CN115174991B - Display equipment and video playing method - Google Patents

Display equipment and video playing method Download PDF

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Publication number
CN115174991B
CN115174991B CN202210746695.2A CN202210746695A CN115174991B CN 115174991 B CN115174991 B CN 115174991B CN 202210746695 A CN202210746695 A CN 202210746695A CN 115174991 B CN115174991 B CN 115174991B
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China
Prior art keywords
data
media asset
video
audio
asset data
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CN202210746695.2A
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CN115174991A (en
Inventor
汤雯
麦土银
刘剑
杨圣
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Vidaa Netherlands International Holdings BV
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Vidaa Netherlands International Holdings BV
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
    • H04N21/44—Processing of video elementary streams, e.g. splicing a video clip retrieved from local storage with an incoming video stream, rendering scenes according to MPEG-4 scene graphs
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
    • H04N21/44—Processing of video elementary streams, e.g. splicing a video clip retrieved from local storage with an incoming video stream, rendering scenes according to MPEG-4 scene graphs
    • H04N21/44008—Processing of video elementary streams, e.g. splicing a video clip retrieved from local storage with an incoming video stream, rendering scenes according to MPEG-4 scene graphs involving operations for analysing video streams, e.g. detecting features or characteristics in the video stream
    • 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

Abstract

Some embodiments of the application show a display device and a video playing method, the method comprising: downloading first media asset data, decoding the first media asset data by using a hardware decoder, and controlling a display playing module to play the decoded first media asset data; creating a virtual decoder, downloading second media asset data, and decoding first audio/video data of the second media asset data by using the virtual decoder; when the first media asset data is played to a first preset time point, stopping decoding the first media asset data by using the hardware decoder, emptying the data in the hardware decoder, and controlling the display playing module to play the decoded first audio/video data; and decoding the second audio/video data of the second media data by using a hardware decoder, and controlling the display playing module to play the decoded second audio/video data after the playing of the first audio/video data is finished. According to the embodiment of the application, the two-way decoding is simulated by the single-way decoding platform, so that the video is rapidly and seamlessly switched, the user experience is improved, and the hardware cost is reduced.

Description

Display equipment and video playing method
Technical Field
The present application relates to the field of display devices, and in particular, to a display device and a video method.
Background
In the digital television platform, switching of various videos, such as inserting advertisements in the middle of network video playing, is often performed, and the switching is performed from broadband video to broadband video; for example, a TA (Targeted Advertising, targeted advertisement) application in HbbTV (Hybrid Broadcast/Broadband TV) can insert a targeted advertisement at the time of broadcasting live, which is switched from broadcasting to Broadband video. These above handoffs all relate to the performance of the television platform. Because of the specificity of televisions, it is often only necessary to play one video, i.e. most of the time one hardware decoder is already sufficient, and the hardware platform of current televisions is also mostly one-way decoding. When switching videos, one video needs to be stopped to play, the decoder is released to play another video again, obvious black screen or video stillness occurs in the switching process, and user experience is poor.
Disclosure of Invention
Some embodiments of the present application provide a display device and a video playing method, which simulate two-way decoding on a single-way decoding platform, so as to realize fast and seamless video switching, improve user experience, and reduce hardware cost.
In a first aspect, some embodiments of the present application provide a display apparatus, including:
A display playing module;
a controller configured to:
downloading first media asset data, decoding the first media asset data by using a hardware decoder, and controlling the display and play module to play the decoded first media asset data;
creating a virtual decoder, downloading second media asset data, and decoding first audio/video data of the second media asset data by using the virtual decoder;
when the first media asset data is played to a first preset time point, stopping decoding the first media asset data by using a hardware decoder, clearing data in the hardware decoder, and controlling the display and play module to play the decoded first audio and video data;
and decoding the second audio/video data of the second media data by using the hardware decoder, and controlling the display playing module to play the decoded second audio/video data after the playing of the first audio/video data is finished.
In some embodiments, the controller executing the creating a virtual decoder is further configured to:
and when the first media data is played to a second preset time point, creating the virtual decoder, wherein the difference value between the first preset time point and the second preset time point is a first preset value.
In some embodiments, in the step of creating a virtual decoder, the controller is further configured to:
and when the first media asset data is played to the target frame media asset data, creating the virtual decoder, wherein the difference value between the frame number of the media asset data corresponding to the first preset time point and the frame number of the target frame media asset data is a second preset value.
In some embodiments, the controller is configured to:
acquiring a key frame interval and a frame rate of video data in second media asset data;
if the value of the key frame interval is larger than or equal to the value of the frame rate, determining that the duration of the first audio-video data is the ratio of the key frame interval to the frame rate;
and if the key frame interval is smaller than the frame rate, determining that the duration of the first audio/video data is a first preset duration, wherein the next frame of video data corresponding to the first preset duration is key frame data.
In some embodiments, the controller executing the downloading of the second asset data, decoding the first audio-video data of the second asset data with the virtual decoder is further configured to:
downloading the second media asset data and simultaneously recording the duration of downloading the second media asset data;
After the time length of downloading the second media asset data reaches a second preset time length, if the video data in the second media asset data which is downloaded currently is key frame data, the first audio and video data are sent into the virtual decoder so that the virtual decoder decodes the first audio and video data, and the first audio and video data are the second media asset data before the key frame data.
In some embodiments, the second media asset data is broadcast data, the controller executing the downloading of the second media asset data is further configured to:
and if the video data in the second media asset data is key frame data, starting to download the second media asset data.
In some embodiments, the display playing module includes a display and an audio output interface, where the display is configured to display video data in the decoded first media asset data and the decoded second media asset data, and the audio output interface is configured to play audio data in the decoded first media asset data and the decoded second media asset data.
