+       Glib::Threads::RWLock::ReaderLock lm (_processor_lock, Glib::Threads::TRY_LOCK);
+       if (!lm.locked()) {
+               return 0;
+       }
+
+       if (n_outputs().n_total() == 0 && _processors.empty()) {
+               return 0;
+       }
+
+       if (!_active) {
+               silence (nframes);
+               return 0;
+       }
+
+       _silent = true;
+       _amp->apply_gain_automation(false);
+
+       silence (nframes);
+
+       framecnt_t playback_distance;
+
+       BufferSet& bufs (_session.get_silent_buffers (n_process_buffers()));
+
+       int const dret = _diskstream->process (bufs, _session.transport_frame(), nframes, playback_distance, false);
+       need_butler = _diskstream->commit (playback_distance);
+       return dret;
+}
+
+void
+Track::set_diskstream (boost::shared_ptr<Diskstream> ds)
+{
+       _diskstream = ds;
+
+       ds->PlaylistChanged.connect_same_thread (*this, boost::bind (&Track::diskstream_playlist_changed, this));
+       diskstream_playlist_changed ();
+       ds->RecordEnableChanged.connect_same_thread (*this, boost::bind (&Track::diskstream_record_enable_changed, this));
+       ds->SpeedChanged.connect_same_thread (*this, boost::bind (&Track::diskstream_speed_changed, this));
+       ds->AlignmentStyleChanged.connect_same_thread (*this, boost::bind (&Track::diskstream_alignment_style_changed, this));
+}
+
+void
+Track::diskstream_playlist_changed ()
+{
+       PlaylistChanged (); /* EMIT SIGNAL */
+}
+
+void
+Track::diskstream_record_enable_changed ()
+{
+       RecordEnableChanged (); /* EMIT SIGNAL */
+}
+
+void
+Track::diskstream_speed_changed ()
+{
+       SpeedChanged (); /* EMIT SIGNAL */
+}
+
+void
+Track::diskstream_alignment_style_changed ()
+{
+       AlignmentStyleChanged (); /* EMIT SIGNAL */
+}
+
+boost::shared_ptr<Playlist>
+Track::playlist ()
+{
+       return _diskstream->playlist ();
+}
+
+void
+Track::request_jack_monitors_input (bool m)
+{
+       _diskstream->request_jack_monitors_input (m);
+}
+
+void
+Track::ensure_jack_monitors_input (bool m)
+{
+       _diskstream->ensure_jack_monitors_input (m);
+}
+
+bool
+Track::destructive () const
+{
+       return _diskstream->destructive ();
+}
+
+list<boost::shared_ptr<Source> > &
+Track::last_capture_sources ()
+{
+       return _diskstream->last_capture_sources ();
+}
+
+void
+Track::set_capture_offset ()
+{
+       _diskstream->set_capture_offset ();
+}
+
+list<boost::shared_ptr<Source> >
+Track::steal_write_sources()
+{
+        return _diskstream->steal_write_sources ();
+}
+
+void
+Track::reset_write_sources (bool r, bool force)
+{
+       _diskstream->reset_write_sources (r, force);
+}
+
+float
+Track::playback_buffer_load () const
+{
+       return _diskstream->playback_buffer_load ();
+}
+
+float
+Track::capture_buffer_load () const
+{
+       return _diskstream->capture_buffer_load ();
+}
+
+int
+Track::do_refill ()
+{
+       return _diskstream->do_refill ();
+}
+
+int
+Track::do_flush (RunContext c, bool force)
+{
+       return _diskstream->do_flush (c, force);
+}
+
+void
+Track::set_pending_overwrite (bool o)
+{
+       _diskstream->set_pending_overwrite (o);
+}
+
+int
+Track::seek (framepos_t p, bool complete_refill)
+{
+       return _diskstream->seek (p, complete_refill);
+}
+
+bool
+Track::hidden () const
+{
+       return _diskstream->hidden ();
+}
+
+int
+Track::can_internal_playback_seek (framecnt_t p)
+{
+       return _diskstream->can_internal_playback_seek (p);
+}
+
+int
+Track::internal_playback_seek (framecnt_t p)
+{
+       return _diskstream->internal_playback_seek (p);
+}
+
+void
+Track::non_realtime_input_change ()
+{
+       _diskstream->non_realtime_input_change ();
+}
+
+void
+Track::non_realtime_locate (framepos_t p)
+{
+       Route::non_realtime_locate (p);
+
+       if (!hidden()) {
+               /* don't waste i/o cycles and butler calls
