fix crash when copy'ing latent plugins
[ardour.git] / libs / ardour / export_graph_builder.cc
index 86d374a1da425eb8a9a31b3d30463a0cf9380b4a..7c5a434beecd3a8975a550acd6be9829bdbd7d35 100644 (file)
@@ -1,14 +1,43 @@
+/*
+  Copyright (C) 2008-2012 Paul Davis
+  Author: Sakari Bergen
+
+  This program is free software; you can redistribute it and/or modify
+  it under the terms of the GNU General Public License as published by
+  the Free Software Foundation; either version 2 of the License, or
+  (at your option) any later version.
+
+  This program is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+  GNU General Public License for more details.
+
+  You should have received a copy of the GNU General Public License
+  along with this program; if not, write to the Free Software
+  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+
+*/
+
 #include "ardour/export_graph_builder.h"
 
+#include <vector>
+
+#include <glibmm/miscutils.h>
+
 #include "audiographer/process_context.h"
+#include "audiographer/general/chunker.h"
 #include "audiographer/general/interleaver.h"
 #include "audiographer/general/normalizer.h"
+#include "audiographer/general/analyser.h"
 #include "audiographer/general/peak_reader.h"
+#include "audiographer/general/loudness_reader.h"
 #include "audiographer/general/sample_format_converter.h"
 #include "audiographer/general/sr_converter.h"
 #include "audiographer/general/silence_trimmer.h"
 #include "audiographer/general/threader.h"
 #include "audiographer/sndfile/tmp_file.h"
+#include "audiographer/sndfile/tmp_file_rt.h"
+#include "audiographer/sndfile/tmp_file_sync.h"
 #include "audiographer/sndfile/sndfile_writer.h"
 
 #include "ardour/audioengine.h"
 #include "ardour/export_filename.h"
 #include "ardour/export_format_specification.h"
 #include "ardour/export_timespan.h"
+#include "ardour/session_directory.h"
 #include "ardour/sndfile_helpers.h"
-#include "ardour/utils.h"
 
-#include "pbd/filesystem.h"
+#include "pbd/file_utils.h"
 #include "pbd/cpus.h"
 
 using namespace AudioGrapher;
@@ -28,10 +57,10 @@ using std::string;
 namespace ARDOUR {
 
 ExportGraphBuilder::ExportGraphBuilder (Session const & session)
-  : session (session)
-  , thread_pool (hardware_concurrency())
+       : session (session)
+       , thread_pool (hardware_concurrency())
 {
-       process_buffer_frames = session.engine().frames_per_cycle();
+       process_buffer_frames = session.engine().samples_per_cycle();
 }
 
 ExportGraphBuilder::~ExportGraphBuilder ()
@@ -55,17 +84,27 @@ ExportGraphBuilder::process (framecnt_t frames, bool last_cycle)
 }
 
 bool
-ExportGraphBuilder::process_normalize ()
+ExportGraphBuilder::post_process ()
 {
-       for (std::list<Normalizer *>::iterator it = normalizers.begin(); it != normalizers.end(); /* ++ in loop */) {
+       for (std::list<Intermediate *>::iterator it = intermediates.begin(); it != intermediates.end(); /* ++ in loop */) {
                if ((*it)->process()) {
-                       it = normalizers.erase (it);
+                       it = intermediates.erase (it);
                } else {
                        ++it;
                }
        }
 
-       return normalizers.empty();
+       return intermediates.empty();
+}
+
+unsigned
+ExportGraphBuilder::get_postprocessing_cycle_count() const
+{
+       unsigned max = 0;
+       for (std::list<Intermediate *>::const_iterator it = intermediates.begin(); it != intermediates.end(); ++it) {
+               max = std::max(max, (*it)->get_postprocessing_cycle_count());
+       }
+       return max;
 }
 
 void
@@ -74,7 +113,20 @@ ExportGraphBuilder::reset ()
        timespan.reset();
        channel_configs.clear ();
        channels.clear ();
-       normalizers.clear ();
+       intermediates.clear ();
+       analysis_map.clear();
+       _realtime = false;
+}
+
+void
+ExportGraphBuilder::cleanup (bool remove_out_files/*=false*/)
+{
+       ChannelConfigList::iterator iter = channel_configs.begin();
+
+       while (iter != channel_configs.end() ) {
+               iter->remove_children(remove_out_files);
+               iter = channel_configs.erase(iter);
+       }
 }
 
