X-Git-Url: https://main.carlh.net/gitweb/?a=blobdiff_plain;f=libs%2Fardour%2Fmidi_track.cc;h=f88c331c2ca8a0e7b171b7f1a4aea9a5f9ac7ba9;hb=d90e2b42211ead2a38afd5590e2937992312795e;hp=aa23e3d92bec3b1c83142a3e7db2ca697727fad0;hpb=19273e824d40534a4e31259fb8b83122b24aa4e9;p=ardour.git

diff --git a/libs/ardour/midi_track.cc b/libs/ardour/midi_track.cc
index aa23e3d92b..f88c331c2c 100644
--- a/libs/ardour/midi_track.cc
+++ b/libs/ardour/midi_track.cc
@@ -1,6 +1,6 @@
 /*
-    Copyright (C) 2006 Paul Davis 
-	By Dave Robillard, 2006
+    Copyright (C) 2006 Paul Davis
+    Author: David Robillard
 
     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
@@ -16,30 +16,36 @@
     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 <pbd/enumwriter.h>
-
-#include <ardour/midi_track.h>
-#include <ardour/midi_diskstream.h>
-#include <ardour/session.h>
-#include <ardour/io_processor.h>
-#include <ardour/midi_region.h>
-#include <ardour/midi_source.h>
-#include <ardour/route_group_specialized.h>
-#include <ardour/processor.h>
-#include <ardour/midi_playlist.h>
-#include <ardour/panner.h>
-#include <ardour/utils.h>
-#include <ardour/buffer_set.h>
-#include <ardour/meter.h>
-#include <ardour/midi_events.h>
+
+#include <strings.h> // for ffs(3)
+
+#include "pbd/enumwriter.h"
+#include "pbd/convert.h"
+#include "evoral/midi_util.h"
+
+#include "ardour/buffer_set.h"
+#include "ardour/debug.h"
+#include "ardour/delivery.h"
+#include "ardour/meter.h"
+#include "ardour/midi_diskstream.h"
+#include "ardour/midi_playlist.h"
+#include "ardour/midi_port.h"
+#include "ardour/midi_track.h"
+#include "ardour/port.h"
+#include "ardour/processor.h"
+#include "ardour/session.h"
+#include "ardour/session_playlists.h"
+#include "ardour/utils.h"
 
 #include "i18n.h"
 
+namespace ARDOUR {
+class InterThreadInfo;
+class MidiSource;
+class Region;
+class SMFSource;
+}
+
 using namespace std;
 using namespace ARDOUR;
 using namespace PBD;
@@ -47,96 +53,81 @@ using namespace PBD;
 MidiTrack::MidiTrack (Session& sess, string name, Route::Flag flag, TrackMode mode)
 	: Track (sess, name, flag, mode, DataType::MIDI)
 	, _immediate_events(1024) // FIXME: size?
+	, _step_edit_ring_buffer(64) // FIXME: size?
+	, _note_mode(Sustained)
+	, _step_editing (false)
+	, _input_active (true)
+	, _playback_channel_mask(0x0000ffff)
+	, _capture_channel_mask(0x0000ffff)
+{
+}
+
+MidiTrack::~MidiTrack ()
+{
+}
+
+int
+MidiTrack::init ()
+{
+	if (Track::init ()) {
+		return -1;
+	}
+
+	_input->changed.connect_same_thread (*this, boost::bind (&MidiTrack::track_input_active, this, _1, _2));
+
+	return 0;
+}
+
+boost::shared_ptr<Diskstream>
+MidiTrack::create_diskstream ()
 {
 	MidiDiskstream::Flag dflags = MidiDiskstream::Flag (0);
 
-	if (_flags & Hidden) {
+	if (_flags & Auditioner) {
 		dflags = MidiDiskstream::Flag (dflags | MidiDiskstream::Hidden);
 	} else {
 		dflags = MidiDiskstream::Flag (dflags | MidiDiskstream::Recordable);
 	}
 
-	assert(mode != Destructive);
+	assert(_mode != Destructive);
 
-	boost::shared_ptr<MidiDiskstream> ds (new MidiDiskstream (_session, name, dflags));
-	_session.add_diskstream (ds);
+	return boost::shared_ptr<Diskstream> (new MidiDiskstream (_session, name(), dflags));
+}
 
-	set_diskstream (boost::dynamic_pointer_cast<MidiDiskstream> (ds));
-	
-	_declickable = true;
-	_freeze_record.state = NoFreeze;
-	_saved_meter_point = _meter_point;
-	_mode = mode;
 
-	set_input_minimum(ChanCount(DataType::MIDI, 1));
-	set_input_maximum(ChanCount(DataType::MIDI, 1));
-	set_output_minimum(ChanCount(DataType::MIDI, 1));
-	set_output_maximum(ChanCount(DataType::MIDI, 1));
+void
+MidiTrack::set_record_enabled (bool yn, void *src)
+{
+	if (_step_editing) {
+		return;
+	}
 
-	MoreChannels(ChanCount(DataType::MIDI, 2)); /* EMIT SIGNAL */
+	Track::set_record_enabled (yn, src);
 }
 
-MidiTrack::MidiTrack (Session& sess, const XMLNode& node)
-	: Track (sess, node)
-	, _immediate_events(1024) // FIXME: size?
+void
+MidiTrack::set_diskstream (boost::shared_ptr<Diskstream> ds)
 {
-	_set_state(node, false);
-	
-	set_input_minimum(ChanCount(DataType::MIDI, 1));
-	set_input_maximum(ChanCount(DataType::MIDI, 1));
-	set_output_minimum(ChanCount(DataType::MIDI, 1));
-	set_output_maximum(ChanCount(DataType::MIDI, 1));
+	/* We have to do this here, as Track::set_diskstream will cause a buffer refill,
+	   and the diskstream must be set up to fill its buffers using the correct _note_mode.
+	*/
+	boost::shared_ptr<MidiDiskstream> mds = boost::dynamic_pointer_cast<MidiDiskstream> (ds);
+	mds->set_note_mode (_note_mode);
 	
