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/loudness_reader.h"
  34 #include "audiographer/general/sample_format_converter.h"
  35 #include "audiographer/general/sr_converter.h"
  36 #include "audiographer/general/silence_trimmer.h"
  37 #include "audiographer/general/threader.h"
  38 #include "audiographer/sndfile/tmp_file.h"
  39 #include "audiographer/sndfile/sndfile_writer.h"
  40
  41 #include "ardour/audioengine.h"
  42 #include "ardour/export_channel_configuration.h"
  43 #include "ardour/export_filename.h"
  44 #include "ardour/export_format_specification.h"
  45 #include "ardour/export_timespan.h"
  46 #include "ardour/session_directory.h"
  47 #include "ardour/sndfile_helpers.h"
  48
  49 #include "pbd/file_utils.h"
  50 #include "pbd/cpus.h"
  51
  52 using namespace AudioGrapher;
  53 using std::string;
  54
  55 namespace ARDOUR {
  56
  57 ExportGraphBuilder::ExportGraphBuilder (Session const & session)
  58         : session (session)
  59         , thread_pool (hardware_concurrency())
  60 {
  61         process_buffer_frames = session.engine().samples_per_cycle();
  62 }
  63
  64 ExportGraphBuilder::~ExportGraphBuilder ()
  65 {
  66 }
  67
  68 int
  69 ExportGraphBuilder::process (framecnt_t frames, bool last_cycle)
  70 {
  71         assert(frames <= process_buffer_frames);
  72
  73         for (ChannelMap::iterator it = channels.begin(); it != channels.end(); ++it) {
  74                 Sample const * process_buffer = 0;
  75                 it->first->read (process_buffer, frames);
  76                 ConstProcessContext<Sample> context(process_buffer, frames, 1);
  77                 if (last_cycle) { context().set_flag (ProcessContext<Sample>::EndOfInput); }
  78                 it->second->process (context);
  79         }
  80
  81         return 0;
  82 }
  83
  84 bool
  85 ExportGraphBuilder::process_normalize ()
  86 {
  87         for (std::list<Normalizer *>::iterator it = normalizers.begin(); it != normalizers.end(); /* ++ in loop */) {
  88                 if ((*it)->process()) {
  89                         it = normalizers.erase (it);
  90                 } else {
  91                         ++it;
  92                 }
  93         }
  94
  95         return normalizers.empty();
  96 }
  97
  98 unsigned
  99 ExportGraphBuilder::get_normalize_cycle_count() const
 100 {
 101         unsigned max = 0;
 102         for (std::list<Normalizer *>::const_iterator it = normalizers.begin(); it != normalizers.end(); ++it) {
 103                 max = std::max(max, (*it)->get_normalize_cycle_count());
 104         }
 105         return max;
 106 }
 107
 108 void
 109 ExportGraphBuilder::reset ()
 110 {
 111         timespan.reset();
 112         channel_configs.clear ();
 113         channels.clear ();
 114         normalizers.clear ();
 115         analysis_map.clear();
 116 }
 117
 118 void
 119 ExportGraphBuilder::cleanup (bool remove_out_files/*=false*/)
 120 {
 121         ChannelConfigList::iterator iter = channel_configs.begin();
 122
 123         while (iter != channel_configs.end() ) {
 124                 iter->remove_children(remove_out_files);
 125                 iter = channel_configs.erase(iter);
 126         }
 127 }
 128
 129 void
 130 ExportGraphBuilder::set_current_timespan (boost::shared_ptr<ExportTimespan> span)
 131 {
 132         timespan = span;
 133 }
 134
 135 void
 136 ExportGraphBuilder::add_config (FileSpec const & config)
 137 {
 138         ExportChannelConfiguration::ChannelList const & channels =
 139                 config.channel_config->get_channels();
 140         for(ExportChannelConfiguration::ChannelList::const_iterator it = channels.begin();
 141             it != channels.end(); ++it) {
 142                 (*it)->set_max_buffer_size(process_buffer_frames);
 143         }
 144
 145         // If the sample rate is "session rate", change it to the real value.
