libs/ardour/export_graph_builder.cc

   1 /*
   2   Copyright (C) 2008-2012 Paul Davis
   3   Author: Sakari Bergen
   4
   5   This program is free software; you can redistribute it and/or modify
   6   it under the terms of the GNU General Public License as published by
   7   the Free Software Foundation; either version 2 of the License, or
   8   (at your option) any later version.
   9
  10   This program is distributed in the hope that it will be useful,
  11   but WITHOUT ANY WARRANTY; without even the implied warranty of
  12   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13   GNU General Public License for more details.
  14
  15   You should have received a copy of the GNU General Public License
  16   along with this program; if not, write to the Free Software
  17   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  18
  19 */
  20
  21 #include "ardour/export_graph_builder.h"
  22
  23 #include <vector>
  24
  25 #include <glibmm/miscutils.h>
  26
  27 #include "audiographer/process_context.h"
  28 #include "audiographer/general/chunker.h"
  29 #include "audiographer/general/interleaver.h"
  30 #include "audiographer/general/normalizer.h"
  31 #include "audiographer/general/analyser.h"
  32 #include "audiographer/general/peak_reader.h"
  33 #include "audiographer/general/sample_format_converter.h"
  34 #include "audiographer/general/sr_converter.h"
  35 #include "audiographer/general/silence_trimmer.h"
  36 #include "audiographer/general/threader.h"
  37 #include "audiographer/sndfile/tmp_file.h"
  38 #include "audiographer/sndfile/sndfile_writer.h"
  39
  40 #include "ardour/audioengine.h"
  41 #include "ardour/export_channel_configuration.h"
  42 #include "ardour/export_filename.h"
  43 #include "ardour/export_format_specification.h"
  44 #include "ardour/export_timespan.h"
  45 #include "ardour/session_directory.h"
  46 #include "ardour/sndfile_helpers.h"
  47
  48 #include "pbd/file_utils.h"
  49 #include "pbd/cpus.h"
  50
  51 using namespace AudioGrapher;
  52 using std::string;
  53
  54 namespace ARDOUR {
  55
  56 ExportGraphBuilder::ExportGraphBuilder (Session const & session)
  57         : session (session)
  58         , thread_pool (hardware_concurrency())
  59 {
  60         process_buffer_frames = session.engine().samples_per_cycle();
  61 }
  62
  63 ExportGraphBuilder::~ExportGraphBuilder ()
  64 {
  65 }
  66
  67 int
  68 ExportGraphBuilder::process (framecnt_t frames, bool last_cycle)
  69 {
  70         assert(frames <= process_buffer_frames);
  71
  72         for (ChannelMap::iterator it = channels.begin(); it != channels.end(); ++it) {
  73                 Sample const * process_buffer = 0;
  74                 it->first->read (process_buffer, frames);
  75                 ConstProcessContext<Sample> context(process_buffer, frames, 1);
  76                 if (last_cycle) { context().set_flag (ProcessContext<Sample>::EndOfInput); }
  77                 it->second->process (context);
  78         }
  79
  80         return 0;
  81 }
  82
  83 bool
  84 ExportGraphBuilder::process_normalize ()
  85 {
  86         for (std::list<Normalizer *>::iterator it = normalizers.begin(); it != normalizers.end(); /* ++ in loop */) {
  87                 if ((*it)->process()) {
  88                         it = normalizers.erase (it);
  89                 } else {
  90                         ++it;
  91                 }
  92         }
  93
  94         return normalizers.empty();
  95 }
  96
  97 unsigned
  98 ExportGraphBuilder::get_normalize_cycle_count() const
  99 {
 100         unsigned max = 0;
 101         for (std::list<Normalizer *>::const_iterator it = normalizers.begin(); it != normalizers.end(); ++it) {
 102                 max = std::max(max, (*it)->get_normalize_cycle_count());
 103         }
 104         return max;
 105 }
 106
 107 void
 108 ExportGraphBuilder::reset ()
 109 {
 110         timespan.reset();
 111         channel_configs.clear ();
