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26 changes: 26 additions & 0 deletions
26
src/SoundFingerprinting.Tests/Unit/Utils/SilenceCalculatorTest.cs
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,26 @@ | ||
| namespace SoundFingerprinting.Tests.Unit.Utils; | ||
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| using System.Linq; | ||
| using NUnit.Framework; | ||
| using SoundFingerprinting.Data; | ||
| using SoundFingerprinting.Utils; | ||
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| [TestFixture] | ||
| public class SilenceCalculatorTest | ||
| { | ||
| [Test] | ||
| public void ShouldCalculateCorrectly() | ||
| { | ||
| var hashedFingerprints = Enumerable.Range(0, 10).Select(index => | ||
| { | ||
| int[] hashBins = index % 2 == 0 ? Enumerable.Repeat(-1, 25).ToArray() : Enumerable.Repeat(1, 25).ToArray(); | ||
| return new HashedFingerprint(hashBins, (uint)index, (float)index / 2, []); | ||
| }).ToArray(); | ||
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| var hashes = new Hashes(hashedFingerprints, 10, MediaType.Audio); | ||
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| var timespan = SilenceCalculator.Calculate(hashes); | ||
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| Assert.That(timespan.TotalSeconds, Is.EqualTo(2.5).Within(0.1)); | ||
| } | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,63 @@ | ||
| namespace SoundFingerprinting.Utils; | ||
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| using System; | ||
| using System.Linq; | ||
| using SoundFingerprinting.Data; | ||
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| /// <summary> | ||
| /// Silence calculator. | ||
| /// </summary> | ||
| /// <remarks> | ||
| /// A utility class allowing to calculate silence contained within audio and video hashes. <br /> | ||
| /// It only makes sense to calculate silence for hashes if TreatAsSilence flag is set to true during fingerprinting. <br /> | ||
| /// Do not set the flag to true unless you've explicitly arrived to the conclusion you need it. | ||
| /// </remarks> | ||
| public static class SilenceCalculator | ||
| { | ||
| /// <summary> | ||
| /// Silence value, derived from the fact that an array of [255, 255, 255, 255] min hashes will map to -1 during hashes conversion. | ||
| /// </summary> | ||
| private const int Silence = -1; | ||
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| /// <summary> | ||
| /// Calculate silence contained within audio and video hashes. | ||
| /// </summary> | ||
| /// <param name="avHashes">AVHashes to analyze.</param> | ||
| /// <returns> | ||
| /// Tuple containing audio and video silence. For video hashes silence means black frames. | ||
| /// </returns> | ||
| public static (TimeSpan, TimeSpan) Calculate(AVHashes avHashes) | ||
| { | ||
| var audioSilence = Calculate(avHashes.Audio); | ||
| var videoSilence = Calculate(avHashes.Video); | ||
| return (audioSilence, videoSilence); | ||
| } | ||
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| /// <summary> | ||
| /// Calculate contained silence within hashes. | ||
| /// </summary> | ||
| /// <param name="hashes">Hashes to analyze.</param> | ||
| /// <returns>Timespan.</returns> | ||
| /// <remarks> | ||
| /// It only makes sense to calculate silence for hashes if TreatAsSilence flag is set to true during fingerprinting. | ||
| /// </remarks> | ||
| public static TimeSpan Calculate(Hashes? hashes) | ||
| { | ||
| if (hashes == null || hashes.IsEmpty) | ||
| { | ||
| return TimeSpan.Zero; | ||
| } | ||
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| var items = hashes.OrderBy(_ => _.SequenceNumber).ToArray(); | ||
| double silence = 0; | ||
| for (int i = 1; i < items.Length; i++) | ||
| { | ||
| if (hashes[i - 1].HashBins.All(_ => _ == Silence)) | ||
| { | ||
| silence += items[i].StartsAt - items[i - 1].StartsAt; | ||
| } | ||
| } | ||
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| return TimeSpan.FromSeconds(silence); | ||
| } | ||
| } |