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 #include "pbd/enum_convert.h"
  40 #include "pbd/types_convert.h"
  41
  42 #include "ardour/debug.h"
  43 #include "ardour/diskstream.h"
  44 #include "ardour/io.h"
  45 #include "ardour/pannable.h"
  46 #include "ardour/profile.h"
  47 #include "ardour/playlist.h"
  48 #include "ardour/session.h"
  49 #include "ardour/track.h"
  50 #include "ardour/types_convert.h"
  51
  52 #include "pbd/i18n.h"
  53 #include <locale.h>
  54
  55 using namespace std;
  56 using namespace ARDOUR;
  57 using namespace PBD;
  58
  59 namespace PBD {
  60         DEFINE_ENUM_CONVERT(Diskstream::Flag);
  61 }
  62
  63 ARDOUR::framecnt_t Diskstream::disk_read_chunk_frames = default_disk_read_chunk_frames ();
  64 ARDOUR::framecnt_t Diskstream::disk_write_chunk_frames = default_disk_write_chunk_frames ();
  65
  66 PBD::Signal0<void>                Diskstream::DiskOverrun;
  67 PBD::Signal0<void>                Diskstream::DiskUnderrun;
  68
  69 Diskstream::Diskstream (Session &sess, const string &name, Flag flag)
  70         : SessionObject(sess, name)
  71         , i_am_the_modifier (0)
  72         , _track (0)
  73         , _record_enabled (0)
  74             , _record_safe (0)
  75         , _visible_speed (1.0f)
  76         , _actual_speed (1.0f)
  77         , _buffer_reallocation_required (false)
  78         , _seek_required (false)
  79         , capture_start_frame (0)
  80         , capture_captured (0)
  81         , was_recording (false)
  82         , adjust_capture_position (0)
  83         , _capture_offset (0)
  84         , _roll_delay (0)
  85         , first_recordable_frame (max_framepos)
  86         , last_recordable_frame (max_framepos)
  87         , last_possibly_recording (0)
  88         , _alignment_style (ExistingMaterial)
  89         , _alignment_choice (Automatic)
  90         , _slaved (false)
  91         , loop_location (0)
  92         , overwrite_frame (0)
  93         , overwrite_offset (0)
  94         , _pending_overwrite (false)
  95         , overwrite_queued (false)
  96         , wrap_buffer_size (0)
  97         , speed_buffer_size (0)
  98         , _speed (1.0)
  99         , _target_speed (_speed)
 100         , file_frame (0)
 101         , playback_sample (0)
 102         , in_set_state (false)
 103         , _flags (flag)
 104         , deprecated_io_node (0)
 105 {
 106 }
 107
 108 Diskstream::Diskstream (Session& sess, const XMLNode& /*node*/)
 109         : SessionObject(sess, "unnamed diskstream")
 110         , i_am_the_modifier (0)
 111         , _track (0)
 112         , _record_enabled (0)
 113             , _record_safe (0)
 114         , _visible_speed (1.0f)
 115         , _actual_speed (1.0f)
 116         , _buffer_reallocation_required (false)
 117         , _seek_required (false)
 118         , capture_start_frame (0)
 119         , capture_captured (0)
 120         , was_recording (false)
 121         , adjust_capture_position (0)
 122         , _capture_offset (0)
 123         , _roll_delay (0)
 124         , first_recordable_frame (max_framepos)
 125         , last_recordable_frame (max_framepos)
 126         , last_possibly_recording (0)
 127         , _alignment_style (ExistingMaterial)
 128         , _alignment_choice (Automatic)
 129         , _slaved (false)
 130         , loop_location (0)
 131         , overwrite_frame (0)
 132         , overwrite_offset (0)
 133         , _pending_overwrite (false)
 134         , overwrite_queued (false)
 135         , wrap_buffer_size (0)
 136         , speed_buffer_size (0)
 137         , _speed (1.0)
 138         , _target_speed (_speed)
 139         , file_frame (0)
 140         , playback_sample (0)
 141         , in_set_state (false)
 142         , _flags (Recordable)
 143         , deprecated_io_node (0)
 144 {
 145 }
 146
 147 Diskstream::~Diskstream ()
 148 {
 149         DEBUG_TRACE (DEBUG::Destruction, string_compose ("Diskstream %1 deleted\n", _name));
 150
 151         if (_playlist) {
 152                 _playlist->release ();
 153         }
 154
 155         delete deprecated_io_node;
 156 }
 157
 158 bool
 159 Diskstream::non_layered () const
 160 {
 161         return _session.config.get_layered_record_mode();
 162 }
 163
