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 #include "ardour/types.h"
  25 #include "ardour/debug.h"
  26 #include "ardour/configuration.h"
  27 #include "ardour/audioplaylist.h"
  28 #include "ardour/audioregion.h"
  29 #include "ardour/crossfade.h"
  30 #include "ardour/session.h"
  31 #include "pbd/enumwriter.h"
  32
  33 #include "i18n.h"
  34
  35 using namespace ARDOUR;
  36 using namespace std;
  37 using namespace PBD;
  38
  39 namespace ARDOUR {
  40         namespace Properties {
  41                 PBD::PropertyDescriptor<bool> crossfades;
  42         }
  43 }
  44
  45 void
  46 AudioPlaylist::make_property_quarks ()
  47 {
  48         Properties::crossfades.property_id = g_quark_from_static_string (X_("crossfades"));
  49         DEBUG_TRACE (DEBUG::Properties, string_compose ("quark for crossfades = %1\n", Properties::crossfades.property_id));
  50 }
  51
  52 CrossfadeListProperty::CrossfadeListProperty (AudioPlaylist& pl)
  53         : SequenceProperty<std::list<boost::shared_ptr<Crossfade> > > (Properties::crossfades.property_id, boost::bind (&AudioPlaylist::update, &pl, _1))
  54         , _playlist (pl)
  55 {
  56
  57 }
  58
  59 CrossfadeListProperty::CrossfadeListProperty (CrossfadeListProperty const & p)
  60         : PBD::SequenceProperty<std::list<boost::shared_ptr<Crossfade> > > (p)
  61         , _playlist (p._playlist)
  62 {
  63
  64 }
  65
  66
  67 CrossfadeListProperty *
  68 CrossfadeListProperty::create () const
  69 {
  70         return new CrossfadeListProperty (_playlist);
  71 }
  72
  73 CrossfadeListProperty *
  74 CrossfadeListProperty::clone () const
  75 {
  76         return new CrossfadeListProperty (*this);
  77 }
  78
  79 void
  80 CrossfadeListProperty::get_content_as_xml (boost::shared_ptr<Crossfade> xfade, XMLNode & node) const
  81 {
  82         /* Crossfades are not written to any state when they are no
  83            longer in use, so we must write their state here.
  84         */
  85
  86         XMLNode& c = xfade->get_state ();
  87         node.add_child_nocopy (c);
  88 }
  89
  90 boost::shared_ptr<Crossfade>
  91 CrossfadeListProperty::get_content_from_xml (XMLNode const & node) const
  92 {
  93         XMLNodeList const c = node.children ();
  94         assert (c.size() == 1);
  95         return boost::shared_ptr<Crossfade> (new Crossfade (_playlist, *c.front()));
  96 }
  97
  98
  99 AudioPlaylist::AudioPlaylist (Session& session, const XMLNode& node, bool hidden)
 100         : Playlist (session, node, DataType::AUDIO, hidden)
 101         , _crossfades (*this)
 102 {
 103 #ifndef NDEBUG
 104         const XMLProperty* prop = node.property("type");
 105         assert(!prop || DataType(prop->value()) == DataType::AUDIO);
 106 #endif
 107
 108         add_property (_crossfades);
 109
 110         in_set_state++;
 111         set_state (node, Stateful::loading_state_version);
 112         in_set_state--;
 113 }
 114
 115 AudioPlaylist::AudioPlaylist (Session& session, string name, bool hidden)
 116         : Playlist (session, name, DataType::AUDIO, hidden)
 117         , _crossfades (*this)
 118 {
 119         add_property (_crossfades);
 120 }
 121
 122 AudioPlaylist::AudioPlaylist (boost::shared_ptr<const AudioPlaylist> other, string name, bool hidden)
 123         : Playlist (other, name, hidden)
 124         , _crossfades (*this)
 125 {
 126         add_property (_crossfades);
 127
 128         RegionList::const_iterator in_o  = other->regions.begin();
 129         RegionList::iterator in_n = regions.begin();
 130
 131         while (in_o != other->regions.end()) {
 132                 boost::shared_ptr<AudioRegion> ar = boost::dynamic_pointer_cast<AudioRegion>(*in_o);
 133
 134                 // We look only for crossfades which begin with the current region, so we don't get doubles
 135                 for (Crossfades::const_iterator xfades = other->_crossfades.begin(); xfades != other->_crossfades.end(); ++xfades) {
 136                         if ((*xfades)->in() == ar) {
 137                                 // We found one! Now copy it!
