private void AddGraphLine(OxyPlot.PlotModel plotModel, MatchPair matchPair)
{
var lineSeries = new LineSeries();
lineSeries.Title = matchPair.Track1.Name + " <-> " + matchPair.Track2.Name;
lineSeries.TrackerFormatString = "{0}\n{1}: {2}\n{3}: {4}"; // bugfix https://github.com/oxyplot/oxyplot/issues/265
matchPair.Matches.OrderBy(match => match.Track1Time).ToList()
.ForEach(match => lineSeries.Points.Add(new DataPoint(
DateTimeAxis.ToDouble(match.Track1.Offset + match.Track1Time),
DateTimeAxis.ToDouble((match.Track1.Offset + match.Track1Time) - (match.Track2.Offset + match.Track2Time)))));
plotModel.Series.Add(lineSeries);
}
private bool IsInOtherCluster(MatchPair <T> matchPair)
{
// check, if a connection point (startnode or endnode) is already in another cluster
bool found = false;
foreach (var checkCluster in this.clusters)
{
if (checkCluster.Any(x => x.From.Equals(matchPair.From) || x.To.Equals(matchPair.To)))
{
// when found add to this cluster
checkCluster.Add(matchPair);
found = true;
break;
}
}
return(found);
}
private void correlationButton_Click(object sender, RoutedEventArgs e)
{
List <MatchGroup> trackGroups = DetermineMatchGroups();
foreach (MatchGroup trackGroup in trackGroups)
{
foreach (MatchPair trackPair in trackGroup.MatchPairs)
{
MatchPair localMP = trackPair;
Task.Factory.StartNew(() => {
TimeSpan t1Offset;
TimeSpan t2Offset;
if (localMP.Track1.Offset < localMP.Track2.Offset)
{
t1Offset = localMP.Track2.Offset - localMP.Track1.Offset;
t2Offset = TimeSpan.Zero;
}
else
{
t1Offset = TimeSpan.Zero;
t2Offset = localMP.Track1.Offset - localMP.Track2.Offset;
}
TimeSpan length;
if (localMP.Track1.Length > localMP.Track2.Length)
{
length = localMP.Track2.Length;
}
else
{
length = localMP.Track1.Length;
}
TimeSpan interval = CorrelationIntervalSize;
TimeSpan window = CorrelationWindowSize;
List <Match> computedMatches = new List <Match>();
for (TimeSpan position = TimeSpan.Zero; position < length; position += interval)
{
Interval t1Interval = new Interval((t1Offset + position).Ticks, (t1Offset + position + window).Ticks);
Interval t2Interval = new Interval((t2Offset + position).Ticks, (t2Offset + position + window).Ticks);
if (t1Interval.TimeTo >= localMP.Track1.Length || t2Interval.TimeTo >= localMP.Track2.Length)
{
// not enough samples remaining to compute the correlation (end of track reached)
break;
}
CrossCorrelation.Result ccr;
IAudioStream s1 = localMP.Track1.CreateAudioStream();
IAudioStream s2 = localMP.Track2.CreateAudioStream();
TimeSpan offset = CrossCorrelation.Calculate(s1, t1Interval, s2, t2Interval, progressMonitor, out ccr);
s1.Close();
s2.Close();
// always apply a positive offset that moves the match position inside the corelation interval,
// else it can happen that a negative offset is applied to a match at the beginning of the stream
// which means that the matching point would be at a negative position in the audio stream
computedMatches.Add(new Match {
Track1 = localMP.Track1, Track1Time = t1Offset + position + (offset < TimeSpan.Zero ? -offset : TimeSpan.Zero),
Track2 = localMP.Track2, Track2Time = t2Offset + position + (offset >= TimeSpan.Zero ? offset : TimeSpan.Zero),
Similarity = ccr.AbsoluteMaxValue,
Source = "CC"
});
}
Dispatcher.BeginInvoke((Action) delegate {
foreach (Match match in computedMatches)
{
multiTrackViewer.Matches.Add(match);
}
});
});
}
}
}
public override void Execute()
{
// build the graph
Graph <T> graph = new Graph <T>();
//graph.AddUndirectedEdge("Frankfurt", "Wiesbaden", 40);
//graph.AddUndirectedEdge("Frankfurt", "Mainz", 30);
