Video output control method, video output control device and control circuit

Abstract

The invention provides a video output control method and a video output control device. The video output control method comprises the following steps that: a safety controller detects whether the output resolution configured in a video display controller and the HDCP encryption state configured in a HDMI interface satisfy the HDCP protection requirement of a video or not in real time; and, if the output resolution configured in the video display controller and the HDCP encryption state configured in the HDMI interface do not satisfy the HDCP protection requirement of the video, the safety controller sends an instruction to the video display controller, such that the video display controller is indicated to close output of the video. From the foregoing, when the output resolution configured in the video display controller and the HDCP encryption state configured in the HDMI interface do not satisfy the HDCP protection requirement of the video, it shows that the output resolution of the video display controller or the HDCP encryption state of the HDMI interface is tampered due to the fact that a video driving module in a rich execution environment REE is attacked; the video output at this time is unsafe; the safety controller sends the instruction to the video display controller, such that the video display controller is indicated to close output of the video; and thus, the video output safety is ensured.

Description

technical field [0001] The invention relates to video output, in particular to a method for controlling video output, a device thereof, and a control circuit. Background technique [0002] With the evolution of video codec technology and people's constant pursuit of higher-quality visual images, 4K Ultra High Definition (UHD) resolution video has gradually entered the public's field of vision and has been rapidly promoted. Due to the high cost of high-quality video production, copyright protection has formed an industry consensus and has been continuously strengthened. In the UHD era, organizations represented by MovieLabs have formulated corresponding security specifications. Among them, high-bandwidth digital content protection technology (High Bandwidth Digital Content Protection Technology (High -bandwidthDigitalContentProtection, HDCP) protection and special emphasis on the security and robustness of the video playback operating environment. [0003] The GlobalPlatform...

AI Technical Summary

Problems solved by technology

[0012] In the above-mentioned prior art, after the HDCP encryption state of the HDMI interface of the set-top box and the output resolution of the video display controller are configured by the video driver module, since the video driver module is located in the REE environment, the video driver module is easy to Under attack, the HDCP encryption status of the HDMI interface of the set-top box or the configuration of the output resolution of the video display controller is tampered with, so that the security of the video output controlled by the video display controller cannot be guaranteed

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