libs/ardour/diskstream.cc

   1 /*
   2     Copyright (C) 2000-2006 Paul Davis
   3
   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.
   8
   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.
  13
  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.
  17
  18 */
  19
  20 #include <cassert>
  21 #include <cstdio>
  22 #include <unistd.h>
  23 #include <cmath>
  24 #include <cerrno>
  25 #include <string>
  26 #include <climits>
  27 #include <fcntl.h>
  28 #include <cstdlib>
  29 #include <ctime>
  30 #include <sys/stat.h>
  31
  32 #include <glibmm/threads.h>
  33
  34 #include "pbd/error.h"
  35 #include "pbd/basename.h"
  36 #include "pbd/memento_command.h"
  37 #include "pbd/xml++.h"
  38 #include "pbd/stacktrace.h"
  39
  40 #include "ardour/debug.h"
  41 #include "ardour/diskstream.h"
  42 #include "ardour/io.h"
  43 #include "ardour/pannable.h"
  44 #include "ardour/profile.h"
  45 #include "ardour/playlist.h"
  46 #include "ardour/session.h"
  47 #include "ardour/track.h"
  48
  49 #include "pbd/i18n.h"
  50 #include <locale.h>
  51
  52 using namespace std;
  53 using namespace ARDOUR;
  54 using namespace PBD;
  55
  56 ARDOUR::framecnt_t Diskstream::disk_read_chunk_frames = default_disk_read_chunk_frames ();
  57 ARDOUR::framecnt_t Diskstream::disk_write_chunk_frames = default_disk_write_chunk_frames ();
  58
  59 PBD::Signal0<void>                Diskstream::DiskOverrun;
  60 PBD::Signal0<void>                Diskstream::DiskUnderrun;
  61
  62 Diskstream::Diskstream (Session &sess, const string &name, Flag flag)
  63         : SessionObject(sess, name)
  64         , i_am_the_modifier (0)
  65         , _track (0)
  66         , _record_enabled (0)
  67             , _record_safe (0)
  68         , _visible_speed (1.0f)
  69         , _actual_speed (1.0f)
  70         , _buffer_reallocation_required (false)
  71         , _seek_required (false)
  72         , capture_start_frame (0)
  73         , capture_captured (0)
  74         , was_recording (false)
  75         , adjust_capture_position (0)
  76         , _capture_offset (0)
  77         , _roll_delay (0)
  78         , first_recordable_frame (max_framepos)
  79         , last_recordable_frame (max_framepos)
  80         , last_possibly_recording (0)
  81         , _alignment_style (ExistingMaterial)
  82         , _alignment_choice (Automatic)
  83         , _slaved (false)
  84         , loop_location (0)
  85         , overwrite_frame (0)
  86         , overwrite_offset (0)
  87         , _pending_overwrite (false)
  88         , overwrite_queued (false)
  89         , wrap_buffer_size (0)
  90         , speed_buffer_size (0)
  91         , _speed (1.0)
  92         , _target_speed (_speed)
  93         , file_frame (0)
  94         , playback_sample (0)
  95         , in_set_state (false)
  96         , _flags (flag)
  97         , deprecated_io_node (0)
  98 {
  99 }
 100
 101 Diskstream::Diskstream (Session& sess, const XMLNode& /*node*/)
 102         : SessionObject(sess, "unnamed diskstream")
 103         , i_am_the_modifier (0)
 104         , _track (0)
 105         , _record_enabled (0)
 106             , _record_safe (0)
 107         , _visible_speed (1.0f)
 108         , _actual_speed (1.0f)
 109         , _buffer_reallocation_required (false)
 110         , _seek_required (false)
 111         , capture_start_frame (0)
 112         , capture_captured (0)
 113         , was_recording (false)
 114         , adjust_capture_position (0)
 115         , _capture_offset (0)
 116         , _roll_delay (0)
 117         , first_recordable_frame (max_framepos)
 118         , last_recordable_frame (max_framepos)
 119         , last_possibly_recording (0)
 120         , _alignment_style (ExistingMaterial)
 121         , _alignment_choice (Automatic)
 122         , _slaved (false)
 123         , loop_location (0)
 124         , overwrite_frame (0)
 125         , overwrite_offset (0)
 126         , _pending_overwrite (false)
 127         , overwrite_queued (false)
 128         , wrap_buffer_size (0)
 129         , speed_buffer_size (0)
 130         , _speed (1.0)
 131         , _target_speed (_speed)
 132         , file_frame (0)
 133         , playback_sample (0)
 134         , in_set_state (false)
 135         , _flags (Recordable)
 136         , deprecated_io_node (0)
 137 {
 138 }
 139
 140 Diskstream::~Diskstream ()
 141 {
 142         DEBUG_TRACE (DEBUG::Destruction, string_compose ("Diskstream %1 deleted\n", _name));
 143
 144         if (_playlist) {