In a second aspect, some embodiments of the present application provide a video playing method, including:
downloading first media asset data, decoding the first media asset data by using a hardware decoder, and controlling the display and play module to play the decoded first media asset data;
Creating a virtual decoder, downloading second media asset data, and decoding first audio/video data of the second media asset data by using the virtual decoder;
when the first media asset data is played to a first preset time point, stopping decoding the first media asset data by using a hardware decoder, clearing data in the hardware decoder, and controlling the display and play module to play the decoded first audio and video data;
and decoding the second audio/video data of the second media data by using the hardware decoder, and controlling the display playing module to play the decoded second audio/video data after the playing of the first audio/video data is finished.
In some embodiments, the step of creating a virtual decoder comprises:
and when the first media data is played to a second preset time point, creating the virtual decoder, wherein the difference value between the first preset time point and the second preset time point is a first preset value.
In some embodiments, the step of creating a virtual decoder comprises:
and when the first media asset data is played to the target frame media asset data, creating the virtual decoder, wherein the difference value between the frame number of the media asset data corresponding to the first preset time point and the frame number of the target frame media asset data is a second preset value.
Some embodiments of the application provide a display device and a video playing method. In the process of playing the first media asset data, the virtual decoder is utilized to decode the first audio and video data of the second media asset data, namely the previous section of data of the second media asset data, when the first media asset data is played to a switching time point, the first audio and video data decoded by the virtual decoder is directly played, in the process, the data in the hardware decoder is cleared, the hardware decoder is utilized to decode the second audio and video data of the second media asset data, namely the subsequent data of the second media asset data, after the first audio and video data is played, the second audio and video data is played, the quick seamless switching of two videos is realized, the condition of black screen or static picture in the switching process is avoided, and the user experience is improved.
Drawings
FIG. 1 illustrates an operational scenario between a display device and a control apparatus according to some embodiments;
fig. 2 shows a hardware configuration block diagram of the control device 100 according to some embodiments;
fig. 3 illustrates a hardware configuration block diagram of a display device 200 according to some embodiments;
FIG. 4 illustrates a software configuration diagram in a display device 200 according to some embodiments;
FIG. 5 illustrates an interaction diagram of components within a display device provided in accordance with some embodiments;
FIG. 6 illustrates an interaction diagram of components within a display device provided in accordance with some embodiments; the method comprises the steps of carrying out a first treatment on the surface of the
FIG. 7 illustrates a variation graph of media asset switching provided according to some embodiments;
FIG. 8 illustrates a variation graph of media asset switching provided according to some embodiments;
FIG. 9 illustrates a flow chart performed by a controller provided in accordance with some embodiments;
FIG. 10 illustrates an interaction diagram of components within a display device provided in accordance with some embodiments;
FIG. 11 illustrates a variation graph of media asset switching provided according to some embodiments;
FIG. 12 illustrates a variation graph of network video insertion advertisements provided in accordance with some embodiments;
fig. 13 illustrates a variation diagram of a broadcast live insertion advertisement provided in accordance with some embodiments.
Detailed Description
For the purposes of making the objects and embodiments of the present application more apparent, an exemplary embodiment of the present application will be described in detail below with reference to the accompanying drawings in which exemplary embodiments of the present application are illustrated, it being apparent that the exemplary embodiments described are only some, but not all, of the embodiments of the present application.
It should be noted that the brief description of the terminology in the present application is for the purpose of facilitating understanding of the embodiments described below only and is not intended to limit the embodiments of the present application. Unless otherwise indicated, these terms should be construed in their ordinary and customary meaning.
The terms first and second and the like in the description and in the claims and in the above-described figures are used for distinguishing between similar or similar objects or entities and not necessarily for describing a particular sequential or chronological order, unless otherwise indicated. It is to be understood that the terms so used are interchangeable under appropriate circumstances.
The terms "comprises," "comprising," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a product or apparatus that comprises a list of elements is not necessarily limited to all elements explicitly listed, but may include other elements not expressly listed or inherent to such product or apparatus.
The display device provided by the embodiment of the application can have various implementation forms, for example, a television, an intelligent television, a laser projection device, a display (monitor), an electronic whiteboard (electronic bulletin board), an electronic desktop (electronic table) and the like. Fig. 1 and 2 are specific embodiments of a display device of the present application.
Fig. 1 is a schematic diagram of an operation scenario between a display device and a control apparatus according to an embodiment. As shown in fig. 1, a user may operate the display device 200 through the smart device 300 or the control apparatus 100.
In some embodiments, the control apparatus 100 may be a remote controller, and the communication between the remote controller and the display device includes infrared protocol communication or bluetooth protocol communication, and other short-range communication modes, and the display device 200 is controlled by a wireless or wired mode. The user may control the display device 200 by inputting user instructions through keys on a remote control, voice input, control panel input, etc.
In some embodiments, a smart device 300 (e.g., mobile terminal, tablet, computer, notebook, etc.) may also be used to control the display device 200. For example, the display device 200 is controlled using an application running on a smart device.
In some embodiments, the display device may receive instructions not using the smart device or control device described above, but rather receive control of the user by touch or gesture, or the like.
In some embodiments, the display device 200 may also perform control in a manner other than the control apparatus 100 and the smart device 300, for example, the voice command control of the user may be directly received through a module configured inside the display device 200 device for acquiring voice commands, or the voice command control of the user may be received through a voice control device configured outside the display device 200 device.
In some embodiments, the display device 200 is also in data communication with a server 400. The display device 200 may be permitted to make communication connections via a Local Area Network (LAN), a Wireless Local Area Network (WLAN), and other networks. The server 400 may provide various contents and interactions to the display device 200. The server 400 may be a cluster, or may be multiple clusters, and may include one or more types of servers.
