CN115550736A - Video privacy area acquisition and transmission method and device, electronic equipment and medium - Google Patents
Video privacy area acquisition and transmission method and device, electronic equipment and medium Download PDFInfo
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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
- H04N21/45—Management operations performed by the client for facilitating the reception of or the interaction with the content or administrating data related to the end-user or to the client device itself, e.g. learning user preferences for recommending movies, resolving scheduling conflicts
- H04N21/462—Content or additional data management, e.g. creating a master electronic program guide from data received from the Internet and a Head-end, controlling the complexity of a video stream by scaling the resolution or bit-rate based on the client capabilities
- H04N21/4627—Rights management associated to the content
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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
- H04N21/25—Management operations performed by the server for facilitating the content distribution or administrating data related to end-users or client devices, e.g. end-user or client device authentication, learning user preferences for recommending movies
- H04N21/266—Channel or content management, e.g. generation and management of keys and entitlement messages in a conditional access system, merging a VOD unicast channel into a multicast channel
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- 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
- H04N21/44—Processing of video elementary streams, e.g. splicing a video clip retrieved from local storage with an incoming video stream or rendering scenes according to encoded video stream scene graphs
- H04N21/44008—Processing of video elementary streams, e.g. splicing a video clip retrieved from local storage with an incoming video stream or rendering scenes according to encoded video stream scene graphs involving operations for analysing video streams, e.g. detecting features or characteristics in the video stream
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Abstract
The invention discloses a method, a device, electronic equipment and a medium for acquiring and transmitting a video privacy area. The method comprises the following steps: if the privacy zone acquisition message sent by the server is determined to be received, determining at least one target multicast group according to the privacy zone acquisition message; sending a target multicast group joining message to a gateway router to join a target multicast group, wherein a target local area network address in the target multicast group joining message is a unicast local area network address matched with the gateway router; and if the video stream of at least one target multicast group sent by the gateway router is determined to be received, acquiring a video privacy area according to the video stream of the target multicast group. According to the scheme, the authorized user can acquire the privacy area, the unauthorized user is prevented from acquiring the privacy area, and the safety of scrambled video is improved.
Description
Technical Field
The present invention relates to the field of data transmission technologies, and in particular, to a method, an apparatus, an electronic device, and a medium for acquiring and transmitting a video privacy area.
Background
In order to prevent unauthorized users from accessing the privacy zone in the video, the privacy zone in the transmitted and stored video images is typically scrambled to ensure that the unauthorized users cannot view the relevant content of the privacy zone. Typically, a rectangular frame may be used to block the privacy area in each frame of video frame image.
In order to ensure that an authorized user can view the content of a privacy area while scrambling a video, a client descrambling mode is generally adopted in the prior art, that is, a video encoding end sends the descrambling mode to the client of the authorized user, but this also means that the descrambling mode is disclosed, which increases the security risk.
Disclosure of Invention
The invention provides a method, a device, electronic equipment and a medium for acquiring and transmitting a video privacy area, which are used for preventing an unauthorized user from acquiring the privacy area while ensuring that the authorized user can acquire the privacy area, and improving the security of scrambled video.
In a first aspect, an embodiment of the present invention provides a method for acquiring a video privacy area, where the method is performed by a client having a viewing right of the video privacy area, and the method includes:
if the privacy zone acquisition message sent by the server is determined to be received, determining at least one target multicast group according to the privacy zone acquisition message;
sending a target multicast group joining message to a gateway router to join a target multicast group, wherein a target local area network address in the target multicast group joining message is a unicast local area network address matched with the gateway router;
and if the fact that at least one target multicast group video stream sent by the gateway router is received is determined, acquiring a video privacy area according to the target multicast group video stream, and obtaining a plaintext video according to the video privacy area and each frame of video frame image after scrambling.
In a second aspect, an embodiment of the present invention provides a transmission method for a video privacy area, where the transmission method is executed by a gateway router, and the method includes:
receiving at least one target multicast group join message through a target interface;
if the destination local area network address of the target multicast group join message is determined to be a unicast local area network address matched with the gateway router, determining at least one source internet protocol address according to the target multicast group join message, wherein the source internet protocol address is a unicast internet protocol address;
and sending the target multicast group video stream to the client matched with the source Internet protocol address in a unicast video stream mode through a target interface.
In a third aspect, an embodiment of the present invention further provides an apparatus for acquiring a video privacy area, where the apparatus is configured to a client having a viewing right of the video privacy area, and the apparatus includes:
the target multicast group determining module is used for determining at least one target multicast group according to the privacy zone acquisition message if the privacy zone acquisition message sent by the server is determined to be received;
a join message sending module, configured to send a target multicast group join message to a gateway router to join a target multicast group, where a destination local area network address in the target multicast group join message is a unicast local area network address matched with the gateway router;
and the privacy area acquisition module is used for acquiring a video privacy area according to the target multicast group video stream if at least one target multicast group video stream sent by the gateway router is determined to be received, so as to obtain a plaintext video according to the video privacy area and each scrambled frame video frame image.
In a fourth aspect, an embodiment of the present invention further provides an apparatus for transmitting a video privacy area, where the apparatus is configured in a gateway router, and the apparatus includes:
a join message receiving module, configured to receive at least one target multicast group join message through a target interface;
a protocol address determining module, configured to determine at least one source internet protocol address according to the target multicast group join message if it is determined that a destination local area network address of the target multicast group join message is a unicast local area network address matching the gateway router, where the source internet protocol address is a unicast internet protocol address;
and the video stream sending module is used for sending the target multicast group video stream to the client matched with the source Internet protocol address in a unicast video stream mode through the target interface.