-	MoreChannels(ChanCount(DataType::MIDI, 2)); /* EMIT SIGNAL */
-}
-
-MidiTrack::~MidiTrack ()
-{
-}
+	Track::set_diskstream (ds);
 
+	mds->reset_tracker ();	
 
-int
-MidiTrack::set_diskstream (boost::shared_ptr<MidiDiskstream> ds)
-{
-	_diskstream = ds;
-	_diskstream->set_io (*this);
+	_diskstream->set_track (this);
 	_diskstream->set_destructive (_mode == Destructive);
-
 	_diskstream->set_record_enabled (false);
-	//_diskstream->monitor_input (false);
 
-	ic_connection.disconnect();
-	ic_connection = input_changed.connect (mem_fun (*_diskstream, &MidiDiskstream::handle_input_change));
+	_diskstream_data_recorded_connection.disconnect ();
+	mds->DataRecorded.connect_same_thread (
+		_diskstream_data_recorded_connection,
+		boost::bind (&MidiTrack::diskstream_data_recorded, this, _1));
 
 	DiskstreamChanged (); /* EMIT SIGNAL */
-
-	return 0;
-}	
-
-int 
-MidiTrack::use_diskstream (string name)
-{
-	boost::shared_ptr<MidiDiskstream> dstream;
-
-	if ((dstream = boost::dynamic_pointer_cast<MidiDiskstream>(_session.diskstream_by_name (name))) == 0) {
-		error << string_compose(_("MidiTrack: midi diskstream \"%1\" not known by session"), name) << endmsg;
-		return -1;
-	}
-	
-	return set_diskstream (dstream);
-}
-
-int 
-MidiTrack::use_diskstream (const PBD::ID& id)
-{
-	boost::shared_ptr<MidiDiskstream> dstream;
-
-	if ((dstream = boost::dynamic_pointer_cast<MidiDiskstream> (_session.diskstream_by_id (id))) == 0) {
-	  	error << string_compose(_("MidiTrack: midi diskstream \"%1\" not known by session"), id) << endmsg;
-		return -1;
-	}
-	
-	return set_diskstream (dstream);
 }
 
 boost::shared_ptr<MidiDiskstream>
@@ -146,76 +137,79 @@ MidiTrack::midi_diskstream() const
 }
 
 int
-MidiTrack::set_state (const XMLNode& node)
-{
-	return _set_state (node, true);
-}
-
-int
-MidiTrack::_set_state (const XMLNode& node, bool call_base)
+MidiTrack::set_state (const XMLNode& node, int version)
 {
 	const XMLProperty *prop;
-	XMLNodeConstIterator iter;
 
-	if (Route::_set_state (node, call_base)) {
-		return -1;
-	}
-	
-	if ((prop = node.property (X_("mode"))) != 0) {
-		_mode = TrackMode (string_2_enum (prop->value(), _mode));
+	/* This must happen before Track::set_state(), as there will be a buffer
+	   fill during that call, and we must fill buffers using the correct
+	   _note_mode.
+	*/
+	if ((prop = node.property (X_("note-mode"))) != 0) {
+		_note_mode = NoteMode (string_2_enum (prop->value(), _note_mode));
 	} else {
-		_mode = Normal;
+		_note_mode = Sustained;
 	}
 
-	if ((prop = node.property ("diskstream-id")) == 0) {
-		
-		/* some old sessions use the diskstream name rather than the ID */
-
-		if ((prop = node.property ("diskstream")) == 0) {
-			fatal << _("programming error: MidiTrack given state without diskstream!") << endmsg;
-			/*NOTREACHED*/
-			return -1;
-		}
+	if (Track::set_state (node, version)) {
+		return -1;
+	}
 
-		if (use_diskstream (prop->value())) {
-			return -1;
-		}
+	// No destructive MIDI tracks (yet?)
+	_mode = Normal;
 
-	} else {
-		
-		PBD::ID id (prop->value());
-		
-		if (use_diskstream (id)) {
-			return -1;
-		}
+	if ((prop = node.property ("input-active")) != 0) {
+		set_input_active (string_is_affirmative (prop->value()));
 	}
 
+	ChannelMode playback_channel_mode = AllChannels;
+	ChannelMode capture_channel_mode = AllChannels;
 
-	XMLNodeList nlist;
-	XMLNodeConstIterator niter;
-	XMLNode *child;
+	if ((prop = node.property ("playback-channel-mode")) != 0) {
+		playback_channel_mode = ChannelMode (string_2_enum(prop->value(), playback_channel_mode));
+	}
+	if ((prop = node.property ("capture-channel-mode")) != 0) {
+		capture_channel_mode = ChannelMode (string_2_enum(prop->value(), capture_channel_mode));
+	}
+	if ((prop = node.property ("channel-mode")) != 0) {
+		/* 3.0 behaviour where capture and playback modes were not separated */
+		playback_channel_mode = ChannelMode (string_2_enum(prop->value(), playback_channel_mode));
+		capture_channel_mode = playback_channel_mode;
+	}
 
-	nlist = node.children();
-	for (niter = nlist.begin(); niter != nlist.end(); ++niter){
-		child = *niter;
+	unsigned int playback_channel_mask = 0xffff;
+	unsigned int capture_channel_mask = 0xffff;
 
-		if (child->name() == X_("recenable")) {
-			_rec_enable_control->set_state (*child);
-			_session.add_controllable (_rec_enable_control);
-		}
+	if ((prop = node.property ("playback-channel-mask")) != 0) {
+		sscanf (prop->value().c_str(), "0x%x", &playback_channel_mask);
 	}
+	if ((prop = node.property ("capture-channel-mask")) != 0) {
+		sscanf (prop->value().c_str(), "0x%x", &capture_channel_mask);
+	}
+	if ((prop = node.property ("channel-mask")) != 0) {
+		sscanf (prop->value().c_str(), "0x%x", &playback_channel_mask);
+		capture_channel_mask = playback_channel_mask;
+	}
+
+	set_playback_channel_mode (playback_channel_mode, playback_channel_mask);
+	set_capture_channel_mode (capture_channel_mode, capture_channel_mask);
 
 	pending_state = const_cast<XMLNode*> (&node);
 