Fig. 2 exemplarily shows a block diagram of a configuration of the control apparatus 100 in accordance with an exemplary embodiment. As shown in fig. 2, the control device 100 includes a controller 110, a communication interface 130, a user input/output interface 140, a memory, and a power supply. The control apparatus 100 may receive an input operation instruction of a user and convert the operation instruction into an instruction recognizable and responsive to the display device 200, and function as an interaction between the user and the display device 200.
As shown in fig. 3, the display apparatus 200 includes at least one of a modem 210, a communicator 220, a detector 230, an external device interface 240, a controller 250, a display 260, an audio output interface 270, a memory, a power supply, and a user interface.
In some embodiments the controller includes a processor, a video processor, an audio processor, a graphics processor, RAM, ROM, a first interface for input/output to an nth interface.
The display 260 includes a display screen component for presenting a picture, and a driving component for driving an image display, a component for receiving an image signal from the controller output, displaying video content, image content, and a menu manipulation interface, and a user manipulation UI interface.
The display 260 may be a liquid crystal display, an OLED display, a projection device, or a projection screen.
The communicator 220 is a component for communicating with external devices or servers according to various communication protocol types. For example: the communicator may include at least one of a Wifi module, a bluetooth module, a wired ethernet module, or other network communication protocol chip or a near field communication protocol chip, and an infrared receiver. The display device 200 may establish transmission and reception of control signals and data signals with the external control device 100 or the server 400 through the communicator 220.
A user interface, which may be used to receive control signals from the control device 100 (e.g., an infrared remote control, etc.).
The detector 230 is used to collect signals of the external environment or interaction with the outside. For example, detector 230 includes a light receiver, a sensor for capturing the intensity of ambient light; alternatively, the detector 230 includes an image collector such as a camera, which may be used to collect external environmental scenes, user attributes, or user interaction gestures, or alternatively, the detector 230 includes a sound collector such as a microphone, or the like, which is used to receive external sounds.
The external device interface 240 may include, but is not limited to, the following: high Definition Multimedia Interface (HDMI), analog or data high definition component input interface (component), composite video input interface (CVBS), USB input interface (USB), RGB port, or the like. The input/output interface may be a composite input/output interface formed by a plurality of interfaces.
The modem 210 receives broadcast television signals through a wired or wireless reception manner, and demodulates audio and video signals, such as EPG data signals, from a plurality of wireless or wired broadcast television signals.
In some embodiments, the controller 250 and the modem 210 may be located in separate devices, i.e., the modem 210 may also be located in an external device to the main device in which the controller 250 is located, such as an external set-top box or the like.
The controller 250 controls the operation of the display device and responds to the user's operations through various software control programs stored on the memory. The controller 250 controls the overall operation of the display apparatus 200. For example: in response to receiving a user command to select a UI object to be displayed on the display 260, the controller 250 may perform an operation related to the object selected by the user command.
In some embodiments the controller includes at least one of a central processing unit (Central Processing Unit, CPU), video processor, audio processor, graphics processor (Graphics Processing Unit, GPU), RAM Random Access Memory, RAM), ROM (Read-Only Memory, ROM), first to nth interfaces for input/output, a communication Bus (Bus), and the like.
The user may input a user command through a Graphical User Interface (GUI) displayed on the display 260, and the user input interface receives the user input command through the Graphical User Interface (GUI). Alternatively, the user may input the user command by inputting a specific sound or gesture, and the user input interface recognizes the sound or gesture through the sensor to receive the user input command.
A "user interface" is a media interface for interaction and exchange of information between an application or operating system and a user, which enables conversion between an internal form of information and a user-acceptable form. A commonly used presentation form of the user interface is a graphical user interface (Graphic User Interface, GUI), which refers to a user interface related to computer operations that is displayed in a graphical manner. It may be an interface element such as an icon, a window, a control, etc. displayed in a display screen of the electronic device, where the control may include a visual interface element such as an icon, a button, a menu, a tab, a text box, a dialog box, a status bar, a navigation bar, a Widget, etc.
As shown in fig. 4, the system of the display device is divided into three layers, an application layer, a middleware layer, and a hardware layer, from top to bottom.
The application layer mainly comprises common applications on the television, and an application framework (Application Framework), wherein the common applications are mainly applications developed based on Browser, such as: HTML5 APPs; native applications (Native APPs);
the application framework (Application Framework) is a complete program model with all the basic functions required by standard application software, such as: file access, data exchange, and the interface for the use of these functions (toolbar, status column, menu, dialog box).
Native applications (Native APPs) may support online or offline, message pushing, or local resource access.
The middleware layer includes middleware such as various television protocols, multimedia protocols, and system components. The middleware can use basic services (functions) provided by the system software to connect various parts of the application system or different applications on the network, so that the purposes of resource sharing and function sharing can be achieved.
The hardware layer mainly comprises a HAL interface, hardware and a driver, wherein the HAL interface is a unified interface for all the television chips to be docked, and specific logic is realized by each chip. The driving mainly comprises: audio drive, display drive, bluetooth drive, camera drive, WIFI drive, USB drive, HDMI drive, sensor drive (e.g., fingerprint sensor, temperature sensor, pressure sensor, etc.), and power supply drive, etc.
In the digital television platform, switching of various videos, such as inserting advertisements in the middle of network video playing, is often performed, and the switching is performed from broadband video to broadband video; for example TA applications in HbbTV, targeted advertising can be inserted at the time of broadcasting live, which is switching from broadcasting to broadband video. These above handoffs all relate to the performance of the television platform. Because of the specificity of televisions, it is often only necessary to play one video, i.e. most of the time one hardware decoder is already sufficient, and the hardware platform of current televisions is also mostly one-way decoding.
