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                 framecnt_t sample_rate = parent.session.nominal_frame_rate();
 311                 framecnt_t sb = config.format->silence_beginning_at (parent.timespan->get_start(), sample_rate);
 312                 framecnt_t se = config.format->silence_end_at (parent.timespan->get_end(), sample_rate);
 313                 framecnt_t duration = parent.timespan->get_length () + sb + se;
 314                 max_frames = min ((framecnt_t) 8192 * channels, max ((framecnt_t) 4096 * channels, max_frames));
 315                 chunker.reset (new Chunker<Sample> (max_frames));
 316                 analyser.reset (new Analyser (config.format->sample_rate(), channels, max_frames,
 317                                         (framecnt_t) ceil (duration * config.format->sample_rate () / (double) sample_rate)));
 318                 chunker->add_output (analyser);
 319                 parent.add_analyser (config.filename->get_path (config.format), analyser);
 320         }
 321
 322         if (data_width == 8 || data_width == 16) {
 323                 short_converter = ShortConverterPtr (new SampleFormatConverter<short> (channels));
 324                 short_converter->init (max_frames, config.format->dither_type(), data_width);
 325                 add_child (config);
 326                 if (_analyse) { analyser->add_output (short_converter); }
 327
 328         } else if (data_width == 24 || data_width == 32) {
 329                 int_converter = IntConverterPtr (new SampleFormatConverter<int> (channels));
 330                 int_converter->init (max_frames, config.format->dither_type(), data_width);
 331                 add_child (config);
 332                 if (_analyse) { analyser->add_output (int_converter); }
 333         } else {
 334                 int actual_data_width = 8 * sizeof(Sample);
 335                 float_converter = FloatConverterPtr (new SampleFormatConverter<Sample> (channels));
 336                 float_converter->init (max_frames, config.format->dither_type(), actual_data_width);
 337                 add_child (config);
 338                 if (_analyse) { analyser->add_output (float_converter); }
 339         }
 340 }
 341
 342 void
 343 ExportGraphBuilder::SFC::set_peak (float gain)
 344 {
 345         if (_analyse) {
 346                 analyser->set_normalization_gain (gain);
 347         }
 348 }
 349
 350 ExportGraphBuilder::FloatSinkPtr
 351 ExportGraphBuilder::SFC::sink ()
 352 {
 353         if (_analyse) {
 354                 return chunker;
 355         } else if (data_width == 8 || data_width == 16) {
 356                 return short_converter;
 357         } else if (data_width == 24 || data_width == 32) {
 358                 return int_converter;
 359         } else {
 360                 return float_converter;
 361         }
 362 }
 363
 364 void
 365 ExportGraphBuilder::SFC::add_child (FileSpec const & new_config)
 366 {
 367         for (boost::ptr_list<Encoder>::iterator it = children.begin(); it != children.end(); ++it) {
 368                 if (*it == new_config) {
 369                         it->add_child (new_config);
 370                         return;
 371                 }
 372         }
 373
 374         children.push_back (new Encoder());
 375         Encoder & encoder = children.back();
 376
 377         if (data_width == 8 || data_width == 16) {
 378                 short_converter->add_output (encoder.init<short> (new_config));
 379         } else if (data_width == 24 || data_width == 32) {
 380                 int_converter->add_output (encoder.init<int> (new_config));
 381         } else {
 382                 float_converter->add_output (encoder.init<Sample> (new_config));
 383         }
 384 }
 385
 386 void
 387 ExportGraphBuilder::SFC::remove_children (bool remove_out_files)
 388 {
 389         boost::ptr_list<Encoder>::iterator iter = children.begin ();
 390
 391         while (iter != children.end() ) {
 392
 393                 if (remove_out_files) {
 394                         iter->destroy_writer(remove_out_files);
 395                 }
 396                 iter = children.erase (iter);
 397         }
 398 }
 399
 400 bool
