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 <fstream>
  21 #include <cassert>
  22 #include <cstdio>
  23 #include <unistd.h>
  24 #include <cmath>
  25 #include <cerrno>
  26 #include <string>
  27 #include <climits>
  28 #include <fcntl.h>
  29 #include <cstdlib>
  30 #include <ctime>
  31 #include <sys/stat.h>
  32
  33 #include <glibmm/threads.h>
  34
  35 #include "pbd/error.h"
  36 #include "pbd/basename.h"
  37 #include "pbd/memento_command.h"
  38 #include "pbd/xml++.h"
  39 #include "pbd/stacktrace.h"
  40
  41 #include "ardour/debug.h"
  42 #include "ardour/diskstream.h"
  43 #include "ardour/io.h"
  44 #include "ardour/pannable.h"
  45 #include "ardour/profile.h"
  46 #include "ardour/playlist.h"
  47 #include "ardour/session.h"
  48 #include "ardour/track.h"
  49
  50 #include "i18n.h"
  51 #include <locale.h>
  52
  53 using namespace std;
  54 using namespace ARDOUR;
  55 using namespace PBD;
  56
  57 ARDOUR::framecnt_t Diskstream::disk_read_chunk_frames = default_disk_read_chunk_frames ();
  58 ARDOUR::framecnt_t Diskstream::disk_write_chunk_frames = default_disk_write_chunk_frames ();
  59
  60 PBD::Signal0<void>                Diskstream::DiskOverrun;
  61 PBD::Signal0<void>                Diskstream::DiskUnderrun;
  62
  63 Diskstream::Diskstream (Session &sess, const string &name, Flag flag)
  64         : SessionObject(sess, name)
  65         , i_am_the_modifier (0)
  66         , _track (0)
  67         , _record_enabled (0)
  68             , _record_safe (0)
  69         , _visible_speed (1.0f)
  70         , _actual_speed (1.0f)
  71         , _buffer_reallocation_required (false)
  72         , _seek_required (false)
  73         , capture_start_frame (0)
  74         , capture_captured (0)
  75         , was_recording (false)
  76         , adjust_capture_position (0)
  77         , _capture_offset (0)
  78         , _roll_delay (0)
  79         , first_recordable_frame (max_framepos)
  80         , last_recordable_frame (max_framepos)
  81         , last_possibly_recording (0)
  82         , _alignment_style (ExistingMaterial)
  83         , _alignment_choice (Automatic)
  84         , _slaved (false)
  85         , loop_location (0)
  86         , overwrite_frame (0)
  87         , overwrite_offset (0)
  88         , _pending_overwrite (false)
  89         , overwrite_queued (false)
  90         , wrap_buffer_size (0)
  91         , speed_buffer_size (0)
  92         , _speed (1.0)
  93         , _target_speed (_speed)
  94         , file_frame (0)
  95         , playback_sample (0)
  96         , in_set_state (false)
  97         , _flags (flag)
  98         , deprecated_io_node (0)
  99 {
 100 }
 101
 102 Diskstream::Diskstream (Session& sess, const XMLNode& /*node*/)
 103         : SessionObject(sess, "unnamed diskstream")
 104         , i_am_the_modifier (0)
 105         , _track (0)
 106         , _record_enabled (0)
 107             , _record_safe (0)
 108         , _visible_speed (1.0f)
 109         , _actual_speed (1.0f)
 110         , _buffer_reallocation_required (false)
 111         , _seek_required (false)
 112         , capture_start_frame (0)
 113         , capture_captured (0)
 114         , was_recording (false)
 115         , adjust_capture_position (0)
 116         , _capture_offset (0)
 117         , _roll_delay (0)
 118         , first_recordable_frame (max_framepos)
 119         , last_recordable_frame (max_framepos)
 120         , last_possibly_recording (0)
 121         , _alignment_style (ExistingMaterial)
 122         , _alignment_choice (Automatic)
 123         , _slaved (false)
 124         , loop_location (0)
 125         , overwrite_frame (0)
 126         , overwrite_offset (0)
 127         , _pending_overwrite (false)
 128         , overwrite_queued (false)
