private bool FeedBuffer(AudioRenderClient renderClient, byte[] buffer, int numFramesCount, int frameSize)
{
//calculate the number of bytes to "feed"
int count = numFramesCount * frameSize;
count -= (count % _source.WaveFormat.BlockAlign);
//if the driver did not request enough data, return true to continue playback
if (count <= 0)
return true;
//get the requested data
int read = _source.Read(buffer, 0, count);
//if the source did not provide enough data, we abort the playback by returning false
if (read <= 0)
return false;
//calculate the number of FRAMES to request
int actualNumFramesCount = read / frameSize;
//again there are some special requirements for exclusive mode AND eventsync
if (_shareMode == AudioClientShareMode.Exclusive && _eventSync &&
read < count)
{
/* The caller can request a packet size that is less than or equal to the amount
* of available space in the buffer (except in the case of an exclusive-mode stream
* that uses event-driven buffering; for more information, see IAudioClient::Initialize).
* see https://msdn.microsoft.com/en-us/library/windows/desktop/dd368243%28v=vs.85%29.aspx - remarks*/
//since we have to provide exactly the requested number of frames, we clear the rest of the array
Array.Clear(buffer, read, count - read);
//set the number of frames to request memory for, to the number of requested frames
actualNumFramesCount = numFramesCount;
}
IntPtr ptr = renderClient.GetBuffer(actualNumFramesCount);
//we may should introduce a try-finally statement here, but the Marshal.Copy method should not
//throw any relevant exceptions ... so we should be able to always release the packet
Marshal.Copy(buffer, 0, ptr, read);
renderClient.ReleaseBuffer(actualNumFramesCount, AudioClientBufferFlags.None);
return true;
}
private bool FeedBuffer(AudioRenderClient renderClient, byte[] buffer, int numFramesCount, int frameSize)
{
int count = numFramesCount * frameSize;
count -= (count % _source.WaveFormat.BlockAlign);
if (count <= 0)
return true;
int read = _source.Read(buffer, 0, count);
var ptr = renderClient.GetBuffer(numFramesCount);
Marshal.Copy(buffer, 0, ptr, read);
renderClient.ReleaseBuffer((int)(read / frameSize), AudioClientBufferFlags.None);
return read > 0;
}