Move panner bypass state up to the PannerShell so that it is preserved even when...
[ardour2.git] / libs / ardour / strip_silence.cc
blob62b08cbb0a3114b1b4997e5d344e07cf3bf950f3
1 /*
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.
32 * @param s Session.
33 * @param threshold Threshold below which audio is considered silence, in dBFS.
34 * @param minimum_length Minimum length of silence period to recognise, in samples.
35 * @param fade_length Length of fade in/out to apply to trimmed regions, in samples.
38 StripSilence::StripSilence (Session & s, const AudioIntervalMap& sm, framecnt_t fade_length)
39 : Filter (s)
40 , _smap (sm)
41 , _fade_length (fade_length)
46 int
47 StripSilence::run (boost::shared_ptr<Region> r, Progress* progress)
49 results.clear ();
51 /* we only operate on AudioRegions, for now, though this could be adapted to MIDI
52 as well I guess
54 boost::shared_ptr<AudioRegion> region = boost::dynamic_pointer_cast<AudioRegion> (r);
55 InterThreadInfo itt;
56 AudioIntervalMap::const_iterator sm;
58 if (!region) {
59 results.push_back (r);
60 return -1;
63 if ((sm = _smap.find (r)) == _smap.end()) {
64 results.push_back (r);
65 return -1;
68 const AudioIntervalResult& silence = sm->second;
70 if (silence.size () == 1 && silence.front().first == 0 && silence.front().second == region->length() - 1) {
71 /* the region is all silence, so just return with nothing */
72 return 0;
75 if (silence.empty()) {
76 /* no silence in this region */
77 results.push_back (region);
78 return 0;
81 /* Turn the silence list into an `audible' list */
82 AudioIntervalResult audible;
84 /* Add the possible audible section at the start of the region */
85 AudioIntervalResult::const_iterator first_silence = silence.begin ();
86 if (first_silence->first != region->start()) {
87 audible.push_back (std::make_pair (r->start(), first_silence->first));
90 /* Add audible sections in the middle of the region */
91 for (AudioIntervalResult::const_iterator i = silence.begin (); i != silence.end(); ++i) {
92 AudioIntervalResult::const_iterator j = i;
93 ++j;
95 if (j != silence.end ()) {
96 audible.push_back (std::make_pair (i->second, j->first));
100 /* Add the possible audible section at the end of the region */
101 AudioIntervalResult::const_iterator last_silence = silence.end ();
102 --last_silence;
104 frameoffset_t const end_of_region = r->start() + r->length();
106 if (last_silence->second != end_of_region - 1) {
107 audible.push_back (std::make_pair (last_silence->second, end_of_region - 1));
110 int n = 0;
111 int const N = audible.size ();
113 for (AudioIntervalResult::const_iterator i = audible.begin(); i != audible.end(); ++i) {
115 PBD::PropertyList plist;
116 boost::shared_ptr<AudioRegion> copy;
118 plist.add (Properties::length, i->second - i->first);
119 plist.add (Properties::position, r->position() + (i->first - r->start()));
121 copy = boost::dynamic_pointer_cast<AudioRegion> (
122 RegionFactory::create (region, (i->first - r->start()), plist)
125 copy->set_name (RegionFactory::new_region_name (region->name ()));
127 framecnt_t const f = std::min (_fade_length, (i->second - i->first));
129 copy->set_fade_in_active (true);
130 copy->set_fade_in (FadeLinear, f);
131 copy->set_fade_out (FadeLinear, f);
132 results.push_back (copy);
134 if (progress && (n <= N)) {
135 progress->set_progress (float (n) / N);
139 return 0;