In some embodiments, as shown in fig. 5, the first media asset data is downloaded, decoded by a hardware decoder, and played by a display playing module. In the process of playing the first media data, the hardware decoder is occupied by the first media data, when the first media data is ready to be switched to the second media data, the second media data is downloaded, and the second media data can be directly transmitted to the hardware decoder, but at the moment, the hardware decoder still has part of the first media data to be decoded, and the first media data can be still needed to be continuously played for switching to the second media data. The first media asset data and the second media asset data refer to media resource data which can be acquired from an application program or a channel and displayed and played by a display device, and the media resource data comprise videos, pictures and the like. Videos include web videos and broadcast live videos.
In some embodiments, as shown in fig. 6, the first media asset data is downloaded, decoded by a hardware decoder, and played by a display playing module. In the process of playing the first media data, the hardware decoder is occupied by the first media data, when the first media data is ready to be switched to the second media data, the first media data is stopped to be played, the decoder is released, namely the first media data in the decoder is emptied, the second media data is downloaded, the second media data is directly transmitted to the hardware decoder, and the second media data is played by the display control module after decoding. In the process of stopping playing the first media data to playing the second media data, a black screen state may exist on the display screen, and the changing state is shown in fig. 7. In the process of stopping playing the first media data to playing the second media data, the display screen may have a still state of the first media data screen, and the change state is shown in fig. 8.
When the video is switched, the video can not be switched from one video to another in time, or one video needs to be stopped to play first, the decoder is released to play another video again, obvious black screen or video still occurs in the switching process, and the user experience is poor.
In order to solve the above technical problems, the embodiments of the present application provide a display device 200, and the structure and functions of each part of the display device 200 may be referred to the above embodiments. In addition, on the basis of the display device 200 shown in the above embodiment, the present embodiment further improves some functions of the display device 200, and as shown in fig. 9, the controller 250 performs the following steps:
step S901, first media asset data is downloaded, the first media asset data is decoded by a hardware decoder, and the display and play module is controlled to play the decoded first media asset data.
In some embodiments, an instruction for playing the first media asset data is received from a user input, a storage address of the first media asset data is obtained, and the first media asset data is downloaded from the storage address. The first asset data includes video data and audio data. Wherein, the video data is video stream data, and the audio data is audio stream data. In the downloading process, it is necessary to sequentially download audio data and video data of one frame into the display device 200.
In some embodiments, the video data and the audio data of the first media data may be stored in the same storage address, and the video data and the audio data may also be stored in different storage addresses, respectively, but when downloading the data, the video data and the audio data need to be downloaded to the display device 200 at the same time.
In some embodiments, the downloaded first media data is in an encoded format, the display device cannot directly display and play the first media data, and the first media data needs to be sent to a decoder for decoding, and the decoded first media data can be played by a display playing module. The decoder includes a hardware decoder and a software decoder. The hardware decoder decodes the video stream using GPU (Graphics Processing Unit, graphics processor) resources; the software decoder decodes the audio and video data by a software method, namely, the central processing unit bears the decoding work.
In some embodiments, the display play module includes a display and an audio output interface. Video data and audio data of the first media asset data are fed into a hardware decoder. The hardware decoder decodes the video data in the first media data to obtain decoded video data, the decoded video data is sent to the graphic rendering module for processing, and the display displays the decoded video data. The hardware decoder decodes the audio data in the first media data to obtain decoded audio data, the decoded audio data is sent to the audio output interface, and the audio output interface plays the decoded audio data. The video data displayed by the display corresponds to the audio data played by the audio output interface, so that the aim of synchronizing the audio and the video is fulfilled.
Step S902, creating a virtual decoder, downloading second media asset data, and decoding first audio/video data of the second media asset data by using the virtual decoder;
in some embodiments, the virtual decoder is created by a browser in the display device 200. Virtual decoders are essentially a type of software decoder. The virtual decoder may be created by the browser before downloading the second asset data and deleted after it is no longer needed to decode the asset data. The virtual decoder can also exist all the time after creation, and is released after decoding the media data so that the virtual decoder does not occupy the resources of the central processing unit.
In some embodiments, a virtual decoder may be created upon initial playback of the first asset data, and the second asset data is downloaded, with the virtual decoder being utilized to decode the first audio video data of the second asset data.
In some embodiments, to avoid the virtual decoder being preempted, the virtual decoder may be created a period of time before switching video, either to not preempt the virtual decoder or to have enough time to complete the download of the first audio-video data of the second media data.
In some embodiments, the step of creating a virtual decoder comprises:
when the first media data is played to a second preset time point, a virtual decoder is created, wherein the difference value between the first preset time point and the second preset time point is a first preset value. The first preset time point is a media data switching time point, and the first preset time point and the second preset time point can be directly acquired in application. The first preset time point and the first preset value can be directly obtained in the application, and the second preset time point is deduced from the first preset time point and the first preset value. The first preset time point and the second preset time point may be play time points of the first media data, and may also be system time points.
For example, if the first media data is broadband video, and the first preset time point is 00:30:00 and the second preset time point is 00:29:30, when the first media data is played to 00:29:30, a virtual decoder is created, and the second media data is started to be downloaded, and when the first media data is played to 00:30:00, media data switching is realized.
For example, the first media data is a broadcast video, the known first preset time point is 08:30:00 am, the first preset value is 30s, and the second preset time point is 08:29:30 am. When the first media data is played, a virtual decoder is created when the system time reaches 08:29:30 am, the second media data is downloaded, and when the first media data is played, the media data switching is realized when the system time reaches 08:30:00 am. The embodiment of the application takes the system time as a reference, and can switch the media data at fixed time in one day.