 void
@@ -84,7 +136,7 @@ ExportGraphBuilder::set_current_timespan (boost::shared_ptr<ExportTimespan> span
 }
 
 void
-ExportGraphBuilder::add_config (FileSpec const & config)
+ExportGraphBuilder::add_config (FileSpec const & config, bool rt)
 {
        ExportChannelConfiguration::ChannelList const & channels =
                config.channel_config->get_channels();
@@ -93,10 +145,12 @@ ExportGraphBuilder::add_config (FileSpec const & config)
                (*it)->set_max_buffer_size(process_buffer_frames);
        }
 
+       _realtime = rt;
+
        // If the sample rate is "session rate", change it to the real value.
        // However, we need to copy it to not change the config which is saved...
        FileSpec new_config (config);
-       new_config.format.reset(new ExportFormatSpecification(*new_config.format));
+       new_config.format.reset(new ExportFormatSpecification(*new_config.format, false));
        if(new_config.format->sample_rate() == ExportFormatBase::SR_Session) {
                framecnt_t session_rate = session.nominal_frame_rate();
                new_config.format->set_sample_rate(ExportFormatBase::nearest_sample_rate(session_rate));
@@ -127,6 +181,16 @@ ExportGraphBuilder::add_config (FileSpec const & config)
        }
 }
 
+void
+ExportGraphBuilder::get_analysis_results (AnalysisResults& results) {
+       for (AnalysisMap::iterator i = analysis_map.begin(); i != analysis_map.end(); ++i) {
+               ExportAnalysisPtr p = i->second->result ();
+               if (p) {
+                       results.insert (std::make_pair (i->first, p));
+               }
+       }
+}
+
 void
 ExportGraphBuilder::add_split_config (FileSpec const & config)
 {
@@ -176,6 +240,33 @@ ExportGraphBuilder::Encoder::add_child (FileSpec const & new_config)
        filenames.push_back (new_config.filename);
 }
 
+void
+ExportGraphBuilder::Encoder::destroy_writer (bool delete_out_file)
+{
+       if (delete_out_file ) {
+
+               if (float_writer) {
+                       float_writer->close ();
+               }
+
+               if (int_writer) {
+                       int_writer->close ();
+               }
+
+               if (short_writer) {
+                       short_writer->close ();
+               }
+
+               if (std::remove(writer_filename.c_str() ) != 0) {
+                       std::cout << "Encoder::destroy_writer () : Error removing file: " << strerror(errno) << std::endl;
+               }
+       }
+
+       float_writer.reset ();
+       int_writer.reset ();
+       short_writer.reset ();
+}
+
 bool
 ExportGraphBuilder::Encoder::operator== (FileSpec const & other_config) const
 {
@@ -196,9 +287,9 @@ ExportGraphBuilder::Encoder::init_writer (boost::shared_ptr<AudioGrapher::Sndfil
        unsigned channels = config.channel_config->get_n_chans();
        int format = get_real_format (config);
        config.filename->set_channel_config(config.channel_config);
-       string filename = config.filename->get_path (config.format);
+       writer_filename = config.filename->get_path (config.format);
 
-       writer.reset (new AudioGrapher::SndfileWriter<T> (filename, format, channels, config.format->sample_rate(), config.broadcast_info));
+       writer.reset (new AudioGrapher::SndfileWriter<T> (writer_filename, format, channels, config.format->sample_rate(), config.broadcast_info));
        writer->FileWritten.connect_same_thread (copy_files_connection, boost::bind (&ExportGraphBuilder::Encoder::copy_files, this, _1));
 }
 
@@ -206,41 +297,70 @@ void
 ExportGraphBuilder::Encoder::copy_files (std::string orig_path)
 {
        while (filenames.size()) {
-               FilenamePtr & filename = filenames.front();
-               PBD::sys::copy_file (orig_path, filename->get_path (config.format).c_str());
+               ExportFilenamePtr & filename = filenames.front();
+               PBD::copy_file (orig_path, filename->get_path (config.format).c_str());
                filenames.pop_front();
        }
 }
 
