WO2018152953A1

WO2018152953A1 - Method and apparatus for processing video data, and computer storage medium

Info

Publication number: WO2018152953A1
Application number: PCT/CN2017/081923
Authority: WO
Inventors: 唐红博; 朱海涛; 蒋宗文; 郭军
Original assignee: 东方网力科技股份有限公司
Priority date: 2017-02-27
Filing date: 2017-04-25
Publication date: 2018-08-30
Also published as: CN106851206A

Abstract

Provided are a method and apparatus for processing video data, and a computer storage medium, wherein the method comprises: receiving a video request instruction, of a first external device, for video data; according to the video request instruction, reading corresponding video data from a second external device, and processing the video data so as to obtain video data to be played; and transmitting, to the first external device, the video data to be played.

Description

Video data processing method and device, computer storage medium

Cross-reference to related applications

The present application is based on a Chinese patent application filed on Jan. 27, 2017, the entire disclosure of which is hereby incorporated by reference.

Technical field

The present invention relates to the field of analog/digital video processing technologies, and in particular, to a video data processing method and apparatus, and a computer storage medium.

Background technique

In the domestic and international surveillance market, there are a large number of analog devices, digital devices and other monitoring platforms of different types and manufacturers. These devices need to communicate through different protocols, especially in large-scale network video surveillance systems. Due to the inherent limitations of the original video surveillance platform, it can only be repaired by the original manufacturer when responding to the needs of new services. This method seriously affects the stability and reliability of the system. In order to maintain the stability of the system, some performance detection systems have been developed. These systems additionally increase the load on the original system, causing new instability factors. The vicious cycle of pollution eventually led to the collapse of the entire system, the business stopped, and chaos. In addition, most platforms lack scalability, can not cope with the rapid expansion of front-end monitoring points, and lack of certain openness. For heterogeneous systems or devices, they cannot be expanded at will, and platforms cannot be quickly cascaded and analog devices and digital devices. It also cannot be mixed seamlessly.

Summary of the invention

In view of this, an object of the present invention is to provide a video data processing method and apparatus, Try to solve or at least alleviate the problems that exist above.

In a first aspect, the present invention provides a video data processing method, including:

Receiving a video request instruction of the first external device for the video data;

Obtaining corresponding video data from the second external device according to the video request instruction, and processing the video data to obtain video data to be played;

Transmitting the to-be-played video data to the first external device.

Optionally, in the method according to the present invention, the video data includes at least analog video data, the video request instruction includes a digital control signal, and the to-be-played video data includes digital video data to be played, according to the The video request instruction reads the corresponding video data from the second external device, and processes the video data to obtain the video data to be played, including:

And reading the analog video data from the second external device according to the digital control signal, and processing the analog video data to obtain the digital video data to be played.

Optionally, in the method according to the present invention, the analog video data comprises an analog video signal, the analog video data being read from the second external device according to the digital control signal, The analog video data is processed to obtain the digital video data to be played, including:

After reading the analog video data from the second external device according to the digital control signal, sampling the analog video signal;

Quantifying the sampled analog video signal;

The quantized analog video signal is encoded to obtain digital video data to be played.

Optionally, in the method according to the present invention, the analog video signal comprises a luminance signal, and the encoding the quantized analog video signal comprises:

Sampling the luminance signal in the read digital video data;

Filtering the sampled luminance signal;

Adding a blanking substrate to the filtered luminance signal, adding to the blanking control signal The amplitude of the luminance signal after the blanking substrate is added is adjusted, and then the amplitude-adjusted luminance signal is inserted into the digital composite synchronization signal, and the digital control signal includes a blanking control signal and a digital composite synchronization signal.

Optionally, in the method according to the present invention, the video data includes at least digital video data, the video request instruction includes an on-demand request instruction and a decoding instruction, and the to-be-played video data includes analog video data to be played, Obtaining corresponding video data from the second external device according to the video request instruction, and processing the video data to obtain video data to be played, including:

And reading the digital video data from the second external device according to the on-demand request instruction, and decoding the digital video data according to the decoding instruction to obtain the analog video data to be played.

In a second aspect, an embodiment of the present application provides a video data processing apparatus, including:

a receiving unit, configured to receive a video request instruction of the first external device for the video data;

a processing unit, configured to read corresponding video data from the second external device according to the video request instruction, and process the video data to obtain video data to be played;

And a transmission unit, configured to transmit the video data to be played to the first external device.

