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>
27 #include <boost/enable_shared_from_this.hpp>
29 #include <sigc++/signal.h>
32 #include <pbd/statefuldestructible.h>
34 #include <ardour/ardour.h>
35 #include <ardour/curve.h>
36 #include <ardour/audioregion.h>
37 #include <ardour/crossfade_compare.h>
44 class Crossfade : public PBD::StatefulDestructible, public boost::enable_shared_from_this<ARDOUR::Crossfade>
48 class NoCrossfadeHere: std::exception {
50 virtual const char *what() const throw() { return "no crossfade should be constructed here"; }
53 /* constructor for "fixed" xfades at each end of an internal overlap */
55 Crossfade (boost::shared_ptr<ARDOUR::AudioRegion> in, boost::shared_ptr<ARDOUR::AudioRegion> out,
57 nframes_t initial_length,
60 /* constructor for xfade between two regions that are overlapped in any way
61 except the "internal" case.
64 Crossfade (boost::shared_ptr<ARDOUR::AudioRegion> in, boost::shared_ptr<ARDOUR::AudioRegion> out, CrossfadeModel, bool active);
67 /* copy constructor to copy a crossfade with new regions. used (for example)
68 when a playlist copy is made
70 Crossfade (const Crossfade &, boost::shared_ptr<ARDOUR::AudioRegion>, boost::shared_ptr<ARDOUR::AudioRegion>);
72 /* the usual XML constructor */
74 Crossfade (const Playlist&, XMLNode&);
77 bool operator== (const ARDOUR::Crossfade&);
79 XMLNode& get_state (void);
80 int set_state (const XMLNode&);
82 boost::shared_ptr<ARDOUR::AudioRegion> in() const { return _in; }
83 boost::shared_ptr<ARDOUR::AudioRegion> out() const { return _out; }
85 nframes_t read_at (Sample *buf, Sample *mixdown_buffer,
86 float *gain_buffer, nframes_t position, nframes_t cnt,
88 nframes_t read_frames = 0,
89 nframes_t skip_frames = 0);
93 uint32_t upper_layer () const {
94 return std::max (_in->layer(), _out->layer());
97 uint32_t lower_layer () const {
98 return std::min (_in->layer(), _out->layer());
101 bool involves (boost::shared_ptr<ARDOUR::AudioRegion> region) const {
102 return _in == region || _out == region;
105 bool involves (boost::shared_ptr<ARDOUR::AudioRegion> a, boost::shared_ptr<ARDOUR::AudioRegion> b) const {
106 return (_in == a && _out == b) || (_in == b && _out == a);
109 nframes_t length() const { return _length; }
110 nframes_t overlap_length() const;
111 nframes_t position() const { return _position; }
115 sigc::signal<void,boost::shared_ptr<Crossfade> > Invalidated;
116 sigc::signal<void,Change> StateChanged;
118 bool covers (nframes_t frame) const {
119 return _position <= frame && frame < _position + _length;
122 OverlapType coverage (nframes_t start, nframes_t end) const;
124 static void set_buffer_size (nframes_t);
126 bool active () const { return _active; }
127 void set_active (bool yn);
129 bool following_overlap() const { return _follow_overlap; }
130 bool can_follow_overlap() const;
131 void set_follow_overlap (bool yn);
133 Curve& fade_in() { return _fade_in; }
134 Curve& fade_out() { return _fade_out; }
136 nframes_t set_length (nframes_t);
138 static nframes_t short_xfade_length() { return _short_xfade_length; }
139 static void set_short_xfade_length (nframes_t n);
141 static Change ActiveChanged;
142 static Change FollowOverlapChanged;
145 friend struct CrossfadeComparePtr;
146 friend class AudioPlaylist;
148 static nframes_t _short_xfade_length;
150 boost::shared_ptr<ARDOUR::AudioRegion> _in;
151 boost::shared_ptr<ARDOUR::AudioRegion> _out;
154 OverlapType overlap_type;
157 AnchorPoint _anchor_point;
158 bool _follow_overlap;
160 int32_t layer_relation;
164 static Sample* crossfade_buffer_out;
165 static Sample* crossfade_buffer_in;
168 int compute (boost::shared_ptr<ARDOUR::AudioRegion>, boost::shared_ptr<ARDOUR::AudioRegion>, CrossfadeModel);
171 void member_changed (ARDOUR::Change);
175 } // namespace ARDOUR
177 #endif /* __ardour_overlap_h__ */