 112         channels.clear ();
 113         normalizers.clear ();
 114         analysis_map.clear();
 115 }
 116
 117 void
 118 ExportGraphBuilder::cleanup (bool remove_out_files/*=false*/)
 119 {
 120         ChannelConfigList::iterator iter = channel_configs.begin();
 121
 122         while (iter != channel_configs.end() ) {
 123                 iter->remove_children(remove_out_files);
 124                 iter = channel_configs.erase(iter);
 125         }
 126 }
 127
 128 void
 129 ExportGraphBuilder::set_current_timespan (boost::shared_ptr<ExportTimespan> span)
 130 {
 131         timespan = span;
 132 }
 133
 134 void
 135 ExportGraphBuilder::add_config (FileSpec const & config)
 136 {
 137         ExportChannelConfiguration::ChannelList const & channels =
 138                 config.channel_config->get_channels();
 139         for(ExportChannelConfiguration::ChannelList::const_iterator it = channels.begin();
 140             it != channels.end(); ++it) {
 141                 (*it)->set_max_buffer_size(process_buffer_frames);
 142         }
 143
 144         // If the sample rate is "session rate", change it to the real value.
 145         // However, we need to copy it to not change the config which is saved...
 146         FileSpec new_config (config);
 147         new_config.format.reset(new ExportFormatSpecification(*new_config.format, false));
 148         if(new_config.format->sample_rate() == ExportFormatBase::SR_Session) {
 149                 framecnt_t session_rate = session.nominal_frame_rate();
 150                 new_config.format->set_sample_rate(ExportFormatBase::nearest_sample_rate(session_rate));
 151         }
 152
 153
 154         if (!new_config.channel_config->get_split ()) {
 155                 add_split_config (new_config);
 156                 return;
 157         }
 158
 159         // Split channel configurations are split into several channel configurations,
 160         // each corresponding to a file, at this stage
 161         typedef std::list<boost::shared_ptr<ExportChannelConfiguration> > ConfigList;
 162         ConfigList file_configs;
 163         new_config.channel_config->configurations_for_files (file_configs);
 164
 165         unsigned chan = 1;
 166         for (ConfigList::iterator it = file_configs.begin(); it != file_configs.end(); ++it, ++chan) {
 167                 FileSpec copy = new_config;
 168                 copy.channel_config = *it;
 169
 170                 copy.filename.reset (new ExportFilename (*copy.filename));
 171                 copy.filename->include_channel = true;
 172                 copy.filename->set_channel (chan);
 173
 174                 add_split_config (copy);
 175         }
 176 }
 177
 178 void
 179 ExportGraphBuilder::get_analysis_results (AnalysisResults& results) {
 180         for (AnalysisMap::iterator i = analysis_map.begin(); i != analysis_map.end(); ++i) {
 181                 ExportAnalysisPtr p = i->second->result ();
 182                 if (p) {
 183                         results.insert (std::make_pair (i->first, p));
 184                 }
 185         }
 186 }
 187
 188 void
 189 ExportGraphBuilder::add_split_config (FileSpec const & config)
 190 {
 191         for (ChannelConfigList::iterator it = channel_configs.begin(); it != channel_configs.end(); ++it) {
 192                 if (*it == config) {
 193                         it->add_child (config);
 194                         return;
 195                 }
 196         }
 197
 198         // No duplicate channel config found, create new one
 199         channel_configs.push_back (new ChannelConfig (*this, config, channels));
 200 }
 201
 202 /* Encoder */
 203
 204 template <>
 205 boost::shared_ptr<AudioGrapher::Sink<Sample> >
 206 ExportGraphBuilder::Encoder::init (FileSpec const & new_config)
 207 {
 208         config = new_config;
 209         init_writer (float_writer);
 210         return float_writer;
