/*
    Copyright (C) 2000-2002 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.
*/

#ifndef __ardour_route_h__
#define __ardour_route_h__

#include <cmath>
#include <cstring>
#include <list>
#include <map>
#include <set>
#include <string>

#include <boost/shared_ptr.hpp>
#include <boost/weak_ptr.hpp>
#include <boost/enable_shared_from_this.hpp>

#include <glibmm/threads.h>
#include "pbd/fastlog.h"
#include "pbd/xml++.h"
#include "pbd/undo.h"
#include "pbd/stateful.h"
#include "pbd/controllable.h"
#include "pbd/destructible.h"

#include "ardour/ardour.h"
#include "ardour/gain_control.h"
#include "ardour/instrument_info.h"
#include "ardour/io.h"
#include "ardour/io_vector.h"
#include "ardour/libardour_visibility.h"
#include "ardour/types.h"
#include "ardour/monitorable.h"
#include "ardour/muteable.h"
#include "ardour/mute_master.h"
#include "ardour/mute_control.h"
#include "ardour/route_group_member.h"
#include "ardour/stripable.h"
#include "ardour/graphnode.h"
#include "ardour/automatable.h"
#include "ardour/unknown_processor.h"
#include "ardour/soloable.h"
#include "ardour/solo_control.h"
#include "ardour/solo_safe_control.h"
#include "ardour/slavable.h"

class RoutePinWindowProxy;

namespace ARDOUR {

class Amp;
class DelayLine;
class Delivery;
class IOProcessor;
class Panner;
class PannerShell;
class PortSet;
class Processor;
class PluginInsert;
class RouteGroup;
class Send;
class InternalReturn;
class MonitorProcessor;
class Pannable;
class CapturingProcessor;
class InternalSend;
class VCA;
class SoloIsolateControl;
class PhaseControl;
class MonitorControl;

class LIBARDOUR_API Route : public Stripable,
                            public GraphNode,
                            public Soloable,
                            public Muteable,
                            public Monitorable,
                            public Automatable,
                            public RouteGroupMember,
                            public boost::enable_shared_from_this<Route>
{
public:

	typedef std::list<boost::shared_ptr<Processor> > ProcessorList;

	Route (Session&, std::string name, PresentationInfo::Flag flags = PresentationInfo::Flag(0), DataType default_type = DataType::AUDIO);
	virtual ~Route();

	virtual int init ();

	boost::shared_ptr<IO> input() const { return _input; }
	boost::shared_ptr<IO> output() const { return _output; }
	IOVector all_inputs () const;
	IOVector all_outputs () const;

	ChanCount n_inputs() const { return _input->n_ports(); }
	ChanCount n_outputs() const { return _output->n_ports(); }

	bool active() const { return _active; }
	void set_active (bool yn, void *);

	static std::string ensure_track_or_route_name(std::string, Session &);

	std::string comment() { return _comment; }
	void set_comment (std::string str, void *src);

	bool set_name (const std::string& str);
	static void set_name_in_state (XMLNode &, const std::string &, bool rename_playlist = true);

	MonitorState monitoring_state () const;
	virtual MeterState metering_state () const;

	/* these are the core of the API of a Route. see the protected sections as well */

	virtual int roll (pframes_t nframes, framepos_t start_frame, framepos_t end_frame,
	                  int declick, bool& need_butler);

	virtual int no_roll (pframes_t nframes, framepos_t start_frame, framepos_t end_frame,
	                     bool state_changing);

	virtual int silent_roll (pframes_t nframes, framepos_t start_frame, framepos_t end_frame,
	                         bool& need_butler);

	virtual bool can_record() { return false; }

	virtual void nonrealtime_handle_transport_stopped (bool abort, bool did_locate, bool flush_processors);
	virtual void realtime_handle_transport_stopped () {}
	virtual void realtime_locate () {}
	virtual void non_realtime_locate (framepos_t);
	virtual void set_pending_declick (int);

	/* end of vfunc-based API */

	void shift (framepos_t, framecnt_t);

	void set_trim (gain_t val, PBD::Controllable::GroupControlDisposition);

