private async void FillSink()
{
var t = currentFillTask;
if (t != null)
{
await t;
}
lock (sink)
{
if (sink.IsFilled)
{
return;
}
}
currentFillTask = Task.Run(() =>
{
var buffer = source.Next(sink.Size);
lock (sink)
{
sink.Push(buffer, false);
}
currentFillTask = null;
});
}
public unsafe static Task WriteAsync(Stream stream, IAudioSource source, TimeSpan duration, int bufferSize = 44100)
{
const int headerSize = 44;
const int bitDepth = 16;
int dataSize = (int)(source.Format.SampleRate * source.Format.Channels * duration.TotalSeconds * (bitDepth / 8));
int totalSize = headerSize + dataSize;
return(Task.Run(() =>
{
using (var bw = new BinaryWriter(stream, Encoding.ASCII, true))
{
bw.Write(Encoding.ASCII.GetBytes("RIFF"));
bw.Write(totalSize - 8);
bw.Write(Encoding.ASCII.GetBytes("WAVE"));
bw.Write(Encoding.ASCII.GetBytes("fmt "));
bw.Write(16);
bw.Write((short)1);
bw.Write((short)source.Format.Channels);
bw.Write(source.Format.SampleRate);
bw.Write(source.Format.SampleRate * (bitDepth / 8) * source.Format.Channels);
bw.Write((short)(bitDepth / 8 * source.Format.Channels));
bw.Write((short)bitDepth);
// Data Chunk
bw.Write(Encoding.ASCII.GetBytes("data"));
bw.Write(dataSize);
int left = dataSize / (bitDepth / 8);
float[] buffer;
short[] writeBuffer = new short[bufferSize];
while (left > 0)
{
int write = Math.Min(left, bufferSize);
buffer = source.Next(write);
fixed(float *buf = buffer)
{
for (int i = 0; write > i; i++)
{
bw.Write((short)(buf[i] * short.MaxValue));
}
}
left -= write;
}
}
}));
}
