libs/ardour/audio_playlist.cc

   1 /*
   2     Copyright (C) 2003 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 <algorithm>
  21
  22 #include <cstdlib>
  23
  24
  25 #include "ardour/types.h"
  26 #include "ardour/debug.h"
  27 #include "ardour/configuration.h"
  28 #include "ardour/audioplaylist.h"
  29 #include "ardour/audioregion.h"
  30 #include "ardour/crossfade.h"
  31 #include "ardour/crossfade_compare.h"
  32 #include "ardour/session.h"
  33 #include "pbd/enumwriter.h"
  34
  35 #include "i18n.h"
  36
  37 using namespace ARDOUR;
  38 using namespace std;
  39 using namespace PBD;
  40
  41 AudioPlaylist::AudioPlaylist (Session& session, const XMLNode& node, bool hidden)
  42         : Playlist (session, node, DataType::AUDIO, hidden)
  43 {
  44 #ifndef NDEBUG
  45         const XMLProperty* prop = node.property("type");
  46         assert(!prop || DataType(prop->value()) == DataType::AUDIO);
  47 #endif
  48
  49         in_set_state++;
  50         set_state (node, Stateful::loading_state_version);
  51         in_set_state--;
  52 }
  53
  54 AudioPlaylist::AudioPlaylist (Session& session, string name, bool hidden)
  55         : Playlist (session, name, DataType::AUDIO, hidden)
  56 {
  57 }
  58
  59 AudioPlaylist::AudioPlaylist (boost::shared_ptr<const AudioPlaylist> other, string name, bool hidden)
  60         : Playlist (other, name, hidden)
  61 {
  62         RegionList::const_iterator in_o  = other->regions.begin();
  63         RegionList::iterator in_n = regions.begin();
  64
  65         while (in_o != other->regions.end()) {
  66                 boost::shared_ptr<AudioRegion> ar = boost::dynamic_pointer_cast<AudioRegion>(*in_o);
  67
  68                 // We look only for crossfades which begin with the current region, so we don't get doubles
  69                 for (Crossfades::const_iterator xfades = other->_crossfades.begin(); xfades != other->_crossfades.end(); ++xfades) {
  70                         if ((*xfades)->in() == ar) {
  71                                 // We found one! Now copy it!
  72
  73                                 RegionList::const_iterator out_o = other->regions.begin();
  74                                 RegionList::const_iterator out_n = regions.begin();
  75
  76                                 while (out_o != other->regions.end()) {
  77
  78                                         boost::shared_ptr<AudioRegion>ar2 = boost::dynamic_pointer_cast<AudioRegion>(*out_o);
  79
  80                                         if ((*xfades)->out() == ar2) {
  81                                                 boost::shared_ptr<AudioRegion>in  = boost::dynamic_pointer_cast<AudioRegion>(*in_n);
  82                                                 boost::shared_ptr<AudioRegion>out = boost::dynamic_pointer_cast<AudioRegion>(*out_n);
  83                                                 boost::shared_ptr<Crossfade> new_fade = boost::shared_ptr<Crossfade> (new Crossfade (*xfades, in, out));
  84                                                 add_crossfade(new_fade);
  85                                                 break;
  86                                         }
  87
  88                                         out_o++;
  89                                         out_n++;
  90                                 }
  91 //                              cerr << "HUH!? second region in the crossfade not found!" << endl;
  92                         }
  93                 }
  94
  95                 in_o++;
  96                 in_n++;
  97         }
  98 }
  99
 100 AudioPlaylist::AudioPlaylist (boost::shared_ptr<const AudioPlaylist> other, nframes_t start, nframes_t cnt, string name, bool hidden)
 101         : Playlist (other, start, cnt, name, hidden)
 102 {
 103         /* this constructor does NOT notify others (session) */
 104 }
 105
 106 AudioPlaylist::~AudioPlaylist ()
 107 {
 108         _crossfades.clear ();
 109 }
 110
 111 struct RegionSortByLayer {
 112     bool operator() (boost::shared_ptr<Region> a, boost::shared_ptr<Region> b) {
 113             return a->layer() < b->layer();
 114     }
 115 };
 116
 117 ARDOUR::nframes_t
 118 AudioPlaylist::read (Sample *buf, Sample *mixdown_buffer, float *gain_buffer, nframes_t start,
 119                      nframes_t cnt, unsigned chan_n)
 120 {
 121         nframes_t ret = cnt;
 122         nframes_t end;
 123         nframes_t read_frames;
 124         nframes_t skip_frames;
 125
 126         /* optimizing this memset() away involves a lot of conditionals
 127            that may well cause more of a hit due to cache misses
 128            and related stuff than just doing this here.
