libs/ardour/audio_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 #include <fstream>
  20 #include <cstdio>
  21 #include <unistd.h>
  22 #include <cmath>
  23 #include <cerrno>
  24 #include <cassert>
  25 #include <string>
  26 #include <climits>
  27 #include <fcntl.h>
  28 #include <cstdlib>
  29 #include <ctime>
  30 #include <sys/stat.h>
  31 #include <sys/mman.h>
  32
  33 #include "pbd/error.h"
  34 #include <glibmm/thread.h>
  35 #include "pbd/xml++.h"
  36 #include "pbd/memento_command.h"
  37 #include "pbd/enumwriter.h"
  38 #include "pbd/stateful_diff_command.h"
  39
  40 #include "ardour/analyser.h"
  41 #include "ardour/ardour.h"
  42 #include "ardour/audio_buffer.h"
  43 #include "ardour/audio_diskstream.h"
  44 #include "ardour/audio_port.h"
  45 #include "ardour/audioengine.h"
  46 #include "ardour/audiofilesource.h"
  47
  48 #include "ardour/audioplaylist.h"
  49 #include "ardour/audioregion.h"
  50 #include "ardour/butler.h"
  51 #include "ardour/configuration.h"
  52 #include "ardour/cycle_timer.h"
  53 #include "ardour/debug.h"
  54 #include "ardour/io.h"
  55 #include "ardour/playlist_factory.h"
  56 #include "ardour/region_factory.h"
  57 #include "ardour/send.h"
  58 #include "ardour/session.h"
  59 #include "ardour/source_factory.h"
  60 #include "ardour/utils.h"
  61 #include "ardour/session_playlists.h"
  62
  63 #include "i18n.h"
  64 #include <locale.h>
  65
  66 using namespace std;
  67 using namespace ARDOUR;
  68 using namespace PBD;
  69
  70 size_t  AudioDiskstream::_working_buffers_size = 0;
  71 Sample* AudioDiskstream::_mixdown_buffer       = 0;
  72 gain_t* AudioDiskstream::_gain_buffer          = 0;
  73
  74 AudioDiskstream::AudioDiskstream (Session &sess, const string &name, Diskstream::Flag flag)
  75         : Diskstream(sess, name, flag)
  76         , deprecated_io_node(NULL)
  77         , channels (new ChannelList)
  78 {
  79         /* prevent any write sources from being created */
  80
  81         in_set_state = true;
  82
  83         init(flag);
  84         use_new_playlist ();
  85
  86         in_set_state = false;
  87 }
  88
  89 AudioDiskstream::AudioDiskstream (Session& sess, const XMLNode& node)
  90         : Diskstream(sess, node)
  91         , deprecated_io_node(NULL)
  92         , channels (new ChannelList)
  93 {
  94         in_set_state = true;
  95         init (Recordable);
  96
  97         if (set_state (node, Stateful::loading_state_version)) {
  98                 in_set_state = false;
  99                 throw failed_constructor();
 100         }
 101
 102         in_set_state = false;
 103
 104         if (destructive()) {
 105                 use_destructive_playlist ();
 106         }
 107 }
 108
 109 void
 110 AudioDiskstream::init (Diskstream::Flag f)
 111 {
 112         Diskstream::init(f);
 113
 114         /* there are no channels at this point, so these
 115            two calls just get speed_buffer_size and wrap_buffer
 116            size setup without duplicating their code.
 117         */
 118
 119         set_block_size (_session.get_block_size());
 120         allocate_temporary_buffers ();
 121
 122         add_channel (1);
 123         assert(_n_channels == ChanCount(DataType::AUDIO, 1));
 124 }
 125
 126 AudioDiskstream::~AudioDiskstream ()
 127 {
 128         DEBUG_TRACE (DEBUG::Destruction, string_compose ("Audio Diskstream %1 destructor\n", _name));
 129
 130         {
 131                 RCUWriter<ChannelList> writer (channels);
 132                 boost::shared_ptr<ChannelList> c = writer.get_copy();
 133
 134                 for (ChannelList::iterator chan = c->begin(); chan != c->end(); ++chan) {
 135                         delete *chan;
 136                 }
 137
 138                 c->clear();
 139         }
 140
 141         channels.flush ();
 142
 143         delete deprecated_io_node;
 144 }
 145
 146 void
 147 AudioDiskstream::allocate_working_buffers()
 148 {
 149         assert(disk_io_frames() > 0);
 150
 151         _working_buffers_size = disk_io_frames();
 152         _mixdown_buffer       = new Sample[_working_buffers_size];
 153         _gain_buffer          = new gain_t[_working_buffers_size];
 154 }
 155
 156 void
 157 AudioDiskstream::free_working_buffers()
 158 {
 159         delete [] _mixdown_buffer;
 160         delete [] _gain_buffer;
 161         _working_buffers_size = 0;
 162         _mixdown_buffer       = 0;
 163         _gain_buffer          = 0;
 164 }
 165
 166 void
 167 AudioDiskstream::non_realtime_input_change ()
 168 {
 169         {
 170                 Glib::Mutex::Lock lm (state_lock);
 171
 172                 if (input_change_pending == NoChange) {
 173                         return;
 174                 }
 175
 176                 {
 177                         RCUWriter<ChannelList> writer (channels);
 178                         boost::shared_ptr<ChannelList> c = writer.get_copy();
 179
 180                         _n_channels.set(DataType::AUDIO, c->size());
 181
 182                         if (_io->n_ports().n_audio() > _n_channels.n_audio()) {
 183                                 add_channel_to (c, _io->n_ports().n_audio() - _n_channels.n_audio());
 184                         } else if (_io->n_ports().n_audio() < _n_channels.n_audio()) {
 185                                 remove_channel_from (c, _n_channels.n_audio() - _io->n_ports().n_audio());
 186                         }
 187                 }
 188
 189                 get_input_sources ();
 190                 set_capture_offset ();
 191
 192                 if (first_input_change) {
 193                         set_align_style (_persistent_alignment_style);
 194                         first_input_change = false;
 195                 } else {
 196                         set_align_style_from_io ();
 197                 }
 198
 199                 input_change_pending = NoChange;
 200
 201                 /* implicit unlock */
 202         }
 203
 204         /* reset capture files */
 205
 206         reset_write_sources (false);
 207
 208         /* now refill channel buffers */
 209
 210         if (speed() != 1.0f || speed() != -1.0f) {
 211                 seek ((nframes_t) (_session.transport_frame() * (double) speed()));
 212         } else {
 213                 seek (_session.transport_frame());
 214         }
 215 }
 216
 217 void
 218 AudioDiskstream::non_realtime_locate (nframes_t location)
 219 {
 220         /* now refill channel buffers */
 221
 222         if (speed() != 1.0f || speed() != -1.0f) {
 223                 seek ((nframes_t) (location * (double) speed()));
 224         } else {
 225                 seek (location);
 226         }
 227 }
 228
 229 void
 230 AudioDiskstream::get_input_sources ()
 231 {
 232         boost::shared_ptr<ChannelList> c = channels.reader();
 233
 234         uint32_t n;
 235         ChannelList::iterator chan;
 236         uint32_t ni = _io->n_ports().n_audio();
 237         vector<string> connections;
 238
 239         for (n = 0, chan = c->begin(); chan != c->end() && n < ni; ++chan, ++n) {
 240
 241                 connections.clear ();
 242
 243                 if (_io->nth (n)->get_connections (connections) == 0) {
 244
 245                         if ((*chan)->source) {
 246                                 // _source->disable_metering ();
 247                         }
 248
 249                         (*chan)->source = 0;
 250
 251                 } else {
 252                         (*chan)->source = dynamic_cast<AudioPort*>(_session.engine().get_port_by_name (connections[0]) );
 253                 }
 254         }
 255 }
 256
 257 int
 258 AudioDiskstream::find_and_use_playlist (const string& name)
 259 {
 260         boost::shared_ptr<AudioPlaylist> playlist;
 261
 262         if ((playlist = boost::dynamic_pointer_cast<AudioPlaylist> (_session.playlists->by_name (name))) == 0) {
 263                 playlist = boost::dynamic_pointer_cast<AudioPlaylist> (PlaylistFactory::create (DataType::AUDIO, _session, name));
 264         }
 265
 266         if (!playlist) {
 267                 error << string_compose(_("AudioDiskstream: Playlist \"%1\" isn't an audio playlist"), name) << endmsg;
 268                 return -1;
 269         }
 270
 271         return use_playlist (playlist);
 272 }
 273
 274 int
 275 AudioDiskstream::use_playlist (boost::shared_ptr<Playlist> playlist)
 276 {
 277         assert(boost::dynamic_pointer_cast<AudioPlaylist>(playlist));
 278
 279         Diskstream::use_playlist(playlist);
 280
 281         return 0;
 282 }
 283
 284 int
 285 AudioDiskstream::use_new_playlist ()
 286 {
 287         string newname;
 288         boost::shared_ptr<AudioPlaylist> playlist;
 289
 290         if (!in_set_state && destructive()) {
 291                 return 0;
 292         }
 293
 294         if (_playlist) {
 295                 newname = Playlist::bump_name (_playlist->name(), _session);
 296         } else {
 297                 newname = Playlist::bump_name (_name, _session);
 298         }
 299
 300         if ((playlist = boost::dynamic_pointer_cast<AudioPlaylist> (PlaylistFactory::create (DataType::AUDIO, _session, newname, hidden()))) != 0) {
 301
 302                 playlist->set_orig_diskstream_id (id());
 303                 return use_playlist (playlist);
 304
 305         } else {
 306                 return -1;
 307         }
 308 }
 309
 310 int
 311 AudioDiskstream::use_copy_playlist ()
 312 {
 313         assert(audio_playlist());
 314
 315         if (destructive()) {
 316                 return 0;
 317         }
 318
 319         if (_playlist == 0) {
 320                 error << string_compose(_("AudioDiskstream %1: there is no existing playlist to make a copy of!"), _name) << endmsg;
 321                 return -1;
 322         }
 323
 324         string newname;
 325         boost::shared_ptr<AudioPlaylist> playlist;
 326
 327         newname = Playlist::bump_name (_playlist->name(), _session);
 328
 329         if ((playlist  = boost::dynamic_pointer_cast<AudioPlaylist>(PlaylistFactory::create (audio_playlist(), newname))) != 0) {
 330                 playlist->set_orig_diskstream_id (id());
 331                 return use_playlist (playlist);
 332         } else {
 333                 return -1;
 334         }
 335 }
 336
 337 void
 338 AudioDiskstream::setup_destructive_playlist ()
 339 {
 340         SourceList srcs;
 341         boost::shared_ptr<ChannelList> c = channels.reader();
 342
 343         for (ChannelList::iterator chan = c->begin(); chan != c->end(); ++chan) {
 344                 srcs.push_back ((*chan)->write_source);
 345         }
 346
 347         /* a single full-sized region */
 348
 349         assert (!srcs.empty ());
 350
 351         PropertyList plist;
 352         plist.add (Properties::name, _name.val());
 353         plist.add (Properties::start, 0);
 354         plist.add (Properties::length, max_frames - max_frames - srcs.front()->natural_position());
 355
 356         boost::shared_ptr<Region> region (RegionFactory::create (srcs, plist));
 357         _playlist->add_region (region, srcs.front()->natural_position());
 358 }
 359
 360 void
 361 AudioDiskstream::use_destructive_playlist ()
 362 {
 363         /* this is called from the XML-based constructor or ::set_destructive. when called,
 364            we already have a playlist and a region, but we need to
 365            set up our sources for write. we use the sources associated
 366            with the (presumed single, full-extent) region.
