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