Ports default to enabled and are enabled/disabled by OMX_CommandPortEnable/OMX_CommandPortDisable. When disabled a port is unpopulated. A disabled port is not populated with buffers on a transition to IDLE.

Port is populated with all of its buffers as indicated by nBufferCountActual. A disabled port is always unpopulated. An enabled port is populated on a transition to OMX_StateIdle and unpopulated on a transition to loaded.

Direction (input or output) of this port

Domain of the port. Determines the contents of metadata below.

The actual number of buffers allocated on this port

The minimum number of buffers this port requires

Size, in bytes, for buffers to be used for this channel

Port number the structure applies to

Size of the structure in bytes

OMX specification version information