	/* controls use set_solo() to modify this route's solo state
	 */

	void clear_all_solo_state ();

	bool soloed_by_others () const { return _solo_control->soloed_by_others(); }
	bool soloed_by_others_upstream () const { return _solo_control->soloed_by_others_upstream(); }
	bool soloed_by_others_downstream () const { return _solo_control->soloed_by_others_downstream(); }
	bool self_soloed () const { return _solo_control->self_soloed(); }
	bool soloed () const { return self_soloed () || soloed_by_others (); }

	void push_solo_upstream (int32_t delta);
	void push_solo_isolate_upstream (int32_t delta);
	bool can_solo () const {
		return !(is_master() || is_monitor() || is_auditioner());
	}
	bool is_safe () const {
		return _solo_safe_control->get_value();
	}
	void enable_monitor_send ();

	void set_denormal_protection (bool yn);
	bool denormal_protection() const;

	void         set_meter_point (MeterPoint, bool force = false);
	bool         apply_processor_changes_rt ();
	void         emit_pending_signals ();
	MeterPoint   meter_point() const { return _pending_meter_point; }

	void         set_meter_type (MeterType t) { _meter_type = t; }
	MeterType    meter_type() const { return _meter_type; }

	/* Processors */

	boost::shared_ptr<Amp> amp() const  { return _amp; }
	boost::shared_ptr<Amp> trim() const { return _trim; }
	boost::shared_ptr<PeakMeter>       peak_meter()       { return _meter; }
	boost::shared_ptr<const PeakMeter> peak_meter() const { return _meter; }
	boost::shared_ptr<PeakMeter> shared_peak_meter() const { return _meter; }
	boost::shared_ptr<DelayLine> delay_line() const  { return _delayline; }

	void flush_processors ();

	void foreach_processor (boost::function<void(boost::weak_ptr<Processor>)> method) {
		Glib::Threads::RWLock::ReaderLock lm (_processor_lock);
		for (ProcessorList::iterator i = _processors.begin(); i != _processors.end(); ++i) {
			method (boost::weak_ptr<Processor> (*i));
		}
	}

	boost::shared_ptr<Processor> nth_processor (uint32_t n) {
		Glib::Threads::RWLock::ReaderLock lm (_processor_lock);
		ProcessorList::iterator i;
		for (i = _processors.begin(); i != _processors.end() && n; ++i, --n) {}
		if (i == _processors.end()) {
			return boost::shared_ptr<Processor> ();
		} else {
			return *i;
		}
	}

	boost::shared_ptr<Processor> processor_by_id (PBD::ID) const;

	boost::shared_ptr<Processor> nth_plugin (uint32_t n) const;
	boost::shared_ptr<Processor> nth_send (uint32_t n) const;

	bool has_io_processor_named (const std::string&);
	ChanCount max_processor_streams () const { return processor_max_streams; }

	std::list<std::string> unknown_processors () const;

	RoutePinWindowProxy * pinmgr_proxy () const { return _pinmgr_proxy; }
	void set_pingmgr_proxy (RoutePinWindowProxy* wp) { _pinmgr_proxy = wp ; }

	/* special processors */

	boost::shared_ptr<InternalSend>     monitor_send() const { return _monitor_send; }
	/** the signal processorat at end of the processing chain which produces output */
	boost::shared_ptr<Delivery>         main_outs() const { return _main_outs; }
	boost::shared_ptr<InternalReturn>   internal_return() const { return _intreturn; }
	boost::shared_ptr<MonitorProcessor> monitor_control() const { return _monitor_control; }
	boost::shared_ptr<Send>             internal_send_for (boost::shared_ptr<const Route> target) const;
	void add_internal_return ();
	void add_send_to_internal_return (InternalSend *);
	void remove_send_from_internal_return (InternalSend *);
	void listen_position_changed ();
	boost::shared_ptr<CapturingProcessor> add_export_point(/* Add some argument for placement later */);

