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