private (byte[] FormatChunk, RangeHelper.Range DataChunk) ReadChunkRanges(FixtureModel model)
{
using var stream = model.ToTargetInformation(this.RealFileSystem).FileStream;
var riffChunk = Wave.FindRiffChunk(stream);
var waveChunk = riffChunk.Bind(r => Wave.FindWaveChunk(stream, r));
var formatChunk = waveChunk.Bind(w => Wave.FindFormatChunk(stream, w));
var dataChunk = waveChunk.Bind(w => Wave.FindDataChunk(stream, w));
var formatSpan = RangeHelper.ReadRange(stream, (RangeHelper.Range)formatChunk);
return(formatSpan.ToArray(), (RangeHelper.Range)dataChunk);
}
public ValueTask <Recording> ProcessFileAsync(TargetInformation information, Recording recording)
{
var stream = information.FileStream;
var riffChunk = Wave.FindRiffChunk(stream);
var waveChunk = riffChunk.Bind(r => Wave.FindWaveChunk(stream, r));
var formatChunk = waveChunk.Bind(w => Wave.FindFormatChunk(stream, w));
var dataChunk = waveChunk.Bind(w => Wave.FindDataChunk(stream, w));
if (formatChunk.IsFail)
{
this.logger.LogError("Failed to process wave file: {error}", formatChunk);
return(new ValueTask <Recording>(recording));
}
var formatSpan = RangeHelper.ReadRange(stream, (RangeHelper.Range)formatChunk);
var sampleRate = Wave.GetSampleRate(formatSpan);
var bitsPerSample = Wave.GetBitsPerSample(formatSpan);
var byteRate = Wave.GetByteRate(formatSpan);
var channels = Wave.GetChannels(formatSpan);
var samples = dataChunk.Map(d => (ulong?)Wave.GetTotalSamples(d, channels, bitsPerSample));
var fileLength = stream.Length;
// TODO: replace with rational type from master branch
var duration = samples.Map(s => (Rational?)new Rational((uint)samples !, (uint)sampleRate));
return(ValueTask.FromResult(recording with
{
DurationSeconds = duration.IfFail((Rational?)null),
TotalSamples = samples.IfFail((ulong?)null),
SampleRateHertz = sampleRate,
Channels = (ushort)channels,
BitsPerSecond = byteRate * BinaryHelpers.BitsPerByte,
BitDepth = (byte)bitsPerSample,
FileLengthBytes = (ulong)fileLength,
}));
}