 401 ExportGraphBuilder::SFC::operator== (FileSpec const & other_config) const
 402 {
 403         return config.format->sample_format() == other_config.format->sample_format();
 404 }
 405
 406 /* Normalizer */
 407
 408 ExportGraphBuilder::Normalizer::Normalizer (ExportGraphBuilder & parent, FileSpec const & new_config, framecnt_t /*max_frames*/)
 409         : parent (parent)
 410 {
 411         std::string tmpfile_path = parent.session.session_directory().export_path();
 412         tmpfile_path = Glib::build_filename(tmpfile_path, "XXXXXX");
 413         std::vector<char> tmpfile_path_buf(tmpfile_path.size() + 1);
 414         std::copy(tmpfile_path.begin(), tmpfile_path.end(), tmpfile_path_buf.begin());
 415         tmpfile_path_buf[tmpfile_path.size()] = '\0';
 416
 417         config = new_config;
 418         uint32_t const channels = config.channel_config->get_n_chans();
 419         max_frames_out = 4086 - (4086 % channels); // TODO good chunk size
 420
 421         buffer.reset (new AllocatingProcessContext<Sample> (max_frames_out, channels));
 422         peak_reader.reset (new PeakReader ());
 423         normalizer.reset (new AudioGrapher::Normalizer (config.format->normalize_target()));
 424         threader.reset (new Threader<Sample> (parent.thread_pool));
 425
 426         normalizer->alloc_buffer (max_frames_out);
 427         normalizer->add_output (threader);
 428
 429         int format = ExportFormatBase::F_RAW | ExportFormatBase::SF_Float;
 430         tmp_file.reset (new TmpFile<float> (&tmpfile_path_buf[0], format, channels, config.format->sample_rate()));
 431         tmp_file->FileWritten.connect_same_thread (post_processing_connection,
 432                                                    boost::bind (&Normalizer::start_post_processing, this));
 433
 434         add_child (new_config);
 435
 436         peak_reader->add_output (tmp_file);
 437 }
 438
 439 ExportGraphBuilder::FloatSinkPtr
 440 ExportGraphBuilder::Normalizer::sink ()
 441 {
 442         return peak_reader;
 443 }
 444
 445 void
 446 ExportGraphBuilder::Normalizer::add_child (FileSpec const & new_config)
 447 {
 448         for (boost::ptr_list<SFC>::iterator it = children.begin(); it != children.end(); ++it) {
 449                 if (*it == new_config) {
 450                         it->add_child (new_config);
 451                         return;
 452                 }
 453         }
 454
 455         children.push_back (new SFC (parent, new_config, max_frames_out));
 456         threader->add_output (children.back().sink());
 457 }
 458
 459 void
 460 ExportGraphBuilder::Normalizer::remove_children (bool remove_out_files)
 461 {
 462         boost::ptr_list<SFC>::iterator iter = children.begin ();
 463
 464         while (iter != children.end() ) {
 465                 iter->remove_children (remove_out_files);
 466                 iter = children.erase (iter);
 467         }
 468 }
 469
 470 bool
 471 ExportGraphBuilder::Normalizer::operator== (FileSpec const & other_config) const
 472 {
 473         return config.format->normalize() == other_config.format->normalize() &&
 474                 config.format->normalize_target() == other_config.format->normalize_target();
 475 }
 476
 477 unsigned
 478 ExportGraphBuilder::Normalizer::get_normalize_cycle_count() const
 479 {
 480         return static_cast<unsigned>(std::ceil(static_cast<float>(tmp_file->get_frames_written()) /
 481                                                max_frames_out));
 482 }
 483
 484 bool
 485 ExportGraphBuilder::Normalizer::process()
 486 {
 487         framecnt_t frames_read = tmp_file->read (*buffer);
 488         return frames_read != buffer->frames();
 489 }
 490
 491 void
 492 ExportGraphBuilder::Normalizer::start_post_processing()
 493 {
 494         const float gain = normalizer->set_peak (peak_reader->get_peak());
 495         for (boost::ptr_list<SFC>::iterator i = children.begin(); i != children.end(); ++i) {
 496                 (*i).set_peak (gain);
 497         }
 498         tmp_file->seek (0, SEEK_SET);
 499         tmp_file->add_output (normalizer);
 500         parent.normalizers.push_back (this);
 501 }
 502
 503 /* SRC */
 504
 505 ExportGraphBuilder::SRC::SRC (ExportGraphBuilder & parent, FileSpec const & new_config, framecnt_t max_frames)