 367         */
 368
 369         boost::shared_ptr<Region> rp = _playlist->find_next_region (_session.current_start_frame(), Start, 1);
 370
 371         if (!rp) {
 372                 reset_write_sources (false, true);
 373                 return;
 374         }
 375
 376         boost::shared_ptr<AudioRegion> region = boost::dynamic_pointer_cast<AudioRegion> (rp);
 377
 378         if (region == 0) {
 379                 throw failed_constructor();
 380         }
 381
 382         /* be sure to stretch the region out to the maximum length */
 383
 384         region->set_length (max_frames - region->position(), this);
 385
 386         uint32_t n;
 387         ChannelList::iterator chan;
 388         boost::shared_ptr<ChannelList> c = channels.reader();
 389
 390         for (n = 0, chan = c->begin(); chan != c->end(); ++chan, ++n) {
 391                 (*chan)->write_source = boost::dynamic_pointer_cast<AudioFileSource>(region->source (n));
 392                 assert((*chan)->write_source);
 393                 (*chan)->write_source->set_allow_remove_if_empty (false);
 394
 395                 /* this might be false if we switched modes, so force it */
 396
 397                 (*chan)->write_source->set_destructive (true);
 398         }
 399
 400         /* the source list will never be reset for a destructive track */
 401 }
 402
 403 void
 404 AudioDiskstream::prepare_record_status(nframes_t capture_start_frame)
 405 {
 406         if (recordable() && destructive()) {
 407                 boost::shared_ptr<ChannelList> c = channels.reader();
 408                 for (ChannelList::iterator chan = c->begin(); chan != c->end(); ++chan) {
 409
 410                         RingBufferNPT<CaptureTransition>::rw_vector transvec;
 411                         (*chan)->capture_transition_buf->get_write_vector(&transvec);
 412
 413                         if (transvec.len[0] > 0) {
 414                                 transvec.buf[0]->type = CaptureStart;
 415                                 transvec.buf[0]->capture_val = capture_start_frame;
 416                                 (*chan)->capture_transition_buf->increment_write_ptr(1);
 417                         }
 418                         else {
 419                                 // bad!
 420                                 fatal << X_("programming error: capture_transition_buf is full on rec start!  inconceivable!")
 421                                         << endmsg;
 422                         }
 423                 }
 424         }
 425 }
 426
 427 int
 428 AudioDiskstream::process (nframes_t transport_frame, nframes_t nframes, bool can_record, bool rec_monitors_input, bool& need_butler)
 429 {
 430         uint32_t n;
 431         boost::shared_ptr<ChannelList> c = channels.reader();
 432         ChannelList::iterator chan;
 433         int ret = -1;
 434         nframes_t rec_offset = 0;
 435         nframes_t rec_nframes = 0;
 436         bool nominally_recording;
 437         bool re = record_enabled ();
 438         bool collect_playback = false;
 439
 440         playback_distance = 0;
 441
 442         if (!_io || !_io->active()) {
 443                 return 0;
 444         }
 445
 446         check_record_status (transport_frame, nframes, can_record);
 447
 448         nominally_recording = (can_record && re);
 449
 450         if (nframes == 0) {
 451                 return 0;
 452         }
 453
 454         Glib::Mutex::Lock sm (state_lock, Glib::TRY_LOCK);
 455
 456         if (!sm.locked()) {
 457                 return 1;
 458         }
 459
 460         adjust_capture_position = 0;
 461
 462         for (chan = c->begin(); chan != c->end(); ++chan) {
 463                 (*chan)->current_capture_buffer = 0;
 464                 (*chan)->current_playback_buffer = 0;
 465         }
 466
 467         if (nominally_recording || (_session.get_record_enabled() && _session.config.get_punch_in())) {
 468                 // Safeguard against situations where process() goes haywire when autopunching and last_recordable_frame < first_recordable_frame
 469                 if (last_recordable_frame < first_recordable_frame) {
 470                         last_recordable_frame = max_frames;
 471                 }
 472
 473                 OverlapType ot = coverage (first_recordable_frame, last_recordable_frame, transport_frame, transport_frame + nframes);
 474
 475                 calculate_record_range(ot, transport_frame, nframes, rec_nframes, rec_offset);
 476
 477                 if (rec_nframes && !was_recording) {
 478                         capture_captured = 0;
 479                         was_recording = true;
 480                 }
 481         }
 482
 483         if (can_record && !_last_capture_regions.empty()) {
 484                 _last_capture_regions.clear ();
 485         }
 486
 487         if (nominally_recording || rec_nframes) {
 488
 489                 uint32_t limit = _io->n_ports ().n_audio();
 490
 491                 /* one or more ports could already have been removed from _io, but our
 492                    channel setup hasn't yet been updated. prevent us from trying to
 493                    use channels that correspond to missing ports. note that the
 494                    process callback (from which this is called) is always atomic
 495                    with respect to port removal/addition.
 496                 */
 497
 498                 for (n = 0, chan = c->begin(); chan != c->end() && n < limit; ++chan, ++n) {
 499
 500                         ChannelInfo* chaninfo (*chan);
 501
 502                         chaninfo->capture_buf->get_write_vector (&chaninfo->capture_vector);
 503
 504                         if (rec_nframes <= chaninfo->capture_vector.len[0]) {
 505
 506                                 chaninfo->current_capture_buffer = chaninfo->capture_vector.buf[0];
 507
 508                                 /* note: grab the entire port buffer, but only copy what we were supposed to
 509                                    for recording, and use rec_offset
 510                                 */
 511
 512                                 AudioPort* const ap = _io->audio (n);
 513                                 assert(ap);
 514                                 assert(rec_nframes <= ap->get_audio_buffer(nframes).capacity());
 515                                 memcpy (chaninfo->current_capture_buffer, ap->get_audio_buffer (rec_nframes).data(rec_offset), sizeof (Sample) * rec_nframes);
 516
 517
 518                         } else {
 519
 520                                 nframes_t total = chaninfo->capture_vector.len[0] + chaninfo->capture_vector.len[1];
 521
 522                                 if (rec_nframes > total) {
 523                                         DiskOverrun ();
 524                                         goto out;
 525                                 }
 526
 527                                 AudioPort* const ap = _io->audio (n);
 528                                 assert(ap);
 529
 530                                 Sample* buf = ap->get_audio_buffer(nframes).data();
 531                                 nframes_t first = chaninfo->capture_vector.len[0];
 532
 533                                 memcpy (chaninfo->capture_wrap_buffer, buf, sizeof (Sample) * first);
 534                                 memcpy (chaninfo->capture_vector.buf[0], buf, sizeof (Sample) * first);
 535                                 memcpy (chaninfo->capture_wrap_buffer+first, buf + first, sizeof (Sample) * (rec_nframes - first));
 536                                 memcpy (chaninfo->capture_vector.buf[1], buf + first, sizeof (Sample) * (rec_nframes - first));
 537
 538                                 chaninfo->current_capture_buffer = chaninfo->capture_wrap_buffer;
 539                         }
 540                 }
 541
 542         } else {
 543
 544                 if (was_recording) {
 545                         finish_capture (rec_monitors_input, c);
 546                 }
 547
 548         }
 549
 550         if (rec_nframes) {
 551
 552                 /* data will be written to disk */
 553
 554                 if (rec_nframes == nframes && rec_offset == 0) {
 555
 556                         for (chan = c->begin(); chan != c->end(); ++chan) {
 557                                 (*chan)->current_playback_buffer = (*chan)->current_capture_buffer;
 558                         }
 559
 560                         playback_distance = nframes;
 561
 562                 } else {
 563
 564
 565                         /* we can't use the capture buffer as the playback buffer, because
 566                            we recorded only a part of the current process' cycle data
 567                            for capture.