In some embodiments, the step of creating a virtual decoder comprises:
when the first media data is played to a second preset time length, a virtual decoder is created, wherein the difference value between the first preset time length and the second preset time length is a third preset value. The first preset time length is used for determining a media data switching time point, and the first preset time length and the second preset time length can be directly acquired in the application. The first preset time length and the third preset value can be directly obtained in the application, and the second preset time length is deduced from the first preset time length and the third preset value.
For example, the first media data is a broadcast video, the playing time is recorded after the broadcast data starts to be played, the first preset time point is known to be 30 minutes, the third preset value is known to be 1 minute, and the second preset time point can be deduced to be 29 minutes. Creating a virtual decoder when the first media data is played for 29 minutes, downloading the second media data, and realizing media data switching when the first media data is played for 30 minutes. According to the embodiment of the application, the broadcast data playing time length is taken as a reference, and the user can switch to the second media data after watching a certain time length.
In some embodiments, the step of creating a virtual decoder comprises:
And when the first media asset data is played to the target frame media asset data, creating the virtual decoder, wherein the difference value between the frame number of the media asset data corresponding to the first preset time point and the frame number of the target frame media asset data is a second preset value. The frame number of the media asset data corresponding to the first preset time point and the frame number of the target frame media asset data can be directly acquired in the application, the first preset time point and the second preset value can be directly acquired in the application, and the frame number of the target frame media asset data is deduced from the frame number of the media asset data corresponding to the first preset time point and the second preset value.
For example, the first media asset data is a broadband video, the known target frame media asset data is the 90 th frame of the video, the first preset time point is 00:30:00, when the first media asset data is played to the 90 th frame, a virtual decoder is created, the second media asset data is downloaded, and when the first media asset data is played to the 00:30:00, the second media asset data is played.
The first media asset data is a broadband video, the first preset time point is known to be 00:30:00, the number of frames corresponding to the first preset time point is 100 th frame, the second preset value is 10 th frame, the target frame media asset data is 90 th frame of the video, when the first media asset data is played to the 90 th frame, a virtual decoder is created, the second media asset data is downloaded, and when the first media asset data is played to the 00:30:00 or played to the 100 th frame, the second media asset data is played.
In some embodiments, the controller invokes a switch interface when playing the first asset data, where the interface includes an asset data switching time, a switching object (second asset data), and the like. Before invoking the switch interface, the resource of an object to be switched is loaded, i.e. the second media asset data is downloaded.
In some embodiments, after creating the virtual decoder, a storage address for the second asset data is obtained and the second asset data is downloaded from the storage address.
In some embodiments, after the step of creating the virtual decoder, the controller is further configured to perform the steps of:
judging whether the first frame of video data of the second media asset data is key frame data or not;
the key frame, also called I frame, is usually the first frame of each GOP (Group of Pictures ), and is moderately compressed to serve as a reference point for random access, and can be used as an image. GOP is a video compression technique used by MPEG. Key frames, which are important frames in inter-frame compression coding; it is a full frame compressed coded frame; the complete image can be reconstructed only by using the data of the key frame during decoding; the key frame is generated without reference to other pictures.
The second media data comprises video data and audio data, after the video data is downloaded, the video data can be analyzed, and whether the video data contains the identification of the key frame data or not is judged. If the first frame of video data contains the identification of the key frame data, determining the first frame of video data as the key frame data; if the first frame of video data does not contain the identification of the key frame data, determining that the first frame of video data is not the key frame data;
and if the first frame of video data in the second media asset data is key frame data, starting to download the second media asset data, and determining the first audio/video data of the second media asset data.
In some embodiments, the duration of the first audio/video data may be set to a preset duration, for example, the first audio/video data is the first 2 seconds of audio/video data of the second media data, and it is necessary to supplement that the next frame data of the corresponding video data is the key frame data when 2 seconds are required.
In some embodiments, the first audio and video data may be audio and video data of a preset frame number, for example, the first audio and video data is the first 100 frames of video data and the first 100 frames of audio data in the second media data, and it is necessary to supplement that the 101 st frames of data is key frame data.
In some embodiments, since the second audio-video data following the first audio-video data must start with the key frame data, the duration of the first audio-video data needs to be calculated or determined in conjunction with the actual situation.
In some embodiments, the step of determining the first audio video data of the second media asset data comprises:
acquiring a key frame interval and a frame rate of video data in second media asset data;
wherein the key frame interval is the interval length of the key frames in the video data. For example: the key frame interval is 60 frames and frame 1 is the key frame, then frame 61, frame 121, … are both key frames. The Frame rate (Frame rate) is the frequency at which bitmap images in units of frames appear continuously on the display. For example: the frame rate is 60fps, which means that 60 frames of video data, which is image data, can be played within 1 second.
If the key frame interval is greater than or equal to the frame rate, the duration of the first audio-video data is the ratio of the key frame interval to the frame rate;
illustratively, the key frame interval is 60 frames, the frame rate is 25fps, and the duration t=60/25=2.4 s of the first audio-video data; the key frame interval is 40 frames, the frame rate is 25fps, and the duration t=40/25=1.6 s of the first audio-video data.
And if the key frame interval is smaller than the frame rate, the duration of the first audio/video data is a first preset duration, wherein the next frame data of the video data corresponding to the first preset duration is key frame data.
For example, the key frame interval is 10 frames, the frame rate is 50fps, the first preset duration is 2s, the duration of the first audio/video data is 2s, the corresponding video data at 2s is the 100 th frame, and the 101 st frame video data is the key frame data.
If the next frame data of the frame where the first preset duration is located is not key frame data, the second media resource data needs to be continuously downloaded and analyzed until the key frame data is identified, and the data before the key frame data are sent to a virtual decoder for decoding.