 164 void
 165 Diskstream::set_track (Track* t)
 166 {
 167         _track = t;
 168         _io = _track->input();
 169
 170         ic_connection.disconnect();
 171         _io->changed.connect_same_thread (ic_connection, boost::bind (&Diskstream::handle_input_change, this, _1, _2));
 172
 173         if (_io->n_ports() != ChanCount::ZERO) {
 174                 input_change_pending.type = IOChange::Type (IOChange::ConfigurationChanged|IOChange::ConnectionsChanged);
 175                 non_realtime_input_change ();
 176         }
 177
 178         _track->Destroyed.connect_same_thread (*this, boost::bind (&Diskstream::route_going_away, this));
 179 }
 180
 181 void
 182 Diskstream::handle_input_change (IOChange change, void * /*src*/)
 183 {
 184         Glib::Threads::Mutex::Lock lm (state_lock);
 185
 186         if (change.type & (IOChange::ConfigurationChanged|IOChange::ConnectionsChanged)) {
 187
 188                 /* rather than handle this here on a DS-by-DS basis we defer to the
 189                    session transport/butler thread, and let it tackle
 190                    as many diskstreams as need it in one shot. this avoids many repeated
 191                    takings of the audioengine process lock.
 192                 */
 193
 194                 if (!(input_change_pending.type & change.type)) {
 195                         input_change_pending.type = IOChange::Type (input_change_pending.type | change.type);
 196                         _session.request_input_change_handling ();
 197                 }
 198         }
 199 }
 200
 201 void
 202 Diskstream::non_realtime_set_speed ()
 203 {
 204         if (_buffer_reallocation_required)
 205         {
 206                 Glib::Threads::Mutex::Lock lm (state_lock);
 207                 allocate_temporary_buffers ();
 208
 209                 _buffer_reallocation_required = false;
 210         }
 211
 212         if (_seek_required) {
 213                 if (speed() != 1.0f || speed() != -1.0f) {
 214                         seek ((framepos_t) (_session.transport_frame() * (double) speed()), true);
 215                 }
 216                 else {
 217                         seek (_session.transport_frame(), true);
 218                 }
 219
 220                 _seek_required = false;
 221         }
 222 }
 223
 224 bool
 225 Diskstream::realtime_set_speed (double sp, bool global)
 226 {
 227         bool changed = false;
 228         double new_speed = sp * _session.transport_speed();
 229
 230         if (_visible_speed != sp) {
 231                 _visible_speed = sp;
 232                 changed = true;
 233         }
 234
 235         if (new_speed != _actual_speed) {
 236
 237                 framecnt_t required_wrap_size = (framecnt_t) ceil (_session.get_block_size() *
 238                                                                   fabs (new_speed)) + 2;
 239
 240                 if (required_wrap_size > wrap_buffer_size) {
 241                         _buffer_reallocation_required = true;
 242                 }
 243
 244                 _actual_speed = new_speed;
 245                 _target_speed = fabs(_actual_speed);
 246         }
 247
 248         if (changed) {
 249                 if (!global) {
 250                         _seek_required = true;
 251                 }
 252                 SpeedChanged (); /* EMIT SIGNAL */
 253         }
 254
 255         return _buffer_reallocation_required || _seek_required;
 256 }
 257
 258 void
 259 Diskstream::set_capture_offset ()
 260 {
 261         if (_io == 0) {
 262                 /* can't capture, so forget it */
 263                 return;
 264         }
 265
 266         switch (_alignment_style) {
 267         case ExistingMaterial:
 268                 _capture_offset = _io->latency();
 269                 break;
 270
 271         case CaptureTime:
 272         default:
 273                 _capture_offset = 0;
 274                 break;
 275         }
 276 #ifdef MIXBUS
 277         framecnt_t port_offset;
 278         if (_track->mixbus_internal_bounce (port_offset)) {
 279                 /* _capture_offset may become negative, but the sum
 280                  * _capture_offset + existing_material_offset
 281                  * will be postive.