 568                         */
 569
 570                         collect_playback = true;
 571                 }
 572
 573                 adjust_capture_position = rec_nframes;
 574
 575         } else if (nominally_recording) {
 576
 577                 /* can't do actual capture yet - waiting for latency effects to finish before we start*/
 578
 579                 for (chan = c->begin(); chan != c->end(); ++chan) {
 580                         (*chan)->current_playback_buffer = (*chan)->current_capture_buffer;
 581                 }
 582
 583                 playback_distance = nframes;
 584
 585         } else {
 586
 587                 collect_playback = true;
 588         }
 589
 590         if (collect_playback) {
 591
 592                 /* we're doing playback */
 593
 594                 nframes_t necessary_samples;
 595
 596                 /* no varispeed playback if we're recording, because the output .... TBD */
 597
 598                 if (rec_nframes == 0 && _actual_speed != 1.0f) {
 599                         necessary_samples = (nframes_t) floor ((nframes * fabs (_actual_speed))) + 1;
 600                 } else {
 601                         necessary_samples = nframes;
 602                 }
 603
 604                 for (chan = c->begin(); chan != c->end(); ++chan) {
 605                         (*chan)->playback_buf->get_read_vector (&(*chan)->playback_vector);
 606                 }
 607
 608                 n = 0;
 609
 610                 for (chan = c->begin(); chan != c->end(); ++chan, ++n) {
 611
 612                         ChannelInfo* chaninfo (*chan);
 613
 614                         if (necessary_samples <= chaninfo->playback_vector.len[0]) {
 615
 616                                 chaninfo->current_playback_buffer = chaninfo->playback_vector.buf[0];
 617
 618                         } else {
 619                                 nframes_t total = chaninfo->playback_vector.len[0] + chaninfo->playback_vector.len[1];
 620
 621                                 if (necessary_samples > total) {
 622                                         cerr << _name << " Need " << necessary_samples << " total = " << total << endl;
 623                                         cerr << "underrun for " << _name << endl;
 624                                         DiskUnderrun ();
 625                                         goto out;
 626
 627                                 } else {
 628
 629                                         memcpy ((char *) chaninfo->playback_wrap_buffer,
 630                                                         chaninfo->playback_vector.buf[0],
 631                                                         chaninfo->playback_vector.len[0] * sizeof (Sample));
 632                                         memcpy (chaninfo->playback_wrap_buffer + chaninfo->playback_vector.len[0],
 633                                                         chaninfo->playback_vector.buf[1],
 634                                                         (necessary_samples - chaninfo->playback_vector.len[0])
 635                                                                         * sizeof (Sample));
 636
 637                                         chaninfo->current_playback_buffer = chaninfo->playback_wrap_buffer;
 638                                 }
 639                         }
 640                 }
 641
 642                 if (rec_nframes == 0 && _actual_speed != 1.0f && _actual_speed != -1.0f) {
 643                         process_varispeed_playback(nframes, c);
 644                 } else {
 645                         playback_distance = nframes;
 646                 }
 647
 648                 _speed = _target_speed;
 649
 650         }
 651
 652         ret = 0;
 653
 654         if (commit (nframes)) {
 655                 need_butler = true;
 656         }
 657
 658   out:
 659         return ret;
 660 }
 661
 662 void
 663 AudioDiskstream::process_varispeed_playback(nframes_t nframes, boost::shared_ptr<ChannelList> c)
 664 {
 665         ChannelList::iterator chan;
 666
 667         interpolation.set_speed (_target_speed);
 668
 669         int channel = 0;
 670         for (chan = c->begin(); chan != c->end(); ++chan, ++channel) {
 671                 ChannelInfo* chaninfo (*chan);
 672
 673                 playback_distance = interpolation.interpolate (
 674                                 channel, nframes, chaninfo->current_playback_buffer, chaninfo->speed_buffer);
 675
 676                 chaninfo->current_playback_buffer = chaninfo->speed_buffer;
 677         }
 678 }
 679
 680 bool
 681 AudioDiskstream::commit (nframes_t /* nframes */)
 682 {
 683         bool need_butler = false;
 684
 685         if (!_io || !_io->active()) {
 686                 return false;
 687         }
 688
 689         if (_actual_speed < 0.0) {
 690                 playback_sample -= playback_distance;
 691         } else {
 692                 playback_sample += playback_distance;
 693         }
 694
 695         boost::shared_ptr<ChannelList> c = channels.reader();
 696         for (ChannelList::iterator chan = c->begin(); chan != c->end(); ++chan) {
 697
 698                 (*chan)->playback_buf->increment_read_ptr (playback_distance);
 699
 700                 if (adjust_capture_position) {
 701                         (*chan)->capture_buf->increment_write_ptr (adjust_capture_position);
 702                 }
 703         }
 704
 705         if (adjust_capture_position != 0) {
 706                 capture_captured += adjust_capture_position;
 707                 adjust_capture_position = 0;
 708         }
 709
 710         if (_slaved) {
 711                 if (_io && _io->active()) {
 712                         need_butler = c->front()->playback_buf->write_space() >= c->front()->playback_buf->bufsize() / 2;
 713                 } else {
 714                         need_butler = false;
 715                 }
 716         } else {
 717                 if (_io && _io->active()) {
 718                         need_butler = c->front()->playback_buf->write_space() >= disk_io_chunk_frames
 719                                 || c->front()->capture_buf->read_space() >= disk_io_chunk_frames;
 720                 } else {
 721                         need_butler = c->front()->capture_buf->read_space() >= disk_io_chunk_frames;
 722                 }
 723         }
 724
 725         return need_butler;
 726 }
 727
 728 void
 729 AudioDiskstream::set_pending_overwrite (bool yn)
 730 {
 731         /* called from audio thread, so we can use the read ptr and playback sample as we wish */
 732
 733         pending_overwrite = yn;
 734
 735         overwrite_frame = playback_sample;
 736         overwrite_offset = channels.reader()->front()->playback_buf->get_read_ptr();
 737 }
 738
 739 int
 740 AudioDiskstream::overwrite_existing_buffers ()
 741 {
 742         boost::shared_ptr<ChannelList> c = channels.reader();
 743         Sample* mixdown_buffer;
 744         float* gain_buffer;
 745         int ret = -1;
 746         bool reversed = (_visible_speed * _session.transport_speed()) < 0.0f;
 747
 748         overwrite_queued = false;
 749
 750         /* assume all are the same size */
 751         nframes_t size = c->front()->playback_buf->bufsize();
 752
 753         mixdown_buffer = new Sample[size];
 754         gain_buffer = new float[size];
 755
 756         /* reduce size so that we can fill the buffer correctly. */
 757         size--;
 758
 759         uint32_t n=0;
 760         nframes_t start;
 761
 762         for (ChannelList::iterator chan = c->begin(); chan != c->end(); ++chan, ++n) {
 763
 764                 start = overwrite_frame;
 765                 nframes_t cnt = size;
 766
 767                 /* to fill the buffer without resetting the playback sample, we need to
 768                    do it one or two chunks (normally two).
 769
 770                    |----------------------------------------------------------------------|
 771
 772                                        ^
 773                                        overwrite_offset
 774                     |<- second chunk->||<----------------- first chunk ------------------>|
 775
 776                 */
 777
 778                 nframes_t to_read = size - overwrite_offset;
 779
 780                 if (read ((*chan)->playback_buf->buffer() + overwrite_offset, mixdown_buffer, gain_buffer, start, to_read, *chan, n, reversed)) {
 781                         error << string_compose(_("AudioDiskstream %1: when refilling, cannot read %2 from playlist at frame %3"),
 782                                          _id, size, playback_sample) << endmsg;
 783                         goto out;
 784                 }
 785
 786                 if (cnt > to_read) {
 787
 788                         cnt -= to_read;
 789
 790                         if (read ((*chan)->playback_buf->buffer(), mixdown_buffer, gain_buffer,
 791                                   start, cnt, *chan, n, reversed)) {
 792                                 error << string_compose(_("AudioDiskstream %1: when refilling, cannot read %2 from playlist at frame %3"),
 793                                                  _id, size, playback_sample) << endmsg;
 794                                 goto out;
 795                         }
 796                 }
 797         }
 798
 799         ret = 0;
 800
 801   out:
 802         pending_overwrite = false;
 803         delete [] gain_buffer;
 804         delete [] mixdown_buffer;
 805         return ret;
 806 }
 807
 808 int
 809 AudioDiskstream::seek (nframes_t frame, bool complete_refill)
 810 {
 811         uint32_t n;
 812         int ret = -1;
 813         ChannelList::iterator chan;
 814         boost::shared_ptr<ChannelList> c = channels.reader();
 815
 816         Glib::Mutex::Lock lm (state_lock);
 817
 818         for (n = 0, chan = c->begin(); chan != c->end(); ++chan, ++n) {
 819                 (*chan)->playback_buf->reset ();
 820                 (*chan)->capture_buf->reset ();
 821         }
 822
 823         /* can't rec-enable in destructive mode if transport is before start */
 824
 825         if (destructive() && record_enabled() && frame < _session.current_start_frame()) {
 826                 disengage_record_enable ();
 827         }
 828
 829         playback_sample = frame;
 830         file_frame = frame;
 831
 832         if (complete_refill) {
 833                 while ((ret = do_refill_with_alloc ()) > 0) ;
 834         } else {
 835                 ret = do_refill_with_alloc ();
 836         }
 837
 838         return ret;
 839 }
 840
 841 int
 842 AudioDiskstream::can_internal_playback_seek (nframes_t distance)
 843 {
 844         ChannelList::iterator chan;
 845         boost::shared_ptr<ChannelList> c = channels.reader();
 846
 847         for (chan = c->begin(); chan != c->end(); ++chan) {
 848                 if ((*chan)->playback_buf->read_space() < distance) {
 849                         return false;
 850                 }
 851         }
 852         return true;
 853 }
 854
 855 int
 856 AudioDiskstream::internal_playback_seek (nframes_t distance)
 857 {
 858         ChannelList::iterator chan;
 859         boost::shared_ptr<ChannelList> c = channels.reader();
 860
 861         for (chan = c->begin(); chan != c->end(); ++chan) {
 862                 (*chan)->playback_buf->increment_read_ptr (distance);
 863         }
 864
 865         first_recordable_frame += distance;
 866         playback_sample += distance;
 867
 868         return 0;
 869 }
 870
 871 int
 872 AudioDiskstream::read (Sample* buf, Sample* mixdown_buffer, float* gain_buffer, nframes_t& start, nframes_t cnt,
 873                        ChannelInfo* /*channel_info*/, int channel, bool reversed)
 874 {
 875         nframes_t this_read = 0;
 876         bool reloop = false;
 877         nframes_t loop_end = 0;
 878         nframes_t loop_start = 0;
 879         nframes_t offset = 0;
 880         Location *loc = 0;
 881
 882         /* XXX we don't currently play loops in reverse. not sure why */
 883
 884         if (!reversed) {
 885
 886                 nframes_t loop_length = 0;
 887
 888                 /* Make the use of a Location atomic for this read operation.