 145                 _playlist->release ();
 146         }
 147
 148         delete deprecated_io_node;
 149 }
 150
 151 void
 152 Diskstream::set_track (Track* t)
 153 {
 154         _track = t;
 155         _io = _track->input();
 156
 157         ic_connection.disconnect();
 158         _io->changed.connect_same_thread (ic_connection, boost::bind (&Diskstream::handle_input_change, this, _1, _2));
 159
 160         if (_io->n_ports() != ChanCount::ZERO) {
 161                 input_change_pending.type = IOChange::Type (IOChange::ConfigurationChanged|IOChange::ConnectionsChanged);
 162                 non_realtime_input_change ();
 163         }
 164
 165         _track->Destroyed.connect_same_thread (*this, boost::bind (&Diskstream::route_going_away, this));
 166 }
 167
 168 void
 169 Diskstream::handle_input_change (IOChange change, void * /*src*/)
 170 {
 171         Glib::Threads::Mutex::Lock lm (state_lock);
 172
 173         if (change.type & (IOChange::ConfigurationChanged|IOChange::ConnectionsChanged)) {
 174
 175                 /* rather than handle this here on a DS-by-DS basis we defer to the
 176                    session transport/butler thread, and let it tackle
 177                    as many diskstreams as need it in one shot. this avoids many repeated
 178                    takings of the audioengine process lock.
 179                 */
 180
 181                 if (!(input_change_pending.type & change.type)) {
 182                         input_change_pending.type = IOChange::Type (input_change_pending.type | change.type);
 183                         _session.request_input_change_handling ();
 184                 }
 185         }
 186 }
 187
 188 void
 189 Diskstream::non_realtime_set_speed ()
 190 {
 191         if (_buffer_reallocation_required)
 192         {
 193                 Glib::Threads::Mutex::Lock lm (state_lock);
 194                 allocate_temporary_buffers ();
 195
 196                 _buffer_reallocation_required = false;
 197         }
 198
 199         if (_seek_required) {
 200                 if (speed() != 1.0f || speed() != -1.0f) {
 201                         seek ((framepos_t) (_session.transport_frame() * (double) speed()), true);
 202                 }
 203                 else {
 204                         seek (_session.transport_frame(), true);
 205                 }
 206
 207                 _seek_required = false;
 208         }
 209 }
 210
 211 bool
 212 Diskstream::realtime_set_speed (double sp, bool global)
 213 {
 214         bool changed = false;
 215         double new_speed = sp * _session.transport_speed();
 216
 217         if (_visible_speed != sp) {
 218                 _visible_speed = sp;
 219                 changed = true;
 220         }
 221
 222         if (new_speed != _actual_speed) {
 223
 224                 framecnt_t required_wrap_size = (framecnt_t) ceil (_session.get_block_size() *
 225                                                                   fabs (new_speed)) + 2;
 226
 227                 if (required_wrap_size > wrap_buffer_size) {
 228                         _buffer_reallocation_required = true;
 229                 }
 230
 231                 _actual_speed = new_speed;
 232                 _target_speed = fabs(_actual_speed);
 233         }
 234
 235         if (changed) {
 236                 if (!global) {
 237                         _seek_required = true;
 238                 }
 239                 SpeedChanged (); /* EMIT SIGNAL */
 240         }
 241
 242         return _buffer_reallocation_required || _seek_required;
 243 }
 244
 245 void
 246 Diskstream::set_capture_offset ()
 247 {
 248         if (_io == 0) {
 249                 /* can't capture, so forget it */
 250                 return;
 251         }
 252
 253         switch (_alignment_style) {
 254         case ExistingMaterial:
 255                 _capture_offset = _io->latency();
 256                 break;
 257
 258         case CaptureTime:
 259         default:
 260                 _capture_offset = 0;
 261                 break;
 262         }
 263
 264         DEBUG_TRACE (DEBUG::CaptureAlignment, string_compose ("%1: using IO latency, capture offset set to %2 with style = %3\n", name(), _capture_offset, enum_2_string (_alignment_style)));
 265 }
 266
 267
 268 void
 269 Diskstream::set_align_style (AlignStyle a, bool force)
 270 {
 271         if (record_enabled() && _session.actively_recording()) {
 272                 return;
 273         }
 274