-	_session.StateReady.connect (mem_fun (*this, &MidiTrack::set_state_part_two));
+	if (_session.state_of_the_state() & Session::Loading) {
+		_session.StateReady.connect_same_thread (
+			*this, boost::bind (&MidiTrack::set_state_part_two, this));
+	} else {
+		set_state_part_two ();
+	}
 
 	return 0;
 }
 
-XMLNode& 
+XMLNode&
 MidiTrack::state(bool full_state)
 {
-	XMLNode& root (Route::state(full_state));
+	XMLNode& root (Track::state(full_state));
 	XMLNode* freeze_node;
 	char buf[64];
 
@@ -231,32 +225,23 @@ MidiTrack::state(bool full_state)
 			(*i)->id.print (buf, sizeof(buf));
 			inode->add_property (X_("id"), buf);
 			inode->add_child_copy ((*i)->state);
-		
+
 			freeze_node->add_child_nocopy (*inode);
 		}
 
 		root.add_child_nocopy (*freeze_node);
 	}
 
-	/* Alignment: act as a proxy for the diskstream */
-	
-	XMLNode* align_node = new XMLNode (X_("alignment"));
-	AlignStyle as = _diskstream->alignment_style ();
-	align_node->add_property (X_("style"), enum_2_string (as));
-	root.add_child_nocopy (*align_node);
+	root.add_property("playback_channel-mode", enum_2_string(get_playback_channel_mode()));
+	root.add_property("capture_channel-mode", enum_2_string(get_capture_channel_mode()));
+	snprintf (buf, sizeof(buf), "0x%x", get_playback_channel_mask());
+	root.add_property("playback-channel-mask", buf);
+	snprintf (buf, sizeof(buf), "0x%x", get_capture_channel_mask());
+	root.add_property("capture-channel-mask", buf);
 
-	root.add_property (X_("mode"), enum_2_string (_mode));
-	
-	/* we don't return diskstream state because we don't
-	   own the diskstream exclusively. control of the diskstream
-	   state is ceded to the Session, even if we create the
-	   diskstream.
-	*/
-
-	_diskstream->id().print (buf, sizeof(buf));
-	root.add_property ("diskstream-id", buf);
-	
-	root.add_child_nocopy (_rec_enable_control->get_state());
+	root.add_property ("note-mode", enum_2_string (_note_mode));
+	root.add_property ("step-editing", (_step_editing ? "yes" : "no"));
+	root.add_property ("input-active", (_input_active ? "yes" : "no"));
 
 	return root;
 }
@@ -278,17 +263,15 @@ MidiTrack::set_state_part_two ()
 
 	if ((fnode = find_named_node (*pending_state, X_("freeze-info"))) != 0) {
 
-		
-		_freeze_record.have_mementos = false;
 		_freeze_record.state = Frozen;
-		
+
 		for (vector<FreezeRecordProcessorInfo*>::iterator i = _freeze_record.processor_info.begin(); i != _freeze_record.processor_info.end(); ++i) {
 			delete *i;
 		}
 		_freeze_record.processor_info.clear ();
-		
+
 		if ((prop = fnode->property (X_("playlist"))) != 0) {
-			boost::shared_ptr<Playlist> pl = _session.playlist_by_name (prop->value());
+			boost::shared_ptr<Playlist> pl = _session.playlists->by_name (prop->value());
 			if (pl) {
 				_freeze_record.playlist = boost::dynamic_pointer_cast<MidiPlaylist> (pl);
 			} else {
@@ -297,23 +280,23 @@ MidiTrack::set_state_part_two ()
 			return;
 			}
 		}
-		
+
 		if ((prop = fnode->property (X_("state"))) != 0) {
 			_freeze_record.state = FreezeState (string_2_enum (prop->value(), _freeze_record.state));
 		}
-		
+
 		XMLNodeConstIterator citer;
 		XMLNodeList clist = fnode->children();
-		
+
 		for (citer = clist.begin(); citer != clist.end(); ++citer) {
 			if ((*citer)->name() != X_("processor")) {
 				continue;
 			}
-			
+
 			if ((prop = (*citer)->property (X_("id"))) == 0) {
 				continue;
 			}
-			
+
 			FreezeRecordProcessorInfo* frii = new FreezeRecordProcessorInfo (*((*citer)->children().front()),
 										   boost::shared_ptr<Processor>());
 			frii->id = prop->value ();
@@ -321,408 +304,594 @@ MidiTrack::set_state_part_two ()
 		}
 	}
 
-	/* Alignment: act as a proxy for the diskstream */
-
-	if ((fnode = find_named_node (*pending_state, X_("alignment"))) != 0) {
+	if (midi_diskstream ()) {
+		midi_diskstream()->set_block_size (_session.get_block_size ());
+	}
 
-		if ((prop = fnode->property (X_("style"))) != 0) {
+	return;
+}
 
-			/* fix for older sessions from before EnumWriter */
+/** @param need_butler to be set to true if this track now needs the butler, otherwise it can be left alone
+ *  or set to false.
+ */
+int
+MidiTrack::roll (pframes_t nframes, framepos_t start_frame, framepos_t end_frame, int declick, bool& need_butler)
+{
+	Glib::Threads::RWLock::ReaderLock lm (_processor_lock, Glib::Threads::TRY_LOCK);
+	if (!lm.locked()) {
+		boost::shared_ptr<MidiDiskstream> diskstream = midi_diskstream();
+		framecnt_t playback_distance = diskstream->calculate_playback_distance(nframes);
+		if (can_internal_playback_seek(llabs(playback_distance))) {
+			/* TODO should declick, and/or note-off */
+			internal_playback_seek(playback_distance);
+		}
+		return 0;
+	}
 
