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Initial commit. That was a fun challenge!

master
Starbeamrainbowlabs 5 years ago
commit
37f310a1b1
  1. 434
      .gitignore
  2. 17
      MorseCodeParser.sln
  3. 201
      MorseCodeParser/AudioMorseDecoder.cs
  4. 49
      MorseCodeParser/MorseCodeParser.csproj
  5. 102
      MorseCodeParser/MorseDecoder.cs
  6. 19
      MorseCodeParser/Program.cs
  7. 26
      MorseCodeParser/Properties/AssemblyInfo.cs
  8. 4
      MorseCodeParser/packages.config

434
.gitignore

@ -0,0 +1,434 @@
# Created by https://www.gitignore.io/api/visualstudio,monodevelop,csharp
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# but keep track of directories ending in .cache
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17
MorseCodeParser.sln

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Microsoft Visual Studio Solution File, Format Version 12.00
# Visual Studio 2012
Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "MorseCodeParser", "MorseCodeParser\MorseCodeParser.csproj", "{431E17FD-CF16-4B9E-B282-D71CFD2B3AE6}"
EndProject
Global
GlobalSection(SolutionConfigurationPlatforms) = preSolution
Debug|x86 = Debug|x86
Release|x86 = Release|x86
EndGlobalSection
GlobalSection(ProjectConfigurationPlatforms) = postSolution
{431E17FD-CF16-4B9E-B282-D71CFD2B3AE6}.Debug|x86.ActiveCfg = Debug|x86
{431E17FD-CF16-4B9E-B282-D71CFD2B3AE6}.Debug|x86.Build.0 = Debug|x86
{431E17FD-CF16-4B9E-B282-D71CFD2B3AE6}.Release|x86.ActiveCfg = Release|x86
{431E17FD-CF16-4B9E-B282-D71CFD2B3AE6}.Release|x86.Build.0 = Release|x86
EndGlobalSection
EndGlobal

201
MorseCodeParser/AudioMorseDecoder.cs

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using System;
using System.Linq;
using System.Collections.Generic;
using NAudio.Wave;
using Cairo;
namespace MorseCodeParser
{
enum MorseTokenType
{
ToneStart,
ToneEnd
}
struct MorseToken
{
public MorseTokenType Type;
public int Index;
public MorseToken(MorseTokenType inType, int inIndex)
{
Type = inType;
Index = inIndex;
}
public override string ToString()
{
return string.Format("[MorseToken {0}\tat {1}]", Type, Index);
}
}
class MorseTone
{
public int Index;
public int Length;
public MorseTone(int inIndex, int inLength)
{
Index = inIndex;
Length = inLength;
}
public override string ToString()
{
return string.Format("[MorseTone at {0} of length {1}]", Index, Length);
}
}
public class AudioMorseDecoder
{
private string filename;
private ISampleProvider samples;
private readonly int floatBufferSize = 220500 * 4;
private readonly int windowSize = 100;
private readonly int stepSize = 25;
private readonly float threshold = 0.8f;
public AudioMorseDecoder(string inFilename)
{
filename = inFilename;
AudioFileReader reader = new AudioFileReader(filename);
samples = reader.ToSampleProvider();
}
private List<MorseToken> analyzeSamples()
{
List<MorseToken> result = new List<MorseToken>();
int buffersRead = 0;
float[] rawBuffer = new float[floatBufferSize];
float[] windowedBuffer = new float[(floatBufferSize - windowSize) / stepSize];
int samplesRead;
while(true)
{
samplesRead = samples.Read(rawBuffer, 0, floatBufferSize);
for(int i = 0, s = 0; i < samplesRead - windowSize; i += stepSize, s++)
windowedBuffer[s] = rawBuffer.Skip(i).Take(windowSize).Max();
for(int i = 1; i < windowedBuffer.Length; i++)
{
if(windowedBuffer[i - 1] < threshold && windowedBuffer[i] >= threshold)
result.Add(new MorseToken(MorseTokenType.ToneStart, (buffersRead * windowedBuffer.Length) + i));
else if(windowedBuffer[i - 1] > threshold && windowedBuffer[i] <= threshold)
result.Add(new MorseToken(MorseTokenType.ToneEnd, (buffersRead * windowedBuffer.Length) + i));
}
if(samplesRead < floatBufferSize)
break;
buffersRead++;
}
return result;
}
public List<string> ExtractWords(bool renderImage = false)
{
List<MorseToken> tokens = analyzeSamples();
if(renderImage)
drawFingerprint(tokens);
List<MorseTone> tones = new List<MorseTone>();
for(int i = 0; i < tokens.Count; i += 2)
tones.Add(new MorseTone(tokens[i].Index, tokens[i + 1].Index - tokens[i].Index));
int longestToneLength = tones.Max((MorseTone tone) => tone.Length);
int shortestToneLength = tones.Min((MorseTone tone) => tone.Length);
int shortestTonePause = tones.Zip(tones.Skip(1), (a, b) => Tuple.Create(a, b))
.Min((Tuple<MorseTone, MorseTone> tonePair) =>
tonePair.Item2.Index - (tonePair.Item1.Index + tonePair.Item1.Length)
);
int longestTonePause = tones.Zip(tones.Skip(1), (a, b) => Tuple.Create(a, b))
.Max((Tuple<MorseTone, MorseTone> tonePair) =>
tonePair.Item2.Index - (tonePair.Item1.Index + tonePair.Item1.Length)
);
int mediumTonePause = shortestTonePause * 3;
List<string> resultWords = new List<string>();
string currentWord = "";
for(int i = 0; i < tones.Count; i++)
{
if(i > 0)
{
int toneSpacing = tones[i].Index - (tones[i - 1].Index + tones[i - 1].Length);
int distanceToShortestGap = Math.Abs(shortestTonePause - toneSpacing);
int distanceToMediumGap = Math.Abs(mediumTonePause - toneSpacing);
int distanceToLongestGap = Math.Abs(longestTonePause - toneSpacing);
if(distanceToMediumGap < distanceToLongestGap && distanceToMediumGap < distanceToShortestGap)
{
// It's a letter spacing!
currentWord += " ";
}
if(distanceToLongestGap < distanceToMediumGap && distanceToLongestGap < distanceToShortestGap)
{
// It's a word spacing!
resultWords.Add(currentWord);
currentWord = string.Empty;
}
}
if(Math.Abs(longestToneLength - tones[i].Length) < Math.Abs(shortestToneLength - tones[i].Length))
{
// It's a long tone
currentWord += "-";
}
else
{
// It's a short tone
currentWord += ".";
}
}
// Add the last word decoded to the list
resultWords.Add(currentWord);
return resultWords;
}
private void drawFingerprint(List<MorseToken> tokens)
{
int fingerprintWidth = 1200, fingerprintHeight = 100;
float scaleFactorX = (float)fingerprintWidth / tokens.Last().Index;
using(ImageSurface image = new ImageSurface(Format.Argb32, fingerprintWidth, fingerprintHeight))
using(Context context = new Context(image))
{
context.Antialias = Antialias.Subpixel;
context.SetSourceColor(new Color(1, 0.4901, 0.1019, 0.8));
for(int i = 0; i < tokens.Count; i += 2)
{
MorseToken startToken = tokens[i];
MorseToken endToken = tokens[i + 1];
context.NewPath();
Rectangle tokenArea = new Rectangle(
startToken.Index * scaleFactorX,
0,
(endToken.Index - startToken.Index) * scaleFactorX,
fingerprintHeight
);
context.Rectangle(tokenArea);
context.Fill();
}
image.WriteToPng("fingerprint.png");
}
}
}
}