In a fifth aspect, an embodiment of the present invention further provides an electronic device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, where the processor executes the computer program to implement the method for acquiring a video privacy zone or the method for transmitting a video privacy zone according to any one of the embodiments of the present invention.
In a sixth aspect, embodiments of the present invention further provide a storage medium storing computer-executable instructions, which when executed by a computer processor, are configured to perform the video privacy zone acquisition method or the video privacy zone transmission method according to any one of the embodiments of the present invention.
According to the technical scheme of the embodiment of the invention, if the client determines to receive the privacy zone acquisition message sent by the server, at least one target multicast group is determined according to the privacy zone acquisition message; then sending a target multicast group joining message to the gateway router so as to join the target multicast group; if the fact that at least one target multicast group video stream sent by the gateway router is received is determined, the video privacy area is obtained according to the target multicast group video stream, so that the fact that unauthorized users obtain the privacy area is avoided while the fact that authorized users can obtain the privacy area is guaranteed, and safety of scrambled videos is improved.
It should be understood that the statements in this section do not necessarily identify key or critical features of the embodiments of the present invention, nor do they necessarily limit the scope of the invention. Other features of the present invention will become apparent from the following description.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a flowchart of a method for acquiring a video privacy area according to an embodiment of the present invention;
fig. 2 is a flowchart of a transmission method for a video privacy area according to a second embodiment of the present invention;
fig. 3 is a schematic structural diagram of a video privacy zone protection system provided in a first specific application scenario of the present invention;
fig. 4 is a schematic structural diagram of an apparatus for acquiring a video privacy area according to a third embodiment of the present invention;
fig. 5 is a schematic structural diagram of a transmission apparatus for a video privacy area according to a fourth embodiment of the present invention;
fig. 6 is a schematic structural diagram of an electronic device according to a fifth embodiment of the present invention.
Detailed Description
In order to make the technical solutions of the present invention better understood, 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 only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, shall fall within the protection scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or described herein. Moreover, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
Example one
Fig. 1 is a flowchart of an obtaining method of a video privacy area according to an embodiment of the present invention, where this embodiment is applicable to a high-permission client for obtaining video data containing scrambling areas such as sensitive areas and private areas, and the method may be executed by an obtaining apparatus of the video privacy area, where the obtaining apparatus of the video privacy area may be implemented in a form of hardware and/or software, and the obtaining apparatus of the video privacy area may be configured in a client having a viewing permission of the video privacy area.
As shown in fig. 1, the method includes:
s110, if the privacy zone acquisition message sent by the server is determined to be received, determining at least one target multicast group according to the privacy zone acquisition message.
The scheme can be executed by a client with a video privacy area viewing permission, the client can interact with a server, and video data collected by a shooting device is obtained through the server. When a shooting device such as a camera collects a video frame image containing sensitive, private and other target events, an image area related to the target events in the video frame image can be scrambled, for example, blocked by a mosaic, so that a user can watch an open, green and healthy scrambled video. The image area related to the target event can be used as a privacy area of the video frame image. Some users, such as security personnel, management personnel, etc., can view the plaintext video through the client with the viewing authority of the video privacy area. The client with the video privacy area viewing permission can be a specific client, such as a monitoring room computer, or can be a client logged in by an account with the video privacy area viewing permission, such as a client with an account A opening the video privacy area viewing permission, and the client logged in by the account A can be used for on-demand viewing of a plaintext video.
After detecting that a client with the video privacy area viewing authority requests a plaintext video, the server can notify the shooting device to independently code a video stream for the privacy area in the video frame image, and the video stream is sent by adopting a multicast address different from a scrambled video. Meanwhile, the client with the viewing authority of the video privacy area can acquire the scrambled video according to the multicast address of the scrambled video, and it should be noted that the multicast group of the scrambled video is different from the target multicast group. The server can send a privacy zone acquisition message to the client with the video privacy zone viewing authority after detecting that the privacy zone encoding by the shooting device is completed. The privacy area acquisition message may include information such as a plaintext video identifier, a client address, and a target multicast group IP (Internet Protocol) address, where the target multicast group may be a multicast group capable of acquiring a video stream of the privacy area in the video frame image. After receiving the privacy zone acquisition message, the client having the video privacy zone viewing right can determine the target multicast group according to the IP address of the target multicast group in the privacy zone acquisition message.
It should be noted that the target event may be one or more, correspondingly, the privacy area in the video frame image may also be one or more, the shooting device may encode one or more video streams separately according to different target events or different privacy areas, so as to distinguish the target event or the privacy area, and if multiple video streams are encoded, the multiple video streams are sent to different multicast groups respectively. Thus, the server may send a corresponding privacy zone acquisition message for each video stream. The client can acquire the message according to each privacy zone and determine the corresponding target multicast group. For example, the shooting device generates a multicast video stream for the scrambled video, and performs multicast through the multicast group address a. The number of privacy areas in the video frame image of the scrambled video is 3, the shooting device generates 3 multicast video streams for the 3 privacy areas respectively, and the multicast group addresses can be B1, B2 and B3 respectively.
And S120, sending a target multicast group joining message to the gateway router so as to join the target multicast group, wherein the target local area network address in the target multicast group joining message is a unicast local area network address matched with the gateway router.