	/** A record of the stream configuration at some point in the processor list.
	 * Used to return where and why an processor list configuration request failed.
	 */
	struct ProcessorStreams {
		ProcessorStreams(size_t i=0, ChanCount c=ChanCount()) : index(i), count(c) {}

		uint32_t  index; ///< Index of processor where configuration failed
		ChanCount count; ///< Input requested of processor
	};

	int add_processor (boost::shared_ptr<Processor>, Placement placement, ProcessorStreams* err = 0, bool activation_allowed = true);
	int add_processor_by_index (boost::shared_ptr<Processor>, int, ProcessorStreams* err = 0, bool activation_allowed = true);
	int add_processor (boost::shared_ptr<Processor>, boost::shared_ptr<Processor>, ProcessorStreams* err = 0, bool activation_allowed = true);
	int add_processors (const ProcessorList&, boost::shared_ptr<Processor>, ProcessorStreams* err = 0);
	boost::shared_ptr<Processor> before_processor_for_placement (Placement);
	boost::shared_ptr<Processor> before_processor_for_index (int);
	bool processors_reorder_needs_configure (const ProcessorList& new_order);
	/** remove plugin/processor
	 *
	 * @param proc processor to remove
	 * @param err error report (index where removal vailed, channel-count why it failed) may be nil
	 * @param need_process_lock if locking is required (set to true, unless called from RT context with lock)
	 * @returns 0 on success
	 */
	int remove_processor (boost::shared_ptr<Processor> proc, ProcessorStreams* err = 0, bool need_process_lock = true);
	/** replace plugin/processor with another
	 *
	 * @param old processor to remove
	 * @param sub processor to substitute the old one with
	 * @param err error report (index where removal vailed, channel-count why it failed) may be nil
	 * @returns 0 on success
	 */
	int replace_processor (boost::shared_ptr<Processor> old, boost::shared_ptr<Processor> sub, ProcessorStreams* err = 0);
	int remove_processors (const ProcessorList&, ProcessorStreams* err = 0);
	int reorder_processors (const ProcessorList& new_order, ProcessorStreams* err = 0);
	void disable_processors (Placement);
	void disable_processors ();
	void disable_plugins (Placement);
	void disable_plugins ();
	void ab_plugins (bool forward);
	void clear_processors (Placement);
	void all_visible_processors_active (bool);

	bool strict_io () const { return _strict_io; }
	bool set_strict_io (bool);
	/** reset plugin-insert configuration to default, disable customizations.
	 *
	 * This is equivalent to calling
	 * @code
	 * customize_plugin_insert (proc, 0, unused)
	 * @endcode
	 *
	 * @param proc Processor to reset
	 * @returns true if successful
	 */
	bool reset_plugin_insert (boost::shared_ptr<Processor> proc);
	/** enable custom plugin-insert configuration
	 * @param proc Processor to customize
	 * @param count number of plugin instances to use (if zero, reset to default)
	 * @param outs output port customization
	 * @param sinks input pins for variable-I/O plugins
	 * @returns true if successful
	 */
	bool customize_plugin_insert (boost::shared_ptr<Processor> proc, uint32_t count, ChanCount outs, ChanCount sinks);
	bool add_remove_sidechain (boost::shared_ptr<Processor> proc, bool);
	bool plugin_preset_output (boost::shared_ptr<Processor> proc, ChanCount outs);

	/* enable sidechain input for a given processor
	 *
	 * The sidechain itself is an IO port object with variable number of channels and configured independently.
	 * Adding/removing the port itself however requires reconfiguring the route and is hence
	 * not a plugin operation itself.
	 *
	 * @param proc the processor to add sidechain inputs to
	 * @returns true on success
	 */
	bool add_sidechain (boost::shared_ptr<Processor> proc) { return add_remove_sidechain (proc, true); }
	/* remove sidechain input from given processor
	 * @param proc the processor to remove the sidechain input from
	 * @returns true on success
	 */
	bool remove_sidechain (boost::shared_ptr<Processor> proc) { return add_remove_sidechain (proc, false); }

	framecnt_t set_private_port_latencies (bool playback) const;
	void       set_public_port_latencies (framecnt_t, bool playback) const;

	framecnt_t   update_signal_latency();
	virtual void set_latency_compensation (framecnt_t);

	void set_user_latency (framecnt_t);
	framecnt_t initial_delay() const { return _initial_delay; }
	framecnt_t signal_latency() const { return _signal_latency; }