-			string pstr;
+	boost::shared_ptr<MidiDiskstream> diskstream = midi_diskstream();
 
-			if (prop->value() == "capture") {
-				pstr = "CaptureTime";
-			} else if (prop->value() == "existing") {
-				pstr = "ExistingMaterial";
-			} else {
-				pstr = prop->value();
-			}
+	if (n_outputs().n_total() == 0 && _processors.empty()) {
+		return 0;
+	}
 
-			AlignStyle as = AlignStyle (string_2_enum (pstr, as));
-			_diskstream->set_persistent_align_style (as);
+	if (!_active) {
+		silence (nframes);
+		if (_meter_point == MeterInput && (_monitoring & MonitorInput || _diskstream->record_enabled())) {
+			_meter->reset();
 		}
+		return 0;
 	}
-	return;
-}	
 
-int 
-MidiTrack::no_roll (nframes_t nframes, nframes_t start_frame, nframes_t end_frame, nframes_t offset, 
-		     bool session_state_changing, bool can_record, bool rec_monitors_input)
-{
-	if (n_outputs().n_midi() == 0) {
-		//return 0;
-		throw; // FIXME
-	}
+	framepos_t transport_frame = _session.transport_frame();
 
-	if (!_active) {
-		silence (nframes, offset);
-		//return 0; // FIXME
+	int dret;
+	framecnt_t playback_distance;
+
+	if ((nframes = check_initial_delay (nframes, transport_frame)) == 0) {
+		/* need to do this so that the diskstream sets its
+		   playback distance to zero, thus causing diskstream::commit
+		   to do nothing.
+		   */
+		BufferSet bufs; /* empty set - is OK, since nothing will happen */
+
+		dret = diskstream->process (bufs, transport_frame, 0, playback_distance, false);
+		need_butler = diskstream->commit (playback_distance);
+		return dret;
 	}
 
-	if (session_state_changing) {
+	BufferSet& bufs = _session.get_route_buffers (n_process_buffers());
 
-		/* XXX is this safe to do against transport state changes? */
+	fill_buffers_with_input (bufs, _input, nframes);
 
-		passthru_silence (start_frame, end_frame, nframes, offset, 0, false);
-		return 0;
+	if (_meter_point == MeterInput && (_monitoring & MonitorInput || _diskstream->record_enabled())) {
+		_meter->run (bufs, start_frame, end_frame, nframes, true);
 	}
 
-	midi_diskstream()->check_record_status (start_frame, nframes, can_record);
+	/* filter captured data before the diskstream sees it */
 
-	bool send_silence;
-	
-	if (_have_internal_generator) {
-		/* since the instrument has no input streams,
-		   there is no reason to send any signal
-		   into the route.
-		*/
-		send_silence = true;
-	} else {
+	filter_channels (bufs, get_capture_channel_mode(), get_capture_channel_mask());
 
-		if (Config->get_auto_input()) {
-			if (Config->get_monitoring_model() == SoftwareMonitoring) {
-				send_silence = false;
-			} else {
-				send_silence = true;
-			}
-		} else {
-			if (_diskstream->record_enabled()) {
-				if (Config->get_monitoring_model() == SoftwareMonitoring) {
-					send_silence = false;
-				} else {
-					send_silence = true;
-				}
-			} else {
-				send_silence = true;
-			}
-		}
+	_silent = false;
+
+	if ((dret = diskstream->process (bufs, transport_frame, nframes, playback_distance, (monitoring_state() == MonitoringDisk))) != 0) {
+		need_butler = diskstream->commit (playback_distance);
+		silence (nframes);
+		return dret;
 	}
 
-	apply_gain_automation = false;
+	/* filter playback data before we do anything else */
+	
+	filter_channels (bufs, get_playback_channel_mode(), get_playback_channel_mask ());
 
-	if (send_silence) {
-		
-		/* if we're sending silence, but we want the meters to show levels for the signal,
-		   meter right here.
+	if (monitoring_state() == MonitoringInput) {
+
+		/* not actually recording, but we want to hear the input material anyway,
+		   at least potentially (depending on monitoring options)
 		*/
-		
-		if (_have_internal_generator) {
-			passthru_silence (start_frame, end_frame, nframes, offset, 0, true);
-		} else {
-			if (_meter_point == MeterInput) {
-				just_meter_input (start_frame, end_frame, nframes, offset);
-			}
-			passthru_silence (start_frame, end_frame, nframes, offset, 0, false);
-		}
 
-	} else {
-	
-		/* we're sending signal, but we may still want to meter the input. 
+		/* because the playback buffer is event based and not a
+		 * continuous stream, we need to make sure that we empty
+		 * it of events every cycle to avoid it filling up with events
+		 * read from disk, while we are actually monitoring input
 		 */
 
-		passthru (start_frame, end_frame, nframes, offset, 0, (_meter_point == MeterInput));
+		diskstream->flush_playback (start_frame, end_frame);
+
+	} 
+
+	
+	/* append immediate messages to the first MIDI buffer (thus sending it to the first output port) */
+	
+	write_out_of_band_data (bufs, start_frame, end_frame, nframes);
+	
+	/* final argument: don't waste time with automation if we're not recording or rolling */
+	
+	process_output_buffers (bufs, start_frame, end_frame, nframes,
+				declick, (!diskstream->record_enabled() && !_session.transport_stopped()));
+
+	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);
+		}
 	}
 
