Adding the ability to add silence in the result set of fingerprints, …

…which may be useful for scenarios when the signal contains a lot of pauses that are considered as silence (podcasts).

src/SoundFingerprinting/Configuration/FingerprintConfiguration.cs

@@ -108,5 +108,15 @@ public FrequencyRange FrequencyRange
         ///  Frame normalization allows to apply
         /// </remarks>
         public IFrameNormalization FrameNormalizationTransform { get; set; } = null!;
+
+        /// <summary>
+        ///  Gets or sets a value indicating whether to include silence fingerprints into the fingerprinted result set.
+        /// </summary>
+        /// <remarks>
+        ///   Keep in mind that silence fingerprints will always cross-match with any other silence fingerprints. <br />
+        ///   May be useful in scenarios when the dataset is small, and the content you are fingerprinting contains a lot of speech. <br />
+        ///   Default value is false. <br/>
+        /// </remarks>
+        public bool TreatSilenceAsSignal { get; set; }
     }
 }

src/SoundFingerprinting/FingerprintService.cs

@@ -99,7 +99,7 @@ internal IEnumerable<Fingerprint> CreateOriginalFingerprintsFromFrames(IEnumerab
                     waveletDecomposition.DecomposeImageInPlace(rowCols, frame.Rows, frame.Cols, configuration.HaarWaveletNorm);
                     RangeUtils.PopulateIndexes(length, cachedIndexes);
                     var image = fingerprintDescriptor.ExtractTopWavelets(rowCols, configuration.TopWavelets, cachedIndexes);
-                    if (!image.IsSilence)
+                    if (!image.IsSilence || configuration.TreatSilenceAsSignal)
                     {
                         fingerprints.Add(new Fingerprint(image, frame.StartsAt, frame.SequenceNumber, originalPoint));
                     }