 275         if ((a != _alignment_style) || force) {
 276                 _alignment_style = a;
 277                 set_capture_offset ();
 278                 AlignmentStyleChanged ();
 279         }
 280 }
 281
 282 void
 283 Diskstream::set_align_choice (AlignChoice a, bool force)
 284 {
 285         if (record_enabled() && _session.actively_recording()) {
 286                 return;
 287         }
 288
 289         if ((a != _alignment_choice) || force) {
 290                 _alignment_choice = a;
 291
 292                 switch (_alignment_choice) {
 293                         case Automatic:
 294                                 set_align_style_from_io ();
 295                                 break;
 296                         case UseExistingMaterial:
 297                                 set_align_style (ExistingMaterial);
 298                                 break;
 299                         case UseCaptureTime:
 300                                 set_align_style (CaptureTime);
 301                                 break;
 302                 }
 303         }
 304 }
 305
 306 int
 307 Diskstream::set_loop (Location *location)
 308 {
 309         if (location) {
 310                 if (location->start() >= location->end()) {
 311                         error << string_compose(_("Location \"%1\" not valid for track loop (start >= end)"), location->name()) << endl;
 312                         return -1;
 313                 }
 314         }
 315
 316         loop_location = location;
 317
 318         LoopSet (location); /* EMIT SIGNAL */
 319         return 0;
 320 }
 321
 322 /** Get the start position (in session frames) of the nth capture in the current pass */
 323 ARDOUR::framepos_t
 324 Diskstream::get_capture_start_frame (uint32_t n) const
 325 {
 326         Glib::Threads::Mutex::Lock lm (capture_info_lock);
 327
 328         if (capture_info.size() > n) {
 329                 /* this is a completed capture */
 330                 return capture_info[n]->start;
 331         } else {
 332                 /* this is the currently in-progress capture */
 333                 return capture_start_frame;
 334         }
 335 }
 336
 337 ARDOUR::framecnt_t
 338 Diskstream::get_captured_frames (uint32_t n) const
 339 {
 340         Glib::Threads::Mutex::Lock lm (capture_info_lock);
 341
 342         if (capture_info.size() > n) {
 343                 /* this is a completed capture */
 344                 return capture_info[n]->frames;
 345         } else {
 346                 /* this is the currently in-progress capture */
 347                 return capture_captured;
 348         }
 349 }
 350
 351 void
 352 Diskstream::set_roll_delay (ARDOUR::framecnt_t nframes)
 353 {
 354         _roll_delay = nframes;
 355 }
 356
 357 int
 358 Diskstream::use_playlist (boost::shared_ptr<Playlist> playlist)
 359 {
 360         if (!playlist) {
 361                 return 0;
 362         }
 363
 364         bool prior_playlist = false;
 365
 366         {
 367                 Glib::Threads::Mutex::Lock lm (state_lock);
 368
 369                 if (playlist == _playlist) {
 370                         return 0;
 371                 }
 372
 373                 playlist_connections.drop_connections ();
 374
 375                 if (_playlist) {
 376                         _playlist->release();
 377                         prior_playlist = true;
 378                 }
 379
 380                 _playlist = playlist;
 381                 _playlist->use();
 382
 383                 if (!in_set_state && destructive() && recordable()) {
 384                         reset_write_sources (false);
 385                 }
 386
 387                 _playlist->ContentsChanged.connect_same_thread (playlist_connections, boost::bind (&Diskstream::playlist_modified, this));
 388                 _playlist->LayeringChanged.connect_same_thread (playlist_connections, boost::bind (&Diskstream::playlist_modified, this));
 389                 _playlist->DropReferences.connect_same_thread (playlist_connections, boost::bind (&Diskstream::playlist_deleted, this, boost::weak_ptr<Playlist>(_playlist)));
 390                 _playlist->RangesMoved.connect_same_thread (playlist_connections, boost::bind (&Diskstream::playlist_ranges_moved, this, _1, _2));
 391         }
 392
 393         /* don't do this if we've already asked for it *or* if we are setting up
 394            the diskstream for the very first time - the input changed handling will
 395            take care of the buffer refill.
