ceb1025c2c
git-svn-id: svn://localhost/ardour2/branches/3.0@7044 d708f5d6-7413-0410-9779-e7cbd77b26cf
126 lines
4.1 KiB
C++
126 lines
4.1 KiB
C++
/*
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Copyright (C) 2009 Paul Davis
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include "pbd/property_list.h"
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#include "ardour/strip_silence.h"
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#include "ardour/audioregion.h"
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#include "ardour/region_factory.h"
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#include "ardour/session.h"
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#include "ardour/dB.h"
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using namespace ARDOUR;
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/** Construct a StripSilence filter.
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* @param s Session.
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* @param threshold Threshold below which audio is considered silence, in dBFS.
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* @param minimum_length Minimum length of silence period to recognise, in samples.
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* @param fade_length Length of fade in/out to apply to trimmed regions, in samples.
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*/
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StripSilence::StripSilence (Session & s, double threshold, nframes_t minimum_length, nframes_t fade_length)
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: Filter (s), _threshold (threshold), _minimum_length (minimum_length), _fade_length (fade_length)
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{
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}
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int
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StripSilence::run (boost::shared_ptr<Region> r)
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{
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results.clear ();
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/* we only operate on AudioRegions, for now, though this could be adapted to MIDI
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as well I guess
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*/
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boost::shared_ptr<AudioRegion> region = boost::dynamic_pointer_cast<AudioRegion> (r);
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InterThreadInfo itt;
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if (!region) {
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results.push_back (r);
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return -1;
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}
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/* find periods of silence in the region */
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std::list<std::pair<frameoffset_t, framecnt_t> > const silence =
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region->find_silence (dB_to_coefficient (_threshold), _minimum_length, itt);
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if (silence.size () == 1 && silence.front().first == 0 && silence.front().second == region->length() - 1) {
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/* the region is all silence, so just return with nothing */
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return 0;
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}
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if (silence.empty()) {
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/* no silence in this region */
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results.push_back (region);
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return 0;
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}
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std::list<std::pair<framepos_t, framecnt_t > >::const_iterator s = silence.begin ();
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PBD::PropertyList plist;
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framepos_t start = 0;
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framepos_t end;
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bool in_silence;
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boost::shared_ptr<AudioRegion> copy;
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if (s->first == 0) {
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/* initial segment, starting at zero, is silent */
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end = s->second;
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in_silence = true;
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} else {
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/* initial segment, starting at zero, is audible */
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end = s->first;
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in_silence = false;
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}
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while (s != silence.end()) {
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framecnt_t interval_duration;
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interval_duration = end - start;
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if (!in_silence && interval_duration > 0) {
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plist.clear ();
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plist.add (Properties::length, interval_duration);
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plist.add (Properties::position, region->position() + start);
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copy = boost::dynamic_pointer_cast<AudioRegion> (RegionFactory::create
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(region, start, plist));
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copy->set_name (RegionFactory::new_region_name (region->name ()));
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std::cerr << "New silent delineated region called " << copy->name()
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<< " @ " << copy->start() << " length = " << copy->length() << " pos = " <<
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copy->position() << std::endl;
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copy->set_fade_in_active (true);
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copy->set_fade_in (AudioRegion::Linear, _fade_length);
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results.push_back (copy);
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}
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start = end;
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++s;
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end = s->first;
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in_silence = !in_silence;
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}
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return 0;
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}
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