 506         : parent (parent)
 507 {
 508         config = new_config;
 509         converter.reset (new SampleRateConverter (new_config.channel_config->get_n_chans()));
 510         ExportFormatSpecification & format = *new_config.format;
 511         converter->init (parent.session.nominal_frame_rate(), format.sample_rate(), format.src_quality());
 512         max_frames_out = converter->allocate_buffers (max_frames);
 513
 514         add_child (new_config);
 515 }
 516
 517 ExportGraphBuilder::FloatSinkPtr
 518 ExportGraphBuilder::SRC::sink ()
 519 {
 520         return converter;
 521 }
 522
 523 void
 524 ExportGraphBuilder::SRC::add_child (FileSpec const & new_config)
 525 {
 526         if (new_config.format->normalize()) {
 527                 add_child_to_list (new_config, normalized_children);
 528         } else {
 529                 add_child_to_list (new_config, children);
 530         }
 531 }
 532
 533 void
 534 ExportGraphBuilder::SRC::remove_children (bool remove_out_files)
 535 {
 536         boost::ptr_list<SFC>::iterator sfc_iter = children.begin();
 537
 538         while (sfc_iter != children.end() ) {
 539                 converter->remove_output (sfc_iter->sink() );
 540                 sfc_iter->remove_children (remove_out_files);
 541                 sfc_iter = children.erase (sfc_iter);
 542         }
 543
 544         boost::ptr_list<Normalizer>::iterator norm_iter = normalized_children.begin();
 545
 546         while (norm_iter != normalized_children.end() ) {
 547                 converter->remove_output (norm_iter->sink() );
 548                 norm_iter->remove_children (remove_out_files);
 549                 norm_iter = normalized_children.erase (norm_iter);
 550         }
 551
 552 }
 553
 554 template<typename T>
 555 void
 556 ExportGraphBuilder::SRC::add_child_to_list (FileSpec const & new_config, boost::ptr_list<T> & list)
 557 {
 558         for (typename boost::ptr_list<T>::iterator it = list.begin(); it != list.end(); ++it) {
 559                 if (*it == new_config) {
 560                         it->add_child (new_config);
 561                         return;
 562                 }
 563         }
 564
 565         list.push_back (new T (parent, new_config, max_frames_out));
 566         converter->add_output (list.back().sink ());
 567 }
 568
 569 bool
 570 ExportGraphBuilder::SRC::operator== (FileSpec const & other_config) const
 571 {
 572         return config.format->sample_rate() == other_config.format->sample_rate();
 573 }
 574
 575 /* SilenceHandler */
 576 ExportGraphBuilder::SilenceHandler::SilenceHandler (ExportGraphBuilder & parent, FileSpec const & new_config, framecnt_t max_frames)
 577         : parent (parent)
 578 {
 579         config = new_config;
 580         max_frames_in = max_frames;
 581         framecnt_t sample_rate = parent.session.nominal_frame_rate();
 582
 583         // TODO silence-threshold should be per export-preset, with Config->get_silence_threshold being the default
 584         silence_trimmer.reset (new SilenceTrimmer<Sample>(max_frames_in, Config->get_export_silence_threshold ()));
 585         silence_trimmer->set_trim_beginning (config.format->trim_beginning());
 586         silence_trimmer->set_trim_end (config.format->trim_end());
 587
 588         framecnt_t sb = config.format->silence_beginning_at (parent.timespan->get_start(), sample_rate);
 589         framecnt_t se = config.format->silence_end_at (parent.timespan->get_end(), sample_rate);
 590
 591         silence_trimmer->add_silence_to_beginning (sb);
 592         silence_trimmer->add_silence_to_end (se);
 593
 594         add_child (new_config);
 595 }
 596
 597 ExportGraphBuilder::FloatSinkPtr
 598 ExportGraphBuilder::SilenceHandler::sink ()
 599 {
 600         return silence_trimmer;
 601 }
 602
 603 void
 604 ExportGraphBuilder::SilenceHandler::add_child (FileSpec const & new_config)
 605 {
 606         for (boost::ptr_list<SRC>::iterator it = children.begin(); it != children.end(); ++it) {
 607                 if (*it == new_config) {
 608                         it->add_child (new_config);
 609                         return;
 610                 }
 611         }
 612
