analyser.cc

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/*
    Copyright (C) 2008 Paul Davis

    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation; either version 2 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program; if not, write to the Free Software
    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.

*/

#include "ardour/analyser.h"
#include "ardour/audiofilesource.h"
#include "ardour/session_event.h"
#include "ardour/transient_detector.h"

#include "pbd/compose.h"
#include "pbd/error.h"
#include "i18n.h"

using namespace std;
using namespace ARDOUR;
using namespace PBD;

Analyser* Analyser::the_analyser = 0;
Glib::Threads::Mutex Analyser::analysis_queue_lock;
Glib::Threads::Cond  Analyser::SourcesToAnalyse;
list<boost::weak_ptr<Source> > Analyser::analysis_queue;

Analyser::Analyser ()
{

}

Analyser::~Analyser ()
{
}

static void
analyser_work ()
{
        Analyser::work ();
}

void
Analyser::init ()
{
        Glib::Threads::Thread::create (sigc::ptr_fun (analyser_work));
}

void
Analyser::queue_source_for_analysis (boost::shared_ptr<Source> src, bool force)
{
        if (!src->can_be_analysed()) {
                return;
        }

        if (!force && src->has_been_analysed()) {
                return;
        }

        Glib::Threads::Mutex::Lock lm (analysis_queue_lock);
        analysis_queue.push_back (boost::weak_ptr<Source>(src));
        SourcesToAnalyse.broadcast ();
}

void
Analyser::work ()
{
        SessionEvent::create_per_thread_pool ("Analyser", 64);

        while (true) {
                analysis_queue_lock.lock ();

          wait:
                if (analysis_queue.empty()) {
                        SourcesToAnalyse.wait (analysis_queue_lock);
                }

                if (analysis_queue.empty()) {
                        goto wait;
                }

                boost::shared_ptr<Source> src (analysis_queue.front().lock());
                analysis_queue.pop_front();
                analysis_queue_lock.unlock ();

                boost::shared_ptr<AudioFileSource> afs = boost::dynamic_pointer_cast<AudioFileSource> (src);

                if (afs && afs->length(afs->timeline_position())) {
                        analyse_audio_file_source (afs);
                }
        }
}

void
Analyser::analyse_audio_file_source (boost::shared_ptr<AudioFileSource> src)
{
        AnalysisFeatureList results;

        try {
                TransientDetector td (src->sample_rate());
                if (td.run (src->get_transients_path(), src.get(), 0, results) == 0) {
                        src->set_been_analysed (true);
                } else {
                        src->set_been_analysed (false);
                }
        } catch (...) {
                error << string_compose(_("Transient Analysis failed for %1."), _("Audio File Source")) << endmsg;;
                src->set_been_analysed (false);
                return;
        }
}