/// <summary>
/// Run feature extract on the given mkcollection.
/// </summary>
/// <param name="mkcollection">Path to mkcollection of songs to run feature extraction on</param>
/// <returns>Path to .arff file that contains the features for the given mkcollection</returns>
public static string featureExtraction(string mkcollection)
{
string arffFilename = "out.arff";
//Run bextract with following parameters:
// -fe : for feature extraction only
// -n : for normalization
// -ws : setting window size to 45s
// -hp : setting hopsize to match window size
// -od : ouput directory to temporary dir
// -w : output arff file
string bextractArgs = "-fe -n -ws " + WINDOW_FS + " -hp " + WINDOW_FS + " -od " + ExecutableInformation.getTmpPath() + "/" + " -w " + arffFilename + " " + mkcollection;
System.Diagnostics.Process bextract = new System.Diagnostics.Process();
bextract.StartInfo.WindowStyle = System.Diagnostics.ProcessWindowStyle.Hidden; //Hide the window
bextract.StartInfo.UseShellExecute = false;
bextract.StartInfo.RedirectStandardOutput = false;
bextract.StartInfo.Arguments = bextractArgs;
bextract.StartInfo.FileName = ExecutableInformation.getBExtractPath();
bextract.Start();
bextract.WaitForExit();
return(Path.Combine(ExecutableInformation.getTmpPath(), arffFilename));
}
/// <summary>
/// Write a list of file paths to mkcollection file in the temp directory.
/// </summary>
/// <param name="filePaths">List of paths to be included in the mkcolection file.</param>
/// <returns>Path to output mkcollection</returns>
public static string convertToMkcollection(string[] filePaths)
{
string mkcollectionFile = Path.Combine(ExecutableInformation.getTmpPath(), "music.mk");
File.WriteAllLines(mkcollectionFile, filePaths);
return(mkcollectionFile);
}
/// <summary>
/// Returns a list of fully qualified paths to the converted audio files
/// </summary>
/// <param name="files">list of .mp3 files</param>
/// <returns>List of .wav files</returns>
public static string[] ffmpegConversion(string[] files)
{
//bextract requires .wav files, but user will give .mp3 files.
//ffmpeg will make temporary .wav files.
string[] tempfiles = new string[files.Length];
int i = 0;
foreach (string file in files)
{
//First create temporary file
string newfile = ExecutableInformation.getTmpPath() + "/" + Path.GetFileNameWithoutExtension(file);
while (files.Contains(newfile + ".wav"))
{
newfile += "_dup";
}
newfile += ".wav";
tempfiles[i] = Path.GetFullPath(newfile);
//Run FFMPEG
string ffmpegArgs = "-loglevel quiet -y -i " + file + " " + newfile;
System.Diagnostics.Process ffmpeg = new System.Diagnostics.Process();
ffmpeg.StartInfo.WindowStyle = System.Diagnostics.ProcessWindowStyle.Hidden;
ffmpeg.StartInfo.UseShellExecute = false;
ffmpeg.StartInfo.RedirectStandardOutput = true; // Redirect so we can read the standard output
ffmpeg.StartInfo.Arguments = ffmpegArgs;
ffmpeg.StartInfo.FileName = ExecutableInformation.getFFMPegPath();
ffmpeg.Start();
ffmpeg.WaitForExit();
}
return(tempfiles);
}