 129         , wrap_buffer_size (0)
 130         , speed_buffer_size (0)
 131         , _speed (1.0)
 132         , _target_speed (_speed)
 133         , file_frame (0)
 134         , playback_sample (0)
 135         , in_set_state (false)
 136         , _flags (Recordable)
 137         , deprecated_io_node (0)
 138 {
 139 }
 140
 141 Diskstream::~Diskstream ()
 142 {
 143         DEBUG_TRACE (DEBUG::Destruction, string_compose ("Diskstream %1 deleted\n", _name));
 144
 145         if (_playlist) {
 146                 _playlist->release ();
 147         }
 148
 149         delete deprecated_io_node;
 150 }
 151
 152 void
 153 Diskstream::set_track (Track* t)
 154 {
 155         _track = t;
 156         _io = _track->input();
 157
 158         ic_connection.disconnect();
 159         _io->changed.connect_same_thread (ic_connection, boost::bind (&Diskstream::handle_input_change, this, _1, _2));
 160
 161         if (_io->n_ports() != ChanCount::ZERO) {
 162                 input_change_pending.type = IOChange::Type (IOChange::ConfigurationChanged|IOChange::ConnectionsChanged);
 163                 non_realtime_input_change ();
 164         }
 165
 166         _track->Destroyed.connect_same_thread (*this, boost::bind (&Diskstream::route_going_away, this));
 167 }
 168
 169 void
 170 Diskstream::handle_input_change (IOChange change, void * /*src*/)
 171 {
 172         Glib::Threads::Mutex::Lock lm (state_lock);
 173
 174         if (change.type & (IOChange::ConfigurationChanged|IOChange::ConnectionsChanged)) {
 175
 176                 /* rather than handle this here on a DS-by-DS basis we defer to the
 177                    session transport/butler thread, and let it tackle
 178                    as many diskstreams as need it in one shot. this avoids many repeated
 179                    takings of the audioengine process lock.
 180                 */
 181
 182                 if (!(input_change_pending.type & change.type)) {
 183                         input_change_pending.type = IOChange::Type (input_change_pending.type | change.type);
 184                         _session.request_input_change_handling ();
 185                 }
 186         }
 187 }
 188
 189 void
 190 Diskstream::non_realtime_set_speed ()
 191 {
 192         if (_buffer_reallocation_required)
 193         {
 194                 Glib::Threads::Mutex::Lock lm (state_lock);
 195                 allocate_temporary_buffers ();
 196
 197                 _buffer_reallocation_required = false;
 198         }
 199
 200         if (_seek_required) {
 201                 if (speed() != 1.0f || speed() != -1.0f) {
 202                         seek ((framepos_t) (_session.transport_frame() * (double) speed()), true);
 203                 }
 204                 else {
 205                         seek (_session.transport_frame(), true);
 206                 }
 207
 208                 _seek_required = false;
 209         }
 210 }
 211
 212 bool
 213 Diskstream::realtime_set_speed (double sp, bool global)
 214 {
 215         bool changed = false;
 216         double new_speed = sp * _session.transport_speed();
 217
 218         if (_visible_speed != sp) {
 219                 _visible_speed = sp;
 220                 changed = true;
 221         }
 222
 223         if (new_speed != _actual_speed) {
 224
 225                 framecnt_t required_wrap_size = (framecnt_t) ceil (_session.get_block_size() *
 226                                                                   fabs (new_speed)) + 2;
 227
 228                 if (required_wrap_size > wrap_buffer_size) {
 229                         _buffer_reallocation_required = true;
 230                 }
 231
 232                 _actual_speed = new_speed;
 233                 _target_speed = fabs(_actual_speed);
