CN113259709A - Frame sequence embedding and identifying method for improving security of broadcast television broadcasting system - Google Patents
Frame sequence embedding and identifying method for improving security of broadcast television broadcasting system Download PDFInfo
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- CN113259709A CN113259709A CN202110498886.7A CN202110498886A CN113259709A CN 113259709 A CN113259709 A CN 113259709A CN 202110498886 A CN202110498886 A CN 202110498886A CN 113259709 A CN113259709 A CN 113259709A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
- H04N21/23—Processing of content or additional data; Elementary server operations; Server middleware
- H04N21/233—Processing of audio elementary streams
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
- H04N21/23—Processing of content or additional data; Elementary server operations; Server middleware
- H04N21/235—Processing of additional data, e.g. scrambling of additional data or processing content descriptors
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
- H04N21/23—Processing of content or additional data; Elementary server operations; Server middleware
- H04N21/235—Processing of additional data, e.g. scrambling of additional data or processing content descriptors
- H04N21/2351—Processing of additional data, e.g. scrambling of additional data or processing content descriptors involving encryption of additional data
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
- H04N21/23—Processing of content or additional data; Elementary server operations; Server middleware
- H04N21/242—Synchronization processes, e.g. processing of PCR [Program Clock References]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
- H04N21/439—Processing of audio elementary streams
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
- H04N21/439—Processing of audio elementary streams
- H04N21/4394—Processing of audio elementary streams involving operations for analysing the audio stream, e.g. detecting features or characteristics in audio streams
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/80—Generation or processing of content or additional data by content creator independently of the distribution process; Content per se
- H04N21/85—Assembly of content; Generation of multimedia applications
- H04N21/854—Content authoring
- H04N21/8547—Content authoring involving timestamps for synchronizing content
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- Computer Security & Cryptography (AREA)
- Theoretical Computer Science (AREA)
- Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)
Abstract
The invention discloses a frame sequence embedding and identifying method for improving the safety of a broadcast television broadcasting system, which comprises the steps that in the transmission of digital video and audio signals, unique frame sequence information is embedded in an information layer of each frame, and the embedded frame sequence information in each frame is different; receiving the digital video and audio signals embedded with the frame sequence information, decoding and analyzing the frame sequence information, and selecting to switch output signals according to the analysis result; if the signal is not abnormal, outputting a main path signal; if the signal is abnormal, the backup path signal is output in a switching way. The frame sequence embedding and identifying method for improving the safety of the broadcasting and television broadcasting system can realize the checking and switching processing of abnormal signal output conditions, avoid broadcasting accidents, achieve the switching mode of extremely high accuracy, extremely low time delay and adaptation to various abnormal link conditions, and improve the safety of the broadcasting and television broadcasting system.
Description
Technical Field
The invention relates to the field of broadcast television security, in particular to a frame sequence embedding and identifying method for improving the security of a broadcast television broadcasting system.
Background
In the broadcast television industry, the problem of safe broadcasting is of great importance. At present, in a broadcast television digital broadcasting system, all signal connections are often adopted as serial connections, see fig. 1, and in such a serial connection architecture, an abnormality of any node may cause an interruption of final output, where the devices 1 to 6 only schematically represent node devices adopted in the prior art, and specific devices are set according to circumstances, and are not limited.
For this, the broadcast television industry adopts a main-standby two-way parallel mode, and adds a main-standby link architecture of a converter before final output, see fig. 2, in this case, when a node on one link is abnormal, the link signal is interrupted, after the converter recognizes the signal interruption, the final output signal is switched to a second link signal to ensure that the output content is normal, the devices 1 to 6 only schematically represent node devices adopted in the prior art, the specific devices are set according to the situation without limitation, and the devices of the two links correspond one to one.
However, the inverter device can only determine whether the device signal is interrupted; however, in a real situation, the failure of the equipment in the link may not only cause one signal interruption but also cause various indirect signal interruptions, losses, and other abnormalities such as loss of audio signals in the video signal, loss of video signals in the audio signal, instability of the overall signal, and the like. In this case, if only whether the signal is lost or not can be determined, abnormal signal output may occur, resulting in a very serious broadcast accident.
Disclosure of Invention
The present invention aims to provide a frame sequence embedding and identification method for improving the security of a broadcast television broadcasting system, so as to solve the above-mentioned problems.
In order to solve the above technical problems, the present invention provides a frame sequence embedding and identifying method for improving the security of a broadcast television broadcasting system, which comprises embedding unique frame sequence information in an information layer of each frame in the digital video/audio signal transmission, wherein the frame sequence information embedded in each frame is different.
Receiving the digital video and audio signals embedded with the frame sequence information, decoding and analyzing the frame sequence information, and selecting to switch output signals according to the analysis result; if the signal is not abnormal, outputting a main path signal; if the signal is abnormal, the backup path signal is output in a switching way.
