1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
|
/*
Copyright (C) 2008 Hans Baier
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include "pbd/compose.h"
#include "pbd/stacktrace.h"
#include "midi++/port.h"
#include "midi++/manager.h"
#include "evoral/midi_events.h"
#include "ardour/ticker.h"
#include "ardour/session.h"
#include "ardour/tempo.h"
#include "ardour/debug.h"
using namespace ARDOUR;
MidiClockTicker::MidiClockTicker ()
: _midi_port (0)
, _ppqn (24)
, _last_tick (0.0)
{
}
void MidiClockTicker::set_session (Session* s)
{
SessionHandlePtr::set_session (s);
if (_session) {
_session->TransportStateChange.connect_same_thread (_session_connections, boost::bind (&MidiClockTicker::transport_state_changed, this));
_session->PositionChanged.connect_same_thread (_session_connections, boost::bind (&MidiClockTicker::position_changed, this, _1));
_session->TransportLooped.connect_same_thread (_session_connections, boost::bind (&MidiClockTicker::transport_looped, this));
update_midi_clock_port();
}
}
void
MidiClockTicker::session_going_away ()
{
SessionHandlePtr::session_going_away();
_midi_port = 0;
}
void MidiClockTicker::update_midi_clock_port()
{
_midi_port = MIDI::Manager::instance()->midi_clock_output_port();
}
void MidiClockTicker::transport_state_changed()
{
if (_session->exporting()) {
/* no midi clock during export, for now */
return;
}
float speed = _session->transport_speed();
framepos_t position = _session->transport_frame();
DEBUG_TRACE (PBD::DEBUG::MidiClock,
string_compose ("Transport state change @ %4, speed: %1 position: %2 play loop: %3\n", speed, position, _session->get_play_loop(), position)
);
if (speed == 1.0f) {
_last_tick = position;
if (!Config->get_send_midi_clock())
return;
if (_session->get_play_loop()) {
assert(_session->locations()->auto_loop_location());
if (position == _session->locations()->auto_loop_location()->start()) {
send_start_event(0);
} else {
send_continue_event(0);
}
} else if (position == 0) {
send_start_event(0);
} else {
send_continue_event(0);
}
send_midi_clock_event(0);
} else if (speed == 0.0f) {
if (!Config->get_send_midi_clock())
return;
send_stop_event(0);
}
tick (position);
}
void MidiClockTicker::position_changed (framepos_t position)
{
DEBUG_TRACE (PBD::DEBUG::MidiClock, string_compose ("Position change: %1\n", position));
_last_tick = position;
}
void MidiClockTicker::transport_looped()
{
Location* loop_location = _session->locations()->auto_loop_location();
assert(loop_location);
DEBUG_TRACE (PBD::DEBUG::MidiClock,
string_compose ("Transport looped, position: %1, loop start: %2, loop end: %3, play loop: %4\n",
_session->transport_frame(), loop_location->start(), loop_location->end(), _session->get_play_loop())
);
// adjust _last_tick, so that the next MIDI clock message is sent
// in due time (and the tick interval is still constant)
framecnt_t elapsed_since_last_tick = loop_location->end() - _last_tick;
_last_tick = loop_location->start() - elapsed_since_last_tick;
}
void MidiClockTicker::tick (const framepos_t& transport_frames)
{
if (!Config->get_send_midi_clock() || _session == 0 || _session->transport_speed() != 1.0f || _midi_port == 0)
return;
while (true) {
double next_tick = _last_tick + one_ppqn_in_frames(transport_frames);
frameoffset_t next_tick_offset = llrint (next_tick) - transport_frames;
DEBUG_TRACE (PBD::DEBUG::MidiClock,
string_compose ("Transport: %1, last tick time: %2, next tick time: %3, offset: %4, cycle length: %5\n",
transport_frames, _last_tick, next_tick, next_tick_offset, _midi_port->nframes_this_cycle()
)
);
if (next_tick_offset >= _midi_port->nframes_this_cycle()) {
break;
}
send_midi_clock_event (next_tick_offset);
_last_tick = next_tick;
}
}
double MidiClockTicker::one_ppqn_in_frames (framepos_t transport_position)
{
const Tempo& current_tempo = _session->tempo_map().tempo_at(transport_position);
double frames_per_beat = current_tempo.frames_per_beat(_session->nominal_frame_rate());
double quarter_notes_per_beat = 4.0 / current_tempo.note_type();
double frames_per_quarter_note = frames_per_beat / quarter_notes_per_beat;
return frames_per_quarter_note / double (_ppqn);
}
void MidiClockTicker::send_midi_clock_event (pframes_t offset)
{
if (!_midi_port) {
return;
}
DEBUG_TRACE (PBD::DEBUG::MidiClock, string_compose ("Tick with offset %1\n", offset));
static uint8_t _midi_clock_tick[1] = { MIDI_CMD_COMMON_CLOCK };
_midi_port->write (_midi_clock_tick, 1, offset);
}
void MidiClockTicker::send_start_event (pframes_t offset)
{
if (!_midi_port) {
return;
}
static uint8_t _midi_clock_tick[1] = { MIDI_CMD_COMMON_START };
_midi_port->write (_midi_clock_tick, 1, offset);
}
void MidiClockTicker::send_continue_event (pframes_t offset)
{
if (!_midi_port) {
return;
}
static uint8_t _midi_clock_tick[1] = { MIDI_CMD_COMMON_CONTINUE };
_midi_port->write (_midi_clock_tick, 1, offset);
}
void MidiClockTicker::send_stop_event (pframes_t offset)
{
if (!_midi_port) {
return;
}
static uint8_t _midi_clock_tick[1] = { MIDI_CMD_COMMON_STOP };
_midi_port->write (_midi_clock_tick, 1, offset);
}
|