49
MorseCodeParser/MorseCodeParser.csproj

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<?xml version="1.0" encoding="utf-8"?>
<Project DefaultTargets="Build" ToolsVersion="4.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
<PropertyGroup>
<Configuration Condition=" '$(Configuration)' == '' ">Debug</Configuration>
<Platform Condition=" '$(Platform)' == '' ">x86</Platform>
<ProjectGuid>{431E17FD-CF16-4B9E-B282-D71CFD2B3AE6}</ProjectGuid>
<OutputType>Exe</OutputType>
<RootNamespace>MorseCodeParser</RootNamespace>
<AssemblyName>MorseCodeParser</AssemblyName>
<TargetFrameworkVersion>v4.6.1</TargetFrameworkVersion>
</PropertyGroup>
<PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|x86' ">
<DebugSymbols>true</DebugSymbols>
<DebugType>full</DebugType>
<Optimize>false</Optimize>
<OutputPath>bin\Debug</OutputPath>
<DefineConstants>DEBUG;</DefineConstants>
<ErrorReport>prompt</ErrorReport>
<WarningLevel>4</WarningLevel>
<ExternalConsole>true</ExternalConsole>
<PlatformTarget>x86</PlatformTarget>
</PropertyGroup>
<PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Release|x86' ">
<Optimize>true</Optimize>
<OutputPath>bin\Release</OutputPath>
<ErrorReport>prompt</ErrorReport>
<WarningLevel>4</WarningLevel>
<ExternalConsole>true</ExternalConsole>
<PlatformTarget>x86</PlatformTarget>
</PropertyGroup>
<PropertyGroup Condition=" '$(RunConfiguration)' == 'Default' ">
<StartAction>Project</StartAction>
<StartArguments>"/home/sbrl/Music/Morse Code 2.wav"</StartArguments>
</PropertyGroup>
<ItemGroup>
<Reference Include="System" />
<Reference Include="NAudio">
<HintPath>..\packages\NAudio.1.8.0\lib\net35\NAudio.dll</HintPath>
</Reference>
<Reference Include="Mono.Cairo" />
</ItemGroup>
<ItemGroup>
<Compile Include="Program.cs" />
<Compile Include="Properties\AssemblyInfo.cs" />
<Compile Include="MorseDecoder.cs" />
<Compile Include="AudioMorseDecoder.cs" />
</ItemGroup>
<Import Project="$(MSBuildBinPath)\Microsoft.CSharp.targets" />
</Project>