Optionally, in the apparatus according to the present invention, the video data includes at least analog video data, the video request instruction includes a digital control signal, the to-be-played video data includes digital video data to be played, and the processing unit further Used for:

Optionally, in the device according to the invention, the analog video data comprises an analog video signal, and the processing unit is further configured to:

Quantifying the sampled analog video signal;

Optionally, in the device according to the invention, the analog video signal comprises a luminance signal, and the processing unit is further configured to:

Sampling the luminance signal in the read digital video data;

Filtering the sampled luminance signal;

Adding a blanking substrate to the filtered luminance signal, adjusting the amplitude of the luminance signal after adding the blanking substrate according to the blanking control signal, and then inserting the digital composite synchronization signal into the amplitude-adjusted luminance signal, the digital control The signal includes a blanking control signal and a digital composite sync signal.

Optionally, in the apparatus according to the present invention, the video data includes at least digital video data, the video request instruction includes an on-demand request instruction and a decoding instruction, and the to-be-played video data includes analog video data to be played, The processing unit is also used to:

In a third aspect, an embodiment of the present application provides a computer readable storage medium having stored thereon a computer program, wherein the computer program is executed by a processor to implement the steps of the foregoing method.

According to the technical solution of the present invention, mutual conversion of analog video signals and digital video signals is realized, which is easier in the development process, and the function integration is relatively simple, and can quickly access any video terminal or device (smart glasses, mobile terminal, each Various types of video equipment terminals, etc.), compatible with various heterogeneous platforms, to achieve seamless expansion.

The above described objects, features and advantages of the present invention will become more apparent from the aspects of the appended claims.

DRAWINGS

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the embodiments will be briefly described below. It should be understood that the following drawings show only certain embodiments of the present invention, and therefore It should be seen as a limitation on the scope, and those skilled in the art can obtain other related drawings according to these drawings without any creative work.

FIG. 1 is a flowchart of a video data processing method according to an embodiment of the present invention;

FIG. 2 is a schematic diagram showing conversion of a digital video signal to an analog video signal according to an embodiment of the present invention; FIG.

FIG. 3 is a schematic diagram showing conversion of an analog video signal to a digital video signal according to an embodiment of the present invention; FIG.

FIG. 4 is a structural diagram of a video data processing apparatus according to an embodiment of the present invention;

FIG. 5 is a schematic diagram of an analog device component middleware provided by an embodiment of the present invention; FIG.

6 is a schematic diagram of a digital device component middleware provided by an embodiment of the present invention;

FIG. 7 is a schematic diagram of a video stream definition provided by an embodiment of the present invention.

detailed description

The technical solutions in the embodiments of the present invention are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present invention. It is a partial embodiment of the invention, and not all of the embodiments. The components of the embodiments of the invention, which are generally described and illustrated in the figures herein, may be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the invention in the claims All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.

FIG. 1 is a flowchart of a video data processing method according to an embodiment of the present invention. As shown in FIG. 1, the method begins in step S110.

In step S110, a video request instruction of the first external device to the video data is received. The first external device may be, but not limited to, a monitor, a camera, a DVR, an IP camera, etc., and the video data transmitted by the first external device generally includes analog video data and digital video data, and the present invention does not impose any limitation.

In step S120, according to the video request instruction, the corresponding video data is read from the second external device, and the video data is processed to obtain the video data to be played.

Since the data transmitted by the first external device may be analog video data or digital video data, the video data is processed by different video request instructions for different video data, which is described by the following embodiments.

In an embodiment, when the video data is analog video data, the video request instruction includes a digital control signal, and the to-be-played video data includes digital video data to be played, and the analog video is read from the second external device according to the digital control signal. Data, processing the analog video data to obtain digital video data to be played. The second external device may be, but not limited to, a monitor, a camera, a DVR, an IP camera, etc., and the present invention does not impose any limitation.

The analog video data includes an analog video signal, after the analog video data is read from the second external device according to the digital control signal, the analog video signal is sampled; the sampled analog video signal is quantized; and the quantized analog video signal is compared Encoding, obtaining digital video data to be played, and transmitting digital video data to be played in different encoding formats through different transmission protocols, for example, transmitting different encoding formats (such as MPEG1) on the network through transmission protocols such as NPS, TS over UDP, and RTP. Audio and video data of MPEG2, MPEG4, H.264, etc.).