 282                  */
 283                 _capture_offset -= port_offset;
 284         }
 285 #endif
 286
 287         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)));
 288 }
 289
 290
 291 void
 292 Diskstream::set_align_style (AlignStyle a, bool force)
 293 {
 294         if (record_enabled() && _session.actively_recording()) {
 295                 return;
 296         }
 297
 298         if ((a != _alignment_style) || force) {
 299                 _alignment_style = a;
 300                 set_capture_offset ();
 301                 AlignmentStyleChanged ();
 302         }
 303 }
 304
 305 void
 306 Diskstream::set_align_choice (AlignChoice a, bool force)
 307 {
 308         if (record_enabled() && _session.actively_recording()) {
 309                 return;
 310         }
 311
 312         if ((a != _alignment_choice) || force) {
 313                 _alignment_choice = a;
 314
 315                 switch (_alignment_choice) {
 316                         case Automatic:
 317                                 set_align_style_from_io ();
 318                                 break;
 319                         case UseExistingMaterial:
 320                                 set_align_style (ExistingMaterial);
 321                                 break;
 322                         case UseCaptureTime:
 323                                 set_align_style (CaptureTime);
 324                                 break;
 325                 }
 326         }
 327 }
 328
 329 int
 330 Diskstream::set_loop (Location *location)
 331 {
 332         if (location) {
 333                 if (location->start() >= location->end()) {
 334                         error << string_compose(_("Location \"%1\" not valid for track loop (start >= end)"), location->name()) << endl;
 335                         return -1;
 336                 }
 337         }
 338
 339         loop_location = location;
 340
 341         LoopSet (location); /* EMIT SIGNAL */
 342         return 0;
 343 }
 344
 345 /** Get the start position (in session frames) of the nth capture in the current pass */
 346 ARDOUR::framepos_t
 347 Diskstream::get_capture_start_frame (uint32_t n) const
 348 {
 349         Glib::Threads::Mutex::Lock lm (capture_info_lock);
 350
 351         if (capture_info.size() > n) {
 352                 /* this is a completed capture */
 353                 return capture_info[n]->start;
 354         } else {
 355                 /* this is the currently in-progress capture */
 356                 return capture_start_frame;
 357         }
 358 }
 359
 360 ARDOUR::framecnt_t
 361 Diskstream::get_captured_frames (uint32_t n) const
 362 {
 363         Glib::Threads::Mutex::Lock lm (capture_info_lock);
 364
 365         if (capture_info.size() > n) {
 366                 /* this is a completed capture */
 367                 return capture_info[n]->frames;
 368         } else {
 369                 /* this is the currently in-progress capture */
 370                 return capture_captured;
 371         }
 372 }
 373
 374 void
 375 Diskstream::set_roll_delay (ARDOUR::framecnt_t nframes)
 376 {
 377         _roll_delay = nframes;
 378 }
 379
 380 int
 381 Diskstream::use_playlist (boost::shared_ptr<Playlist> playlist)
 382 {
 383         if (!playlist) {
 384                 return 0;
 385         }
 386
 387         bool prior_playlist = false;
 388
 389         {
 390                 Glib::Threads::Mutex::Lock lm (state_lock);
 391
 392                 if (playlist == _playlist) {
 393                         return 0;
 394                 }
 395
 396                 playlist_connections.drop_connections ();
 397
 398                 if (_playlist) {
 399                         _playlist->release();
 400                         prior_playlist = true;
 401                 }
 402
 403                 _playlist = playlist;
 404                 _playlist->use();
 405
 406                 if (!in_set_state && destructive() && recordable()) {
 407                         reset_write_sources (false);
 408                 }
 409
 410                 _playlist->ContentsChanged.connect_same_thread (playlist_connections, boost::bind (&Diskstream::playlist_modified, this));
 411                 _playlist->LayeringChanged.connect_same_thread (playlist_connections, boost::bind (&Diskstream::playlist_modified, this));
 412                 _playlist->DropReferences.connect_same_thread (playlist_connections, boost::bind (&Diskstream::playlist_deleted, this, boost::weak_ptr<Playlist>(_playlist)));
 413                 _playlist->RangesMoved.connect_same_thread (playlist_connections, boost::bind (&Diskstream::playlist_ranges_moved, this, _1, _2));
 414         }
 415
 416         /* don't do this if we've already asked for it *or* if we are setting up
 417            the diskstream for the very first time - the input changed handling will
 418            take care of the buffer refill.
