2 Copyright (C) 2000 Paul Davis
4 This program is free software; you can redistribute it and/or modify
5 it under the terms of the GNU General Public License as published by
6 the Free Software Foundation; either version 2 of the License, or
7 (at your option) any later version.
9 This program is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 GNU General Public License for more details.
14 You should have received a copy of the GNU General Public License
15 along with this program; if not, write to the Free Software
16 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
20 #ifndef __ardour_overlap_h__
21 #define __ardour_overlap_h__
25 #include <boost/shared_ptr.hpp>
29 #include "pbd/statefuldestructible.h"
31 #include "ardour/ardour.h"
32 #include "ardour/audioregion.h"
33 #include "evoral/Curve.hpp"
36 namespace Properties {
37 /* "active" is defined elsewhere but we use it with crossfade also */
38 extern PBD::PropertyDescriptor<bool> active;
39 extern PBD::PropertyDescriptor<bool> follow_overlap;
50 class Crossfade : public ARDOUR::AudioRegion
54 class NoCrossfadeHere: std::exception {
56 virtual const char *what() const throw() { return "no crossfade should be constructed here"; }
59 /* constructor for "fixed" xfades at each end of an internal overlap */
61 Crossfade (boost::shared_ptr<ARDOUR::AudioRegion> in, boost::shared_ptr<ARDOUR::AudioRegion> out,
63 framecnt_t initial_length,
66 /* constructor for xfade between two regions that are overlapped in any way
67 except the "internal" case.
70 Crossfade (boost::shared_ptr<ARDOUR::AudioRegion> in, boost::shared_ptr<ARDOUR::AudioRegion> out, CrossfadeModel, bool active);
73 /* copy constructor to copy a crossfade with new regions. used (for example)
74 when a playlist copy is made
76 Crossfade (boost::shared_ptr<Crossfade>, boost::shared_ptr<ARDOUR::AudioRegion>, boost::shared_ptr<ARDOUR::AudioRegion>);
78 /* the usual XML constructor */
80 Crossfade (const Playlist&, XMLNode const &);
83 static void make_property_quarks ();
85 XMLNode& get_state (void);
86 int set_state (const XMLNode&, int version);
88 boost::shared_ptr<ARDOUR::AudioRegion> in() const { return _in; }
89 boost::shared_ptr<ARDOUR::AudioRegion> out() const { return _out; }
91 framecnt_t read_at (Sample *buf, Sample *mixdown_buffer,
92 float *gain_buffer, framepos_t position, framecnt_t cnt,
94 framecnt_t read_frames = 0,
95 framecnt_t skip_frames = 0) const;
99 uint32_t upper_layer () const {
100 return std::max (_in->layer(), _out->layer());
103 uint32_t lower_layer () const {
104 return std::min (_in->layer(), _out->layer());
107 bool involves (boost::shared_ptr<ARDOUR::AudioRegion> region) const {
108 return _in == region || _out == region;
111 bool involves (boost::shared_ptr<ARDOUR::AudioRegion> a, boost::shared_ptr<ARDOUR::AudioRegion> b) const {
112 return (_in == a && _out == b) || (_in == b && _out == a);
115 framecnt_t overlap_length() const;
117 PBD::Signal1<void,boost::shared_ptr<Region> > Invalidated;
119 bool covers (framepos_t frame) const {
120 return _position <= frame && frame < _position + _length;
123 OverlapType coverage (framepos_t start, framepos_t end) const;
125 static void set_buffer_size (framecnt_t);
127 bool active () const { return _active; }
128 void set_active (bool yn);
130 bool following_overlap() const { return _follow_overlap; }
131 bool can_follow_overlap() const;
132 void set_follow_overlap (bool yn);
134 AutomationList& fade_in() { return _fade_in; }
135 AutomationList& fade_out() { return _fade_out; }
137 framecnt_t set_xfade_length (framecnt_t);
139 bool is_dependent() const { return true; }
140 bool depends_on (boost::shared_ptr<Region> other) const {
141 return other == _in || other == _out;
144 static framecnt_t short_xfade_length() { return _short_xfade_length; }
145 static void set_short_xfade_length (framecnt_t n);
147 /** emitted when the actual fade curves change, as opposed to one of the Stateful properties */
148 PBD::Signal0<void> FadesChanged;
151 friend struct CrossfadeComparePtr;
152 friend class AudioPlaylist;
154 static framecnt_t _short_xfade_length;
156 boost::shared_ptr<ARDOUR::AudioRegion> _in;
157 boost::shared_ptr<ARDOUR::AudioRegion> _out;
158 PBD::Property<bool> _active;
159 PBD::Property<bool> _follow_overlap;
161 OverlapType overlap_type;
162 AnchorPoint _anchor_point;
164 int32_t layer_relation;
167 mutable AutomationList _fade_in;
168 mutable AutomationList _fade_out;
170 static Sample* crossfade_buffer_out;
171 static Sample* crossfade_buffer_in;
174 int compute (boost::shared_ptr<ARDOUR::AudioRegion>, boost::shared_ptr<ARDOUR::AudioRegion>, CrossfadeModel);
177 bool operator== (const ARDOUR::Crossfade&);
180 framecnt_t read_raw_internal (Sample*, framepos_t, framecnt_t, int) const;
184 } // namespace ARDOUR
186 #endif /* __ardour_overlap_h__ */