public List <bool[]> CreateFingerprintsFromLogSpectrum(
double[][] logarithmizedSpectrum, IStride stride, int fingerprintLength, int overlap, int topWavelets)
{
DbgTimer t = new DbgTimer();
t.Start();
// Cut the logaritmic spectrogram into smaller spectrograms with one stride between each
List <double[][]> spectralImages = SpectrumService.CutLogarithmizedSpectrum(logarithmizedSpectrum, stride, fingerprintLength, overlap);
// Then apply the wavelet transform on them to later reduce the resolution
// do this in place
WaveletService.ApplyWaveletTransformInPlace(spectralImages);
// Then for each of the wavelet reduce the resolution by only keeping the top wavelets
// and ignore the magnitude of the top wavelets.
// Instead, we can simply keep the sign of it (+/-).
// This information is enough to keep the extract perceptual characteristics of a song.
List <bool[]> fingerprints = new List <bool[]>();
foreach (var spectralImage in spectralImages)
{
bool[] image = FingerprintDescriptor.ExtractTopWavelets(spectralImage, topWavelets);
fingerprints.Add(image);
}
Dbg.WriteLine("Created {1} Fingerprints from Log Spectrum - Execution Time: {0} ms", t.Stop().TotalMilliseconds, fingerprints.Count);
return(fingerprints);
}
/// <summary>
/// Find Similar Tracks using passed audio samples as input and return a Dictionary
/// </summary>
/// <param name="lshHashTables">Number of hash tables from the database</param>
/// <param name="lshGroupsPerKey">Number of groups per hash table</param>
/// <param name="thresholdTables">Minimum number of hash tables that must be found for one signature to be considered a candidate (0 and 1 = return all candidates, 2+ = return only exact matches)</param>
/// <param name="param">Audio File Work Unit Parameter Object</param>
/// <returns>a dictionary of perceptually similar tracks</returns>
public Dictionary <Track, double> FindSimilarFromAudioSamples(
int lshHashTables,
int lshGroupsPerKey,
int thresholdTables,
WorkUnitParameterObject param)
{
DbgTimer t = new DbgTimer();
t.Start();
// Get fingerprints
double[][] logSpectrogram;
List <bool[]> signatures = fingerprintService.CreateFingerprintsFromAudioSamples(param.AudioSamples, param, out logSpectrogram);
long elapsedMiliseconds = 0;
// Query the database using Min Hash
Dictionary <int, QueryStats> allCandidates = QueryFingerprintManager.QueryOneSongMinHash(
signatures,
dbService,
minHash,
lshHashTables,
lshGroupsPerKey,
thresholdTables,
ref elapsedMiliseconds);
IEnumerable <int> ids = allCandidates.Select(p => p.Key);
IList <Track> tracks = dbService.ReadTrackById(ids);
// Order by Hamming Similarity
// Using PLINQ
//OrderedParallelQuery<KeyValuePair<int, QueryStats>> order = allCandidates.AsParallel()
IOrderedEnumerable <KeyValuePair <int, QueryStats> > order = allCandidates
.OrderBy((pair) => pair.Value.OrderingValue =
pair.Value.HammingDistance / pair.Value.NumberOfTotalTableVotes
+ 0.4 * pair.Value.MinHammingDistance);
// Join on the ID properties.