 419         */
 420
 421         if (!overwrite_queued && prior_playlist) {
 422                 _session.request_overwrite_buffer (_track);
 423                 overwrite_queued = true;
 424         }
 425
 426         PlaylistChanged (); /* EMIT SIGNAL */
 427         _session.set_dirty ();
 428
 429         return 0;
 430 }
 431
 432 void
 433 Diskstream::playlist_changed (const PropertyChange&)
 434 {
 435         playlist_modified ();
 436 }
 437
 438 void
 439 Diskstream::playlist_modified ()
 440 {
 441         if (!i_am_the_modifier && !overwrite_queued) {
 442                 _session.request_overwrite_buffer (_track);
 443                 overwrite_queued = true;
 444         }
 445 }
 446
 447 void
 448 Diskstream::playlist_deleted (boost::weak_ptr<Playlist> wpl)
 449 {
 450         boost::shared_ptr<Playlist> pl (wpl.lock());
 451
 452         if (pl == _playlist) {
 453
 454                 /* this catches an ordering issue with session destruction. playlists
 455                    are destroyed before diskstreams. we have to invalidate any handles
 456                    we have to the playlist.
 457                 */
 458
 459                 if (_playlist) {
 460                         _playlist.reset ();
 461                 }
 462         }
 463 }
 464
 465 bool
 466 Diskstream::set_name (const string& str)
 467 {
 468         if (_name != str) {
 469                 assert(playlist());
 470                 playlist()->set_name (str);
 471                 SessionObject::set_name(str);
 472         }
 473         return true;
 474 }
 475
 476 bool
 477 Diskstream::set_write_source_name (const std::string& str) {
 478         _write_source_name = str;
 479         return true;
 480 }
 481
 482 XMLNode&
 483 Diskstream::get_state ()
 484 {
 485         XMLNode* node = new XMLNode ("Diskstream");
 486         LocaleGuard lg;
 487
 488         node->set_property ("flags", _flags);
 489         node->set_property ("playlist", _playlist->name());
 490         node->set_property ("name", name());
 491         node->set_property ("id", id ());
 492         node->set_property ("speed", _visible_speed);
 493         node->set_property ("capture-alignment", _alignment_choice);
 494         node->set_property ("record-safe", _record_safe);
 495
 496         if (_extra_xml) {
 497                 node->add_child_copy (*_extra_xml);
 498         }
 499         return *node;
 500 }
 501
 502 int
 503 Diskstream::set_state (const XMLNode& node, int /*version*/)
 504 {
 505         std::string name;
 506         if (node.get_property ("name", name)) {
 507                 _name = name;
 508         }
 509
 510         if (deprecated_io_node) {
 511                 set_id (*deprecated_io_node);
 512         } else {
 513                 set_id (node);
 514         }
 515
 516         node.get_property ("flags", _flags);
 517
 518         if (Profile->get_trx() && (_flags & Destructive)) {
 519                 error << string_compose (_("%1: this session uses destructive tracks, which are not supported"), PROGRAM_NAME) << endmsg;
 520                 return -1;
 521         }
 522
 523         AlignChoice achoice = Automatic;
 524         node.get_property (X_("capture-alignment"), achoice);
 525         set_align_choice (achoice, true);
 526
 527         XMLProperty const * prop;
 528
 529         if ((prop = node.property ("playlist")) == 0) {
 530                 return -1;
 531         }
 532
 533         if (find_and_use_playlist (prop->value())) {
 534                 return -1;
 535         }
 536
 537         double sp;
 538         if (node.get_property ("speed", sp)) {
 539                 if (realtime_set_speed (sp, false)) {
 540                         non_realtime_set_speed ();
 541                 }
 542         }
 543
 544         bool record_safe;
 545         if (node.get_property ("record-safe", record_safe)) {
 546           _record_safe = record_safe ? 1 : 0;
 547         }
 548
 549         return 0;
 550 }
 551
 552 void
 553 Diskstream::playlist_ranges_moved (list< Evoral::RangeMove<framepos_t> > const & movements_frames, bool from_undo)
 554 {
 555         /* If we're coming from an undo, it will have handled
 556            automation undo (it must, since automation-follows-regions
 557            can lose automation data).  Hence we can do nothing here.