 138
 139                                 RegionList::const_iterator out_o = other->regions.begin();
 140                                 RegionList::const_iterator out_n = regions.begin();
 141
 142                                 while (out_o != other->regions.end()) {
 143
 144                                         boost::shared_ptr<AudioRegion>ar2 = boost::dynamic_pointer_cast<AudioRegion>(*out_o);
 145
 146                                         if ((*xfades)->out() == ar2) {
 147                                                 boost::shared_ptr<AudioRegion>in  = boost::dynamic_pointer_cast<AudioRegion>(*in_n);
 148                                                 boost::shared_ptr<AudioRegion>out = boost::dynamic_pointer_cast<AudioRegion>(*out_n);
 149                                                 boost::shared_ptr<Crossfade> new_fade = boost::shared_ptr<Crossfade> (new Crossfade (*xfades, in, out));
 150                                                 add_crossfade(new_fade);
 151                                                 break;
 152                                         }
 153
 154                                         out_o++;
 155                                         out_n++;
 156                                 }
 157 //                              cerr << "HUH!? second region in the crossfade not found!" << endl;
 158                         }
 159                 }
 160
 161                 in_o++;
 162                 in_n++;
 163         }
 164 }
 165
 166 AudioPlaylist::AudioPlaylist (boost::shared_ptr<const AudioPlaylist> other, framepos_t start, framecnt_t cnt, string name, bool hidden)
 167         : Playlist (other, start, cnt, name, hidden)
 168         , _crossfades (*this)
 169 {
 170         RegionLock rlock2 (const_cast<AudioPlaylist*> (other.get()));
 171         in_set_state++;
 172
 173         add_property (_crossfades);
 174
 175         framepos_t const end = start + cnt - 1;
 176
 177         /* Audio regions that have been created by the Playlist constructor
 178            will currently have the same fade in/out as the regions that they
 179            were created from.  This is wrong, so reset the fades here.
 180         */
 181
 182         RegionList::iterator ours = regions.begin ();
 183
 184         for (RegionList::const_iterator i = other->regions.begin(); i != other->regions.end(); ++i) {
 185                 boost::shared_ptr<AudioRegion> region = boost::dynamic_pointer_cast<AudioRegion> (*i);
 186                 assert (region);
 187
 188                 framecnt_t fade_in = 64;
 189                 framecnt_t fade_out = 64;
 190
 191                 switch (region->coverage (start, end)) {
 192                 case OverlapNone:
 193                         continue;
 194
 195                 case OverlapInternal:
 196                 {
 197                         framecnt_t const offset = start - region->position ();
 198                         framecnt_t const trim = region->last_frame() - end;
 199                         if (region->fade_in()->back()->when > offset) {
 200                                 fade_in = region->fade_in()->back()->when - offset;
 201                         }
 202                         if (region->fade_out()->back()->when > trim) {
 203                                 fade_out = region->fade_out()->back()->when - trim;
 204                         }
 205                         break;
 206                 }
 207
 208                 case OverlapStart:
 209                 {
 210                         if (region->fade_in()->back()->when > 0) {
 211                                 fade_in = region->fade_in()->back()->when;
 212                         }
 213                         if (start > region->last_frame() - region->fade_out()->back()->when) {
 214                                 fade_out = region->last_frame() - start;
 215                         }
 216                         break;
 217                 }
 218
 219                 case OverlapEnd:
 220                 {
 221                         framecnt_t const offset = start - region->position();
 222                         if (region->fade_in()->back()->when > offset) {
 223                                 fade_in = region->fade_in()->back()->when - offset;
 224                         }
 225                         if (start > region->last_frame() - region->fade_out()->back()->when) {
 226                                 fade_out = region->last_frame() - start;
 227                         } else {
 228                                 fade_out = region->fade_out()->back()->when;
 229                         }
 230                         break;
 231                 }
 232
 233                 case OverlapExternal:
 234                         fade_in = region->fade_in()->back()->when;
 235                         fade_out = region->fade_out()->back()->when;
 236                         break;
 237                 }
 238
 239                 boost::shared_ptr<AudioRegion> our_region = boost::dynamic_pointer_cast<AudioRegion> (*ours);
 240                 assert (our_region);
 241
 242                 our_region->set_fade_in_length (fade_in);
 243                 our_region->set_fade_out_length (fade_out);
 244                 ++ours;
 245         }
 246
 247         in_set_state--;
 248
 249         /* this constructor does NOT notify others (session) */
 250 }
 251
 252 AudioPlaylist::~AudioPlaylist ()
 253 {
 254         _crossfades.clear ();
 255 }
 256
 257 struct RegionSortByLayer {
 258     bool operator() (boost::shared_ptr<Region> a, boost::shared_ptr<Region> b) {
 259             return a->layer() < b->layer();
 260     }
 261 };
 262
 263 ARDOUR::framecnt_t
 264 AudioPlaylist::read (Sample *buf, Sample *mixdown_buffer, float *gain_buffer, framepos_t start,
 265                      framecnt_t cnt, unsigned chan_n)
 266 {
 267         framecnt_t ret = cnt;
 268
 269         /* optimizing this memset() away involves a lot of conditionals
 270            that may well cause more of a hit due to cache misses
 271            and related stuff than just doing this here.