	PBD::Signal0<void>       active_changed;
	PBD::Signal0<void>       denormal_protection_changed;
	PBD::Signal0<void>       comment_changed;

	/** track numbers - assigned by session
	 * nubers > 0 indicate tracks (audio+midi)
	 * nubers < 0 indicate busses
	 * zero is reserved for unnumbered special busses.
	 * */
	PBD::Signal0<void> track_number_changed;
	int64_t track_number() const { return _track_number; }

	void set_track_number(int64_t tn) {
		if (tn == _track_number) { return; }
		_track_number = tn;
		track_number_changed();
		PropertyChanged (ARDOUR::Properties::name);
	}

	enum PluginSetupOptions {
		None = 0x0,
		CanReplace = 0x1,
		MultiOut = 0x2,
	};

	static PBD::Signal3<int,boost::shared_ptr<Route>, boost::shared_ptr<PluginInsert>, PluginSetupOptions > PluginSetup;

	/** the processors have changed; the parameter indicates what changed */
	PBD::Signal1<void,RouteProcessorChange> processors_changed;
	PBD::Signal1<void,void*> record_enable_changed;
	PBD::Signal0<void> processor_latency_changed;
	/** the metering point has changed */
	PBD::Signal0<void>       meter_change;
	PBD::Signal0<void>       signal_latency_changed;
	PBD::Signal0<void>       initial_delay_changed;

	/** Emitted with the process lock held */
	PBD::Signal0<void>       io_changed;

	/* stateful */

	XMLNode& get_state();
	virtual int set_state (const XMLNode&, int version);
	virtual XMLNode& get_template();

	XMLNode& get_processor_state ();
	virtual void set_processor_state (const XMLNode&);

	int save_as_template (const std::string& path, const std::string& name);

	PBD::Signal1<void,void*> SelectedChanged;

	int add_aux_send (boost::shared_ptr<Route>, boost::shared_ptr<Processor>);
	void remove_aux_or_listen (boost::shared_ptr<Route>);

	/**
	 * return true if this route feeds the first argument via at least one
	 * (arbitrarily long) signal pathway.
	 */
	bool feeds (boost::shared_ptr<Route>, bool* via_send_only = 0);

	/**
	 * return true if this route feeds the first argument directly, via
	 * either its main outs or a send.  This is checked by the actual
	 * connections, rather than by what the graph is currently doing.
	 */
	bool direct_feeds_according_to_reality (boost::shared_ptr<Route>, bool* via_send_only = 0);

	/**
	 * return true if this route feeds the first argument directly, via
	 * either its main outs or a send, according to the graph that
	 * is currently being processed.
	 */
	bool direct_feeds_according_to_graph (boost::shared_ptr<Route>, bool* via_send_only = 0);

	bool feeds_according_to_graph (boost::shared_ptr<Route>);

	struct FeedRecord {
		boost::weak_ptr<Route> r;
		bool sends_only;

		FeedRecord (boost::shared_ptr<Route> rp, bool sendsonly)
		: r (rp)
		, sends_only (sendsonly) {}
	};

	struct FeedRecordCompare {
		bool operator() (const FeedRecord& a, const FeedRecord& b) const {
			return a.r < b.r;
		}
	};

	typedef std::set<FeedRecord,FeedRecordCompare> FedBy;

	const FedBy& fed_by() const { return _fed_by; }
	void clear_fed_by ();
	bool add_fed_by (boost::shared_ptr<Route>, bool sends_only);

	/* Controls (not all directly owned by the Route) */

	boost::shared_ptr<AutomationControl> get_control (const Evoral::Parameter& param);

	boost::shared_ptr<SoloControl> solo_control() const {
		return _solo_control;
	}

	boost::shared_ptr<MuteControl> mute_control() const {
		return _mute_control;
	}

	bool can_be_muted_by_others () const { return can_solo(); }
	bool muted () const { return _mute_control->muted(); }
	bool muted_by_masters () const { return _mute_control->muted_by_masters(); }
	bool muted_by_self () const { return _mute_control->muted_by_self(); }
	bool muted_by_others_soloing () const;

	boost::shared_ptr<SoloIsolateControl> solo_isolate_control() const {
		return _solo_isolate_control;
	}

	boost::shared_ptr<SoloSafeControl> solo_safe_control() const {
		return _solo_safe_control;
	}

	boost::shared_ptr<MonitorControl> monitoring_control() const {
		/* tracks override this to provide actual monitoring control;
		   busses have no possible choices except input monitoring.
		*/
		return boost::shared_ptr<MonitorControl> ();
	}

