The IOCTL_BTHHFP_STREAM_OPEN IOCTL requests an open synchronous connection-oriented (SCO) channel to transmit audio data over the air.
Input buffer length
Output buffer length
A STATUS_DEVICE_BUSY message to indicate that the stream channel is already open.
This request can remain pending for several seconds while resources are established.
While the stream channel is open the target driver attempts to keep the SCO channel open for audio data transfer. However the SCO channel might close briefly, if the remote device disconnects the SCO channel. The target driver will attempt to reopen the SCO channel in this case, without requiring any action from the client audio driver.
|Minimum supported client||Windows 8|
|Minimum supported server||Windows Server 2012|