For example, the key frame interval is 15 frames, the frame rate is 50fps, the first preset duration is 2 seconds, after the first audio-video data reaches the first preset duration for 2 seconds, the 101 st frame of video data is not the key frame data, whether the 102 th frame of video data is the key frame data needs to be continuously judged until the 106 th frame of video data is the key frame data is identified, and the first audio-video data is the previous 105 frames of data.
According to the embodiment of the application, the time length of the first audio data is determined through the key frame interval and the frame rate of the video data in the second media data, so that key frame identification is not needed for each frame of video data, and the first audio and video data can be conveniently and rapidly sent into the virtual decoder.
In some embodiments, the second media asset data may be directly transmitted to the virtual decoder after being downloaded, and the second media asset data may be stopped from being continuously transmitted to the virtual decoder after reaching the duration of the first audio/video or after being downloaded to a certain frame. And the first audio and video data can be transmitted to the virtual decoder together after being downloaded.
In some embodiments, after the step of starting downloading the second media asset data, the step of determining the first audio-video data of the second media asset data comprises:
after the time length of the downloaded second media data reaches a second preset time length, judging whether the video data in the second media data which is downloaded currently is key frame data or not;
if the video data in the second media asset data which is downloaded currently is key frame data, determining that the first audio and video data is second media asset data before the key frame data;
if the video data in the second media asset data which is downloaded currently is not the key frame data, downloading the video data in the second media asset data of the next frame, judging whether the video data in the second media asset data of the next frame is the key frame data or not until the key frame data is identified, and determining the first audio/video data according to the key frame data.
The second preset time period is 1s, for example. Taking a key frame interval of 60 frames and a frame rate of 25fps as an example, after downloading the second media data of 1s, namely after downloading 25 frames of data, starting to judge whether the downloaded video data is key frame data, and when the 61 st frame of data is identified as key frame data, determining that the first audio/video data is the first 60 frames of data. Taking a key frame interval of 20 frames and a frame rate of 25fps as an example, after downloading second media data of 1s, namely after downloading 25 frames of data, starting to judge whether the downloaded video data is key frame data, and when recognizing that 41 st frame data is key frame data, determining that the first audio/video data is first 40 frames of data.
According to the embodiment of the application, the frame number of the first audio and video can be determined without complex calculation by acquiring the key frame interval and the frame rate of the second media data, so that the first audio and video data can be conveniently transmitted to the virtual decoder.
If the first frame of video data in the second media asset data is not the key frame data, continuing to identify whether the next frame of video data is the key frame data or not until the key frame data is identified, and starting to download the second media asset data.
In some embodiments, after the step of creating the virtual decoder, the controller is further configured to perform the steps of:
Judging whether the second media asset data is broadcast data or not;
the second asset data may be broadband video data or broadcast data. Broadband video data refers to complete video such as movies, advertisements, etc. that can be downloaded and played from a network. Broadcast data broadcasting is an intelligent device such as a digital television set-top box, a digital television receiver, a personal computer (pc), and a mobile device of a user that transmits various data information such as digitized audio, video, images, moving pictures, software, and computer files in a push manner through a digital television broadcast channel. Wherein the first frame of video data of the broadband video data is necessarily key frame data, and the first frame of video data of the broadcast data is not necessarily key frame data.
In some embodiments, the data identification of the downloaded second media asset data may be identified prior to downloading the second media asset data. If the data identifier is a first preset identifier, determining that the second media asset data is broadband video data; and if the data identifier is a second preset identifier, determining that the second media asset data is broadcast data. Illustratively, if the data identification is 1, determining that the second media asset data is broadband video data; and if the data identifier is 0, determining that the second media asset data is broadcast data.
And if the second media asset data is not broadcast data, starting to download the second media asset data, and determining the first audio/video data of the second media asset data.
If the second media asset data is broadcast data, judging whether the video data of the current second media asset data is key frame data or not;
and if the video data of the current second media asset data is key frame data, starting to download the second media asset data, and determining the first audio/video data of the second media asset data.
If the video data of the current second media asset data is not the key frame data, continuing to identify whether the next frame of video data is the key frame data or not, and starting to download the second media asset data until the key frame data is identified, and determining the first audio/video data of the second media asset data.
In some embodiments, video data and audio data of the first audio-video data are fed into the virtual decoder. And decoding the video data in the first audio and video data by a virtual decoder to obtain decoded video data. And decoding the audio data in the first media data by a hardware decoder to obtain decoded audio data. Wherein the decoded video data and audio data are not displayed and played first.
Step 903, stopping decoding the first media asset data by using the hardware decoder when the first media asset data is played to a first preset time point, emptying the data in the hardware decoder, and controlling the display playing module to play the decoded first audio/video data;
In some embodiments, when the first media data is played to the first preset time point, downloading the first media data to the hardware decoder is stopped, decoding of the first media data by the hardware decoder is stopped, and at the same time, sending of the first media data to the display playing module is stopped. At this time, there may be first media data already downloaded and not decoded in the hardware decoder, and the data in the hardware decoder needs to be emptied, or the currently occupied hardware decoder is released. Before the first media asset data is played to a first preset time point, the first audio and video data in the second media asset data are decoded by the virtual decoder, the first audio and video data decoded by the virtual decoder are sent to the display and play module, and the display and play module is controlled to play the first audio and video data.
In some embodiments, the video data of the decoded first audio-video data is sent to a graphics rendering module for processing, and the decoded video data is displayed by a display. And sending the audio data of the decoded first audio/video data to an audio output interface, and playing the decoded audio data by the audio output interface.
In some embodiments, the video data of the first media data corresponds to the next frame data of the video frame at the first preset time point as the key frame data. So that after the second media data playing is switched to the first media data, the downloading and playing can be directly started from the key frame data, and the situation that some video frames cannot be decoded and displayed under the condition of irrelevant key frame data is avoided.