 558         */
 559
 560         if (from_undo) {
 561                 return;
 562         }
 563
 564         if (!_track || Config->get_automation_follows_regions () == false) {
 565                 return;
 566         }
 567
 568         list< Evoral::RangeMove<double> > movements;
 569
 570         for (list< Evoral::RangeMove<framepos_t> >::const_iterator i = movements_frames.begin();
 571              i != movements_frames.end();
 572              ++i) {
 573
 574                 movements.push_back(Evoral::RangeMove<double>(i->from, i->length, i->to));
 575         }
 576
 577         /* move panner automation */
 578         boost::shared_ptr<Pannable> pannable = _track->pannable();
 579         Evoral::ControlSet::Controls& c (pannable->controls());
 580
 581         for (Evoral::ControlSet::Controls::iterator ci = c.begin(); ci != c.end(); ++ci) {
 582                 boost::shared_ptr<AutomationControl> ac = boost::dynamic_pointer_cast<AutomationControl>(ci->second);
 583                 if (!ac) {
 584                         continue;
 585                 }
 586                 boost::shared_ptr<AutomationList> alist = ac->alist();
 587                 if (!alist->size()) {
 588                         continue;
 589                 }
 590                 XMLNode & before = alist->get_state ();
 591                 bool const things_moved = alist->move_ranges (movements);
 592                 if (things_moved) {
 593                         _session.add_command (new MementoCommand<AutomationList> (
 594                                                       *alist.get(), &before, &alist->get_state ()));
 595                 }
 596         }
 597
 598         /* move processor automation */
 599         _track->foreach_processor (boost::bind (&Diskstream::move_processor_automation, this, _1, movements_frames));
 600 }
 601
 602 void
 603 Diskstream::move_processor_automation (boost::weak_ptr<Processor> p, list< Evoral::RangeMove<framepos_t> > const & movements_frames)
 604 {
 605         boost::shared_ptr<Processor> processor (p.lock ());
 606         if (!processor) {
 607                 return;
 608         }
 609
 610         list< Evoral::RangeMove<double> > movements;
 611         for (list< Evoral::RangeMove<framepos_t> >::const_iterator i = movements_frames.begin(); i != movements_frames.end(); ++i) {
 612                 movements.push_back(Evoral::RangeMove<double>(i->from, i->length, i->to));
 613         }
 614
 615         set<Evoral::Parameter> const a = processor->what_can_be_automated ();
 616
 617         for (set<Evoral::Parameter>::const_iterator i = a.begin (); i != a.end (); ++i) {
 618                 boost::shared_ptr<AutomationList> al = processor->automation_control(*i)->alist();
 619                 if (!al->size()) {
 620                         continue;
 621                 }
 622                 XMLNode & before = al->get_state ();
 623                 bool const things_moved = al->move_ranges (movements);
 624                 if (things_moved) {
 625                         _session.add_command (
 626                                 new MementoCommand<AutomationList> (
 627                                         *al.get(), &before, &al->get_state ()
 628                                         )
 629                                 );
 630                 }
 631         }
 632 }
 633
 634 void
 635 Diskstream::check_record_status (framepos_t transport_frame, bool can_record)
 636 {
 637         int possibly_recording;
 638         int rolling;
 639         int change;
 640         const int transport_rolling = 0x4;
 641         const int track_rec_enabled = 0x2;
 642         const int global_rec_enabled = 0x1;
 643         const int fully_rec_enabled = (transport_rolling|track_rec_enabled|global_rec_enabled);
 644
 645         /* merge together the 3 factors that affect record status, and compute
 646          * what has changed.
