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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.


#ifndef __ardour_overlap_h__
#define __ardour_overlap_h__

#include <vector>
#include <algorithm>
#include <boost/shared_ptr.hpp>
#include <boost/enable_shared_from_this.hpp>

#include <sigc++/signal.h>

#include <pbd/undo.h>
#include <pbd/statefuldestructible.h> 

#include <ardour/ardour.h>
#include <ardour/curve.h>
#include <ardour/audioregion.h>
#include <ardour/crossfade_compare.h>

namespace ARDOUR {

class AudioRegion;
class Playlist;

class Crossfade : public PBD::StatefulDestructible, public boost::enable_shared_from_this<ARDOUR::Crossfade>

      class NoCrossfadeHere: std::exception {
            virtual const char *what() const throw() { return "no crossfade should be constructed here"; }
      /* constructor for "fixed" xfades at each end of an internal overlap */

      Crossfade (boost::shared_ptr<ARDOUR::AudioRegion> in, boost::shared_ptr<ARDOUR::AudioRegion> out,
               nframes_t position,
               nframes_t initial_length,

      /* constructor for xfade between two regions that are overlapped in any way
         except the "internal" case.
      Crossfade (boost::shared_ptr<ARDOUR::AudioRegion> in, boost::shared_ptr<ARDOUR::AudioRegion> out, CrossfadeModel, bool active);

      /* copy constructor to copy a crossfade with new regions. used (for example)
         when a playlist copy is made 
      Crossfade (const Crossfade &, boost::shared_ptr<ARDOUR::AudioRegion>, boost::shared_ptr<ARDOUR::AudioRegion>);
      /* the usual XML constructor */

      Crossfade (const Playlist&, XMLNode&);
      virtual ~Crossfade();

      bool operator== (const ARDOUR::Crossfade&);

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

      boost::shared_ptr<ARDOUR::AudioRegion> in() const { return _in; }
      boost::shared_ptr<ARDOUR::AudioRegion> out() const { return _out; }
      nframes_t read_at (Sample *buf, Sample *mixdown_buffer, 
                        float *gain_buffer, nframes_t position, nframes_t cnt, 
                        uint32_t chan_n,
                        nframes_t read_frames = 0,
                        nframes_t skip_frames = 0);
      bool refresh ();

      uint32_t upper_layer () const {
            return std::max (_in->layer(), _out->layer());

      uint32_t lower_layer () const {
            return std::min (_in->layer(), _out->layer());

      bool involves (boost::shared_ptr<ARDOUR::AudioRegion> region) const {
            return _in == region || _out == region;

      bool involves (boost::shared_ptr<ARDOUR::AudioRegion> a, boost::shared_ptr<ARDOUR::AudioRegion> b) const {
            return (_in == a && _out == b) || (_in == b && _out == a);

      nframes_t length() const { return _length; }
      nframes_t overlap_length() const;
      nframes_t position() const { return _position; }

      void invalidate();

      sigc::signal<void,boost::shared_ptr<Crossfade> > Invalidated;
      sigc::signal<void,Change>     StateChanged;

      bool covers (nframes_t frame) const {
            return _position <= frame && frame < _position + _length;

      OverlapType coverage (nframes_t start, nframes_t end) const;

      static void set_buffer_size (nframes_t);

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

      bool following_overlap() const { return _follow_overlap; }
      bool can_follow_overlap() const;
      void set_follow_overlap (bool yn);

      Curve& fade_in() { return _fade_in; } 
      Curve& fade_out() { return _fade_out; }

      nframes_t set_length (nframes_t);
      static nframes_t short_xfade_length() { return _short_xfade_length; }
      static void set_short_xfade_length (nframes_t n);

      static Change ActiveChanged;
      static Change FollowOverlapChanged;

      friend struct CrossfadeComparePtr;
      friend class AudioPlaylist;

      static nframes_t _short_xfade_length;

      boost::shared_ptr<ARDOUR::AudioRegion> _in;
      boost::shared_ptr<ARDOUR::AudioRegion> _out;
      bool                 _active;
      bool                 _in_update;
      OverlapType           overlap_type;
      nframes_t       _length;
      nframes_t       _position;
      AnchorPoint          _anchor_point;
      bool                 _follow_overlap;
      bool                 _fixed;
      int32_t               layer_relation;
      Curve _fade_in;
      Curve _fade_out;

      static Sample* crossfade_buffer_out;
      static Sample* crossfade_buffer_in;

      void initialize ();
      int  compute (boost::shared_ptr<ARDOUR::AudioRegion>, boost::shared_ptr<ARDOUR::AudioRegion>, CrossfadeModel);
      bool update ();

} // namespace ARDOUR

#endif /* __ardour_overlap_h__ */   

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