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.
21 #ifndef __ardour_overlap_h__
22 #define __ardour_overlap_h__
26 #include <boost/shared_ptr.hpp>
28 #include <sigc++/signal.h>
31 #include <pbd/statefuldestructible.h>
33 #include <ardour/ardour.h>
34 #include <ardour/curve.h>
35 #include <ardour/audioregion.h>
36 #include <ardour/crossfade_compare.h>
43 class Crossfade : public PBD::StatefulDestructible
47 class NoCrossfadeHere: std::exception {
49 virtual const char *what() const throw() { return "no crossfade should be constructed here"; }
52 /* constructor for "fixed" xfades at each end of an internal overlap */
54 Crossfade (boost::shared_ptr<ARDOUR::AudioRegion> in, boost::shared_ptr<ARDOUR::AudioRegion> out,
56 nframes_t initial_length,
59 /* constructor for xfade between two regions that are overlapped in any way
60 except the "internal" case.
63 Crossfade (boost::shared_ptr<ARDOUR::AudioRegion> in, boost::shared_ptr<ARDOUR::AudioRegion> out, CrossfadeModel, bool active);
66 /* copy constructor to copy a crossfade with new regions. used (for example)
67 when a playlist copy is made */
68 Crossfade (const Crossfade &, boost::shared_ptr<ARDOUR::AudioRegion>, boost::shared_ptr<ARDOUR::AudioRegion>);
70 /* the usual XML constructor */
72 Crossfade (const ARDOUR::Playlist&, XMLNode&);
75 bool operator== (const ARDOUR::Crossfade&);
77 XMLNode& get_state (void);
78 int set_state (const XMLNode&);
80 boost::shared_ptr<ARDOUR::AudioRegion> in() const { return _in; }
81 boost::shared_ptr<ARDOUR::AudioRegion> out() const { return _out; }
83 nframes_t read_at (Sample *buf, Sample *mixdown_buffer,
84 float *gain_buffer, nframes_t position, nframes_t cnt,
86 nframes_t read_frames = 0,
87 nframes_t skip_frames = 0);
91 uint32_t upper_layer () const {
92 return std::max (_in->layer(), _out->layer());
95 uint32_t lower_layer () const {
96 return std::min (_in->layer(), _out->layer());
99 bool involves (boost::shared_ptr<ARDOUR::AudioRegion> region) const {
100 return _in == region || _out == region;
103 bool involves (boost::shared_ptr<ARDOUR::AudioRegion> a, boost::shared_ptr<ARDOUR::AudioRegion> b) const {
104 return (_in == a && _out == b) || (_in == b && _out == a);
107 nframes_t length() const { return _length; }
108 nframes_t overlap_length() const;
109 nframes_t position() const { return _position; }
113 sigc::signal<void,Crossfade*> Invalidated;
114 sigc::signal<void,Change> StateChanged;
116 bool covers (nframes_t frame) const {
117 return _position <= frame && frame < _position + _length;
120 OverlapType coverage (nframes_t start, nframes_t end) const;
122 static void set_buffer_size (nframes_t);
124 bool active () const { return _active; }
125 void set_active (bool yn);
127 bool following_overlap() const { return _follow_overlap; }
128 bool can_follow_overlap() const;
129 void set_follow_overlap (bool yn);
131 Curve& fade_in() { return _fade_in; }
132 Curve& fade_out() { return _fade_out; }
134 nframes_t set_length (nframes_t);
136 static nframes_t short_xfade_length() { return _short_xfade_length; }
137 static void set_short_xfade_length (nframes_t n);
139 static Change ActiveChanged;
140 static Change FollowOverlapChanged;
143 friend struct CrossfadeComparePtr;
144 friend class AudioPlaylist;
146 static nframes_t _short_xfade_length;
148 boost::shared_ptr<ARDOUR::AudioRegion> _in;
149 boost::shared_ptr<ARDOUR::AudioRegion> _out;
152 OverlapType overlap_type;
155 AnchorPoint _anchor_point;
156 bool _follow_overlap;
161 static Sample* crossfade_buffer_out;
162 static Sample* crossfade_buffer_in;
165 int compute (boost::shared_ptr<ARDOUR::AudioRegion>, boost::shared_ptr<ARDOUR::AudioRegion>, CrossfadeModel);
166 bool update (bool force);
168 void member_changed (ARDOUR::Change);
172 } // namespace ARDOUR
174 #endif /* __ardour_overlap_h__ */