 647          */
 648
 649         rolling = _session.transport_speed() != 0.0f;
 650         possibly_recording = (rolling << 2) | ((int)record_enabled() << 1) | (int)can_record;
 651         change = possibly_recording ^ last_possibly_recording;
 652
 653         if (possibly_recording == last_possibly_recording) {
 654                 return;
 655         }
 656
 657         const framecnt_t existing_material_offset = _session.worst_playback_latency();
 658
 659         if (possibly_recording == fully_rec_enabled) {
 660
 661                 if (last_possibly_recording == fully_rec_enabled) {
 662                         return;
 663                 }
 664
 665                 capture_start_frame = _session.transport_frame();
 666                 first_recordable_frame = capture_start_frame + _capture_offset;
 667                 last_recordable_frame = max_framepos;
 668
 669                 DEBUG_TRACE (DEBUG::CaptureAlignment, string_compose ("%1: @ %7 (%9) FRF = %2 CSF = %4 CO = %5, EMO = %6 RD = %8 WOL %10 WTL %11\n",
 670                                                                       name(), first_recordable_frame, last_recordable_frame, capture_start_frame,
 671                                                                       _capture_offset,
 672                                                                       existing_material_offset,
 673                                                                       transport_frame,
 674                                                                       _roll_delay,
 675                                                                       _session.transport_frame(),
 676                                                                       _session.worst_output_latency(),
 677                                                                       _session.worst_track_latency()));
 678
 679
 680                 if (_alignment_style == ExistingMaterial) {
 681                         first_recordable_frame += existing_material_offset;
 682                         DEBUG_TRACE (DEBUG::CaptureAlignment, string_compose ("\tshift FRF by EMO %1\n",
 683                                                                               first_recordable_frame));
 684                 }
 685
 686                 prepare_record_status (capture_start_frame);
 687
 688         } else {
 689
 690                 if (last_possibly_recording == fully_rec_enabled) {
 691
 692                         /* we were recording last time */
 693
 694                         if (change & transport_rolling) {
 695
 696                                 /* transport-change (stopped rolling): last_recordable_frame was set in ::prepare_to_stop(). We
 697                                  * had to set it there because we likely rolled past the stopping point to declick out,
 698                                  * and then backed up.
 699                                  */
 700
 701                         } else {
 702                                 /* punch out */
 703
 704                                 last_recordable_frame = _session.transport_frame() + _capture_offset;
 705
 706                                 if (_alignment_style == ExistingMaterial) {
 707                                         last_recordable_frame += existing_material_offset;
 708                                 }
 709                         }
 710                 }
 711         }
 712
 713         last_possibly_recording = possibly_recording;
 714 }
 715
 716 void
 717 Diskstream::route_going_away ()
 718 {
 719         _io.reset ();
 720 }
 721
 722 void
 723 Diskstream::calculate_record_range (Evoral::OverlapType ot, framepos_t transport_frame, framecnt_t nframes,
 724                                     framecnt_t & rec_nframes, framecnt_t & rec_offset)
 725 {
 726         switch (ot) {
 727         case Evoral::OverlapNone:
 728                 rec_nframes = 0;
 729                 break;
 730
 731         case Evoral::OverlapInternal:
 732                 /*     ----------    recrange
 733                  *       |---|       transrange
 734                  */
 735                 rec_nframes = nframes;
 736                 rec_offset = 0;
 737                 break;
 738
 739         case Evoral::OverlapStart:
 740                 /*    |--------|    recrange
 741                  *  -----|          transrange
 742                  */
 743                 rec_nframes = transport_frame + nframes - first_recordable_frame;
 744                 if (rec_nframes) {
 745                         rec_offset = first_recordable_frame - transport_frame;
 746                 }
 747                 break;
 748
 749         case Evoral::OverlapEnd:
 750                 /*    |--------|    recrange
 751                  *       |--------  transrange
 752                  */
 753                 rec_nframes = last_recordable_frame - transport_frame;
 754                 rec_offset = 0;
 755                 break;
 756
 757         case Evoral::OverlapExternal:
 758                 /*    |--------|    recrange
 759                  *  --------------  transrange
 760                  */
 761                 rec_nframes = last_recordable_frame - first_recordable_frame;
 762                 rec_offset = first_recordable_frame - transport_frame;
 763                 break;
 764         }
 765
 766         DEBUG_TRACE (DEBUG::CaptureAlignment, string_compose ("%1 rec? %2 @ %3 (for %4) FRF %5 LRF %6 : rf %7 @ %8\n",
 767                                                               _name, enum_2_string (ot), transport_frame, nframes,
 768                                                               first_recordable_frame, last_recordable_frame, rec_nframes, rec_offset));
 769 }
 770
 771 void
 772 Diskstream::prepare_to_stop (framepos_t transport_frame, framepos_t audible_frame)
 773 {
 774         switch (_alignment_style) {
 775         case ExistingMaterial:
 776                 last_recordable_frame = transport_frame + _capture_offset;
 777                 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));
 778                 break;
 779
 780         case CaptureTime:
 781                 last_recordable_frame = audible_frame; // note that capture_offset is zero
 782                 /* we may already have captured audio before the last_recordable_frame (audible frame),
 783                    so deal with this.