 234         }
 235
 236         if (changed) {
 237                 if (!global) {
 238                         _seek_required = true;
 239                 }
 240                 SpeedChanged (); /* EMIT SIGNAL */
 241         }
 242
 243         return _buffer_reallocation_required || _seek_required;
 244 }
 245
 246 void
 247 Diskstream::set_capture_offset ()
 248 {
 249         if (_io == 0) {
 250                 /* can't capture, so forget it */
 251                 return;
 252         }
 253
 254         switch (_alignment_style) {
 255         case ExistingMaterial:
 256                 _capture_offset = _io->latency();
 257                 break;
 258
 259         case CaptureTime:
 260         default:
 261                 _capture_offset = 0;
 262                 break;
 263         }
 264
 265         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)));
 266 }
 267
 268
 269 void
 270 Diskstream::set_align_style (AlignStyle a, bool force)
 271 {
 272         if (record_enabled() && _session.actively_recording()) {
 273                 return;
 274         }
 275
 276         if ((a != _alignment_style) || force) {
 277                 _alignment_style = a;
 278                 set_capture_offset ();
 279                 AlignmentStyleChanged ();
 280         }
 281 }
 282
 283 void
 284 Diskstream::set_align_choice (AlignChoice a, bool force)
 285 {
 286         if (record_enabled() && _session.actively_recording()) {
 287                 return;
 288         }
 289
 290         if ((a != _alignment_choice) || force) {
 291                 _alignment_choice = a;
 292
 293                 switch (_alignment_choice) {
 294                         case Automatic:
 295                                 set_align_style_from_io ();
 296                                 break;
 297                         case UseExistingMaterial:
 298                                 set_align_style (ExistingMaterial);
 299                                 break;
 300                         case UseCaptureTime:
 301                                 set_align_style (CaptureTime);
 302                                 break;
 303                 }
 304         }
 305 }
 306
 307 int
 308 Diskstream::set_loop (Location *location)
 309 {
 310         if (location) {
 311                 if (location->start() >= location->end()) {
 312                         error << string_compose(_("Location \"%1\" not valid for track loop (start >= end)"), location->name()) << endl;
 313                         return -1;
 314                 }
 315         }
 316
 317         loop_location = location;
 318
 319         LoopSet (location); /* EMIT SIGNAL */
 320         return 0;
 321 }
 322
 323 /** Get the start position (in session frames) of the nth capture in the current pass */
 324 ARDOUR::framepos_t
 325 Diskstream::get_capture_start_frame (uint32_t n) const
 326 {
 327         Glib::Threads::Mutex::Lock lm (capture_info_lock);
 328
 329         if (capture_info.size() > n) {
 330                 /* this is a completed capture */
 331                 return capture_info[n]->start;
 332         } else {
 333                 /* this is the currently in-progress capture */
 334                 return capture_start_frame;
 335         }
 336 }
 337
 338 ARDOUR::framecnt_t
 339 Diskstream::get_captured_frames (uint32_t n) const
 340 {
 341         Glib::Threads::Mutex::Lock lm (capture_info_lock);
 342
 343         if (capture_info.size() > n) {
 344                 /* this is a completed capture */
 345                 return capture_info[n]->frames;
 346         } else {
 347                 /* this is the currently in-progress capture */
 348                 return capture_captured;
 349         }
 350 }
 351
 352 void