 272
 273            it would be great if someone could measure this
 274            at some point.
 275
 276            one way or another, parts of the requested area
 277            that are not written to by Region::region_at()
 278            for all Regions that cover the area need to be
 279            zeroed.
 280         */
 281
 282         memset (buf, 0, sizeof (Sample) * cnt);
 283
 284         /* this function is never called from a realtime thread, so
 285            its OK to block (for short intervals).
 286         */
 287
 288         Glib::RecMutex::Lock rm (region_lock);
 289
 290         framepos_t const end = start + cnt - 1;
 291         framecnt_t read_frames = 0;
 292         framecnt_t skip_frames = 0;
 293         _read_data_count = 0;
 294
 295         _read_data_count = 0;
 296
 297         RegionList* rlist = regions_to_read (start, start+cnt);
 298
 299         if (rlist->empty()) {
 300                 delete rlist;
 301                 return cnt;
 302         }
 303
 304         map<uint32_t,vector<boost::shared_ptr<Region> > > relevant_regions;
 305         map<uint32_t,vector<boost::shared_ptr<Crossfade> > > relevant_xfades;
 306         vector<uint32_t> relevant_layers;
 307
 308         for (RegionList::iterator i = rlist->begin(); i != rlist->end(); ++i) {
 309                 if ((*i)->coverage (start, end) != OverlapNone) {
 310                         relevant_regions[(*i)->layer()].push_back (*i);
 311                         relevant_layers.push_back ((*i)->layer());
 312                 }
 313         }
 314
 315         for (Crossfades::iterator i = _crossfades.begin(); i != _crossfades.end(); ++i) {
 316                 if ((*i)->coverage (start, end) != OverlapNone) {
 317                         relevant_xfades[(*i)->upper_layer()].push_back (*i);
 318                 }
 319         }
 320
 321 //      RegionSortByLayer layer_cmp;
 322 //      relevant_regions.sort (layer_cmp);
 323
 324         /* XXX this whole per-layer approach is a hack that
 325            should be removed once Crossfades become
 326            CrossfadeRegions and we just grab a list of relevant
 327            regions and call read_at() on all of them.
 328         */
 329
 330         sort (relevant_layers.begin(), relevant_layers.end());
 331
 332         for (vector<uint32_t>::iterator l = relevant_layers.begin(); l != relevant_layers.end(); ++l) {
 333
 334                 vector<boost::shared_ptr<Region> > r (relevant_regions[*l]);
 335                 vector<boost::shared_ptr<Crossfade> >& x (relevant_xfades[*l]);
 336
 337
 338                 for (vector<boost::shared_ptr<Region> >::iterator i = r.begin(); i != r.end(); ++i) {
 339                         boost::shared_ptr<AudioRegion> ar = boost::dynamic_pointer_cast<AudioRegion>(*i);
 340                         DEBUG_TRACE (DEBUG::AudioPlayback, string_compose ("read from region %1\n", ar->name()));
 341                         assert(ar);
 342                         ar->read_at (buf, mixdown_buffer, gain_buffer, start, cnt, chan_n, read_frames, skip_frames);
 343                         _read_data_count += ar->read_data_count();
 344                 }
 345
 346                 for (vector<boost::shared_ptr<Crossfade> >::iterator i = x.begin(); i != x.end(); ++i) {
 347                         (*i)->read_at (buf, mixdown_buffer, gain_buffer, start, cnt, chan_n);
 348
 349                         /* don't JACK up _read_data_count, since its the same data as we just
 350                            read from the regions, and the OS should handle that for us.