 129
 130            it would be great if someone could measure this
 131            at some point.
 132
 133            one way or another, parts of the requested area
 134            that are not written to by Region::region_at()
 135            for all Regions that cover the area need to be
 136            zeroed.
 137         */
 138
 139         memset (buf, 0, sizeof (Sample) * cnt);
 140
 141         /* this function is never called from a realtime thread, so
 142            its OK to block (for short intervals).
 143         */
 144
 145         Glib::RecMutex::Lock rm (region_lock);
 146
 147         end =  start + cnt - 1;
 148         read_frames = 0;
 149         skip_frames = 0;
 150         _read_data_count = 0;
 151
 152         _read_data_count = 0;
 153
 154         RegionList* rlist = regions_to_read (start, start+cnt);
 155
 156         if (rlist->empty()) {
 157                 delete rlist;
 158                 return cnt;
 159         }
 160
 161         map<uint32_t,vector<boost::shared_ptr<Region> > > relevant_regions;
 162         map<uint32_t,vector<boost::shared_ptr<Crossfade> > > relevant_xfades;
 163         vector<uint32_t> relevant_layers;
 164
 165         for (RegionList::iterator i = rlist->begin(); i != rlist->end(); ++i) {
 166                 if ((*i)->coverage (start, end) != OverlapNone) {
 167                         relevant_regions[(*i)->layer()].push_back (*i);
 168                         relevant_layers.push_back ((*i)->layer());
 169                 }
 170         }
 171
 172         for (Crossfades::iterator i = _crossfades.begin(); i != _crossfades.end(); ++i) {
 173                 if ((*i)->coverage (start, end) != OverlapNone) {
 174                         relevant_xfades[(*i)->upper_layer()].push_back (*i);
 175                 }
 176         }
 177
 178 //      RegionSortByLayer layer_cmp;
 179 //      relevant_regions.sort (layer_cmp);
 180
 181         /* XXX this whole per-layer approach is a hack that
 182            should be removed once Crossfades become
 183            CrossfadeRegions and we just grab a list of relevant
 184            regions and call read_at() on all of them.
 185         */
 186
 187         sort (relevant_layers.begin(), relevant_layers.end());
 188
 189         for (vector<uint32_t>::iterator l = relevant_layers.begin(); l != relevant_layers.end(); ++l) {
 190
 191                 vector<boost::shared_ptr<Region> > r (relevant_regions[*l]);
 192                 vector<boost::shared_ptr<Crossfade> >& x (relevant_xfades[*l]);
 193
 194
 195                 for (vector<boost::shared_ptr<Region> >::iterator i = r.begin(); i != r.end(); ++i) {
 196                         boost::shared_ptr<AudioRegion> ar = boost::dynamic_pointer_cast<AudioRegion>(*i);
 197                         DEBUG_TRACE (DEBUG::AudioPlayback, string_compose ("read from region %1\n", ar->name()));
 198                         assert(ar);
 199                         ar->read_at (buf, mixdown_buffer, gain_buffer, start, cnt, chan_n, read_frames, skip_frames);
 200                         _read_data_count += ar->read_data_count();
 201                 }
 202
 203                 for (vector<boost::shared_ptr<Crossfade> >::iterator i = x.begin(); i != x.end(); ++i) {
 204                         (*i)->read_at (buf, mixdown_buffer, gain_buffer, start, cnt, chan_n);
 205
 206                         /* don't JACK up _read_data_count, since its the same data as we just
 207                            read from the regions, and the OS should handle that for us.