 /* SFC */
 
-ExportGraphBuilder::SFC::SFC (ExportGraphBuilder &, FileSpec const & new_config, framecnt_t max_frames)
-  : data_width(0)
+ExportGraphBuilder::SFC::SFC (ExportGraphBuilder &parent, FileSpec const & new_config, framecnt_t max_frames)
+       : data_width(0)
 {
        config = new_config;
        data_width = sndfile_data_width (Encoder::get_real_format (config));
        unsigned channels = new_config.channel_config->get_n_chans();
+       _analyse = config.format->analyse();
+       if (_analyse) {
+               framecnt_t sample_rate = parent.session.nominal_frame_rate();
+               framecnt_t sb = config.format->silence_beginning_at (parent.timespan->get_start(), sample_rate);
+               framecnt_t se = config.format->silence_end_at (parent.timespan->get_end(), sample_rate);
+               framecnt_t duration = parent.timespan->get_length () + sb + se;
+               max_frames = min ((framecnt_t) 8192 * channels, max ((framecnt_t) 4096 * channels, max_frames));
+               chunker.reset (new Chunker<Sample> (max_frames));
+               analyser.reset (new Analyser (config.format->sample_rate(), channels, max_frames,
+                                       (framecnt_t) ceil (duration * config.format->sample_rate () / (double) sample_rate)));
+               chunker->add_output (analyser);
+
+               config.filename->set_channel_config (config.channel_config);
+               parent.add_analyser (config.filename->get_path (config.format), analyser);
+       }
 
        if (data_width == 8 || data_width == 16) {
                short_converter = ShortConverterPtr (new SampleFormatConverter<short> (channels));
                short_converter->init (max_frames, config.format->dither_type(), data_width);
                add_child (config);
+               if (_analyse) { analyser->add_output (short_converter); }
+
        } else if (data_width == 24 || data_width == 32) {
                int_converter = IntConverterPtr (new SampleFormatConverter<int> (channels));
                int_converter->init (max_frames, config.format->dither_type(), data_width);
                add_child (config);
+               if (_analyse) { analyser->add_output (int_converter); }
        } else {
                int actual_data_width = 8 * sizeof(Sample);
                float_converter = FloatConverterPtr (new SampleFormatConverter<Sample> (channels));
                float_converter->init (max_frames, config.format->dither_type(), actual_data_width);
                add_child (config);
+               if (_analyse) { analyser->add_output (float_converter); }
+       }
+}
+
+void
+ExportGraphBuilder::SFC::set_peak (float gain)
+{
+       if (_analyse) {
+               analyser->set_normalization_gain (gain);
        }
 }
 
 ExportGraphBuilder::FloatSinkPtr
 ExportGraphBuilder::SFC::sink ()
 {
-       if (data_width == 8 || data_width == 16) {
+       if (_analyse) {
+               return chunker;
+       } else if (data_width == 8 || data_width == 16) {
                return short_converter;
        } else if (data_width == 24 || data_width == 32) {
                return int_converter;
@@ -271,46 +391,94 @@ ExportGraphBuilder::SFC::add_child (FileSpec const & new_config)
        }
 }
 
+void
+ExportGraphBuilder::SFC::remove_children (bool remove_out_files)
+{
+       boost::ptr_list<Encoder>::iterator iter = children.begin ();
+
+       while (iter != children.end() ) {
+
+               if (remove_out_files) {
+                       iter->destroy_writer(remove_out_files);
+               }
+               iter = children.erase (iter);
+       }
+}
+
 bool
 ExportGraphBuilder::SFC::operator== (FileSpec const & other_config) const
 {
        return config.format->sample_format() == other_config.format->sample_format();
 }
 
-/* Normalizer */
+/* Intermediate (Normalizer, TmpFile) */
 
-ExportGraphBuilder::Normalizer::Normalizer (ExportGraphBuilder & parent, FileSpec const & new_config, framecnt_t /*max_frames*/)
-  : parent (parent)
+ExportGraphBuilder::Intermediate::Intermediate (ExportGraphBuilder & parent, FileSpec const & new_config, framecnt_t max_frames)
+       : parent (parent)
+       , use_loudness (false)
+       , use_peak (false)
 {
+       std::string tmpfile_path = parent.session.session_directory().export_path();
+       tmpfile_path = Glib::build_filename(tmpfile_path, "XXXXXX");
+       std::vector<char> tmpfile_path_buf(tmpfile_path.size() + 1);
+       std::copy(tmpfile_path.begin(), tmpfile_path.end(), tmpfile_path_buf.begin());
+       tmpfile_path_buf[tmpfile_path.size()] = '\0';
+
        config = new_config;
-       max_frames_out = 4086; // TODO good chunk size
+       uint32_t const channels = config.channel_config->get_n_chans();
+       max_frames_out = 4086 - (4086 % channels); // TODO good chunk size
+       use_loudness = config.format->normalize_loudness ();
+       use_peak = config.format->normalize ();
 