 396         */
 397
 398         if (!overwrite_queued && prior_playlist) {
 399                 _session.request_overwrite_buffer (_track);
 400                 overwrite_queued = true;
 401         }
 402
 403         PlaylistChanged (); /* EMIT SIGNAL */
 404         _session.set_dirty ();
 405
 406         return 0;
 407 }
 408
 409 void
 410 Diskstream::playlist_changed (const PropertyChange&)
 411 {
 412         playlist_modified ();
 413 }
 414
 415 void
 416 Diskstream::playlist_modified ()
 417 {
 418         if (!i_am_the_modifier && !overwrite_queued) {
 419                 _session.request_overwrite_buffer (_track);
 420                 overwrite_queued = true;
 421         }
 422 }
 423
 424 void
 425 Diskstream::playlist_deleted (boost::weak_ptr<Playlist> wpl)
 426 {
 427         boost::shared_ptr<Playlist> pl (wpl.lock());
 428
 429         if (pl == _playlist) {
 430
 431                 /* this catches an ordering issue with session destruction. playlists
 432                    are destroyed before diskstreams. we have to invalidate any handles
 433                    we have to the playlist.
 434                 */
 435
 436                 if (_playlist) {
 437                         _playlist.reset ();
 438                 }
 439         }
 440 }
 441
 442 bool
 443 Diskstream::set_name (const string& str)
 444 {
 445         if (_name != str) {
 446                 assert(playlist());
 447                 playlist()->set_name (str);
 448                 SessionObject::set_name(str);
 449         }
 450         return true;
 451 }
 452
 453 bool
 454 Diskstream::set_write_source_name (const std::string& str) {
 455         _write_source_name = str;
 456         return true;
 457 }
 458
 459 XMLNode&
 460 Diskstream::get_state ()
 461 {
 462         XMLNode* node = new XMLNode ("Diskstream");
 463         char buf[64];
 464         LocaleGuard lg;
 465
 466         node->add_property ("flags", enum_2_string (_flags));
 467         node->add_property ("playlist", _playlist->name());
 468         node->add_property("name", _name);
 469         id().print (buf, sizeof (buf));
 470         node->add_property("id", buf);
 471         snprintf (buf, sizeof(buf), "%f", _visible_speed);
 472         node->add_property ("speed", buf);
 473         node->add_property ("capture-alignment", enum_2_string (_alignment_choice));
 474         node->add_property ("record-safe", _record_safe ? "yes" : "no");
 475
 476         if (_extra_xml) {
 477                 node->add_child_copy (*_extra_xml);
 478         }
 479
 480         return *node;
 481 }
 482
 483 int
 484 Diskstream::set_state (const XMLNode& node, int /*version*/)
 485 {
 486         XMLProperty const * prop;
 487
 488         if ((prop = node.property ("name")) != 0) {
 489                 _name = prop->value();
 490         }
 491
 492         if (deprecated_io_node) {
 493                 set_id (*deprecated_io_node);
 494         } else {
 495                 set_id (node);
 496         }
 497
 498         if ((prop = node.property ("flags")) != 0) {
 499                 _flags = Flag (string_2_enum (prop->value(), _flags));
 500         }
 501
 502         if (Profile->get_trx() && (_flags & Destructive)) {
 503                 error << string_compose (_("%1: this session uses destructive tracks, which are not supported"), PROGRAM_NAME) << endmsg;
 504                 return -1;
 505         }
 506
 507         if ((prop = node.property (X_("capture-alignment"))) != 0) {
 508                 set_align_choice (AlignChoice (string_2_enum (prop->value(), _alignment_choice)), true);
 509         } else {
 510                 set_align_choice (Automatic, true);
 511         }
 512
 513         if ((prop = node.property ("playlist")) == 0) {
 514                 return -1;
 515         }
 516
 517         if (find_and_use_playlist (prop->value())) {
 518                 return -1;
 519         }
 520
 521         if ((prop = node.property ("speed")) != 0) {
 522                 double sp = atof (prop->value().c_str());
 523
 524                 if (realtime_set_speed (sp, false)) {
 525                         non_realtime_set_speed ();
 526                 }
 527         }
 528
 529         if ((prop = node.property ("record-safe")) != 0) {
 530             _record_safe = PBD::string_is_affirmative (prop->value()) ? 1 : 0;
 531         }
 532
 533         return 0;
 534 }
 535
 536 void
 537 Diskstream::playlist_ranges_moved (list< Evoral::RangeMove<framepos_t> > const & movements_frames, bool from_undo)
 538 {
 539         /* If we're coming from an undo, it will have handled
 540            automation undo (it must, since automation-follows-regions
 541            can lose automation data).  Hence we can do nothing here.