	/* Route doesn't own these items, but sub-objects that it does own have them
	   and to make UI code a bit simpler, we provide direct access to them
	   here.
	*/

	boost::shared_ptr<Panner> panner() const;  /* may return null */
	boost::shared_ptr<PannerShell> panner_shell() const;
	boost::shared_ptr<Pannable> pannable() const;

	boost::shared_ptr<GainControl> gain_control() const;
	boost::shared_ptr<GainControl> trim_control() const;
	boost::shared_ptr<PhaseControl> phase_control() const;

	/**
	   Return the first processor that accepts has at least one MIDI input
	   and at least one audio output. In the vast majority of cases, this
	   will be "the instrument". This does not preclude other MIDI->audio
	   processors later in the processing chain, but that would be a
	   special case not covered by this utility function.
	*/
	boost::shared_ptr<Processor> the_instrument() const;
	InstrumentInfo& instrument_info() { return _instrument_info; }

	/* "well-known" controls for panning. Any or all of these may return
	 * null.
	 */

	boost::shared_ptr<AutomationControl> pan_azimuth_control() const;
	boost::shared_ptr<AutomationControl> pan_elevation_control() const;
	boost::shared_ptr<AutomationControl> pan_width_control() const;
	boost::shared_ptr<AutomationControl> pan_frontback_control() const;
	boost::shared_ptr<AutomationControl> pan_lfe_control() const;

	/* "well-known" controls for an EQ in this route. Any or all may
	 * be null. eq_band_cnt() must return 0 if there is no EQ present.
	 * Passing an @param band value >= eq_band_cnt() will guarantee the
	 * return of a null ptr (or an empty string for eq_band_name()).
	 */
	uint32_t eq_band_cnt () const;
	std::string eq_band_name (uint32_t) const;
	boost::shared_ptr<AutomationControl> eq_gain_controllable (uint32_t band) const;
	boost::shared_ptr<AutomationControl> eq_freq_controllable (uint32_t band) const;
	boost::shared_ptr<AutomationControl> eq_q_controllable (uint32_t band) const;
	boost::shared_ptr<AutomationControl> eq_shape_controllable (uint32_t band) const;
	boost::shared_ptr<AutomationControl> eq_enable_controllable () const;
	boost::shared_ptr<AutomationControl> eq_hpf_controllable () const;

	/* "well-known" controls for a compressor in this route. Any or all may
	 * be null.
	 */
	boost::shared_ptr<AutomationControl> comp_enable_controllable () const;
	boost::shared_ptr<AutomationControl> comp_threshold_controllable () const;
	boost::shared_ptr<AutomationControl> comp_speed_controllable () const;
	boost::shared_ptr<AutomationControl> comp_mode_controllable () const;
	boost::shared_ptr<AutomationControl> comp_makeup_controllable () const;
	boost::shared_ptr<AutomationControl> comp_redux_controllable () const;

	/* @param mode must be supplied by the comp_mode_controllable(). All other values
	 * result in undefined behaviour
	 */
	std::string comp_mode_name (uint32_t mode) const;
	/* @param mode - as for comp mode name. This returns the name for the
	 * parameter/control accessed via comp_speed_controllable(), which can
	 * be mode dependent.
	 */
	std::string comp_speed_name (uint32_t mode) const;

	/* "well-known" controls for sends to well-known busses in this route. Any or all may
	 * be null.
	 *
	 * In Mixbus, these are the sends that connect to the mixbusses.
	 * In Ardour, these are user-created sends that connect to user-created
	 * Aux busses.
	 */
	boost::shared_ptr<AutomationControl> send_level_controllable (uint32_t n) const;
	boost::shared_ptr<AutomationControl> send_enable_controllable (uint32_t n) const;
	/* for the same value of @param n, this returns the name of the send
	 * associated with the pair of controllables returned by the above two methods.
	 */
	std::string send_name (uint32_t n) const;