 211 }
 212
 213 template <>
 214 boost::shared_ptr<AudioGrapher::Sink<int> >
 215 ExportGraphBuilder::Encoder::init (FileSpec const & new_config)
 216 {
 217         config = new_config;
 218         init_writer (int_writer);
 219         return int_writer;
 220 }
 221
 222 template <>
 223 boost::shared_ptr<AudioGrapher::Sink<short> >
 224 ExportGraphBuilder::Encoder::init (FileSpec const & new_config)
 225 {
 226         config = new_config;
 227         init_writer (short_writer);
 228         return short_writer;
 229 }
 230
 231 void
 232 ExportGraphBuilder::Encoder::add_child (FileSpec const & new_config)
 233 {
 234         filenames.push_back (new_config.filename);
 235 }
 236
 237 void
 238 ExportGraphBuilder::Encoder::destroy_writer (bool delete_out_file)
 239 {
 240         if (delete_out_file ) {
 241
 242                 if (float_writer) {
 243                         float_writer->close ();
 244                 }
 245
 246                 if (int_writer) {
 247                         int_writer->close ();
 248                 }
 249
 250                 if (short_writer) {
 251                         short_writer->close ();
 252                 }
 253
 254                 if (std::remove(writer_filename.c_str() ) != 0) {
 255                         std::cout << "Encoder::destroy_writer () : Error removing file: " << strerror(errno) << std::endl;
 256                 }
 257         }
 258
 259         float_writer.reset ();
 260         int_writer.reset ();
 261         short_writer.reset ();
 262 }
 263
 264 bool
 265 ExportGraphBuilder::Encoder::operator== (FileSpec const & other_config) const
 266 {
 267         return get_real_format (config) == get_real_format (other_config);
 268 }
 269
 270 int
 271 ExportGraphBuilder::Encoder::get_real_format (FileSpec const & config)
 272 {
 273         ExportFormatSpecification & format = *config.format;
 274         return format.format_id() | format.sample_format() | format.endianness();
 275 }
 276
 277 template<typename T>
 278 void
 279 ExportGraphBuilder::Encoder::init_writer (boost::shared_ptr<AudioGrapher::SndfileWriter<T> > & writer)
 280 {
 281         unsigned channels = config.channel_config->get_n_chans();
 282         int format = get_real_format (config);
 283         config.filename->set_channel_config(config.channel_config);
 284         writer_filename = config.filename->get_path (config.format);
 285
 286         writer.reset (new AudioGrapher::SndfileWriter<T> (writer_filename, format, channels, config.format->sample_rate(), config.broadcast_info));
 287         writer->FileWritten.connect_same_thread (copy_files_connection, boost::bind (&ExportGraphBuilder::Encoder::copy_files, this, _1));
 288 }
 289
 290 void
 291 ExportGraphBuilder::Encoder::copy_files (std::string orig_path)
 292 {
 293         while (filenames.size()) {
 294                 ExportFilenamePtr & filename = filenames.front();
 295                 PBD::copy_file (orig_path, filename->get_path (config.format).c_str());
 296                 filenames.pop_front();
 297         }
 298 }
 299
 300 /* SFC */
 301
 302 ExportGraphBuilder::SFC::SFC (ExportGraphBuilder &parent, FileSpec const & new_config, framecnt_t max_frames)
 303         : data_width(0)
 304 {
 305         config = new_config;
 306         data_width = sndfile_data_width (Encoder::get_real_format (config));
 307         unsigned channels = new_config.channel_config->get_n_chans();
 308         _analyse = config.format->analyse();
 309         if (_analyse) {
 310                 analyser.reset (new Analyser (config.format->sample_rate(), channels, max_frames,
 311                                         (framecnt_t) ceil (parent.timespan->get_length () * config.format->sample_rate () / (double) parent.session.nominal_frame_rate ())));
 312                 parent.add_analyser (config.filename->get_path (config.format), analyser);
 313         }
 314
