static IntPtr ReadAudio(int sampleNums, IntPtr numSamplesPointer)
{
context.Send((_) =>
{
if (sampleNums <= 0)
{
numSamplesToCopy = 0;
return;
}
// 前回の録音位置から今回の録音位置までを返す
var currentReadPos = Microphone.GetPosition("");
if (previousReadPos < currentReadPos) // 巻き戻りが起きていない
{
var sampleRected = (currentReadPos - previousReadPos);
numSamplesToCopy = Math.Min(sampleRected, sampleNums);
CopySamplesFromClipToSharedBuffer(numSamplesToCopy);
}
else if (currentReadPos < previousReadPos) // 巻き戻りが起きている
{
var sampleRected = ((clip.samples - previousReadPos) + currentReadPos);
numSamplesToCopy = Math.Min(sampleRected, sampleNums);
CopySamplesFromClipToSharedBuffer(numSamplesToCopy);
}
else
{
numSamplesToCopy = 0;
}
previousReadPos = currentReadPos;
}, null);
Marshal.WriteInt32(numSamplesPointer, numSamplesToCopy);
return(sharedBuffer);
}
