public void OnBufferNotification(object sender, BufferNotificationEventArgs e)
{
if (e.NewSoundByte == null || e.NewSoundByte.Length != e.NumBytesRequired)
{
e.NewSoundByte = new byte[e.NumBytesRequired];
}
int bytesRead = Stream.Read(e.NewSoundByte, 0, e.NumBytesRequired);
if (bytesRead != e.NumBytesRequired)
{
byte[] trimmedBytes = new byte[bytesRead];
Array.Copy(e.NewSoundByte, trimmedBytes, bytesRead);
e.NewSoundByte = trimmedBytes;
}
e.SoundFinished = Stream.Length == Stream.Position;
if (BufferNotification != null)
{
BufferNotification(sender, e);
}
}
/// <summary>
/// The stream control thread raises events every half the stream.
/// When the BufferNotificationEventArgs contains a SoundFinished property set to true, the
/// current buffer segment is padded with silence. At the next notification, the next
/// buffer segment is filled with silence, and no event is raised.
/// At the next notification, which will come when the padded segment
/// (not the completely silent segment) is finished, the SecondaryBuffer is stopped and
/// the thread terminated.
/// </summary>
private void StreamControlThread()
{
int nextPlaceForBytes = 0;
int wholeBufferSize = SB.Caps.BufferBytes;
int byteWindowSize = wholeBufferSize / 2;
NextNotificationTask task = NextNotificationTask.FillSectionWithNewSound;
//BufferNotificationEventArgs ssea = new BufferNotificationEventArgs(SB.Caps.BufferBytes);
BufferNotificationEventArgs firstNotificationEventArgs = new BufferNotificationEventArgs(wholeBufferSize);
GetBytesByRaisingEvent(0, wholeBufferSize, firstNotificationEventArgs);
task = HandleNewBytesInControlThread(nextPlaceForBytes, wholeBufferSize, firstNotificationEventArgs);
bool terminate = false;
while (!terminate)
{
NotificationEvent.Reset();
NotificationEvent.WaitOne();
if (SB.Disposed || (!Playing))
{
break;
}
/// Very strange behavior from DirectSound!!
/// SB.PlayPosition returns a value slightly less than the actual position. Either that or the event is raised
/// So you can use that to determine which section to fill. Fill the half that you're currently "playing"
/// according to the PlayPosition.
/// If anyone knows how to do this properly, please e-mail me, [email protected].
int playPosition = SB.PlayPosition;
int distToBegin = Math.Abs(playPosition - 0);
int distToEnd = Math.Abs(playPosition - wholeBufferSize);
int distToMid = Math.Abs(playPosition - byteWindowSize);
if (distToMid < distToEnd && distToMid < distToBegin)
{
nextPlaceForBytes = 0;
}
else
{
nextPlaceForBytes = byteWindowSize;
}
//Console.WriteLine(DateTime.Now + ": Received request for bytes at " + nextPlaceForBytes + " and I'm now at " + SB.PlayPosition);
switch (task)
{
case NextNotificationTask.FillSectionWithNewSound:
BufferNotificationEventArgs nextNotificationEventArgs = new BufferNotificationEventArgs(byteWindowSize);
GetBytesByRaisingEvent(nextPlaceForBytes, byteWindowSize, nextNotificationEventArgs);
task = HandleNewBytesInControlThread(nextPlaceForBytes, byteWindowSize, nextNotificationEventArgs);
break;
case NextNotificationTask.FillSectionWithSilence:
task = NextNotificationTask.StopSecondaryBufferAndThread;
//Console.WriteLine("Filling section with silence at " + nextPlaceForBytes);
int currentPosition = 0; int writePos = 0;
SB.GetCurrentPosition(out currentPosition, out writePos);
//Console.WriteLine("Current pos " + currentPosition + " and writing " + byteWindowSize + " at " + nextPlaceForBytes);
SB.Write(nextPlaceForBytes, new byte[byteWindowSize], LockFlag.None);
break;
default: // NextNotificationTask.StopSecondaryBufferAndThread
SB.Stop();
//Console.WriteLine("stream control thread dies.");
return;
}
//nextPlaceForBytes += byteWindowSize; if (nextPlaceForBytes >= SB.Caps.BufferBytes) nextPlaceForBytes = 0;
}
//Console.WriteLine("stream control thread dies.");
}
private NextNotificationTask HandleNewBytesInControlThread(int nextPlaceForBytes, int byteWindowSize, BufferNotificationEventArgs ea)
{
LockFlag lockFlag = LockFlag.None;
int bytesObtained = ea.NewSoundByte.Length;
if (bytesObtained > byteWindowSize)
{
SB.Stop();
throw new ApplicationException("An event handler provided the streaming buffer with " + bytesObtained + " bytes of sound, but it only requested " + byteWindowSize + " bytes.");
}
else if (bytesObtained == byteWindowSize)
{
SB.Write(nextPlaceForBytes, ea.NewSoundByte, lockFlag);
}
else
{
// Fill the remainder of the segment with silence.