After determining the target multicast group, the client having the video privacy zone viewing permission may send a target multicast group join message to the gateway router. The target multicast Group join message may be determined based on a Group Management Protocol (IGMP), and may include information such as an IP address of the target multicast Group, a destination local area network address, a source Internet Protocol address, an IGMP version, an IGMP type, and a checksum. It should be noted that the destination lan address of the target multicast group join message is not a multicast lan address, but a unicast lan address. The destination lan address is a Media Access Control (MAC) address, the unicast lan address is a unicast MAC address, and the unicast MAC address is a unicast MAC address corresponding to the gateway router. The unicast lan Address may be extracted from an Address Resolution Protocol (ARP) of the client. The source internet protocol address refers to a source IP address of a client with a video privacy area viewing permission, and the gateway router can send the target multicast group video stream coded by the video privacy area to the client with the video privacy area viewing permission through the source IP address.
In this embodiment, the gateway router may receive a target multicast group join message through the input interface, may extract a target MAC address according to the target multicast group join message, and if the gateway router determines that the target MAC address of the target multicast group join message is a unicast MAC address matching with the gateway router itself, determine that the received target multicast group join message is an IGMP message sent by a client having a video privacy area view authority, at this time, the gateway router adds the client having the video privacy area view authority to the target multicast group, and registers an IP address of the client having the video privacy area view authority in the multicast forwarding table entry.
In the scheme, the unicast local area network address is used as the destination local area network address in the target multicast group adding message, rather than the traditional multicast MAC address corresponding to the IP address of the target multicast group as the destination local area network address. The reason for this is that if the destination lan address of the target multicast group join message is the multicast MAC address corresponding to the target multicast group IP address, when the client connects to the gateway router through the ordinary two-layer switch, the ordinary two-layer switch may broadcast the message whose destination lan address is the multicast MAC address. Other unauthorized clients can also obtain the target multicast group IP address and the corresponding multicast MAC address after receiving the message. When the destination local area network address adopts the unicast local area network address, the common two-layer switch only forwards the message to the gateway router, and does not broadcast, thereby avoiding that an unauthorized client acquires the message of the target multicast group IP address and the corresponding multicast MAC address by monitoring the multicast Ethernet frame through a two-layer network.
S130, if at least one target multicast group video stream sent by the gateway router is determined to be received, a video privacy area is obtained according to the target multicast group video stream, and a plaintext video is obtained according to the video privacy area and each frame of video frame image after scrambling.
It is easy to understand that the shooting device generates the scrambled multicast group video stream according to each frame of video frame image after scrambling, and performs multicast on the scrambled multicast group video stream through the scrambled multicast group, and after the client with or without the viewing authority of the video privacy area joins the scrambled multicast group, the scrambled multicast group video stream can be obtained. For example, the scrambled multicast group video stream may be multicast through multicast group a. Meanwhile, after the client with the viewing permission of the video privacy area joins the target multicast group, the client can receive the video stream of the target multicast group sent by the gateway router. The client with the video privacy area viewing authority can decode the target multicast group video stream to obtain the privacy area in each video frame image. For example, the target multicast group may be multicast group B. After the scrambled multicast group video stream for encoding the scrambled video frame image and the target multicast group video stream for encoding the privacy area are obtained, the client can perform image restoration by using the privacy area in each video frame image on the basis of the video frame image of the scrambled video, so that the descrambled video frame image, namely the plaintext video, is obtained.
In this solution, optionally, sending the target multicast group join message to the gateway router includes:
determining a unicast local area network address matched with the gateway router according to a locally stored address resolution protocol table;
and taking the unicast local area network address as a destination local area network address of the target multicast group adding message, and sending the target multicast group adding message to the gateway router.
It will be appreciated that the address resolution protocol table may be used to cache the correspondence of the IP address of the gateway router to the unicast MAC address of the gateway router. The use of the ARP table can limit the number of network broadcasts. The client with the viewing permission of the video privacy area can search a unicast MAC address corresponding to the IP address of the gateway router in a locally stored address resolution protocol table. The client may use the unicast MAC address as a destination MAC address of the target multicast group join message and send the target multicast group join message to the gateway router.
According to the scheme, the client modifies the destination local area network address into the unicast local area network address, so that the situation that the client without the viewing permission of the video privacy area also receives the target multicast group joining message when the exchanger broadcasts the message is avoided. The scheme can effectively prevent the client side without the viewing authority of the video privacy area from acquiring the IP address of the target multicast group and the corresponding multicast MAC address through network interception, thereby greatly improving the security of private video data transmission.
In a feasible scheme, the target multicast group video stream is obtained by encoding a privacy area of each frame of video frame image by a shooting device;
after acquiring the video privacy zone according to the target multicast group video stream, the method further comprises the following steps:
determining the relative position relation between the privacy area of each frame of video frame image and each frame of video frame image according to the message encapsulation field of the target multicast group video stream;
and merging the scrambled video frame images and the privacy areas of the video frame images according to the relative position relation between the privacy areas of the video frame images and the video frame images to obtain the descrambled video frame images.
As will be readily understood, the packet encapsulation field of the target multicast group video stream may include information such as a timestamp of each video frame image, an association relationship between the privacy zone and the video frame image, a shape of the privacy zone, and a position of the privacy zone in the video frame image. Specifically, the shape of the privacy area may be a regular image such as a rectangle, a circle, and a triangle, or may be an irregular image formed based on the outline of a target object in the image. The position of the privacy zone in the video frame image can be described by the boundary of the privacy zone, and also can be described by the geometric center of the privacy zone. In a specific example, the shape of the privacy area may be a rectangle, and the position of the privacy area may be described by coordinates of four vertices of the authority area, or may be described by coordinates of a center of the privacy area, a length of the privacy area, and a width of the privacy area.