 146         // However, we need to copy it to not change the config which is saved...
 147         FileSpec new_config (config);
 148         new_config.format.reset(new ExportFormatSpecification(*new_config.format, false));
 149         if(new_config.format->sample_rate() == ExportFormatBase::SR_Session) {
 150                 framecnt_t session_rate = session.nominal_frame_rate();
 151                 new_config.format->set_sample_rate(ExportFormatBase::nearest_sample_rate(session_rate));
 152         }
 153
 154
 155         if (!new_config.channel_config->get_split ()) {
 156                 add_split_config (new_config);
 157                 return;
 158         }
 159
 160         // Split channel configurations are split into several channel configurations,
 161         // each corresponding to a file, at this stage
 162         typedef std::list<boost::shared_ptr<ExportChannelConfiguration> > ConfigList;
 163         ConfigList file_configs;
 164         new_config.channel_config->configurations_for_files (file_configs);
 165
 166         unsigned chan = 1;
 167         for (ConfigList::iterator it = file_configs.begin(); it != file_configs.end(); ++it, ++chan) {
 168                 FileSpec copy = new_config;
 169                 copy.channel_config = *it;
 170
 171                 copy.filename.reset (new ExportFilename (*copy.filename));
 172                 copy.filename->include_channel = true;
 173                 copy.filename->set_channel (chan);
 174
 175                 add_split_config (copy);
 176         }
 177 }
 178
 179 void
 180 ExportGraphBuilder::get_analysis_results (AnalysisResults& results) {
 181         for (AnalysisMap::iterator i = analysis_map.begin(); i != analysis_map.end(); ++i) {
 182                 ExportAnalysisPtr p = i->second->result ();
 183                 if (p) {
 184                         results.insert (std::make_pair (i->first, p));
 185                 }
 186         }
 187 }
 188
 189 void
 190 ExportGraphBuilder::add_split_config (FileSpec const & config)
 191 {
 192         for (ChannelConfigList::iterator it = channel_configs.begin(); it != channel_configs.end(); ++it) {
 193                 if (*it == config) {
 194                         it->add_child (config);
 195                         return;
 196                 }
 197         }
 198
 199         // No duplicate channel config found, create new one
 200         channel_configs.push_back (new ChannelConfig (*this, config, channels));
 201 }
 202
 203 /* Encoder */
 204
 205 template <>
 206 boost::shared_ptr<AudioGrapher::Sink<Sample> >
 207 ExportGraphBuilder::Encoder::init (FileSpec const & new_config)
 208 {
 209         config = new_config;
 210         init_writer (float_writer);
 211         return float_writer;
 212 }
 213
 214 template <>
 215 boost::shared_ptr<AudioGrapher::Sink<int> >
 216 ExportGraphBuilder::Encoder::init (FileSpec const & new_config)
 217 {
 218         config = new_config;
 219         init_writer (int_writer);
 220         return int_writer;
 221 }
 222
 223 template <>
 224 boost::shared_ptr<AudioGrapher::Sink<short> >
 225 ExportGraphBuilder::Encoder::init (FileSpec const & new_config)
 226 {
 227         config = new_config;
 228         init_writer (short_writer);
 229         return short_writer;
 230 }
 231
 232 void
 233 ExportGraphBuilder::Encoder::add_child (FileSpec const & new_config)
 234 {
 235         filenames.push_back (new_config.filename);
 236 }
 237
 238 void
 239 ExportGraphBuilder::Encoder::destroy_writer (bool delete_out_file)
 240 {
 241         if (delete_out_file ) {
 242
 243                 if (float_writer) {
 244                         float_writer->close ();
 245                 }
 246
 247                 if (int_writer) {
 248                         int_writer->close ();
 249                 }
 250
 251                 if (short_writer) {
 252                         short_writer->close ();
 253                 }
 254
 255                 if (std::remove(writer_filename.c_str() ) != 0) {
