2.2.5.4.2 Notify Preroll Message (NOTIFY_PREROLL)
The NOTIFY_PREROLL message is sent from the server to the client to indicate that a stream is preloading the media data before playback.
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Header (variable) |
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PresentationId (16 bytes) |
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StreamId |
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Header (variable): The common message header (as specified in section 2.2.1). The InterfaceId field MUST be set to 0x00000000. The Mask field MUST be set to STREAM_ID_PROXY. The FunctionId field MUST be set to NOTIFY_PREROLL (0x00000113).
PresentationId (16 bytes): A 16-byte GUID that identifies the presentation.
StreamId (4 bytes): A 32-bit unsigned integer that identifies the stream ID.