 353 Diskstream::set_roll_delay (ARDOUR::framecnt_t nframes)
 354 {
 355         _roll_delay = nframes;
 356 }
 357
 358 int
 359 Diskstream::use_playlist (boost::shared_ptr<Playlist> playlist)
 360 {
 361         if (!playlist) {
 362                 return 0;
 363         }
 364
 365         bool prior_playlist = false;
 366
 367         {
 368                 Glib::Threads::Mutex::Lock lm (state_lock);
 369
 370                 if (playlist == _playlist) {
 371                         return 0;
 372                 }
 373
 374                 playlist_connections.drop_connections ();
 375
 376                 if (_playlist) {
 377                         _playlist->release();
 378                         prior_playlist = true;
 379                 }
 380
 381                 _playlist = playlist;
 382                 _playlist->use();
 383
 384                 if (!in_set_state && recordable()) {
 385                         reset_write_sources (false);
 386                 }
 387
 388                 _playlist->ContentsChanged.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 (X_("C"));
 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         const XMLProperty* 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
 572                 XMLNode & before = alist->get_state ();
 573                 bool const things_moved = alist->move_ranges (movements);
 574                 if (things_moved) {
 575                         _session.add_command (new MementoCommand<AutomationList> (
 576                                                       *alist.get(), &before, &alist->get_state ()));
 577                 }
 578         }
 579
 580         /* move processor automation */
 581         _track->foreach_processor (boost::bind (&Diskstream::move_processor_automation, this, _1, movements_frames));
 582 }
 583
 584 void
 585 Diskstream::move_processor_automation (boost::weak_ptr<Processor> p, list< Evoral::RangeMove<framepos_t> > const & movements_frames)
 586 {
 587         boost::shared_ptr<Processor> processor (p.lock ());
 588         if (!processor) {
 589                 return;
 590         }
 591
 592         list< Evoral::RangeMove<double> > movements;
 593         for (list< Evoral::RangeMove<framepos_t> >::const_iterator i = movements_frames.begin(); i != movements_frames.end(); ++i) {
 594                 movements.push_back(Evoral::RangeMove<double>(i->from, i->length, i->to));
 595         }
 596
 597         set<Evoral::Parameter> const a = processor->what_can_be_automated ();
 598
 599         for (set<Evoral::Parameter>::const_iterator i = a.begin (); i != a.end (); ++i) {
 600                 boost::shared_ptr<AutomationList> al = processor->automation_control(*i)->alist();
 601                 XMLNode & before = al->get_state ();
 602                 bool const things_moved = al->move_ranges (movements);
 603                 if (things_moved) {
 604                         _session.add_command (
 605                                 new MementoCommand<AutomationList> (
 606                                         *al.get(), &before, &al->get_state ()
 607                                         )
 608                                 );
 609                 }
 610         }
 611 }
 612
 613 void
 614 Diskstream::check_record_status (framepos_t transport_frame, bool can_record)
 615 {
 616         int possibly_recording;
 617         int rolling;
 618         int change;
 619         const int transport_rolling = 0x4;
 620         const int track_rec_enabled = 0x2;
 621         const int global_rec_enabled = 0x1;
 622         const int fully_rec_enabled = (transport_rolling|track_rec_enabled|global_rec_enabled);
 623
 624         /* merge together the 3 factors that affect record status, and compute
 625          * what has changed.