Further, the frame sequence information includes inherent information and time code information, and the time code information is derived from PTP or NTP or REF.
Further, the frame sequence information is embedded in any node device of the digital video and audio signal transmission, and the frame sequence information embedding technology is as follows: acquiring a current synchronous time code value of the equipment, and converting the time code value into a time code character string; merging the converted time code character string and the fixed interpolation information to obtain independent password information; encrypting the independent cipher information by using an MD5 encryption algorithm to obtain frame sequence information; the frame sequence information is correspondingly written into each frame information layer of the digital video-audio signal.
Further, a unique frame sequence signal is inserted into each frame of the video scheduling matrix node device in the digital video and audio signal transmission.
Further, each node device of the digital video and audio signal transmission is embedded with set frame sequence information.
Further, receiving the digital video and audio signal embedded with the frame sequence information, and performing decryption operation on the frame sequence information to obtain a time code character string and fixed interpolation information contained in the frame sequence information; acquiring a synchronous time code value of the current equipment, and converting the time code value into a new time code character string; and comparing the difference value of the new time code character string with the time code character string obtained by the decryption operation to obtain time code difference value data.
Comparing the difference value of the set fixed interpolation information with the fixed interpolation information obtained by the decryption operation to obtain interpolation difference value data; if the time code difference data is within 0-1 and the interpolation difference data is 0, indicating that the signal is not abnormal, and directly outputting a main path signal; if the time code difference data is greater than 1 or the interpolation difference data is greater than 0, the signals are represented to be abnormal, the output signals are inverted, and the standby signals are output.
Further, the digital video and audio signal transmission adopts an active/standby link architecture which is an FPGA or an X86.
Further, the digital video and audio signal transmission is at least a double-link structure.
The invention has the beneficial effects that: the frame sequence embedding and identifying method for improving the safety of the broadcasting and television broadcasting system additionally adds the set frame sequence content in the digital video and audio signal transmission, and converts the mode of the identification logic of the switching equipment from the signal conversion into the mode of detecting the frame sequence information in the information layer of each frame of the digital video and audio signal, thereby achieving the switching mode with extremely high accuracy, extremely low time delay and adaptation to various link abnormal conditions and greatly improving the safety of the broadcasting and television broadcasting system.
Drawings
Fig. 1 schematically shows a prior art serial architecture digital video/audio signal transmission system.
Fig. 2 is a schematic diagram of a prior art digital video-audio signal transmission system with a main-standby dual-channel parallel architecture.
Fig. 3 is a flow diagram schematically illustrating a method for embedding and identifying a sequence of frames for improving the security of a broadcast television broadcasting system.
Fig. 4 schematically shows an embedding flow diagram of a unique frame sequence signal.
Fig. 5 is a block diagram schematically illustrating a flow of analyzing, processing and outputting the received audio and video signals by the backend device.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," and "connected" are to be construed broadly, e.g., as meaning fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
The following detailed description is made with reference to the embodiments, and reference is made to fig. 1 to 5, and for the sake of simplicity, technical common knowledge known to those skilled in the art is omitted.
Example one
The method for embedding and identifying the frame sequence for improving the safety of the broadcast television broadcasting system comprises the steps of embedding unique frame sequence information in an information layer of each frame in digital video and audio signal transmission, wherein the frame sequence information embedded in each frame is different.
The frame sequence information is embedded in the information layer of each frame of the video and audio signal, and the unique frame sequence information is embedded in the information layer of each frame. Because the data quantity of the frame sequence is extremely small, the data quantity is 5 bytes, and the embedded data is not in the main content of the current frame signal, when the signal of the embedded frame sequence enters the processing flow of the main body of the equipment, the signal of the embedded frame sequence can not have any influence on the due processing of the equipment, the embedded frame sequence information can be continuously transmitted to the back end in synchronization with the signal, and the quality, the transmission delay and the like of the whole video signal can not be influenced at all.
And then receiving the digital video and audio signals embedded with the frame sequence information, decoding and analyzing the frame sequence information, and selecting to switch output signals according to the analysis result. If the signal is not abnormal, outputting a main path signal; if the signal is abnormal, the backup path signal is output in a switching way.
The method and the device have the advantages that the set frame sequence content is additionally added in the digital video and audio signal transmission, and the mode that the switching equipment identification logic is changed from the mode that whether the signal is converted into the mode that the frame sequence information in the information layer of each frame of the digital video and audio signal is detected is changed, so that the switching mode with extremely high accuracy, extremely low time delay and adaptability to various link abnormal conditions is achieved, and the safety of a broadcasting and television broadcasting system is greatly improved.
