public RiffCodec Read(string filePath)
{
using var file = File.OpenRead(filePath);
var buffer = new byte[1024];
int read = file.Read(buffer, 0, 1024);
var readOnlySpan = new ReadOnlySpan <byte>(buffer);
var riff = new RiffCodec();
riff.Signature = Encoding.ASCII.GetString(readOnlySpan.Slice(0, 4));
EnforceCorrectMarker(riff.Signature, RIFF_SIGNATURE, nameof(riff.Signature));
riff.Filesize = BinaryPrimitives.ReadUInt32LittleEndian(readOnlySpan.Slice(4, 4));
riff.FormatHeaderType = Encoding.ASCII.GetString(readOnlySpan.Slice(8, 4));
riff.FormatChunkMarker = Encoding.ASCII.GetString(readOnlySpan.Slice(12, 4));
EnforceCorrectMarker(riff.FormatChunkMarker, MARKER_FMT, nameof(riff.FormatChunkMarker));
riff.FormatHeaderSize = BinaryPrimitives.ReadUInt32LittleEndian(readOnlySpan.Slice(16, 4));
riff.FormatHeader = ReadFormatHeader(readOnlySpan, riff.FormatHeaderType, riff.FormatHeaderSize);
riff.DataChunkMarker = Encoding.ASCII.GetString(readOnlySpan.Slice(20 + (int)riff.FormatHeaderSize, 4));
EnforceCorrectMarker(riff.DataChunkMarker, MARKER_DATA, nameof(riff.DataChunkMarker));
riff.DataSize = BinaryPrimitives.ReadUInt32LittleEndian(readOnlySpan.Slice(24 + (int)riff.FormatHeaderSize, 4));
riff.Data = new byte[riff.DataSize];
int currentPos = 28 + (int)riff.FormatHeaderSize;
Array.Copy(buffer, currentPos, riff.Data, 0, 1024 - currentPos);
bool finished = false;
currentPos = 1024 - currentPos;
do
{
read = file.Read(buffer, 0, 1024);
if (read > 0)
{
if ((currentPos + read) > riff.DataSize)
{
int amountToCopy = (int)riff.DataSize - currentPos;
Array.Copy(buffer, 0, riff.Data, currentPos, amountToCopy);
currentPos += amountToCopy;
//var ros = new ReadOnlySpan<byte>(buffer);
//Console.WriteLine($"Weird: {Encoding.ASCII.GetString(ros.Slice(amountToCopy, read - amountToCopy))}");
}
else
{
Array.Copy(buffer, 0, riff.Data, currentPos, read);
currentPos += read;
}
}
else
{
finished = true;
}
} while (!finished);
return(riff);
}
public async Task PlayWave(RiffCodec riff)
{
uint WAVE_MAPPER = uint.MaxValue;
int CALLBACK_NULL = 0;
IntPtr handle = IntPtr.Zero;
var header = riff.FormatHeader as WaveFormatHeader;
int duration = Convert.ToInt32(header.AvgBytesPerSec / header.SampleRate);
var waveFormat = new WAVEFORMAT
{
wFormatTag = header.FormatTag,
nChannels = header.ChannelsCount,
nSamplesPerSec = header.SampleRate,
nAvgBytesPerSec = header.AvgBytesPerSec,
nBlockAlign = header.BlockAlign,
wBitsPerSample = header.BitsPerSample,
cbSize = header.ExtraInfoSize
};
var waveHdr = new WAVEHDR
{
dwBufferLength = riff.DataSize,
dwBytesRecorded = riff.DataSize,
dwUser = 0,
dwFlags = 0,
dwLoops = 0
};
using var buffer = new UnamanagedMemory((int)riff.DataSize);
Marshal.Copy(riff.Data, 0, buffer.Pointer, riff.Data.Length);
waveHdr.lpData = buffer.Pointer;
uint res = uint.MaxValue;
res = WindowsMultimedia.waveOutOpen(ref handle, WAVE_MAPPER, ref waveFormat, 0, 0, CALLBACK_NULL);
CheckMethodResult(nameof(WindowsMultimedia.waveOutOpen), res);
res = WindowsMultimedia.waveOutPrepareHeader(handle, ref waveHdr, Marshal.SizeOf(waveHdr));
CheckMethodResult(nameof(WindowsMultimedia.waveOutPrepareHeader), res);
res = WindowsMultimedia.waveOutWrite(handle, ref waveHdr, Marshal.SizeOf(waveHdr));
CheckMethodResult(nameof(WindowsMultimedia.waveOutWrite), res);
await Task.Delay(duration * 1000);
res = WindowsMultimedia.waveOutClose(handle);
CheckMethodResult(nameof(WindowsMultimedia.waveOutClose), res);
}
