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 "ardour/crossfade_compare.h"
34 #include "evoral/Curve.hpp"
41 class Crossfade : public ARDOUR::AudioRegion
45 class NoCrossfadeHere: std::exception {
47 virtual const char *what() const throw() { return "no crossfade should be constructed here"; }
50 /* constructor for "fixed" xfades at each end of an internal overlap */
52 Crossfade (boost::shared_ptr<ARDOUR::AudioRegion> in, boost::shared_ptr<ARDOUR::AudioRegion> out,
54 nframes_t initial_length,
57 /* constructor for xfade between two regions that are overlapped in any way
58 except the "internal" case.
61 Crossfade (boost::shared_ptr<ARDOUR::AudioRegion> in, boost::shared_ptr<ARDOUR::AudioRegion> out, CrossfadeModel, bool active);
64 /* copy constructor to copy a crossfade with new regions. used (for example)
65 when a playlist copy is made
67 Crossfade (boost::shared_ptr<Crossfade>, boost::shared_ptr<ARDOUR::AudioRegion>, boost::shared_ptr<ARDOUR::AudioRegion>);
69 /* the usual XML constructor */
71 Crossfade (const Playlist&, XMLNode&);
74 bool operator== (const ARDOUR::Crossfade&);
76 XMLNode& get_state (void);
77 int set_state (const XMLNode&, int version);
79 boost::shared_ptr<ARDOUR::AudioRegion> in() const { return _in; }
80 boost::shared_ptr<ARDOUR::AudioRegion> out() const { return _out; }
82 nframes_t read_at (Sample *buf, Sample *mixdown_buffer,
83 float *gain_buffer, sframes_t position, nframes_t cnt,
85 nframes_t read_frames = 0,
86 nframes_t skip_frames = 0) const;
90 uint32_t upper_layer () const {
91 return std::max (_in->layer(), _out->layer());
94 uint32_t lower_layer () const {
95 return std::min (_in->layer(), _out->layer());
98 bool involves (boost::shared_ptr<ARDOUR::AudioRegion> region) const {
99 return _in == region || _out == region;
102 bool involves (boost::shared_ptr<ARDOUR::AudioRegion> a, boost::shared_ptr<ARDOUR::AudioRegion> b) const {
103 return (_in == a && _out == b) || (_in == b && _out == a);
106 nframes_t overlap_length() const;
108 PBD::Signal1<void,boost::shared_ptr<Region> > Invalidated;
109 PBD::Signal1<void,Change> StateChanged;
111 bool covers (nframes_t frame) const {
112 return _position <= frame && frame < _position + _length;
115 OverlapType coverage (nframes_t start, nframes_t end) const;
117 static void set_buffer_size (nframes_t);
119 bool active () const { return _active; }
120 void set_active (bool yn);
122 bool following_overlap() const { return _follow_overlap; }
123 bool can_follow_overlap() const;
124 void set_follow_overlap (bool yn);
126 AutomationList& fade_in() { return _fade_in; }
127 AutomationList& fade_out() { return _fade_out; }
129 nframes_t set_xfade_length (nframes_t);
131 bool is_dependent() const { return true; }
132 bool depends_on (boost::shared_ptr<Region> other) const {
133 return other == _in || other == _out;
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;
153 AnchorPoint _anchor_point;
154 bool _follow_overlap;
156 int32_t layer_relation;
159 mutable AutomationList _fade_in;
160 mutable AutomationList _fade_out;
162 static Sample* crossfade_buffer_out;
163 static Sample* crossfade_buffer_in;
166 int compute (boost::shared_ptr<ARDOUR::AudioRegion>, boost::shared_ptr<ARDOUR::AudioRegion>, CrossfadeModel);
170 nframes_t read_raw_internal (Sample*, sframes_t, nframes_t, int) const;
174 } // namespace ARDOUR
176 #endif /* __ardour_overlap_h__ */