In the scheme, the position information of the privacy zone in the video image can be the relative position information of the privacy zone in the video frame image, so that the message encapsulation field does not need to carry the size information of the privacy zone. The client may correspond each privacy area to each video frame image according to the timestamp or the affiliation between the privacy area and the video frame image. Wherein one video frame image may correspond to one or more privacy zones. And according to the relative position relation of each video frame image and the privacy area corresponding to each video frame image. E.g., the relative position of the vertex in the upper left corner of the privacy zone shaped as a rectangle to the vertex in the upper left corner of the video frame image. The client side can perform image combination according to the relative position relation between the video frame images and the privacy area, so that each descrambled video frame image is obtained. And according to each video frame image after descrambling, the client can generate a plaintext video.
The scheme realizes the descrambling of each video frame image through the relative position relation between each privacy zone and each video frame image. Compared with image descrambling based on the position relation between each privacy area and each video frame image, the message encapsulation field of the target multicast group video stream can carry a smaller amount of information, and the descrambling of the video frame image is realized by adopting a simpler and more convenient mode.
It should be noted that, when there are a plurality of privacy areas in the video frame image of the scrambled video, the shooting device generates multicast video streams for the plurality of privacy areas respectively, and sends the multicast video streams to different multicast groups respectively, in this case, the client having the video privacy area viewing authority acquires each privacy area in the same manner as in S110 to S130 of this embodiment. Specifically, the method comprises the following steps: the server sends corresponding privacy zone acquisition messages aiming at the privacy zones, and the client can extract and obtain the target multicast group IP addresses corresponding to the privacy zone acquisition messages according to the privacy zone acquisition messages and generate corresponding target multicast group join messages according to the target multicast group IP addresses. And the client with the viewing authority of the video privacy area sends the joining information of each target multicast group to the gateway router respectively, and the destination MAC address of the joining information of each target multicast group is the unicast MAC address of the gateway router respectively. After the gateway router respectively adds the client with the video privacy area viewing authority to each target multicast group, the client with the video privacy area viewing authority receives the video stream of each target multicast group and respectively determines each video privacy area.
In this embodiment, the client having the viewing right of the video privacy area can obtain the video stream of the target multicast group sent by the gateway router, so as to obtain the video privacy area, and combine the video privacy area with the scrambled video frame image, so as to obtain the plaintext video. However, for a client without the viewing right of the video privacy area, the client can only receive the scrambled multicast group video stream sent by the gateway router through the scrambled video sending interface, and obtain each scrambled video frame image. According to the technical scheme of the embodiment of the invention, if the client determines to receive the privacy zone acquisition message sent by the server, at least one target multicast group is determined according to the privacy zone acquisition message; then sending a target multicast group joining message to the gateway router so as to join the target multicast group; if the fact that at least one target multicast group video stream sent by the gateway router is received is determined, the video privacy area is obtained according to the target multicast group video stream, so that the fact that unauthorized users obtain the privacy area is avoided while the fact that authorized users can obtain the privacy area is guaranteed, and safety of scrambled videos is improved.
Example two
Fig. 2 is a flowchart of a transmission method for a video privacy area according to a second embodiment of the present invention, where this embodiment is applicable to a transmission scenario of a gateway router for video data including scrambling areas of sensitivity, privacy, and the like, and the method may be executed by a transmission apparatus for the video privacy area, where the transmission apparatus for the video privacy area may be implemented in a form of hardware and/or software, and the transmission apparatus for the video privacy area may be configured in the gateway router.
As shown in fig. 2, the method includes:
s210, receiving at least one target multicast group joining message through a target interface.
The present solution may be performed by a gateway router, which may comprise one or more interfaces, wherein the target interface may be an input/output interface, such as interface I. Through the destination interface, the gateway router may receive the destination multicast group join message. The target multicast Group join message may be determined based on a Group Management Protocol (IGMP), and may include information such as an IP address of the target multicast Group, a destination local area network address, a source Internet Protocol address, an IGMP version, an IGMP type, and a checksum.
S220, if the destination local area network address of the target multicast group adding message is determined to be a unicast local area network address matched with the gateway router, determining at least one source Internet protocol address according to the target multicast group adding message, wherein the source Internet protocol address is a unicast Internet protocol address.
If the destination MAC address of the target multicast group join message is the unicast MAC address of the gateway router, the client side sending the target multicast group join message has the video privacy area viewing permission, and the gateway router can send the target multicast group video stream to the client side. The gateway router may extract the source internet protocol address in the target multicast group join information, i.e., the IP address of the client having the viewing right of the video privacy area. It should be noted that the source internet protocol address in the target multicast group joining information is not a multicast internet address, but a unicast internet protocol address, so as to implement targeted propagation of the target multicast video stream.
In this embodiment, if the destination MAC address of the target multicast group join message is the multicast MAC address corresponding to the IP address of the target multicast group, it indicates that the client sending the target multicast group join message does not have the viewing permission of the video privacy area. At this time, the gateway router does not send the video stream whose destination address is the multicast MAC address corresponding to the target multicast group IP address through the target interface, so as to prevent a client that does not have the viewing right in the video privacy area from acquiring the target multicast group video stream.
And S230, sending the target multicast group video stream to the client matched with the source Internet protocol address in a unicast video stream mode through a target interface.
The gateway router converts the target multicast group video stream into a unicast video stream form, and sends the target multicast group video stream to the client with the video privacy area viewing authority in the unicast video stream form through the target interface according to the IP address of the client with the video privacy area viewing authority extracted from the target multicast group join message, so as to prevent the client without the video privacy area viewing authority from acquiring the target multicast group video stream. The target multicast group video stream may be a video stream generated according to each privacy zone in each video frame image. The privacy zone may be an image zone in the video frame image that is involved in a target event such as sensitivity, privacy, etc.