 208                         */
 209                 }
 210         }
 211
 212         delete rlist;
 213         return ret;
 214 }
 215
 216
 217 void
 218 AudioPlaylist::remove_dependents (boost::shared_ptr<Region> region)
 219 {
 220         boost::shared_ptr<AudioRegion> r = boost::dynamic_pointer_cast<AudioRegion> (region);
 221
 222         if (in_set_state) {
 223                 return;
 224         }
 225
 226         if (r == 0) {
 227                 fatal << _("programming error: non-audio Region passed to remove_overlap in audio playlist")
 228                       << endmsg;
 229                 return;
 230         }
 231
 232         for (Crossfades::iterator i = _crossfades.begin(); i != _crossfades.end(); ) {
 233
 234                 if ((*i)->involves (r)) {
 235                         i = _crossfades.erase (i);
 236                 } else {
 237                         ++i;
 238                 }
 239         }
 240 }
 241
 242
 243 void
 244 AudioPlaylist::flush_notifications ()
 245 {
 246         Playlist::flush_notifications();
 247
 248         if (in_flush) {
 249                 return;
 250         }
 251
 252         in_flush = true;
 253
 254         Crossfades::iterator a;
 255         for (a = _pending_xfade_adds.begin(); a != _pending_xfade_adds.end(); ++a) {
 256                 NewCrossfade (*a); /* EMIT SIGNAL */
 257         }
 258
 259         _pending_xfade_adds.clear ();
 260
 261         in_flush = false;
 262 }
 263
 264 void
 265 AudioPlaylist::refresh_dependents (boost::shared_ptr<Region> r)
 266 {
 267         boost::shared_ptr<AudioRegion> ar = boost::dynamic_pointer_cast<AudioRegion>(r);
 268         set<boost::shared_ptr<Crossfade> > updated;
 269
 270         if (ar == 0) {
 271                 return;
 272         }
 273
 274         for (Crossfades::iterator x = _crossfades.begin(); x != _crossfades.end();) {
 275
 276                 Crossfades::iterator tmp;
 277
 278                 tmp = x;
 279                 ++tmp;
 280
 281                 /* only update them once */
 282
 283                 if ((*x)->involves (ar)) {
 284
 285                         pair<set<boost::shared_ptr<Crossfade> >::iterator, bool> const u = updated.insert (*x);
 286
 287                         if (u.second) {
 288                                 /* x was successfully inserted into the set, so it has not already been updated */
 289                                 try {
 290                                         (*x)->refresh ();
 291                                 }
 292
 293                                 catch (Crossfade::NoCrossfadeHere& err) {
 294                                         // relax, Invalidated during refresh
 295                                 }
 296                         }
 297                 }
 298
 299                 x = tmp;
 300         }
 301 }
 302
 303 void
 304 AudioPlaylist::finalize_split_region (boost::shared_ptr<Region> o, boost::shared_ptr<Region> l, boost::shared_ptr<Region> r)
 305 {
 306         boost::shared_ptr<AudioRegion> orig  = boost::dynamic_pointer_cast<AudioRegion>(o);
 307         boost::shared_ptr<AudioRegion> left  = boost::dynamic_pointer_cast<AudioRegion>(l);
 308         boost::shared_ptr<AudioRegion> right = boost::dynamic_pointer_cast<AudioRegion>(r);
 309
 310         for (Crossfades::iterator x = _crossfades.begin(); x != _crossfades.end();) {
 311                 Crossfades::iterator tmp;
 312                 tmp = x;
 313                 ++tmp;
 314
 315                 boost::shared_ptr<Crossfade> fade;
 316
 317                 if ((*x)->_in == orig) {
 318                         if (! (*x)->covers(right->position())) {
 319                                 fade = boost::shared_ptr<Crossfade> (new Crossfade (*x, left, (*x)->_out));
 320                         } else {
 321                                 // Overlap, the crossfade is copied on the left side of the right region instead
 322                                 fade = boost::shared_ptr<Crossfade> (new Crossfade (*x, right, (*x)->_out));
 323                         }
 324                 }
 325
 326                 if ((*x)->_out == orig) {
 327                         if (! (*x)->covers(right->position())) {
 328                                 fade = boost::shared_ptr<Crossfade> (new Crossfade (*x, (*x)->_in, right));
 329                         } else {
 330                                 // Overlap, the crossfade is copied on the right side of the left region instead