 256                         std::cout << "Encoder::destroy_writer () : Error removing file: " << strerror(errno) << std::endl;
 257                 }
 258         }
 259
 260         float_writer.reset ();
 261         int_writer.reset ();
 262         short_writer.reset ();
 263 }
 264
 265 bool
 266 ExportGraphBuilder::Encoder::operator== (FileSpec const & other_config) const
 267 {
 268         return get_real_format (config) == get_real_format (other_config);
 269 }
 270
 271 int
 272 ExportGraphBuilder::Encoder::get_real_format (FileSpec const & config)
 273 {
 274         ExportFormatSpecification & format = *config.format;
 275         return format.format_id() | format.sample_format() | format.endianness();
 276 }
 277
 278 template<typename T>
 279 void
 280 ExportGraphBuilder::Encoder::init_writer (boost::shared_ptr<AudioGrapher::SndfileWriter<T> > & writer)
 281 {
 282         unsigned channels = config.channel_config->get_n_chans();
 283         int format = get_real_format (config);
 284         config.filename->set_channel_config(config.channel_config);
 285         writer_filename = config.filename->get_path (config.format);
 286
 287         writer.reset (new AudioGrapher::SndfileWriter<T> (writer_filename, format, channels, config.format->sample_rate(), config.broadcast_info));
 288         writer->FileWritten.connect_same_thread (copy_files_connection, boost::bind (&ExportGraphBuilder::Encoder::copy_files, this, _1));
 289 }
 290
 291 void
 292 ExportGraphBuilder::Encoder::copy_files (std::string orig_path)
 293 {
 294         while (filenames.size()) {
 295                 ExportFilenamePtr & filename = filenames.front();
 296                 PBD::copy_file (orig_path, filename->get_path (config.format).c_str());
 297                 filenames.pop_front();
 298         }
 299 }
 300
 301 /* SFC */
 302
 303 ExportGraphBuilder::SFC::SFC (ExportGraphBuilder &parent, FileSpec const & new_config, framecnt_t max_frames)
 304         : data_width(0)
 305 {
 306         config = new_config;
 307         data_width = sndfile_data_width (Encoder::get_real_format (config));
 308         unsigned channels = new_config.channel_config->get_n_chans();
 309         _analyse = config.format->analyse();
 310         if (_analyse) {
 311                 framecnt_t sample_rate = parent.session.nominal_frame_rate();
 312                 framecnt_t sb = config.format->silence_beginning_at (parent.timespan->get_start(), sample_rate);
 313                 framecnt_t se = config.format->silence_end_at (parent.timespan->get_end(), sample_rate);
 314                 framecnt_t duration = parent.timespan->get_length () + sb + se;
 315                 max_frames = min ((framecnt_t) 8192 * channels, max ((framecnt_t) 4096 * channels, max_frames));
 316                 chunker.reset (new Chunker<Sample> (max_frames));
 317                 analyser.reset (new Analyser (config.format->sample_rate(), channels, max_frames,
 318                                         (framecnt_t) ceil (duration * config.format->sample_rate () / (double) sample_rate)));
 319                 chunker->add_output (analyser);
 320                 parent.add_analyser (config.filename->get_path (config.format), analyser);
 321         }
 322
 323         if (data_width == 8 || data_width == 16) {
 324                 short_converter = ShortConverterPtr (new SampleFormatConverter<short> (channels));
 325                 short_converter->init (max_frames, config.format->dither_type(), data_width);
 326                 add_child (config);
 327                 if (_analyse) { analyser->add_output (short_converter); }
 328
 329         } else if (data_width == 24 || data_width == 32) {
 330                 int_converter = IntConverterPtr (new SampleFormatConverter<int> (channels));
 331                 int_converter->init (max_frames, config.format->dither_type(), data_width);
 332                 add_child (config);
 333                 if (_analyse) { analyser->add_output (int_converter); }
 334         } else {