On the basis of the above scheme, after determining at least one source internet protocol address according to the target multicast group join message, the method further comprises:
registering the source internet protocol address on a target interface of a multicast forwarding table item;
and sending the target multicast group joining message to an upstream router, and receiving the target multicast group video stream sent by the upstream router.
After extracting the source internet protocol address in the target multicast group joining information, the gateway router may register the source internet protocol address to a target interface of a multicast forwarding table entry to record a sending address of a video stream of the target multicast group. And a source internet protocol address in the target multicast group adding information is also the IP address of the client with the video privacy area viewing authority, and the address is registered on a target interface of the multicast forwarding table item to be used as a target IP address for the subsequent target multicast group video stream transmission. After address registration, the gateway router may send the target multicast group join information to the upstream router to acquire, by the upstream router, the target multicast group video stream sent by the camera. The upstream router may obtain, after receiving the target multicast group joining information, a target multicast group video stream generated by the shooting device according to the privacy area code in the video frame image, according to the target multicast group IP address in the target multicast group joining information.
According to the scheme, the source internet protocol address can be registered on the target interface of the multicast forwarding table entry, and the target multicast group video stream is sequentially sent to each source internet protocol address, so that the ordered management of the sending addresses is facilitated, and the accuracy and the reliability of video transmission are ensured.
On the basis of the scheme, the method further comprises the following steps: sending the video stream of the scrambled multicast group to the scrambled multicast group in the form of a multicast video stream through a scrambled video sending interface so as to enable the scrambled multicast group to multicast the video stream of the scrambled multicast group; the scrambled multicast group video stream comprises each frame video frame image after scrambling, and the scrambled multicast group is different from the target multicast group.
In the scheme, a shooting device scrambles each frame of video frame image to generate a scrambled multicast group video stream, and a gateway router receives the scrambled multicast group video stream and then sends the scrambled multicast group video stream to a scrambled multicast group in a multicast video stream mode through a scrambled video sending interface corresponding to a scrambled multicast group different from a target multicast group. The client with the viewing authority of the video privacy area and the client without the viewing authority of the video privacy area can both join the scrambling multicast group, so that the video stream of the scrambling multicast group is obtained. Meanwhile, the client with the viewing authority of the video privacy area obtains the video stream of the target multicast group through the target multicast group, so that the scrambled video frame image and the privacy area can be combined to obtain the plaintext video.
In the scheme, the gateway router sends the unicast video stream converted from the target multicast group video stream to the client with the video privacy area viewing authority only through the target interface, and prohibits sending the video stream with the target address as the IP address of the target multicast group through the target interface. And other interfaces of the gateway router perform normal transmission of other multicast video streams.
It should be noted that, if the gateway router receives a target multicast group join message of another client, the gateway router also copies the target multicast group video stream in the manner of S210-S230 and then sends the copied target multicast group video stream to another client.
Specifically, when a plurality of clients having a view permission in the video privacy area exist, each client sends a target multicast group join message to the gateway router, and after determining that a destination MAC address of the target multicast group join message is a unicast MAC address corresponding to the gateway router, the gateway router extracts an IP address of the client for the target multicast group join message and registers the IP address of the client on a target interface of a multicast forwarding table item every time the gateway router receives the target multicast group join message sent by one client through the target interface. After receiving the target multicast group video stream, the gateway router converts the target multicast group video stream into a unicast video stream form, copies the unicast video stream through a target interface, and sends each unicast video stream to each client according to the IP address of each client.
Illustratively, after receiving a first target multicast group join message sent by a client a through a target interface, a gateway router determines that a destination MAC address of the first target multicast group join message is a unicast MAC address corresponding to the gateway router, extracts an IP address of the client a according to the first target multicast group join message, and registers the IP address on the target interface of a multicast forwarding table entry. If the second target multicast group join message sent by the client B is received again at this time, and it is determined that the destination MAC address of the second target multicast group join message is the unicast MAC address corresponding to the gateway router, the IP address of the client B is extracted according to the second target multicast group join message, and is also registered on the target interface of the multicast forwarding table. And the gateway router receives the target multicast group video stream, converts the target multicast group video stream into a unicast video stream, takes the IP address of the client A as a destination address, and sends the unicast video stream to the client A. Meanwhile, because the IP address of the client B still exists on the target interface of the multicast forwarding table item, the unicast video stream is continuously copied, the IP address of the client B is used as the target address, and the copied unicast video stream is sent to the client B.
The technical scheme of the embodiment of the invention comprises the steps that at least one target multicast group adding message is received through a target interface, and if the target local area network address of the target multicast group adding message is determined to be a unicast local area network address matched with a gateway router, at least one source internet protocol address is determined according to the target multicast group adding message; and then, the target multicast group video stream is sent to the client matched with the source internet protocol address in a unicast video stream mode through the target interface, so that the authorized users can acquire the privacy area, the unauthorized users are prevented from acquiring the privacy area, and the safety of the scrambled video is improved.
Specific application scenario 1
Fig. 3 is a schematic structural diagram of a video privacy zone protection system provided in a specific application scenario of the present invention, and as shown in fig. 3, the video privacy zone protection system includes a camera, an upstream router, a gateway router, and at least one client. The shooting device in the system takes a camera as an example, the gateway router comprises an interface I, and the client comprises a high-authority client and/or a low-authority client.
