![]() The Miracast user-mode driver calls the ReportStatistic callback function to report details with the MIRACAST_STATISTIC_TYPE_CHUNK_PROCESSING_COMPLETE type, or with MIRACAST_STATISTIC_TYPE_CHUNK_SENT to indicate the chunk is about to be sent to the network stack for transmission.This info is nevertheless important for measuring and investigating performance issues.Ī driver can provide the notification using one of the following possible ways: ![]() The operating system takes no action other than to log these events using the Event Tracing for Windows (ETW) kernel-level tracing facility. The time of a particular reported processing step is assumed to be the time the event was reported to the operating system, so it's important to report the stages as rapidly as possible. Immediately before each part of the frame is sent to the network.The hardware has completed a processing step for a frame.Each processing step should be assigned a unique frame part number within the frame.Įither the Miracast user-mode driver or the display miniport driver must notify the operating system each time that: Reporting chunk processingĪ driver can encode a frame to be sent over a Miracast wireless link either in multiple processing steps-for example separating color conversion from encoding-or in a single step. ![]() Each chunk that's related to the same desktop frame update must be assigned the same frame number. Each chunk has a unique chunk ID that's generated from the frame number and the frame part (or slice) number. On Windows 8.1, display hardware can process each video frame sent over a Miracast wireless display link by splitting the frame into multiple parts, or encode chunks. Microsoft might remove support for custom Miracast stacks in a future version of Windows. The relevant WHLK documentation at .WirelessDisplayĭriver developers should no longer implement a custom Miracast stack. For information about the Microsoft Miracast stack and the requirements of drivers and hardware to support Miracast displays starting in Windows 10, see the following documentation:īuilding best-in-class Wireless projection solutions with Windows 10 Starting in Windows 10 (WDDM 2.0), the operating system ships with a built-in Miracast stack that can work on any GPU.
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