+	need_butler = diskstream->commit (playback_distance);
+	
 	return 0;
 }
 
 int
-MidiTrack::roll (nframes_t nframes, nframes_t start_frame, nframes_t end_frame, nframes_t offset, int declick,
-		  bool can_record, bool rec_monitors_input)
+MidiTrack::no_roll (pframes_t nframes, framepos_t start_frame, framepos_t end_frame, bool state_changing)
 {
-	int dret;
-	boost::shared_ptr<MidiDiskstream> diskstream = midi_diskstream();
-	
-	{
-		Glib::RWLock::ReaderLock lm (_processor_lock, Glib::TRY_LOCK);
-		if (lm.locked()) {
-			// automation snapshot can also be called from the non-rt context
-			// and it uses the redirect list, so we take the lock out here
-			automation_snapshot (start_frame);
-		}
-	}
+	int ret = Track::no_roll (nframes, start_frame, end_frame, state_changing);
 
-	if (n_outputs().n_total() == 0 && _processors.empty()) {
-		return 0;
+	if (ret == 0 && _step_editing) {
+		push_midi_input_to_step_edit_ringbuffer (nframes);
 	}
 
-	if (!_active) {
-		silence (nframes, offset);
-		return 0;
-	}
+	return ret;
+}
 
-	nframes_t transport_frame = _session.transport_frame();
+void
+MidiTrack::realtime_locate ()
+{
+	Glib::Threads::RWLock::ReaderLock lm (_processor_lock, Glib::Threads::TRY_LOCK);
 
-	if ((nframes = check_initial_delay (nframes, offset, transport_frame)) == 0) {
-		/* need to do this so that the diskstream sets its
-		   playback distance to zero, thus causing diskstream::commit
-		   to do nothing.
-		   */
-		return diskstream->process (transport_frame, 0, 0, can_record, rec_monitors_input);
-	} 
+	if (!lm.locked ()) {
+		return;
+	}
 
-	_silent = false;
+	for (ProcessorList::iterator i = _processors.begin(); i != _processors.end(); ++i) {
+		(*i)->realtime_locate ();
+	}
 
-	if ((dret = diskstream->process (transport_frame, nframes, offset, can_record, rec_monitors_input)) != 0) {
+	midi_diskstream()->reset_tracker ();
+}
 
-		silence (nframes, offset);
+void
+MidiTrack::realtime_handle_transport_stopped ()
+{
+	Glib::Threads::RWLock::ReaderLock lm (_processor_lock, Glib::Threads::TRY_LOCK);
 
-		return dret;
+	if (!lm.locked ()) {
+		return;
 	}
 
-	/* special condition applies */
-
-	if (_meter_point == MeterInput) {
-		just_meter_input (start_frame, end_frame, nframes, offset);
+	for (ProcessorList::iterator i = _processors.begin(); i != _processors.end(); ++i) {
+		(*i)->realtime_handle_transport_stopped ();
 	}
+}
 
-	if (diskstream->record_enabled() && !can_record && !Config->get_auto_input()) {
+void
+MidiTrack::push_midi_input_to_step_edit_ringbuffer (framecnt_t nframes)
+{
+	PortSet& ports (_input->ports());
 
-		/* not actually recording, but we want to hear the input material anyway,
-		   at least potentially (depending on monitoring options)
-		   */
+	for (PortSet::iterator p = ports.begin(DataType::MIDI); p != ports.end(DataType::MIDI); ++p) {
 
-		passthru (start_frame, end_frame, nframes, offset, 0, true);
+		Buffer& b (p->get_buffer (nframes));
+		const MidiBuffer* const mb = dynamic_cast<MidiBuffer*>(&b);
+		assert (mb);
 
-	} else {
-		/*
-		   XXX is it true that the earlier test on n_outputs()
-		   means that we can avoid checking it again here? i think
-		   so, because changing the i/o configuration of an IO
-		   requires holding the AudioEngine lock, which we hold
-		   while in the process() tree.
-		   */
+		for (MidiBuffer::const_iterator e = mb->begin(); e != mb->end(); ++e) {
 
+			const Evoral::MIDIEvent<framepos_t> ev(*e, false);
 
-		/* copy the diskstream data to all output buffers */
+			/* note on, since for step edit, note length is determined
+			   elsewhere
+			*/
 
-		//const size_t limit = n_process_buffers().n_audio();
-		BufferSet& bufs = _session.get_scratch_buffers (n_process_buffers());
+			if (ev.is_note_on()) {
+				/* we don't care about the time for this purpose */
+				_step_edit_ring_buffer.write (0, ev.type(), ev.size(), ev.buffer());
+			}
+		}
+	}
+}
 
-		diskstream->get_playback(bufs.get_midi(0), start_frame, end_frame);
+void 
+MidiTrack::filter_channels (BufferSet& bufs, ChannelMode mode, uint32_t mask)
+{
+	if (mode == AllChannels) {
+		return;
+	}
 
-		process_output_buffers (bufs, start_frame, end_frame, nframes, offset,
-				(!_session.get_record_enabled() || !Config->get_do_not_record_plugins()), declick, (_meter_point != MeterInput));
+	MidiBuffer& buf (bufs.get_midi (0));
 	
-	}
+	for (MidiBuffer::iterator e = buf.begin(); e != buf.end(); ) {
+		
+		Evoral::MIDIEvent<framepos_t> ev(*e, false);
 
-	return 0;
+		if (ev.is_channel_event()) {
+			switch (mode) {
+			case FilterChannels:
+				if (0 == ((1<<ev.channel()) & mask)) {
+					e = buf.erase (e);
+				} else {
+					++e;
+				}
+				break;
+			case ForceChannel:
+				ev.set_channel (ffs (mask) - 1);
+				++e;
+				break;
+			case AllChannels:
+				/* handled by the opening if() */
+				++e;
+				break;
+			}
+		} else {
+			++e;
+		}
+	}
 }
 
-int
-MidiTrack::silent_roll (nframes_t nframes, nframes_t start_frame, nframes_t end_frame, nframes_t offset, 
-			 bool can_record, bool rec_monitors_input)
+void
+MidiTrack::write_out_of_band_data (BufferSet& bufs, framepos_t /*start*/, framepos_t /*end*/, framecnt_t nframes)
 {
-	if (n_outputs().n_midi() == 0 && _processors.empty()) {
-		return 0;
-	}
+	MidiBuffer& buf (bufs.get_midi (0));
 