 351                         */
 352                 }
 353         }
 354
 355         delete rlist;
 356         return ret;
 357 }
 358
 359
 360 void
 361 AudioPlaylist::remove_dependents (boost::shared_ptr<Region> region)
 362 {
 363         boost::shared_ptr<AudioRegion> r = boost::dynamic_pointer_cast<AudioRegion> (region);
 364
 365         if (in_set_state) {
 366                 return;
 367         }
 368
 369         if (r == 0) {
 370                 fatal << _("programming error: non-audio Region passed to remove_overlap in audio playlist")
 371                       << endmsg;
 372                 return;
 373         }
 374
 375         for (Crossfades::iterator i = _crossfades.begin(); i != _crossfades.end(); ) {
 376
 377                 if ((*i)->involves (r)) {
 378                         i = _crossfades.erase (i);
 379                 } else {
 380                         ++i;
 381                 }
 382         }
 383 }
 384
 385
 386 void
 387 AudioPlaylist::flush_notifications (bool from_undo)
 388 {
 389         Playlist::flush_notifications (from_undo);
 390
 391         if (in_flush) {
 392                 return;
 393         }
 394
 395         in_flush = true;
 396
 397         Crossfades::iterator a;
 398         for (a = _pending_xfade_adds.begin(); a != _pending_xfade_adds.end(); ++a) {
 399                 NewCrossfade (*a); /* EMIT SIGNAL */
 400         }
 401
 402         _pending_xfade_adds.clear ();
 403
 404         in_flush = false;
 405 }
 406
 407 void
 408 AudioPlaylist::refresh_dependents (boost::shared_ptr<Region> r)
 409 {
 410         boost::shared_ptr<AudioRegion> ar = boost::dynamic_pointer_cast<AudioRegion>(r);
 411         set<boost::shared_ptr<Crossfade> > updated;
 412
 413         if (ar == 0) {
 414                 return;
 415         }
 416
 417         for (Crossfades::iterator x = _crossfades.begin(); x != _crossfades.end();) {
 418
 419                 Crossfades::iterator tmp;
 420
 421                 tmp = x;
 422                 ++tmp;
 423
 424                 /* only update them once */
 425
 426                 if ((*x)->involves (ar)) {
 427
 428                         pair<set<boost::shared_ptr<Crossfade> >::iterator, bool> const u = updated.insert (*x);
 429
 430                         if (u.second) {
 431                                 /* x was successfully inserted into the set, so it has not already been updated */
 432                                 try {
 433                                         (*x)->refresh ();
 434                                 }
 435
 436                                 catch (Crossfade::NoCrossfadeHere& err) {
 437                                         // relax, Invalidated during refresh
 438                                 }
 439                         }
 440                 }
 441
 442                 x = tmp;
 443         }
 444 }
 445
 446 void
 447 AudioPlaylist::finalize_split_region (boost::shared_ptr<Region> o, boost::shared_ptr<Region> l, boost::shared_ptr<Region> r)
 448 {
 449         boost::shared_ptr<AudioRegion> orig  = boost::dynamic_pointer_cast<AudioRegion>(o);
 450         boost::shared_ptr<AudioRegion> left  = boost::dynamic_pointer_cast<AudioRegion>(l);
 451         boost::shared_ptr<AudioRegion> right = boost::dynamic_pointer_cast<AudioRegion>(r);
 452
 453         for (Crossfades::iterator x = _crossfades.begin(); x != _crossfades.end();) {
 454                 Crossfades::iterator tmp;
 455                 tmp = x;
 456                 ++tmp;
 457
 458                 boost::shared_ptr<Crossfade> fade;
 459
 460                 if ((*x)->_in == orig) {
 461                         if (! (*x)->covers(right->position())) {
 462                                 fade = boost::shared_ptr<Crossfade> (new Crossfade (*x, left, (*x)->_out));
 463                         } else {
 464                                 // Overlap, the crossfade is copied on the left side of the right region instead
 465                                 fade = boost::shared_ptr<Crossfade> (new Crossfade (*x, right, (*x)->_out));
 466                         }
 467                 }
 468
 469                 if ((*x)->_out == orig) {
 470                         if (! (*x)->covers(right->position())) {
 471                                 fade = boost::shared_ptr<Crossfade> (new Crossfade (*x, (*x)->_in, right));
 472                         } else {
 473                                 // Overlap, the crossfade is copied on the right side of the left region instead
 474                                 fade = boost::shared_ptr<Crossfade> (new Crossfade (*x, (*x)->_in, left));