 626          */
 627
 628         rolling = _session.transport_speed() != 0.0f;
 629         possibly_recording = (rolling << 2) | ((int)record_enabled() << 1) | (int)can_record;
 630         change = possibly_recording ^ last_possibly_recording;
 631
 632         if (possibly_recording == last_possibly_recording) {
 633                 return;
 634         }
 635
 636         const framecnt_t existing_material_offset = _session.worst_playback_latency();
 637
 638         if (possibly_recording == fully_rec_enabled) {
 639
 640                 if (last_possibly_recording == fully_rec_enabled) {
 641                         return;
 642                 }
 643
 644                 capture_start_frame = _session.transport_frame();
 645                 first_recordable_frame = capture_start_frame + _capture_offset;
 646                 last_recordable_frame = max_framepos;
 647
 648                 DEBUG_TRACE (DEBUG::CaptureAlignment, string_compose ("%1: @ %7 (%9) FRF = %2 CSF = %4 CO = %5, EMO = %6 RD = %8 WOL %10 WTL %11\n",
 649                                                                       name(), first_recordable_frame, last_recordable_frame, capture_start_frame,
 650                                                                       _capture_offset,
 651                                                                       existing_material_offset,
 652                                                                       transport_frame,
 653                                                                       _roll_delay,
 654                                                                       _session.transport_frame(),
 655                                                                       _session.worst_output_latency(),
 656                                                                       _session.worst_track_latency()));
 657
 658
 659                 if (_alignment_style == ExistingMaterial) {
 660                         first_recordable_frame += existing_material_offset;
 661                         DEBUG_TRACE (DEBUG::CaptureAlignment, string_compose ("\tshift FRF by EMO %1\n",
 662                                                                               first_recordable_frame));
 663                 }
 664
 665                 prepare_record_status (capture_start_frame);
 666
 667         } else {
 668
 669                 if (last_possibly_recording == fully_rec_enabled) {
 670
 671                         /* we were recording last time */
 672
 673                         if (change & transport_rolling) {
 674
 675                                 /* transport-change (stopped rolling): last_recordable_frame was set in ::prepare_to_stop(). We
 676                                  * had to set it there because we likely rolled past the stopping point to declick out,
 677                                  * and then backed up.
 678                                  */
 679
 680                         } else {
 681                                 /* punch out */
 682
 683                                 last_recordable_frame = _session.transport_frame() + _capture_offset;
 684
 685                                 if (_alignment_style == ExistingMaterial) {
 686                                         last_recordable_frame += existing_material_offset;
 687                                 }
 688                         }
 689                 }
 690         }
 691
 692         last_possibly_recording = possibly_recording;
 693 }
 694
 695 void
 696 Diskstream::route_going_away ()
 697 {
 698         _io.reset ();
 699 }
 700
 701 void
 702 Diskstream::calculate_record_range (Evoral::OverlapType ot, framepos_t transport_frame, framecnt_t nframes,
 703                                     framecnt_t & rec_nframes, framecnt_t & rec_offset)
 704 {
 705         switch (ot) {
 706         case Evoral::OverlapNone:
 707                 rec_nframes = 0;
 708                 break;
 709
 710         case Evoral::OverlapInternal:
 711                 /*     ----------    recrange
 712                  *       |---|       transrange
 713                  */
 714                 rec_nframes = nframes;
 715                 rec_offset = 0;
 716                 break;
 717
 718         case Evoral::OverlapStart:
 719                 /*    |--------|    recrange
 720                  *  -----|          transrange
 721                  */
 722                 rec_nframes = transport_frame + nframes - first_recordable_frame;
 723                 if (rec_nframes) {
 724                         rec_offset = first_recordable_frame - transport_frame;
 725                 }
 726                 break;
 727
 728         case Evoral::OverlapEnd:
 729                 /*    |--------|    recrange
 730                  *       |--------  transrange
 731                  */
 732                 rec_nframes = last_recordable_frame - transport_frame;
 733                 rec_offset = 0;
 734                 break;
 735
 736         case Evoral::OverlapExternal:
 737                 /*    |--------|    recrange
 738                  *  --------------  transrange
 739                  */
 740                 rec_nframes = last_recordable_frame - first_recordable_frame;
 741                 rec_offset = first_recordable_frame - transport_frame;
 742                 break;
 743         }
 744
 745         DEBUG_TRACE (DEBUG::CaptureAlignment, string_compose ("%1 rec? %2 @ %3 (for %4) FRF %5 LRF %6 : rf %7 @ %8\n",
 746                                                               _name, enum_2_string (ot), transport_frame, nframes,
 747                                                               first_recordable_frame, last_recordable_frame, rec_nframes, rec_offset));
 748 }
 749
 750 void
 751 Diskstream::prepare_to_stop (framepos_t transport_frame, framepos_t audible_frame)
 752 {
 753         switch (_alignment_style) {
 754         case ExistingMaterial:
 755                 last_recordable_frame = transport_frame + _capture_offset;
 756                 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));
 757                 break;
 758
 759         case CaptureTime:
 760                 last_recordable_frame = audible_frame; // note that capture_offset is zero
 761                 /* we may already have captured audio before the last_recordable_frame (audible frame),
 762                    so deal with this.