-	if (!_active) {
-		silence (nframes, offset);
-		return 0;
-	}
+	// Append immediate events
 
-	_silent = true;
-	apply_gain_automation = false;
+	if (_immediate_events.read_space()) {
 
-	silence (nframes, offset);
+		DEBUG_TRACE (DEBUG::MidiIO, string_compose ("%1 has %2 of immediate events to deliver\n",
+		                                            name(), _immediate_events.read_space()));
 
-	return midi_diskstream()->process (_session.transport_frame() + offset, nframes, offset, can_record, rec_monitors_input);
-}
+		/* write as many of the immediate events as we can, but give "true" as
+		 * the last argument ("stop on overflow in destination") so that we'll
+		 * ship the rest out next time.
+		 *
+		 * the (nframes-1) argument puts all these events at the last
+		 * possible position of the output buffer, so that we do not
+		 * violate monotonicity when writing.
+		 */
 
-void
-MidiTrack::process_output_buffers (BufferSet& bufs,
-			       nframes_t start_frame, nframes_t end_frame, 
-			       nframes_t nframes, nframes_t offset, bool with_processors, int declick,
-			       bool meter)
-{
-	/* There's no such thing as a MIDI bus for the time being.
-	 * We'll do all the MIDI route work here for now, but the long-term goal is to have
-	 * Route::process_output_buffers handle everything */
-	
-	if (meter && (_meter_point == MeterInput || _meter_point == MeterPreFader)) {
-		_meter->run(bufs, start_frame, end_frame, nframes, offset);
+		_immediate_events.read (buf, 0, 1, nframes-1, true);
 	}
+}
 
-	// Run all processors
-	if (with_processors) {
-		Glib::RWLock::ReaderLock rm (_processor_lock, Glib::TRY_LOCK);
-		if (rm.locked()) {
-			for (ProcessorList::iterator i = _processors.begin(); i != _processors.end(); ++i) {
-				(*i)->run_in_place (bufs, start_frame, end_frame, nframes, offset);
-			}
-		} 
-	}
-	
-	if (meter && (_meter_point == MeterPostFader)) {
-		_meter->run(bufs, start_frame, end_frame, nframes, offset);
-	}
-	
-	// Main output stage
-	if (muted()) {
-		IO::silence(nframes, offset);
-	} else {
+int
+MidiTrack::export_stuff (BufferSet& /*bufs*/, framepos_t /*start_frame*/, framecnt_t /*nframes*/, 
+			 boost::shared_ptr<Processor> /*endpoint*/, bool /*include_endpoint*/, bool /*forexport*/)
+{
+	return -1;
+}
 
-		MidiBuffer& output_buf = bufs.get_midi(0);
-		write_controller_messages(output_buf, start_frame, end_frame, nframes, offset);
+boost::shared_ptr<Region>
+MidiTrack::bounce (InterThreadInfo& /*itt*/)
+{
+	std::cerr << "MIDI bounce currently unsupported" << std::endl;
+	return boost::shared_ptr<Region> ();
+}
 
-		deliver_output(bufs, start_frame, end_frame, nframes, offset);
-	}
+
+boost::shared_ptr<Region>
+MidiTrack::bounce_range (framepos_t /*start*/, framepos_t /*end*/, InterThreadInfo& /*itt*/,
+			 boost::shared_ptr<Processor> /*endpoint*/, bool /*include_endpoint*/)
+{
+	std::cerr << "MIDI bounce range currently unsupported" << std::endl;
+	return boost::shared_ptr<Region> ();
 }
 
 void
-MidiTrack::write_controller_messages(MidiBuffer& output_buf, nframes_t start_frame, nframes_t end_frame, 
-			       nframes_t nframes, nframes_t offset)
+MidiTrack::freeze_me (InterThreadInfo& /*itt*/)
 {
-	BufferSet& mix_buffers = _session.get_mix_buffers(ChanCount(DataType::MIDI, 2));
-
-	/* FIXME: this could be more realtimey */
-
-	// Write immediate events (UI controls)
-	MidiBuffer& cc_buf = mix_buffers.get_midi(0);
-	cc_buf.silence(nframes, offset);
-	MidiEvent ev;
-	ev.size = 3; // CC = 3 bytes
-	Byte buf[ev.size];
-	buf[0] = MIDI_CMD_CONTROL;
-	ev.buffer = buf;
+	std::cerr << "MIDI freeze currently unsupported" << std::endl;
+}
 
-	// Write controller automation
-	if (_session.transport_rolling()) {
-		for (Controls::const_iterator i = _controls.begin(); i != _controls.end(); ++i) {
-			const boost::shared_ptr<AutomationList> list = (*i).second->list();
+void
+MidiTrack::unfreeze ()
+{
+	_freeze_record.state = UnFrozen;
+	FreezeChange (); /* EMIT SIGNAL */
+}
 
-			if ( (!list->automation_playback())
-					|| (list->parameter().type() != MidiCCAutomation))
-				continue;
+void
+MidiTrack::set_note_mode (NoteMode m)
+{
+	_note_mode = m;
+	midi_diskstream()->set_note_mode(m);
+}
 
-			double start = start_frame;
-			double x, y;
-			while ((*i).second->list()->rt_safe_earliest_event(start, end_frame, x, y)) {
-				assert(x >= start_frame);
-				assert(x <= end_frame);
+std::string
+MidiTrack::describe_parameter (Evoral::Parameter param)
+{
+	const std::string str(instrument_info().get_controller_name(param));
+	return str.empty() ? Automatable::describe_parameter(param) : str;
+}
 