 331                                 fade = boost::shared_ptr<Crossfade> (new Crossfade (*x, (*x)->_in, left));
 332                         }
 333                 }
 334
 335                 if (fade) {
 336                         _crossfades.remove (*x);
 337                         add_crossfade (fade);
 338                 }
 339                 x = tmp;
 340         }
 341 }
 342
 343 void
 344 AudioPlaylist::check_dependents (boost::shared_ptr<Region> r, bool norefresh)
 345 {
 346         boost::shared_ptr<AudioRegion> other;
 347         boost::shared_ptr<AudioRegion> region;
 348         boost::shared_ptr<AudioRegion> top;
 349         boost::shared_ptr<AudioRegion> bottom;
 350         boost::shared_ptr<Crossfade>   xfade;
 351         RegionList*  touched_regions = 0;
 352
 353         if (in_set_state || in_partition) {
 354                 return;
 355         }
 356
 357         if ((region = boost::dynamic_pointer_cast<AudioRegion> (r)) == 0) {
 358                 fatal << _("programming error: non-audio Region tested for overlap in audio playlist")
 359                       << endmsg;
 360                 return;
 361         }
 362
 363         if (!norefresh) {
 364                 refresh_dependents (r);
 365         }
 366
 367
 368         if (!_session.config.get_auto_xfade()) {
 369                 return;
 370         }
 371
 372         for (RegionList::iterator i = regions.begin(); i != regions.end(); ++i) {
 373                 other = boost::dynamic_pointer_cast<AudioRegion> (*i);
 374
 375                 if (other == region) {
 376                         continue;
 377                 }
 378
 379                 if (other->muted() || region->muted()) {
 380                         continue;
 381                 }
 382
 383
 384                 if (other->layer() < region->layer()) {
 385                         top = region;
 386                         bottom = other;
 387                 } else {
 388                         top = other;
 389                         bottom = region;
 390                 }
 391
 392                 if (!top->opaque()) {
 393                         continue;
 394                 }
 395
 396                 OverlapType c = top->coverage (bottom->position(), bottom->last_frame());
 397
 398                 delete touched_regions;
 399                 touched_regions = 0;
 400
 401                 try {
 402                         nframes_t xfade_length;
 403                         switch (c) {
 404                         case OverlapNone:
 405                                 break;
 406
 407                         case OverlapInternal:
 408                                  /* {=============== top  =============}
 409                                   *     [ ----- bottom  ------- ]
 410                                   */
 411                                 break;
 412
 413                         case OverlapExternal:
 414
 415                                 /*     [ -------- top ------- ]
 416                                  * {=========== bottom =============}
 417                                  */
 418
 419                                 /* to avoid discontinuities at the region boundaries of an internal
 420                                    overlap (this region is completely within another), we create
 421                                    two hidden crossfades at each boundary. this is not dependent
 422                                    on the auto-xfade option, because we require it as basic
 423                                    audio engineering.
 424                                 */
 425
 426                                 xfade_length = min ((framecnt_t) 720, top->length());
 427
 428                                 if (top_region_at (top->first_frame()) == top) {
 429
 430                                         xfade = boost::shared_ptr<Crossfade> (new Crossfade (top, bottom, xfade_length, top->first_frame(), StartOfIn));
 431                                         add_crossfade (xfade);
 432                                 }
 433
 434                                 if (top_region_at (top->last_frame() - 1) == top) {
 435
 436                                         /*
 437                                            only add a fade out if there is no region on top of the end of 'top' (which
 438                                            would cover it).