 475                         }
 476                 }
 477
 478                 if (fade) {
 479                         _crossfades.remove (*x);
 480                         add_crossfade (fade);
 481                 }
 482                 x = tmp;
 483         }
 484 }
 485
 486 void
 487 AudioPlaylist::check_dependents (boost::shared_ptr<Region> r, bool norefresh)
 488 {
 489         boost::shared_ptr<AudioRegion> other;
 490         boost::shared_ptr<AudioRegion> region;
 491         boost::shared_ptr<AudioRegion> top;
 492         boost::shared_ptr<AudioRegion> bottom;
 493         boost::shared_ptr<Crossfade>   xfade;
 494         RegionList*  touched_regions = 0;
 495
 496         if (in_set_state || in_partition) {
 497                 return;
 498         }
 499
 500         if ((region = boost::dynamic_pointer_cast<AudioRegion> (r)) == 0) {
 501                 fatal << _("programming error: non-audio Region tested for overlap in audio playlist")
 502                       << endmsg;
 503                 return;
 504         }
 505
 506         if (!norefresh) {
 507                 refresh_dependents (r);
 508         }
 509
 510
 511         if (!_session.config.get_auto_xfade()) {
 512                 return;
 513         }
 514
 515         for (RegionList::iterator i = regions.begin(); i != regions.end(); ++i) {
 516                 other = boost::dynamic_pointer_cast<AudioRegion> (*i);
 517
 518                 if (other == region) {
 519                         continue;
 520                 }
 521
 522                 if (other->muted() || region->muted()) {
 523                         continue;
 524                 }
 525
 526                 if (other->position() == r->position() && other->length() == r->length()) {
 527                         /* precise overlay of two regions - no xfade */
 528                         continue;
 529                 }
 530
 531                 if (other->layer() < region->layer()) {
 532                         top = region;
 533                         bottom = other;
 534                 } else {
 535                         top = other;
 536                         bottom = region;
 537                 }
 538
 539                 if (!top->opaque()) {
 540                         continue;
 541                 }
 542
 543                 OverlapType c = top->coverage (bottom->position(), bottom->last_frame());
 544
 545                 delete touched_regions;
 546                 touched_regions = 0;
 547
 548                 try {
 549                         framecnt_t xfade_length;
 550                         switch (c) {
 551                         case OverlapNone:
 552                                 break;
 553
 554                         case OverlapInternal:
 555                                  /* {=============== top  =============}
 556                                   *     [ ----- bottom  ------- ]
 557                                   */
 558                                 break;
 559
 560                         case OverlapExternal:
 561
 562                                 /*     [ -------- top ------- ]
 563                                  * {=========== bottom =============}
 564                                  */
 565
 566                                 /* to avoid discontinuities at the region boundaries of an internal
 567                                    overlap (this region is completely within another), we create
 568                                    two hidden crossfades at each boundary. this is not dependent
 569                                    on the auto-xfade option, because we require it as basic
 570                                    audio engineering.
 571                                 */
 572
 573                                 xfade_length = min ((framecnt_t) 720, top->length());
 574
 575                                 if (top_region_at (top->first_frame()) == top) {
 576
 577                                         xfade = boost::shared_ptr<Crossfade> (new Crossfade (top, bottom, xfade_length, top->first_frame(), StartOfIn));
 578                                         add_crossfade (xfade);
 579                                 }
 580
 581                                 if (top_region_at (top->last_frame() - 1) == top) {
 582
 583                                         /*
 584                                            only add a fade out if there is no region on top of the end of 'top' (which
 585                                            would cover it).