And step S904, decoding the second audio/video data of the second media data by using the hardware decoder, and controlling the display playing module to play the decoded second audio/video data after the playing of the first audio/video data is finished.
In some embodiments, the video data and the audio data of the second audio-video data are sent to the hardware decoder while the display playing module is controlled to play the decoded first audio-video data. And decoding the video data in the second audio and video data by a hardware decoder to obtain decoded video data, sending the decoded video data to a graphic rendering module for processing after the playing of the first audio and video data is finished, and displaying the decoded video data by a display. And decoding the audio data in the second audio-video data by a hardware decoder to obtain decoded audio data, after the playing of the first audio-video data is finished, sending the decoded audio data to an audio output interface, and playing the decoded audio data by the audio output interface. The video data displayed by the display corresponds to the audio data played by the audio output interface, so that the aim of synchronizing the audio and the video is fulfilled.
Fig. 10 is a timing chart showing the components in the device. As shown in fig. 10, the downloading module sends the first media data to the hardware decoder, the hardware decoder decodes the first media data, the hardware decoder sends the decoded video data to the display for display, and sends the decoded audio data to the audio output interface for playing. Before switching the second media data, the downloading module downloads the first audio and video data in the second media data, sends the first audio and video data to the virtual decoder, decodes the first audio and video data by the virtual decoder, stops decoding and playing the first media data when switching the second media data, releases the hardware decoder, sends the decoded video data to the display for display by the virtual decoder, and sends the decoded audio data to the audio output interface for playing. When the first audio and video data are played, the downloading module sends the downloaded second audio and video data of the second media data to the hardware decoder, the hardware decoder decodes the second audio and video data, sends the decoded video data to the display for display, and sends the decoded audio data to the audio output interface for playing.
When the first media data is stopped, a part of data in the second media data is decoded by the created virtual decoder, and the switching can be performed at any time, and the switching effect is shown in fig. 11. In the embodiment of the application, only a small part of data is decoded by the virtual decoder, so that the consumption of the whole system is not great, the memory of the central processing unit is not occupied for a long time, and the overall performance of the display equipment is not influenced.
Embodiment-broadband video and broadband video switching
Taking the example of inserting advertisements in the middle of network video playing. The user inputs an instruction to play the network video, downloads and decodes and plays the network video by using a hardware decoder. 10 seconds before inserting the advertisement, creating a virtual decoder, downloading the first 2 seconds of data of the advertisement, and the next frame of the 2 seconds corresponding video frame is I frame data. The virtual decoder decodes the first two seconds of advertisement data. When the advertisement switching point is reached, the hardware decoder stops decoding the network video data, stops playing the network video data and seamlessly inserts advertisements. The next frame of the network video corresponding to the video frame at the advertisement switching point is I-frame data. And 10 seconds before the advertisement is finished, downloading network video data 2 seconds after the advertisement switching point, wherein the next frame of the video frame corresponding to 2 seconds is I frame data. The virtual decoder decodes 2 seconds of network video data. When the network video switching point is reached, the hardware decoder stops decoding the advertisement, stops playing the advertisement and seamlessly continues playing the network video. As shown in effect 1 in fig. 12, the network video is played from the group 1 to the group 4 … without the advertisement inserted. As shown in effect 2 in fig. 12, when an advertisement is inserted, the network video is played from the screen group 1 to the screen group 3, then the advertisement screen group 5 and the screen group 6 are seamlessly inserted, and then the network video is played from the screen group 4 … continuously.
Embodiment two broadband video and broadcast live broadcast switching
Taking the example of inserting targeted advertisements in broadcast live broadcast. The user inputs an instruction to open channel 1 in the broadcast, downloads and decodes and plays the content of channel 1 using the hardware decoder. 10 seconds before inserting the advertisement, creating a virtual decoder, downloading the first 2 seconds of data of the advertisement, and the next frame of the 2 seconds corresponding video frame is I frame data. The virtual decoder decodes the first two seconds of advertisement data. When the advertisement switching point is reached, the hardware decoder stops decoding the channel 1 data, stops playing the channel 1 data and inserts the advertisement seamlessly. 5 seconds before the advertisement is finished, whether the video data in the channel 1 is I frame data or not is identified, and if the video data is the I frame data, the downloading of the data of the channel 1 is started. If it is not the video data in channel 1 that is not the I-frame data, continuing to identify whether the next frame of video data is the I-frame data. The virtual decoder decodes the data of channel 1. When the channel 1 switch point is reached, the hardware decoder stops decoding the advertisement, stops playing the advertisement and seamlessly continues playing the content of channel 1. As shown in effect 1 in fig. 13, channel 1 is played from group 1 to group 4 … without the insertion of an advertisement. As shown in effect 2 in fig. 13, when the advertisement is inserted, the network video is played from the screen group 1 to the screen group 2, then the advertisement screen group 5 is seamlessly inserted, and then the network video is played from the screen group 4 … continuously.
Embodiment three broadcast live and broadcast live switching
Taking the example of switching to reserve another channel in advance when watching a certain channel in the broadcast live broadcast. The user is at 16:00 reserves to watch the a program on channel 2. The user is at 15:00 inputs the instruction of opening channel 2 in the broadcast, downloads and decodes and plays the content of channel 2 by using a hardware decoder. At 15:55, creating a virtual decoder, identifying whether the video data in channel 1 is I frame data, and if so, starting to download the data of channel 1. The virtual decoder decodes the data of channel 1. At arrival 16: and 00, the hardware decoder stops decoding the channel 1 data, stops playing the channel 1 data and seamlessly plays the content of the channel 2.
