onset_detector.cc

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/*
    Copyright (C) 2012 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 <cmath>
#include "ardour/onset_detector.h"

#include "i18n.h"

using namespace Vamp;
using namespace ARDOUR;
using namespace std;

/* need a static initializer function for this */

string OnsetDetector::_op_id = X_("libardourvampplugins:aubioonset:2");

OnsetDetector::OnsetDetector (float sr)
        : AudioAnalyser (sr, X_("libardourvampplugins:aubioonset"))
        , current_results (0)
{
        /* update the op_id */

        _op_id = X_("libardourvampplugins:aubioonset");

        // XXX this should load the above-named plugin and get the current version

        _op_id += ":2";
}

OnsetDetector::~OnsetDetector()
{
}

string
OnsetDetector::operational_identifier()
{
        return _op_id;
}

int
OnsetDetector::run (const std::string& path, Readable* src, uint32_t channel, AnalysisFeatureList& results)
{
        current_results = &results;
        int ret = analyse (path, src, channel);

        current_results = 0;
        return ret;
}

int
OnsetDetector::use_features (Plugin::FeatureSet& features, ostream* out)
{
        const Plugin::FeatureList& fl (features[0]);

        for (Plugin::FeatureList::const_iterator f = fl.begin(); f != fl.end(); ++f) {

                if ((*f).hasTimestamp) {

                        if (out) {
                                (*out) << (*f).timestamp.toString() << endl;
                        }

                        current_results->push_back (RealTime::realTime2Frame ((*f).timestamp, (framecnt_t) floor(sample_rate)));
                }
        }

        return 0;
}

void
OnsetDetector::set_silence_threshold (float val)
{
        if (plugin) {
                plugin->setParameter ("silencethreshold", val);
        }
}

void
OnsetDetector::set_peak_threshold (float val)
{
        if (plugin) {
                plugin->setParameter ("peakpickthreshold", val);
        }
}

void
OnsetDetector::set_function (int val)
{
        if (plugin) {
                plugin->setParameter ("onsettype", (float) val);
        }
}

void
OnsetDetector::cleanup_onsets (AnalysisFeatureList& t, float sr, float gap_msecs)
{
        if (t.empty()) {
                return;
        }

        t.sort ();

        /* remove duplicates or other things that are too close */

        AnalysisFeatureList::iterator i = t.begin();
        AnalysisFeatureList::iterator f, b;
        const framecnt_t gap_frames = (framecnt_t) floor (gap_msecs * (sr / 1000.0));

        while (i != t.end()) {

                // move front iterator to just past i, and back iterator the same place

                f = i;
                ++f;
                b = f;

                // move f until we find a new value that is far enough away

                while ((f != t.end()) && (((*f) - (*i)) < gap_frames)) {
                        ++f;
                }

                i = f;

                // if f moved forward from b, we had duplicates/too-close points: get rid of them

                if (b != f) {
                        t.erase (b, f);
                }
        }
}