 335                 int actual_data_width = 8 * sizeof(Sample);
 336                 float_converter = FloatConverterPtr (new SampleFormatConverter<Sample> (channels));
 337                 float_converter->init (max_frames, config.format->dither_type(), actual_data_width);
 338                 add_child (config);
 339                 if (_analyse) { analyser->add_output (float_converter); }
 340         }
 341 }
 342
 343 void
 344 ExportGraphBuilder::SFC::set_peak (float gain)
 345 {
 346         if (_analyse) {
 347                 analyser->set_normalization_gain (gain);
 348         }
 349 }
 350
 351 ExportGraphBuilder::FloatSinkPtr
 352 ExportGraphBuilder::SFC::sink ()
 353 {
 354         if (_analyse) {
 355                 return chunker;
 356         } else if (data_width == 8 || data_width == 16) {
 357                 return short_converter;
 358         } else if (data_width == 24 || data_width == 32) {
 359                 return int_converter;
 360         } else {
 361                 return float_converter;
 362         }
 363 }
 364
 365 void
 366 ExportGraphBuilder::SFC::add_child (FileSpec const & new_config)
 367 {
 368         for (boost::ptr_list<Encoder>::iterator it = children.begin(); it != children.end(); ++it) {
 369                 if (*it == new_config) {
 370                         it->add_child (new_config);
 371                         return;
 372                 }
 373         }
 374
 375         children.push_back (new Encoder());
 376         Encoder & encoder = children.back();
 377
 378         if (data_width == 8 || data_width == 16) {
 379                 short_converter->add_output (encoder.init<short> (new_config));
 380         } else if (data_width == 24 || data_width == 32) {
 381                 int_converter->add_output (encoder.init<int> (new_config));
 382         } else {
 383                 float_converter->add_output (encoder.init<Sample> (new_config));
 384         }
 385 }
 386
 387 void
 388 ExportGraphBuilder::SFC::remove_children (bool remove_out_files)
 389 {
 390         boost::ptr_list<Encoder>::iterator iter = children.begin ();
 391
 392         while (iter != children.end() ) {
 393
 394                 if (remove_out_files) {
 395                         iter->destroy_writer(remove_out_files);
 396                 }
 397                 iter = children.erase (iter);
 398         }
 399 }
 400
 401 bool
 402 ExportGraphBuilder::SFC::operator== (FileSpec const & other_config) const
 403 {
 404         return config.format->sample_format() == other_config.format->sample_format();
 405 }
 406
 407 /* Normalizer */
 408
 409 ExportGraphBuilder::Normalizer::Normalizer (ExportGraphBuilder & parent, FileSpec const & new_config, framecnt_t max_frames)
 410         : parent (parent)
 411         , use_loudness (false)
 412 {
 413         std::string tmpfile_path = parent.session.session_directory().export_path();
 414         tmpfile_path = Glib::build_filename(tmpfile_path, "XXXXXX");
 415         std::vector<char> tmpfile_path_buf(tmpfile_path.size() + 1);
 416         std::copy(tmpfile_path.begin(), tmpfile_path.end(), tmpfile_path_buf.begin());
 417         tmpfile_path_buf[tmpfile_path.size()] = '\0';
 418
 419         config = new_config;
 420         uint32_t const channels = config.channel_config->get_n_chans();
 421         max_frames_out = 4086 - (4086 % channels); // TODO good chunk size
 422         use_loudness = config.format->normalize_loudness ();
 423
 424         buffer.reset (new AllocatingProcessContext<Sample> (max_frames_out, channels));
 425         peak_reader.reset (new PeakReader ());
 426         loudness_reader.reset (new LoudnessReader (config.format->sample_rate(), channels, max_frames));
 427         normalizer.reset (new AudioGrapher::Normalizer (use_loudness ? 0.0 : config.format->normalize_dbfs()));
 428         threader.reset (new Threader<Sample> (parent.thread_pool));
 429
 430         normalizer->alloc_buffer (max_frames_out);
 431         normalizer->add_output (threader);
 432