 763                 */
 764                 if (last_recordable_frame > capture_start_frame) {
 765                         capture_captured = min (capture_captured, last_recordable_frame - capture_start_frame);
 766                 }
 767                 DEBUG_TRACE (DEBUG::CaptureAlignment, string_compose("%1: prepare to stop sets last recordable frame to audible frame @ %2\n", _name, audible_frame));
 768                 break;
 769         }
 770
 771 }
 772
 773 void
 774 Diskstream::engage_record_enable ()
 775 {
 776         g_atomic_int_set (&_record_enabled, 1);
 777 }
 778
 779 void
 780 Diskstream::disengage_record_enable ()
 781 {
 782         g_atomic_int_set (&_record_enabled, 0);
 783 }
 784
 785 void
 786 Diskstream::engage_record_safe ()
 787 {
 788         g_atomic_int_set (&_record_safe, 1);
 789 }
 790
 791 void
 792 Diskstream::disengage_record_safe ()
 793 {
 794         g_atomic_int_set (&_record_safe, 0);
 795 }
 796
 797 framecnt_t
 798 Diskstream::default_disk_read_chunk_frames()
 799 {
 800         return 65536;
 801 }
 802
 803 framecnt_t
 804 Diskstream::default_disk_write_chunk_frames ()
 805 {
 806         return 65536;
 807 }
 808
 809 void
 810 Diskstream::set_buffering_parameters (BufferingPreset bp)
 811 {
 812         framecnt_t read_chunk_size;
 813         framecnt_t read_buffer_size;
 814         framecnt_t write_chunk_size;
 815         framecnt_t write_buffer_size;
 816
 817         if (!get_buffering_presets (bp, read_chunk_size, read_buffer_size, write_chunk_size, write_buffer_size)) {
 818                 return;
 819         }
 820
 821         disk_read_chunk_frames = read_chunk_size;
 822         disk_write_chunk_frames = write_chunk_size;
 823         Config->set_audio_capture_buffer_seconds (write_buffer_size);
 824         Config->set_audio_playback_buffer_seconds (read_buffer_size);
 825
 826         cerr << "Set buffering params to " << disk_read_chunk_frames << '|' << disk_write_chunk_frames << '|'
 827              << Config->get_audio_playback_buffer_seconds() << '|'
 828              << Config->get_audio_capture_buffer_seconds ()
 829              << endl;
 830 }
 831
 832 bool
 833 Diskstream::get_buffering_presets (BufferingPreset bp,
 834                                    framecnt_t& read_chunk_size,
 835                                    framecnt_t& read_buffer_size,
 836                                    framecnt_t& write_chunk_size,
 837                                    framecnt_t& write_buffer_size)
 838 {
 839         switch (bp) {
 840         case Small:
 841                 read_chunk_size = 65536;  /* samples */
 842                 write_chunk_size = 65536; /* samples */
 843                 read_buffer_size = 5;  /* seconds */
 844                 write_buffer_size = 5; /* seconds */
 845                 break;
 846
 847         case Medium:
 848                 read_chunk_size = 262144;  /* samples */
 849                 write_chunk_size = 131072; /* samples */
 850                 read_buffer_size = 10;  /* seconds */
 851                 write_buffer_size = 10; /* seconds */
 852                 break;
 853
 854         case Large:
 855                 read_chunk_size = 524288; /* samples */
 856                 write_chunk_size = 131072; /* samples */
 857                 read_buffer_size = 20; /* seconds */
 858                 write_buffer_size = 20; /* seconds */
 859                 break;
 860
 861         default:
 862                 return false;
 863         }
 864
 865         return true;
 866 }
 867