The high-authority client side has the viewing authority of the video privacy area, and the low-authority client side does not have the viewing authority of the video privacy area.
In this applicable scenario, the process of the video privacy area protection scheme specifically includes:
after the video stream is scrambled by the camera, the scrambled video stream is sent through a scrambled multicast group address, for example, a multicast group address a. After detecting that the client with high authority requests the plaintext video, the server may notify the camera to separately encode the video stream for the privacy area in the video frame image, and transmit the video stream by using a target multicast group, for example, multicast group B.
The shape of the privacy area may be a rectangle, the position of the rectangle varies with the position of the privacy content in the video frame image, and the size of the rectangle in each video frame image may be different. The packet encapsulation field of the video stream of the privacy zone includes the relative position information of the privacy zone and the video frame images, and the relative position information of each frame of video frame image may be different. After the high-authority client receives the video stream of the privacy area, the privacy area can be directly covered on each frame of video frame image according to the relative position information of each frame of video frame image, and a plaintext video is obtained. The number of the privacy zones may be one or more, and when the number of the privacy zones is multiple, video streams of the corresponding multiple privacy zones are generated.
The server informs the camera to independently encode the video stream for the privacy area in the video frame image, and simultaneously sends privacy area acquisition information to the high-authority client, wherein the privacy area acquisition information comprises a multicast group address of the privacy area video stream, such as the address of a multicast group B, so as to inform the high-authority client to join the multicast group B.
Taking the processing flow of the high-permission client a as an example, after receiving the privacy zone acquisition message, the high-permission client a periodically sends an IGMP join message to the gateway router, where the IGMP join message includes the multicast group B to join the multicast group B. However, the destination MAC address of the IGMP join packet sent by the high-authority client a is the unicast MAC address of the gateway router, not the conventional multicast MAC address. The unicast MAC address of the gateway router may be extracted from the ARP entry local to the high-rights client a.
After receiving the IGMP join message, the interface I of the gateway router determines that the destination MAC address of the IGMP join message is the unicast MAC address of the gateway router, extracts the source IP address in the IGMP join message, that is, the IP address of the high-permission client a, and registers the IP address of the high-permission client a on the interface I of the multicast forwarding table entry. The gateway router sends a PIM (Protocol Independent Multicast) join message of the Multicast group B to the upstream router according to the normal Multicast group join flow. At this time, if the gateway router receives the IGMP join packet sent by the high-permission client B, the gateway router continues to register the IP address of the high-permission client B on the interface I of the multicast forwarding table entry.
After receiving the multicast video stream of the privacy area, the gateway router converts the multicast video stream of the privacy area into a unicast video stream, and sends the unicast video stream to the high-authority client A through the interface I according to the IP address of the high-authority client A. At this time, the interface I of the multicast forwarding table entry also has the IP address of the high-permission client B, and after the unicast video stream is copied, the unicast video stream is sent to the high-permission client B through the interface I according to the IP address of the high-permission client B. The interface I of the gateway router prohibits the transmission of the multicast video stream addressed to the multicast group B.
After receiving the unicast video stream, the high-authority client performs image merging on the unicast video stream and the scrambled video stream on the basis of timestamp matching to obtain a plaintext video, while the low-authority client can only obtain the scrambled video stream.
EXAMPLE III
Fig. 4 is a schematic structural diagram of an apparatus for acquiring a video privacy area according to a third embodiment of the present invention. As shown in fig. 4, the apparatus includes:
a target multicast group determining module 310, configured to determine, if it is determined that a privacy area acquisition message sent by a server is received, at least one target multicast group according to the privacy area acquisition message;
a join message sending module 320, configured to send a target multicast group join message to a gateway router to join a target multicast group, where a destination local area network address in the target multicast group join message is a unicast local area network address matched with the gateway router;
a privacy area obtaining module 330, configured to, if it is determined that at least one target multicast group video stream sent by the gateway router is received, obtain a video privacy area according to the target multicast group video stream, so as to obtain a plaintext video according to the video privacy area and each frame of video frame image after scrambling.
In this embodiment, optionally, the join message sending module 320 includes:
the address determining unit is used for determining a unicast local area network address matched with the gateway router according to a locally stored address resolution protocol table;
and the joining message sending unit is used for taking the unicast local area network address as a destination local area network address of the joining message of the target multicast group and sending the joining message of the target multicast group to the gateway router.
In a feasible scheme, the target multicast group video stream is obtained by encoding a privacy area of each frame of video frame image by a shooting device; the device further comprises:
the position relation determining module is used for determining the relative position relation between the privacy area of each frame of video frame image and each frame of video frame image according to the message encapsulation field of the target multicast group video stream;
and the video frame image generation module is used for merging the scrambled video frame images and the privacy areas of the video frame images according to the relative position relation between the privacy areas of the video frame images and the video frame images to obtain the descrambled video frame images.
The device for acquiring the video privacy zone provided by the embodiment of the invention can execute the method for acquiring the video privacy zone provided by any embodiment of the invention, and has corresponding functional modules and beneficial effects of the execution method.
Example four
Fig. 5 is a schematic structural diagram of a transmission apparatus of a video privacy area according to a fourth embodiment of the present invention. As shown in fig. 5, the apparatus includes:
a join message receiving module 410, configured to receive at least one target multicast group join message through a target interface;
a protocol address determining module 420, configured to determine at least one source internet protocol address according to the target multicast group join message if it is determined that a destination local area network address of the target multicast group join message is a unicast local area network address matched with the gateway router, where the source internet protocol address is a unicast internet protocol address;
and a video stream sending module 430, configured to send the target multicast group video stream to the client matched with the source internet protocol address in the form of a unicast video stream through the target interface.