-				const nframes_t stamp = (nframes_t)floor(x - start_frame);
-				assert(stamp < nframes);
+void
+MidiTrack::midi_panic()
+{
+	DEBUG_TRACE (DEBUG::MidiIO, string_compose ("%1 delivers panic data\n", name()));
+	for (uint8_t channel = 0; channel <= 0xF; channel++) {
+		uint8_t ev[3] = { ((uint8_t) (MIDI_CMD_CONTROL | channel)), ((uint8_t) MIDI_CTL_SUSTAIN), 0 };
+		write_immediate_event(3, ev);
+		ev[1] = MIDI_CTL_ALL_NOTES_OFF;
+		write_immediate_event(3, ev);
+		ev[1] = MIDI_CTL_RESET_CONTROLLERS;
+		write_immediate_event(3, ev);
+	}
+}
 
-				assert(y >= 0.0);
-				assert(y <= 127.0);
+/** \return true on success, false on failure (no buffer space left)
+ */
+bool
+MidiTrack::write_immediate_event(size_t size, const uint8_t* buf)
+{
+	if (!Evoral::midi_event_is_valid(buf, size)) {
+		cerr << "WARNING: Ignoring illegal immediate MIDI event" << endl;
+		return false;
+	}
+	const uint32_t type = EventTypeMap::instance().midi_event_type(buf[0]);
+	return (_immediate_events.write(0, type, size, buf) == size);
+}
 
-				ev.time = stamp;
-				ev.buffer[1] = (Byte)list->parameter().id();
-				ev.buffer[2] = (Byte)y;
+void
+MidiTrack::MidiControl::set_value(double val)
+{
+	bool valid = false;
+	if (std::isinf(val)) {
+		cerr << "MIDIControl value is infinity" << endl;
+	} else if (std::isnan(val)) {
+		cerr << "MIDIControl value is NaN" << endl;
+	} else if (val < _list->parameter().min()) {
+		cerr << "MIDIControl value is < " << _list->parameter().min() << endl;
+	} else if (val > _list->parameter().max()) {
+		cerr << "MIDIControl value is > " << _list->parameter().max() << endl;
+	} else {
+		valid = true;
+	}
 
-				cc_buf.push_back(ev);
+	if (!valid) {
+		return;
+	}
 
-				start = x;
-			}
+	assert(val <= _list->parameter().max());
+	if ( ! automation_playback()) {
+		size_t size = 3;
+		uint8_t ev[3] = { _list->parameter().channel(), uint8_t (val), 0 };
+		switch(_list->parameter().type()) {
+		case MidiCCAutomation:
+			ev[0] += MIDI_CMD_CONTROL;
+			ev[1] = _list->parameter().id();
+			ev[2] = int(val);
+			break;
+
+		case MidiPgmChangeAutomation:
+			size = 2;
+			ev[0] += MIDI_CMD_PGM_CHANGE;
+			ev[1] = int(val);
+			break;
+
+		case MidiChannelPressureAutomation:
+			size = 2;
+			ev[0] += MIDI_CMD_CHANNEL_PRESSURE;
+			ev[1] = int(val);
+			break;
+
+		case MidiPitchBenderAutomation:
+			ev[0] += MIDI_CMD_BENDER;
+			ev[1] = 0x7F & int(val);
+			ev[2] = 0x7F & (int(val) >> 7);
+			break;
+
+		default:
+			assert(false);
 		}
+		_route->write_immediate_event(size,  ev);
 	}
 
-	/* FIXME: too much copying! */
+	AutomationControl::set_value(val);
+}
 
-	// Merge cc buf into output
-	if (cc_buf.size() > 0) {
+void
+MidiTrack::set_step_editing (bool yn)
+{
+	if (_session.record_status() != Session::Disabled) {
+		return;
+	}
 
-		// Both CC and route, must merge
-		if (output_buf.size() > 0) {
+	if (yn != _step_editing) {
+		_step_editing = yn;
+		StepEditStatusChange (yn);
+	}
+}
 
-			MidiBuffer& mix_buf = mix_buffers.get_midi(1);
-			mix_buf.merge(output_buf, cc_buf);
-			output_buf.copy(mix_buf);
+boost::shared_ptr<SMFSource>
+MidiTrack::write_source (uint32_t)
+{
+	return midi_diskstream()->write_source ();
+}
 
-		} else {
-			output_buf.copy(cc_buf);
-		}
-	}
+void
+MidiTrack::set_playback_channel_mode(ChannelMode mode, uint16_t mask) 
+{
+	ChannelMode old = get_playback_channel_mode ();
+	uint16_t old_mask = get_playback_channel_mask ();
 
-	// Append immediate events (UI controls)
-	_immediate_events.read(output_buf, 0, 0, offset + nframes-1); // all stamps = 0
+	if (old != mode || mask != old_mask) {
+		_set_playback_channel_mode (mode, mask);
+		PlaybackChannelModeChanged ();
+		_session.set_dirty ();
+	}
 }
 
-int
-MidiTrack::export_stuff (BufferSet& bufs, nframes_t nframes, nframes_t end_frame)
+void
+MidiTrack::set_capture_channel_mode(ChannelMode mode, uint16_t mask) 
 {
-	return -1;
+	ChannelMode old = get_capture_channel_mode ();
+	uint16_t old_mask = get_capture_channel_mask ();
+
+	if (old != mode || mask != old_mask) {
+		_set_capture_channel_mode (mode, mask);
+		CaptureChannelModeChanged ();
+		_session.set_dirty ();
+	}
 }
 
 void
-MidiTrack::set_latency_delay (nframes_t longest_session_latency)
+MidiTrack::set_playback_channel_mask (uint16_t mask)
 {
-	Route::set_latency_delay (longest_session_latency);
-	_diskstream->set_roll_delay (_roll_delay);
+	uint16_t old = get_playback_channel_mask();
+
+	if (old != mask) {
+		_set_playback_channel_mask (mask);
+		PlaybackChannelMaskChanged ();
+		_session.set_dirty ();
+	}
 }
 
 void
-MidiTrack::bounce (InterThreadInfo& itt)
+MidiTrack::set_capture_channel_mask (uint16_t mask)
 {
-	throw;
-	//vector<MidiSource*> srcs;
-	//_session.write_one_midi_track (*this, 0, _session.current_end_frame(), false, srcs, itt);
+	uint16_t old = get_capture_channel_mask();
+
+	if (old != mask) {
+		_set_capture_channel_mask (mask);
+		CaptureChannelMaskChanged ();
+		_session.set_dirty ();
+	}
 }
 