//graph.AddUndirectedEdge("Mainz", "Wiesbaden", 15);
//graph.AddUndirectedEdge("Rüdesheim", "Geisenheim", 4);
foreach (var matchpair in this.matches)
{
graph.AddUndirectedEdge(matchpair.From, matchpair.To, matchpair.Cost);
}
// uses the FloyWarshall algorithm to compute the transitive closure this
// means to determine all possible ways in a graph (so you can check, if nodes have a way to each other in the graph)
FloydWarshall <T> transClosureAlgorithm = new FloydWarshall <T>();
transClosureAlgorithm.Execute(graph);
// now for all nodes in the graph e.g (Wiesbaden, Mainz, Frankfurt, Rüdesheim, Geisenheim)
for (int i = 0; i < transClosureAlgorithm.CostMatrix.GetLength(0); i++)
{
var cluster = new List <MatchPair <T> >();
T startNode = transClosureAlgorithm.Graph.Nodes[i].Value;
// loop through all nodes in the graph e.g (Wiesbaden, Mainz, Frankfurt, Rüdesheim, Geisenheim)
for (int j = 0; j < transClosureAlgorithm.CostMatrix.GetLength(0); j++)
{
T endNode = transClosureAlgorithm.Graph.Nodes[j].Value;
var cost = transClosureAlgorithm.CostMatrix[i, j];
// only when a way in the graph exits (waycosts != Infinity)
// and it is not himself (startNode != endNode)
if (cost != transClosureAlgorithm.Graph.Infinity &&
!startNode.Equals(endNode))
{
// a way exists
var matchPair = new MatchPair <T>(startNode, endNode, cost);
// checked if it is in the original list
if (this.matches.Contains(matchPair))
{
// check, if a connection point (startnode or endnode) is already in another cluster
var found = this.IsInOtherCluster(matchPair);
if (!found)
{
// add to the new cluster
cluster.Add(matchPair);
}
}
}
}
// when a cluster was build, add to the clusterlist
if (cluster.Count > 0)
{
this.clusters.Add(cluster);
}
// clusters will be e.g.
// Cluster 1: (Frankfurt, Wiesbaden, Mainz)
// Cluster 2: (Rüdesheim, Geisenheim)
}
}
public override void Execute()
{
// build the graph
Graph <T> graph = new Graph <T>();
//graph.AddUndirectedEdge("Frankfurt", "Wiesbaden", 40);
//graph.AddUndirectedEdge("Frankfurt", "Mainz", 30);
//graph.AddUndirectedEdge("Mainz", "Wiesbaden", 15);
//graph.AddUndirectedEdge("Rüdesheim", "Geisenheim", 4);
foreach (MatchPair <T> matchpair in this.matches)
{
graph.AddUndirectedEdge(matchpair.From, matchpair.To, matchpair.Cost);
}
BreadthFirstSearch <T> bfsSearch = new BreadthFirstSearch <T>();
// take every node from the graph as startnode for the search e.g. "Frankfurt", "Wiesbaden", "Mainz", "Rüdesheim", "Geisenheim"
GraphNode <T> startNode = null;
GraphNode <T> endNode = null;
int cost = graph.Infinity;
int i = 0;
while (i < graph.Nodes.Count)
{
var cluster = new List <MatchPair <T> >();
// take current node as startnode and search the whole graph for reachable nodes
startNode = (GraphNode <T>)graph.Nodes[i];
bfsSearch.Execute(startNode, null, null);
// add the found nodes to the subgraph
int j = 0;
while (j < bfsSearch.AllNodes.Count)
{
endNode = (GraphNode <T>)bfsSearch.AllNodes[j];
cost = startNode.CostToNeighbor(endNode);
if (!startNode.Equals(endNode))
{
var matchPair = new MatchPair <T>(startNode.Value, endNode.Value, cost);
// check, if it is in the original list
if (this.matches.Contains(matchPair))
{
// check, if a connection point (startnode or endnode) is already in another cluster
var found = this.IsInOtherCluster(matchPair);
if (!found)
{
// add to the new cluster
cluster.Add(matchPair);
}
}
}
j++;
}
// when a cluster was build, add to the clusterlist
if (cluster.Count > 0)
{
this.clusters.Add(cluster);
}
// clusters will be e.g.
// Cluster 1: (Frankfurt, Wiesbaden, Mainz)
// Cluster 2: (Rüdesheim, Geisenheim)
i++;
}
}