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    Copyright (C) 2000 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
    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.

    $Id: playlist.h,v 1.67 2006/03/20 22:14:25 sampo Exp $

#ifndef __ardour_playlist_h__
#define __ardour_playlist_h__

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

#include <sys/stat.h>

#include <sigc++/signal_system.h>
#include <pbd/atomic.h>
#include <pbd/undo.h>

#include <ardour/ardour.h>
#include <ardour/crossfade_compare.h>
#include <ardour/location.h>
#include <ardour/stateful.h>
#include <ardour/source.h>
#include <ardour/state_manager.h>

namespace ARDOUR  {

class Session;
class Region;

class Playlist : public Stateful, public StateManager {
      typedef list<Region*>    RegionList;

      Playlist (Session&, const XMLNode&, bool hidden = false);
      Playlist (Session&, string name, bool hidden = false);
      Playlist (const Playlist&, string name, bool hidden = false);
      Playlist (const Playlist&, jack_nframes_t start, jack_nframes_t cnt, string name, bool hidden = false);

      virtual jack_nframes_t read (Sample *dst, Sample *mixdown, float *gain_buffer, jack_nframes_t start, jack_nframes_t cnt, uint32_t chan_n=0) = 0;
      virtual void clear (bool with_delete = false, bool with_save = true);
      virtual void dump () const;
      virtual UndoAction get_memento() const = 0;

      void ref();
      void unref();
      uint32_t refcnt() const { return _refcnt; }

      const string& name() const { return _name; }
      void set_name (const string& str);

      bool frozen() const { return _frozen; }
      void set_frozen (bool yn);

      bool hidden() const { return _hidden; }
      bool empty() const;
      jack_nframes_t get_maximum_extent () const;
      layer_t top_layer() const;

      EditMode get_edit_mode() const { return _edit_mode; }
      void set_edit_mode (EditMode);

      /* Editing operations */

      void add_region (const Region&, jack_nframes_t position, float times = 1, bool with_save = true);
      void remove_region (Region *);
      void replace_region (Region& old, Region& newr, jack_nframes_t pos);
      void split_region (Region&, jack_nframes_t position);
      void partition (jack_nframes_t start, jack_nframes_t end, bool just_top_level);
      void duplicate (Region&, jack_nframes_t position, float times);
      void nudge_after (jack_nframes_t start, jack_nframes_t distance, bool forwards);

      Region* find_region (id_t) const;

      Playlist* cut  (list<AudioRange>&, bool result_is_hidden = true);
      Playlist* copy (list<AudioRange>&, bool result_is_hidden = true);
      int       paste (Playlist&, jack_nframes_t position, float times);

      uint32_t read_data_count() { return _read_data_count; }

      RegionList* regions_at (jack_nframes_t frame);
      RegionList* regions_touched (jack_nframes_t start, jack_nframes_t end);
      Region*     top_region_at (jack_nframes_t frame);

      Region*     find_next_region (jack_nframes_t frame, RegionPoint point, int dir);

      template<class T> void foreach_region (T *t, void (T::*func)(Region *, void *), void *arg);
      template<class T> void foreach_region (T *t, void (T::*func)(Region *));

      XMLNode& get_state ();
      int set_state (const XMLNode&);
      XMLNode& get_template ();

      SigC::Signal1<void,Region *> RegionAdded;
      SigC::Signal1<void,Region *> RegionRemoved;

      SigC::Signal2<void,Playlist*,bool> InUse;
      SigC::Signal0<void>            Modified;
      SigC::Signal0<void>            NameChanged;
      SigC::Signal0<void>            LengthChanged;
      SigC::Signal0<void>            LayeringChanged;
      SigC::Signal1<void,Playlist *> GoingAway;
      SigC::Signal0<void>            StatePushed;

      static SigC::Signal1<void,Playlist*> PlaylistCreated;

      static string bump_name (string old_name, Session&);
      static string bump_name_once (string old_name);

      void freeze ();
      void thaw ();

      void raise_region (Region&);
      void lower_region (Region&);
      void raise_region_to_top (Region&);
      void lower_region_to_bottom (Region&);

      uint32_t read_data_count() const { return _read_data_count; }

      Session& session() { return _session; }

      id_t get_orig_diskstream_id () const { return _orig_diskstream_id; }
      void set_orig_diskstream_id (id_t did) { _orig_diskstream_id = did; }  