The frame sequence embedding and identifying method for improving the safety of the broadcast television broadcasting system utilizes a frame sequence technology to embed a frame sequence in any node equipment in digital video and audio signal transmission and identify and decode frame sequence information in the final switching equipment, the data volume of the frame sequence information is small, the video and audio signal transmission interval is not occupied, the signal transmission quality is not influenced, and the signal transmission delay is not increased.
Example two
According to a preferred embodiment of the present application, the frame sequence information of the frame sequence embedding and identifying method for improving the security of the broadcast television broadcasting system includes inherent information and time code information. The time code information can be derived from PTP, NTP or REF, that is, the time code information in the current node device is read in real time and is combined with the inherent interpolation information.
Because the time code information of each frame in the video and audio signal is different, the time code information can be directly matched with the set inherent interpolation information to be used as the inserted unique frame sequence information, so that the frame sequence information embedded in each frame is different.
In a specific implementation, the frame sequence information can be embedded in any node device of the digital video and audio signal transmission. Conventionally, node devices for digital video and audio signal transmission include, but are not limited to, a switching scheduling matrix node device, a switcher node device, a keyer node device, a beacon node device, and a loudness controller node device, in that order.
It may be preferred to embed unique frame sequences in the head-end device, i.e. to insert a unique frame sequence signal into each frame of the video scheduling matrix node device in the digital video audio signal transmission.
The frame sequence information embedding technology comprises the following steps: and acquiring the current synchronous time code value of the equipment, and converting the time code value into a time code character string. And then, merging the converted time code character string and the fixed interpolation information to obtain independent password information. Then, the MD5 encryption algorithm is used for encrypting the independent cipher information to obtain frame sequence information; the frame sequence information is then written into each frame information layer of the digital video/audio signal correspondingly.
The method includes the steps that current time code information LTC in node equipment is obtained, the time code information LTC and fixed interpolation information INFO are converted into a group of independent codes eLTC through an encryption algorithm, and the independent codes eLTC are written into a video and audio signal information layer to ensure that the independent codes eLTC are directly transmitted without being processed when passing through middle-end equipment.
Actually, it embeds the unique frame sequence information after the signal input preprocessing without affecting the existing functions of the device, since the frame sequence data amount is very small, 5 bytes, and the embedded data is not in the current frame signal body content; therefore, when the signal embedded with the frame sequence enters the processing flow of the main body of the device, no influence is caused on the proper processing of the device, and the embedded frame sequence information can be continuously transmitted to the back end in synchronization with the signal.
EXAMPLE III
In this embodiment, on the basis of the foregoing embodiment, it may be further limited that the digital video/audio signal transmission is made to adopt an active/standby link architecture of FPGA or X86.
According to the method and the device, the unique frame sequence is embedded and processed, on the basis of the provided interfaces of X86 or FPGA, under the conditions that too much cost is not increased and hardware equipment is not replaced, each node equipment on a signal transmission link in a broadcast television broadcasting system can be upgraded through modes of FPGA firmware, X86R software upgrading and updating and the like, and the safety of the whole system is improved.
Example four
According to an embodiment of the application, the digital video and audio signal transmission involved in the frame sequence embedding and identification method for improving the security of the broadcast television broadcasting system adopts at least a double-link architecture, and not only the double-link architecture, but also a multi-link architecture, three paths or four paths and the like which can be specifically selected according to actual conditions, and the specific limitations are not limited.
EXAMPLE five
In this embodiment, the back-end node device, i.e. the switching device, performs signal screening output, and outputs a completely prepared digital video/audio signal according to the embedded frame sequence signal condition.
The specific processing mode is that the digital video and audio signal embedded with the frame sequence information is received, and the frame sequence information is decrypted to obtain the time code character string and the fixed interpolation information contained in the frame sequence information.
Acquiring a synchronous time code value of current equipment, namely the synchronous time code value of rear-end node equipment, and converting the time code value into a new time code character string; and then, comparing the difference value of the new time code character string with the time code character string obtained by the decryption operation to obtain time code difference value data.
And simultaneously, performing difference comparison on the set fixed interpolation information and the fixed interpolation information obtained by decryption operation to obtain interpolation difference data, and analyzing and judging the obtained time code difference data and the interpolation difference data.
If the time code difference data is within 0-1 and the interpolation difference data is 0, indicating that the signal is not abnormal, and directly outputting a main path signal; if the time code difference data is greater than 1 or the interpolation difference data is greater than 0, the signal is indicated to be abnormal, the output signal is inverted through the inverter, and the standby signal is output.