 315         if (data_width == 8 || data_width == 16) {
 316                 short_converter = ShortConverterPtr (new SampleFormatConverter<short> (channels));
 317                 short_converter->init (max_frames, config.format->dither_type(), data_width);
 318                 add_child (config);
 319                 if (_analyse) { analyser->add_output (short_converter); }
 320
 321         } else if (data_width == 24 || data_width == 32) {
 322                 int_converter = IntConverterPtr (new SampleFormatConverter<int> (channels));
 323                 int_converter->init (max_frames, config.format->dither_type(), data_width);
 324                 add_child (config);
 325                 if (_analyse) { analyser->add_output (int_converter); }
 326         } else {
 327                 int actual_data_width = 8 * sizeof(Sample);
 328                 float_converter = FloatConverterPtr (new SampleFormatConverter<Sample> (channels));
 329                 float_converter->init (max_frames, config.format->dither_type(), actual_data_width);
 330                 add_child (config);
 331                 if (_analyse) { analyser->add_output (float_converter); }
 332         }
 333 }
 334
 335 void
 336 ExportGraphBuilder::SFC::set_peak (float gain)
 337 {
 338         if (_analyse) {
 339                 analyser->set_normalization_gain (gain);
 340         }
 341 }
 342
 343 ExportGraphBuilder::FloatSinkPtr
 344 ExportGraphBuilder::SFC::sink ()
 345 {
 346         if (_analyse) {
 347                 return analyser;
 348         } else if (data_width == 8 || data_width == 16) {
 349                 return short_converter;
 350         } else if (data_width == 24 || data_width == 32) {
 351                 return int_converter;
 352         } else {
 353                 return float_converter;
 354         }
 355 }
 356
 357 void
 358 ExportGraphBuilder::SFC::add_child (FileSpec const & new_config)
 359 {
 360         for (boost::ptr_list<Encoder>::iterator it = children.begin(); it != children.end(); ++it) {
 361                 if (*it == new_config) {
 362                         it->add_child (new_config);
 363                         return;
 364                 }
 365         }
 366
 367         children.push_back (new Encoder());
 368         Encoder & encoder = children.back();
 369
 370         if (data_width == 8 || data_width == 16) {
 371                 short_converter->add_output (encoder.init<short> (new_config));
 372         } else if (data_width == 24 || data_width == 32) {
 373                 int_converter->add_output (encoder.init<int> (new_config));
 374         } else {
 375                 float_converter->add_output (encoder.init<Sample> (new_config));
 376         }
 377 }
 378
 379 void
 380 ExportGraphBuilder::SFC::remove_children (bool remove_out_files)
 381 {
 382         boost::ptr_list<Encoder>::iterator iter = children.begin ();
 383
 384         while (iter != children.end() ) {
 385
 386                 if (remove_out_files) {
 387                         iter->destroy_writer(remove_out_files);
 388                 }
 389                 iter = children.erase (iter);
 390         }
 391 }
 392
 393 bool
 394 ExportGraphBuilder::SFC::operator== (FileSpec const & other_config) const
 395 {
 396         return config.format->sample_format() == other_config.format->sample_format();
 397 }
 398
 399 /* Normalizer */
 400
 401 ExportGraphBuilder::Normalizer::Normalizer (ExportGraphBuilder & parent, FileSpec const & new_config, framecnt_t /*max_frames*/)
 402         : parent (parent)
 403 {
 404         std::string tmpfile_path = parent.session.session_directory().export_path();
 405         tmpfile_path = Glib::build_filename(tmpfile_path, "XXXXXX");
 406         std::vector<char> tmpfile_path_buf(tmpfile_path.size() + 1);
 407         std::copy(tmpfile_path.begin(), tmpfile_path.end(), tmpfile_path_buf.begin());
 408         tmpfile_path_buf[tmpfile_path.size()] = '\0';