 433         int format = ExportFormatBase::F_RAW | ExportFormatBase::SF_Float;
 434         tmp_file.reset (new TmpFile<float> (&tmpfile_path_buf[0], format, channels, config.format->sample_rate()));
 435         tmp_file->FileWritten.connect_same_thread (post_processing_connection,
 436                                                    boost::bind (&Normalizer::start_post_processing, this));
 437
 438         add_child (new_config);
 439
 440         if (use_loudness) {
 441                 loudness_reader->add_output (tmp_file);
 442         } else {
 443                 peak_reader->add_output (tmp_file);
 444         }
 445 }
 446
 447 ExportGraphBuilder::FloatSinkPtr
 448 ExportGraphBuilder::Normalizer::sink ()
 449 {
 450         if (use_loudness) {
 451                 return loudness_reader;
 452         }
 453         return peak_reader;
 454 }
 455
 456 void
 457 ExportGraphBuilder::Normalizer::add_child (FileSpec const & new_config)
 458 {
 459         for (boost::ptr_list<SFC>::iterator it = children.begin(); it != children.end(); ++it) {
 460                 if (*it == new_config) {
 461                         it->add_child (new_config);
 462                         return;
 463                 }
 464         }
 465
 466         children.push_back (new SFC (parent, new_config, max_frames_out));
 467         threader->add_output (children.back().sink());
 468 }
 469
 470 void
 471 ExportGraphBuilder::Normalizer::remove_children (bool remove_out_files)
 472 {
 473         boost::ptr_list<SFC>::iterator iter = children.begin ();
 474
 475         while (iter != children.end() ) {
 476                 iter->remove_children (remove_out_files);
 477                 iter = children.erase (iter);
 478         }
 479 }
 480
 481 bool
 482 ExportGraphBuilder::Normalizer::operator== (FileSpec const & other_config) const
 483 {
 484         return config.format->normalize() == other_config.format->normalize() &&
 485                 (
 486                  (!config.format->normalize_loudness () && config.format->normalize_dbfs() == other_config.format->normalize_dbfs())
 487                  ||
 488                  (config.format->normalize_loudness () /* lufs/dbtp is a result option, not an instantaion option */)
 489                 );
 490 }
 491
 492 unsigned
 493 ExportGraphBuilder::Normalizer::get_normalize_cycle_count() const
 494 {
 495         return static_cast<unsigned>(std::ceil(static_cast<float>(tmp_file->get_frames_written()) /
 496                                                max_frames_out));
 497 }
 498
 499 bool
 500 ExportGraphBuilder::Normalizer::process()
 501 {
 502         framecnt_t frames_read = tmp_file->read (*buffer);
 503         return frames_read != buffer->frames();
 504 }
 505
 506 void
 507 ExportGraphBuilder::Normalizer::start_post_processing()
 508 {
 509         float gain;
 510         if (use_loudness) {
 511                 gain = normalizer->set_peak (loudness_reader->get_peak (config.format->normalize_lufs (), config.format->normalize_dbtp ()));
 512         } else {
 513                 gain = normalizer->set_peak (peak_reader->get_peak());
 514         }
 515         for (boost::ptr_list<SFC>::iterator i = children.begin(); i != children.end(); ++i) {
 516                 (*i).set_peak (gain);
 517         }
 518         tmp_file->seek (0, SEEK_SET);
 519         tmp_file->add_output (normalizer);
 520         parent.normalizers.push_back (this);
 521 }
 522
 523 /* SRC */
 524
 525 ExportGraphBuilder::SRC::SRC (ExportGraphBuilder & parent, FileSpec const & new_config, framecnt_t max_frames)
 526         : parent (parent)
 527 {
 528         config = new_config;
 529         converter.reset (new SampleRateConverter (new_config.channel_config->get_n_chans()));
 530         ExportFormatSpecification & format = *new_config.format;
 531         converter->init (parent.session.nominal_frame_rate(), format.sample_rate(), format.src_quality());
 532         max_frames_out = converter->allocate_buffers (max_frames);
 533
 534         add_child (new_config);
 535 }
 536
