CN115396742A - Video watermark superposition method and device, computer equipment and storage medium - Google Patents
Video watermark superposition method and device, computer equipment and storage medium Download PDFInfo
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- CN115396742A CN115396742A CN202210810040.7A CN202210810040A CN115396742A CN 115396742 A CN115396742 A CN 115396742A CN 202210810040 A CN202210810040 A CN 202210810040A CN 115396742 A CN115396742 A CN 115396742A
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- 238000000034 method Methods 0.000 title claims abstract description 212
- 230000006870 function Effects 0.000 claims description 35
- 238000004590 computer program Methods 0.000 claims description 14
- 238000012545 processing Methods 0.000 abstract description 2
- 230000005540 biological transmission Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 5
- 238000009877 rendering Methods 0.000 description 5
- 230000004083 survival effect Effects 0.000 description 3
- 238000004891 communication Methods 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- 238000001514 detection method Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
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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
- H04N21/83—Generation or processing of protective or descriptive data associated with content; Content structuring
- H04N21/835—Generation of protective data, e.g. certificates
- H04N21/8358—Generation of protective data, e.g. certificates involving watermark
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/76—Television signal recording
- H04N5/91—Television signal processing therefor
- H04N5/913—Television signal processing therefor for scrambling ; for copy protection
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/76—Television signal recording
- H04N5/91—Television signal processing therefor
- H04N5/913—Television signal processing therefor for scrambling ; for copy protection
- H04N2005/91307—Television signal processing therefor for scrambling ; for copy protection by adding a copy protection signal to the video signal
- H04N2005/91335—Television signal processing therefor for scrambling ; for copy protection by adding a copy protection signal to the video signal the copy protection signal being a watermark
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Abstract
The present application relates to the field of video processing, and in particular, to a method, an apparatus, a computer device and a storage medium for video watermark superposition, including: executing a first process to set watermark information, and writing the watermark information into a shared memory; executing a second process to read the watermark information from the shared memory and decode the acquired video stream; and executing a third process to overlay the watermark information and the decoded video stream. The invention executes the first process, the second process and the third process which are independent of each other to realize the superposition of the watermark information and the video stream.
Description
Technical Field
The present application relates to the field of video processing, and in particular, to a method and an apparatus for superimposing a video watermark, a computer device, and a storage medium.
Background
In order to solve the memory bottleneck caused by service expansion and the problem of program stability caused by video streaming, video decoding and video drawing, the client of the security video monitoring platform peels the video decoding and video drawing processes into independent processes, namely, the original single-process mode is adjusted into a multi-process mode. However, after the multi-process mode is adopted, the decoding process and the main process are isolated from each other and have independent address spaces and thread kernel objects, so that the callback function cannot be directly called to obtain the watermark information during decoding.
Disclosure of Invention
In view of the foregoing, it is necessary to provide a video watermark superimposing method, apparatus, computer device and storage medium.
In a first aspect, an embodiment of the present invention provides a video watermark superimposing method, where the method includes:
executing a first process to set watermark information, and writing the watermark information into a shared memory;
executing a second process to read the watermark information from the shared memory and decode the acquired video stream;
and executing a third process to overlap the watermark information with the decoded video stream.
In an embodiment, the executing the first process to set the watermark information includes:
and executing a first process to call a watermark information setting function of the link library, and setting watermark information by using the watermark information setting function.
In an embodiment, the executing the second process to read the watermark information from the shared memory includes:
and executing a second process to call a watermark information acquisition function of the link library, and reading the watermark information from the shared memory by using the watermark information acquisition function.
In an embodiment, said performing the third process to superimpose the watermark information on the decoded video stream comprises:
and executing a third process to call a watermark information drawing function of the link library, and superposing the watermark information and the decoded video stream by using the watermark information drawing function.
In an embodiment, the method further comprises:
executing the first process to write the video stream into a shared memory;
and executing the second process to read the video stream from the shared memory.
In an embodiment, the method further comprises:
and after the first process and the second process are started, loading the link library to obtain a function pointer.
In an embodiment, the method further comprises:
and executing a fourth process to detect whether the second process is alive, and if not, executing the first process to reestablish the second process.
In a second aspect, an embodiment of the present invention provides a video watermark superimposing apparatus, where the apparatus includes:
the first execution module is used for executing a first process to set watermark information and writing the watermark information into the shared memory;
a second execution module, configured to execute a second process to read the watermark information from the shared memory and decode the acquired video stream;
and the third execution module is used for executing a third process to overlay the watermark information and the decoded video stream.
In a third aspect, an embodiment of the present invention provides a computer device, including a memory and a processor, where the memory stores a computer program, and the processor executes the steps in the first aspect.
In a fourth aspect, an embodiment of the present invention provides a computer-readable storage medium, on which a computer program is stored, and the processor implements the steps of the first aspect when executing the computer program.