 586                                         */
 587
 588                                         xfade = boost::shared_ptr<Crossfade> (new Crossfade (bottom, top, xfade_length, top->last_frame() - xfade_length, EndOfOut));
 589                                         add_crossfade (xfade);
 590                                 }
 591                                 break;
 592                         case OverlapStart:
 593
 594                                 /*                   { ==== top ============ }
 595                                  *   [---- bottom -------------------]
 596                                  */
 597
 598                                 if (_session.config.get_xfade_model() == FullCrossfade) {
 599                                         touched_regions = regions_touched (top->first_frame(), bottom->last_frame());
 600                                         if (touched_regions->size() <= 2) {
 601                                                 xfade = boost::shared_ptr<Crossfade> (new Crossfade (region, other, _session.config.get_xfade_model(), _session.config.get_xfades_active()));
 602                                                 add_crossfade (xfade);
 603                                         }
 604                                 } else {
 605
 606                                         touched_regions = regions_touched (top->first_frame(),
 607                                                                            top->first_frame() + min ((framecnt_t) _session.config.get_short_xfade_seconds() * _session.frame_rate(),
 608                                                                                                      top->length()));
 609                                         if (touched_regions->size() <= 2) {
 610                                                 xfade = boost::shared_ptr<Crossfade> (new Crossfade (region, other, _session.config.get_xfade_model(), _session.config.get_xfades_active()));
 611                                                 add_crossfade (xfade);
 612                                         }
 613                                 }
 614                                 break;
 615                         case OverlapEnd:
 616
 617
 618                                 /* [---- top ------------------------]
 619                                  *                { ==== bottom ============ }
 620                                  */
 621
 622                                 if (_session.config.get_xfade_model() == FullCrossfade) {
 623
 624                                         touched_regions = regions_touched (bottom->first_frame(), top->last_frame());
 625                                         if (touched_regions->size() <= 2) {
 626                                                 xfade = boost::shared_ptr<Crossfade> (new Crossfade (region, other,
 627                                                                                                      _session.config.get_xfade_model(), _session.config.get_xfades_active()));
 628                                                 add_crossfade (xfade);
 629                                         }
 630
 631                                 } else {
 632                                         touched_regions = regions_touched (bottom->first_frame(),
 633                                                                            bottom->first_frame() + min ((framecnt_t)_session.config.get_short_xfade_seconds() * _session.frame_rate(),
 634                                                                                                         bottom->length()));
 635                                         if (touched_regions->size() <= 2) {
 636                                                 xfade = boost::shared_ptr<Crossfade> (new Crossfade (region, other, _session.config.get_xfade_model(), _session.config.get_xfades_active()));
 637                                                 add_crossfade (xfade);
 638                                         }
 639                                 }
 640                                 break;
 641                         default:
 642                                 xfade = boost::shared_ptr<Crossfade> (new Crossfade (region, other,
 643                                                                                      _session.config.get_xfade_model(), _session.config.get_xfades_active()));
 644                                 add_crossfade (xfade);
 645                         }
 646                 }
 647
 648                 catch (failed_constructor& err) {
 649                         continue;
 650                 }
 651
 652                 catch (Crossfade::NoCrossfadeHere& err) {
 653                         continue;
 654                 }
 655
 656         }
 657
 658         delete touched_regions;
 659 }
 660
 661 void
 662 AudioPlaylist::add_crossfade (boost::shared_ptr<Crossfade> xfade)
 663 {
 664         Crossfades::iterator ci;
 665
 666         for (ci = _crossfades.begin(); ci != _crossfades.end(); ++ci) {
 667                 if (*(*ci) == *xfade) { // Crossfade::operator==()
 668                         break;