 409
 410         config = new_config;
 411         uint32_t const channels = config.channel_config->get_n_chans();
 412         max_frames_out = 4086 - (4086 % channels); // TODO good chunk size
 413
 414         buffer.reset (new AllocatingProcessContext<Sample> (max_frames_out, channels));
 415         peak_reader.reset (new PeakReader ());
 416         normalizer.reset (new AudioGrapher::Normalizer (config.format->normalize_target()));
 417         threader.reset (new Threader<Sample> (parent.thread_pool));
 418
 419         normalizer->alloc_buffer (max_frames_out);
 420         normalizer->add_output (threader);
 421
 422         int format = ExportFormatBase::F_RAW | ExportFormatBase::SF_Float;
 423         tmp_file.reset (new TmpFile<float> (&tmpfile_path_buf[0], format, channels, config.format->sample_rate()));
 424         tmp_file->FileWritten.connect_same_thread (post_processing_connection,
 425                                                    boost::bind (&Normalizer::start_post_processing, this));
 426
 427         add_child (new_config);
 428
 429         peak_reader->add_output (tmp_file);
 430 }
 431
 432 ExportGraphBuilder::FloatSinkPtr
 433 ExportGraphBuilder::Normalizer::sink ()
 434 {
 435         return peak_reader;
 436 }
 437
 438 void
 439 ExportGraphBuilder::Normalizer::add_child (FileSpec const & new_config)
 440 {
 441         for (boost::ptr_list<SFC>::iterator it = children.begin(); it != children.end(); ++it) {
 442                 if (*it == new_config) {
 443                         it->add_child (new_config);
 444                         return;
 445                 }
 446         }
 447
 448         children.push_back (new SFC (parent, new_config, max_frames_out));
 449         threader->add_output (children.back().sink());
 450 }
 451
 452 void
 453 ExportGraphBuilder::Normalizer::remove_children (bool remove_out_files)
 454 {
 455         boost::ptr_list<SFC>::iterator iter = children.begin ();
 456
 457         while (iter != children.end() ) {
 458                 iter->remove_children (remove_out_files);
 459                 iter = children.erase (iter);
 460         }
 461 }
 462
 463 bool
 464 ExportGraphBuilder::Normalizer::operator== (FileSpec const & other_config) const
 465 {
 466         return config.format->normalize() == other_config.format->normalize() &&
 467                 config.format->normalize_target() == other_config.format->normalize_target();
 468 }
 469
 470 unsigned
 471 ExportGraphBuilder::Normalizer::get_normalize_cycle_count() const
 472 {
 473         return static_cast<unsigned>(std::ceil(static_cast<float>(tmp_file->get_frames_written()) /
 474                                                max_frames_out));
 475 }
 476
 477 bool
 478 ExportGraphBuilder::Normalizer::process()
 479 {
 480         framecnt_t frames_read = tmp_file->read (*buffer);
 481         return frames_read != buffer->frames();
 482 }
 483
 484 void
 485 ExportGraphBuilder::Normalizer::start_post_processing()
 486 {
 487         const float gain = normalizer->set_peak (peak_reader->get_peak());
 488         for (boost::ptr_list<SFC>::iterator i = children.begin(); i != children.end(); ++i) {
 489                 (*i).set_peak (gain);
 490         }
 491         tmp_file->seek (0, SEEK_SET);
 492         tmp_file->add_output (normalizer);
 493         parent.normalizers.push_back (this);
 494 }
 495
 496 /* SRC */
 497
 498 ExportGraphBuilder::SRC::SRC (ExportGraphBuilder & parent, FileSpec const & new_config, framecnt_t max_frames)
 499         : parent (parent)
 500 {
 501         config = new_config;
 502         converter.reset (new SampleRateConverter (new_config.channel_config->get_n_chans()));
 503         ExportFormatSpecification & format = *new_config.format;
 504         converter->init (parent.session.nominal_frame_rate(), format.sample_rate(), format.src_quality());
 505         max_frames_out = converter->allocate_buffers (max_frames);