102
MorseCodeParser/MorseDecoder.cs

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using System;
using System.Collections.Generic;
namespace SBRL.Algorithms.MorseCodeTranslator
{
/// <summary>
/// A simple class to translate a morse code string into a normal string.
/// </summary>
/// <license>Mozilla Public License version 2.0</license>
/// <origin></origin>
/// <author>Starbeamrainbowlabs (https://starbeamrainbowlabs.com/)</author>
/// <changelog>
/// v0.1 - 26th May 2017:
/// - Creation! 😁
/// </changelog>
public static class MorseDecoder
{
/// <summary>
/// The morse code lookup table. Use the methods in this class is possible,
/// rather than accessing this lookup table directly!
/// </summary>
public static Dictionary<string, char> morseCodeLookup = new Dictionary<string, char>()
{
[".-"] = 'a',
["-..."] = 'b',
["-.-."] = 'c',
["-.."] = 'd',
["."] = 'e',
["..-."] = 'f',
["--."] = 'g',
["...."] = 'h',
[".."] = 'i',
[".---"] = 'j',
["-.-"] = 'k',
[".-.."] = 'l',
["--"] = 'm',
["-."] = 'n',
["---"] = 'o',
[".--."] = 'p',
["--.-"] = 'q',
[".-."] = 'r',
["..."] = 's',
["-"] = 't',
["..-"] = 'u',
["...-"] = 'v',
[".--"] = 'w',
["-..-"] = 'x',
["-.--"] = 'y',
["--.."] = 'z',
[".----"] = '1',
["..---"] = '2',
["...--"] = '3',
["....-"] = '4',
["....."] = '5',
["-...."] = '6',
["--..."] = '7',
["---.."] = '8',
["----."] = '9',
["-----"] = '0',
};
/// <summary>
/// Translates a single letter from morse code.
/// </summary>
/// <param name="morseSource">The morse code to translate.</param>
/// <returns>The translated letter.</returns>
public static char TranslateLetter(string morseSource)
{
return morseCodeLookup[morseSource.Trim()];
}
/// <summary>
/// Translates a string of space-separated morse code strings from morse code.
/// </summary>
/// <param name="morseSource">The morse code to translate.</param>
/// <returns>The translated word.</returns>
public static string TranslateWord(string morseSource)
{
string result = string.Empty;
string[] morseLetters = morseSource.Split(" ".ToCharArray());
foreach(string morseLetter in morseLetters)
result += TranslateLetter(morseLetter);
return result;
}
/// <summary>
/// Translates a list of morse-encoded words.
/// </summary>
/// <param name="morseSources">The morse-encoded words to decipher.</param>
/// <returns>The decoded text.</returns>
public static string TranslateText(IEnumerable<string> morseSources)
{
string result = string.Empty;
foreach(string morseSource in morseSources)
result += $"{TranslateWord(morseSource)} ";
return result.Trim();
}
}
}

19
MorseCodeParser/Program.cs

@ -0,0 +1,19 @@
using System;
using System.Collections.Generic;
using SBRL.Algorithms.MorseCodeTranslator;
namespace MorseCodeParser
{
class MainClass
{
public static void Main(string[] args)
{
AudioMorseDecoder decoder = new AudioMorseDecoder(args[0]);
List<string> morseWords = decoder.ExtractWords(true);
Console.WriteLine("Decoded morse code:");
Console.WriteLine(string.Join("\n", morseWords));
Console.WriteLine("Deciphered text: {0}", MorseDecoder.TranslateText(morseWords));
}
}
}

26
MorseCodeParser/Properties/AssemblyInfo.cs

@ -0,0 +1,26 @@
using System.Reflection;
using System.Runtime.CompilerServices;
// Information about this assembly is defined by the following attributes.
// Change them to the values specific to your project.
[assembly: AssemblyTitle("MorseCodeParser")]
[assembly: AssemblyDescription("")]
[assembly: AssemblyConfiguration("")]
[assembly: AssemblyCompany("")]
[assembly: AssemblyProduct("")]
[assembly: AssemblyCopyright("")]
[assembly: AssemblyTrademark("")]
[assembly: AssemblyCulture("")]
// The assembly version has the format "{Major}.{Minor}.{Build}.{Revision}".
// The form "{Major}.{Minor}.*" will automatically update the build and revision,
// and "{Major}.{Minor}.{Build}.*" will update just the revision.
[assembly: AssemblyVersion("1.0.*")]
// The following attributes are used to specify the signing key for the assembly,
// if desired. See the Mono documentation for more information about signing.
//[assembly: AssemblyDelaySign(false)]
//[assembly: AssemblyKeyFile("")]

4
MorseCodeParser/packages.config

@ -0,0 +1,4 @@
<?xml version="1.0" encoding="utf-8"?>
<packages>
<package id="NAudio" version="1.8.0" targetFramework="net45" />
</packages>
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