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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
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_overlap_h__
#define __ardour_overlap_h__
#include <vector>
#include <algorithm>
#include <boost/shared_ptr.hpp>
#include "pbd/undo.h"
#include "pbd/statefuldestructible.h"
#include "ardour/ardour.h"
#include "ardour/audioregion.h"
#include "evoral/Curve.hpp"
namespace ARDOUR {
namespace Properties {
/* "active" is defined elsewhere but we use it with crossfade also */
extern PBD::PropertyDescriptor<bool> active;
extern PBD::PropertyDescriptor<bool> follow_overlap;
}
enum AnchorPoint {
StartOfIn,
EndOfIn,
EndOfOut
};
class Playlist;
class Crossfade : public ARDOUR::AudioRegion
{
public:
class NoCrossfadeHere: std::exception {
public:
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,
framecnt_t initial_length,
AnchorPoint);
/* 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 (boost::shared_ptr<Crossfade>, boost::shared_ptr<ARDOUR::AudioRegion>, boost::shared_ptr<ARDOUR::AudioRegion>);
/* the usual XML constructor */
Crossfade (const Playlist&, XMLNode const &);
virtual ~Crossfade();
static void make_property_quarks ();
XMLNode& get_state (void);
int set_state (const XMLNode&, int version);
boost::shared_ptr<ARDOUR::AudioRegion> in() const { return _in; }
boost::shared_ptr<ARDOUR::AudioRegion> out() const { return _out; }
framecnt_t read_at (Sample *buf, Sample *mixdown_buffer,
float *gain_buffer, framepos_t position, framecnt_t cnt,
uint32_t chan_n) const;
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);
}
framecnt_t overlap_length() const;
PBD::Signal1<void,boost::shared_ptr<Region> > Invalidated;
OverlapType coverage (framepos_t start, framepos_t end) const;
static void set_buffer_size (framecnt_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);
AutomationList& fade_in() { return _fade_in; }
AutomationList& fade_out() { return _fade_out; }
framecnt_t set_xfade_length (framecnt_t);
bool is_dependent() const { return true; }
bool depends_on (boost::shared_ptr<Region> other) const {
return other == _in || other == _out;
}
static framecnt_t short_xfade_length() { return _short_xfade_length; }
static void set_short_xfade_length (framecnt_t n);
/** emitted when the actual fade curves change, as opposed to one of the Stateful properties */
PBD::Signal0<void> FadesChanged;
private:
friend struct CrossfadeComparePtr;
friend class AudioPlaylist;
static framecnt_t _short_xfade_length;
boost::shared_ptr<ARDOUR::AudioRegion> _in;
boost::shared_ptr<ARDOUR::AudioRegion> _out;
PBD::Property<bool> _active;
PBD::Property<bool> _follow_overlap;
bool _in_update;
OverlapType overlap_type;
AnchorPoint _anchor_point;
bool _fixed;
int32_t layer_relation;
mutable AutomationList _fade_in;
mutable AutomationList _fade_out;
static Sample* crossfade_buffer_out;
static Sample* crossfade_buffer_in;
void initialize ();
void register_properties ();
int compute (boost::shared_ptr<ARDOUR::AudioRegion>, boost::shared_ptr<ARDOUR::AudioRegion>, CrossfadeModel);
bool update ();
bool operator== (const ARDOUR::Crossfade&);
protected:
framecnt_t read_raw_internal (Sample*, framepos_t, framecnt_t, int) const;
};
} // namespace ARDOUR
#endif /* __ardour_overlap_h__ */
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