 542         */
 543
 544         if (from_undo) {
 545                 return;
 546         }
 547
 548         if (!_track || Config->get_automation_follows_regions () == false) {
 549                 return;
 550         }
 551
 552         list< Evoral::RangeMove<double> > movements;
 553
 554         for (list< Evoral::RangeMove<framepos_t> >::const_iterator i = movements_frames.begin();
 555              i != movements_frames.end();
 556              ++i) {
 557
 558                 movements.push_back(Evoral::RangeMove<double>(i->from, i->length, i->to));
 559         }
 560
 561         /* move panner automation */
 562         boost::shared_ptr<Pannable> pannable = _track->pannable();
 563         Evoral::ControlSet::Controls& c (pannable->controls());
 564
 565         for (Evoral::ControlSet::Controls::iterator ci = c.begin(); ci != c.end(); ++ci) {
 566                 boost::shared_ptr<AutomationControl> ac = boost::dynamic_pointer_cast<AutomationControl>(ci->second);
 567                 if (!ac) {
 568                         continue;
 569                 }
 570                 boost::shared_ptr<AutomationList> alist = ac->alist();
 571                 if (!alist->size()) {
 572                         continue;
 573                 }
 574                 XMLNode & before = alist->get_state ();
 575                 bool const things_moved = alist->move_ranges (movements);
 576                 if (things_moved) {
 577                         _session.add_command (new MementoCommand<AutomationList> (
 578                                                       *alist.get(), &before, &alist->get_state ()));
 579                 }
 580         }
 581
 582         /* move processor automation */
 583         _track->foreach_processor (boost::bind (&Diskstream::move_processor_automation, this, _1, movements_frames));
 584 }
 585
 586 void
 587 Diskstream::move_processor_automation (boost::weak_ptr<Processor> p, list< Evoral::RangeMove<framepos_t> > const & movements_frames)
 588 {
 589         boost::shared_ptr<Processor> processor (p.lock ());
 590         if (!processor) {
 591                 return;
 592         }
 593
 594         list< Evoral::RangeMove<double> > movements;
 595         for (list< Evoral::RangeMove<framepos_t> >::const_iterator i = movements_frames.begin(); i != movements_frames.end(); ++i) {
 596                 movements.push_back(Evoral::RangeMove<double>(i->from, i->length, i->to));
 597         }
 598
 599         set<Evoral::Parameter> const a = processor->what_can_be_automated ();
 600
 601         for (set<Evoral::Parameter>::const_iterator i = a.begin (); i != a.end (); ++i) {
 602                 boost::shared_ptr<AutomationList> al = processor->automation_control(*i)->alist();
 603                 if (!al->size()) {
 604                         continue;
 605                 }
 606                 XMLNode & before = al->get_state ();
 607                 bool const things_moved = al->move_ranges (movements);
 608                 if (things_moved) {
 609                         _session.add_command (
 610                                 new MementoCommand<AutomationList> (
 611                                         *al.get(), &before, &al->get_state ()
 612                                         )
 613                                 );
 614                 }
 615         }
 616 }
 617
 618 void
 619 Diskstream::check_record_status (framepos_t transport_frame, bool can_record)
 620 {
 621         int possibly_recording;
 622         int rolling;
 623         int change;
 624         const int transport_rolling = 0x4;
 625         const int track_rec_enabled = 0x2;
 626         const int global_rec_enabled = 0x1;
 627         const int fully_rec_enabled = (transport_rolling|track_rec_enabled|global_rec_enabled);
 628
 629         /* merge together the 3 factors that affect record status, and compute
 630          * what has changed.