 889
 890                    Note: Locations don't get deleted, so all we care about
 891                    when I say "atomic" is that we are always pointing to
 892                    the same one and using a start/length values obtained
 893                    just once.
 894                 */
 895
 896                 if ((loc = loop_location) != 0) {
 897                         loop_start = loc->start();
 898                         loop_end = loc->end();
 899                         loop_length = loop_end - loop_start;
 900                 }
 901
 902                 /* if we are looping, ensure that the first frame we read is at the correct
 903                    position within the loop.
 904                 */
 905
 906                 if (loc && start >= loop_end) {
 907                         //cerr << "start adjusted from " << start;
 908                         start = loop_start + ((start - loop_start) % loop_length);
 909                         //cerr << "to " << start << endl;
 910                 }
 911
 912                 //cerr << "start is " << start << "  loopstart: " << loop_start << "  loopend: " << loop_end << endl;
 913         }
 914
 915         while (cnt) {
 916
 917                 if (reversed) {
 918                         start -= cnt;
 919                 }
 920
 921                 /* take any loop into account. we can't read past the end of the loop. */
 922
 923                 if (loc && (loop_end - start < cnt)) {
 924                         this_read = loop_end - start;
 925                         //cerr << "reloop true: thisread: " << this_read << "  cnt: " << cnt << endl;
 926                         reloop = true;
 927                 } else {
 928                         reloop = false;
 929                         this_read = cnt;
 930                 }
 931
 932                 if (this_read == 0) {
 933                         break;
 934                 }
 935
 936                 this_read = min(cnt,this_read);
 937
 938                 if (audio_playlist()->read (buf+offset, mixdown_buffer, gain_buffer, start, this_read, channel) != this_read) {
 939                         error << string_compose(_("AudioDiskstream %1: cannot read %2 from playlist at frame %3"), _id, this_read,
 940                                          start) << endmsg;
 941                         return -1;
 942                 }
 943
 944                 _read_data_count = _playlist->read_data_count();
 945
 946                 if (reversed) {
 947
 948                         swap_by_ptr (buf, buf + this_read - 1);
 949
 950                 } else {
 951
 952                         /* if we read to the end of the loop, go back to the beginning */
 953
 954                         if (reloop) {
 955                                 start = loop_start;
 956                         } else {
 957                                 start += this_read;
 958                         }
 959                 }
 960
 961                 cnt -= this_read;
 962                 offset += this_read;
 963         }
 964
 965         return 0;
 966 }
 967
 968 int
 969 AudioDiskstream::do_refill_with_alloc ()
 970 {
 971         Sample* mix_buf  = new Sample[disk_io_chunk_frames];
 972         float*  gain_buf = new float[disk_io_chunk_frames];
 973
 974         int ret = _do_refill(mix_buf, gain_buf);
 975
 976         delete [] mix_buf;
 977         delete [] gain_buf;
 978
 979         return ret;
 980 }
 981
 982 int
 983 AudioDiskstream::_do_refill (Sample* mixdown_buffer, float* gain_buffer)
 984 {
 985         int32_t ret = 0;
 986         nframes_t to_read;
 987         RingBufferNPT<Sample>::rw_vector vector;
 988         bool reversed = (_visible_speed * _session.transport_speed()) < 0.0f;
 989         nframes_t total_space;
 990         nframes_t zero_fill;
 991         uint32_t chan_n;
 992         ChannelList::iterator i;
 993         boost::shared_ptr<ChannelList> c = channels.reader();
 994         nframes_t ts;
 995
 996         if (c->empty()) {
 997                 return 0;
 998         }
 999
1000         assert(mixdown_buffer);
1001         assert(gain_buffer);
1002
1003         vector.buf[0] = 0;
1004         vector.len[0] = 0;
1005         vector.buf[1] = 0;
1006         vector.len[1] = 0;
1007
1008         c->front()->playback_buf->get_write_vector (&vector);
1009
1010         if ((total_space = vector.len[0] + vector.len[1]) == 0) {
1011                 return 0;
1012         }
1013
1014         /* if there are 2+ chunks of disk i/o possible for
1015            this track, let the caller know so that it can arrange
1016            for us to be called again, ASAP.
1017         */
1018
1019         if (total_space >= (_slaved?3:2) * disk_io_chunk_frames) {
1020                 ret = 1;
1021         }
1022
1023         /* if we're running close to normal speed and there isn't enough
1024            space to do disk_io_chunk_frames of I/O, then don't bother.
1025
1026            at higher speeds, just do it because the sync between butler
1027            and audio thread may not be good enough.
1028         */
1029
1030         if ((total_space < disk_io_chunk_frames) && fabs (_actual_speed) < 2.0f) {
1031                 return 0;
1032         }
1033
1034         /* when slaved, don't try to get too close to the read pointer. this
1035            leaves space for the buffer reversal to have something useful to
1036            work with.
1037         */
1038
1039         if (_slaved && total_space < (c->front()->playback_buf->bufsize() / 2)) {
1040                 return 0;
1041         }
1042
1043         /* never do more than disk_io_chunk_frames worth of disk input per call (limit doesn't apply for memset) */
1044
1045         total_space = min (disk_io_chunk_frames, total_space);
1046
1047         if (reversed) {
1048
1049                 if (file_frame == 0) {
1050
1051                         /* at start: nothing to do but fill with silence */
1052
1053                         for (chan_n = 0, i = c->begin(); i != c->end(); ++i, ++chan_n) {
1054
1055                                 ChannelInfo* chan (*i);
1056                                 chan->playback_buf->get_write_vector (&vector);
1057                                 memset (vector.buf[0], 0, sizeof(Sample) * vector.len[0]);
1058                                 if (vector.len[1]) {
1059                                         memset (vector.buf[1], 0, sizeof(Sample) * vector.len[1]);
1060                                 }
1061                                 chan->playback_buf->increment_write_ptr (vector.len[0] + vector.len[1]);
1062                         }
1063                         return 0;
1064                 }
1065
1066                 if (file_frame < total_space) {
1067
1068                         /* too close to the start: read what we can,
1069                            and then zero fill the rest
1070                         */
1071
1072                         zero_fill = total_space - file_frame;
1073                         total_space = file_frame;
1074                         file_frame = 0;
1075
1076                 } else {
1077
1078                         zero_fill = 0;
1079                 }
1080
1081         } else {
1082
1083                 if (file_frame == max_frames) {
1084
1085                         /* at end: nothing to do but fill with silence */
1086
1087                         for (chan_n = 0, i = c->begin(); i != c->end(); ++i, ++chan_n) {
1088
1089                                 ChannelInfo* chan (*i);
1090                                 chan->playback_buf->get_write_vector (&vector);
1091                                 memset (vector.buf[0], 0, sizeof(Sample) * vector.len[0]);
1092                                 if (vector.len[1]) {
1093                                         memset (vector.buf[1], 0, sizeof(Sample) * vector.len[1]);
1094                                 }
1095                                 chan->playback_buf->increment_write_ptr (vector.len[0] + vector.len[1]);
1096                         }
1097                         return 0;
1098                 }
1099
1100                 if (file_frame > max_frames - total_space) {
1101
1102                         /* to close to the end: read what we can, and zero fill the rest */
1103
1104                         zero_fill = total_space - (max_frames - file_frame);
1105                         total_space = max_frames - file_frame;
1106
1107                 } else {
1108                         zero_fill = 0;
1109                 }
1110         }
1111
1112         nframes_t file_frame_tmp = 0;
1113
1114         for (chan_n = 0, i = c->begin(); i != c->end(); ++i, ++chan_n) {
1115
1116                 ChannelInfo* chan (*i);
1117                 Sample* buf1;
1118                 Sample* buf2;
1119                 nframes_t len1, len2;
1120
1121                 chan->playback_buf->get_write_vector (&vector);
1122
1123                 if (vector.len[0] > disk_io_chunk_frames) {
1124
1125                         /* we're not going to fill the first chunk, so certainly do not bother with the
1126                            other part. it won't be connected with the part we do fill, as in:
1127
1128                            .... => writable space
1129                            ++++ => readable space
1130                            ^^^^ => 1 x disk_io_chunk_frames that would be filled
1131
1132                            |......|+++++++++++++|...............................|
1133                            buf1                buf0
1134                                                 ^^^^^^^^^^^^^^^
1135
1136
1137                            So, just pretend that the buf1 part isn't there.
1138
1139                         */
1140
1141                         vector.buf[1] = 0;
1142                         vector.len[1] = 0;
1143
1144                 }
1145
1146                 ts = total_space;
1147                 file_frame_tmp = file_frame;
1148
1149                 buf1 = vector.buf[0];
1150                 len1 = vector.len[0];
1151                 buf2 = vector.buf[1];
1152                 len2 = vector.len[1];
1153
1154                 to_read = min (ts, len1);
1155                 to_read = min (to_read, disk_io_chunk_frames);
1156
1157                 if (to_read) {
1158
1159                         if (read (buf1, mixdown_buffer, gain_buffer, file_frame_tmp, to_read, chan, chan_n, reversed)) {
1160                                 ret = -1;
1161                                 goto out;
1162                         }
1163
1164                         chan->playback_buf->increment_write_ptr (to_read);
1165                         ts -= to_read;
1166                 }
1167
1168                 to_read = min (ts, len2);
1169
1170                 if (to_read) {
1171
1172                         /* we read all of vector.len[0], but it wasn't an entire disk_io_chunk_frames of data,
1173                            so read some or all of vector.len[1] as well.
1174                         */
1175
1176                         if (read (buf2, mixdown_buffer, gain_buffer, file_frame_tmp, to_read, chan, chan_n, reversed)) {
1177                                 ret = -1;
1178                                 goto out;
1179                         }
1180
1181                         chan->playback_buf->increment_write_ptr (to_read);
1182                 }
1183
1184                 if (zero_fill) {
1185                         /* do something */
1186                 }
1187
1188         }
1189
1190         file_frame = file_frame_tmp;
1191
1192   out:
1193
1194         return ret;
1195 }
1196
1197 /** Flush pending data to disk.