Compared with the prior art, the method, the device, the computer equipment and the storage medium execute the first process to set the watermark information, write the watermark information into the shared memory, execute the second process to read the watermark information from the shared memory and decode the acquired video stream, and execute the third process to overlay the watermark information and the decoded video stream. Compared with the prior art, the method realizes the transmission of the watermark information between the first process and the second process by using a memory sharing mode, and executes the first process, the second process and the third process which are independent of each other to realize the superposition of the watermark information and the video stream.
Drawings
Fig. 1 is a schematic structural diagram of an application environment of a video watermark overlaying method in an embodiment;
FIG. 2 is a flowchart illustrating a video watermark overlaying method according to an embodiment;
fig. 3 is a schematic flowchart of a video watermark superimposing method in another embodiment;
FIG. 4 is a schematic overall flowchart of a video watermark superposition method according to an embodiment;
FIG. 5 is a block diagram illustrating the connection of video watermark superimposing apparatuses according to an embodiment;
FIG. 6 is a block diagram of a computer device in an embodiment.
Detailed Description
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly described below. It is obvious that the drawings in the following description are only examples or embodiments of the invention, and that for a person skilled in the art it is possible to apply the invention to other similar contexts without inventive step on the basis of these drawings. Unless otherwise apparent from the context, or otherwise indicated, like reference numbers in the figures refer to the same structure or operation.
As used in this disclosure and in the claims, the terms "a," "an," "the," and/or "the" are not intended to be inclusive in the singular, but rather are inclusive in the plural, unless the context clearly dictates otherwise. In general, the terms "comprises" and "comprising" are intended to cover only the explicitly identified steps or elements as not constituting an exclusive list and that the method or apparatus may comprise further steps or elements.
Although the present invention makes various references to certain modules in a system according to embodiments of the present invention, any number of different modules may be used and run on a computing device and/or processor. The modules are merely illustrative and different aspects of the systems and methods may use different modules.
It will be understood that when an element or module is referred to as being "connected," "coupled" to other elements, modules or blocks, it can be directly connected or coupled or in communication with the other elements, modules or blocks or intervening elements, modules or blocks may be present unless the context clearly dictates otherwise. As used herein, the term "and/or" can include any and all combinations of one or more of the associated listed items.
The video watermark superposition method provided by the application can be applied to the application environment shown in fig. 1. Wherein the terminal 102 communicates with the server 104 via a network. The terminal 102 executes a first process to set watermark information, writes the watermark information and a video stream acquired from the server 104 into a shared memory, executes a second process to read the watermark information from the shared memory and decode the video stream acquired from the shared memory, executes a third process to superimpose the watermark information and the decoded video stream, and the superimposed video stream can be played by executing the second process.
The terminals 30 include, but are not limited to: a camera, a terminal, a mobile terminal, a PC, a server, an in-vehicle device, an entertainment device, an advertising device, a Personal Digital Assistant (PDA), a tablet computer, a laptop computer, a handheld game console, smart glasses, a smart watch, a wearable device, a virtual display device, a display enhancement device, or the like.
The network may be or include a public network (e.g., the internet), a private network (e.g., a Local Area Network (LAN)), a wired network, a wireless network (e.g., an 802.11 network, a Wi-Fi network), a frame relay network, a Virtual Private Network (VPN), a satellite network, a telephone network, a router, a hub, a switch, a server computer, and/or any combination thereof. For example, the network may include a cable network, a wireline network, a fiber optic network, a telecommunications network, an intranet, a Wireless Local Area Network (WLAN), a Metropolitan Area Network (MAN), a Public Switched Telephone Network (PSTN), a bluetooth network, a ZigBee network, a Near Field Communication (NFC) network, and the like, or any combination thereof. In some embodiments, the network may include one or more network access points. For example, the network may include wired and/or wireless network access points such as base stations and/or internet switching points.
In an embodiment, as shown in fig. 2, a video watermark overlaying method is provided, which is described by taking the application environment in fig. 1 as an example, and includes the following steps:
s201: and executing a first process to set watermark information and writing the watermark information into the shared memory.
In this embodiment, the first process refers to a decoding and playing main process, and the first process is mainly used for setting watermark information.
Specifically, a first process is executed to call a watermark information setting function of the link library, and the watermark information setting function is used to set watermark information and write the watermark information into the shared memory.
In this embodiment, although the first process, the second process, and the third process are independent processes, data transmission may be implemented in a memory sharing manner.
S202: and executing a second process to read the watermark information from the shared memory and decode the acquired video stream.
In this embodiment, the second process refers to a decoding and playing sub-process, and the second process is mainly used for reading watermark information, decoding a video stream, and playing the video stream after the watermark information is superimposed.