 439                                         */
 440
 441                                         xfade = boost::shared_ptr<Crossfade> (new Crossfade (bottom, top, xfade_length, top->last_frame() - xfade_length, EndOfOut));
 442                                         add_crossfade (xfade);
 443                                 }
 444                                 break;
 445                         case OverlapStart:
 446
 447                                 /*                   { ==== top ============ }
 448                                  *   [---- bottom -------------------]
 449                                  */
 450
 451                                 if (_session.config.get_xfade_model() == FullCrossfade) {
 452                                         touched_regions = regions_touched (top->first_frame(), bottom->last_frame());
 453                                         if (touched_regions->size() <= 2) {
 454                                                 xfade = boost::shared_ptr<Crossfade> (new Crossfade (region, other, _session.config.get_xfade_model(), _session.config.get_xfades_active()));
 455                                                 add_crossfade (xfade);
 456                                         }
 457                                 } else {
 458
 459                                         touched_regions = regions_touched (top->first_frame(),
 460                                                                            top->first_frame() + min ((framecnt_t) _session.config.get_short_xfade_seconds() * _session.frame_rate(),
 461                                                                                                      top->length()));
 462                                         if (touched_regions->size() <= 2) {
 463                                                 xfade = boost::shared_ptr<Crossfade> (new Crossfade (region, other, _session.config.get_xfade_model(), _session.config.get_xfades_active()));
 464                                                 add_crossfade (xfade);
 465                                         }
 466                                 }
 467                                 break;
 468                         case OverlapEnd:
 469
 470
 471                                 /* [---- top ------------------------]
 472                                  *                { ==== bottom ============ }
 473                                  */
 474
 475                                 if (_session.config.get_xfade_model() == FullCrossfade) {
 476
 477                                         touched_regions = regions_touched (bottom->first_frame(), top->last_frame());
 478                                         if (touched_regions->size() <= 2) {
 479                                                 xfade = boost::shared_ptr<Crossfade> (new Crossfade (region, other,
 480                                                                                                      _session.config.get_xfade_model(), _session.config.get_xfades_active()));
 481                                                 add_crossfade (xfade);
 482                                         }
 483
 484                                 } else {
 485                                         touched_regions = regions_touched (bottom->first_frame(),
 486                                                                            bottom->first_frame() + min ((framecnt_t)_session.config.get_short_xfade_seconds() * _session.frame_rate(),
 487                                                                                                         bottom->length()));
 488                                         if (touched_regions->size() <= 2) {
 489                                                 xfade = boost::shared_ptr<Crossfade> (new Crossfade (region, other, _session.config.get_xfade_model(), _session.config.get_xfades_active()));
 490                                                 add_crossfade (xfade);
 491                                         }
 492                                 }
 493                                 break;
 494                         default:
 495                                 xfade = boost::shared_ptr<Crossfade> (new Crossfade (region, other,
 496                                                                                      _session.config.get_xfade_model(), _session.config.get_xfades_active()));
 497                                 add_crossfade (xfade);
 498                         }
 499                 }
 500
 501                 catch (failed_constructor& err) {
 502                         continue;
 503                 }
 504
 505                 catch (Crossfade::NoCrossfadeHere& err) {
 506                         continue;
 507                 }
 508
 509         }
 510
 511         delete touched_regions;
 512 }
 513
 514 void