1198  *
1199  * Important note: this function will write *AT MOST* disk_io_chunk_frames
1200  * of data to disk. it will never write more than that.  If it writes that
1201  * much and there is more than that waiting to be written, it will return 1,
1202  * otherwise 0 on success or -1 on failure.
1203  *
1204  * If there is less than disk_io_chunk_frames to be written, no data will be
1205  * written at all unless @a force_flush is true.
1206  */
1207 int
1208 AudioDiskstream::do_flush (RunContext /*context*/, bool force_flush)
1209 {
1210         uint32_t to_write;
1211         int32_t ret = 0;
1212         RingBufferNPT<Sample>::rw_vector vector;
1213         RingBufferNPT<CaptureTransition>::rw_vector transvec;
1214         nframes_t total;
1215
1216         _write_data_count = 0;
1217
1218         transvec.buf[0] = 0;
1219         transvec.buf[1] = 0;
1220         vector.buf[0] = 0;
1221         vector.buf[1] = 0;
1222
1223         boost::shared_ptr<ChannelList> c = channels.reader();
1224         for (ChannelList::iterator chan = c->begin(); chan != c->end(); ++chan) {
1225
1226                 (*chan)->capture_buf->get_read_vector (&vector);
1227
1228                 total = vector.len[0] + vector.len[1];
1229
1230                 if (total == 0 || (total < disk_io_chunk_frames && !force_flush && was_recording)) {
1231                         goto out;
1232                 }
1233
1234                 /* if there are 2+ chunks of disk i/o possible for
1235                    this track, let the caller know so that it can arrange
1236                    for us to be called again, ASAP.
1237
1238                    if we are forcing a flush, then if there is* any* extra
1239                    work, let the caller know.
1240
1241                    if we are no longer recording and there is any extra work,
1242                    let the caller know too.
1243                 */
1244
1245                 if (total >= 2 * disk_io_chunk_frames || ((force_flush || !was_recording) && total > disk_io_chunk_frames)) {
1246                         ret = 1;
1247                 }
1248
1249                 to_write = min (disk_io_chunk_frames, (nframes_t) vector.len[0]);
1250
1251                 // check the transition buffer when recording destructive
1252                 // important that we get this after the capture buf
1253
1254                 if (destructive()) {
1255                         (*chan)->capture_transition_buf->get_read_vector(&transvec);
1256                         size_t transcount = transvec.len[0] + transvec.len[1];
1257                         bool have_start = false;
1258                         size_t ti;
1259
1260                         for (ti=0; ti < transcount; ++ti) {
1261                                 CaptureTransition & captrans = (ti < transvec.len[0]) ? transvec.buf[0][ti] : transvec.buf[1][ti-transvec.len[0]];
1262
1263                                 if (captrans.type == CaptureStart) {
1264                                         // by definition, the first data we got above represents the given capture pos
1265
1266                                         (*chan)->write_source->mark_capture_start (captrans.capture_val);
1267                                         (*chan)->curr_capture_cnt = 0;
1268
1269                                         have_start = true;
1270                                 }
1271                                 else if (captrans.type == CaptureEnd) {
1272
1273                                         // capture end, the capture_val represents total frames in capture
1274
1275                                         if (captrans.capture_val <= (*chan)->curr_capture_cnt + to_write) {
1276
1277                                                 // shorten to make the write a perfect fit
1278                                                 uint32_t nto_write = (captrans.capture_val - (*chan)->curr_capture_cnt);
1279
1280                                                 if (nto_write < to_write) {
1281                                                         ret = 1; // should we?
1282                                                 }
1283                                                 to_write = nto_write;
1284
1285                                                 (*chan)->write_source->mark_capture_end ();
1286
1287                                                 // increment past this transition, but go no further
1288                                                 ++ti;
1289                                                 break;
1290                                         }
1291                                         else {
1292                                                 // actually ends just beyond this chunk, so force more work
1293                                                 ret = 1;
1294                                                 break;
1295                                         }
1296                                 }
1297                         }
1298
1299                         if (ti > 0) {
1300                                 (*chan)->capture_transition_buf->increment_read_ptr(ti);
1301                         }
1302                 }
1303
1304                 if ((!(*chan)->write_source) || (*chan)->write_source->write (vector.buf[0], to_write) != to_write) {
1305                         error << string_compose(_("AudioDiskstream %1: cannot write to disk"), _id) << endmsg;
1306                         return -1;
1307                 }
1308
1309                 (*chan)->capture_buf->increment_read_ptr (to_write);
1310                 (*chan)->curr_capture_cnt += to_write;
1311
1312                 if ((to_write == vector.len[0]) && (total > to_write) && (to_write < disk_io_chunk_frames) && !destructive()) {
1313
1314                         /* we wrote all of vector.len[0] but it wasn't an entire
1315                            disk_io_chunk_frames of data, so arrange for some part
1316                            of vector.len[1] to be flushed to disk as well.
1317                         */
1318
1319                         to_write = min ((nframes_t)(disk_io_chunk_frames - to_write), (nframes_t) vector.len[1]);
1320
1321                         if ((*chan)->write_source->write (vector.buf[1], to_write) != to_write) {
1322                                 error << string_compose(_("AudioDiskstream %1: cannot write to disk"), _id) << endmsg;
1323                                 return -1;
1324                         }
1325
1326                         _write_data_count += (*chan)->write_source->write_data_count();
1327
1328                         (*chan)->capture_buf->increment_read_ptr (to_write);
1329                         (*chan)->curr_capture_cnt += to_write;
1330                 }
1331         }
1332
1333   out:
1334         return ret;
1335 }
1336
1337 void
1338 AudioDiskstream::transport_stopped (struct tm& when, time_t twhen, bool abort_capture)
1339 {
1340         uint32_t buffer_position;
1341         bool more_work = true;
1342         int err = 0;
1343         boost::shared_ptr<AudioRegion> region;
1344         nframes_t total_capture;
1345         SourceList srcs;
1346         SourceList::iterator src;
1347         ChannelList::iterator chan;
1348         vector<CaptureInfo*>::iterator ci;
1349         boost::shared_ptr<ChannelList> c = channels.reader();
1350         uint32_t n = 0;
1351         bool mark_write_completed = false;
1352
1353         finish_capture (true, c);
1354
1355         /* butler is already stopped, but there may be work to do
1356            to flush remaining data to disk.
1357         */
1358
1359         while (more_work && !err) {
1360                 switch (do_flush (TransportContext, true)) {
1361                 case 0:
1362                         more_work = false;
1363                         break;
1364                 case 1:
1365                         break;
1366                 case -1:
1367                         error << string_compose(_("AudioDiskstream \"%1\": cannot flush captured data to disk!"), _name) << endmsg;
1368                         err++;
1369                 }
1370         }
1371
1372         /* XXX is there anything we can do if err != 0 ? */
1373         Glib::Mutex::Lock lm (capture_info_lock);
1374
1375         if (capture_info.empty()) {
1376                 return;
1377         }
1378
1379         if (abort_capture) {
1380
1381                 if (destructive()) {
1382                         goto outout;
1383                 }
1384
1385                 for (ChannelList::iterator chan = c->begin(); chan != c->end(); ++chan) {
1386
1387                         if ((*chan)->write_source) {
1388
1389                                 (*chan)->write_source->mark_for_remove ();
1390                                 (*chan)->write_source->drop_references ();
1391                                 (*chan)->write_source.reset ();
1392                         }
1393
1394                         /* new source set up in "out" below */
1395                 }
1396
1397                 goto out;
1398         }
1399
1400         for (total_capture = 0, ci = capture_info.begin(); ci != capture_info.end(); ++ci) {
1401                 total_capture += (*ci)->frames;
1402         }
1403
1404         /* figure out the name for this take */
1405
1406         for (n = 0, chan = c->begin(); chan != c->end(); ++chan, ++n) {
1407
1408                 boost::shared_ptr<AudioFileSource> s = (*chan)->write_source;
1409
1410                 if (s) {
1411                         srcs.push_back (s);
1412                         s->update_header (capture_info.front()->start, when, twhen);
1413                         s->set_captured_for (_name.val());
1414                         s->mark_immutable ();
1415                         if (Config->get_auto_analyse_audio()) {
1416                                 Analyser::queue_source_for_analysis (s, true);
1417                         }
1418                 }
1419         }
1420
1421         /* destructive tracks have a single, never changing region */
1422
1423         if (destructive()) {
1424
1425                 /* send a signal that any UI can pick up to do the right thing. there is
1426                    a small problem here in that a UI may need the peak data to be ready
1427                    for the data that was recorded and this isn't interlocked with that
1428                    process. this problem is deferred to the UI.
1429                  */
1430
1431                 _playlist->LayeringChanged(); // XXX this may not get the UI to do the right thing
1432
1433         } else {
1434
1435                 string whole_file_region_name;
1436                 whole_file_region_name = region_name_from_path (c->front()->write_source->name(), true);
1437
1438                 /* Register a new region with the Session that
1439                    describes the entire source. Do this first
1440                    so that any sub-regions will obviously be
1441                    children of this one (later!)