For example, referring to FIG. 2, the call of the video in the public security system is taken as an example. The police station in each area may use a monitor to monitor the condition of the cell or the road, and the public security center may use an IP camera to monitor the surrounding situation. The video data obtained by the local police station is generally analog video data, and the user receives the input instruction through the control keyboard, and the video matrix host receives the analog video, and the management server controls the video matrix host to simulate the video number after receiving the instruction input by the user. According to the transmission to the data processing platform, the video matrix host can also transmit the analog video data to the monitor for the corresponding staff to view.

The video data obtained by the public security center is generally digital video data. Since the original digital video data is relatively large, it needs to be encoded by the encoder, and the encoded digital video data is stored in the management center, and the control keyboard of the public security center receives the user input. The instruction, the management center decodes the stored digital video data according to the instruction input by the user, and sends it to the corresponding monitor for the staff to view.

When the public security center wants to view the video data of a police station, the public security center sends a video request command to the video data processing platform, and the platform acquires the analog video data of a police station according to the video request instruction, and the platform simulates the above through the video conversion module and the encoder. The video data is processed, for example, by converting the above analog video data signal into a digital video data signal and outputting the digital video data signal to the public security center, and the public security center decodes and views.

When the analog video signal is encoded, an analog video signal such as a luminance signal and a chrominance signal in the analog video signal may be encoded. Hereinafter, the luminance signal and the chrominance signal are respectively taken as an example for description.

When encoding the quantized analog video signal, sampling the luminance signal in the read digital video data; filtering the sampled luminance signal; adding a blanking basis to the filtered luminance signal, according to The blanking control signal adjusts the amplitude of the luminance signal after adding the blanking substrate, and then inserts the digital composite synchronization signal into the amplitude-adjusted luminance signal, and the digital control signal includes a blanking control signal and a digital composite synchronization signal.

For example, the luminance signal read by the read data controller is double-oversampled by the brightness double oversampler, and the twice-oversampled luminance signal is low-pass filtered by the over-sampling luminance low-pass filter, and the low pass is passed. The bandwidth of the filtered luminance signal is reduced, which is more conducive to the decoding of subsequent decoders. The blanking substrate is added to the twice-oversampled luminance signal by the first adder. The blanking signal generated by the first multiplier according to the video timing generator is blanked up/down Under the control of the expander, the amplitude of the luminance signal after adding the blanking substrate is adjusted. A digital composite sync signal is added to the amplitude-adjusted luminance signal by a second adder under the control of a synchronous up-down expander, the digital composite sync signal being generated by a timing generator.

The luminance low-pass filter and the over-sampling luminance low-pass filter may be FIR filters, and may be other devices for implementing low-pass filtering, which is not specifically limited in the present invention. The above various adders and multipliers can be implemented by using logic gates, and the present invention does not impose any limitation.

When encoding the chrominance signal in the quantized analog video signal, filtering the chrominance signal in the read digital video data; interpolating the filtered chrominance signal; and interpolating the chrominance A color burst signal is inserted into the signal; the chrominance signal inserted into the color burst signal is sampled; the sampled chrominance signal is modulated; and the modulated chrominance signal is filtered.

For example, the chrominance signal read by the read data controller is double-oversampled by the chrominance twice oversampler, and the chrominance low pass filter is used to double the oversampled chrominance signal after oversampling. Through filtering, the color burst signal is inserted into the low-pass filtered chrominance signal by the multiplexer under the control of the color burst signal controller, and the chrominance signal of the inserted color burst signal is modulated by the modulator, and the second multiplication method is performed. The amplitude of the modulated chrominance signal is adjusted under the control of the blanking rise/fall expander according to the blanking control signal (including the blanking control signal in the digital control signal). The chrominance signal modulated by the third adder and the luminance signal added to the digital composite sync signal are added.

In one embodiment, the video data includes digital video data, the video request instruction includes an on-demand request instruction and a decoding instruction, and the to-be-played video data includes analog video data to be played, and the number is read from the second external device according to the on-demand request instruction. The video data is decoded according to the decoding instruction to obtain analog video data to be played.

For example, referring to FIG. 3, the call of the video in the public security system is also taken as an example. When a police station wants to view the video data of the public security center, it is input through the control keyboard of the police station. The on-demand request instruction, after receiving the above-mentioned request for on-demand request, the video data processing platform obtains the corresponding digital analog video from the public security center, and the platform decodes the digital analog video through the digital-to-analog conversion module and the decoder to obtain the analog video data to be played. The analog video data to be played is transmitted to the management center of the corresponding police station for viewing by relevant personnel.