 515 AudioPlaylist::add_crossfade (boost::shared_ptr<Crossfade> xfade)
 516 {
 517         Crossfades::iterator ci;
 518
 519         for (ci = _crossfades.begin(); ci != _crossfades.end(); ++ci) {
 520                 if (*(*ci) == *xfade) { // Crossfade::operator==()
 521                         break;
 522                 }
 523         }
 524
 525         if (ci != _crossfades.end()) {
 526                 // it will just go away
 527         } else {
 528                 _crossfades.push_back (xfade);
 529
 530                 xfade->Invalidated.connect_same_thread (*this, boost::bind (&AudioPlaylist::crossfade_invalidated, this, _1));
 531                 xfade->PropertyChanged.connect_same_thread (*this, boost::bind (&AudioPlaylist::crossfade_changed, this, _1));
 532
 533                 notify_crossfade_added (xfade);
 534         }
 535 }
 536
 537 void AudioPlaylist::notify_crossfade_added (boost::shared_ptr<Crossfade> x)
 538 {
 539         if (g_atomic_int_get(&block_notifications)) {
 540                 _pending_xfade_adds.insert (_pending_xfade_adds.end(), x);
 541         } else {
 542                 NewCrossfade (x); /* EMIT SIGNAL */
 543         }
 544 }
 545
 546 void
 547 AudioPlaylist::crossfade_invalidated (boost::shared_ptr<Region> r)
 548 {
 549         Crossfades::iterator i;
 550         boost::shared_ptr<Crossfade> xfade = boost::dynamic_pointer_cast<Crossfade> (r);
 551
 552         xfade->in()->resume_fade_in ();
 553         xfade->out()->resume_fade_out ();
 554
 555         if ((i = find (_crossfades.begin(), _crossfades.end(), xfade)) != _crossfades.end()) {
 556                 _crossfades.erase (i);
 557         }
 558 }
 559
 560 int
 561 AudioPlaylist::set_state (const XMLNode& node, int version)
 562 {
 563         XMLNode *child;
 564         XMLNodeList nlist;
 565         XMLNodeConstIterator niter;
 566
 567         in_set_state++;
 568
 569         Playlist::set_state (node, version);
 570
 571         freeze ();
 572
 573         nlist = node.children();
 574
 575         for (niter = nlist.begin(); niter != nlist.end(); ++niter) {
 576
 577                 child = *niter;
 578
 579                 if (child->name() != "Crossfade") {
 580                         continue;
 581                 }
 582
 583                 try {
 584                         boost::shared_ptr<Crossfade> xfade = boost::shared_ptr<Crossfade> (new Crossfade (*((const Playlist *)this), *child));
 585                         _crossfades.push_back (xfade);
 586                         xfade->Invalidated.connect_same_thread (*this, boost::bind (&AudioPlaylist::crossfade_invalidated, this, _1));
 587                         xfade->PropertyChanged.connect_same_thread (*this, boost::bind (&AudioPlaylist::crossfade_changed, this, _1));
 588                         NewCrossfade(xfade);
 589                 }
 590
 591                 catch (failed_constructor& err) {
 592                         //      cout << string_compose (_("could not create crossfade object in playlist %1"),
 593                         //        _name)
 594                         //    << endl;
 595                         continue;
 596                 }
 597         }
 598
 599         thaw ();
 600         in_set_state--;
 601
 602         return 0;
 603 }
 604
 605 void
 606 AudioPlaylist::clear (bool with_signals)
 607 {
 608         _crossfades.clear ();
 609         Playlist::clear (with_signals);
 610 }
 611
 612 XMLNode&
 613 AudioPlaylist::state (bool full_state)
 614 {
 615         XMLNode& node = Playlist::state (full_state);
 616
 617         if (full_state) {
 618                 for (Crossfades::iterator i = _crossfades.begin(); i != _crossfades.end(); ++i) {
 619                         node.add_child_nocopy ((*i)->get_state());
 620                 }
 621         }
 622
 623         return node;
 624 }
 625
 626 void
 627 AudioPlaylist::dump () const
 628 {
 629         boost::shared_ptr<Region>r;
 630         boost::shared_ptr<Crossfade> x;
 631
 632         cerr << "Playlist \"" << _name << "\" " << endl
 633              << regions.size() << " regions "
 634              << _crossfades.size() << " crossfades"
 635              << endl;
 636
 637         for (RegionList::const_iterator i = regions.begin(); i != regions.end(); ++i) {
 638                 r = *i;
 639                 cerr << "  " << r->name() << " @ " << r << " ["
 640                      << r->start() << "+" << r->length()
 641                      << "] at "
 642                      << r->position()
 643                      << " on layer "
 644                      << r->layer ()
 645                      << endl;
 646         }
 647
 648         for (Crossfades::const_iterator i = _crossfades.begin(); i != _crossfades.end(); ++i) {
 649                 x = *i;
 650                 cerr << "  xfade ["
 651                      << x->out()->name()
 652                      << ','
