3 Copyright (C) 1999-2002 Paul Davis
5 This program is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published by
7 the Free Software Foundation; either version 2 of the License, or
8 (at your option) any later version.
10 This program is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 GNU General Public License for more details.
15 You should have received a copy of the GNU General Public License
16 along with this program; if not, write to the Free Software
17 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
22 #include "libardour-config.h"
29 #include "ardour/timestamps.h"
31 #include "pbd/error.h"
32 #include "pbd/enumwriter.h"
33 #include "pbd/stacktrace.h"
35 #include "ardour/session.h"
36 #include "ardour/tempo.h"
41 using namespace ARDOUR;
47 Session::bbt_time (samplepos_t when, Timecode::BBT_Time& bbt)
49 bbt = _tempo_map->bbt_at_sample (when);
55 Session::timecode_frames_per_second() const
57 return Timecode::timecode_to_frames_per_second (config.get_timecode_format());
61 Session::timecode_drop_frames() const
63 return Timecode::timecode_has_drop_frames(config.get_timecode_format());
67 Session::sync_time_vars ()
69 _current_sample_rate = (samplecnt_t) round (_nominal_sample_rate * (1.0 + (config.get_video_pullup()/100.0)));
70 _samples_per_timecode_frame = (double) _current_sample_rate / (double) timecode_frames_per_second();
71 if (timecode_drop_frames()) {
72 _frames_per_hour = (int32_t)(107892 * _samples_per_timecode_frame);
74 _frames_per_hour = (int32_t)(3600 * rint(timecode_frames_per_second()) * _samples_per_timecode_frame);
76 _timecode_frames_per_hour = rint(timecode_frames_per_second() * 3600.0);
78 last_timecode_valid = false;
79 // timecode type bits are the middle two in the upper nibble
80 switch ((int) ceil (timecode_frames_per_second())) {
82 mtc_timecode_bits = 0;
86 mtc_timecode_bits = 0x20;
91 if (timecode_drop_frames()) {
92 mtc_timecode_bits = 0x40;
94 mtc_timecode_bits = 0x60;
98 ltc_tx_parse_offset();
102 Session::timecode_to_sample( Timecode::Time& timecode, samplepos_t& sample, bool use_offset, bool use_subframes ) const
104 timecode.rate = timecode_frames_per_second();
106 Timecode::timecode_to_sample(
107 timecode, sample, use_offset, use_subframes,
108 _current_sample_rate,
109 config.get_subframes_per_frame(),
110 config.get_timecode_offset_negative(), config.get_timecode_offset()
116 Session::sample_to_timecode (samplepos_t sample, Timecode::Time& timecode, bool use_offset, bool use_subframes ) const
118 Timecode::sample_to_timecode (
119 sample, timecode, use_offset, use_subframes,
121 timecode_frames_per_second(),
122 timecode_drop_frames(),
123 double(_current_sample_rate),
125 config.get_subframes_per_frame(),
126 config.get_timecode_offset_negative(), config.get_timecode_offset()
131 Session::timecode_time (samplepos_t when, Timecode::Time& timecode)
133 if (last_timecode_valid && when == last_timecode_when) {
134 timecode = last_timecode;
138 this->sample_to_timecode( when, timecode, true /* use_offset */, false /* use_subframes */ );
140 last_timecode_when = when;
141 last_timecode = timecode;
142 last_timecode_valid = true;
146 Session::timecode_time_subframes (samplepos_t when, Timecode::Time& timecode)
148 if (last_timecode_valid && when == last_timecode_when) {
149 timecode = last_timecode;
153 this->sample_to_timecode( when, timecode, true /* use_offset */, true /* use_subframes */ );
155 last_timecode_when = when;
156 last_timecode = timecode;
157 last_timecode_valid = true;
161 Session::timecode_duration (samplecnt_t when, Timecode::Time& timecode) const
163 this->sample_to_timecode( when, timecode, false /* use_offset */, true /* use_subframes */ );
167 Session::timecode_duration_string (char* buf, size_t len, samplepos_t when) const
169 Timecode::Time timecode;
171 timecode_duration (when, timecode);
172 snprintf (buf, len, "%02" PRIu32 ":%02" PRIu32 ":%02" PRIu32 ":%02" PRIu32, timecode.hours, timecode.minutes, timecode.seconds, timecode.frames);
176 Session::timecode_time (Timecode::Time &t)
179 timecode_time (_transport_sample, t);
183 Session::backend_sync_callback (TransportState state, samplepos_t pos)
185 bool slave = synced_to_engine();
186 // cerr << "Session::backend_sync_callback() _transport_sample: " << _transport_sample << " pos: " << pos << " audible_sample: " << audible_sample() << endl;
189 // cerr << "Session::backend_sync_callback() emitting Located()" << endl;
190 Located (); /* EMIT SIGNAL */
194 case TransportStopped:
195 if (slave && _transport_sample != pos && post_transport_work() == 0) {
196 request_locate (pos, false);
197 // cerr << "SYNC: stopped, locate to " << pos << " from " << _transport_sample << endl;
200 // cerr << "SYNC: stopped, nothing to do" << endl;
204 case TransportStarting:
205 // cerr << "SYNC: starting @ " << pos << " a@ " << _transport_sample << " our work = " << post_transport_work() << " pos matches ? " << (_transport_sample == pos) << endl;
207 return _transport_sample == pos && post_transport_work() == 0;
213 case TransportRolling:
214 // cerr << "SYNC: rolling slave = " << slave << endl;
221 error << string_compose (_("Unknown transport state %1 in sync callback"), state)
230 Session::convert_to_samples (AnyTime const & position)
234 switch (position.type) {
236 return _tempo_map->sample_at_bbt (position.bbt);
239 case AnyTime::Timecode:
240 /* XXX need to handle negative values */
241 secs = position.timecode.hours * 60 * 60;
242 secs += position.timecode.minutes * 60;
243 secs += position.timecode.seconds;
244 secs += position.timecode.frames / timecode_frames_per_second();
245 if (config.get_timecode_offset_negative()) {
246 return (samplecnt_t) floor (secs * sample_rate()) - config.get_timecode_offset();
248 return (samplecnt_t) floor (secs * sample_rate()) + config.get_timecode_offset();
252 case AnyTime::Seconds:
253 return (samplecnt_t) floor (position.seconds * sample_rate());
256 case AnyTime::Samples:
257 return position.samples;
261 return position.samples;
265 Session::any_duration_to_samples (samplepos_t position, AnyTime const & duration)
269 switch (duration.type) {
271 return (samplecnt_t) ( _tempo_map->samplepos_plus_bbt (position, duration.bbt) - position);
274 case AnyTime::Timecode:
275 /* XXX need to handle negative values */
276 secs = duration.timecode.hours * 60 * 60;
277 secs += duration.timecode.minutes * 60;
278 secs += duration.timecode.seconds;
279 secs += duration.timecode.frames / timecode_frames_per_second();
280 if (config.get_timecode_offset_negative()) {
281 return (samplecnt_t) floor (secs * sample_rate()) - config.get_timecode_offset();
283 return (samplecnt_t) floor (secs * sample_rate()) + config.get_timecode_offset();
287 case AnyTime::Seconds:
288 return (samplecnt_t) floor (duration.seconds * sample_rate());
291 case AnyTime::Samples:
292 return duration.samples;
296 return duration.samples;