 506
 507         add_child (new_config);
 508 }
 509
 510 ExportGraphBuilder::FloatSinkPtr
 511 ExportGraphBuilder::SRC::sink ()
 512 {
 513         return converter;
 514 }
 515
 516 void
 517 ExportGraphBuilder::SRC::add_child (FileSpec const & new_config)
 518 {
 519         if (new_config.format->normalize()) {
 520                 add_child_to_list (new_config, normalized_children);
 521         } else {
 522                 add_child_to_list (new_config, children);
 523         }
 524 }
 525
 526 void
 527 ExportGraphBuilder::SRC::remove_children (bool remove_out_files)
 528 {
 529         boost::ptr_list<SFC>::iterator sfc_iter = children.begin();
 530
 531         while (sfc_iter != children.end() ) {
 532                 converter->remove_output (sfc_iter->sink() );
 533                 sfc_iter->remove_children (remove_out_files);
 534                 sfc_iter = children.erase (sfc_iter);
 535         }
 536
 537         boost::ptr_list<Normalizer>::iterator norm_iter = normalized_children.begin();
 538
 539         while (norm_iter != normalized_children.end() ) {
 540                 converter->remove_output (norm_iter->sink() );
 541                 norm_iter->remove_children (remove_out_files);
 542                 norm_iter = normalized_children.erase (norm_iter);
 543         }
 544
 545 }
 546
 547 template<typename T>
 548 void
 549 ExportGraphBuilder::SRC::add_child_to_list (FileSpec const & new_config, boost::ptr_list<T> & list)
 550 {
 551         for (typename boost::ptr_list<T>::iterator it = list.begin(); it != list.end(); ++it) {
 552                 if (*it == new_config) {
 553                         it->add_child (new_config);
 554                         return;
 555                 }
 556         }
 557
 558         list.push_back (new T (parent, new_config, max_frames_out));
 559         converter->add_output (list.back().sink ());
 560 }
 561
 562 bool
 563 ExportGraphBuilder::SRC::operator== (FileSpec const & other_config) const
 564 {
 565         return config.format->sample_rate() == other_config.format->sample_rate();
 566 }
 567
 568 /* SilenceHandler */
 569 ExportGraphBuilder::SilenceHandler::SilenceHandler (ExportGraphBuilder & parent, FileSpec const & new_config, framecnt_t max_frames)
 570         : parent (parent)
 571 {
 572         config = new_config;
 573         max_frames_in = max_frames;
 574         framecnt_t sample_rate = parent.session.nominal_frame_rate();
 575
 576         silence_trimmer.reset (new SilenceTrimmer<Sample>(max_frames_in));
 577         silence_trimmer->set_trim_beginning (config.format->trim_beginning());
 578         silence_trimmer->set_trim_end (config.format->trim_end());
 579
 580         framecnt_t sb = config.format->silence_beginning_at (parent.timespan->get_start(), sample_rate);
 581         framecnt_t se = config.format->silence_end_at (parent.timespan->get_end(), sample_rate);
 582
 583         silence_trimmer->add_silence_to_beginning (sb);
 584         silence_trimmer->add_silence_to_end (se);
 585
 586         add_child (new_config);
 587 }
 588
 589 ExportGraphBuilder::FloatSinkPtr
 590 ExportGraphBuilder::SilenceHandler::sink ()
 591 {
 592         return silence_trimmer;
 593 }
 594
 595 void
 596 ExportGraphBuilder::SilenceHandler::add_child (FileSpec const & new_config)
 597 {
 598         for (boost::ptr_list<SRC>::iterator it = children.begin(); it != children.end(); ++it) {
 599                 if (*it == new_config) {
 600                         it->add_child (new_config);
 601                         return;
 602                 }
 603         }
 604
 605         children.push_back (new SRC (parent, new_config, max_frames_in));
 606         silence_trimmer->add_output (children.back().sink());
 607 }
 608
 609 void
 610 ExportGraphBuilder::SilenceHandler::remove_children (bool remove_out_files)
 611 {
 612         boost::ptr_list<SRC>::iterator iter = children.begin();