On the basis of the above scheme, optionally, the apparatus further includes:
an address registration module, configured to register the source internet protocol address on a target interface of a multicast forwarding table entry;
and the first video stream sending module is used for sending the target multicast group joining message to an upstream router and receiving the target multicast group video stream sent by the upstream router.
In one possible implementation, the apparatus further includes:
the scrambling multicast group video stream multicast module is used for sending a scrambling multicast group video stream to a scrambling multicast group in a form of a multicast video stream through a scrambling video sending interface so as to enable the scrambling multicast group to multicast the scrambling multicast group video stream;
the scrambled multicast group video stream comprises frames of video frame images after scrambling, and the scrambled multicast group is different from the target multicast group.
The transmission device of the video privacy zone provided by the embodiment of the invention can execute the transmission method of the video privacy zone provided by any embodiment of the invention, and has corresponding functional modules and beneficial effects of the execution method.
EXAMPLE five
FIG. 6 illustrates a schematic diagram of an electronic device 510 that may be used to implement an embodiment of the invention. Electronic devices are intended to represent various forms of digital computers, such as laptops, desktops, workstations, personal digital assistants, servers, blade servers, mainframes, and other appropriate computers. The electronic device may also represent various forms of mobile devices, such as personal digital assistants, cellular phones, smart phones, wearable devices (e.g., helmets, glasses, watches, etc.), and other similar computing devices. The components shown herein, their connections and relationships, and their functions, are meant to be exemplary only, and are not meant to limit implementations of the inventions described and/or claimed herein.
As shown in fig. 6, the electronic device 510 includes at least one processor 511, and a memory communicatively connected to the at least one processor 511, such as a Read Only Memory (ROM) 512, a Random Access Memory (RAM) 513, and so on, wherein the memory stores a computer program executable by the at least one processor, and the processor 511 may perform various suitable actions and processes according to the computer program stored in the Read Only Memory (ROM) 512 or the computer program loaded from a storage unit 518 into the Random Access Memory (RAM) 513. In the RAM 513, various programs and data necessary for the operation of the electronic device 510 can also be stored. The processor 511, the ROM 512 and the RAM 513 are connected to each other by a bus 514. An input/output (I/O) interface 515 is also connected to bus 514.
Various components in the electronic device 510 are connected to the I/O interface 515, including: an input unit 516 such as a keyboard, a mouse, and the like; an output unit 517 such as various types of displays, speakers, and the like; a storage unit 518, such as a magnetic disk, optical disk, or the like; and a communication unit 519 such as a network card, modem, wireless communication transceiver, or the like. The communication unit 519 allows the electronic device 510 to exchange information/data with other devices via a computer network, such as the internet, and/or various telecommunications networks.
In some embodiments, the method of acquiring a video privacy zone or the method of transmitting a video privacy zone may be implemented as a computer program tangibly embodied in a computer-readable storage medium, such as the storage unit 518. In some embodiments, some or all of the computer program may be loaded and/or installed onto the electronic device 510 via the ROM 512 and/or the communication unit 519. When the computer program is loaded into RAM 513 and executed by processor 511, one or more steps of the above-described acquisition method of a video privacy zone or transmission method of a video privacy zone may be performed. Alternatively, in other embodiments, the processor 511 may be configured by any other suitable means (e.g., by means of firmware) to perform the acquisition method of the video privacy zone or the transmission method of the video privacy zone.
Various implementations of the systems and techniques described here above may be implemented in digital electronic circuitry, integrated circuitry, field Programmable Gate Arrays (FPGAs), application Specific Integrated Circuits (ASICs), application Specific Standard Products (ASSPs), system on a chip (SOCs), load programmable logic devices (CPLDs), computer hardware, firmware, software, and/or combinations thereof. These various embodiments may include: implemented in one or more computer programs that are executable and/or interpretable on a programmable system including at least one programmable processor, which may be special or general purpose, receiving data and instructions from, and transmitting data and instructions to, a storage system, at least one input device, and at least one output device.
Computer programs for implementing the methods of the present invention can be written in any combination of one or more programming languages. These computer programs may be provided to a processor of a general purpose computer, special purpose computer, or other programmable data processing apparatus, such that the computer programs, when executed by the processor, cause the functions/acts specified in the flowchart and/or block diagram block or blocks to be performed. A computer program can execute entirely on a machine, partly on a machine, as a stand-alone software package partly on a machine and partly on a remote machine or entirely on a remote machine or server.
In the context of the present invention, a computer-readable storage medium may be a tangible medium that can contain, or store a computer program for use by or in connection with an instruction execution system, apparatus, or device. A computer readable storage medium may include, but is not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any suitable combination of the foregoing. Alternatively, the computer readable storage medium may be a machine readable signal medium. More specific examples of a machine-readable storage medium would include an electrical connection based on one or more wires, a portable computer diskette, a hard disk, a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.
To provide for interaction with a user, the systems and techniques described here can be implemented on an electronic device having: a display device (e.g., a CRT (cathode ray tube) or LCD (liquid crystal display) monitor) for displaying information to a user; and a keyboard and a pointing device (e.g., a mouse or a trackball) by which a user can provide input to the electronic device. Other kinds of devices may also be used to provide for interaction with a user; for example, feedback provided to the user can be any form of sensory feedback (e.g., visual feedback, auditory feedback, or tactile feedback); and input from the user may be received in any form, including acoustic, speech, or tactile input.
