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.
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// Sound Fingerprinting framework
// git://github.com/AddictedCS/soundfingerprinting.git
// Code license: CPOL v.1.02
// ciumac.sergiu@gmail.com
using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.IO;
using System.Threading;
using System.Windows.Forms;
using Soundfingerprinting.AudioProxies;
using Soundfingerprinting.SoundTools.Properties;
using Un4seen.Bass.AddOn.Tags;
namespace Soundfingerprinting.SoundTools.FFMpegResampler
{
public partial class WinFfMpegResampler : Form
{
private readonly List<string> _fileList = new List<string>();
private int _bitRate;
private int _currentProceesedFiles;
private string _outputPath;
private bool _pause;
private string _rootPath;
private int _samplingRate;
private int _skipped;
private bool _stopped;
public WinFfMpegResampler()
{
InitializeComponent();
Icon = Resources.Sound;
_currentProceesedFiles = 0;
_skipped = 0;
}
private void button1_Click(object sender, EventArgs e)
{
if (folderBrowserDialog1.ShowDialog() == DialogResult.OK)
{
_rootPath = folderBrowserDialog1.SelectedPath;
textBox1.Text = _rootPath;
_fileList.Clear();
foreach (string f in Directory.GetFiles(_rootPath, "*.mp3"))
{
_fileList.Add(f);
}
foreach (string f in Directory.GetFiles(_rootPath, "*.flac"))
{
_fileList.Add(f);
}
DirSearch(_rootPath);
textBox2.Text = _fileList.Count.ToString();
labelTotalFiles.Text = textBox2.Text;
_skipped = 0;
_currentProceesedFiles = 0;
labelSkipped.Text = _skipped.ToString();
labelCurrentProcessed.Text = _currentProceesedFiles.ToString();
}
}
private void buttonOutputBrowse_Click(object sender, EventArgs e)
{
if (folderBrowserDialog2.ShowDialog() == DialogResult.OK)
{
_outputPath = folderBrowserDialog2.SelectedPath;
textBox3.Text = _outputPath;
buttonStartConversion.Enabled = true;
}
}
private void DirSearch(string sDir)
{
try
{
foreach (string d in Directory.GetDirectories(sDir))
{
foreach (string f in Directory.GetFiles(d, "*.mp3"))
{
_fileList.Add(f);
}
foreach (string f in Directory.GetFiles(d, "*.flac"))
{
_fileList.Add(f);
}
DirSearch(d);
}
}
catch (Exception excpt)
{
Console.WriteLine(excpt.Message);
}
}
private void buttonRefresh_Click(object sender, EventArgs e)
{
_fileList.Clear();
_rootPath = textBox1.Text;
foreach (string f in Directory.GetFiles(_rootPath, "*.mp3"))
{
_fileList.Add(f);
}
foreach (string f in Directory.GetFiles(_rootPath, "*.flac"))
{
_fileList.Add(f);
}
DirSearch(_rootPath);
textBox2.Text = _fileList.Count.ToString();
labelTotalFiles.Text = textBox2.Text;
buttonStartConversion.Enabled = true;
buttonStop.Enabled = false;
_currentProceesedFiles = 0;
_skipped = 0;
labelSkipped.Text = _skipped.ToString();
labelCurrentProcessed.Text = _currentProceesedFiles.ToString();
}
private void ProcessFiles()
{
Action finishDel = delegate
{
buttonStop.Enabled = false;
buttonPause.Enabled = false;
buttonStartConversion.Enabled = true;
_stopped = false;
};
Process process = new Process
{
StartInfo =
{
FileName = "ffmpeg.exe",
CreateNoWindow = true,
WindowStyle = ProcessWindowStyle.Hidden,
RedirectStandardInput = true,
RedirectStandardError = true,
RedirectStandardOutput = true,
UseShellExecute = false
}
};
Action del = delegate
{
labelCurrentProcessed.Text = _currentProceesedFiles.ToString();
labelSkipped.Text = _skipped.ToString();
richTextBox1.AppendText(process.StandardError.ReadToEnd() + "\n");
richTextBox1.Focus();
richTextBox1.SelectionStart = richTextBox1.Text.Length;
};
using (BassProxy proxy = new BassProxy())
{
foreach (string f in _fileList)
{
if (_stopped)
{
Invoke(finishDel);
Thread.CurrentThread.Abort();
}
while (_pause)
{
if (_stopped)
{
Invoke(finishDel);
Thread.CurrentThread.Abort();
}
Thread.Sleep(1000);
}
TAG_INFO tags = null;
try
{
//Read Tags from the file
tags = proxy.GetTagInfoFromFile(f);
}
catch
{
_skipped++;
_currentProceesedFiles++;
Invoke(del);
continue;
}
//Compose the output name of the wav file
if (String.IsNullOrEmpty(tags.title) || tags.title.Length == 0)
{
//Skip file
_skipped++;
_currentProceesedFiles++;
Invoke(del);
continue;
}
string artist = "";
if (String.IsNullOrEmpty(tags.artist))
{
if (tags.composer == null)
{
_skipped++;
_currentProceesedFiles++;
Invoke(del);
continue;
}
artist = tags.composer;
}
else
artist = tags.artist;
string outfilename = tags.title + " + " + artist + ".wav";
string outfile = _outputPath + "\\" + outfilename;
string arguments = "-i \"" + f + "\" -ac 1 -ar " + _samplingRate + " -ab " +
_bitRate + " \"" + outfile + "\"";
process.StartInfo.Arguments = arguments;
process.Start();
process.StandardInput.Write("n");
_currentProceesedFiles++;
Invoke(del);
}
}
Invoke(finishDel);
}
private void ButtonStartConversionClick(object sender, EventArgs e)
{
if (!Int32.TryParse(textBoxSamplingRate.Text, out _samplingRate))
_samplingRate = 5512;
if (!Int32.TryParse(textBoxBitRate.Text, out _bitRate))
_bitRate = 64000;
Thread thread = new Thread(ProcessFiles);
thread.Start();
_currentProceesedFiles = 0;
labelCurrentProcessed.Text = _currentProceesedFiles.ToString();
buttonPause.Enabled = true;
buttonStartConversion.Enabled = false;
buttonStop.Enabled = true;
}
private void buttonPause_Click(object sender, EventArgs e)
{
_pause = !_pause;
}
private void buttonStop_Click(object sender, EventArgs e)
{
_stopped = true;
buttonStop.Enabled = false;
}
}
}
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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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