 669                 }
 670         }
 671
 672         if (ci != _crossfades.end()) {
 673                 // it will just go away
 674         } else {
 675                 _crossfades.push_back (xfade);
 676
 677                 xfade->Invalidated.connect_same_thread (*this, boost::bind (&AudioPlaylist::crossfade_invalidated, this, _1));
 678                 xfade->PropertyChanged.connect_same_thread (*this, boost::bind (&AudioPlaylist::crossfade_changed, this, _1));
 679
 680                 notify_crossfade_added (xfade);
 681         }
 682 }
 683
 684 void AudioPlaylist::notify_crossfade_added (boost::shared_ptr<Crossfade> x)
 685 {
 686         if (g_atomic_int_get(&block_notifications)) {
 687                 _pending_xfade_adds.insert (_pending_xfade_adds.end(), x);
 688         } else {
 689                 NewCrossfade (x); /* EMIT SIGNAL */
 690         }
 691 }
 692
 693 void
 694 AudioPlaylist::crossfade_invalidated (boost::shared_ptr<Region> r)
 695 {
 696         Crossfades::iterator i;
 697         boost::shared_ptr<Crossfade> xfade = boost::dynamic_pointer_cast<Crossfade> (r);
 698
 699         xfade->in()->resume_fade_in ();
 700         xfade->out()->resume_fade_out ();
 701
 702         if ((i = find (_crossfades.begin(), _crossfades.end(), xfade)) != _crossfades.end()) {
 703                 _crossfades.erase (i);
 704         }
 705 }
 706
 707 int
 708 AudioPlaylist::set_state (const XMLNode& node, int version)
 709 {
 710         XMLNode *child;
 711         XMLNodeList nlist;
 712         XMLNodeConstIterator niter;
 713
 714         in_set_state++;
 715
 716         Playlist::set_state (node, version);
 717
 718         freeze ();
 719
 720         nlist = node.children();
 721
 722         for (niter = nlist.begin(); niter != nlist.end(); ++niter) {
 723
 724                 child = *niter;
 725
 726                 if (child->name() != "Crossfade") {
 727                         continue;
 728                 }
 729
 730                 try {
 731                         boost::shared_ptr<Crossfade> xfade = boost::shared_ptr<Crossfade> (new Crossfade (*((const Playlist *)this), *child));
 732                         _crossfades.push_back (xfade);
 733                         xfade->Invalidated.connect_same_thread (*this, boost::bind (&AudioPlaylist::crossfade_invalidated, this, _1));
 734                         xfade->PropertyChanged.connect_same_thread (*this, boost::bind (&AudioPlaylist::crossfade_changed, this, _1));
 735                         NewCrossfade(xfade);
 736                 }
 737
 738                 catch (failed_constructor& err) {
 739                         //      cout << string_compose (_("could not create crossfade object in playlist %1"),
 740                         //        _name)
 741                         //    << endl;
 742                         continue;
 743                 }
 744         }
 745
 746         thaw ();
 747         in_set_state--;
 748
 749         return 0;
 750 }
 751
 752 void
 753 AudioPlaylist::clear (bool with_signals)
 754 {
 755         _crossfades.clear ();
 756         Playlist::clear (with_signals);
 757 }
 758
 759 XMLNode&
 760 AudioPlaylist::state (bool full_state)
 761 {
 762         XMLNode& node = Playlist::state (full_state);
 763
 764         if (full_state) {
 765                 for (Crossfades::iterator i = _crossfades.begin(); i != _crossfades.end(); ++i) {
 766                         node.add_child_nocopy ((*i)->get_state());
 767                 }
 768         }
 769
 770         return node;
 771 }
 772
 773 void
 774 AudioPlaylist::dump () const
 775 {
 776         boost::shared_ptr<Region>r;
 777         boost::shared_ptr<Crossfade> x;
 778
 779         cerr << "Playlist \"" << _name << "\" " << endl
 780              << regions.size() << " regions "
 781              << _crossfades.size() << " crossfades"
 782              << endl;
 783
 784         for (RegionList::const_iterator i = regions.begin(); i != regions.end(); ++i) {
 785                 r = *i;
 786                 cerr << "  " << r->name() << " @ " << r << " ["
 787                      << r->start() << "+" << r->length()
 788                      << "] at "
 789                      << r->position()
 790                      << " on layer "
 791                      << r->layer ()
 792                      << endl;
 793         }
 794
 795         for (Crossfades::const_iterator i = _crossfades.begin(); i != _crossfades.end(); ++i) {
 796                 x = *i;
 797                 cerr << "  xfade ["
 798                      << x->out()->name()
 799                      << ','
 800                      << x->in()->name()
 801                      << " @ "
 802                      << x->position()
 803                      << " length = "
 804                      << x->length ()
 805                      << " active ? "
 806                      << (x->active() ? "yes" : "no")
 807                      << endl;
 808         }
 809 }
 810
 811 bool
 812 AudioPlaylist::destroy_region (boost::shared_ptr<Region> region)
 813 {
 814         boost::shared_ptr<AudioRegion> r = boost::dynamic_pointer_cast<AudioRegion> (region);
