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+/* -*- c-basic-offset: 4 indent-tabs-mode: nil -*-  vi:set ts=8 sts=4 sw=4: */
-:7bf67d2dfc30
+/*
     This file is Copyright (c) 2012 Chris Cannam
     Permission is hereby granted, free of charge, to any person
     obtaining a copy of this software and associated documentation
     files (the "Software"), to deal in the Software without
     restriction, including without limitation the rights to use, copy,
     modify, merge, publish, distribute, sublicense, and/or sell copies
     of the Software, and to permit persons to whom the Software is
     furnished to do so, subject to the following conditions:
     The above copyright notice and this permission notice shall be
     included in all copies or substantial portions of the Software.
     THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
     EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
     MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
     NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR
     ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF
     CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
     WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 */
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+            Chris
 #include "NoteHypothesis.h"
 #include <cmath>
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+using Vamp::RealTime;
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+            Chris
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+NoteHypothesis::NoteHypothesis(float slack) :
     m_state(New),
     m_slack(slack)
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+            Chris
+}
 NoteHypothesis::~NoteHypothesis()
+{
+}
 bool
 NoteHypothesis::isWithinTolerance(Estimate s) const
+{
     if (m_pending.empty()) {
         return true;
+    }
     // check we are within a relatively close tolerance of the last
     // candidate
     Estimate last = m_pending[m_pending.size()-1];
     double r = s.freq / last.freq;
     int cents = lrint(1200.0 * (log(r) / log(2.0)));
     if (cents < -60 || cents > 60) return false;
     // and within a slightly bigger tolerance of the current mean
     double meanFreq = getMeanFrequency();
     r = s.freq / meanFreq;
     cents = lrint(1200.0 * (log(r) / log(2.0)));
     if (cents < -80 || cents > 80) return false;
     return true;
+}
 bool
 NoteHypothesis::isOutOfDateFor(Estimate s) const
+{
     if (m_pending.empty()) return false;
     return ((s.time - m_pending[m_pending.size()-1].time) >
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+            RealTime::fromMilliseconds(m_slack));
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+            Chris
 bool
 NoteHypothesis::isSatisfied() const
+{
     if (m_pending.empty()) return false;
     double meanConfidence = 0.0;
     for (int i = 0; i < (int)m_pending.size(); ++i) {
         meanConfidence += m_pending[i].confidence;
+    }
     meanConfidence /= m_pending.size();
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+    int lengthRequired = 100;
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+    if (meanConfidence > 0.0) {
         lengthRequired = int(2.0 / meanConfidence + 0.5);
+    }
     return ((int)m_pending.size() > lengthRequired);
+}
 bool
 NoteHypothesis::accept(Estimate s)
+{
     bool accept = false;
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+    static double negligibleConfidence = 0.0001;
     if (s.confidence < negligibleConfidence) {
         // avoid piling up a lengthy sequence of estimates that are
         // all acceptable but are in total not enough to cause us to
         // be satisfied
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+        if (m_pending.empty()) {
             m_state = Rejected;
+        }
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+        return false;
+    }
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+    switch (m_state) {
     case New:
         m_state = Provisional;
         accept = true;
         break;
     case Provisional:
         if (isOutOfDateFor(s)) {
             m_state = Rejected;
         } else if (isWithinTolerance(s)) {
             accept = true;
+        }
         break;
     case Satisfied:
         if (isOutOfDateFor(s)) {
             m_state = Expired;
         } else if (isWithinTolerance(s)) {
             accept = true;
+        }
         break;
     case Rejected:
         break;
     case Expired:
         break;
+    }
     if (accept) {
         m_pending.push_back(s);
         if (m_state == Provisional && isSatisfied()) {
             m_state = Satisfied;
+        }
+    }
     return accept;
+}
 NoteHypothesis::State
 NoteHypothesis::getState() const
+{
     return m_state;
+}
 NoteHypothesis::Estimates
 NoteHypothesis::getAcceptedEstimates() const
+{
     if (m_state == Satisfied || m_state == Expired) {
         return m_pending;
     } else {
         return Estimates();
+    }
+}
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+RealTime
 NoteHypothesis::getStartTime() const
+{
     if (!(m_state == Satisfied || m_state == Expired)) {
         return RealTime::zeroTime;
     } else {
         return m_pending.begin()->time;
+    }
+}
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+double
 NoteHypothesis::getMeanFrequency() const
+{
     double acc = 0.0;
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+    if (m_pending.empty()) return acc;
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+    for (int i = 0; i < (int)m_pending.size(); ++i) {
         acc += m_pending[i].freq;
+    }
     acc /= m_pending.size();
     return acc;
+}
 NoteHypothesis::Note
 NoteHypothesis::getAveragedNote() const
+{
     Note n;
     if (!(m_state == Satisfied || m_state == Expired)) {
         n.freq = 0.0;
         n.time = RealTime::zeroTime;
         n.duration = RealTime::zeroTime;
         return n;
+    }
     n.time = m_pending.begin()->time;
     Estimates::const_iterator i = m_pending.end();
     --i;
     n.duration = i->time - n.time;
     // just mean frequency for now, but this isn't at all right perceptually
     n.freq = getMeanFrequency();
     return n;
+}