In step S130, the video data to be played is transmitted to the first external device.

The invention combines digital video and analog video organically to form a new generation network video system with convenient resource sharing and convenient interconnection control. In addition, the present invention can also complete powerful functions such as video capture, compression, transmission, control, storage, retrieval, playback, remote network access, and network download. It allows many users and operators located in different locations to flexibly apply all resources shared in the system according to their permissions.

According to the technical solution of the present invention, mutual conversion of analog video signals and digital video signals is realized, which is easier in the development process, and the function integration is relatively simple, and can quickly access any video terminal or device and be compatible with various heterogeneous platforms. Achieve seamless expansion.

In order to enhance the openness and flexibility of the system, the video processing apparatus of the present invention adopts the idea of component middleware in supporting various types of video matrix and control keyboard, and the middleware of the device includes a middle of a device component and a digital device component. Pieces. A hardware abstraction layer "unified device control interface layer" is set up between the actual device control and the upper layer application to isolate the specificity of the specific device and define a unified device control interface.

The structure diagram of the analog device component middleware can be referred to FIG. 5. The bottom layer is the driver support API layer, typically such as a serial port, which is responsible for transmitting device control signals to or from the physical device to the upper layer, and Provides basic, portable support for upper-level driver development.

Above the driver support API layer are specific device driver layers, such as video switching matrix, control keyboard, pan/tilt drive, and so on. This layer is responsible for translating the standard control signals (matrix image switching) from the upper layer into specific device control signals and transmitting them, or translating the information acquired from the specific device into standard device input information (such as alarm signals) and sending them to the upper layer. .

Above the specific device driver layer is the analog device component middleware (unified device control interface layer). This layer is mainly responsible for device creation, deletion, signal distribution and acquisition, and provides a unified programming interface for the upper layer.

The top layer is the analog device control service layer. This layer is responsible for distributing the device control signals from the client to the specific device driver through the lower layer, or distributing the signals of the specific device driver layer from the lower layer to the client (possibly one signal will be sent to multiple clients), explaining and processing accordingly. Agreement.

Analog device component middleware provides a consistent set of programming interfaces to provide unified device control interface services for specific device drivers. Each device has a property called the device model, and the unified device control interface finds the driver for that device through this model. The device model is a 32-bit value, the upper 8 bits indicate the type of drive (see table below), and the lower 24 bits are determined by the driver writer, but different drivers must have different device models (eg, 16-digit manufacturer number plus 8-bit product) Number composition).

The interface of the analog device component middleware is defined as follows:

Typedef unsigned long TDevClass;//Model of the device

Typedef void*HDevObj;//device instance handle

//The callback function prototype when the FDevCallback device data arrives

//Input parameters:

//parm—sets the parameters set during callback

//data—data arriving on the device

//len—data length

/ / Return value: 0 - correct; <0 - error number; > 0 - prohibit

Typedef int(*FDevCallback)(void*parm,void*data,int len);

The above definition of the analog device component middleware interface is merely illustrative, and the invention is not limited thereto.

In the new access to a specific device driver, you need to define a model code (unique), in addition to the five functions defined above: DevCreate, DevDelete, DevWrite, DevSetCallback, DevControl, to facilitate system expansion and maintenance.

A schematic diagram of the structure of the digital device middleware can be referred to FIG. 6. In actual video applications, there are a large number of different types and models of video encoding and decoding devices, which respectively transmit different encoding formats on the network through different transmission protocols (such as MPEG4). The audio and video information of H.264, H265, SVAC, etc., and the control methods of these devices are also very different. According to the characteristics of the digital device, the digital device component middleware decomposes various processing processes of the video application into several interface components, and the upper layer application can combine these interface components to generate complex applications, so that various digital codecs can be easily accessed. Devices such as DVRs and HD IPCs. The digital device component middleware decomposes the device management functions into several components, including IPoHost, IPoChannel, IPoPtzControl, IPoVodReader, IPoSourceChannel, IPoTargetChannel, IPoAudioChannel, IPoDecoder and other interfaces.

For unified management, a unified format is defined for various video streams, and a unified format is used for video forwarding and video storage. The video stream definition is shown in Figure 7.