var joined = from o in order
join track in tracks on o.Key equals track.Id
select new { track, o.Value.Similarity };
Dictionary <Track, double> stats = joined.ToDictionary(Key => Key.track, Value => Value.Similarity);
Dbg.WriteLine("Find Similar From Audio Samples - Total Execution Time: {0} ms", t.Stop().TotalMilliseconds);
return(stats);
}
private static void Test()
{
mirageaudio_initgst();
string song1_filename = "/home/lorentz/Music/Library/Pachelbel/Johann Pachelbel - Canon And Gigue In D Major For 3 Violins And Basso Continuo.mp3";
string song2_filename = "/home/lorentz/Music/Library/Karajan Adagios/CD 1/Pachelbel - Canon in d Major (Kanon And Gigue in d Major = d Dur) av Johann Pachelbel.mp3";
Scms song1 = null;
Scms song2 = null;
DbgTimer t1 = new DbgTimer();
t1.Start();
int runs = 10;
for (int i = 0; i < runs; i++)
{
Analyzer.Analyze(song1_filename);
}
long l1 = 0;
t1.Stop(ref l1);
Dbg.WriteLine("Analysis: " + runs + " times - " + l1 + "ms; " +
(double)l1 / (double)runs + "ms per analysis");
song1 = Analyzer.Analyze(song1_filename);
song2 = Analyzer.Analyze(song2_filename);
ScmsConfiguration config = new ScmsConfiguration(Analyzer.MFCC_COEFFICIENTS);
Console.WriteLine("Distance = " + Scms.Distance(song1, song2, config));
DbgTimer t2 = new DbgTimer();
t2.Start();
runs = 100000;
for (int i = 0; i < runs; i++)
{
Scms.Distance(song1, song2, config);
}
long l2 = 0;
t2.Stop(ref l2);
Dbg.WriteLine("Distance Computation: " + runs + " times - " + l2 + "ms; " +
(double)l2 / (double)runs + "ms per comparison");
}
public double[][] CreateLogSpectrogram(
float[] samples, IWindowFunction windowFunction, AudioServiceConfiguration configuration)
{
DbgTimer t = new DbgTimer();
t.Start();
if (configuration.NormalizeSignal)
{
NormalizeInPlace(samples);
}
int width = (samples.Length - configuration.WindowSize) / configuration.Overlap; /*width of the image*/
double[][] frames = new double[width][];
int[] logFrequenciesIndexes = GenerateLogFrequencies(configuration);
double[] window = windowFunction.GetWindow();
for (int i = 0; i < width; i++)
{
double[] complexSignal = new double[2 * configuration.WindowSize]; /*even - Re, odd - Img, thats how Exocortex works*/
// take 371 ms each 11.6 ms (2048 samples each 64 samples, samplerate 5512)
// or 256 ms each 16 ms (8192 samples each 512 samples, samplerate 32000)
for (int j = 0; j < configuration.WindowSize; j++)
{
// Weight by Hann Window
complexSignal[2 * j] = window[j] * samples[(i * configuration.Overlap) + j];
// need to clear out as fft modifies buffer (phase)
complexSignal[(2 * j) + 1] = 0;
}
lomonFFT.TableFFT(complexSignal, true);
frames[i] = ExtractLogBins(complexSignal, logFrequenciesIndexes, configuration.LogBins);
}
Dbg.WriteLine("Create Log Spectrogram - Execution Time: {0} ms", t.Stop().TotalMilliseconds);
return(frames);
}
/// <summary>
/// Find Similar Tracks using passed audio samples as input and return a List
/// </summary>
/// <param name="lshHashTables">Number of hash tables from the database</param>
/// <param name="lshGroupsPerKey">Number of groups per hash table</param>
/// <param name="thresholdTables">Minimum number of hash tables that must be found for one signature to be considered a candidate (0 and 1 = return all candidates, 2+ = return only exact matches)</param>
/// <param name="param">Audio File Work Unit Parameter Object</param>
/// <param name="optimizeSignatureCount">Reduce the number of signatures in order to increase the search performance</param>
/// <param name="doSearchEverything">disregard the local sensitivity hashes and search the whole database</param>
/// <param name="splashScreen">The "please wait" splash screen (or null)</param>
/// <returns>a list of perceptually similar tracks</returns>
