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.
26 #include <ardour/timestamps.h>
28 #include <pbd/error.h>
30 #include <ardour/ardour.h>
31 #include <ardour/configuration.h>
32 #include <ardour/audioengine.h>
33 #include <ardour/session.h>
34 #include <ardour/tempo.h>
38 using namespace ARDOUR;
44 Session::bbt_time (jack_nframes_t when, BBT_Time& bbt)
46 _tempo_map->bbt_time (when, bbt);
52 Session::sync_time_vars ()
54 _current_frame_rate = _base_frame_rate * (1.0 + (video_pullup/100.0) );
55 _frames_per_hour = _current_frame_rate * 3600;
56 _frames_per_smpte_frame = (double) _current_frame_rate / (double) smpte_frames_per_second;
57 _smpte_frames_per_hour = (unsigned long) (smpte_frames_per_second * 3600.0);
61 Session::set_smpte_type (float fps, bool drop_frames)
63 smpte_frames_per_second = fps;
64 smpte_drop_frames = drop_frames;
66 last_smpte_valid = false;
67 // smpte type bits are the middle two in the upper nibble
68 switch ((int) ceil (fps)) {
71 SMPTE::Time::default_rate = SMPTE::MTC_24_FPS;
75 mtc_smpte_bits = 0x20;
76 SMPTE::Time::default_rate = SMPTE::MTC_25_FPS;
82 mtc_smpte_bits = 0x40;
83 SMPTE::Time::default_rate = SMPTE::MTC_30_FPS_DROP;
85 mtc_smpte_bits = 0x60;
86 SMPTE::Time::default_rate = SMPTE::MTC_30_FPS;
93 SMPTETypeChanged (); /* EMIT SIGNAL */
101 Session::set_video_pullup (float pull)
107 PullupChanged (); /* EMIT SIGNAL */
115 Session::set_smpte_offset (jack_nframes_t off)
118 last_smpte_valid = false;
120 SMPTEOffsetChanged (); /* EMIT SIGNAL */
124 Session::set_smpte_offset_negative (bool neg)
126 _smpte_offset_negative = neg;
127 last_smpte_valid = false;
129 SMPTEOffsetChanged (); /* EMIT SIGNAL */
133 Session::smpte_to_sample( SMPTE::Time& smpte, jack_nframes_t& sample, bool use_offset, bool use_subframes ) const
135 if (smpte_drop_frames) {
136 // The drop frame format was created to better approximate the 30000/1001 = 29.97002997002997....
137 // framerate of NTSC color TV. The used frame rate of drop frame is 29.97, which drifts by about
138 // 0.108 frame per hour, or about 1.3 frames per 12 hours. This is not perfect, but a lot better
139 // than using 30 non drop, which will drift with about 1.8 frame per minute.
140 // Using 29.97, drop frame real time can be accurate only every 10th minute (10 minutes of 29.97 fps
141 // is exactly 17982 frames). One minute is 1798.2 frames, but we count 30 frames per second
142 // (30 * 60 = 1800). This means that at the first minute boundary (at the end of 0:0:59:29) we
143 // are 1.8 frames too late relative to real time. By dropping 2 frames (jumping to 0:1:0:2) we are
144 // approx. 0.2 frames too early. This adds up with 0.2 too early for each minute until we are 1.8
145 // frames too early at 0:9:0:2 (9 * 0.2 = 1.8). The 10th minute brings us 1.8 frames later again
146 // (at end of 0:9:59:29), which sums up to 0 (we are back to zero at 0:10:0:0 :-).
