2 Copyright (C) 2009-2010 Paul Davis
4 This program is free software; you can redistribute it and/or modify
5 it under the terms of the GNU General Public License as published by
6 the Free Software Foundation; either version 2 of the License, or
7 (at your option) any later version.
9 This program is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 GNU General Public License for more details.
14 You should have received a copy of the GNU General Public License
15 along with this program; if not, write to the Free Software
16 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
20 #include "pbd/property_list.h"
22 #include "ardour/strip_silence.h"
23 #include "ardour/audioregion.h"
24 #include "ardour/region_factory.h"
25 #include "ardour/session.h"
26 #include "ardour/dB.h"
27 #include "ardour/progress.h"
29 using namespace ARDOUR;
31 /** Construct a StripSilence filter.
33 * @param sm Silences to remove.
34 * @param fade_length Length of fade in/out to apply to trimmed regions, in samples.
37 StripSilence::StripSilence (Session & s, const AudioIntervalMap& sm, framecnt_t fade_length)
40 , _fade_length (fade_length)
46 StripSilence::run (boost::shared_ptr<Region> r, Progress* progress)
50 /* we only operate on AudioRegions, for now, though this could be adapted to MIDI
53 boost::shared_ptr<AudioRegion> region = boost::dynamic_pointer_cast<AudioRegion> (r);
55 AudioIntervalMap::const_iterator sm;
58 results.push_back (r);
62 if ((sm = _smap.find (r)) == _smap.end()) {
63 results.push_back (r);
67 const AudioIntervalResult& silence = sm->second;
69 if (silence.size () == 1 && silence.front().first == 0 && silence.front().second == region->length() - 1) {
70 /* the region is all silence, so just return with nothing */
74 if (silence.empty()) {
75 /* no silence in this region */
76 results.push_back (region);
80 /* Turn the silence list into an `audible' list */
81 AudioIntervalResult audible;
83 /* Add the possible audible section at the start of the region */
84 AudioIntervalResult::const_iterator first_silence = silence.begin ();
85 if (first_silence->first != region->start()) {
86 audible.push_back (std::make_pair (r->start(), first_silence->first));
89 /* Add audible sections in the middle of the region */
90 for (AudioIntervalResult::const_iterator i = silence.begin (); i != silence.end(); ++i) {
91 AudioIntervalResult::const_iterator j = i;
94 if (j != silence.end ()) {
95 audible.push_back (std::make_pair (i->second, j->first));
99 /* Add the possible audible section at the end of the region */
100 AudioIntervalResult::const_iterator last_silence = silence.end ();
103 frameoffset_t const end_of_region = r->start() + r->length();
105 if (last_silence->second != end_of_region - 1) {
106 audible.push_back (std::make_pair (last_silence->second, end_of_region - 1));
110 int const N = audible.size ();
112 for (AudioIntervalResult::const_iterator i = audible.begin(); i != audible.end(); ++i) {
114 PBD::PropertyList plist;
115 boost::shared_ptr<AudioRegion> copy;
117 plist.add (Properties::length, i->second - i->first);
118 plist.add (Properties::position, r->position() + (i->first - r->start()));
120 copy = boost::dynamic_pointer_cast<AudioRegion> (
121 RegionFactory::create (region, (i->first - r->start()), plist)
124 copy->set_name (RegionFactory::new_region_name (region->name ()));
126 framecnt_t const f = std::min (_fade_length, (i->second - i->first));
128 copy->set_fade_in_active (true);
129 copy->set_fade_in (FadeLinear, f);
130 copy->set_fade_out (FadeLinear, f);
131 results.push_back (copy);
133 if (progress && (n <= N)) {
134 progress->set_progress (float (n) / N);