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 #include "pbd/pthread_utils.h"
  26 #include "pbd/convert.h"
  27
  28 using namespace std;
  29 using namespace ARDOUR;
  30 using namespace PBD;
  31
  32 Analyser* Analyser::the_analyser = 0;
  33 Glib::StaticMutex Analyser::analysis_queue_lock = GLIBMM_STATIC_MUTEX_INIT;
  34 Glib::Cond* Analyser::SourcesToAnalyse = 0;
  35 list<boost::weak_ptr<Source> > Analyser::analysis_queue;
  36
  37 Analyser::Analyser ()
  38 {
  39
  40 }
  41
  42 Analyser::~Analyser ()
  43 {
  44 }
  45
  46 static void
  47 analyser_work ()
  48 {
  49         Analyser::work ();
  50 }
  51
  52 void
  53 Analyser::init ()
  54 {
  55         SourcesToAnalyse = new Glib::Cond();
  56         Glib::Thread::create (sigc::ptr_fun (analyser_work), false);
  57 }
  58
  59 void
  60 Analyser::queue_source_for_analysis (boost::shared_ptr<Source> src, bool force)
  61 {
  62         if (!src->can_be_analysed()) {
  63                 return;
  64         }
  65
  66         if (!force && src->has_been_analysed()) {
  67                 return;
  68         }
  69
  70         Glib::Mutex::Lock lm (analysis_queue_lock);
  71         analysis_queue.push_back (boost::weak_ptr<Source>(src));
  72         SourcesToAnalyse->broadcast ();
  73 }
  74
  75 void
  76 Analyser::work ()
  77 {
  78         SessionEvent::create_per_thread_pool ("Analyser", 64);
  79
  80         while (true) {
  81                 analysis_queue_lock.lock ();
  82
  83           wait:
  84                 if (analysis_queue.empty()) {
  85                         SourcesToAnalyse->wait (analysis_queue_lock);
  86                 }
  87
  88                 if (analysis_queue.empty()) {
  89                         goto wait;
  90                 }
  91
  92                 boost::shared_ptr<Source> src (analysis_queue.front().lock());
  93                 analysis_queue.pop_front();
  94                 analysis_queue_lock.unlock ();
  95
  96                 boost::shared_ptr<AudioFileSource> afs = boost::dynamic_pointer_cast<AudioFileSource> (src);
  97
  98                 if (afs && afs->length(afs->timeline_position())) {
  99                         analyse_audio_file_source (afs);
 100                 }
 101         }
 102 }
 103
 104 void
 105 Analyser::analyse_audio_file_source (boost::shared_ptr<AudioFileSource> src)
 106 {
 107         AnalysisFeatureList results;
 108
 109         TransientDetector td (src->sample_rate());
 110
 111         if (td.run (src->get_transients_path(), src.get(), 0, results) == 0) {
 112                 src->set_been_analysed (true);
 113         } else {
 114                 src->set_been_analysed (false);
 115         }
 116
 117 }
 118