+                  for hidden (secret) tracks
+               */
+               _diskstream->non_realtime_locate (p);
+       }
+}
+
+void
+Track::non_realtime_set_speed ()
+{
+       _diskstream->non_realtime_set_speed ();
+}
+
+int
+Track::overwrite_existing_buffers ()
+{
+       return _diskstream->overwrite_existing_buffers ();
+}
+
+framecnt_t
+Track::get_captured_frames (uint32_t n) const
+{
+       return _diskstream->get_captured_frames (n);
+}
+
+int
+Track::set_loop (Location* l)
+{
+       return _diskstream->set_loop (l);
+}
+
+void
+Track::transport_looped (framepos_t p)
+{
+       _diskstream->transport_looped (p);
+}
+
+bool
+Track::realtime_set_speed (double s, bool g)
+{
+       return _diskstream->realtime_set_speed (s, g);
+}
+
+void
+Track::transport_stopped_wallclock (struct tm & n, time_t t, bool g)
+{
+       _diskstream->transport_stopped_wallclock (n, t, g);
+}
+
+bool
+Track::pending_overwrite () const
+{
+       return _diskstream->pending_overwrite ();
+}
+
+double
+Track::speed () const
+{
+       return _diskstream->speed ();
+}
+
+void
+Track::prepare_to_stop (framepos_t p)
+{
+       _diskstream->prepare_to_stop (p);
+}
+
+void
+Track::set_slaved (bool s)
+{
+       _diskstream->set_slaved (s);
+}
+
+ChanCount
+Track::n_channels ()
+{
+       return _diskstream->n_channels ();
+}
+
+framepos_t
+Track::get_capture_start_frame (uint32_t n) const
+{
+       return _diskstream->get_capture_start_frame (n);
+}
+
+AlignStyle
+Track::alignment_style () const
+{
+       return _diskstream->alignment_style ();
+}
+
+AlignChoice
+Track::alignment_choice () const
+{
+       return _diskstream->alignment_choice ();
+}
+
+framepos_t
+Track::current_capture_start () const
+{
+       return _diskstream->current_capture_start ();
+}
+
+framepos_t
+Track::current_capture_end () const
+{
+       return _diskstream->current_capture_end ();
+}
+
+void
+Track::playlist_modified ()
+{
+       _diskstream->playlist_modified ();
+}
+
+int
+Track::use_playlist (boost::shared_ptr<Playlist> p)
+{
+       int ret = _diskstream->use_playlist (p);
+       if (ret == 0) {
+               p->set_orig_track_id (id());
+       }
+       return ret;
+}
+
+int
+Track::use_copy_playlist ()
+{
+       int ret =  _diskstream->use_copy_playlist ();
+
+       if (ret == 0) {
+               _diskstream->playlist()->set_orig_track_id (id());
+       }
+
+       return ret;
+}
+
+int
+Track::use_new_playlist ()
+{
+       int ret = _diskstream->use_new_playlist ();
+
+       if (ret == 0) {
+               _diskstream->playlist()->set_orig_track_id (id());
+       }
+
+       return ret;
+}
+
+void
+Track::set_align_style (AlignStyle s, bool force)
+{
+       _diskstream->set_align_style (s, force);
+}
+
+void
+Track::set_align_choice (AlignChoice s, bool force)
+{
+       _diskstream->set_align_choice (s, force);
+}
+
+bool
+Track::using_diskstream_id (PBD::ID id) const
+{
+       return (id == _diskstream->id ());
+}
+
+void
+Track::set_block_size (pframes_t n)
+{
+       Route::set_block_size (n);
+       _diskstream->set_block_size (n);
+}
+
+void
+Track::adjust_playback_buffering ()
+{
+        if (_diskstream) {
+                _diskstream->adjust_playback_buffering ();
+        }
+}
+
+void
+Track::adjust_capture_buffering ()
+{
+        if (_diskstream) {
+                _diskstream->adjust_capture_buffering ();
+        }
+}
+
+MonitorState
+Track::monitoring_state () const
+{
+       /* Explicit requests */
+       
+       if (_monitoring & MonitorInput) {
+               return MonitoringInput;
+       }
+               
+       if (_monitoring & MonitorDisk) {
+               return MonitoringDisk;
+       }
+
+       /* This is an implementation of the truth table in doc/monitor_modes.pdf;
+          I don't think it's ever going to be too pretty too look at.
