streaming-states.md

title	description	keywords	ms.date
Streaming States	Streaming States	video capture WDK AVStream , stream states capturing video WDK AVStream , stream states stream states WDK video capture states WDK video capture STOP state WDK video capture ACQUIRE state WDK video capture PAUSE state WDK video capture RUN state WDK video capture	04/20/2017

Streaming States

Each stream provided by the minidriver exists in one of four states: KSSTATE_STOP, KSSTATE_ACQUIRE, KSSTATE_PAUSE, or KSSTATE_RUN. Upon initialization, the stream is, by default, in the KSSTATE_STOP state. Transitions to the other states are made when the Stream class interface sends an SRB_SET_STREAM_STATE request to the minidriver. The following table identifies and describes the four stream states.

State	Description
KSSTATE_STOP	When the stream state is stopped, the minidriver uses the absolute minimum of resources, and there are no outstanding data SRBs in the minidriver's queue.
KSSTATE_ACQUIRE	When the stream state is acquiring resources, the minidriver allocates all needed resources, such as bandwidth on USB and IEEE 1394.
KSSTATE_PAUSE	When the stream state is paused, the minidriver is prepared to instantly make a transition to KSSTATE_RUN.
KSSTATE_RUN	When the stream state is streaming, the minidriver fills buffers and completes SRBs using CompleteStreamSRB.