Specifically, a second process is executed to call a watermark information obtaining function of the link library, and the watermark information is read from the shared memory by using the watermark information obtaining function.
S203: and executing a third process to overlay the watermark information and the decoded video stream.
In this embodiment, the third process refers to a video rendering thread, and the third process is mainly used for superimposing the watermark information on the decoded video stream.
Specifically, a third process is executed to call a watermark information rendering function of the link library, and the watermark information is superimposed on the decoded video stream by using the watermark information rendering function.
The superimposed video stream can be played in a designated window by executing a second process.
Based on the above steps S201 to S203, a first process is executed to set watermark information, the watermark information is written into a shared memory, a second process is executed to read the watermark information from the shared memory and decode the acquired video stream, and a third process is executed to superimpose the watermark information and the decoded video stream. Compared with the prior art, the method realizes the transmission of the watermark information between the first process and the second process by using a memory sharing mode, and executes the first process, the second process and the third process which are independent of each other to realize the superposition of the watermark information and the video stream.
In an embodiment, in addition to the transfer of watermark information between the first process and the second process by using the shared memory, the transfer of a video stream may also be implemented.
And executing the first process to receive the coded video stream from the network server, writing the video stream into the shared memory, and executing the second process to read the video stream from the shared memory, thereby realizing the transmission of the video stream.
In an embodiment, after the first process and the second process are started, the loading link library obtains a function pointer, so that the watermark information setting function and the watermark information obtaining function can be called based on the function pointer.
In one embodiment, as shown in fig. 3, the method of the present invention further comprises the steps of:
s204: and executing a fourth process to detect whether the second process is alive, and if not, executing the first process to reestablish the second process.
The fourth process is referred to as the watchdog sub-process. The first process creates a watchdog subprocess, after the watchdog subprocess is started, a timer is started, the survival state of the second process is detected, and the first process is executed to re-create the second process under the condition of non-survival, so that the superposition failure of watermark information or the playing failure of video streams and the like are avoided, the video playing stability is further improved, and the user experience is improved.
When the first process exits, the second process and the fourth process need to be destroyed first, so that zombie processes are avoided.
The overall flow chart of the video watermark superposition method is shown in fig. 4, and the method comprises the steps of starting a first process, loading a link library, executing the first process to create a fourth process, starting a timer after the fourth process is started, detecting the survival state of a second process, executing the first process to create the second process, and preposing the creation process of the second process, so that the problem of video playing delay caused by dynamically creating the processes when playing is needed is avoided. When a second process is started, a link library is loaded to obtain a function pointer, a first process is executed to start playing a channel video on a certain window, a playing window handle is set to the second process, meanwhile, a watermark information setting function is called to set watermark information, the first process is executed to send a video stream received on a server to the second process, the second process is executed to decode the received video stream, a third process is executed to render the decoded video stream onto a designated window, the second process is executed to call a watermark information obtaining function of the link library, watermark information is read from the shared memory, the third process is executed to superpose the watermark information and the decoded video stream, a fourth process is executed to detect whether the second process is alive or not, if yes, the first process exits, the second process and the fourth process are destroyed, and if not, the first process is informed to recreate the second process.
In one embodiment, as shown in fig. 5, the present invention provides a video watermark superimposing apparatus, including:
a first executing module 501, configured to execute a first process to set watermark information, and write the watermark information into a shared memory;
a second executing module 502, configured to execute a second process to read the watermark information from the shared memory and decode the obtained video stream;
a third executing module 503, configured to execute a third process to overlay the watermark information with the decoded video stream.
In this embodiment, a first execution module is used to execute a first process to set watermark information and write the watermark information into a shared memory, a second execution module executes a second process to read the watermark information from the shared memory and decode an acquired video stream, and a third execution module executes a third process to superimpose the watermark information and the decoded video stream. Compared with the prior art, the method realizes the transmission of the watermark information between the first process and the second process by using a memory sharing mode, and executes the first process, the second process and the third process which are independent of each other to realize the superposition of the watermark information and the video stream.
In one embodiment, the first execution module executes the first process to call a watermark information setting function of the link library, and sets the watermark information by using the watermark information setting function.
In an embodiment, the second execution module executes a watermark information obtaining function of the second process calling the link library, and reads the watermark information from the shared memory by using the watermark information obtaining function.
In an embodiment, the third execution module executes a third process to call a watermark information rendering function of the link library, and superimposes the watermark information and the decoded video stream by using the watermark information rendering function.
In one embodiment, the first execution module executes the first process to write the video stream into the shared memory; and the second execution module executes the second process to read the video stream from the shared memory.
In one embodiment, the load-linked library obtains the function pointer after the first process and the second process are started.
In one embodiment, the method further comprises:
and the fourth execution module is used for executing a fourth process to detect whether the second process is alive or not, and if not, executing the first process to reestablish the second process.