 784                 */
 785                 if (last_recordable_frame > capture_start_frame) {
 786                         capture_captured = min (capture_captured, last_recordable_frame - capture_start_frame);
 787                 }
 788                 DEBUG_TRACE (DEBUG::CaptureAlignment, string_compose("%1: prepare to stop sets last recordable frame to audible frame @ %2\n", _name, audible_frame));
 789                 break;
 790         }
 791
 792 }
 793
 794 void
 795 Diskstream::engage_record_enable ()
 796 {
 797         g_atomic_int_set (&_record_enabled, 1);
 798 }
 799
 800 void
 801 Diskstream::disengage_record_enable ()
 802 {
 803         g_atomic_int_set (&_record_enabled, 0);
 804 }
 805
 806 void
 807 Diskstream::engage_record_safe ()
 808 {
 809         g_atomic_int_set (&_record_safe, 1);
 810 }
 811
 812 void
 813 Diskstream::disengage_record_safe ()
 814 {
 815         g_atomic_int_set (&_record_safe, 0);
 816 }
 817
 818 framecnt_t
 819 Diskstream::default_disk_read_chunk_frames()
 820 {
 821         return 65536;
 822 }
 823
 824 framecnt_t
 825 Diskstream::default_disk_write_chunk_frames ()
 826 {
 827         return 65536;
 828 }
 829
 830 void
 831 Diskstream::set_buffering_parameters (BufferingPreset bp)
 832 {
 833         framecnt_t read_chunk_size;
 834         framecnt_t read_buffer_size;
 835         framecnt_t write_chunk_size;
 836         framecnt_t write_buffer_size;
 837
 838         if (!get_buffering_presets (bp, read_chunk_size, read_buffer_size, write_chunk_size, write_buffer_size)) {
 839                 return;
 840         }
 841
 842         disk_read_chunk_frames = read_chunk_size;
 843         disk_write_chunk_frames = write_chunk_size;
 844         Config->set_audio_capture_buffer_seconds (write_buffer_size);
 845         Config->set_audio_playback_buffer_seconds (read_buffer_size);
 846
 847         cerr << "Set buffering params to " << disk_read_chunk_frames << '|' << disk_write_chunk_frames << '|'
 848              << Config->get_audio_playback_buffer_seconds() << '|'
 849              << Config->get_audio_capture_buffer_seconds ()
 850              << endl;
 851 }
 852
 853 bool
 854 Diskstream::get_buffering_presets (BufferingPreset bp,
 855                                    framecnt_t& read_chunk_size,
 856                                    framecnt_t& read_buffer_size,
 857                                    framecnt_t& write_chunk_size,
 858                                    framecnt_t& write_buffer_size)
 859 {
 860         switch (bp) {
 861         case Small:
 862                 read_chunk_size = 65536;  /* samples */
 863                 write_chunk_size = 65536; /* samples */
 864                 read_buffer_size = 5;  /* seconds */
 865                 write_buffer_size = 5; /* seconds */
 866                 break;
 867
 868         case Medium:
 869                 read_chunk_size = 262144;  /* samples */
 870                 write_chunk_size = 131072; /* samples */
 871                 read_buffer_size = 10;  /* seconds */
 872                 write_buffer_size = 10; /* seconds */
 873                 break;
 874
 875         case Large:
 876                 read_chunk_size = 524288; /* samples */
 877                 write_chunk_size = 131072; /* samples */
 878                 read_buffer_size = 20; /* seconds */
 879                 write_buffer_size = 20; /* seconds */
 880                 break;
 881
 882         default:
 883                 return false;
 884         }
 885
 886         return true;
 887 }