-       buffer.reset (new AllocatingProcessContext<Sample> (max_frames_out, config.channel_config->get_n_chans()));
-       peak_reader.reset (new PeakReader ());
-       normalizer.reset (new AudioGrapher::Normalizer (config.format->normalize_target()));
-       threader.reset (new Threader<Sample> (parent.thread_pool));
+       buffer.reset (new AllocatingProcessContext<Sample> (max_frames_out, channels));
 
+       if (use_peak) {
+               peak_reader.reset (new PeakReader ());
+       }
+       if (use_loudness) {
+               loudness_reader.reset (new LoudnessReader (config.format->sample_rate(), channels, max_frames));
+       }
+
+       normalizer.reset (new AudioGrapher::Normalizer (use_loudness ? 0.0 : config.format->normalize_dbfs()));
+       threader.reset (new Threader<Sample> (parent.thread_pool));
        normalizer->alloc_buffer (max_frames_out);
        normalizer->add_output (threader);
 
        int format = ExportFormatBase::F_RAW | ExportFormatBase::SF_Float;
-       tmp_file.reset (new TmpFile<float> (format, config.channel_config->get_n_chans(),
-                                           config.format->sample_rate()));
-       tmp_file->FileWritten.connect_same_thread (post_processing_connection, boost::bind (&Normalizer::start_post_processing, this));
+
+       if (parent._realtime) {
+               tmp_file.reset (new TmpFileRt<float> (&tmpfile_path_buf[0], format, channels, config.format->sample_rate()));
+       } else {
+               tmp_file.reset (new TmpFileSync<float> (&tmpfile_path_buf[0], format, channels, config.format->sample_rate()));
+       }
+
+       tmp_file->FileWritten.connect_same_thread (post_processing_connection,
+                                                  boost::bind (&Intermediate::prepare_post_processing, this));
+       tmp_file->FileFlushed.connect_same_thread (post_processing_connection,
+                                                  boost::bind (&Intermediate::start_post_processing, this));
 
        add_child (new_config);
 
-       peak_reader->add_output (tmp_file);
+       if (use_loudness) {
+               loudness_reader->add_output (tmp_file);
+       } else if (use_peak) {
+               peak_reader->add_output (tmp_file);
+       }
 }
 
 ExportGraphBuilder::FloatSinkPtr
-ExportGraphBuilder::Normalizer::sink ()
+ExportGraphBuilder::Intermediate::sink ()
 {
-       return peak_reader;
+       if (use_loudness) {
+               return loudness_reader;
+       } else if (use_peak) {
+               return peak_reader;
+       }
+       return tmp_file;
 }
 
 void
-ExportGraphBuilder::Normalizer::add_child (FileSpec const & new_config)
+ExportGraphBuilder::Intermediate::add_child (FileSpec const & new_config)
 {
        for (boost::ptr_list<SFC>::iterator it = children.begin(); it != children.end(); ++it) {
                if (*it == new_config) {
@@ -323,33 +491,80 @@ ExportGraphBuilder::Normalizer::add_child (FileSpec const & new_config)
        threader->add_output (children.back().sink());
 }
 
+void
+ExportGraphBuilder::Intermediate::remove_children (bool remove_out_files)
+{
+       boost::ptr_list<SFC>::iterator iter = children.begin ();
+
+       while (iter != children.end() ) {
+               iter->remove_children (remove_out_files);
+               iter = children.erase (iter);
+       }
+}
+
 bool
-ExportGraphBuilder::Normalizer::operator== (FileSpec const & other_config) const
+ExportGraphBuilder::Intermediate::operator== (FileSpec const & other_config) const
 {
        return config.format->normalize() == other_config.format->normalize() &&
-              config.format->normalize_target() == other_config.format->normalize_target();
+               config.format->normalize_loudness () == other_config.format->normalize_loudness() &&
+               (
+                (!config.format->normalize_loudness () && config.format->normalize_dbfs() == other_config.format->normalize_dbfs())
+                ||
+                // FIXME: allow simultaneous export of two formats with different loundness normalization settings
+                (config.format->normalize_loudness () /* lufs/dbtp is a result option, not an instantaion option */)
+               );
+}
+
+unsigned
+ExportGraphBuilder::Intermediate::get_postprocessing_cycle_count() const
+{
+       return static_cast<unsigned>(std::ceil(static_cast<float>(tmp_file->get_frames_written()) /
+                                              max_frames_out));
 }
 
