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/progress.h"
27 using namespace ARDOUR;
29 /** Construct a StripSilence filter.
31 * @param sm Silences to remove.
32 * @param fade_length Length of fade in/out to apply to trimmed regions, in samples.
35 StripSilence::StripSilence (Session & s, const AudioIntervalMap& sm, framecnt_t fade_length)
38 , _fade_length (fade_length)
44 StripSilence::run (boost::shared_ptr<Region> r, Progress* progress)
48 /* we only operate on AudioRegions, for now, though this could be adapted to MIDI
51 boost::shared_ptr<AudioRegion> region = boost::dynamic_pointer_cast<AudioRegion> (r);
53 AudioIntervalMap::const_iterator sm;
56 results.push_back (r);
60 if ((sm = _smap.find (r)) == _smap.end()) {
61 results.push_back (r);
65 const AudioIntervalResult& silence = sm->second;
67 if (silence.size () == 1 && silence.front().first == 0 && silence.front().second == region->length() - 1) {
68 /* the region is all silence, so just return with nothing */
72 if (silence.empty()) {
73 /* no silence in this region */
74 results.push_back (region);
78 /* Turn the silence list into an `audible' list */
79 AudioIntervalResult audible;
81 /* Add the possible audible section at the start of the region */
82 AudioIntervalResult::const_iterator first_silence = silence.begin ();
83 if (first_silence->first != region->start()) {
84 audible.push_back (std::make_pair (r->start(), first_silence->first));
87 /* Add audible sections in the middle of the region */
88 for (AudioIntervalResult::const_iterator i = silence.begin (); i != silence.end(); ++i) {
89 AudioIntervalResult::const_iterator j = i;
92 if (j != silence.end ()) {
93 audible.push_back (std::make_pair (i->second, j->first));
97 /* Add the possible audible section at the end of the region */
98 AudioIntervalResult::const_iterator last_silence = silence.end ();
101 frameoffset_t const end_of_region = r->start() + r->length();
103 if (last_silence->second < end_of_region - 1) {
104 audible.push_back (std::make_pair (last_silence->second, end_of_region - 1));
108 int const N = audible.size ();
110 for (AudioIntervalResult::const_iterator i = audible.begin(); i != audible.end(); ++i, ++n) {
112 PBD::PropertyList plist;
113 boost::shared_ptr<AudioRegion> copy;
115 plist.add (Properties::length, i->second - i->first);
116 plist.add (Properties::position, r->position() + (i->first - r->start()));
118 copy = boost::dynamic_pointer_cast<AudioRegion> (
119 RegionFactory::create (region, (i->first - r->start()), plist)
122 copy->set_name (RegionFactory::new_region_name (region->name ()));
124 framecnt_t const f = std::min (_fade_length, (i->second - i->first) / 2);
127 copy->set_fade_in_active (true);
128 copy->set_fade_out_active (true);
129 copy->set_fade_in (FadeLinear, f);
130 copy->set_fade_out (FadeLinear, f);
132 copy->set_fade_in_active (false);
133 copy->set_fade_out_active (false);
135 results.push_back (copy);
137 if (progress && (n <= N)) {
138 progress->set_progress (float (n) / N);