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/session_event.h"
  23 #include "ardour/transient_detector.h"
  24
  25 using namespace std;
  26 using namespace ARDOUR;
  27 using namespace PBD;
  28
  29 Analyser* Analyser::the_analyser = 0;
  30 Glib::Threads::Mutex Analyser::analysis_queue_lock;
  31 Glib::Threads::Cond  Analyser::SourcesToAnalyse;
  32 list<boost::weak_ptr<Source> > Analyser::analysis_queue;
  33
  34 Analyser::Analyser ()
  35 {
  36
  37 }
  38
  39 Analyser::~Analyser ()
  40 {
  41 }
  42
  43 static void
  44 analyser_work ()
  45 {
  46         Analyser::work ();
  47 }
  48
  49 void
  50 Analyser::init ()
  51 {
  52         Glib::Threads::Thread::create (sigc::ptr_fun (analyser_work));
  53 }
  54
  55 void
  56 Analyser::queue_source_for_analysis (boost::shared_ptr<Source> src, bool force)
  57 {
  58         if (!src->can_be_analysed()) {
  59                 return;
  60         }
  61
  62         if (!force && src->has_been_analysed()) {
  63                 return;
  64         }
  65
  66         Glib::Threads::Mutex::Lock lm (analysis_queue_lock);
  67         analysis_queue.push_back (boost::weak_ptr<Source>(src));
  68         SourcesToAnalyse.broadcast ();
  69 }
  70
  71 void
  72 Analyser::work ()
  73 {
  74         SessionEvent::create_per_thread_pool ("Analyser", 64);
  75
  76         while (true) {
  77                 analysis_queue_lock.lock ();
  78
  79           wait:
  80                 if (analysis_queue.empty()) {
  81                         SourcesToAnalyse.wait (analysis_queue_lock);
  82                 }
  83
  84                 if (analysis_queue.empty()) {
  85                         goto wait;
  86                 }
  87
  88                 boost::shared_ptr<Source> src (analysis_queue.front().lock());
  89                 analysis_queue.pop_front();
  90                 analysis_queue_lock.unlock ();
  91
  92                 boost::shared_ptr<AudioFileSource> afs = boost::dynamic_pointer_cast<AudioFileSource> (src);
  93
  94                 if (afs && afs->length(afs->timeline_position())) {
  95                         analyse_audio_file_source (afs);
  96                 }
  97         }
  98 }
  99
 100 void
 101 Analyser::analyse_audio_file_source (boost::shared_ptr<AudioFileSource> src)
 102 {
 103         AnalysisFeatureList results;
 104
 105         TransientDetector td (src->sample_rate());
 106
 107         if (td.run (src->get_transients_path(), src.get(), 0, results) == 0) {
 108                 src->set_been_analysed (true);
 109         } else {
 110                 src->set_been_analysed (false);
 111         }
 112
 113 }
 114