 bool
-ExportGraphBuilder::Normalizer::process()
+ExportGraphBuilder::Intermediate::process()
 {
        framecnt_t frames_read = tmp_file->read (*buffer);
        return frames_read != buffer->frames();
 }
 
 void
-ExportGraphBuilder::Normalizer::start_post_processing()
+ExportGraphBuilder::Intermediate::prepare_post_processing()
+{
+       // called in sync rt-context
+       float gain;
+       if (use_loudness) {
+               gain = normalizer->set_peak (loudness_reader->get_peak (config.format->normalize_lufs (), config.format->normalize_dbtp ()));
+       } else if (use_peak) {
+               gain = normalizer->set_peak (peak_reader->get_peak());
+       } else {
+               gain = normalizer->set_peak (0.0);
+       }
+       if (use_loudness || use_peak) {
+               // push info to analyzers
+               for (boost::ptr_list<SFC>::iterator i = children.begin(); i != children.end(); ++i) {
+                       (*i).set_peak (gain);
+               }
+       }
+       tmp_file->add_output (normalizer);
+       parent.intermediates.push_back (this);
+}
+
+void
+ExportGraphBuilder::Intermediate::start_post_processing()
 {
-       normalizer->set_peak (peak_reader->get_peak());
+       // called in disk-thread (when exporting in realtime)
        tmp_file->seek (0, SEEK_SET);
-       tmp_file->add_output (normalizer);
-       parent.normalizers.push_back (this);
+       if (!AudioEngine::instance()->freewheeling ()) {
+               AudioEngine::instance()->freewheel (true);
+       }
 }
 
 /* SRC */
 
 ExportGraphBuilder::SRC::SRC (ExportGraphBuilder & parent, FileSpec const & new_config, framecnt_t max_frames)
-  : parent (parent)
+       : parent (parent)
 {
        config = new_config;
        converter.reset (new SampleRateConverter (new_config.channel_config->get_n_chans()));
@@ -369,13 +584,34 @@ ExportGraphBuilder::SRC::sink ()
 void
 ExportGraphBuilder::SRC::add_child (FileSpec const & new_config)
 {
-       if (new_config.format->normalize()) {
-               add_child_to_list (new_config, normalized_children);
+       if (new_config.format->normalize() || parent._realtime) {
+               add_child_to_list (new_config, intermediate_children);
        } else {
                add_child_to_list (new_config, children);
        }
 }
 
+void
+ExportGraphBuilder::SRC::remove_children (bool remove_out_files)
+{
+       boost::ptr_list<SFC>::iterator sfc_iter = children.begin();
+
+       while (sfc_iter != children.end() ) {
+               converter->remove_output (sfc_iter->sink() );
+               sfc_iter->remove_children (remove_out_files);
+               sfc_iter = children.erase (sfc_iter);
+       }
+
+       boost::ptr_list<Intermediate>::iterator norm_iter = intermediate_children.begin();
+
+       while (norm_iter != intermediate_children.end() ) {
+               converter->remove_output (norm_iter->sink() );
+               norm_iter->remove_children (remove_out_files);
+               norm_iter = intermediate_children.erase (norm_iter);
+       }
+
+}
+
 template<typename T>
 void
 ExportGraphBuilder::SRC::add_child_to_list (FileSpec const & new_config, boost::ptr_list<T> & list)
@@ -399,13 +635,18 @@ ExportGraphBuilder::SRC::operator== (FileSpec const & other_config) const
 
 /* SilenceHandler */
 ExportGraphBuilder::SilenceHandler::SilenceHandler (ExportGraphBuilder & parent, FileSpec const & new_config, framecnt_t max_frames)
-  : parent (parent)
+       : parent (parent)
 {
        config = new_config;
        max_frames_in = max_frames;
        framecnt_t sample_rate = parent.session.nominal_frame_rate();
 