The systems and techniques described here can be implemented in a computing system that includes a back-end component (e.g., as a data server), or that includes a middleware component (e.g., an application server), or that includes a front-end component (e.g., a user computer having a graphical user interface or a web browser through which a user can interact with an implementation of the systems and techniques described here), or any combination of such back-end, middleware, or front-end components. The components of the system can be interconnected by any form or medium of digital data communication (e.g., a communication network). Examples of communication networks include: local Area Networks (LANs), wide Area Networks (WANs), blockchain networks, and the internet.
The computing system may include clients and servers. A client and server are generally remote from each other and typically interact through a communication network. The relationship of client and server arises by virtue of computer programs running on the respective computers and having a client-server relationship to each other. The server can be a cloud server, also called a cloud computing server or a cloud host, and is a host product in a cloud computing service system, so that the defects of high management difficulty and weak service expansibility in the traditional physical host and VPS service are overcome.
It should be understood that various forms of the flows shown above, reordering, adding or deleting steps, may be used. For example, the steps described in the present invention may be executed in parallel, sequentially, or in different orders, and are not limited herein as long as the desired results of the technical solution of the present invention can be achieved.
The above-described embodiments should not be construed as limiting the scope of the invention. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions may be made, depending on design requirements and other factors. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. An acquisition method of a video privacy zone, which is executed by a client having a viewing right of the video privacy zone, the method comprising:
if the privacy zone acquisition message sent by the server is determined to be received, determining at least one target multicast group according to the privacy zone acquisition message;
sending a target multicast group joining message to a gateway router to join a target multicast group, wherein a target local area network address in the target multicast group joining message is a unicast local area network address matched with the gateway router;
and if the fact that at least one target multicast group video stream sent by the gateway router is received is determined, acquiring a video privacy area according to the target multicast group video stream, and obtaining a plaintext video according to the video privacy area and each frame of video frame image after scrambling.
2. The method of claim 1, wherein sending the target multicast group join message to the gateway router comprises:
determining a unicast local area network address matched with the gateway router according to a locally stored address resolution protocol table;
and taking the unicast local area network address as a destination local area network address of the target multicast group adding message, and sending the target multicast group adding message to the gateway router.
3. The method of claim 1, wherein the target multicast group video stream is obtained by encoding a privacy zone of each frame of video frame image by a camera;
after acquiring the video privacy zone according to the target multicast group video stream, the method further comprises the following steps:
determining the relative position relation between the privacy area of each frame of video frame image and each frame of video frame image according to the message encapsulation field of the target multicast group video stream;
and merging the scrambled video frame images and the privacy areas of the video frame images according to the relative position relation between the privacy areas of the video frame images and the video frame images to obtain the descrambled video frame images.
4. A method for transmitting a video privacy zone, performed by a gateway router, the method comprising:
receiving at least one target multicast group join message through a target interface;
if the destination local area network address of the target multicast group join message is determined to be a unicast local area network address matched with the gateway router, determining at least one source internet protocol address according to the target multicast group join message, wherein the source internet protocol address is a unicast internet protocol address;
and sending the target multicast group video stream to the client matched with the source Internet protocol address in a unicast video stream mode through a target interface.
5. The method of claim 4, wherein after determining at least one source Internet protocol address based on the target multicast group join message, further comprising:
registering the source internet protocol address on a target interface of a multicast forwarding table item;
and sending the target multicast group joining message to an upstream router, and receiving the target multicast group video stream sent by the upstream router.
6. The method of claim 4, further comprising:
sending the video stream of the scrambled multicast group to the scrambled multicast group in the form of a multicast video stream through a scrambled video sending interface so as to enable the scrambled multicast group to multicast the video stream of the scrambled multicast group;
the scrambled multicast group video stream comprises frames of video frame images after scrambling, and the scrambled multicast group is different from the target multicast group.
7. An apparatus for acquiring a video privacy zone, the apparatus being configured to a client having a viewing right of the video privacy zone, the apparatus comprising:
the target multicast group determining module is used for determining at least one target multicast group according to the privacy zone acquisition message if the privacy zone acquisition message sent by the server is determined to be received;
a join message sending module, configured to send a target multicast group join message to a gateway router to join a target multicast group, where a destination local area network address in the target multicast group join message is a unicast local area network address matched with the gateway router;
and the privacy area acquisition module is used for acquiring a video privacy area according to the target multicast group video stream if at least one target multicast group video stream sent by the gateway router is determined to be received, so as to obtain a plaintext video according to the video privacy area and each scrambled frame video frame image.
8. An apparatus for transmitting a video privacy zone, the apparatus being configured at a gateway router, the apparatus comprising:
the joining message receiving module is used for receiving at least one target multicast group joining message through a target interface;
a protocol address determining module, configured to determine at least one source internet protocol address according to the target multicast group join message if it is determined that a destination lan address of the target multicast group join message is a unicast lan address matching the gateway router, where the source internet protocol address is a unicast internet protocol address;
and the video stream sending module is used for sending the target multicast group video stream to the client matched with the source Internet protocol address in a unicast video stream mode through the target interface.
9. An electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, wherein the processor implements the method for acquiring a video privacy zone as claimed in any one of claims 1 to 3 or the method for transmitting a video privacy zone as claimed in any one of claims 4 to 6 when executing the program.
10. A storage medium storing computer-executable instructions, which when executed by a computer processor, are configured to perform the method of acquiring a video privacy zone according to any one of claims 1 to 3 or the method of transmitting a video privacy zone according to any one of claims 4 to 6.
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