summaryrefslogtreecommitdiff
path: root/libs/ardour/session_export.cc
blob: f7578a35086ffa7c0917adff6ed42193b1e1c81e (plain)
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
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
/*
 * Copyright (C) 2005-2017 Paul Davis <paul@linuxaudiosystems.com>
 * Copyright (C) 2006-2012 David Robillard <d@drobilla.net>
 * Copyright (C) 2008-2013 Sakari Bergen <sakari.bergen@beatwaves.net>
 * Copyright (C) 2010-2012 Carl Hetherington <carl@carlh.net>
 * Copyright (C) 2015-2018 Robin Gareus <robin@gareus.org>
 *
 * 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.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 */


#include "pbd/error.h"
#include <glibmm/threads.h>
#include <glibmm/timer.h>

#include <midi++/mmc.h>

#include "ardour/audioengine.h"
#include "ardour/butler.h"
#include "ardour/export_handler.h"
#include "ardour/export_status.h"
#include "ardour/process_thread.h"
#include "ardour/session.h"
#include "ardour/track.h"
#include "ardour/transport_fsm.h"

#include "pbd/i18n.h"

using namespace std;
using namespace ARDOUR;
using namespace PBD;

boost::shared_ptr<ExportHandler>
Session::get_export_handler ()
{
	if (!export_handler) {
		export_handler.reset (new ExportHandler (*this));
	}

	return export_handler;
}

boost::shared_ptr<ExportStatus>
Session::get_export_status ()
{
	if (!export_status) {
		export_status.reset (new ExportStatus ());
	}

	return export_status;
}


int
Session::pre_export ()
{
	get_export_status (); // Init export_status

	/* take everyone out of awrite to avoid disasters */

	{
		boost::shared_ptr<RouteList> r = routes.reader ();

		for (RouteList::iterator i = r->begin(); i != r->end(); ++i) {
			(*i)->protect_automation ();
		}
	}

	/* prepare transport */

	realtime_stop (true, true);

	if (get_record_enabled()) {
		disable_record (false);
	}

	unset_play_loop ();

	/* no slaving */

	post_export_sync = config.get_external_sync ();
	post_export_position = _transport_sample;

	config.set_external_sync (false);

	_exporting = true;
	export_status->set_running (true);
	export_status->Finished.connect_same_thread (*this, boost::bind (&Session::finalize_audio_export, this, _1));

	/* disable MMC output early */

	_pre_export_mmc_enabled = _mmc->send_enabled ();
	_mmc->enable_send (false);

	return 0;
}

/** Called for each range that is being exported */
int
Session::start_audio_export (samplepos_t position, bool realtime, bool region_export)
{
	assert (!engine().in_process_thread ());

	if (!_exporting) {
		pre_export ();
	} else if (_transport_speed != 0) {
		realtime_stop (true, true);
	}

	_region_export = region_export;

	if (region_export) {
		_export_preroll = 0;
	}
	else if (realtime) {
		_export_preroll = nominal_sample_rate ();
	} else {
		_export_preroll = Config->get_export_preroll() * nominal_sample_rate ();
	}

	if (_export_preroll == 0) {
		// must be > 0 so that transport is started in sync.
		_export_preroll = 1;
	}

	/* realtime_stop will have queued butler work (and TSFM),
	 * but the butler may not run immediately, so well have
	 * to wait for it to wake up and call
	 * non_realtime_stop ().
	 */
	int timeout = std::max (10, (int)(nominal_sample_rate () / get_block_size ()));
	do {
		Glib::usleep (engine().usecs_per_cycle ());
	} while (_transport_fsm->waiting_for_butler() && --timeout > 0);

	if (timeout == 0) {
		error << _("Cannot prepare transport for export") << endmsg;
		return -1;
	}

	/* We're about to call Track::seek, so the butler must have finished everything
	   up otherwise it could be doing do_refill in its thread while we are doing
	   it here.
	*/

	_butler->wait_until_finished ();

	/* get everyone to the right position */

	{
		boost::shared_ptr<RouteList> rl = routes.reader();

		for (RouteList::iterator i = rl->begin(); i != rl->end(); ++i) {
			boost::shared_ptr<Track> tr = boost::dynamic_pointer_cast<Track> (*i);
			if (tr && tr->seek (position, true)) {
				error << string_compose (_("%1: cannot seek to %2 for export"),
						  (*i)->name(), position)
				      << endmsg;
				return -1;
			}
		}
	}

	/* we just did the core part of a locate call above, but
	   for the sake of any GUI, put the _transport_sample in
	   the right place too.
	*/

	_transport_sample = position;

	if (!region_export) {
		_remaining_latency_preroll = worst_latency_preroll_buffer_size_ceil ();
	} else {
		_remaining_latency_preroll = 0;
	}

	/* get transport ready. note how this is calling butler functions
	   from a non-butler thread. we waited for the butler to stop
	   what it was doing earlier in Session::pre_export() and nothing
	   since then has re-awakened it.
	 */