Of course, in the signal input preprocessing process of the switching device, the frame sequence information can be acquired through an independent process, and the overall process is not affected. The frame sequence is subjected to the rapid verification identification in the mode in an independent process, and due to the adoption of a unique processing method, the identification time is far shorter than the time of processing a frame of video signal by the switching equipment; and according to the identification condition, sending two kinds of data of 'normal'/'abnormal' to the rear-end processing module and the switching equipment, and carrying out switching selection processing on the signals by the rear-end existing selection module according to the information.
The frame sequence embedding and identifying method for improving the safety of the broadcast television broadcasting system can realize full-automatic non-delay automatic switching when the link equipment is abnormal and has faults by monitoring the frame sequence on a final switcher aiming at the embedded unique frame sequence in the output processing of digital video and audio signals, thereby avoiding the occurrence of abnormal signal output and causing serious broadcasting accidents.
EXAMPLE six
According to a practical aspect of the present application, it may be further preferable that the set frame sequence information is embedded in each node device of the digital video/audio signal transmission based on the above-described embodiment.
And because the frame sequence information embedded in each node device is different and has a unique algorithm, the received frame sequence information is decoded and judged, and whether the signal content of the same frame is abnormal or not is judged according to the frame sequence decoding content, so that the abnormal signal output condition can be checked and switched, and broadcasting accidents are avoided. And the fault to a certain node device can be accurately positioned according to the decoded frame sequence content, so that the safety and the accuracy are improved, and the fault device can be directly positioned.
In practical application, compared with the prior art of identifying logic for checking whether the signal has a transition, the digital video/audio signal embedding and identifying frame sequences in the digital video/audio signal show the following advantages:
the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (8)
1. A frame sequence embedding and identifying method for improving the security of a broadcast television broadcasting system is characterized by comprising the following steps:
s1, in the transmission of digital video and audio signals, unique frame sequence information is embedded in an information layer of each frame, and the embedded frame sequence information in each frame is different;
s2, receiving the digital video and audio signals embedded with the frame sequence information, decoding and analyzing the frame sequence information, and selecting to switch output signals according to an analysis result;
if the signal is not abnormal, outputting a main path signal; if the signal is abnormal, the backup path signal is output in a switching way.
2. The method for embedding and identifying a sequence of frames for improving the security of a broadcast television broadcasting system as claimed in claim 1, wherein: the frame sequence information comprises inherent information and time code information, and the time code information is derived from PTP or NTP or REF.
3. The method for embedding and identifying frame sequences for improving the security of a broadcast television broadcasting system according to claim 1, wherein the frame sequence information is embedded in any node device of the digital video/audio signal transmission, and the frame sequence information embedding technique is as follows:
s11, acquiring a current synchronous time code value of the equipment, and converting the time code value into a time code character string;
s12, merging the converted time code character string and the fixed interpolation information to obtain independent password information;
s13, encrypting the independent cipher information by using an MD5 encryption algorithm to obtain the frame sequence information;
s14, correspondingly writing the frame sequence information into each frame information layer of the digital video and audio signal.
4. The method for embedding and identifying a sequence of frames for improving the security of a broadcast television broadcasting system as claimed in claim 3, wherein: a unique frame sequence signal is inserted into each frame of a video scheduling matrix node device in digital video and audio signal transmission.
5. The method for embedding and identifying a sequence of frames for improving the security of a broadcast television broadcasting system as claimed in claim 1, wherein: the set frame sequence information is embedded in each node device of the digital video and audio signal transmission.
6. The method for embedding and identifying a sequence of frames for improving the security of a broadcast television broadcasting system as claimed in claim 1, wherein the step S2 comprises the steps of:
s21, receiving a digital video and audio signal embedded with frame sequence information, and carrying out decryption operation on the frame sequence information to obtain time code character strings and fixed interpolation information contained in the frame sequence information;
s22, acquiring a synchronous time code value of the current equipment, and converting the time code value into a new time code character string;
s23, comparing the difference value of the new time code character string with the time code character string obtained through decryption operation to obtain time code difference value data; comparing the difference value of the set fixed interpolation information with the fixed interpolation information obtained by the decryption operation to obtain interpolation difference value data;
if the time code difference data is within 0-1 and the interpolation difference data is 0, indicating that the signal is not abnormal, and directly outputting a main path signal;
if the time code difference data is greater than 1 or the interpolation difference data is greater than 0, the signals are represented to be abnormal, the output signals are inverted, and the standby signals are output.
7. The method for embedding and identifying a sequence of frames for improving the security of a broadcast television broadcasting system as claimed in claim 1, wherein: the digital video and audio signal transmission adopts an active/standby link architecture of FPGA or X86.
8. The method for embedding and identifying a sequence of frames for improving the security of a broadcast television broadcasting system as claimed in claim 1, wherein: the digital video and audio signal transmission adopts at least a double-link architecture.
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Application publication date: 20210813 |