if (ea.NewSoundByte.Length > 0)
{
SB.Write(nextPlaceForBytes, ea.NewSoundByte, lockFlag);
}
SB.Write(nextPlaceForBytes + ea.NewSoundByte.Length, new byte[byteWindowSize - ea.NewSoundByte.Length], lockFlag);
if (ea.SoundFinished)
{
return(NextNotificationTask.FillSectionWithSilence);
}
}
return(NextNotificationTask.FillSectionWithNewSound);
}
private void GetBytesByRaisingEvent(int locationInSecondaryBuffer, int numBytesToAcquire, BufferNotificationEventArgs e)
{
e.NumBytesRequiredRep = numBytesToAcquire;
if (BufferNotification != null)
{
BufferNotification(this, e);
}
if (e.NewSoundByte == null)
{
e.NewSoundByte = new byte[0];
}
//Console.WriteLine("Request issued for " + numBytesToAcquire + " bytes; " + e.NewSoundByte.Length + " obtained.");
}
public void OnBufferNotification(object sender, BufferNotificationEventArgs e)
{
if (e.NewSoundByte == null || e.NewSoundByte.Length != e.NumBytesRequired)
e.NewSoundByte = new byte[e.NumBytesRequired];
int bytesRead = Stream.Read(e.NewSoundByte, 0, e.NumBytesRequired);
if (bytesRead != e.NumBytesRequired)
{
byte[] trimmedBytes = new byte[bytesRead];
Array.Copy(e.NewSoundByte, trimmedBytes, bytesRead);
e.NewSoundByte = trimmedBytes;
}
e.SoundFinished = Stream.Length == Stream.Position;
if (BufferNotification != null) BufferNotification(sender, e);
}
/// <summary>
/// The stream control thread raises events every half the stream.
/// When the BufferNotificationEventArgs contains a SoundFinished property set to true, the
/// current buffer segment is padded with silence. At the next notification, the next
/// buffer segment is filled with silence, and no event is raised.
/// At the next notification, which will come when the padded segment
/// (not the completely silent segment) is finished, the SecondaryBuffer is stopped and
/// the thread terminated.
/// </summary>
private void StreamControlThread()
{
int nextPlaceForBytes = 0;
int wholeBufferSize = SB.Caps.BufferBytes;
int byteWindowSize = wholeBufferSize / 2;
NextNotificationTask task = NextNotificationTask.FillSectionWithNewSound;
//BufferNotificationEventArgs ssea = new BufferNotificationEventArgs(SB.Caps.BufferBytes);
BufferNotificationEventArgs firstNotificationEventArgs = new BufferNotificationEventArgs(wholeBufferSize);
GetBytesByRaisingEvent(0, wholeBufferSize, firstNotificationEventArgs);
task = HandleNewBytesInControlThread(nextPlaceForBytes, wholeBufferSize, firstNotificationEventArgs);
bool terminate = false;
while (!terminate)
{
NotificationEvent.Reset();
NotificationEvent.WaitOne();
if (SB.Disposed || (!Playing)) break;
/// Very strange behavior from DirectSound!!