	/* we are ready to go ... */

	if (!_engine.running()) {
		return -1;
	}

	assert (!_engine.freewheeling ());
	assert (!_engine.in_process_thread ());

	if (realtime) {
		Glib::Threads::Mutex::Lock lm (AudioEngine::instance()->process_lock ());
		_export_rolling = true;
		_realtime_export = true;
		export_status->stop = false;
		process_function = &Session::process_export_fw;
		/* this is required for ExportGraphBuilder::Intermediate::start_post_processing */
		_engine.Freewheel.connect_same_thread (export_freewheel_connection, boost::bind (&Session::process_export_fw, this, _1));
		return 0;
	} else {
		if (_realtime_export) {
			Glib::Threads::Mutex::Lock lm (AudioEngine::instance()->process_lock ());
			process_function = &Session::process_with_events;
		}
		_realtime_export = false;
		_export_rolling = true;
		export_status->stop = false;
		_engine.Freewheel.connect_same_thread (export_freewheel_connection, boost::bind (&Session::process_export_fw, this, _1));
		return _engine.freewheel (true);
	}
}

void
Session::process_export (pframes_t nframes)
{
	if (_export_rolling && export_status->stop) {
		stop_audio_export ();
	}

	/* for Region Raw or Fades, we can skip this
	 * RegionExportChannelFactory::update_buffers() does not care
	 * about anything done here
	 */
	if (!_region_export) {
		if (_export_rolling) {
			if (!_realtime_export)  {
				/* make sure we've caught up with disk i/o, since
				 * we're running faster than realtime c/o JACK.
				 */
				_butler->wait_until_finished ();
			}

			/* do the usual stuff */

			process_without_events (nframes);

		} else if (_realtime_export) {
			fail_roll (nframes); // somehow we need to silence _ALL_ output buffers
		}
	}

	try {
		/* handle export - XXX what about error handling? */

		if (ProcessExport (nframes).value_or (0) > 0) {
			/* last cycle completed */
			assert (_export_rolling);
			stop_audio_export ();
		}

	} catch (std::exception & e) {
		error << string_compose (_("Export ended unexpectedly: %1"), e.what()) << endmsg;
		export_status->abort (true);
	}
}

void
Session::process_export_fw (pframes_t nframes)
{
	if (!_export_rolling) {
		try {
			ProcessExport (0);
		} catch (std::exception & e) {
			/* pre-roll export must not throw */
			assert (0);
			export_status->abort (true);
		}
		return;
	}

	const bool need_buffers = _engine.freewheeling ();
	if (_export_preroll > 0) {

		if (need_buffers) {
			_engine.main_thread()->get_buffers ();
		}
		fail_roll (nframes);
		if (need_buffers) {
			_engine.main_thread()->drop_buffers ();
		}

		_export_preroll -= std::min ((samplepos_t)nframes, _export_preroll);

		if (_export_preroll > 0) {
			// clear out buffers (reverb tails etc).
			return;
		}

		set_transport_speed (1.0, false, false, false);
		butler_transport_work ();
		g_atomic_int_set (&_butler->should_do_transport_work, 0);
		butler_completed_transport_work ();
		/* Session::process_with_events () sets _remaining_latency_preroll = 0
		 * when being called with _transport_speed == 0.0.
		 *
		 * This can happen wit JACK, there is a process-callback before
		 * freewheeling becomes active, after Session::start_audio_export().
		 */
		if (!_region_export) {
			_remaining_latency_preroll = worst_latency_preroll_buffer_size_ceil ();
		}

		return;
	}

	if (_remaining_latency_preroll > 0) {
		samplepos_t remain = std::min ((samplepos_t)nframes, _remaining_latency_preroll);

		if (need_buffers) {
			_engine.main_thread()->get_buffers ();
		}

		assert (_count_in_samples == 0);
		while (remain > 0) {
			samplecnt_t ns = calc_preroll_subcycle (remain);

			bool session_needs_butler = false;
			if (process_routes (ns, session_needs_butler)) {
				fail_roll (ns);
			}

			try {
				ProcessExport (ns);
			} catch (std::exception & e) {
				/* pre-roll export must not throw */
				assert (0);
				export_status->abort (true);
			}

			_remaining_latency_preroll -= ns;
			remain -= ns;
			nframes -= ns;

			if (remain != 0) {
				_engine.split_cycle (ns);
			}
		}

		if (need_buffers) {
			_engine.main_thread()->drop_buffers ();
		}

		if (nframes == 0) {
			return;
		}
	}

	if (need_buffers) {
		_engine.main_thread()->get_buffers ();
	}
	process_export (nframes);
	if (need_buffers) {
		_engine.main_thread()->drop_buffers ();
	}

	return;
}

int
Session::stop_audio_export ()
{
	/* can't use stop_transport() here because we need
	   an synchronous halt and don't require all the declick
	   stuff that stop_transport() implements.
	*/

	realtime_stop (true, true);
	flush_all_inserts ();
	_export_rolling = false;
	_butler->schedule_transport_work ();

	return 0;
}

void
Session::finalize_audio_export (TransportRequestSource trs)
{
	/* This is called as a handler for the Finished signal, which is
	   emitted by a UI component once the ExportStatus object associated
	   with this export indicates that it has finished. It runs in the UI
	   thread that emits the signal.
	*/

	_exporting = false;

	if (_export_rolling) {
		stop_audio_export ();
	}

	/* Clean up */

	if (_realtime_export) {
		Glib::Threads::Mutex::Lock lm (AudioEngine::instance()->process_lock ());
		process_function = &Session::process_with_events;
	}
	_engine.freewheel (false);
	export_freewheel_connection.disconnect();

	_mmc->enable_send (_pre_export_mmc_enabled);

	/* maybe write CUE/TOC */

	export_handler.reset();
	export_status.reset();

	/* restart slaving */

	if (post_export_sync) {
		config.set_external_sync (true);
	} else {
		request_locate (post_export_position, MustStop, trs);
	}
}