      /* destructive editing */
      virtual bool destroy_region (Region *) = 0;

      friend class Session;
      virtual ~Playlist ();  /* members of the public use unref() */

      struct RegionLock {
          RegionLock (Playlist *pl, bool do_block_notify = true) : playlist (pl), block_notify (do_block_notify) {
                if (block_notify) {
          ~RegionLock() { 
                if (block_notify) {
                      playlist->release_notifications ();
          Playlist *playlist;
          bool block_notify;

      friend class RegionLock;

      RegionList       regions;
      string          _name;
      Session&        _session;
      atomic_t         block_notifications;
      atomic_t         ignore_state_changes;
      mutable PBD::NonBlockingLock region_lock;
      RegionList       pending_removals;
      RegionList       pending_adds;
      RegionList       pending_bounds;
      bool             pending_modified;
      bool             pending_length;
      bool             save_on_thaw;
      string           last_save_reason;
      bool             in_set_state;
      bool            _hidden;
      bool            _splicing;
      bool            _nudging;
      uint32_t        _refcnt;
      EditMode        _edit_mode;
      bool             in_flush;
      bool             in_partition;
      bool            _frozen;
      uint32_t         subcnt;
      uint32_t        _read_data_count;
      id_t            _orig_diskstream_id;
      uint64_t         layer_op_counter;
      jack_nframes_t   freeze_length;

      void init (bool hide);

      bool holding_state () const { 
            return atomic_read (&block_notifications) != 0 ||
                  atomic_read (&ignore_state_changes) != 0;

      /* prevent the compiler from ever generating these */

      Playlist (const Playlist&);
      Playlist (Playlist&);

      void delay_notifications ();
      void release_notifications ();
      virtual void flush_notifications ();

      void notify_region_removed (Region *);
      void notify_region_added (Region *);
      void notify_length_changed ();
      void notify_layering_changed ();
      void notify_modified ();
      void notify_state_changed (Change);

      void mark_session_dirty();

      void region_changed_proxy (Change, Region*);
      virtual bool region_changed (Change, Region*);

      void region_bounds_changed (Change, Region *);
      void region_deleted (Region *);

      void sort_regions ();

      void possibly_splice ();
      void possibly_splice_unlocked();
      void core_splice ();
      void splice_locked ();
      void splice_unlocked ();

      virtual void finalize_split_region (Region *original, Region *left, Region *right) {}
      virtual void check_dependents (Region& region, bool norefresh) {}
      virtual void refresh_dependents (Region& region) {}
      virtual void remove_dependents (Region& region) {}

      virtual XMLNode& state (bool);

      /* override state_manager::save_state so we can check in_set_state() */

      void save_state (std::string why);
      void maybe_save_state (std::string why);

      void add_region_internal (Region *, jack_nframes_t position, bool delay_sort = false);

      int remove_region_internal (Region *, bool delay_sort = false);
      RegionList *find_regions_at (jack_nframes_t frame);
      void copy_regions (RegionList&) const;
      void partition_internal (jack_nframes_t start, jack_nframes_t end, bool cutting, RegionList& thawlist);

      jack_nframes_t _get_maximum_extent() const;

      Playlist* cut_copy (Playlist* (Playlist::*pmf)(jack_nframes_t, jack_nframes_t, bool), 
                      list<AudioRange>& ranges, bool result_is_hidden);
      Playlist *cut (jack_nframes_t start, jack_nframes_t cnt, bool result_is_hidden);
      Playlist *copy (jack_nframes_t start, jack_nframes_t cnt, bool result_is_hidden);

      int move_region_to_layer (layer_t, Region& r, int dir);
      void relayer ();

      static Playlist* copyPlaylist (const Playlist&, jack_nframes_t start, jack_nframes_t length,
                               string name, bool result_is_hidden);
      void unset_freeze_parent (Playlist*);
      void unset_freeze_child (Playlist*);

      void timestamp_layer_op (Region&);

} /* namespace ARDOUR */

#endif      /* __ardour_playlist_h__ */

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