 537 ExportGraphBuilder::FloatSinkPtr
 538 ExportGraphBuilder::SRC::sink ()
 539 {
 540         return converter;
 541 }
 542
 543 void
 544 ExportGraphBuilder::SRC::add_child (FileSpec const & new_config)
 545 {
 546         if (new_config.format->normalize()) {
 547                 add_child_to_list (new_config, normalized_children);
 548         } else {
 549                 add_child_to_list (new_config, children);
 550         }
 551 }
 552
 553 void
 554 ExportGraphBuilder::SRC::remove_children (bool remove_out_files)
 555 {
 556         boost::ptr_list<SFC>::iterator sfc_iter = children.begin();
 557
 558         while (sfc_iter != children.end() ) {
 559                 converter->remove_output (sfc_iter->sink() );
 560                 sfc_iter->remove_children (remove_out_files);
 561                 sfc_iter = children.erase (sfc_iter);
 562         }
 563
 564         boost::ptr_list<Normalizer>::iterator norm_iter = normalized_children.begin();
 565
 566         while (norm_iter != normalized_children.end() ) {
 567                 converter->remove_output (norm_iter->sink() );
 568                 norm_iter->remove_children (remove_out_files);
 569                 norm_iter = normalized_children.erase (norm_iter);
 570         }
 571
 572 }
 573
 574 template<typename T>
 575 void
 576 ExportGraphBuilder::SRC::add_child_to_list (FileSpec const & new_config, boost::ptr_list<T> & list)
 577 {
 578         for (typename boost::ptr_list<T>::iterator it = list.begin(); it != list.end(); ++it) {
 579                 if (*it == new_config) {
 580                         it->add_child (new_config);
 581                         return;
 582                 }
 583         }
 584
 585         list.push_back (new T (parent, new_config, max_frames_out));
 586         converter->add_output (list.back().sink ());
 587 }
 588
 589 bool
 590 ExportGraphBuilder::SRC::operator== (FileSpec const & other_config) const
 591 {
 592         return config.format->sample_rate() == other_config.format->sample_rate();
 593 }
 594
 595 /* SilenceHandler */
 596 ExportGraphBuilder::SilenceHandler::SilenceHandler (ExportGraphBuilder & parent, FileSpec const & new_config, framecnt_t max_frames)
 597         : parent (parent)
 598 {
 599         config = new_config;
 600         max_frames_in = max_frames;
 601         framecnt_t sample_rate = parent.session.nominal_frame_rate();
 602
 603 #ifdef MIXBUS
 604         silence_trimmer.reset (new SilenceTrimmer<Sample>(max_frames_in, -90));
 605 #else
 606         // TODO silence-threshold should be per export-preset, with Config->get_silence_threshold being the default
 607         silence_trimmer.reset (new SilenceTrimmer<Sample>(max_frames_in, Config->get_export_silence_threshold ()));
 608 #endif
 609         silence_trimmer->set_trim_beginning (config.format->trim_beginning());
 610         silence_trimmer->set_trim_end (config.format->trim_end());
 611
 612         framecnt_t sb = config.format->silence_beginning_at (parent.timespan->get_start(), sample_rate);
 613         framecnt_t se = config.format->silence_end_at (parent.timespan->get_end(), sample_rate);
 614
 615         silence_trimmer->add_silence_to_beginning (sb);
 616         silence_trimmer->add_silence_to_end (se);
 617
 618         add_child (new_config);
 619 }
 620
 621 ExportGraphBuilder::FloatSinkPtr
 622 ExportGraphBuilder::SilenceHandler::sink ()
 623 {
 624         return silence_trimmer;
 625 }
 626
 627 void
 628 ExportGraphBuilder::SilenceHandler::add_child (FileSpec const & new_config)
 629 {
 630         for (boost::ptr_list<SRC>::iterator it = children.begin(); it != children.end(); ++it) {
 631                 if (*it == new_config) {
 632                         it->add_child (new_config);
 633                         return;
 634                 }
 635         }
 636
 637         children.push_back (new SRC (parent, new_config, max_frames_in));
 638         silence_trimmer->add_output (children.back().sink());
 639 }
 640
 641 void
 642 ExportGraphBuilder::SilenceHandler::remove_children (bool remove_out_files)