 815
 816         if (!r) {
 817                 return false;
 818         }
 819
 820         bool changed = false;
 821         Crossfades::iterator c, ctmp;
 822         set<boost::shared_ptr<Crossfade> > unique_xfades;
 823
 824         {
 825                 RegionLock rlock (this);
 826
 827                 for (RegionList::iterator i = regions.begin(); i != regions.end(); ) {
 828
 829                         RegionList::iterator tmp = i;
 830                         ++tmp;
 831
 832                         if ((*i) == region) {
 833                                 regions.erase (i);
 834                                 changed = true;
 835                         }
 836
 837                         i = tmp;
 838                 }
 839
 840                 for (set<boost::shared_ptr<Region> >::iterator x = all_regions.begin(); x != all_regions.end(); ) {
 841
 842                         set<boost::shared_ptr<Region> >::iterator xtmp = x;
 843                         ++xtmp;
 844
 845                         if ((*x) == region) {
 846                                 all_regions.erase (x);
 847                                 changed = true;
 848                         }
 849
 850                         x = xtmp;
 851                 }
 852
 853                 region->set_playlist (boost::shared_ptr<Playlist>());
 854         }
 855
 856         for (c = _crossfades.begin(); c != _crossfades.end(); ) {
 857                 ctmp = c;
 858                 ++ctmp;
 859
 860                 if ((*c)->involves (r)) {
 861                         unique_xfades.insert (*c);
 862                         _crossfades.erase (c);
 863                 }
 864
 865                 c = ctmp;
 866         }
 867
 868         if (changed) {
 869                 /* overload this, it normally means "removed", not destroyed */
 870                 notify_region_removed (region);
 871         }
 872
 873         return changed;
 874 }
 875
 876 void
 877 AudioPlaylist::crossfade_changed (const PropertyChange&)
 878 {
 879         if (in_flush || in_set_state) {
 880                 return;
 881         }
 882
 883         /* XXX is there a loop here? can an xfade change not happen
 884            due to a playlist change? well, sure activation would
 885            be an example. maybe we should check the type of change
 886            that occured.
 887         */
 888
 889         notify_contents_changed ();
 890 }
 891
 892 bool
 893 AudioPlaylist::region_changed (const PropertyChange& what_changed, boost::shared_ptr<Region> region)
 894 {
 895         if (in_flush || in_set_state) {
 896                 return false;
 897         }
 898
 899         PropertyChange our_interests;
 900
 901         our_interests.add (Properties::fade_in_active);
 902         our_interests.add (Properties::fade_out_active);
 903         our_interests.add (Properties::scale_amplitude);
 904         our_interests.add (Properties::envelope_active);
 905         our_interests.add (Properties::envelope);
 906         our_interests.add (Properties::fade_in);
 907         our_interests.add (Properties::fade_out);
 908
 909         bool parent_wants_notify;
 910
 911         parent_wants_notify = Playlist::region_changed (what_changed, region);
 912
 913         if (parent_wants_notify || (what_changed.contains (our_interests))) {
 914                 notify_contents_changed ();
 915         }
 916
 917         return true;
 918 }
 919
 920 void
 921 AudioPlaylist::crossfades_at (framepos_t frame, Crossfades& clist)
 922 {
 923         RegionLock rlock (this);
 924
 925         for (Crossfades::iterator i = _crossfades.begin(); i != _crossfades.end(); ++i) {
 926                 framepos_t const start = (*i)->position ();
 927                 framepos_t const end = start + (*i)->overlap_length(); // not length(), important difference
 928
 929                 if (frame >= start && frame <= end) {
 930                         clist.push_back (*i);
 931                 }
 932         }
 933 }
 934
 935 void
 936 AudioPlaylist::foreach_crossfade (boost::function<void (boost::shared_ptr<Crossfade>)> s)
 937 {
 938         RegionLock rl (this, false);
 939         for (Crossfades::iterator i = _crossfades.begin(); i != _crossfades.end(); ++i) {
 940                 s (*i);
 941         }
 942 }
 943
 944 void
 945 AudioPlaylist::update (const CrossfadeListProperty::ChangeRecord& change)
 946 {
 947         for (CrossfadeListProperty::ChangeContainer::const_iterator i = change.added.begin(); i != change.added.end(); ++i) {
 948                 add_crossfade (*i);
 949         }
 950
 951         /* don't remove crossfades here; they will be dealt with by the dependency code */
 952 }
 953
 954 boost::shared_ptr<Crossfade>
 955 AudioPlaylist::find_crossfade (const PBD::ID& id) const
 956 {
 957         Crossfades::const_iterator i = _crossfades.begin ();
 958         while (i != _crossfades.end() && (*i)->id() != id) {
 959                 ++i;
 960         }
 961
 962         if (i == _crossfades.end()) {
 963                 return boost::shared_ptr<Crossfade> ();
 964         }
 965
 966         return *i;
 967 }