static void ClassifyAndDump(short[] signal, SignalClassifier classifier, string folder, string fileName)
{
var result = classifier.Classify(signal).Select(ConvertClassMark).ToArray();
var dump = new WavFileInfo(DefaultSampleRate, result);
var filePath = string.Concat(folder, fileName, "_result", ".wav");
dump.Write(filePath);
}
private static void ClassifyAll(string folder, string[] fileNames, SignalClassifier classifier)
{
foreach (var fileName in fileNames)
{
var wavFile = WavFileInfo.Read(string.Concat(folder, fileName, ".wav"));
if (wavFile.SampleRate != DefaultSampleRate)
{
throw new Exception(string.Format("File {0} has non-default sample rate", fileName));
}
ClassifyAndDump(wavFile.Data, classifier, folder, fileName);
var markerFile = MarkerFileInfo.Read(string.Concat(folder, fileName, ".mrk"));
var expectedWavFile = new WavFileInfo(wavFile.SampleRate,
markerFile.Decompress(wavFile.Data.Length)
.Select(ConvertClassMark)
.ToArray());
expectedWavFile.Write(string.Concat(folder, fileName, "_expected", ".wav"));
}
}
public static WavFileInfo Read(string filePath)
{
var ret = new WavFileInfo();
using (var reader = new BinaryReader(new FileStream(filePath, FileMode.Open)))
{
// The "RIFF" chunk descriptor
ret.ChunkDescriptor = ReadString(reader, 4);
ret.ChunkSize = reader.ReadInt32();
ret.Format = ReadString(reader, 4);
if (ret.ChunkDescriptor != "RIFF" || ret.Format != "WAVE")
{
throw new Exception("File must have WAVE format.");
}
// The "FMT" sub-chunk
ret.Subchunk1Id = ReadString(reader, 4);
ret.Subchunk1Size = reader.ReadInt32();
ret.AudioFormat = reader.ReadInt16();
ret.NumChannels = reader.ReadInt16();
ret.SampleRate = reader.ReadInt32();
ret.ByteRate = reader.ReadInt32();
ret.BlockAlign = reader.ReadInt16();
ret.BitsPerSample = reader.ReadInt16();
if (ret.AudioFormat != 1)
{
throw new Exception("File must have WAVE PCM audio format.");
}
if (ret.BitsPerSample != 16)
{
throw new Exception("Must be 2 bytes per each sample in WAV file.");
}
if (ret.NumChannels != 1)
{
throw new Exception("Must one channel in WAV file. Sorry, only mono!");
}
// The "data" sub-chunk
ret.Subchunk2Id = ReadString(reader, 4);
ret.Subchunk2Size = reader.ReadInt32();
var dataLength = ret.Subchunk2Size / sizeof(short);
ret.Data = new short[dataLength];
for (var i = 0; i < dataLength; i++)
ret.Data[i] = reader.ReadInt16();
}
return ret;
}
static void ExtractAndDump(short[] signal, IFeatureExtractor featureExtractor, string folder, string fileName)
{
var feature = featureExtractor.Extract(signal);
var dump = new WavFileInfo(DefaultSampleRate, feature);
var filePath = string.Concat(folder, fileName, featureExtractor.FeatureName, ".wav");
dump.Write(filePath);
}