 643 {
 644         boost::ptr_list<SRC>::iterator iter = children.begin();
 645
 646         while (iter != children.end() ) {
 647                 silence_trimmer->remove_output (iter->sink() );
 648                 iter->remove_children (remove_out_files);
 649                 iter = children.erase (iter);
 650         }
 651 }
 652
 653 bool
 654 ExportGraphBuilder::SilenceHandler::operator== (FileSpec const & other_config) const
 655 {
 656         ExportFormatSpecification & format = *config.format;
 657         ExportFormatSpecification & other_format = *other_config.format;
 658         return (format.trim_beginning() == other_format.trim_beginning()) &&
 659                 (format.trim_end() == other_format.trim_end()) &&
 660                 (format.silence_beginning_time() == other_format.silence_beginning_time()) &&
 661                 (format.silence_end_time() == other_format.silence_end_time());
 662 }
 663
 664 /* ChannelConfig */
 665
 666 ExportGraphBuilder::ChannelConfig::ChannelConfig (ExportGraphBuilder & parent, FileSpec const & new_config, ChannelMap & channel_map)
 667         : parent (parent)
 668 {
 669         typedef ExportChannelConfiguration::ChannelList ChannelList;
 670
 671         config = new_config;
 672
 673         framecnt_t max_frames = parent.session.engine().samples_per_cycle();
 674         interleaver.reset (new Interleaver<Sample> ());
 675         interleaver->init (new_config.channel_config->get_n_chans(), max_frames);
 676
 677         // Make the chunk size divisible by the channel count
 678         int chan_count = new_config.channel_config->get_n_chans();
 679         max_frames_out = 8192;
 680         if (chan_count > 0) {
 681                 max_frames_out -= max_frames_out % chan_count;
 682         }
 683         chunker.reset (new Chunker<Sample> (max_frames_out));
 684         interleaver->add_output(chunker);
 685
 686         ChannelList const & channel_list = config.channel_config->get_channels();
 687         unsigned chan = 0;
 688         for (ChannelList::const_iterator it = channel_list.begin(); it != channel_list.end(); ++it, ++chan) {
 689                 ChannelMap::iterator map_it = channel_map.find (*it);
 690                 if (map_it == channel_map.end()) {
 691                         std::pair<ChannelMap::iterator, bool> result_pair =
 692                                 channel_map.insert (std::make_pair (*it, IdentityVertexPtr (new IdentityVertex<Sample> ())));
 693                         assert (result_pair.second);
 694                         map_it = result_pair.first;
 695                 }
 696                 map_it->second->add_output (interleaver->input (chan));
 697         }
 698
 699         add_child (new_config);
 700 }
 701
 702 void
 703 ExportGraphBuilder::ChannelConfig::add_child (FileSpec const & new_config)
 704 {
 705         assert (*this == new_config);
 706
 707         for (boost::ptr_list<SilenceHandler>::iterator it = children.begin(); it != children.end(); ++it) {
 708                 if (*it == new_config) {
 709                         it->add_child (new_config);
 710                         return;
 711                 }
 712         }
 713
 714         children.push_back (new SilenceHandler (parent, new_config, max_frames_out));
 715         chunker->add_output (children.back().sink ());
 716 }
 717
 718 void
 719 ExportGraphBuilder::ChannelConfig::remove_children (bool remove_out_files)
 720 {
 721         boost::ptr_list<SilenceHandler>::iterator iter = children.begin();
 722
 723         while(iter != children.end() ) {
 724
 725                 chunker->remove_output (iter->sink ());
 726                 iter->remove_children (remove_out_files);
 727                 iter = children.erase(iter);
 728         }
 729 }
 730
 731 bool
 732 ExportGraphBuilder::ChannelConfig::operator== (FileSpec const & other_config) const
 733 {
 734         return config.channel_config == other_config.channel_config;
 735 }
 736
 737 } // namespace ARDOUR