 631          */
 632
 633         rolling = _session.transport_speed() != 0.0f;
 634         possibly_recording = (rolling << 2) | ((int)record_enabled() << 1) | (int)can_record;
 635         change = possibly_recording ^ last_possibly_recording;
 636
 637         if (possibly_recording == last_possibly_recording) {
 638                 return;
 639         }
 640
 641         const framecnt_t existing_material_offset = _session.worst_playback_latency();
 642
 643         if (possibly_recording == fully_rec_enabled) {
 644
 645                 if (last_possibly_recording == fully_rec_enabled) {
 646                         return;
 647                 }
 648
 649                 capture_start_frame = _session.transport_frame();
 650                 first_recordable_frame = capture_start_frame + _capture_offset;
 651                 last_recordable_frame = max_framepos;
 652
 653                 DEBUG_TRACE (DEBUG::CaptureAlignment, string_compose ("%1: @ %7 (%9) FRF = %2 CSF = %4 CO = %5, EMO = %6 RD = %8 WOL %10 WTL %11\n",
 654                                                                       name(), first_recordable_frame, last_recordable_frame, capture_start_frame,
 655                                                                       _capture_offset,
 656                                                                       existing_material_offset,
 657                                                                       transport_frame,
 658                                                                       _roll_delay,
 659                                                                       _session.transport_frame(),
 660                                                                       _session.worst_output_latency(),
 661                                                                       _session.worst_track_latency()));
 662
 663
 664                 if (_alignment_style == ExistingMaterial) {
 665                         first_recordable_frame += existing_material_offset;
 666                         DEBUG_TRACE (DEBUG::CaptureAlignment, string_compose ("\tshift FRF by EMO %1\n",
 667                                                                               first_recordable_frame));
 668                 }
 669
 670                 prepare_record_status (capture_start_frame);
 671
 672         } else {
 673
 674                 if (last_possibly_recording == fully_rec_enabled) {
 675
 676                         /* we were recording last time */
 677
 678                         if (change & transport_rolling) {
 679
 680                                 /* transport-change (stopped rolling): last_recordable_frame was set in ::prepare_to_stop(). We
 681                                  * had to set it there because we likely rolled past the stopping point to declick out,
 682                                  * and then backed up.
 683                                  */
 684
 685                         } else {
 686                                 /* punch out */
 687
 688                                 last_recordable_frame = _session.transport_frame() + _capture_offset;
 689
 690                                 if (_alignment_style == ExistingMaterial) {
 691                                         last_recordable_frame += existing_material_offset;
 692                                 }
 693                         }
 694                 }
 695         }
 696
 697         last_possibly_recording = possibly_recording;
 698 }
 699
 700 void
 701 Diskstream::route_going_away ()
 702 {
 703         _io.reset ();
 704 }
 705
 706 void
 707 Diskstream::calculate_record_range (Evoral::OverlapType ot, framepos_t transport_frame, framecnt_t nframes,
 708                                     framecnt_t & rec_nframes, framecnt_t & rec_offset)
 709 {
 710         switch (ot) {
 711         case Evoral::OverlapNone:
 712                 rec_nframes = 0;
 713                 break;
 714
 715         case Evoral::OverlapInternal:
 716                 /*     ----------    recrange
 717                  *       |---|       transrange
 718                  */
 719                 rec_nframes = nframes;
 720                 rec_offset = 0;
 721                 break;
 722
 723         case Evoral::OverlapStart:
 724                 /*    |--------|    recrange
 725                  *  -----|          transrange
 726                  */
 727                 rec_nframes = transport_frame + nframes - first_recordable_frame;
 728                 if (rec_nframes) {
 729                         rec_offset = first_recordable_frame - transport_frame;
 730                 }
 731                 break;
 732
 733         case Evoral::OverlapEnd:
 734                 /*    |--------|    recrange
 735                  *       |--------  transrange
 736                  */
 737                 rec_nframes = last_recordable_frame - transport_frame;
 738                 rec_offset = 0;
 739                 break;
 740
 741         case Evoral::OverlapExternal:
 742                 /*    |--------|    recrange
 743                  *  --------------  transrange
 744                  */
 745                 rec_nframes = last_recordable_frame - first_recordable_frame;
 746                 rec_offset = first_recordable_frame - transport_frame;
 747                 break;
 748         }
 749
 750         DEBUG_TRACE (DEBUG::CaptureAlignment, string_compose ("%1 rec? %2 @ %3 (for %4) FRF %5 LRF %6 : rf %7 @ %8\n",
 751                                                               _name, enum_2_string (ot), transport_frame, nframes,
 752                                                               first_recordable_frame, last_recordable_frame, rec_nframes, rec_offset));
 753 }
 754
 755 void
 756 Diskstream::prepare_to_stop (framepos_t transport_frame, framepos_t audible_frame)
 757 {
 758         switch (_alignment_style) {
 759         case ExistingMaterial:
 760                 last_recordable_frame = transport_frame + _capture_offset;
 761                 DEBUG_TRACE (DEBUG::CaptureAlignment, string_compose("%1: prepare to stop sets last recordable frame to %2 + %3 = %4\n", _name, transport_frame, _capture_offset, last_recordable_frame));
 762                 break;
 763
 764         case CaptureTime:
 765                 last_recordable_frame = audible_frame; // note that capture_offset is zero
 766                 /* we may already have captured audio before the last_recordable_frame (audible frame),
 767                    so deal with this.