	/* well known control that enables/disables sending to the master bus.
	 *
	 * In Ardour, this returns null.
	 * In Mixbus, it will return a suitable control, or null depending on
	 * the route.
	 */
	boost::shared_ptr<AutomationControl> master_send_enable_controllable () const;

	void protect_automation ();

	bool has_external_redirects() const;

	/* can only be executed by a route for which is_monitor() is true
	 *	 (i.e. the monitor out)
	 */
	void monitor_run (framepos_t start_frame, framepos_t end_frame,
			pframes_t nframes, int declick);

        bool slaved_to (boost::shared_ptr<VCA>) const;
        bool slaved () const;

  protected:
        friend class Session;

	void catch_up_on_solo_mute_override ();
	void set_listen (bool);

	void curve_reallocate ();
	virtual void set_block_size (pframes_t nframes);

  protected:
        virtual framecnt_t check_initial_delay (framecnt_t nframes, framepos_t&) { return nframes; }

	void fill_buffers_with_input (BufferSet& bufs, boost::shared_ptr<IO> io, pframes_t nframes);

	void passthru (BufferSet&, framepos_t start_frame, framepos_t end_frame,
			pframes_t nframes, int declick);

	virtual void write_out_of_band_data (BufferSet& /* bufs */, framepos_t /* start_frame */, framepos_t /* end_frame */,
					     framecnt_t /* nframes */) {}

	virtual void process_output_buffers (BufferSet& bufs,
	                                     framepos_t start_frame, framepos_t end_frame,
	                                     pframes_t nframes, int declick,
	                                     bool gain_automation_ok);

	void flush_processor_buffers_locked (framecnt_t nframes);

	virtual void bounce_process (BufferSet& bufs,
	                             framepos_t start_frame, framecnt_t nframes,
															 boost::shared_ptr<Processor> endpoint, bool include_endpoint,
	                             bool for_export, bool for_freeze);

	framecnt_t   bounce_get_latency (boost::shared_ptr<Processor> endpoint, bool include_endpoint, bool for_export, bool for_freeze) const;
	ChanCount    bounce_get_output_streams (ChanCount &cc, boost::shared_ptr<Processor> endpoint, bool include_endpoint, bool for_export, bool for_freeze) const;

	boost::shared_ptr<IO> _input;
	boost::shared_ptr<IO> _output;

	bool           _active;
	framecnt_t     _signal_latency;
	framecnt_t     _signal_latency_at_amp_position;
	framecnt_t     _signal_latency_at_trim_position;
	framecnt_t     _initial_delay;
	framecnt_t     _roll_delay;

	ProcessorList  _processors;
	mutable Glib::Threads::RWLock   _processor_lock;
	boost::shared_ptr<Delivery> _main_outs;
	boost::shared_ptr<InternalSend> _monitor_send;
	boost::shared_ptr<InternalReturn> _intreturn;
	boost::shared_ptr<MonitorProcessor> _monitor_control;
	boost::shared_ptr<Pannable> _pannable;

	enum {
		EmitNone = 0x00,
		EmitMeterChanged = 0x01,
		EmitMeterVisibilityChange = 0x02,
		EmitRtProcessorChange = 0x04
	};

	ProcessorList  _pending_processor_order;
	gint           _pending_process_reorder; // atomic
	gint           _pending_signals; // atomic

	int            _pending_declick;
	MeterPoint     _meter_point;
	MeterPoint     _pending_meter_point;
	MeterType      _meter_type;

	bool           _denormal_protection;

	bool _recordable : 1;
	bool _silent : 1;
	bool _declickable : 1;

	boost::shared_ptr<SoloControl> _solo_control;
	boost::shared_ptr<MuteControl> _mute_control;
	boost::shared_ptr<PhaseControl> _phase_control;
	boost::shared_ptr<SoloIsolateControl> _solo_isolate_control;
	boost::shared_ptr<SoloSafeControl> _solo_safe_control;

	std::string    _comment;
	bool           _have_internal_generator;
	DataType       _default_type;
	FedBy          _fed_by;