150 // SMPTE value frames offset subframes offset seconds (rounded) 44100 sample (rounded)
151 // 0:00:00:00 0.0 0 0.000 0 (accurate)
152 // 0:00:59:29 1.8 144 60.027 2647177
153 // 0:01:00:02 -0.2 -16 60.060 2648648
154 // 0:01:59:29 1.6 128 120.020 5292883
155 // 0:02:00:02 -0.4 -32 120.053 5294354
156 // 0:02:59:29 1.4 112 180.013 7938588
157 // 0:03:00:02 -0.6 -48 180.047 7940060
158 // 0:03:59:29 1.2 96 240.007 10584294
159 // 0:04:00:02 -0.8 -64 240.040 10585766
160 // 0:04:59:29 1.0 80 300.000 13230000
161 // 0:05:00:02 -1.0 -80 300.033 13231471
162 // 0:05:59:29 0.8 64 359.993 15875706
163 // 0:06:00:02 -1.2 -96 360.027 15877177
164 // 0:06:59:29 0.6 48 419.987 18521411
165 // 0:07:00:02 -1.4 -112 420.020 18522883
166 // 0:07:59:29 0.4 32 478.980 21167117
167 // 0:08:00:02 -1.6 -128 480.013 21168589
168 // 0:08:59:29 0.2 16 539.973 23812823
169 // 0:09:00:02 -1.8 -144 540.007 23814294
170 // 0:09:59:29 0.0+ 0+ 599.967 26458529
171 // 0:10:00:00 0.0 0 600.000 26460000 (accurate)
173 // Per Sigmond <per@sigmond.no>
175 // Samples inside time dividable by 10 minutes (real time accurate)
176 jack_nframes_t base_samples = ((smpte.hours * 60 * 60) + ((smpte.minutes / 10) * 10 * 60)) * frame_rate();
177 // Samples inside time exceeding the nearest 10 minutes (always offset, see above)
178 long exceeding_df_minutes = smpte.minutes % 10;
179 long exceeding_df_seconds = (exceeding_df_minutes * 60) + smpte.seconds;
180 long exceeding_df_frames = (30 * exceeding_df_seconds) + smpte.frames - (2 * exceeding_df_minutes);
181 jack_nframes_t exceeding_samples = (jack_nframes_t) rint(exceeding_df_frames * _frames_per_smpte_frame);
182 sample = base_samples + exceeding_samples;
185 sample = (((smpte.hours * 60 * 60) + (smpte.minutes * 60) + smpte.seconds) * frame_rate()) + (jack_nframes_t)rint(smpte.frames * _frames_per_smpte_frame);
189 sample += (long) (((double)smpte.subframes * _frames_per_smpte_frame) / 80.0);
193 if (smpte_offset_negative()) {
194 if (sample >= smpte_offset()) {
195 sample -= smpte_offset();
197 /* Prevent song-time from becoming negative */
201 if (smpte.negative) {
202 if (sample <= smpte_offset()) {
203 sample = smpte_offset() - sample;
208 sample += smpte_offset();
216 Session::sample_to_smpte( jack_nframes_t sample, SMPTE::Time& smpte, bool use_offset, bool use_subframes ) const
218 jack_nframes_t offset_sample;
221 offset_sample = sample;
222 smpte.negative = false;
224 if (_smpte_offset_negative) {
225 offset_sample = sample + _smpte_offset;
226 smpte.negative = false;
228 if (sample < _smpte_offset) {
229 offset_sample = (_smpte_offset - sample);
230 smpte.negative = true;
232 offset_sample = sample - _smpte_offset;
233 smpte.negative = false;
238 double smpte_frames_left_exact;
239 double smpte_frames_fraction;
240 unsigned long smpte_frames_left;
242 // Extract whole hours. Do this to prevent rounding errors with
243 // high sample numbers in the calculations that follow.
244 smpte.hours = offset_sample / _frames_per_hour;
245 offset_sample = offset_sample % _frames_per_hour;
247 // Calculate exact number of (exceeding) smpte frames and fractional frames
248 smpte_frames_left_exact = (double) offset_sample / _frames_per_smpte_frame;
249 smpte_frames_fraction = smpte_frames_left_exact - floor( smpte_frames_left_exact );
250 smpte.subframes = (long) rint(smpte_frames_fraction * 80.0);
252 // XXX Not sure if this is necessary anymore...
253 if (smpte.subframes == 80) {
254 // This can happen with 24 fps (and 29.97 fps ?)
255 smpte_frames_left_exact = ceil( smpte_frames_left_exact );
259 // Extract hour-exceeding frames for minute, second and frame calculations
260 smpte_frames_left = ((long) floor( smpte_frames_left_exact ));
262 if (smpte_drop_frames) {
263 // See long explanation in smpte_to_sample()...
265 // Number of 10 minute chunks
266 smpte.minutes = (smpte_frames_left / 17982) * 10; // exactly 17982 frames in 10 minutes
267 // frames exceeding the nearest 10 minute barrier
268 long exceeding_df_frames = smpte_frames_left % 17982;
270 // Find minutes exceeding the nearest 10 minute barrier
271 if (exceeding_df_frames >= 1800) { // nothing to do if we are inside the first minute (0-1799)
272 exceeding_df_frames -= 1800; // take away first minute (different number of frames than the others)
273 long extra_minutes_minus_1 = exceeding_df_frames / 1798; // how many minutes after the first one
274 exceeding_df_frames -= extra_minutes_minus_1 * 1798; // take away the (extra) minutes just found
275 smpte.minutes += extra_minutes_minus_1 + 1; // update with exceeding minutes
278 // Adjust frame numbering for dropped frames (frame 0 and 1 skipped at start of every minute except every 10th)
279 if (smpte.minutes % 10) {