Some video stream definitions are as follows:

FIG. 4 is a structural diagram of a video data processing apparatus according to an embodiment of the present invention. As shown in FIG. 4, the apparatus includes a receiving unit 410, a processing unit 420, and a transmission unit 430.

The receiving unit 410 is configured to receive a video request instruction of the first external device for the video data;

The processing unit 420 is configured to read corresponding video data from the second external device according to the video request instruction, and process the video data to obtain video data to be played.

Optionally, the video data includes at least analog video data, the video request instruction includes a digital control signal, the to-be-played video data includes digital video data to be played, and the processing unit 420 is further configured to: according to the digital control signal, Reading the analog video data in the second external device, processing the analog video data to obtain the digital video data to be played.

Optionally, the analog video data includes an analog video signal, and the processing unit 420 is further configured to: after the analog video data is read from the second external device according to the digital control signal, perform the analog video signal Sampling; quantifying the sampled analog video signal; encoding the quantized analog video signal to obtain digital video data to be played.

Optionally, the analog video signal includes a luminance signal, and the processing unit 420 is further configured to: sample the luminance signal in the read digital video data; filter the sampled luminance signal; and filter the filtered The luminance signal is added to the blanking substrate, and the amplitude of the luminance signal after adding the blanking substrate is adjusted according to the blanking control signal, and then the digital composite synchronization signal is inserted in the amplitude-adjusted luminance signal, where the digital control signal includes blanking control Signal and digital composite sync signals.

Optionally, the video data includes at least digital video data, the video request instruction includes an on-demand request instruction and a decoding instruction, the to-be-played video data includes analog video data to be played, and the processing unit 420 is further configured to: according to the on-demand request instruction And reading the digital video data from the second external device, and decoding the digital video data according to the decoding instruction to obtain the analog video data to be played.

The transmitting unit 430 is configured to transmit the video data to be played to the first external device.

In the description provided herein, numerous specific details are set forth. However, it is understood that the embodiments of the invention may be practiced without these specific details. In some instances, well-known methods, structures, and techniques are not shown in detail so as not to obscure the understanding of the description.

Embodiments of the present application may also provide a computer readable storage medium having stored thereon a computer program, wherein the computer program is executed by a processor to implement steps of the foregoing method Step.

Similarly, the various features of the invention are sometimes grouped together into a single embodiment, in the above description of the exemplary embodiments of the invention, Figure, or a description of it. However, the method disclosed is not to be interpreted as reflecting the intention that the claimed invention requires more features than those recited in the claims. Rather, as the following claims reflect, inventive aspects reside in less than all features of the single embodiments disclosed herein. Therefore, the claims following the specific embodiments are hereby explicitly incorporated into the embodiments, and each of the claims as a separate embodiment of the invention.

Those skilled in the art will appreciate that the modules or units or components of the devices in the examples disclosed herein may be arranged in a device as described in this embodiment, or alternatively may be positioned differently than the devices in this example. In one or more devices. The modules in the foregoing examples may be combined into one module or may be further divided into a plurality of sub-modules.

Those skilled in the art will appreciate that the modules in the devices of the embodiments can be adaptively changed and placed in one or more devices different from the embodiment. The modules or units or components of the embodiments may be combined into one module or unit or component, and further they may be divided into a plurality of sub-modules or sub-units or sub-components. In addition to such features and/or at least some of the processes or units being mutually exclusive, any combination of the features disclosed in the specification, including the accompanying claims, the abstract and the drawings, and any methods so disclosed, or All processes or units of the device are combined. Each feature disclosed in this specification (including the accompanying claims, the abstract and the drawings) may be replaced by alternative features that provide the same, equivalent or similar purpose.

In addition, those skilled in the art will appreciate that, although some embodiments described herein include certain features that are included in other embodiments and not in other features, combinations of features of different embodiments are intended to be within the scope of the present invention. Different embodiments are formed and formed. For example, under In the claims, any of the claimed embodiments can be used in any combination.

Furthermore, some of the described embodiments are described herein as a combination of methods or method elements that can be implemented by a processor of a computer system or by other means for performing the functions. Accordingly, a processor having the necessary instructions for implementing the method or method elements forms a means for implementing the method or method elements. Furthermore, the elements described herein of the device embodiments are examples of means for performing the functions performed by the elements for the purpose of carrying out the invention.

