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How to correctly identify video data frame encryption in hdcp video data on hdmi

A video data, correct technology, applied in the direction of digital video signal modification, pulse modulation TV signal transmission, selective content distribution, etc., can solve the problem of no implementation

Active Publication Date: 2019-10-29
SYNOPSYS INC
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Problems solved by technology

Since transmitting color depth information to downstream devices is optional, it is not implemented in all devices

Method used

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  • How to correctly identify video data frame encryption in hdcp video data on hdmi

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Embodiment Construction

[0014] In one embodiment, clock cycles are counted starting at the rising edge of VSYNC, and the correct color depth can be determined by looking at the 4'h9 signal in the control bus. The system can adaptively sync to WOO based on two windowing schemes (24-bit based WOO and color depth based WOO, depending on which WOO is used).

[0015] refer to figure 1 , as an example, a four-pixel pipeline may be used to establish color depth. VSYNC pulses are received by the Finite State Machine (FSM) when observing the Content Encryption Engine (CEE) pre-authorization and authorization (pre-AUTH and AUTH) modes (as defined in the HDCP standard) and reset the counter. The FSM detects the 4'h9 signal in the TMDS control bus during one of four consecutive WOOs. Determine the position of the 4'h9 control signal in the TMDS control (CTRL) word and infer the color depth (CD) based on Table 2.

[0016] 4'h9 position in TMDS CTRL word color depth 512 24 640 30 768 ...

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Abstract

A method for determining the color depths of the video data for a selected frame in High- bandwidth Digital Content Protection (HDCP) video data transmitted over a High Definition Multimedia Interface (HDMI), in which (a) the beginning of the selected frame is marked with a vertical synchronization (VSYNC) signal and (b) a mark in a window of opportunity (WOO) for the selected frame indicates whether or not that frame is encrypted. The method detects, for the selected frame, the length of the interval between a VSYNC signal and the location of at least one of (i) the start of the corresponding WOO and (ii) the mark indicating whether or not the selected frame is encrypted, and then determines the color depth of the video data for the selected frame based on the detected length.

Description

technical field [0001] The present invention relates to the field of High-bandwidth Digital Content Protection (HDCP) over a High Definition Multimedia Interface (HDMI). Background technique [0002] HDMI standardizes the transmission of color depth information during the initialization of the transmission (at preset time). Use color depth to describe the number of bits used in a single pixel to make a color. The more bits per pixel, the better the transition from one color to another and the more detailed the different shades of a particular color next to each other. Since the transmission of color depth information to downstream devices is optional, it is not implemented in all devices. [0003] High Definition Multimedia Interface (HDMI) supports video data with four different color depths defined in multiple frames, namely 24-bit, 30-bit, 36-bit and 48-bit. The beginning of a frame is marked with a vertical synchronization (VSYNC) signal. Video frame data is represen...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N21/254H04N19/186H04N7/56
CPCH04N21/43635H04N21/4367
Inventor A.A.·吉特拉·阿迪卡里安德鲁·亚历山大·埃利亚斯尼尔·莱克艾特
Owner SYNOPSYS INC
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