User input back channel for wireless displays

摘要

As part of a communication session, a wireless source device can transmit audio and video data to a wireless sink device, and the wireless sink device can transmit user inputs received at the wireless sink device back to the wireless source device. In this manner, a user of the wireless sink device can control the wireless source device and control the content that is being transmitted from the wireless source device to the wireless sink device. As part of transmitting user input to the source device, the sink device can generate a data packet that identifies a user input category for the user input, and the source device can process the data packet based on the user input category.

主权项

1. A method of transmitting user input data from a wireless sink device to a wireless source device, the method comprising:
performing capability negotiation to determine one or more categories of user input supported by the wireless source device, wherein performing the capability negotiation comprises:
transmitting, by the wireless sink device and to the wireless source device a real-time streaming protocol (RTSP) message that indicates a first set of one or more categories of user input supported by the sink device;receiving, by the wireless sink device and from the wireless source device, an RTSP message that indicates a second set of one or more user input categories supported by the sink device and with which the wireless source device is compatible; andtransmitting, by the wireless sink device and to the wireless source device, a message confirming one of the second set of supported user input categories is enabled; after performing the capability negotiation, obtaining user input data at the wireless sink device; generating a data packet header, wherein the data packet header comprises a field to identify the enabled input category of the user input data; generating a data packet comprising the data packet header and payload data, wherein the enabled input category identifies how the payload data is formatted; and transmitting the data packet to the wireless source device.