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Duplicate songs detector via audio fingerprinting

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23 Jun 2020MIT44 min read 1.3M   20.4K   533  
Explains sound fingerprinting algorithm, with a practical example of detecting duplicate files on the user's local drive.
The aim of this article is to show an efficient algorithm of signal processing which will allow one to have a competent system of sound fingerprinting and signal recognition. I'll try to come with some explanations of the article's algorithm, and also speak about how it can be implemented using the C# programming language. Additionally, I'll try to cover topics of digital signal processing that are used in the algorithm, thus you'll be able to get a clearer image of the entire system. And as a proof of concept, I'll show you how to develop a simple WPF MVVM application.
// Sound Fingerprinting framework
// git://github.com/AddictedCS/soundfingerprinting.git
// Code license: CPOL v.1.02
// ciumac.sergiu@gmail.com
using System;

namespace Soundfingerprinting.AudioProxies.Strides
{
    /// <summary>
    ///   Random stride object. [min - max Samples stride]
    /// </summary>
    [Serializable]
    public class RandomStride : IStride
    {
        private static readonly Random Random = new Random(unchecked((int) DateTime.Now.Ticks));
        private readonly int _firstStride;

        /// <summary>
        ///   Max stride
        /// </summary>
        private readonly int _maxStride;

        /// <summary>
        ///   Min stride
        /// </summary>
        private readonly int _minStride;

        /// <summary>
        ///   Constructor for a random stride object
        /// </summary>
        /// <param name = "minStrideSize">Minimum stride size, generated by this object</param>
        /// <param name = "maxStrideSize">Maximum stride size, generated by this object</param>
        public RandomStride(int minStrideSize, int maxStrideSize)
        {
            if (minStrideSize < 0 || maxStrideSize < 0 || minStrideSize > maxStrideSize)
                throw new ArgumentException("Bad arguments. Please review the documentation");
            _minStride = minStrideSize;
            _maxStride = maxStrideSize;
            _firstStride = 0;
        }

        /// <summary>
        ///   Min stride size
        /// </summary>
        public int Min
        {
            get { return _minStride; }
        }

        /// <summary>
        ///   Max stride size
        /// </summary>
        public int Max
        {
            get { return _maxStride; }
        }

        #region IStride Members

        /// <summary>
        ///   Get's stride size in terms of number of samples, which are needed to be skipped
        /// </summary>
        /// <returns>Bit samples to skip, between 2 consecutive overlapping fingerprints</returns>
        public int GetStride()
        {
            return Random.Next(_minStride, _maxStride);
        }

        public int GetFirstStride()
        {
            return _firstStride;
        }

        #endregion
    }
}

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This article, along with any associated source code and files, is licensed under The MIT License


Written By
Software Developer
Moldova (Republic of) Moldova (Republic of)
Interested in computer science, math, research, and everything that relates to innovation. Fan of agnostic programming, don't mind developing under any platform/framework if it explores interesting topics. In search of a better programming paradigm.

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