/// SB.PlayPosition returns a value slightly less than the actual position. Either that or the event is raised
/// So you can use that to determine which section to fill. Fill the half that you're currently "playing"
/// according to the PlayPosition.
/// If anyone knows how to do this properly, please e-mail me, [email protected].
int playPosition = SB.PlayPosition;
int distToBegin = Math.Abs(playPosition - 0);
int distToEnd = Math.Abs(playPosition - wholeBufferSize);
int distToMid = Math.Abs(playPosition - byteWindowSize);
if (distToMid < distToEnd && distToMid < distToBegin)
nextPlaceForBytes = 0;
else
nextPlaceForBytes = byteWindowSize;
//Console.WriteLine(DateTime.Now + ": Received request for bytes at " + nextPlaceForBytes + " and I'm now at " + SB.PlayPosition);
switch(task)
{
case NextNotificationTask.FillSectionWithNewSound:
BufferNotificationEventArgs nextNotificationEventArgs = new BufferNotificationEventArgs(byteWindowSize);
GetBytesByRaisingEvent(nextPlaceForBytes, byteWindowSize, nextNotificationEventArgs);
task = HandleNewBytesInControlThread(nextPlaceForBytes, byteWindowSize, nextNotificationEventArgs);
break;
case NextNotificationTask.FillSectionWithSilence:
task = NextNotificationTask.StopSecondaryBufferAndThread;
//Console.WriteLine("Filling section with silence at " + nextPlaceForBytes);
int currentPosition = 0; int writePos = 0;
SB.GetCurrentPosition(out currentPosition, out writePos);
//Console.WriteLine("Current pos " + currentPosition + " and writing " + byteWindowSize + " at " + nextPlaceForBytes);
SB.Write(nextPlaceForBytes, new byte[byteWindowSize], LockFlag.None);
break;
default: // NextNotificationTask.StopSecondaryBufferAndThread
SB.Stop();
//Console.WriteLine("stream control thread dies.");
return;
}
//nextPlaceForBytes += byteWindowSize; if (nextPlaceForBytes >= SB.Caps.BufferBytes) nextPlaceForBytes = 0;
}
//Console.WriteLine("stream control thread dies.");
}
private NextNotificationTask HandleNewBytesInControlThread(int nextPlaceForBytes, int byteWindowSize, BufferNotificationEventArgs ea)
{
LockFlag lockFlag = LockFlag.None;
int bytesObtained = ea.NewSoundByte.Length;
if (bytesObtained > byteWindowSize)
{
SB.Stop();
throw new ApplicationException("An event handler provided the streaming buffer with " + bytesObtained + " bytes of sound, but it only requested " + byteWindowSize + " bytes.");
}
else if (bytesObtained == byteWindowSize)
{
SB.Write(nextPlaceForBytes, ea.NewSoundByte, lockFlag);
}
else
{
// Fill the remainder of the segment with silence.
if (ea.NewSoundByte.Length > 0) SB.Write(nextPlaceForBytes, ea.NewSoundByte, lockFlag);
SB.Write(nextPlaceForBytes+ea.NewSoundByte.Length, new byte[byteWindowSize-ea.NewSoundByte.Length], lockFlag);
if (ea.SoundFinished) return NextNotificationTask.FillSectionWithSilence;
}
return NextNotificationTask.FillSectionWithNewSound;
}
private void GetBytesByRaisingEvent(int locationInSecondaryBuffer, int numBytesToAcquire, BufferNotificationEventArgs e)
{
e.NumBytesRequiredRep = numBytesToAcquire;
if (BufferNotification != null) BufferNotification(this, e);
if (e.NewSoundByte == null) e.NewSoundByte = new byte[0];
//Console.WriteLine("Request issued for " + numBytesToAcquire + " bytes; " + e.NewSoundByte.Length + " obtained.");
}