1442                 */
1443
1444                 try {
1445                         PropertyList plist;
1446
1447                         plist.add (Properties::start, c->front()->write_source->last_capture_start_frame());
1448                         plist.add (Properties::length, total_capture);
1449                         plist.add (Properties::name, whole_file_region_name);
1450
1451                         boost::shared_ptr<Region> rx (RegionFactory::create (srcs, plist));
1452                         rx->set_automatic (true);
1453                         rx->set_whole_file (true);
1454
1455                         region = boost::dynamic_pointer_cast<AudioRegion> (rx);
1456                         region->special_set_position (capture_info.front()->start);
1457                 }
1458
1459
1460                 catch (failed_constructor& err) {
1461                         error << string_compose(_("%1: could not create region for complete audio file"), _name) << endmsg;
1462                         /* XXX what now? */
1463                 }
1464
1465                 _last_capture_regions.push_back (region);
1466
1467                 // cerr << _name << ": there are " << capture_info.size() << " capture_info records\n";
1468
1469                 _playlist->clear_history ();
1470                 _playlist->freeze ();
1471
1472                 for (buffer_position = c->front()->write_source->last_capture_start_frame(), ci = capture_info.begin(); ci != capture_info.end(); ++ci) {
1473
1474                         string region_name;
1475
1476                         _session.region_name (region_name, whole_file_region_name, false);
1477
1478                         // cerr << _name << ": based on ci of " << (*ci)->start << " for " << (*ci)->frames << " add region " << region_name << endl;
1479
1480                         try {
1481
1482                                 PropertyList plist;
1483
1484                                 plist.add (Properties::start, buffer_position);
1485                                 plist.add (Properties::length, (*ci)->frames);
1486                                 plist.add (Properties::name, region_name);
1487
1488                                 boost::shared_ptr<Region> rx (RegionFactory::create (srcs, plist));
1489                                 region = boost::dynamic_pointer_cast<AudioRegion> (rx);
1490                         }
1491
1492                         catch (failed_constructor& err) {
1493                                 error << _("AudioDiskstream: could not create region for captured audio!") << endmsg;
1494                                 continue; /* XXX is this OK? */
1495                         }
1496
1497                         region->DropReferences.connect_same_thread (*this, boost::bind (&Diskstream::remove_region_from_last_capture, this, boost::weak_ptr<Region>(region)));
1498
1499                         _last_capture_regions.push_back (region);
1500
1501                         i_am_the_modifier++;
1502                         _playlist->add_region (region, (*ci)->start, 1, non_layered());
1503                         i_am_the_modifier--;
1504
1505                         buffer_position += (*ci)->frames;
1506                 }
1507
1508                 _playlist->thaw ();
1509                 _session.add_command (new StatefulDiffCommand (_playlist));
1510         }
1511
1512         mark_write_completed = true;
1513
1514   out:
1515         reset_write_sources (mark_write_completed);
1516
1517   outout:
1518
1519         for (ci = capture_info.begin(); ci != capture_info.end(); ++ci) {
1520                 delete *ci;
1521         }
1522
1523         capture_info.clear ();
1524         capture_start_frame = 0;
1525 }
1526
1527 void
1528 AudioDiskstream::transport_looped (nframes_t transport_frame)
1529 {
1530         if (was_recording) {
1531                 // all we need to do is finish this capture, with modified capture length
1532                 boost::shared_ptr<ChannelList> c = channels.reader();
1533
1534                 // adjust the capture length knowing that the data will be recorded to disk
1535                 // only necessary after the first loop where we're recording
1536                 if (capture_info.size() == 0) {
1537                         capture_captured += _capture_offset;
1538
1539                         if (_alignment_style == ExistingMaterial) {
1540                                 capture_captured += _session.worst_output_latency();
1541                         } else {
1542                                 capture_captured += _roll_delay;
1543                         }
1544                 }
1545
1546                 finish_capture (true, c);
1547
1548                 // the next region will start recording via the normal mechanism
1549                 // we'll set the start position to the current transport pos
1550                 // no latency adjustment or capture offset needs to be made, as that already happened the first time
1551                 capture_start_frame = transport_frame;
1552                 first_recordable_frame = transport_frame; // mild lie
1553                 last_recordable_frame = max_frames;
1554                 was_recording = true;
1555
1556                 if (recordable() && destructive()) {
1557                         for (ChannelList::iterator chan = c->begin(); chan != c->end(); ++chan) {
1558
1559                                 RingBufferNPT<CaptureTransition>::rw_vector transvec;
1560                                 (*chan)->capture_transition_buf->get_write_vector(&transvec);
1561
1562                                 if (transvec.len[0] > 0) {
1563                                         transvec.buf[0]->type = CaptureStart;
1564                                         transvec.buf[0]->capture_val = capture_start_frame;
1565                                         (*chan)->capture_transition_buf->increment_write_ptr(1);
1566                                 }
1567                                 else {
1568                                         // bad!
1569                                         fatal << X_("programming error: capture_transition_buf is full on rec loop!  inconceivable!")
1570                                               << endmsg;
1571                                 }
1572                         }
1573                 }
1574
1575         }
1576 }
1577
1578 void
1579 AudioDiskstream::finish_capture (bool /*rec_monitors_input*/, boost::shared_ptr<ChannelList> c)
1580 {
1581         was_recording = false;
1582
1583         if (capture_captured == 0) {
1584                 return;
1585         }
1586
1587         if (recordable() && destructive()) {
1588                 for (ChannelList::iterator chan = c->begin(); chan != c->end(); ++chan) {
1589
1590                         RingBufferNPT<CaptureTransition>::rw_vector transvec;
1591                         (*chan)->capture_transition_buf->get_write_vector(&transvec);
1592
1593                         if (transvec.len[0] > 0) {
1594                                 transvec.buf[0]->type = CaptureEnd;
1595                                 transvec.buf[0]->capture_val = capture_captured;
1596                                 (*chan)->capture_transition_buf->increment_write_ptr(1);
1597                         }
1598                         else {
1599                                 // bad!
1600                                 fatal << string_compose (_("programmer error: %1"), X_("capture_transition_buf is full when stopping record!  inconceivable!")) << endmsg;
1601                         }
1602                 }
1603         }
1604
1605
1606         CaptureInfo* ci = new CaptureInfo;
1607
1608         ci->start =  capture_start_frame;
1609         ci->frames = capture_captured;
1610
1611         /* XXX theoretical race condition here. Need atomic exchange ?
1612            However, the circumstances when this is called right
1613            now (either on record-disable or transport_stopped)
1614            mean that no actual race exists. I think ...
1615            We now have a capture_info_lock, but it is only to be used
1616            to synchronize in the transport_stop and the capture info
1617            accessors, so that invalidation will not occur (both non-realtime).
1618         */
1619
1620         // cerr << "Finish capture, add new CI, " << ci->start << '+' << ci->frames << endl;
1621
1622         capture_info.push_back (ci);
1623         capture_captured = 0;
1624
1625         /* now we've finished a capture, reset first_recordable_frame for next time */
1626         first_recordable_frame = max_frames;
1627 }
1628
1629 void
1630 AudioDiskstream::set_record_enabled (bool yn)
1631 {
1632         if (!recordable() || !_session.record_enabling_legal() || _io->n_ports().n_audio() == 0) {
1633                 return;
1634         }
1635
1636         /* can't rec-enable in destructive mode if transport is before start */
1637
1638         if (destructive() && yn && _session.transport_frame() < _session.current_start_frame()) {
1639                 return;
1640         }
1641
1642         /* yes, i know that this not proof against race conditions, but its
1643            good enough. i think.
1644         */
1645
1646         if (record_enabled() != yn) {
1647                 if (yn) {
1648                         engage_record_enable ();
1649                 } else {
1650                         disengage_record_enable ();
1651                 }
1652         }
1653 }
1654
1655 void
1656 AudioDiskstream::engage_record_enable ()
1657 {
1658         bool rolling = _session.transport_speed() != 0.0f;
1659         boost::shared_ptr<ChannelList> c = channels.reader();
1660
1661         g_atomic_int_set (&_record_enabled, 1);
1662         capturing_sources.clear ();
1663
1664         if (Config->get_monitoring_model() == HardwareMonitoring) {
1665
1666                 for (ChannelList::iterator chan = c->begin(); chan != c->end(); ++chan) {
1667                         if ((*chan)->source) {
1668                                 (*chan)->source->ensure_monitor_input (!(_session.config.get_auto_input() && rolling));
1669                         }
1670                         capturing_sources.push_back ((*chan)->write_source);
1671                         (*chan)->write_source->mark_streaming_write_started ();
1672                 }
1673
1674         } else {
1675                 for (ChannelList::iterator chan = c->begin(); chan != c->end(); ++chan) {
1676                         capturing_sources.push_back ((*chan)->write_source);
1677                         (*chan)->write_source->mark_streaming_write_started ();
1678                 }
1679         }
1680
1681         RecordEnableChanged (); /* EMIT SIGNAL */
1682 }
1683
1684 void
1685 AudioDiskstream::disengage_record_enable ()
1686 {
1687         g_atomic_int_set (&_record_enabled, 0);
1688         boost::shared_ptr<ChannelList> c = channels.reader();
1689         if (Config->get_monitoring_model() == HardwareMonitoring) {
1690                 for (ChannelList::iterator chan = c->begin(); chan != c->end(); ++chan) {
1691                         if ((*chan)->source) {
1692                                 (*chan)->source->ensure_monitor_input (false);
1693                         }
1694                 }
1695         }
1696         capturing_sources.clear ();
1697         RecordEnableChanged (); /* EMIT SIGNAL */
1698 }
1699
1700 XMLNode&
1701 AudioDiskstream::get_state ()
1702 {
1703         XMLNode* node = new XMLNode ("AudioDiskstream");
1704         char buf[64] = "";
1705         LocaleGuard lg (X_("POSIX"));
1706         boost::shared_ptr<ChannelList> c = channels.reader();
1707
1708         node->add_property ("flags", enum_2_string (_flags));
1709
1710         snprintf (buf, sizeof(buf), "%zd", c->size());
1711         node->add_property ("channels", buf);
1712
1713         node->add_property ("playlist", _playlist->name());
1714
1715         snprintf (buf, sizeof(buf), "%.12g", _visible_speed);
1716         node->add_property ("speed", buf);
1717
1718         node->add_property("name", _name);
1719         id().print (buf, sizeof (buf));
1720         node->add_property("id", buf);
1721
1722         if (!capturing_sources.empty() && _session.get_record_enabled()) {
1723
1724                 XMLNode* cs_child = new XMLNode (X_("CapturingSources"));
1725                 XMLNode* cs_grandchild;
1726
1727                 for (vector<boost::shared_ptr<AudioFileSource> >::iterator i = capturing_sources.begin(); i != capturing_sources.end(); ++i) {
