public ProcessedMetaData ReadHeader(BinaryReader reader)
{
//Read the wave file header from the buffer.
int headerSize = 0;
int optionalSize = 0;
int normalSize = 44;
int chunkID = reader.ReadInt32();
int fileSize = reader.ReadInt32();
int riffType = reader.ReadInt32();
int fmtID = reader.ReadInt32();
int fmtSize = reader.ReadInt32();
int fmtCode = reader.ReadInt16();
int channels = reader.ReadInt16();
int sampleRate = reader.ReadInt32();
int fmtAvgBPS = reader.ReadInt32();
int fmtBlockAlign = reader.ReadInt16();
int bitDepth = reader.ReadInt16();
if (fmtSize == 18)
{
// Read any extra values
int fmtExtraSize = reader.ReadInt16();
reader.ReadBytes(fmtExtraSize);
optionalSize = fmtExtraSize + 2;
}
int dataID = reader.ReadInt32();
int dataSize = reader.ReadInt32();
headerSize = normalSize + optionalSize;
ProcessedMetaData metaData = new ProcessedMetaData(channels, bitDepth, sampleRate, headerSize);
return(metaData);
}
/// <summary>
/// Main method for processing the whole music sample
/// </summary>
/// <param name="inputFilePath"></param>
/// <param name="outputFileName"></param>
/// <param name="form"></param>
public void ProcessSoundFile(string inputFilePath, string outputFileName, SoundVisualizer form)
{
if (form.filesToProcess != null)
{
Monitor.Exit(form.filesToProcess);
}
#region processing header
BinaryReader headerStream = new BinaryReader(File.Open(inputFilePath, FileMode.Open));
ISoundReader soundReader = new WavSoundReader();
ProcessedMetaData metaData = soundReader.ReadHeader(headerStream);
SampleSize = metaData.channelsCount * metaData.bitDepth / 8;
sampleArraySize = (ChunkSize / SampleSize) + 1;
headerStream.Close();
#endregion
#region skipping header
FileStream dataStream = new FileStream(inputFilePath, FileMode.Open, FileAccess.Read);
dataStream.Seek(metaData.headerSize, SeekOrigin.Begin);
#endregion
#region processing data
Complex[] complexSamples = new Complex[sampleArraySize];
Complex[] extendedComplexSamples = new Complex[2 * sampleArraySize - 2];
IWindowFunction window = new HannWindowFunction();
byte[] byteValues = soundReader.ReadDataBuffer(dataStream, ChunkSize + SampleSize);
MusicSample musicSample = new MusicSample(metaData, inputFilePath);
musicSample.Notes = new List <Note>();
while (dataStream.Position < dataStream.Length - ChunkSize)
{
complexSamples = ToComplexSamples(metaData.channelsCount == 1 ? byteValues : ExtractByteChannel(byteValues, isEven: true), metaData.bitDepth, metaData.channelsCount);
INoiseDetector noiseDetector = new RMSNoiseDetector(2 << (metaData.bitDepth - 1));
if (noiseDetector.IsNoise(complexSamples))
{
Note detectedNote = new Pause();
musicSample.Notes.Add(detectedNote);
}
else
{
extendedComplexSamples = ExtendSamples(complexSamples);
window.Windowify(extendedComplexSamples);
extendedComplexSamples = extendedComplexSamples.MakeFFT().MakeHPS(HPSIterationsCount);
MaxFreqBin maxFreqBin = GetMaxFreqBin(extendedComplexSamples);
double maxFreq = CalculateMaxFreq(maxFreqBin.BinNumber, metaData, sampleArraySize);
NoteDetector noteDetector = new NoteDetector();
Note detectedNote = noteDetector.GetClosestNote(maxFreq / 2);
musicSample.Notes.Add(detectedNote);
}
soundReader.MoveDataBuffer(dataStream, window.OverlapSize, byteValues);
}
IErrorCorrector corrector = new OverlapWindowCorrector();
corrector.Correct(musicSample);
INoteLengthProcessor noteLengthProcessor = new DefaultNoteLengthProcessor();
noteLengthProcessor.ProcessSample(musicSample);
StreamWriter writer2 = new StreamWriter(outputFileName);
INoteWriter noteWriter = new LillyPondNoteWriter();
noteWriter.WriteAll(musicSample, writer2);
#endregion
}
private double CalculateMaxFreq(int maxAmplitudeIndex, ProcessedMetaData metaData, int samplesCount)
{
return(((double)maxAmplitudeIndex * metaData.sampleFreq / samplesCount));
}
public MusicSample(ProcessedMetaData metaData, string sourceName)
{
this.metaData = metaData;
this.sourceName = sourceName;
}