 653                      << x->in()->name()
 654                      << " @ "
 655                      << x->position()
 656                      << " length = "
 657                      << x->length ()
 658                      << " active ? "
 659                      << (x->active() ? "yes" : "no")
 660                      << endl;
 661         }
 662 }
 663
 664 bool
 665 AudioPlaylist::destroy_region (boost::shared_ptr<Region> region)
 666 {
 667         boost::shared_ptr<AudioRegion> r = boost::dynamic_pointer_cast<AudioRegion> (region);
 668
 669         if (!r) {
 670                 return false;
 671         }
 672
 673         bool changed = false;
 674         Crossfades::iterator c, ctmp;
 675         set<boost::shared_ptr<Crossfade> > unique_xfades;
 676
 677         {
 678                 RegionLock rlock (this);
 679
 680                 for (RegionList::iterator i = regions.begin(); i != regions.end(); ) {
 681
 682                         RegionList::iterator tmp = i;
 683                         ++tmp;
 684
 685                         if ((*i) == region) {
 686                                 regions.erase (i);
 687                                 changed = true;
 688                         }
 689
 690                         i = tmp;
 691                 }
 692
 693                 for (set<boost::shared_ptr<Region> >::iterator x = all_regions.begin(); x != all_regions.end(); ) {
 694
 695                         set<boost::shared_ptr<Region> >::iterator xtmp = x;
 696                         ++xtmp;
 697
 698                         if ((*x) == region) {
 699                                 all_regions.erase (x);
 700                                 changed = true;
 701                         }
 702
 703                         x = xtmp;
 704                 }
 705
 706                 region->set_playlist (boost::shared_ptr<Playlist>());
 707         }
 708
 709         for (c = _crossfades.begin(); c != _crossfades.end(); ) {
 710                 ctmp = c;
 711                 ++ctmp;
 712
 713                 if ((*c)->involves (r)) {
 714                         unique_xfades.insert (*c);
 715                         _crossfades.erase (c);
 716                 }
 717
 718                 c = ctmp;
 719         }
 720
 721         if (changed) {
 722                 /* overload this, it normally means "removed", not destroyed */
 723                 notify_region_removed (region);
 724         }
 725
 726         return changed;
 727 }
 728
 729 void
 730 AudioPlaylist::crossfade_changed (const PropertyChange&)
 731 {
 732         if (in_flush || in_set_state) {
 733                 return;
 734         }
 735
 736         /* XXX is there a loop here? can an xfade change not happen
 737            due to a playlist change? well, sure activation would
 738            be an example. maybe we should check the type of change
 739            that occured.
 740         */
 741
 742         notify_contents_changed ();
 743 }
 744
 745 bool
 746 AudioPlaylist::region_changed (const PropertyChange& what_changed, boost::shared_ptr<Region> region)
 747 {
 748         if (in_flush || in_set_state) {
 749                 return false;
 750         }
 751
 752         PropertyChange our_interests;
 753
 754         our_interests.add (Properties::fade_in_active);
 755         our_interests.add (Properties::fade_out_active);
 756         our_interests.add (Properties::scale_amplitude);
 757         our_interests.add (Properties::envelope_active);
 758         our_interests.add (Properties::envelope);
 759         our_interests.add (Properties::fade_in);
 760         our_interests.add (Properties::fade_out);
 761
 762         bool parent_wants_notify;
 763
 764         parent_wants_notify = Playlist::region_changed (what_changed, region);
 765
 766         if (parent_wants_notify || (what_changed.contains (our_interests))) {
 767                 notify_contents_changed ();
 768         }
 769
 770         return true;
 771 }
 772
 773 void
 774 AudioPlaylist::crossfades_at (nframes_t frame, Crossfades& clist)
 775 {
 776         RegionLock rlock (this);
 777
 778         for (Crossfades::iterator i = _crossfades.begin(); i != _crossfades.end(); ++i) {
 779                 nframes_t start, end;
 780
 781                 start = (*i)->position();
 782                 end = start + (*i)->overlap_length(); // not length(), important difference
 783
 784                 if (frame >= start && frame <= end) {
 785                         clist.push_back (*i);
 786                 }
 787         }
 788 }
 789
 790 void
 791 AudioPlaylist::foreach_crossfade (boost::function<void (boost::shared_ptr<Crossfade>)> s)
 792 {
 793         RegionLock rl (this, false);
 794         for (Crossfades::iterator i = _crossfades.begin(); i != _crossfades.end(); ++i) {
 795                 s (*i);
 796         }
 797 }