+       */
+
+       bool const roll = _session.transport_rolling ();
+       bool const track_rec = _diskstream->record_enabled ();
+       bool const auto_input = _session.config.get_auto_input ();
+       bool const software_monitor = Config->get_monitoring_model() == SoftwareMonitoring;
+       bool const tape_machine_mode = Config->get_tape_machine_mode ();
+       bool session_rec;
+
+       /* I suspect that just use actively_recording() is good enough all the
+        * time, but just to keep the semantics the same as they were before
+        * sept 26th 2012, we differentiate between the cases where punch is
+        * enabled and those where it is not.
+        */
+
+       if (_session.config.get_punch_in() || _session.config.get_punch_out()) {
+               session_rec = _session.actively_recording ();
+       } else {
+               session_rec = _session.get_record_enabled();
+       }
+
+       if (track_rec) {
+
+               if (!session_rec && roll && auto_input) {
+                       return MonitoringDisk;
+               } else {
+                       return software_monitor ? MonitoringInput : MonitoringSilence;
+               }
+
+       } else {
+
+               if (tape_machine_mode) {
+
+                       return MonitoringDisk;
+
+               } else {
+
+                       if (!roll && auto_input) {
+                               return software_monitor ? MonitoringInput : MonitoringSilence;
+                       } else {
+                               return MonitoringDisk;
+                       }
+                       
+               }
+       }
+
+       /* NOTREACHED */
+       return MonitoringSilence;
+}
+
+void
+Track::maybe_declick (BufferSet& bufs, framecnt_t nframes, int declick)
+{
+        /* never declick if there is an internal generator - we just want it to
+           keep generating sound without interruption.
+
+          ditto if we are monitoring inputs.
+        */
+
+        if (_have_internal_generator || monitoring_choice() == MonitorInput) {
+                return;
+        }
+
+        if (!declick) {
+               declick = _pending_declick;
+       }
+
+       if (declick != 0) {
+               Amp::declick (bufs, nframes, declick);
+       }
+}
+
+framecnt_t
+Track::check_initial_delay (framecnt_t nframes, framepos_t& transport_frame)
+{
+       if (_roll_delay > nframes) {
+
+               _roll_delay -= nframes;
+               silence_unlocked (nframes);
+               /* transport frame is not legal for caller to use */
+               return 0;
+
+       } else if (_roll_delay > 0) {
+
+               nframes -= _roll_delay;
+               silence_unlocked (_roll_delay);
+               transport_frame += _roll_delay;
+
+               /* shuffle all the port buffers for things that lead "out" of this Route
+                  to reflect that we just wrote _roll_delay frames of silence.
+               */
+
+               Glib::Threads::RWLock::ReaderLock lm (_processor_lock);
+               for (ProcessorList::iterator i = _processors.begin(); i != _processors.end(); ++i) {
+                       boost::shared_ptr<IOProcessor> iop = boost::dynamic_pointer_cast<IOProcessor> (*i);
+                       if (iop) {
+                               iop->increment_port_buffer_offset (_roll_delay);
+                       }
+               }
+               _output->increment_port_buffer_offset (_roll_delay);
+
+               _roll_delay = 0;
+
+       }
+
+       return nframes; 
+}
+
+void
+Track::set_monitoring (MonitorChoice mc)
+{
+       if (mc !=  _monitoring) {
+               _monitoring = mc;
+
+               for (ProcessorList::iterator i = _processors.begin(); i != _processors.end(); ++i) {
+                       (*i)->monitoring_changed ();
+               }
+
+               MonitoringChanged (); /* EMIT SIGNAL */
+       }
+}
+
+MeterState
+Track::metering_state () const
+{
+       bool rv;
+       if (_session.transport_rolling ()) {
+               // audio_track.cc || midi_track.cc roll() runs meter IFF:
+               rv = _meter_point == MeterInput && (_monitoring & MonitorInput || _diskstream->record_enabled());
+       } else {
+               // track no_roll() always metering if
+               rv = _meter_point == MeterInput;
+       }
+       return rv ? MeteringInput : MeteringRoute;
+}
+