2.6.1.1 wfd_idr_request_capability
The wfd_idr_request_capability parameter specifies whether a Wi-Fi Display Sink supports sending an RTSP M13 message as specified in [WF-DTS2.1] section 6.4.13.
Since the purpose of the RTSP M13 message is to request that the Wi-Fi Display Source generate an instantaneous decoder refresh (IDR) picture, it might be useful for a Wi-Fi Display Source to determine a case where the Wi-Fi Display Sink never sends an RTSP M13 message.
A Wi-Fi Display Source that determines that it will never receive any RTSP M13 messages can insert instantaneous decoder refresh (IDR) pictures more frequently in the video bit stream, to compensate for the Wi-Fi Display Sink's inability to request such pictures.
The ABNF syntax is as follows:
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idr-request-capability = "wfd_idr_request_capability:" SP idr-req-cap-val CRLF idr-req-cap-val = "0" / "1"
If the idr-req-cap-val parameter has the value "1", it means that the Wi-Fi Display Sink is capable of sending RTSP M13 messages.
If the idr-req-cap-val parameter has the value "0", it means that the Wi-Fi Display Sink does not send any RTSP M13 messages.