 613         children.push_back (new SRC (parent, new_config, max_frames_in));
 614         silence_trimmer->add_output (children.back().sink());
 615 }
 616
 617 void
 618 ExportGraphBuilder::SilenceHandler::remove_children (bool remove_out_files)
 619 {
 620         boost::ptr_list<SRC>::iterator iter = children.begin();
 621
 622         while (iter != children.end() ) {
 623                 silence_trimmer->remove_output (iter->sink() );
 624                 iter->remove_children (remove_out_files);
 625                 iter = children.erase (iter);
 626         }
 627 }
 628
 629 bool
 630 ExportGraphBuilder::SilenceHandler::operator== (FileSpec const & other_config) const
 631 {
 632         ExportFormatSpecification & format = *config.format;
 633         ExportFormatSpecification & other_format = *other_config.format;
 634         return (format.trim_beginning() == other_format.trim_beginning()) &&
 635                 (format.trim_end() == other_format.trim_end()) &&
 636                 (format.silence_beginning_time() == other_format.silence_beginning_time()) &&
 637                 (format.silence_end_time() == other_format.silence_end_time());
 638 }
 639
 640 /* ChannelConfig */
 641
 642 ExportGraphBuilder::ChannelConfig::ChannelConfig (ExportGraphBuilder & parent, FileSpec const & new_config, ChannelMap & channel_map)
 643         : parent (parent)
 644 {
 645         typedef ExportChannelConfiguration::ChannelList ChannelList;
 646
 647         config = new_config;
 648
 649         framecnt_t max_frames = parent.session.engine().samples_per_cycle();
 650         interleaver.reset (new Interleaver<Sample> ());
 651         interleaver->init (new_config.channel_config->get_n_chans(), max_frames);
 652
 653         // Make the chunk size divisible by the channel count
 654         int chan_count = new_config.channel_config->get_n_chans();
 655         max_frames_out = 8192;
 656         if (chan_count > 0) {
 657                 max_frames_out -= max_frames_out % chan_count;
 658         }
 659         chunker.reset (new Chunker<Sample> (max_frames_out));
 660         interleaver->add_output(chunker);
 661
 662         ChannelList const & channel_list = config.channel_config->get_channels();
 663         unsigned chan = 0;
 664         for (ChannelList::const_iterator it = channel_list.begin(); it != channel_list.end(); ++it, ++chan) {
 665                 ChannelMap::iterator map_it = channel_map.find (*it);
 666                 if (map_it == channel_map.end()) {
 667                         std::pair<ChannelMap::iterator, bool> result_pair =
 668                                 channel_map.insert (std::make_pair (*it, IdentityVertexPtr (new IdentityVertex<Sample> ())));
 669                         assert (result_pair.second);
 670                         map_it = result_pair.first;
 671                 }
 672                 map_it->second->add_output (interleaver->input (chan));
 673         }
 674
 675         add_child (new_config);
 676 }
 677
 678 void
 679 ExportGraphBuilder::ChannelConfig::add_child (FileSpec const & new_config)
 680 {
 681         assert (*this == new_config);
 682
 683         for (boost::ptr_list<SilenceHandler>::iterator it = children.begin(); it != children.end(); ++it) {
 684                 if (*it == new_config) {
 685                         it->add_child (new_config);
 686                         return;
 687                 }
 688         }
 689
 690         children.push_back (new SilenceHandler (parent, new_config, max_frames_out));
 691         chunker->add_output (children.back().sink ());
 692 }
 693
 694 void
 695 ExportGraphBuilder::ChannelConfig::remove_children (bool remove_out_files)
 696 {
 697         boost::ptr_list<SilenceHandler>::iterator iter = children.begin();
 698
 699         while(iter != children.end() ) {
 700
 701                 chunker->remove_output (iter->sink ());
 702                 iter->remove_children (remove_out_files);
 703                 iter = children.erase(iter);
 704         }
 705 }
 706
 707 bool
 708 ExportGraphBuilder::ChannelConfig::operator== (FileSpec const & other_config) const
 709 {
 710         return config.channel_config == other_config.channel_config;
 711 }
 712
 713 } // namespace ARDOUR