As used herein, the use of the ordinal "first", "second", "third", etc., to describe a generic object merely means a different instance referring to a similar object, and is not intended to imply such The objects being described must have a given order in time, space, ordering, or in any other way.

While the present invention has been described in terms of a limited number of embodiments, it will be understood by those skilled in the art that In addition, it should be noted that the language used in the specification has been selected primarily for the purpose of readability and teaching, and is not intended to be interpreted or limited. Therefore, many modifications and changes will be apparent to those skilled in the art without departing from the scope of the invention. The disclosure of the present invention is intended to be illustrative, and not restrictive, and the scope of the invention is defined by the appended claims.

Claims

A video data processing method includes:

Receiving a video request instruction of the first external device for the video data;

Reading corresponding video data from the second external device according to the video request instruction;

Processing the video data to obtain video data to be played, and transmitting the to-be-played video data to the first external device.
The method of claim 1, wherein the video data comprises at least: analog video data; the video request instruction comprises a digital control signal; the video data to be played comprises digital video data to be played;

Correspondingly, the video data is read from the second external device according to the video request instruction, and the video data is processed to obtain video data to be played, including:

And reading the analog video data from the second external device according to the digital control signal, and processing the analog video data to obtain the digital video data to be played.
The method of claim 2 wherein said analog video data comprises an analog video signal;

Correspondingly, the analog video data is read from the second external device according to the digital control signal, and the analog video data is processed to obtain the digital video data to be played, including:

After reading the analog video data from the second external device according to the digital control signal, sampling the analog video signal;

Quantifying the sampled analog video signal;

The quantized analog video signal is encoded to obtain digital video data to be played.
The method of claim 3 wherein said analog video signal comprises a luminance signal, said encoding said quantized analog video signal comprising:

Sampling the luminance signal in the read digital video data;

Filtering the sampled luminance signal;

Adding a blanking substrate to the filtered luminance signal, adjusting a magnitude of the luminance signal after adding the blanking substrate according to the blanking control signal, and inserting a digital composite synchronization signal into the amplitude-adjusted luminance signal; wherein the digital The control signal includes a blanking control signal and a digital composite sync signal.
The method of claim 1, wherein the video data comprises at least digital video data, the video request instruction comprises an on-demand request instruction and a decoding instruction, and the to-be-played video data comprises analog video data to be played;

Correspondingly, the video data is obtained from the second external device according to the video request instruction, and the video data is processed to obtain video data to be played, including:

And reading the digital video data from the second external device according to the on-demand request instruction, and decoding the digital video data according to the decoding instruction to obtain the analog video data to be played.
A video data processing apparatus comprising:

a receiving unit, configured to receive a video request instruction of the first external device for the video data;

The processing unit is configured to read corresponding video data from the second external device according to the video request instruction, and process the video data to obtain video data to be played;

And a transmission unit configured to transmit the to-be-played video data to the first external device.
The apparatus of claim 6, wherein the video data comprises at least analog video data, the video request instruction comprises a digital control signal, and the to-be-played video data comprises digital video data to be played;

The processing unit is configured to read the analog video data from the second external device according to the digital control signal, and process the analog video data to obtain the digital video data to be played.
The apparatus of claim 7 wherein said analog video data comprises analog video a signal, the processing unit, configured to: after reading the analog video data from the second external device according to the digital control signal, sampling the analog video signal; and sampling the sampled analog video signal Perform quantization; encode the quantized analog video signal to obtain digital video data to be played.
The apparatus of claim 8, wherein the analog video signal comprises a luminance signal, the processing unit configured to sample the luminance signal in the read digital video data; The luminance signal is filtered; the blanked substrate is added to the filtered luminance signal, the amplitude of the luminance signal after adding the blanking substrate is adjusted according to the blanking control signal, and then the digital composite synchronization signal is inserted into the amplitude-adjusted luminance signal. The digital control signal includes a blanking control signal and a digital composite sync signal.
The apparatus of claim 6, wherein the video data comprises at least digital video data, the video request instruction comprises an on-demand request instruction and a decoding instruction, and the to-be-played video data comprises analog video data to be played;

The processing unit is configured to read the digital video data from the second external device according to the request for the on-demand request, and decode the digital video data according to the decoding instruction to obtain the analog video data to be played. .
A computer readable storage medium having stored thereon a computer program, characterized in that the computer program, when executed by a processor, implements the steps of the method of claims 1 to 5.