	InstrumentInfo _instrument_info;

	virtual ChanCount input_streams () const;

protected:
	virtual XMLNode& state(bool);

	int configure_processors (ProcessorStreams*);

	void passthru_silence (framepos_t start_frame, framepos_t end_frame,
	                       pframes_t nframes, int declick);

	void silence (framecnt_t);
	void silence_unlocked (framecnt_t);

	ChanCount processor_max_streams;
	ChanCount processor_out_streams;

	uint32_t pans_required() const;
	ChanCount n_process_buffers ();

	virtual void maybe_declick (BufferSet&, framecnt_t, int);

	boost::shared_ptr<GainControl> _gain_control;
	boost::shared_ptr<Amp>       _amp;
	boost::shared_ptr<GainControl> _trim_control;
	boost::shared_ptr<Amp>       _trim;
	boost::shared_ptr<PeakMeter> _meter;
	boost::shared_ptr<DelayLine> _delayline;

	boost::shared_ptr<Processor> the_instrument_unlocked() const;

  private:
	int64_t _track_number;

	int set_state_2X (const XMLNode&, int);
	void set_processor_state_2X (XMLNodeList const &, int);

	void input_change_handler (IOChange, void *src);
	void output_change_handler (IOChange, void *src);
	void sidechain_change_handler (IOChange, void *src);

	void processor_selfdestruct (boost::weak_ptr<Processor>);
	std::vector<boost::weak_ptr<Processor> > selfdestruct_sequence;
	Glib::Threads::Mutex  selfdestruct_lock;

	bool input_port_count_changing (ChanCount);
	bool output_port_count_changing (ChanCount);

	bool _in_configure_processors;
	bool _initial_io_setup;
	bool _in_sidechain_setup;

	int configure_processors_unlocked (ProcessorStreams*, Glib::Threads::RWLock::WriterLock*);
	bool set_meter_point_unlocked ();
	void apply_processor_order (const ProcessorList& new_order);

	std::list<std::pair<ChanCount, ChanCount> > try_configure_processors (ChanCount, ProcessorStreams *);
	std::list<std::pair<ChanCount, ChanCount> > try_configure_processors_unlocked (ChanCount, ProcessorStreams *);

	bool add_processor_from_xml_2X (const XMLNode&, int);

	void placement_range (Placement p, ProcessorList::iterator& start, ProcessorList::iterator& end);

	void set_self_solo (bool yn);

	void set_processor_positions ();
	framecnt_t update_port_latencies (PortSet& ports, PortSet& feeders, bool playback, framecnt_t) const;

	void setup_invisible_processors ();
	void unpan ();

	void set_plugin_state_dir (boost::weak_ptr<Processor>, const std::string&);

	boost::shared_ptr<CapturingProcessor> _capturing_processor;

	/** A handy class to keep processor state while we attempt a reconfiguration
	 *  that may fail.
	 */
	class ProcessorState {
	public:
		ProcessorState (Route* r)
			: _route (r)
			, _processors (r->_processors)
			, _processor_max_streams (r->processor_max_streams)
		{ }

		void restore () {
			_route->_processors = _processors;
			_route->processor_max_streams = _processor_max_streams;
		}

	private:
		/* this should perhaps be a shared_ptr, but ProcessorStates will
		   not hang around long enough for it to matter.
		*/
		Route* _route;
		ProcessorList _processors;
		ChanCount _processor_max_streams;
	};

	friend class ProcessorState;

	bool _strict_io;

	/* no copy construction */
	Route (Route const &);

	void maybe_note_meter_position ();

	/** true if we've made a note of a custom meter position in these variables */
	bool _custom_meter_position_noted;
	/** the processor that came after the meter when it was last set to a custom position,
	    or 0.
	*/
	boost::weak_ptr<Processor> _processor_after_last_custom_meter;
	RoutePinWindowProxy *_pinmgr_proxy;

	void reset_instrument_info ();

        void solo_control_changed (bool self, PBD::Controllable::GroupControlDisposition);
};

} // namespace ARDOUR

#endif /* __ardour_route_h__ */