For specific limitations of the video watermark superimposing apparatus, reference may be made to the above limitations of the video watermark superimposing method, and details thereof are not repeated here. The modules in the video watermarking superimposing apparatus can be implemented in whole or in part by software, hardware, and a combination thereof. The modules can be embedded in a hardware form or independent from a processor in the computer device, and can also be stored in a memory in the computer device in a software form, so that the processor can call and execute operations corresponding to the modules.
In one embodiment, a computer device is provided, which may be a server, and its internal structure diagram may be as shown in fig. 6. The computer device includes a processor, a memory, and a network interface connected by a system bus. Wherein the processor of the computer device is configured to provide computing and control capabilities. The memory of the computer device comprises a nonvolatile storage medium and an internal memory. The non-volatile storage medium stores an operating system, a computer program, and a database. The internal memory provides an environment for the operation of an operating system and computer programs in the non-volatile storage medium. The database of the computer device is used for storing motion detection data. The network interface of the computer device is used for communicating with an external terminal through a network connection. The computer program is executed by a processor to implement the steps in any of the above embodiments of the video watermarking method.
Specifically, the video watermark superimposing method comprises the following steps:
executing a first process to set watermark information, and writing the watermark information into a shared memory;
executing a second process to read the watermark information from the shared memory and decode the acquired video stream;
and executing a third process to overlay the watermark information and the decoded video stream.
Those skilled in the art will appreciate that the architecture shown in fig. 6 is merely a block diagram of some of the structures associated with the disclosed aspects and is not intended to limit the computing devices to which the disclosed aspects apply, as particular computing devices may include more or less components than those shown, or may combine certain components, or have a different arrangement of components.
In one embodiment, a computer device is provided, which includes a memory and a processor, the memory stores a computer program, and the processor implements the steps of any one of the above embodiments of the video watermark superimposing method when executing the computer program.
Specifically, the video watermark superimposing method includes the following steps:
executing a first process to set watermark information, and writing the watermark information into a shared memory;
executing a second process to read the watermark information from the shared memory and decode the acquired video stream;
and executing a third process to overlap the watermark information with the decoded video stream.
In an embodiment, a computer-readable storage medium is provided, on which a computer program is stored, which computer program, when executed by a processor, implements the steps in any of the above embodiments of the video watermarking method.
It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by hardware related to instructions of a computer program, which can be stored in a non-volatile computer-readable storage medium, and when executed, can include the processes of the embodiments of the methods described above. Any reference to memory, storage, database or other medium used in the embodiments provided herein can include at least one of non-volatile and volatile memory. Non-volatile memory may include Read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical storage, or the like. Volatile memory can include Random Access Memory (RAM) or external cache memory. By way of illustration and not limitation, RAM can take many forms, such as Static Random Access Memory (SRAM) or Dynamic Random Access Memory (DRAM), among others.
The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above examples only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent application shall be subject to the appended claims.
Claims (10)
1. A method for video watermarking, the method comprising:
executing a first process to set watermark information, and writing the watermark information into a shared memory;
executing a second process to read the watermark information from the shared memory and decode the acquired video stream;
and executing a third process to overlay the watermark information and the decoded video stream.
2. The method of claim 1, wherein the executing the first process to set the watermark information comprises:
and executing a first process to call a watermark information setting function of the link library, and setting watermark information by using the watermark information setting function.
3. The method of claim 1, wherein the executing the second process to read the watermark information from the shared memory comprises:
and executing a second process to call a watermark information acquisition function of the link library, and reading the watermark information from the shared memory by using the watermark information acquisition function.
4. The method of claim 1, wherein the performing the third process to superimpose the watermark information with the decoded video stream comprises:
and executing a third process to call a watermark information drawing function of the link library, and superposing the watermark information and the decoded video stream by using the watermark information drawing function.
5. The method of claim 1, further comprising:
executing the first process to write the video stream into a shared memory;
and executing the second process to read the video stream from the shared memory.
6. The method of claim 1, further comprising:
and after the first process and the second process are started, loading the link library to obtain a function pointer.
7. The method of claim 1, further comprising:
and executing a fourth process to detect whether the second process is alive, and if not, executing the first process to reestablish the second process.
8. A video watermark superimposing apparatus, characterized in that the apparatus comprises:
the first execution module is used for executing the first process to set the watermark information and writing the watermark information into the shared memory;
a second execution module, configured to execute a second process to read the watermark information from the shared memory and decode the acquired video stream;
and the third execution module is used for executing a third process to overlay the watermark information and the decoded video stream.
9. A computer device comprising a memory and a processor, the memory storing a computer program, characterized in that the processor, when executing the computer program, implements the steps of the method of any one of claims 1 to 7.
10. A computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, carries out the steps of the method of any one of claims 1 to 7.
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