Video processing circuit and related method for merging video output streams with graphical stream for transmission

摘要

A video processing circuit includes a video generating unit for generating a video output stream, a graphic generating unit for providing a graphical stream, and a communication interface circuit. The communication interface circuit has a first mode provided for mixing the video output stream and the graphical stream to transmit a mixed video output stream through a channel and a second mode provided for merging the video output stream and the graphical stream to transmit a first merged signal through the channel. In the second mode, the communication interface circuit merges the video output stream and the graphical stream by increasing a working frequency of the communication interface circuit to increase bandwidths of the channel, using positions for transmitting a portion of video control signals in the video output stream to transmit the graphical stream, and compressing the video output stream.

主权项

1. A video processing circuit, comprising:
a video generating unit for generating a video output stream according to a video input stream; a graphic generating unit for providing a graphical stream; and a communication interface circuit, coupled to the video generating unit and the graphic generating unit, the communication interface circuit having a first mode provided for mixing the video output stream and the graphical stream to transmit a mixed video output stream through a channel, and a second mode provided for merging the video output stream and the graphical stream to transmit a first merged signal through the channel, wherein in the first mode, bandwidth of the channel is used for transmitting the mixed video output stream, and in the second mode, a first part of bandwidth of the channel is utilized for transmitting the video output stream and a second part of bandwidth of the channel is utilized for transmitting the graphical stream; wherein in the second mode, the communication interface circuit merges the video output stream and the graphical stream by compressing the video output stream.