X-Git-Url: http://git.johnwright.org/?p=fmit.git;a=blobdiff_plain;f=libs%2FMusic%2FQuantizer.cpp;fp=libs%2FMusic%2FQuantizer.cpp;h=1e6a6c008f5f5c620b8001075a759be220213cff;hp=0000000000000000000000000000000000000000;hb=a8fb82288feb6b258f2c04312f0c36ba8d79b494;hpb=adfba0402927438a1869f1e716bcf0e25574ce1e

diff --git a/libs/Music/Quantizer.cpp b/libs/Music/Quantizer.cpp
new file mode 100644
index 0000000..1e6a6c0
--- /dev/null
+++ b/libs/Music/Quantizer.cpp
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+// Copyright 2005 "Gilles Degottex"
+
+// This file is part of "Music"
+
+// "Music" is free software; you can redistribute it and/or modify
+// it under the terms of the GNU Lesser General Public License as published by
+// the Free Software Foundation; either version 2.1 of the License, or
+// (at your option) any later version.
+// 
+// "Music" 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 Lesser General Public License for more details.
+// 
+// You should have received a copy of the GNU Lesser General Public License
+// along with this program; if not, write to the Free Software
+// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+
+
+#include "Quantizer.h"
+
+#include <iostream>
+using namespace std;
+#include <Music/Music.h>
+using namespace Music;
+#include <CppAddons/Random.h>
+
+Quantizer::Quantizer(float tolerance, float min_density)
+{
+	m_min_ht = -48;
+	m_channels.resize(97);
+
+	m_tolerance = tolerance;
+	m_min_density = min_density;
+
+	m_time.start();
+}
+
+void Quantizer::quantize(const vector<bool> hts, int min_ht)
+{
+	double current_time = m_time.elapsed();
+
+	m_min_stored_recon = 1000000;
+	for(size_t ht=0; ht<hts.size(); ht++)
+	{
+		int rht = ht+min_ht-m_min_ht;
+
+		// add the new one
+		m_channels[rht].old_states.push_front(State(current_time, hts[ht]));
+
+		m_min_stored_recon = min(m_min_stored_recon, int(m_channels[rht].old_states.size()));
+
+		// update channel
+		update(rht);
+
+		// drop unused recognitions
+		while(!m_channels[rht].old_states.empty() && (current_time-m_channels[rht].old_states.back().time>m_tolerance))
+			m_channels[rht].old_states.pop_back();
+	}
+}
+
+void Quantizer::update(int rht)
+{
+	Channel& channel = m_channels[rht];
+
+	if(!channel.old_states.empty())
+	{
+		// compute density
+		int dens = 0;
+		for(size_t i=0; i<channel.old_states.size(); i++)
+			if(channel.old_states[i].play)
+				dens++;
+
+		channel.reliability = float(dens)/channel.old_states.size();
+
+		// if a density is strong enough (depend of parameter dens_required)
+		if(channel.reliability>m_min_density)
+		{
+			if(channel.state==Channel::QC_NOTHING)
+			{
+				channel.state = Channel::QC_STARTING;
+				channel.duration.start();
+				channel.lag.start();
+			}
+
+			if(channel.state==Channel::QC_STARTING)
+			{
+				if(channel.lag.elapsed()>m_tolerance)
+				{
+					channel.state = Channel::QC_PLAYING;
+					channel.last_tag = Random::s_random.nextInt();
+					MFireEvent(noteStarted(channel.last_tag, rht+m_min_ht, -channel.lag.elapsed()));
+				}
+			}
+
+			if(channel.state==Channel::QC_PLAYING)
+				channel.lag.start();
+		}
+		else
+		{
+			if(channel.state==Channel::QC_STARTING)
+				channel.state = Channel::QC_NOTHING;
+			else if(channel.state==Channel::QC_PLAYING && channel.lag.elapsed()>m_tolerance)
+			{
+				channel.state = Channel::QC_NOTHING;
+				MFireEvent(noteFinished(channel.last_tag, rht+m_min_ht, -channel.lag.elapsed()));
+				MFireEvent(notePlayed(rht+m_min_ht, channel.duration.elapsed()-channel.lag.elapsed(), -channel.lag.elapsed()-channel.duration.elapsed()));
+			}
+		}
+	}
+}
+
+void Quantizer::cutAll()
+{
+	m_min_stored_recon = 0;
+	for(size_t ht=0; ht<m_channels.size(); ht++)
+	{
+		m_channels[ht].old_states.clear();
+		update(ht+m_min_ht);
+	}
+}
+