 768                 */
 769                 if (last_recordable_frame > capture_start_frame) {
 770                         capture_captured = min (capture_captured, last_recordable_frame - capture_start_frame);
 771                 }
 772                 DEBUG_TRACE (DEBUG::CaptureAlignment, string_compose("%1: prepare to stop sets last recordable frame to audible frame @ %2\n", _name, audible_frame));
 773                 break;
 774         }
 775
 776 }
 777
 778 void
 779 Diskstream::engage_record_enable ()
 780 {
 781         g_atomic_int_set (&_record_enabled, 1);
 782 }
 783
 784 void
 785 Diskstream::disengage_record_enable ()
 786 {
 787         g_atomic_int_set (&_record_enabled, 0);
 788 }
 789
 790 void
 791 Diskstream::engage_record_safe ()
 792 {
 793         g_atomic_int_set (&_record_safe, 1);
 794 }
 795
 796 void
 797 Diskstream::disengage_record_safe ()
 798 {
 799         g_atomic_int_set (&_record_safe, 0);
 800 }
 801
 802 framecnt_t
 803 Diskstream::default_disk_read_chunk_frames()
 804 {
 805         return 65536;
 806 }
 807
 808 framecnt_t
 809 Diskstream::default_disk_write_chunk_frames ()
 810 {
 811         return 65536;
 812 }
 813
 814 void
 815 Diskstream::set_buffering_parameters (BufferingPreset bp)
 816 {
 817         framecnt_t read_chunk_size;
 818         framecnt_t read_buffer_size;
 819         framecnt_t write_chunk_size;
 820         framecnt_t write_buffer_size;
 821
 822         if (!get_buffering_presets (bp, read_chunk_size, read_buffer_size, write_chunk_size, write_buffer_size)) {
 823                 return;
 824         }
 825
 826         disk_read_chunk_frames = read_chunk_size;
 827         disk_write_chunk_frames = write_chunk_size;
 828         Config->set_audio_capture_buffer_seconds (write_buffer_size);
 829         Config->set_audio_playback_buffer_seconds (read_buffer_size);
 830
 831         cerr << "Set buffering params to " << disk_read_chunk_frames << '|' << disk_write_chunk_frames << '|'
 832              << Config->get_audio_playback_buffer_seconds() << '|'
 833              << Config->get_audio_capture_buffer_seconds ()
 834              << endl;
 835 }
 836
 837 bool
 838 Diskstream::get_buffering_presets (BufferingPreset bp,
 839                                    framecnt_t& read_chunk_size,
 840                                    framecnt_t& read_buffer_size,
 841                                    framecnt_t& write_chunk_size,
 842                                    framecnt_t& write_buffer_size)
 843 {
 844         switch (bp) {
 845         case Small:
 846                 read_chunk_size = 65536;  /* samples */
 847                 write_chunk_size = 65536; /* samples */
 848                 read_buffer_size = 5;  /* seconds */
 849                 write_buffer_size = 5; /* seconds */
 850                 break;
 851
 852         case Medium:
 853                 read_chunk_size = 262144;  /* samples */
 854                 write_chunk_size = 131072; /* samples */
 855                 read_buffer_size = 10;  /* seconds */
 856                 write_buffer_size = 10; /* seconds */
 857                 break;
 858
 859         case Large:
 860                 read_chunk_size = 524288; /* samples */
 861                 write_chunk_size = 131072; /* samples */
 862                 read_buffer_size = 20; /* seconds */
 863                 write_buffer_size = 20; /* seconds */
 864                 break;
 865
 866         default:
 867                 return false;
 868         }
 869
 870         return true;
 871 }