session_event.h

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/*
 * Copyright (C) 2009-2018 Paul Davis <paul@linuxaudiosystems.com>
 * Copyright (C) 2010-2012 Carl Hetherington <carl@carlh.net>
 * Copyright (C) 2010-2012 David Robillard <d@drobilla.net>
 * Copyright (C) 2015-2018 Robin Gareus <robin@gareus.org>
 *
 * 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.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 */
 
#pragma once
 
#include <list>
#include <memory>
 
 
#include "pbd/pool.h"
#include "pbd/ringbuffer.h"
#include "pbd/event_loop.h"
 
#include "ardour/libardour_visibility.h"
#include "ardour/types.h"
 
namespace ARDOUR {
 
class TransportMaster;
class Region;
class Track;
 
class LIBARDOUR_API SessionEvent {
public:
        enum Type {
                SetTransportSpeed,
                SetDefaultPlaySpeed,
                Locate,
                LocateRoll,
                LocateRollLocate,
                SetLoop,
                PunchIn,
                PunchOut,
                RangeStop,
                RangeLocate,
                Overwrite,
                OverwriteAll,
                Audition,
                SetPlayAudioRange,
                CancelPlayAudioRange,
                RealTimeOperation,
                AdjustPlaybackBuffering,
                AdjustCaptureBuffering,
                SetTimecodeTransmission,
                Skip,
                SetTransportMaster,
                StartRoll,
                EndRoll,
                TransportStateChange,
                SyncCues,
 
                /* only one of each of these events can be queued at any one time */
 
                AutoLoop,
        };
 
        enum Action {
                Add,
                Remove,
                Replace,
                Clear
        };
 
        Type       type;
        Action     action;
        samplepos_t action_sample;
        samplepos_t target_sample;
        double     speed;
 
        union {
                bool             yes_or_no;
                samplepos_t      target2_sample;
                OverwriteReason  overwrite;
                int32_t          scene;
        };
 
        std::weak_ptr<Track> track;
 
        union {
                bool second_yes_or_no;
                double control_value;
                LocateTransportDisposition locate_transport_disposition;
        };
 
        union {
                bool third_yes_or_no;
        };
 
        /* 5 members to handle a multi-group event handled in RT context */
 
        typedef std::function<void (SessionEvent*)> RTeventCallback;
 
        std::shared_ptr<AutomationControlList> controls; /* apply to */
        std::shared_ptr<RouteList> routes;     /* apply to */
        std::function<void (void)> rt_slot;    /* what to call in RT context */
        RTeventCallback              rt_return;  /* called after rt_slot, with this event as an argument */
        PBD::EventLoop*              event_loop;
 
        std::list<TimelineRange> audio_range;
        std::list<TimelineRange> music_range;
 
        std::shared_ptr<Region> region;
        std::shared_ptr<TransportMaster> transport_master;
 
        SessionEvent (Type t, Action a, samplepos_t when, samplepos_t where, double spd, bool yn = false, bool yn2 = false, bool yn3 = false);
 
        void set_track (std::shared_ptr<Track> t) {
                track = t;
        }
 
        bool before (const SessionEvent& other) const {
                return action_sample < other.action_sample;
        }
 
        bool after (const SessionEvent& other) const {
                return action_sample > other.action_sample;
        }
 
        static bool compare (const SessionEvent *e1, const SessionEvent *e2) {
                return e1->before (*e2);
        }
 
        void* operator new (size_t);
        void  operator delete (void *ptr, size_t /*size*/);
 
        static const samplepos_t Immediate = -1;
 
        static bool has_per_thread_pool ();
        static void create_per_thread_pool (const std::string& n, uint32_t nitems);
        static void init_event_pool ();
        static guint pool_available ();
 
        PBD::CrossThreadPool* event_pool() const { return own_pool; }
 
private:
        static PBD::PerThreadPool* pool;
        PBD::CrossThreadPool*      own_pool;
 
        friend class Butler;
};
 
class SessionEventManager {
public:
        SessionEventManager () : pending_events (2048),
                                 auto_loop_event(0), punch_out_event(0), punch_in_event(0) {}
        virtual ~SessionEventManager() {}
 
        virtual void queue_event (SessionEvent *ev) = 0;
        void clear_events (SessionEvent::Type type);
        void clear_events (SessionEvent::Type type, std::function<void (void)> after);
 
protected:
        PBD::RingBuffer<SessionEvent*> pending_events;
        typedef std::list<SessionEvent *> Events;
        Events           events;
        Events           immediate_events;
        Events::iterator next_event;
 
        Glib::Threads::Mutex rb_write_lock;
 
        /* there can only ever be one of each of these */
 
        SessionEvent *auto_loop_event;
        SessionEvent *punch_out_event;
        SessionEvent *punch_in_event;
 
        void dump_events () const;
        void merge_event (SessionEvent*);
        void replace_event (SessionEvent::Type, samplepos_t action_sample, samplepos_t target = 0);
        bool _replace_event (SessionEvent*);
        bool _remove_event (SessionEvent *);
        void _clear_event_type (SessionEvent::Type);
 
        void add_event (samplepos_t action_sample, SessionEvent::Type type, samplepos_t target_sample = 0);
        void remove_event (samplepos_t sample, SessionEvent::Type type);
 
        virtual void process_event(SessionEvent*) = 0;
        virtual void set_next_event () = 0;
};
 
} /* namespace */
 
LIBARDOUR_API std::ostream& operator<<(std::ostream&, const ARDOUR::SessionEvent&);