public List <FindSimilar.QueryResult> FindSimilarFromAudioSamplesList(
int lshHashTables,
int lshGroupsPerKey,
int thresholdTables,
WorkUnitParameterObject param,
bool optimizeSignatureCount,
bool doSearchEverything,
SplashSceenWaitingForm splashScreen)
{
DbgTimer t = new DbgTimer();
t.Start();
if (splashScreen != null)
{
splashScreen.SetProgress(2, "Creating fingerprints from audio samples ...");
}
// Get fingerprints
double[][] logSpectrogram;
List <bool[]> fingerprints = fingerprintService.CreateFingerprintsFromAudioSamples(param.AudioSamples, param, out logSpectrogram);
#if DEBUG
// Save debug images using fingerprinting methods
//Analyzer.SaveFingerprintingDebugImages(param.FileName, logSpectrogram, fingerprints, fingerprintService, param.FingerprintingConfiguration);
#endif
if (splashScreen != null)
{
splashScreen.SetProgress(3, String.Format("Successfully created {0} fingerprints.", fingerprints.Count));
}
// If the number of signatures is to big, only keep the first MAX_SIGNATURE_COUNT to avoid a very time consuming search
if (optimizeSignatureCount && fingerprints.Count > MAX_SIGNATURE_COUNT)
{
if (splashScreen != null)
{
splashScreen.SetProgress(4, String.Format("Only using the first {0} fingerprints out of {1}.", MAX_SIGNATURE_COUNT, fingerprints.Count));
}
fingerprints.RemoveRange(MAX_SIGNATURE_COUNT, fingerprints.Count - MAX_SIGNATURE_COUNT);
Dbg.WriteLine("Only using the first {0} fingerprints.", MAX_SIGNATURE_COUNT);
}
long elapsedMiliseconds = 0;
// Query the database using Min Hash
Dictionary <int, QueryStats> allCandidates = QueryFingerprintManager.QueryOneSongMinHash(
fingerprints,
dbService,
minHash,
lshHashTables,
lshGroupsPerKey,
thresholdTables,
ref elapsedMiliseconds,
doSearchEverything,
splashScreen);
if (splashScreen != null)
{
splashScreen.SetProgress(91, String.Format("Found {0} candidates.", allCandidates.Count));
}
IEnumerable <int> ids = allCandidates.Select(p => p.Key);
IList <Track> tracks = dbService.ReadTrackById(ids);
if (splashScreen != null)
{
splashScreen.SetProgress(95, String.Format("Reading {0} tracks.", tracks.Count));
}
// Order by Hamming Similarity
// TODO: What does the 0.4 number do here?
// there doesn't seem to be any change using another number?!
/*
* // Using PLINQ
* IOrderedEnumerable<KeyValuePair<int, QueryStats>> order = allCandidates
* .OrderBy((pair) => pair.Value.OrderingValue =
* pair.Value.HammingDistance / pair.Value.NumberOfTotalTableVotes
+ 0.4 * pair.Value.MinHammingDistance);
+
+
+ var fingerprintList = (from o in order
+ join track in tracks on o.Key equals track.Id
+ select new FindSimilar.QueryResult {
+ Id = track.Id,
+ Path = track.FilePath,
+ Duration = track.TrackLengthMs,
+ Similarity = o.Value.Similarity
+ }).ToList();
*/
// http://msdn.microsoft.com/en-us/library/dd460719(v=vs.110).aspx
// http://stackoverflow.com/questions/2767709/c-sharp-joins-where-with-linq-and-lambda
// Lambda query to order the candidates
var order = allCandidates.AsParallel()
.OrderBy((pair) => pair.Value.OrderingValue =
pair.Value.HammingDistance / pair.Value.NumberOfTotalTableVotes
+ 0.4 * pair.Value.MinHammingDistance)
.Take(200);
// TODO: Be able to create the above query as a LINQ query
// Join on the ID properties.
var fingerprintList = (from o in order.AsParallel()
join track in tracks.AsParallel() on o.Key equals track.Id
select new FindSimilar.QueryResult {
Id = track.Id,
Path = track.FilePath,
Duration = track.TrackLengthMs,
Similarity = o.Value.Similarity
})
.OrderByDescending((ord) => ord.Similarity)
.ToList();
if (splashScreen != null)
{
splashScreen.SetProgress(100, "Ready!");
}
Dbg.WriteLine("FindSimilarFromAudioSamplesList - Total Execution Time: {0} ms", t.Stop().TotalMilliseconds);
return(fingerprintList);
}