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