+boost::shared_ptr<MidiPlaylist>
+MidiTrack::midi_playlist ()
+{
+	return midi_diskstream()->midi_playlist ();
+}
 
 void
-MidiTrack::bounce_range (nframes_t start, nframes_t end, InterThreadInfo& itt)
+MidiTrack::diskstream_data_recorded (boost::weak_ptr<MidiSource> src)
 {
-	throw;
-	//vector<MidiSource*> srcs;
-	//_session.write_one_midi_track (*this, start, end, false, srcs, itt);
+	DataRecorded (src); /* EMIT SIGNAL */
 }
 
-void
-MidiTrack::freeze (InterThreadInfo& itt)
+bool
+MidiTrack::input_active () const
 {
+	return _input_active;
 }
 
 void
-MidiTrack::unfreeze ()
+MidiTrack::set_input_active (bool yn)
 {
-	_freeze_record.state = UnFrozen;
-	FreezeChange (); /* EMIT SIGNAL */
+	if (yn != _input_active) {
+		_input_active = yn;
+		map_input_active (yn);
+		InputActiveChanged (); /* EMIT SIGNAL */
+	}
 }
 
-int
-MidiTrack::set_mode (TrackMode m)
+void
+MidiTrack::map_input_active (bool yn)
 {
-	assert(_diskstream);
+	if (!_input) {
+		return;
+	}
 
-	if (m != _mode) {
+	PortSet& ports (_input->ports());
 
-		if (_diskstream->set_destructive (m == Destructive)) {
-			return -1;
+	for (PortSet::iterator p = ports.begin(DataType::MIDI); p != ports.end(DataType::MIDI); ++p) {
+		boost::shared_ptr<MidiPort> mp = boost::dynamic_pointer_cast<MidiPort> (*p);
+		if (yn != mp->input_active()) {
+			mp->set_input_active (yn);
 		}
+	}
+}
 
-		_mode = m;
-		
-		TrackModeChanged (); /* EMIT SIGNAL */
+void
+MidiTrack::track_input_active (IOChange change, void* /* src */)
+{
+	if (change.type & IOChange::ConfigurationChanged) {
+		map_input_active (_input_active);
 	}
+}
 
-	return 0;
+boost::shared_ptr<Diskstream>
+MidiTrack::diskstream_factory (XMLNode const & node)
+{
+	return boost::shared_ptr<Diskstream> (new MidiDiskstream (_session, node));
 }
-	
-/** \return true on success, false on failure (no buffer space left)
- */
-bool
-MidiTrack::write_immediate_event(size_t size, const Byte* buf)
+
+boost::shared_ptr<MidiBuffer>
+MidiTrack::get_gui_feed_buffer () const
 {
-	return (_immediate_events.write(0, size, buf) == size);
+	return midi_diskstream()->get_gui_feed_buffer ();
 }
 
 void
-MidiTrack::MidiControl::set_value(float val)
+MidiTrack::act_on_mute ()
 {
-	assert(val >= 0);
-	assert(val <= 127.0);
+	/* this is called right after our mute status has changed.
+	   if we are now muted, send suitable output to shutdown
+	   all our notes.
 
-	boost::shared_ptr<MidiTrack> midi_track = _route.lock();
+	   XXX we should should also stop all relevant note trackers.
+	*/
 
-	if (midi_track && !_list->automation_playback()) {
-		Byte ev[3] = { MIDI_CMD_CONTROL, _list->parameter().id(), (int)val };
-		midi_track->write_immediate_event(3,  ev);
+	/* If we haven't got a diskstream yet, there's nothing to worry about,
+	   and we can't call get_channel_mask() anyway.
+	*/
+	if (!midi_diskstream()) {
+		return;
 	}
 
-	AutomationControl::set_value(val);
-} 
+	if (muted()) {
+		/* only send messages for channels we are using */
+
+		uint16_t mask = get_playback_channel_mask();
+
+		for (uint8_t channel = 0; channel <= 0xF; channel++) {
+
+			if ((1<<channel) & mask) {
+
+				DEBUG_TRACE (DEBUG::MidiIO, string_compose ("%1 delivers mute message to channel %2\n", name(), channel+1));
+				uint8_t ev[3] = { ((uint8_t) (MIDI_CMD_CONTROL | channel)), MIDI_CTL_SUSTAIN, 0 };
+				write_immediate_event (3, ev);
+				ev[1] = MIDI_CTL_ALL_NOTES_OFF;
+				write_immediate_event (3, ev);
+			}
+		}
+	}
+}
+	
+void
+MidiTrack::set_monitoring (MonitorChoice mc)
+{
+	if (mc != _monitoring) {
+
+		Track::set_monitoring (mc);
+		
+		/* monitoring state changed, so flush out any on notes at the
+		 * port level.
+		 */
+
+		PortSet& ports (_output->ports());
+		
+		for (PortSet::iterator p = ports.begin(); p != ports.end(); ++p) {
+			boost::shared_ptr<MidiPort> mp = boost::dynamic_pointer_cast<MidiPort> (*p);
+			if (mp) {
+				mp->require_resolve ();
+			}
+		}
+
+		boost::shared_ptr<MidiDiskstream> md (midi_diskstream());
+		
+		if (md) {
+			md->reset_tracker ();
+		}
+	}
+}
+
+MonitorState
+MidiTrack::monitoring_state () const
+{
+	MonitorState ms = Track::monitoring_state();
+	if (ms == MonitoringSilence) {
+		return MonitoringInput;
+	} 
+	return ms;
+}