-       silence_trimmer.reset (new SilenceTrimmer<Sample>(max_frames_in));
+#ifdef MIXBUS
+       silence_trimmer.reset (new SilenceTrimmer<Sample>(max_frames_in, -90));
+#else
+       // TODO silence-threshold should be per export-preset, with Config->get_silence_threshold being the default
+       silence_trimmer.reset (new SilenceTrimmer<Sample>(max_frames_in, Config->get_export_silence_threshold ()));
+#endif
        silence_trimmer->set_trim_beginning (config.format->trim_beginning());
        silence_trimmer->set_trim_end (config.format->trim_end());
 
@@ -438,30 +679,51 @@ ExportGraphBuilder::SilenceHandler::add_child (FileSpec const & new_config)
        silence_trimmer->add_output (children.back().sink());
 }
 
+void
+ExportGraphBuilder::SilenceHandler::remove_children (bool remove_out_files)
+{
+       boost::ptr_list<SRC>::iterator iter = children.begin();
+
+       while (iter != children.end() ) {
+               silence_trimmer->remove_output (iter->sink() );
+               iter->remove_children (remove_out_files);
+               iter = children.erase (iter);
+       }
+}
+
 bool
 ExportGraphBuilder::SilenceHandler::operator== (FileSpec const & other_config) const
 {
        ExportFormatSpecification & format = *config.format;
        ExportFormatSpecification & other_format = *other_config.format;
        return (format.trim_beginning() == other_format.trim_beginning()) &&
-              (format.trim_end() == other_format.trim_end()) &&
-              (format.silence_beginning_time() == other_format.silence_beginning_time()) &&
-              (format.silence_end_time() == other_format.silence_end_time());
+               (format.trim_end() == other_format.trim_end()) &&
+               (format.silence_beginning_time() == other_format.silence_beginning_time()) &&
+               (format.silence_end_time() == other_format.silence_end_time());
 }
 
 /* ChannelConfig */
 
 ExportGraphBuilder::ChannelConfig::ChannelConfig (ExportGraphBuilder & parent, FileSpec const & new_config, ChannelMap & channel_map)
-  : parent (parent)
+       : parent (parent)
 {
        typedef ExportChannelConfiguration::ChannelList ChannelList;
 
        config = new_config;
-       max_frames = parent.session.engine().frames_per_cycle();
 
+       framecnt_t max_frames = parent.session.engine().samples_per_cycle();
        interleaver.reset (new Interleaver<Sample> ());
        interleaver->init (new_config.channel_config->get_n_chans(), max_frames);
 
+       // Make the chunk size divisible by the channel count
+       int chan_count = new_config.channel_config->get_n_chans();
+       max_frames_out = 8192;
+       if (chan_count > 0) {
+               max_frames_out -= max_frames_out % chan_count;
+       }
+       chunker.reset (new Chunker<Sample> (max_frames_out));
+       interleaver->add_output(chunker);
+
        ChannelList const & channel_list = config.channel_config->get_channels();
        unsigned chan = 0;
        for (ChannelList::const_iterator it = channel_list.begin(); it != channel_list.end(); ++it, ++chan) {
@@ -481,6 +743,8 @@ ExportGraphBuilder::ChannelConfig::ChannelConfig (ExportGraphBuilder & parent, F
 void
 ExportGraphBuilder::ChannelConfig::add_child (FileSpec const & new_config)
 {
+       assert (*this == new_config);
+
        for (boost::ptr_list<SilenceHandler>::iterator it = children.begin(); it != children.end(); ++it) {
                if (*it == new_config) {
                        it->add_child (new_config);
@@ -488,9 +752,21 @@ ExportGraphBuilder::ChannelConfig::add_child (FileSpec const & new_config)
                }
        }
 
-       framecnt_t const max_frames_out = new_config.channel_config->get_n_chans() * max_frames;
        children.push_back (new SilenceHandler (parent, new_config, max_frames_out));
-       interleaver->add_output (children.back().sink ());
+       chunker->add_output (children.back().sink ());
+}
+
+void
+ExportGraphBuilder::ChannelConfig::remove_children (bool remove_out_files)
+{
+       boost::ptr_list<SilenceHandler>::iterator iter = children.begin();
+
+       while(iter != children.end() ) {
+
+               chunker->remove_output (iter->sink ());
+               iter->remove_children (remove_out_files);
+               iter = children.erase(iter);
+       }
 }
 
 bool