Some embodiments of the present application provide a display device and a video playing method, the method being applicable to the display device, the display device including a display playing module and a controller configured to: downloading first media asset data, decoding the first media asset data by using a hardware decoder, and controlling the display and play module to play the decoded first media asset data; creating a virtual decoder, downloading second media asset data, and decoding first audio/video data of the second media asset data by using the virtual decoder; when the first media asset data is played to a first preset time point, stopping decoding the first media asset data by using a hardware decoder, clearing data in the hardware decoder, and controlling the display and play module to play the decoded first audio and video data; and decoding the second audio/video data of the second media data by using the hardware decoder, and controlling the display playing module to play the decoded second audio/video data after the playing of the first audio/video data is finished. According to the embodiment of the application, the two-way decoding is simulated by the single-way decoding platform, so that the video is rapidly and seamlessly switched, the user experience is improved, and the hardware cost is reduced.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present application, and not for limiting the same; although the application has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the application.
The foregoing description, for purposes of explanation, has been presented in conjunction with specific embodiments. However, the illustrative discussions above are not intended to be exhaustive or to limit the embodiments to the precise forms disclosed above. Many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles and the practical application, to thereby enable others skilled in the art to best utilize the embodiments and various embodiments with various modifications as are suited to the particular use contemplated.

Claims (10)

1. A display device, characterized by comprising:
a display playing module;
A controller configured to:
downloading first media asset data, decoding the first media asset data by using a hardware decoder, and controlling the display and play module to play the decoded first media asset data;
creating a virtual decoder, and identifying a data identifier of the second media asset data; when the data identifier is a first preset identifier, determining that the second media asset data is broadband video data; when the data identifier is a second preset identifier, determining that second media asset data is broadcast data;
if the second media asset data is broadcast data, judging whether the video data of the second media asset data is key frame data or not, and downloading the second media asset data when the video data is key frame data; downloading the second media asset data if the second media asset data is not broadcast data;
decoding first audio/video data of the second media asset data by using the virtual decoder;
when the first media asset data is played to a first preset time point, stopping decoding the first media asset data by using a hardware decoder, clearing data in the hardware decoder, and controlling the display and play module to play the decoded first audio and video data; the video data of the first media asset data corresponds to the next frame data of the video frame at a first preset time point and is key frame data;
And decoding the second audio/video data of the second media data by using the hardware decoder, and controlling the display playing module to play the decoded second audio/video data after the playing of the first audio/video data is finished.
2. The display device of claim 1, wherein the controller executing the create virtual decoder is further configured to:
and when the first media data is played to a second preset time point, creating the virtual decoder, wherein the difference value between the first preset time point and the second preset time point is a first preset value.
3. The display device of claim 1, wherein in the step of creating a virtual decoder, the controller is further configured to:
and when the first media asset data is played to the target frame media asset data, creating the virtual decoder, wherein the difference value between the frame number of the media asset data corresponding to the first preset time point and the frame number of the target frame media asset data is a second preset value.
4. The display device of claim 1, wherein the controller is configured to:
acquiring a key frame interval and a frame rate of video data in second media asset data;
If the value of the key frame interval is larger than or equal to the value of the frame rate, determining that the duration of the first audio-video data is the ratio of the key frame interval to the frame rate;
and if the key frame interval is smaller than the frame rate, determining that the duration of the first audio/video data is a first preset duration, wherein the next frame of video data corresponding to the first preset duration is key frame data.
5. The display device of claim 1, wherein the controller executing the downloading of the second asset data, decoding the first audio-video data of the second asset data with the virtual decoder, is further configured to:
downloading the second media asset data and simultaneously recording the duration of downloading the second media asset data;
after the time length of downloading the second media asset data reaches a second preset time length, if the video data in the second media asset data which is downloaded currently is key frame data, the first audio and video data are sent into the virtual decoder so that the virtual decoder decodes the first audio and video data, and the first audio and video data are the second media asset data before the key frame data.
6. The display device of claim 1, wherein the second media asset data is broadcast data, the controller executing the downloading of the second media asset data is further configured to:
And if the video data in the second media asset data is key frame data, starting to download the second media asset data.
7. The display device of claim 1, wherein the display playback module includes a display for displaying video data in the decoded first and second media data and an audio output interface for playing audio data in the decoded first and second media data.
8. A video playing method, comprising:
downloading first media asset data, decoding the first media asset data by using a hardware decoder, and controlling a display playing module to play the decoded first media asset data;
creating a virtual decoder, and identifying a data identifier of the second media asset data; when the data identifier is a first preset identifier, determining that the second media asset data is broadband video data; when the data identifier is a second preset identifier, determining that second media asset data is broadcast data;
if the second media asset data is broadcast data, judging whether the video data of the second media asset data is key frame data or not, and downloading the second media asset data when the video data is key frame data; downloading the second media asset data if the second media asset data is not broadcast data;
Decoding first audio/video data of the second media asset data by using the virtual decoder;
when the first media asset data is played to a first preset time point, stopping decoding the first media asset data by using a hardware decoder, clearing data in the hardware decoder, and controlling the display and play module to play the decoded first audio and video data; the video data of the first media asset data corresponds to the next frame data of the video frame at a first preset time point and is key frame data;
and decoding the second audio/video data of the second media data by using the hardware decoder, and controlling the display playing module to play the decoded second audio/video data after the playing of the first audio/video data is finished.
9. The method of claim 8, wherein the step of creating a virtual decoder comprises:
and when the first media data is played to a second preset time point, creating the virtual decoder, wherein the difference value between the first preset time point and the second preset time point is a first preset value.
10. The method of claim 8, wherein the step of creating a virtual decoder comprises:
and when the first media asset data is played to the target frame media asset data, creating the virtual decoder, wherein the difference value between the frame number of the media asset data corresponding to the first preset time point and the frame number of the target frame media asset data is a second preset value.
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