libs/ardour/analyser.cc

   1 /*
   2     Copyright (C) 2008 Paul Davis
   3
   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.
   8
   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.
  13
  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.
  17
  18 */
  19
  20 #include "ardour/analyser.h"
  21 #include "ardour/audiofilesource.h"
  22 #include "ardour/rc_configuration.h"
  23 #include "ardour/session_event.h"
  24 #include "ardour/transient_detector.h"
  25
  26 #include "pbd/compose.h"
  27 #include "pbd/error.h"
  28 #include "pbd/i18n.h"
  29
  30 using namespace std;
  31 using namespace ARDOUR;
  32 using namespace PBD;
  33
  34 Analyser* Analyser::the_analyser = 0;
  35 Glib::Threads::Mutex Analyser::analysis_active_lock;
  36 Glib::Threads::Mutex Analyser::analysis_queue_lock;
  37 Glib::Threads::Cond  Analyser::SourcesToAnalyse;
  38 list<boost::weak_ptr<Source> > Analyser::analysis_queue;
  39
  40 Analyser::Analyser ()
  41 {
  42
  43 }
  44
  45 Analyser::~Analyser ()
  46 {
  47 }
  48
  49 static void
  50 analyser_work ()
  51 {
  52         Analyser::work ();
  53 }
  54
  55 void
  56 Analyser::init ()
  57 {
  58         Glib::Threads::Thread::create (sigc::ptr_fun (analyser_work));
  59 }
  60
  61 void
  62 Analyser::queue_source_for_analysis (boost::shared_ptr<Source> src, bool force)
  63 {
  64         if (!src->can_be_analysed()) {
  65                 return;
  66         }
  67
  68         if (!force && src->has_been_analysed()) {
  69                 return;
  70         }
  71
  72         Glib::Threads::Mutex::Lock lm (analysis_queue_lock);
  73         analysis_queue.push_back (boost::weak_ptr<Source>(src));
  74         SourcesToAnalyse.broadcast ();
  75 }
  76
  77 void
  78 Analyser::work ()
  79 {
  80         SessionEvent::create_per_thread_pool ("Analyser", 64);
  81
  82         while (true) {
  83                 analysis_queue_lock.lock ();
  84
  85           wait:
  86                 if (analysis_queue.empty()) {
  87                         SourcesToAnalyse.wait (analysis_queue_lock);
  88                 }
  89
  90                 if (analysis_queue.empty()) {
  91                         goto wait;
  92                 }
  93
  94                 boost::shared_ptr<Source> src (analysis_queue.front().lock());
  95                 analysis_queue.pop_front();
  96                 analysis_queue_lock.unlock ();
  97
  98                 boost::shared_ptr<AudioFileSource> afs = boost::dynamic_pointer_cast<AudioFileSource> (src);
  99
 100                 if (afs && afs->length(afs->timeline_position())) {
 101                         Glib::Threads::Mutex::Lock lm (analysis_active_lock);
 102                         analyse_audio_file_source (afs);
 103                 }
 104         }
 105 }
 106
 107 void
 108 Analyser::analyse_audio_file_source (boost::shared_ptr<AudioFileSource> src)
 109 {
 110         AnalysisFeatureList results;
 111
 112         try {
 113                 TransientDetector td (src->sample_rate());
 114                 td.set_sensitivity (3, Config->get_transient_sensitivity()); // "General purpose"
 115                 if (td.run (src->get_transients_path(), src.get(), 0, results) == 0) {
 116                         src->set_been_analysed (true);
 117                 } else {
 118                         src->set_been_analysed (false);
 119                 }
 120         } catch (...) {
 121                 error << string_compose(_("Transient Analysis failed for %1."), _("Audio File Source")) << endmsg;;
 122                 src->set_been_analysed (false);
 123                 return;
 124         }
 125 }
 126
 127 void
 128 Analyser::flush ()
 129 {
 130         Glib::Threads::Mutex::Lock lq (analysis_queue_lock);
 131         Glib::Threads::Mutex::Lock la (analysis_active_lock);
 132         analysis_queue.clear();
 133 }