1728                         cs_grandchild = new XMLNode (X_("file"));
1729                         cs_grandchild->add_property (X_("path"), (*i)->path());
1730                         cs_child->add_child_nocopy (*cs_grandchild);
1731                 }
1732
1733                 /* store the location where capture will start */
1734
1735                 Location* pi;
1736
1737                 if (_session.config.get_punch_in() && ((pi = _session.locations()->auto_punch_location()) != 0)) {
1738                         snprintf (buf, sizeof (buf), "%" PRId64, pi->start());
1739                 } else {
1740                         snprintf (buf, sizeof (buf), "%" PRId64, _session.transport_frame());
1741                 }
1742
1743                 cs_child->add_property (X_("at"), buf);
1744                 node->add_child_nocopy (*cs_child);
1745         }
1746
1747         if (_extra_xml) {
1748                 node->add_child_copy (*_extra_xml);
1749         }
1750
1751         return* node;
1752 }
1753
1754 int
1755 AudioDiskstream::set_state (const XMLNode& node, int /*version*/)
1756 {
1757         const XMLProperty* prop;
1758         XMLNodeList nlist = node.children();
1759         XMLNodeIterator niter;
1760         uint32_t nchans = 1;
1761         XMLNode* capture_pending_node = 0;
1762         LocaleGuard lg (X_("POSIX"));
1763
1764         in_set_state = true;
1765
1766         for (niter = nlist.begin(); niter != nlist.end(); ++niter) {
1767                 if ((*niter)->name() == IO::state_node_name) {
1768                         deprecated_io_node = new XMLNode (**niter);
1769                 }
1770
1771                 if ((*niter)->name() == X_("CapturingSources")) {
1772                         capture_pending_node = *niter;
1773                 }
1774         }
1775
1776         /* prevent write sources from being created */
1777
1778         in_set_state = true;
1779
1780         if ((prop = node.property ("name")) != 0) {
1781                 _name = prop->value();
1782         }
1783
1784         if (deprecated_io_node) {
1785                 if ((prop = deprecated_io_node->property ("id")) != 0) {
1786                         _id = prop->value ();
1787                 }
1788         } else {
1789                 if ((prop = node.property ("id")) != 0) {
1790                         _id = prop->value ();
1791                 }
1792         }
1793
1794         if ((prop = node.property ("flags")) != 0) {
1795                 _flags = Flag (string_2_enum (prop->value(), _flags));
1796         }
1797
1798         if ((prop = node.property ("channels")) != 0) {
1799                 nchans = atoi (prop->value().c_str());
1800         }
1801
1802         // create necessary extra channels
1803         // we are always constructed with one and we always need one
1804
1805         _n_channels.set(DataType::AUDIO, channels.reader()->size());
1806
1807         if (nchans > _n_channels.n_audio()) {
1808
1809                 add_channel (nchans - _n_channels.n_audio());
1810                 IO::PortCountChanged(_n_channels);
1811
1812         } else if (nchans < _n_channels.n_audio()) {
1813
1814                 remove_channel (_n_channels.n_audio() - nchans);
1815         }
1816
1817         if ((prop = node.property ("playlist")) == 0) {
1818                 return -1;
1819         }
1820
1821         {
1822                 bool had_playlist = (_playlist != 0);
1823
1824                 if (find_and_use_playlist (prop->value())) {
1825                         return -1;
1826                 }
1827
1828                 if (!had_playlist) {
1829                         _playlist->set_orig_diskstream_id (_id);
1830                 }
1831
1832                 if (!destructive() && capture_pending_node) {
1833                         /* destructive streams have one and only one source per channel,
1834                            and so they never end up in pending capture in any useful
1835                            sense.
1836                         */
1837                         use_pending_capture_data (*capture_pending_node);
1838                 }
1839
1840         }
1841
1842         if ((prop = node.property ("speed")) != 0) {
1843                 double sp = atof (prop->value().c_str());
1844
1845                 if (realtime_set_speed (sp, false)) {
1846                         non_realtime_set_speed ();
1847                 }
1848         }
1849
1850         in_set_state = false;
1851
1852         /* make sure this is clear before we do anything else */
1853
1854         capturing_sources.clear ();
1855
1856         /* write sources are handled when we handle the input set
1857            up of the IO that owns this DS (::non_realtime_input_change())
1858         */
1859
1860         return 0;
1861 }
1862
1863 int
1864 AudioDiskstream::use_new_write_source (uint32_t n)
1865 {
1866         boost::shared_ptr<ChannelList> c = channels.reader();
1867
1868         if (!recordable()) {
1869                 return 1;
1870         }
1871
1872         if (n >= c->size()) {
1873                 error << string_compose (_("AudioDiskstream: channel %1 out of range"), n) << endmsg;
1874                 return -1;
1875         }
1876
1877         ChannelInfo* chan = (*c)[n];
1878
1879         if (chan->write_source) {
1880                 chan->write_source->done_with_peakfile_writes ();
1881                 chan->write_source->set_allow_remove_if_empty (true);
1882                 chan->write_source.reset ();
1883         }
1884
1885         try {
1886                 if ((chan->write_source = _session.create_audio_source_for_session (*this, n, destructive())) == 0) {
1887                         throw failed_constructor();
1888                 }
1889         }
1890
1891         catch (failed_constructor &err) {
1892                 error << string_compose (_("%1:%2 new capture file not initialized correctly"), _name, n) << endmsg;
1893                 chan->write_source.reset ();
1894                 return -1;
1895         }
1896
1897         /* do not remove destructive files even if they are empty */
1898
1899         chan->write_source->set_allow_remove_if_empty (!destructive());
1900
1901         /* until we write, this file is considered removable */
1902
1903         chan->write_source->mark_for_remove ();
1904
1905         return 0;
1906 }
1907
1908 void
1909 AudioDiskstream::reset_write_sources (bool mark_write_complete, bool /*force*/)
1910 {
1911         ChannelList::iterator chan;
1912         boost::shared_ptr<ChannelList> c = channels.reader();
1913         uint32_t n;
1914
1915         if (!_session.writable() || !recordable()) {
1916                 return;
1917         }
1918
1919         capturing_sources.clear ();
1920
1921         for (chan = c->begin(), n = 0; chan != c->end(); ++chan, ++n) {
1922                 if (!destructive()) {
1923
1924                         if ((*chan)->write_source && mark_write_complete) {
1925                                 (*chan)->write_source->mark_streaming_write_completed ();
1926                         }
1927                         use_new_write_source (n);
1928
1929                         if (record_enabled()) {
1930                                 capturing_sources.push_back ((*chan)->write_source);
1931                         }
1932
1933                 } else {
1934                         if ((*chan)->write_source == 0) {
1935                                 use_new_write_source (n);
1936                         }
1937                 }
1938         }
1939
1940         if (destructive() && !c->empty ()) {
1941
1942                 /* we now have all our write sources set up, so create the
1943                    playlist's single region.
1944                 */
1945
1946                 if (_playlist->empty()) {
1947                         setup_destructive_playlist ();
1948                 }
1949         }
1950 }
1951
1952 int
1953 AudioDiskstream::rename_write_sources ()
1954 {
1955         ChannelList::iterator chan;
1956         boost::shared_ptr<ChannelList> c = channels.reader();
1957         uint32_t n;
1958
1959         for (chan = c->begin(), n = 0; chan != c->end(); ++chan, ++n) {
1960                 if ((*chan)->write_source != 0) {
1961                         (*chan)->write_source->set_source_name (_name.val(), destructive());
1962                         /* XXX what to do if one of them fails ? */
1963                 }
1964         }
1965
1966         return 0;
1967 }
1968
1969 void
1970 AudioDiskstream::set_block_size (nframes_t /*nframes*/)
1971 {
1972         if (_session.get_block_size() > speed_buffer_size) {
1973                 speed_buffer_size = _session.get_block_size();
1974                 boost::shared_ptr<ChannelList> c = channels.reader();
1975
1976                 for (ChannelList::iterator chan = c->begin(); chan != c->end(); ++chan) {
1977                         if ((*chan)->speed_buffer)
1978                                 delete [] (*chan)->speed_buffer;
1979                         (*chan)->speed_buffer = new Sample[speed_buffer_size];
1980                 }
1981         }
1982         allocate_temporary_buffers ();
1983 }
1984
1985 void
1986 AudioDiskstream::allocate_temporary_buffers ()
1987 {
1988         /* make sure the wrap buffer is at least large enough to deal
1989            with the speeds up to 1.2, to allow for micro-variation
1990            when slaving to MTC, Timecode etc.
1991         */
1992
1993         double sp = max (fabsf (_actual_speed), 1.2f);
1994         nframes_t required_wrap_size = (nframes_t) floor (_session.get_block_size() * sp) + 1;
1995
1996         if (required_wrap_size > wrap_buffer_size) {
1997
1998                 boost::shared_ptr<ChannelList> c = channels.reader();
1999
2000                 for (ChannelList::iterator chan = c->begin(); chan != c->end(); ++chan) {
2001                         if ((*chan)->playback_wrap_buffer)
2002                                 delete [] (*chan)->playback_wrap_buffer;
2003                         (*chan)->playback_wrap_buffer = new Sample[required_wrap_size];
2004                         if ((*chan)->capture_wrap_buffer)
2005                                 delete [] (*chan)->capture_wrap_buffer;
2006                         (*chan)->capture_wrap_buffer = new Sample[required_wrap_size];
2007                 }
2008
2009                 wrap_buffer_size = required_wrap_size;
2010         }
2011 }
2012
2013 void
2014 AudioDiskstream::monitor_input (bool yn)
2015 {
2016         boost::shared_ptr<ChannelList> c = channels.reader();
2017
2018         for (ChannelList::iterator chan = c->begin(); chan != c->end(); ++chan) {
2019
2020                 if ((*chan)->source) {
2021                         (*chan)->source->ensure_monitor_input (yn);
2022                 }
2023         }
2024 }
2025
2026 void
2027 AudioDiskstream::set_align_style_from_io ()
2028 {
2029         bool have_physical = false;
2030
2031         if (_io == 0) {
2032                 return;
2033         }
2034
2035         get_input_sources ();
2036
2037         boost::shared_ptr<ChannelList> c = channels.reader();
2038
2039         for (ChannelList::iterator chan = c->begin(); chan != c->end(); ++chan) {
2040                 if ((*chan)->source && (*chan)->source->flags() & JackPortIsPhysical) {
2041                         have_physical = true;
2042                         break;
2043                 }
2044         }
2045
2046         if (have_physical) {
2047                 set_align_style (ExistingMaterial);
2048         } else {
2049                 set_align_style (CaptureTime);
2050         }
2051 }
2052
2053 int
2054 AudioDiskstream::add_channel_to (boost::shared_ptr<ChannelList> c, uint32_t how_many)
2055 {
2056         while (how_many--) {
2057                 c->push_back (new ChannelInfo(_session.butler()->audio_diskstream_buffer_size(), speed_buffer_size, wrap_buffer_size));
2058                 interpolation.add_channel_to (_session.butler()->audio_diskstream_buffer_size(), speed_buffer_size);
2059         }
2060
2061         _n_channels.set(DataType::AUDIO, c->size());
2062
2063         return 0;
2064 }
2065
2066 int
2067 AudioDiskstream::add_channel (uint32_t how_many)
2068 {
2069         RCUWriter<ChannelList> writer (channels);
2070         boost::shared_ptr<ChannelList> c = writer.get_copy();
2071
2072         return add_channel_to (c, how_many);
2073 }
2074
2075 int
2076 AudioDiskstream::remove_channel_from (boost::shared_ptr<ChannelList> c, uint32_t how_many)
2077 {
2078         while (how_many-- && !c->empty()) {
2079                 // FIXME: crash (thread safe with RCU?)
