2 Copyright (C) 2000-2006 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.
18 $Id: midiregion.cc 746 2006-08-02 02:44:23Z drobilla $
28 #include <glibmm/thread.h>
30 #include "pbd/basename.h"
31 #include "pbd/xml++.h"
32 #include "pbd/enumwriter.h"
34 #include "ardour/midi_region.h"
35 #include "ardour/session.h"
36 #include "ardour/gain.h"
37 #include "ardour/dB.h"
38 #include "ardour/playlist.h"
39 #include "ardour/midi_source.h"
40 #include "ardour/region_factory.h"
41 #include "ardour/types.h"
42 #include "ardour/midi_ring_buffer.h"
48 using namespace ARDOUR;
51 /* Basic MidiRegion constructor (many channels) */
52 MidiRegion::MidiRegion (const SourceList& srcs)
55 midi_source(0)->Switched.connect_same_thread (*this, boost::bind (&MidiRegion::switch_source, this, _1));
56 assert(_name.val().find("/") == string::npos);
57 assert(_type == DataType::MIDI);
60 /** Create a new MidiRegion, that is part of an existing one */
61 MidiRegion::MidiRegion (boost::shared_ptr<const MidiRegion> other, frameoffset_t offset, bool offset_relative)
62 : Region (other, offset, offset_relative)
64 assert(_name.val().find("/") == string::npos);
65 midi_source(0)->Switched.connect_same_thread (*this, boost::bind (&MidiRegion::switch_source, this, _1));
68 MidiRegion::~MidiRegion ()
72 /** Create a new MidiRegion that has its own version of some/all of the Source used by another.
74 boost::shared_ptr<MidiRegion>
77 BeatsFramesConverter bfc (_session.tempo_map(), _position);
78 double bbegin = bfc.from (_position);
79 double bend = bfc.from (last_frame() + 1);
81 boost::shared_ptr<MidiSource> ms = midi_source(0)->clone (bbegin, bend);
85 plist.add (Properties::name, ms->name());
86 plist.add (Properties::whole_file, true);
87 plist.add (Properties::start, 0);
88 plist.add (Properties::length, _length);
89 plist.add (Properties::layer, 0);
91 return boost::dynamic_pointer_cast<MidiRegion> (RegionFactory::create (ms, plist, true));
95 MidiRegion::set_position_internal (framepos_t pos, bool allow_bbt_recompute)
97 BeatsFramesConverter old_converter(_session.tempo_map(), _position - _start);
98 double length_beats = old_converter.from(_length);
100 Region::set_position_internal(pos, allow_bbt_recompute);
102 BeatsFramesConverter new_converter(_session.tempo_map(), pos - _start);
104 set_length(new_converter.to(length_beats), 0);
108 MidiRegion::read_at (Evoral::EventSink<nframes_t>& out, framepos_t position, framecnt_t dur, uint32_t chan_n, NoteMode mode, MidiStateTracker* tracker) const
110 return _read_at (_sources, out, position, dur, chan_n, mode, tracker);
114 MidiRegion::master_read_at (MidiRingBuffer<nframes_t>& out, framepos_t position, framecnt_t dur, uint32_t chan_n, NoteMode mode) const
116 return _read_at (_master_sources, out, position, dur, chan_n, mode); /* no tracker */
120 MidiRegion::_read_at (const SourceList& /*srcs*/, Evoral::EventSink<nframes_t>& dst, framepos_t position, framecnt_t dur, uint32_t chan_n,
121 NoteMode mode, MidiStateTracker* tracker) const
123 frameoffset_t internal_offset = 0;
124 frameoffset_t src_offset = 0;
125 framecnt_t to_read = 0;
127 /* precondition: caller has verified that we cover the desired section */
132 return 0; /* read nothing */
135 if (position < _position) {
137 src_offset = _position - position;
140 internal_offset = position - _position;
144 if (internal_offset >= _length) {
145 return 0; /* read nothing */
148 if ((to_read = min (dur, _length - internal_offset)) == 0) {
149 return 0; /* read nothing */
152 _read_data_count = 0;
154 boost::shared_ptr<MidiSource> src = midi_source(chan_n);
155 src->set_note_mode(mode);
157 framepos_t output_buffer_position = 0;
158 framepos_t negative_output_buffer_position = 0;
159 if (_position >= _start) {
160 // handle resizing of beginnings of regions correctly
161 output_buffer_position = _position - _start;
163 // when _start is greater than _position, we have to subtract
164 // _start from the note times in the midi source
165 negative_output_buffer_position = _start;
168 /*cerr << "MR read @ " << position << " * " << to_read
169 << " _position = " << _position
170 << " _start = " << _start
171 << " offset = " << output_buffer_position
172 << " negoffset = " << negative_output_buffer_position
173 << " intoffset = " << internal_offset
177 dst, // destination buffer
178 _position - _start, // start position of the source in this read context
179 _start + internal_offset, // where to start reading in the source
180 to_read, // read duration in frames
181 output_buffer_position, // the offset in the output buffer
182 negative_output_buffer_position, // amount to substract from note times
185 return 0; /* "read nothing" */
188 _read_data_count += src->read_data_count();
194 MidiRegion::state (bool full)
196 return Region::state (full);
200 MidiRegion::set_state (const XMLNode& node, int version)
202 return Region::set_state (node, version);
206 MidiRegion::recompute_at_end ()
208 /* our length has changed
209 * so what? stuck notes are dealt with via a note state tracker
214 MidiRegion::recompute_at_start ()
216 /* as above, but the shift was from the front
217 * maybe bump currently active note's note-ons up so they sound here?
218 * that could be undesireable in certain situations though.. maybe
219 * remove the note entirely, including it's note off? something needs to
220 * be done to keep the played MIDI sane to avoid messing up voices of
221 * polyhonic things etc........
226 MidiRegion::separate_by_channel (ARDOUR::Session&, vector< boost::shared_ptr<Region> >&) const
233 MidiRegion::exportme (ARDOUR::Session&, ARDOUR::ExportSpecification&)
238 boost::shared_ptr<MidiSource>
239 MidiRegion::midi_source (uint32_t n) const
241 // Guaranteed to succeed (use a static cast?)
242 return boost::dynamic_pointer_cast<MidiSource>(source(n));
247 MidiRegion::switch_source(boost::shared_ptr<Source> src)
249 boost::shared_ptr<MidiSource> msrc = boost::dynamic_pointer_cast<MidiSource>(src);
253 // MIDI regions have only one source
255 _sources.push_back(msrc);
257 set_name(msrc->name());