/// <summary>
/// Using audio's voice to generate replay frames
/// Logic is copied from <see cref="Waveform"/>
/// </summary>
/// <param name="beatmap"></param>
/// <param name="data"></param>
public KaraokeAutoGeneratorBySinger(KaraokeBeatmap beatmap, Stream data)
: base(beatmap)
{
if (data == null)
{
return;
}
readTask = Task.Run(() =>
{
int decodeStream = 0;
using (var fileCallbacks = new FileCallbacks(new DataStreamFileProcedures(data)))
{
decodeStream = Bass.CreateStream(StreamSystem.NoBuffer, BassFlags.Decode | BassFlags.Float, fileCallbacks.Callbacks, fileCallbacks.Handle);
}
Bass.ChannelGetInfo(decodeStream, out ChannelInfo info);
var totalLength = Bass.ChannelGetLength(decodeStream);
double trackLength = Bass.ChannelBytes2Seconds(decodeStream, totalLength) * 1000;
var length = totalLength;
long lengthSum = 0;
// Microphone at period 10
var bytesPerIteration = 3276 * info.Channels * TrackBass.BYTES_PER_SAMPLE;
var pitches = new Dictionary <double, float?>();
var sampleBuffer = new float[bytesPerIteration / TrackBass.BYTES_PER_SAMPLE];
// Read sample data
while (length > 0)
{
length = Bass.ChannelGetData(decodeStream, sampleBuffer, bytesPerIteration);
lengthSum += length;
// usually sample 1 is vocal
var channel0Sample = sampleBuffer.Where((x, i) => i % 2 == 0).ToArray();
//var channel1Sample = sampleBuffer.Where((x, i) => i % 2 != 0).ToArray();
// Convert buffer to pitch data
var time = lengthSum * trackLength / totalLength;
var pitch = Pitch.FromYin(channel0Sample, info.Frequency, low: 40, high: 1000);
pitches.Add(time, pitch == 0 ? default(float?) : pitch);
}
return(pitches);
}, cancelSource.Token);
}