2080                 // memory leak, when disabled.... :(
2081                 //delete c->back();
2082                 c->pop_back();
2083                 interpolation.remove_channel_from ();
2084         }
2085
2086         _n_channels.set(DataType::AUDIO, c->size());
2087
2088         return 0;
2089 }
2090
2091 int
2092 AudioDiskstream::remove_channel (uint32_t how_many)
2093 {
2094         RCUWriter<ChannelList> writer (channels);
2095         boost::shared_ptr<ChannelList> c = writer.get_copy();
2096
2097         return remove_channel_from (c, how_many);
2098 }
2099
2100 float
2101 AudioDiskstream::playback_buffer_load () const
2102 {
2103         boost::shared_ptr<ChannelList> c = channels.reader();
2104
2105         return (float) ((double) c->front()->playback_buf->read_space()/
2106                         (double) c->front()->playback_buf->bufsize());
2107 }
2108
2109 float
2110 AudioDiskstream::capture_buffer_load () const
2111 {
2112         boost::shared_ptr<ChannelList> c = channels.reader();
2113
2114         return (float) ((double) c->front()->capture_buf->write_space()/
2115                         (double) c->front()->capture_buf->bufsize());
2116 }
2117
2118 int
2119 AudioDiskstream::use_pending_capture_data (XMLNode& node)
2120 {
2121         const XMLProperty* prop;
2122         XMLNodeList nlist = node.children();
2123         XMLNodeIterator niter;
2124         boost::shared_ptr<AudioFileSource> fs;
2125         boost::shared_ptr<AudioFileSource> first_fs;
2126         SourceList pending_sources;
2127         nframes_t position;
2128
2129         if ((prop = node.property (X_("at"))) == 0) {
2130                 return -1;
2131         }
2132
2133         if (sscanf (prop->value().c_str(), "%" PRIu32, &position) != 1) {
2134                 return -1;
2135         }
2136
2137         for (niter = nlist.begin(); niter != nlist.end(); ++niter) {
2138                 if ((*niter)->name() == X_("file")) {
2139
2140                         if ((prop = (*niter)->property (X_("path"))) == 0) {
2141                                 continue;
2142                         }
2143
2144                         // This protects sessions from errant CapturingSources in stored sessions
2145                         struct stat sbuf;
2146                         if (stat (prop->value().c_str(), &sbuf)) {
2147                                 continue;
2148                         }
2149
2150                         try {
2151                                 fs = boost::dynamic_pointer_cast<AudioFileSource> (
2152                                                 SourceFactory::createWritable (DataType::AUDIO, _session,
2153                                                                 prop->value(), false, _session.frame_rate()));
2154                         }
2155
2156                         catch (failed_constructor& err) {
2157                                 error << string_compose (_("%1: cannot restore pending capture source file %2"),
2158                                                   _name, prop->value())
2159                                       << endmsg;
2160                                 return -1;
2161                         }
2162
2163                         pending_sources.push_back (fs);
2164
2165                         if (first_fs == 0) {
2166                                 first_fs = fs;
2167                         }
2168
2169                         fs->set_captured_for (_name.val());
2170                 }
2171         }
2172
2173         if (pending_sources.size() == 0) {
2174                 /* nothing can be done */
2175                 return 1;
2176         }
2177
2178         if (pending_sources.size() != _n_channels.n_audio()) {
2179                 error << string_compose (_("%1: incorrect number of pending sources listed - ignoring them all"), _name)
2180                       << endmsg;
2181                 return -1;
2182         }
2183
2184         boost::shared_ptr<AudioRegion> region;
2185
2186         try {
2187
2188                 PropertyList plist;
2189
2190                 plist.add (Properties::start, 0);
2191                 plist.add (Properties::length, first_fs->length (first_fs->timeline_position()));
2192                 plist.add (Properties::name, region_name_from_path (first_fs->name(), true));
2193
2194                 region = boost::dynamic_pointer_cast<AudioRegion> (RegionFactory::create (pending_sources, plist));
2195
2196                 region->set_automatic (true);
2197                 region->set_whole_file (true);
2198                 region->special_set_position (0);
2199         }
2200
2201         catch (failed_constructor& err) {
2202                 error << string_compose (
2203                                 _("%1: cannot create whole-file region from pending capture sources"),
2204                                 _name) << endmsg;
2205
2206                 return -1;
2207         }
2208
2209         _playlist->add_region (region, position);
2210
2211         return 0;
2212 }
2213
2214 int
2215 AudioDiskstream::set_non_layered (bool yn)
2216 {
2217         if (yn != non_layered()) {
2218
2219                 if (yn) {
2220                         _flags = Flag (_flags | NonLayered);
2221                 } else {
2222                         _flags = Flag (_flags & ~NonLayered);
2223                 }
2224         }
2225
2226         return 0;
2227 }
2228
2229 int
2230 AudioDiskstream::set_destructive (bool yn)
2231 {
2232         if (yn != destructive()) {
2233
2234                 if (yn) {
2235                         bool bounce_ignored;
2236                         /* requestor should already have checked this and
2237                            bounced if necessary and desired
2238                         */
2239                         if (!can_become_destructive (bounce_ignored)) {
2240                                 return -1;
2241                         }
2242                         _flags = Flag (_flags | Destructive);
2243                         use_destructive_playlist ();
2244                 } else {
2245                         _flags = Flag (_flags & ~Destructive);
2246                         reset_write_sources (true, true);
2247                 }
2248         }
2249
2250         return 0;
2251 }
2252
2253 bool
2254 AudioDiskstream::can_become_destructive (bool& requires_bounce) const
2255 {
2256         if (!_playlist) {
2257                 requires_bounce = false;
2258                 return false;
2259         }
2260
2261         /* is there only one region ? */
2262
2263         if (_playlist->n_regions() != 1) {
2264                 requires_bounce = true;
2265                 return false;
2266         }
2267
2268         boost::shared_ptr<Region> first = _playlist->find_next_region (_session.current_start_frame(), Start, 1);
2269         if (!first) {
2270                 requires_bounce = false;
2271                 return true;
2272         }
2273
2274         /* do the source(s) for the region cover the session start position ? */
2275
2276         if (first->position() != _session.current_start_frame()) {
2277                 if (first->start() > _session.current_start_frame()) {
2278                         requires_bounce = true;
2279                         return false;
2280                 }
2281         }
2282
2283         /* is the source used by only 1 playlist ? */
2284
2285         boost::shared_ptr<AudioRegion> afirst = boost::dynamic_pointer_cast<AudioRegion> (first);
2286
2287         assert (afirst);
2288
2289         if (_session.playlists->source_use_count (afirst->source()) > 1) {
2290                 requires_bounce = true;
2291                 return false;
2292         }
2293
2294         requires_bounce = false;
2295         return true;
2296 }
2297
2298 AudioDiskstream::ChannelInfo::ChannelInfo (nframes_t bufsize, nframes_t speed_size, nframes_t wrap_size)
2299 {
2300         peak_power = 0.0f;
2301         source = 0;
2302         current_capture_buffer = 0;
2303         current_playback_buffer = 0;
2304         curr_capture_cnt = 0;
2305
2306         speed_buffer = new Sample[speed_size];
2307         playback_wrap_buffer = new Sample[wrap_size];
2308         capture_wrap_buffer = new Sample[wrap_size];
2309
2310         playback_buf = new RingBufferNPT<Sample> (bufsize);
2311         capture_buf = new RingBufferNPT<Sample> (bufsize);
2312         capture_transition_buf = new RingBufferNPT<CaptureTransition> (256);
2313
2314         /* touch the ringbuffer buffers, which will cause
2315            them to be mapped into locked physical RAM if
2316            we're running with mlockall(). this doesn't do
2317            much if we're not.
2318         */
2319
2320         memset (playback_buf->buffer(), 0, sizeof (Sample) * playback_buf->bufsize());
2321         memset (capture_buf->buffer(), 0, sizeof (Sample) * capture_buf->bufsize());
2322         memset (capture_transition_buf->buffer(), 0, sizeof (CaptureTransition) * capture_transition_buf->bufsize());
2323 }
2324
2325 AudioDiskstream::ChannelInfo::~ChannelInfo ()
2326 {
2327         if (write_source) {
2328                 write_source.reset ();
2329         }
2330
2331         delete [] speed_buffer;
2332         speed_buffer = 0;
2333
2334         delete [] playback_wrap_buffer;
2335         playback_wrap_buffer = 0;
2336
2337         delete [] capture_wrap_buffer;
2338         capture_wrap_buffer = 0;
2339
2340         delete playback_buf;
2341         playback_buf = 0;
2342
2343         delete capture_buf;
2344         capture_buf = 0;
2345
2346         delete capture_transition_buf;
2347         capture_transition_buf = 0;
2348 }