 613
 614         while (iter != children.end() ) {
 615                 silence_trimmer->remove_output (iter->sink() );
 616                 iter->remove_children (remove_out_files);
 617                 iter = children.erase (iter);
 618         }
 619 }
 620
 621 bool
 622 ExportGraphBuilder::SilenceHandler::operator== (FileSpec const & other_config) const
 623 {
 624         ExportFormatSpecification & format = *config.format;
 625         ExportFormatSpecification & other_format = *other_config.format;
 626         return (format.trim_beginning() == other_format.trim_beginning()) &&
 627                 (format.trim_end() == other_format.trim_end()) &&
 628                 (format.silence_beginning_time() == other_format.silence_beginning_time()) &&
 629                 (format.silence_end_time() == other_format.silence_end_time());
 630 }
 631
 632 /* ChannelConfig */
 633
 634 ExportGraphBuilder::ChannelConfig::ChannelConfig (ExportGraphBuilder & parent, FileSpec const & new_config, ChannelMap & channel_map)
 635         : parent (parent)
 636 {
 637         typedef ExportChannelConfiguration::ChannelList ChannelList;
 638
 639         config = new_config;
 640
 641         framecnt_t max_frames = parent.session.engine().samples_per_cycle();
 642         interleaver.reset (new Interleaver<Sample> ());
 643         interleaver->init (new_config.channel_config->get_n_chans(), max_frames);
 644
 645         // Make the chunk size divisible by the channel count
 646         int chan_count = new_config.channel_config->get_n_chans();
 647         max_frames_out = 8192;
 648         if (chan_count > 0) {
 649                 max_frames_out -= max_frames_out % chan_count;
 650         }
 651         chunker.reset (new Chunker<Sample> (max_frames_out));
 652         interleaver->add_output(chunker);
 653
 654         ChannelList const & channel_list = config.channel_config->get_channels();
 655         unsigned chan = 0;
 656         for (ChannelList::const_iterator it = channel_list.begin(); it != channel_list.end(); ++it, ++chan) {
 657                 ChannelMap::iterator map_it = channel_map.find (*it);
 658                 if (map_it == channel_map.end()) {
 659                         std::pair<ChannelMap::iterator, bool> result_pair =
 660                                 channel_map.insert (std::make_pair (*it, IdentityVertexPtr (new IdentityVertex<Sample> ())));
 661                         assert (result_pair.second);
 662                         map_it = result_pair.first;
 663                 }
 664                 map_it->second->add_output (interleaver->input (chan));
 665         }
 666
 667         add_child (new_config);
 668 }
 669
 670 void
 671 ExportGraphBuilder::ChannelConfig::add_child (FileSpec const & new_config)
 672 {
 673         assert (*this == new_config);
 674
 675         for (boost::ptr_list<SilenceHandler>::iterator it = children.begin(); it != children.end(); ++it) {
 676                 if (*it == new_config) {
 677                         it->add_child (new_config);
 678                         return;
 679                 }
 680         }
 681
 682         children.push_back (new SilenceHandler (parent, new_config, max_frames_out));
 683         chunker->add_output (children.back().sink ());
 684 }
 685
 686 void
 687 ExportGraphBuilder::ChannelConfig::remove_children (bool remove_out_files)
 688 {
 689         boost::ptr_list<SilenceHandler>::iterator iter = children.begin();
 690
 691         while(iter != children.end() ) {
 692
 693                 chunker->remove_output (iter->sink ());
 694                 iter->remove_children (remove_out_files);
 695                 iter = children.erase(iter);
 696         }
 697 }
 698
 699 bool
 700 ExportGraphBuilder::ChannelConfig::operator== (FileSpec const & other_config) const
 701 {
 702         return config.channel_config == other_config.channel_config;
 703 }
 704
 705 } // namespace ARDOUR