280 // Every minute except every 10th
281 if (exceeding_df_frames < 28) {
282 // First second, frames 0 and 1 are skipped
284 smpte.frames = exceeding_df_frames + 2;
286 // All other seconds, all 30 frames are counted
287 exceeding_df_frames -= 28;
288 smpte.seconds = (exceeding_df_frames / 30) + 1;
289 smpte.frames = exceeding_df_frames % 30;
292 // Every 10th minute, all 30 frames counted in all seconds
293 smpte.seconds = exceeding_df_frames / 30;
294 smpte.frames = exceeding_df_frames % 30;
298 smpte.minutes = smpte_frames_left / ((long) smpte_frames_per_second * 60);
299 smpte_frames_left = smpte_frames_left % ((long) smpte_frames_per_second * 60);
300 smpte.seconds = smpte_frames_left / (long) smpte_frames_per_second;
301 smpte.frames = smpte_frames_left % (long) smpte_frames_per_second;
304 if (!use_subframes) {
310 Session::smpte_time (jack_nframes_t when, SMPTE::Time& smpte)
312 if (last_smpte_valid && when == last_smpte_when) {
317 sample_to_smpte( when, smpte, true /* use_offset */, false /* use_subframes */ );
319 last_smpte_when = when;
321 last_smpte_valid = true;
325 Session::smpte_time_subframes (jack_nframes_t when, SMPTE::Time& smpte)
327 if (last_smpte_valid && when == last_smpte_when) {
332 sample_to_smpte( when, smpte, true /* use_offset */, true /* use_subframes */ );
334 last_smpte_when = when;
336 last_smpte_valid = true;
340 Session::smpte_duration (jack_nframes_t when, SMPTE::Time& smpte) const
342 sample_to_smpte( when, smpte, false /* use_offset */, true /* use_subframes */ );
346 Session::smpte_duration_string (char* buf, jack_nframes_t when) const
350 smpte_duration (when, smpte);
351 snprintf (buf, sizeof (buf), "%02" PRIu32 ":%02" PRIu32 ":%02" PRIu32 ":%02" PRIu32, smpte.hours, smpte.minutes, smpte.seconds, smpte.frames);
355 Session::smpte_time (SMPTE::Time &t)
358 smpte_time (_transport_frame, t);
362 Session::jack_sync_callback (jack_transport_state_t state,
363 jack_position_t* pos)
365 bool slave = synced_to_jack();
368 case JackTransportStopped:
369 if (slave && _transport_frame != pos->frame && post_transport_work == 0) {
370 request_locate (pos->frame, false);
371 // cerr << "SYNC: stopped, locate to " << pos->frame << " from " << _transport_frame << endl;
377 case JackTransportStarting:
378 // cerr << "SYNC: starting @ " << pos->frame << " a@ " << _transport_frame << " our work = " << post_transport_work << " pos matches ? " << (_transport_frame == pos->frame) << endl;
380 return _transport_frame == pos->frame && post_transport_work == 0;
386 case JackTransportRolling:
387 // cerr << "SYNC: rolling slave = " << slave << endl;
394 error << string_compose (_("Unknown JACK transport state %1 in sync callback"), state)
402 Session::jack_timebase_callback (jack_transport_state_t state,
403 jack_nframes_t nframes,
404 jack_position_t* pos,
411 pos->frame = _transport_frame;
412 pos->valid = JackPositionTimecode;
418 TempoMap::Metric metric (_tempo_map->metric_at (_transport_frame));
419 _tempo_map->bbt_time_with_metric (_transport_frame, bbt, metric);
422 pos->beat = bbt.beats;
423 pos->tick = bbt.ticks;
425 // XXX still need to set bar_start_tick
427 pos->beats_per_bar = metric.meter().beats_per_bar();
428 pos->beat_type = metric.meter().note_divisor();
429 pos->ticks_per_beat = Meter::ticks_per_beat;
430 pos->beats_per_minute = metric.tempo().beats_per_minute();
432 pos->valid = jack_position_bits_t (pos->valid | JackPositionBBT);
435 //poke audio video ratio so Ardour can track Video Sync
436 pos->audio_frames_per_video_frame = frame_rate() / smpte_frames_per_second;
437 pos->valid = jack_position_bits_t (pos->valid | JackAudioVideoRatio);
442 t.smpte_offset = _smpte_offset;
443 t.smpte_frame_rate = smpte_frames_per_second;
445 if (_transport_speed) {
449 Location* location = _locations.auto_loop_location();
453 t.transport_state = JackTransportLooping;
454 t.loop_start = location->start();
455 t.loop_end = location->end();
456 t.valid = jack_transport_bits_t (t.valid | JackTransportLoop);
462 t.transport_state = JackTransportRolling;
470 t.transport_state = JackTransportRolling;
480 Session::convert_to_frames_at (jack_nframes_t position, AnyTime& any)
486 return _tempo_map->frame_time ( any.bbt);
490 /* XXX need to handle negative values */
491 secs = any.smpte.hours * 60 * 60;
492 secs += any.smpte.minutes * 60;
493 secs += any.smpte.seconds;
494 secs += any.smpte.frames / smpte_frames_per_second;
495 if (_smpte_offset_negative)
497 return (jack_nframes_t) floor (secs * frame_rate()) - _smpte_offset;
501 return (jack_nframes_t) floor (secs * frame_rate()) + _smpte_offset;
505 case AnyTime::Seconds:
506 return (jack_nframes_t) floor (any.seconds * frame_rate());
509 case AnyTime::Frames: