CN115174991A - Display device and video playing method - Google Patents

Display device and video playing method Download PDF

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Publication number
CN115174991A
CN115174991A CN202210746695.2A CN202210746695A CN115174991A CN 115174991 A CN115174991 A CN 115174991A CN 202210746695 A CN202210746695 A CN 202210746695A CN 115174991 A CN115174991 A CN 115174991A
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China
Prior art keywords
data
media asset
asset data
audio
video data
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Granted
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CN202210746695.2A
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Chinese (zh)
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CN115174991B (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 or rendering scenes according to encoded video stream 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 or rendering scenes according to encoded video stream scene graphs
    • H04N21/44008—Processing of video elementary streams, e.g. splicing a video clip retrieved from local storage with an incoming video stream or rendering scenes according to encoded video stream scene graphs involving operations for analysing video streams, e.g. detecting features or characteristics in the video stream
    • 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

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Databases & Information Systems (AREA)
  • Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)

Abstract

Some embodiments of the present application show a display device and a video playing method, where the method includes: downloading the 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 and 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, emptying data in the hardware decoder, and controlling a display playing module to play the decoded first audio and video data; and decoding second audio and video data of the second media asset data by using a hardware decoder, and controlling the display playing module to play the decoded second audio and video data after the playing of the first audio and video data is finished. According to the embodiment of the application, the single-channel decoding platform simulates double-channel decoding, the rapid seamless switching of videos is realized, the user experience is improved, and meanwhile, the hardware cost is reduced.

Description

Display device and video playing method
Technical Field
The present application relates to the field of display device technologies, and in particular, to a display device and a video method.
Background
In a digital television platform, switching of various videos often occurs, for example, advertisements are inserted in the middle of playing of network videos, and the broadband videos are switched to the broadband videos; for example, a TA (Targeted advertisement) application in HbbTV (Hybrid Broadcast Broadband TV) may insert a Targeted advertisement when broadcasting a live Broadcast, which is switching from Broadcast to Broadband video. These above switches are related to the capabilities of the television platform. Because of the particularity of the television, only one video is required to be played, that is, most of the cases, one hardware decoder is enough to be used, and most of the hardware platforms of the current television are single-path decoding. When the videos are switched, one video needs to be stopped playing, the decoder is released, and then the other video can be played again, so that obvious black screen or video stillness can occur in the switching process, and the user experience is poor.
Disclosure of Invention
Some embodiments of the application provide a display device and a video playing method, which simulate dual-channel decoding on a single-channel decoding platform, realize fast seamless switching of videos, improve user experience, and reduce hardware cost.
In a first aspect, some embodiments of the present application provide a display device, 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 playing module to play the decoded first media asset data;
creating a virtual decoder, downloading second media asset data, and decoding first audio and 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, emptying data in the hardware decoder, and controlling the display playing module to play the decoded first audio and video data;
and decoding second audio and video data of the second media asset data by using the hardware decoder, and controlling the display playing module to play the decoded second audio and video data after the playing of the first audio and video data is finished.
In some embodiments, the controller executes the create virtual decoder, further configured to:
and when the first media asset 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 target frame media asset data, creating the virtual decoder, wherein the difference value between the frame number of the media asset data and the frame number of the target frame media asset data corresponding to the first preset time point is a second preset value.
In some embodiments, the controller is configured to:
acquiring key frame intervals and frame rates of video data in the second media asset data;
if the numerical value of the key frame interval is greater than or equal to the numerical value of the frame rate, determining the duration of the first audio/video data as 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 and video data is a first preset duration, and determining that the next frame of video data corresponding to the first preset duration is key frame data.
In some embodiments, the controller performs the downloading of the second media asset data, decoding first audio and video data of the second media asset data with the virtual decoder, and is further configured to:
downloading the second media asset data, and simultaneously recording the time length for downloading the second media asset data;
after the time length for downloading the second media asset data reaches a second preset time length, if the video data in the currently downloaded second media asset data is key frame data, sending the first audio and video data to the virtual decoder so that the virtual decoder decodes the first audio and video data, wherein the first audio and video data is the second media asset data before the key frame data.
In some embodiments, the second asset data is broadcast data, and the controller executes the downloading of the second asset data, and is further configured to:
and if the video data in the second media asset data is the 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, the display is configured to display video data in the decoded first and second media asset data, and the audio output interface is configured to play audio data in the decoded first and 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 playing module to play the decoded first media asset data;
creating a virtual decoder, downloading second media asset data, and decoding first audio and 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, emptying data in the hardware decoder, and controlling the display playing module to play the decoded first audio and video data;
and decoding second audio and video data of the second media asset data by using the hardware decoder, and controlling the display playing module to play the decoded second audio and video data after the playing of the first audio and video data is finished.
In some embodiments, the step of creating a virtual decoder comprises:
and when the first media asset 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 target frame media asset data, creating the virtual decoder, wherein the difference value between the frame number of the media asset data and the frame number of the target frame media asset data corresponding to the first preset time point is a second preset value.
Some embodiments of the present application provide a display device and a video playing method. In the process of playing the first media asset data, the virtual decoder is used for decoding first audio and video data of the second media asset data, namely a 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, data in the hardware decoder is cleared, the hardware decoder is used for decoding second audio and video data of the second media asset data, namely subsequent data of the second media asset data, and after the first audio and video data is played, the second audio and video data is played, so that rapid seamless switching of two videos is achieved, the condition of black screen or static picture in the switching process is avoided, and 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 illustrates a hardware configuration block diagram of the control apparatus 100 according to some embodiments;
fig. 3 illustrates a hardware configuration block diagram of the display apparatus 200 according to some embodiments;
FIG. 4 illustrates a software configuration diagram in the 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; (ii) a
Figure 7 illustrates a variation diagram of a media asset switch provided according to some embodiments;
figure 8 illustrates a variation diagram of a media asset switch 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 diagram of a media asset switch provided according to some embodiments;
FIG. 12 illustrates a variation diagram of network video insertion advertising provided in accordance with some embodiments;
figure 13 illustrates a variation of a broadcast live insertion advertisement provided in accordance with some embodiments.
Detailed Description
To make the purpose and embodiments of the present application clearer, the following will clearly and completely describe the exemplary embodiments of the present application with reference to the attached drawings in the exemplary embodiments of the present application, and it is obvious that the described exemplary embodiments are only a part of the embodiments of the present application, and not all of the embodiments.
It should be noted that the brief descriptions of the terms in the present application are only for convenience of understanding of the embodiments described below, and are not intended to limit the embodiments of the present application. These terms should be understood in their ordinary and customary meaning unless otherwise indicated.
The terms "first" and "second," and the like in the description and claims of this application and in the above-described drawings are used for distinguishing between similar or analogous objects or entities and are not necessarily meant to define a particular order or sequence 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 expressly 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 present application may have various implementation forms, and for example, the display device may be a television, a smart television, a laser projection device, a display (monitor), an electronic whiteboard (electronic whiteboard), 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 apparatus 200 through the smart device 300 or the control device 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 an infrared protocol communication or a bluetooth protocol communication, and other short-distance communication methods, and controls the display device 200 in a wireless or wired manner. The user may input a user instruction through a key on a remote controller, voice input, control panel input, etc., to control the display apparatus 200.
In some embodiments, the smart device 300 (e.g., mobile terminal, tablet, computer, laptop, etc.) may also be used to control the display device 200. For example, the display device 200 is controlled using an application program running on the smart device.
In some embodiments, the display device may not receive instructions using the smart device or control device described above, but may receive user control through touch or gestures, or the like.
In some embodiments, the display device 200 may also be controlled 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 by a module configured inside the display device 200 to obtain a voice command, or may be received by a voice control device provided outside the display device 200.
In some embodiments, the display device 200 is also in data communication with a server 400. The display device 200 may be allowed to be communicatively connected through 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 apparatus 200. The server 400 may be a cluster or a plurality of 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 according to 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, serving as an interaction intermediary between the user and the display device 200.
As shown in fig. 3, the display apparatus 200 includes at least one of a tuner demodulator 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 comprises a processor, a video processor, an audio processor, a graphics processor, a RAM, a ROM, a first interface to an nth interface for input/output.
The display 260 includes a display screen component for presenting a picture, and a driving component for driving image display, a component for receiving an image signal from the controller output, performing display of 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, and a projection display, and may also be a projection device and a projection screen.
The communicator 220 is a component for communicating with an external device or a server 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, and other network communication protocol chips or near field communication protocol chips, and an infrared receiver. The display apparatus 200 may establish transmission and reception of a control signal and a data signal with the external control apparatus 100 or the server 400 through the communicator 220.
A user interface for receiving control signals for controlling the apparatus 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 collecting the intensity of ambient light; alternatively, the detector 230 includes an image collector, such as a camera, which may be used to collect external environment scenes, attributes of the user, or user interaction gestures, or the detector 230 includes a sound collector, such as a microphone, 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, and the like. Or may be a composite input/output interface formed by the plurality of interfaces.
The tuner demodulator 210 receives a broadcast television signal through a wired or wireless reception manner, and demodulates an audio/video signal, such as an EPG data signal, from a plurality of wireless or wired broadcast television signals.
In some embodiments, the controller 250 and the modem 210 may be located in different separate devices, that is, the modem 210 may also be located in an external device of the main device where the controller 250 is located, such as an external set-top box.
The controller 250 controls the operation of the display device and responds to the user's operation through various software control programs stored in the memory. The controller 250 controls the overall operation of the display apparatus 200. For example: in response to receiving a user command for selecting 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 (CPU), a video processor, an audio processor, a Graphic Processing Unit (GPU), a RAM Random Access Memory (RAM), a ROM (Read-Only Memory), a first interface to an nth interface for input/output, a communication Bus (Bus), and the like.
A user may input a user command on 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 receives the user input command by recognizing the sound or gesture through the sensor.
A "user interface" is a media interface for interaction and information exchange between an application or operating system and a user that enables the conversion of the internal form of information to a form acceptable to the user. A common presentation form of a User Interface is a Graphical User Interface (GUI), which refers to a User Interface related to computer operations and displayed in a graphical manner. It may be an interface element such as an icon, a window, a control, etc. displayed in the 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, i.e., an application layer, a middleware layer and a hardware layer from top to bottom.
The Application layer mainly includes common applications on the television and an Application Framework (Application Framework), wherein the common applications are mainly applications developed based on the Browser, such as: HTML5 APPs; and Native APPs (Native APPs);
an Application Framework (Application Framework) is a complete program model, and has all basic functions required by standard Application software, such as: file access, data exchange, and interfaces to use these functions (toolbars, status lists, menus, dialog boxes).
Native APPs (Native APPs) may support online or offline, message push, or local resource access.
The middleware layer comprises various television protocols, multimedia protocols, system components and other middleware. The middleware can use basic service (function) provided by system software to connect each part of an application system or different applications on a network, and can achieve the purposes of resource sharing and function sharing.
The hardware layer mainly comprises an HAL interface, hardware and a driver, wherein the HAL interface is a unified interface for butting all the television chips, and specific logic is realized by each chip. The driving mainly comprises: audio drive, display driver, bluetooth drive, camera drive, WIFI drive, USB drive, HDMI drive, sensor drive (like fingerprint sensor, temperature sensor, pressure sensor etc.) and power drive etc..
In a digital television platform, switching of various videos often occurs, for example, advertisements are inserted in the middle of playing network videos, and the broadband videos are switched to the broadband videos; for example, the TA application in HbbTV can insert targeted advertisements when broadcasting live, which is switching from broadcast to broadband video. These above switches are related to the capabilities of the television platform. Because of the particularity of the television, only one video is required to be played, that is, most of the cases, one hardware decoder is enough to be used, and most of the hardware platforms of the current television are single-path decoding.
In some embodiments, as shown in fig. 5, the first asset data is downloaded, decoded by the hardware decoder and played by the display playing module. In the process of playing the first media asset data, the hardware decoder is occupied by the first media asset data, when the second media asset data is ready to be switched to, the second media asset data is downloaded, the second media asset data can be directly transmitted to the hardware decoder, but at the moment, the hardware decoder still has part of the first media asset data to be decoded, and the second media asset data can be switched to by continuously playing a section of the first media asset 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 display equipment, and the media resource data comprise videos, pictures and the like. The videos include network videos and broadcast live videos.
In some embodiments, as shown in fig. 6, the first asset data is downloaded, decoded by the hardware decoder and played by the display playing module. In the process of playing the first media asset data, the hardware decoder is occupied by the first media asset data, when the first media asset data are ready to be switched to the second media asset data, the playing of the first media asset data is stopped, the decoder is released, namely the first media asset data in the decoder are emptied, the second media asset data are downloaded, the second media asset data are directly transmitted to the hardware decoder, and the second media asset data are played by the display control module after being decoded. In the process from the stop of playing the first asset data to the playing of the second asset data, a black screen state may exist in the display screen at this time, and the changing state is as shown in fig. 7. In the process from the stop of playing the first asset data to the playing of the second asset data, at this time, the display frame may also have a static state of the first asset data frame, and the changing state is shown in fig. 8.
When the videos are switched, the videos cannot be switched from one video to another in time, or the playing of one video needs to be stopped first, and the playing of another video can be restarted only by releasing the decoder, so that an obvious black screen or video is still in the switching process, and the user experience is poor.
In order to solve the above technical problem, the present embodiment provides a display device 200, and the structure and functions of each part of the display device 200 can refer 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, downloading first media asset data, decoding the first media asset data by using a hardware decoder, and controlling the display playing module to play the decoded first media asset data.
In some embodiments, an instruction input by a user to play the first media asset data is received, 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 media asset data includes video data and audio data. The video data is video stream data, and the audio data is audio stream data. In the downloading process, it is necessary to download audio data and video data of one frame in order into the display apparatus 200.
In some embodiments, the video data and the audio data of the first asset 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 asset data is in an encoded format, the display device cannot directly display and play the first media asset data, the first media asset data needs to be sent to a decoder for decoding, and the decoded first media asset data can be played by the display playing module. The decoder includes a hardware decoder and a software decoder. The hardware decoder decodes the video stream by using GPU (Graphics Processing Unit) resources; the software decoder decodes the audio and video data by a software method, namely, the central processing unit undertakes the decoding work.
In some embodiments, the display play module includes a display and an audio output interface. And sending the video data and the audio data of the first media asset data into a hardware decoder. And decoding the video data in the first media asset data by a hardware decoder to obtain decoded video data, sending the decoded video data to a graphic rendering module for processing, and displaying the decoded video data by a display. And decoding the audio data in the first media asset data by a hardware decoder to obtain decoded audio data, 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 purpose of sound and picture synchronization is achieved.
Step S902, a virtual decoder is created, second media asset data are downloaded, and first audio and video data of the second media asset data are decoded by the virtual decoder;
in some embodiments, the virtual decoder is created by a browser in the display device 200. The virtual decoder is essentially a software decoder. The virtual decoder may be created by the browser prior to downloading the second asset data and deleted after it is no longer needed to decode the second asset data. The virtual decoder can exist all the time after being created, and is released after the virtual decoder decodes the media asset 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 just before playing the first media asset data, and download the second media asset data, and decode the first audio/video data of the second media asset data by using the virtual decoder.
In some embodiments, in order to avoid pre-occupation of the virtual decoder, the virtual decoder may be created within a period of time before switching the video, where the period of time may be sufficient for not pre-occupation of the virtual decoder, and may also be sufficient for completing downloading of the first audio and video data of the second media asset data.
In some embodiments, the step of creating a virtual decoder comprises:
and when the first media asset data is played to a second preset time point, creating a virtual decoder, 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 asset 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 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 a playing time point of the first media asset data, or a system time point.
Illustratively, the first media asset data is broadband video, and when the first preset time point is 00.
Illustratively, the first asset data is broadcast video, and given that the first preset time point is 08 am, 30s, the second preset time point is 08 am, 30. When the system time reaches 08 am 30 in the first medium resource data, creating a virtual decoder, downloading the second medium resource data, and when the system time reaches 08 am 30 in the first medium resource data, realizing medium resource data switching. The embodiment of the application takes the system time as reference, and can switch the media asset data at a fixed time in one day.
In some embodiments, the step of creating a virtual decoder comprises:
and when the first media asset data is played to a second preset time length, creating a virtual decoder, 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 asset data switching time point, and the first preset time length and the second preset time length can be directly obtained in application. The first preset time length and the third preset value can be directly obtained in application, and the second preset time length is deduced from the first preset time length and the third preset value.
Illustratively, the first asset data is broadcast video, and the playing time length is recorded after the broadcast data starts to be played, and it can be deduced that the second preset time point is 29 minutes, knowing that the first preset time point is 30 minutes, and the third preset value is 1 minute. And when the first media asset data is played for 29 minutes, a virtual decoder is created, the second media asset data is downloaded, and when the first media asset data is played for 30 minutes, media asset data switching is realized. The embodiment of the application takes the broadcast data playing time length as a reference, and can switch to the second media asset data after a user watches 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 target frame media asset data, creating the virtual decoder, wherein the difference value between the frame number of the media asset data and the frame number of the target frame media asset data corresponding to the first preset time point is a second preset value. The first preset time point corresponds to the frame number of the media asset data and the frame number of the target frame media asset data and can be directly obtained in application, the first preset time point and the second preset value can be directly obtained in application, and the frame number of the target frame media asset data is deduced according to the frame number of the media asset data and the second preset value corresponding to the first preset time point.
Exemplarily, the first media asset data is a broadband video, the known target frame media asset data is the 90 th frame of the video, and the first preset time point is 00.
Illustratively, the first asset data is a broadband video, and when the first preset time point is known as 00.
In some embodiments, when playing the first asset data, the controller calls a switch interface, which includes the time for switching the asset data, the object to be switched (the second asset data), and so on. Before calling the switch interface, loading a resource of an object to be switched, namely downloading second media resource data.
In some embodiments, after the virtual decoder is created, a storage address of 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 a virtual decoder, the controller is further configured to perform the steps of:
judging whether the first frame video data of the second media asset data is key frame data or not;
the key frame is also called an I frame (I frame), also called intra picture (intra picture), and is usually the first frame of each GOP (Group of Pictures), and is appropriately compressed and used as a reference point for random access, so that it can be used as a picture. GOP is a video compression technique used by MPEG. Key frames, which are important frames in interframe compression coding; it is a full frame compressed encoded frame; when decoding, the data of the key frame is only used to reconstruct a complete image; key frames are generated without reference to other pictures.
The second media asset data comprises video data and audio data, and after the video data is downloaded, the video data can be analyzed to judge whether the video data contains the identifier of the key frame data. If the first frame of video data contains the identifier of the key frame data, determining that the first frame of video data is the key frame data; if the first frame of video data does not contain the identifier 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 first audio and video data of the second media asset data.
In some embodiments, the duration of the first audio-video data may be set to be a preset duration, for example, the first audio-video data is audio-video data of the first 2 seconds of the second media asset data, and it needs to be supplemented that the next frame data corresponding to the video data at 2 seconds is key frame data.
In some embodiments, the first audio/video data may be audio/video data with a preset number of frames, for example, the first audio/video data is first 100 frames of video data and first 100 frames of audio data in the second media asset data, and it is to be supplemented that the 101 th frame data is key frame data.
In some embodiments, since the second audio-video data subsequent to 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 combination with the actual situation.
In some embodiments, the step of determining first audio-visual data of the second asset data comprises:
acquiring key frame intervals and frame rates of video data in the second media asset data;
wherein the key frame interval is an interval length of a key frame in the video data. For example: the key frame interval is 60 frames and frame 1 is a key frame, then frame 61, frame 121 … are key frames. The Frame rate (Frame rate) is a frequency at which bitmap images in units of frames continuously appear on the display. For example: the frame rate is 60fps, which indicates that 60 frames of video data can be played in 1 second, and the video data is image data.
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=2.4s of the first audio/video data; the key frame interval is 40 frames, the frame rate is 25fps, and the duration t =40/25=1.6s of the first audio-video data.
And if the key frame interval is smaller than the frame rate, the duration of the first audio and 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.
Illustratively, 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, and the corresponding video data at 2s is the 100 th frame, and the video data at 101 th frame is key frame data.
And if the next frame data of the frame where the first preset time length is located is not the key frame data, continuously downloading and analyzing the second media asset data until the key frame data are identified, and sending the data before the key frame data into the virtual decoder for decoding.
Illustratively, the interval between the key frames is 15 frames, the frame rate is 50fps, the first preset duration is 2 seconds, and after the first audio/video data reaches the first preset duration of 2 seconds, the 101 th frame of video data is not key frame data, it is necessary to continuously determine whether the 102 th frame of video data is key frame data, until it is identified that the 106 th frame of video data is key frame data, the first audio/video data is the first 105 frame of data.
According to the embodiment of the application, the duration of the first audio data is determined through the key frame interval and the frame rate of the video data in the second media asset data, key frame identification is not needed to be carried out on each frame of video data, and the first audio and video data can be conveniently and quickly sent to the virtual decoder.
In some embodiments, the second asset data may be directly transmitted to the virtual decoder after being downloaded, and the second asset data may be stopped from being continuously transmitted to the virtual decoder when the duration of the first audio/video is reached or after a certain frame is downloaded. 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 asset data, the step of determining first audio-video data of the second asset data comprises:
after the time length of the downloaded second media asset data reaches a second preset time length, judging whether video data in the currently downloaded second media asset data is key frame data or not;
if the video data in the currently downloaded second media data is key frame data, determining that the first audio and video data is the second media data before the key frame data;
and if the video data in the currently downloaded second media asset data is not the key frame data, downloading the video data in the next frame of second media asset data, judging whether the video data in the next frame of second media asset data is the key frame data or not until the key frame data is identified, and determining the first audio and video data according to the key frame data.
Illustratively, the second preset duration is 1s. Taking the key frame interval as 60 frames and the frame rate as 25fps as an example, after downloading the second media asset data of 1s, namely downloading 25 frame data, judging whether the downloaded video data is the key frame data, and when identifying that the 61 st frame data is the key frame data, determining that the first audio/video data is the first 60 frame data. Taking the key frame interval as 20 frames and the frame rate as 25fps as an example, after downloading the second media asset data of 1s, namely downloading 25 frames of data, judging whether the downloaded video data is the key frame data or not is started, and when identifying that the 41 th frame data is the key frame data, determining that the first audio and video data is the 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 acquiring the key frame interval and the frame rate of the second media asset data and performing complex calculation, so that the first audio and video data can be conveniently transmitted to the virtual decoder.
And if the first frame of video data in the second media asset data is not the key frame data, continuously identifying whether the next frame of video data is the key frame data or not until the key frame data is identified, and then starting to download the second media asset data.
In some embodiments, after the step of creating a virtual decoder, the controller is further configured to perform the steps of:
judging whether the second media asset data is broadcast data;
the second asset data may be broadband video data or broadcast data. Broadband video data refers to complete video, such as movies, commercials, etc., that can be downloaded from a network for playback. Broadcast data broadcasting is a user's digital television set-top box, digital television receiver, personal computer (pc), mobile device, and other intelligent devices that "push" various data information including digitized audio, video, images, animation, software, and computer files over a digital television broadcast channel. The first frame of video data of the broadband video data is definitely key frame data, and the first frame of video data of the broadcast data is not necessarily key frame data.
In some embodiments, prior to downloading the second asset data, a data identification of the downloaded second asset data may be identified. 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 identifier is 1, determining that the second media asset data is broadband video data; and if the data identification is 0, determining that the second media asset data is broadcast data.
And if the second media asset data is not the broadcast data, starting to download the second media asset data, and determining 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;
and if the video data of the current second media asset data is the key frame data, starting to download the second media asset data, and determining first audio and video data of the second media asset data.
And if the video data of the current second media asset data is not the key frame data, continuously identifying whether the next frame of video data is the key frame data or not, starting to download the second media asset data after the key frame data is identified, and determining the first audio and video data of the second media asset data.
In some embodiments, the video data and the audio data of the first audio-visual data are fed into a virtual decoder. And decoding the video data in the first audio and video data by the virtual decoder to obtain the decoded video data. And decoding the audio data in the first media asset 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 S903, 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, emptying data in the hardware decoder, and controlling the display playing module to play the decoded first audio and video data;
in some embodiments, when the first asset data is played to the first preset time point, the first asset data is stopped being downloaded to the hardware decoder, the first asset data is stopped being decoded by the hardware decoder, and meanwhile, the first asset data is stopped being sent to the display playing module. At this time, the downloaded and un-decoded first asset data may still exist in the hardware decoder, and it is necessary to empty the data in the hardware decoder, or release the currently occupied hardware decoder. 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 playing module, and the display playing module is controlled to play the first audio and video data.
In some embodiments, the video data of the decoded first audio and 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 and 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 asset data corresponds to the next frame data of the video frame at the first preset time point as the key frame data. Therefore, after the second media asset data is played and switched to the first media asset data, 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 second audio and video data of the second media asset data by using the hardware decoder, and controlling the display playing module to play the decoded second audio and video data after the playing of the first audio and video data is finished.
In some embodiments, the video data and the audio data of the second audio and video data are sent to the hardware decoder while the display playing module is controlled to play the decoded first audio and 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 and video data by a hardware decoder to obtain decoded audio data, sending the decoded audio data to an audio output interface after the playing of the first audio and video data is finished, 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 purpose of sound and picture synchronization is achieved.
Fig. 10 is a timing diagram showing components in the apparatus. As shown in fig. 10, the downloading module sends the first media asset data to the hardware decoder, the hardware decoder decodes the first media asset 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 asset data, the downloading module downloads the first audio and video data in the second media asset data, sends the first audio and video data to the virtual decoder, the first audio and video data are decoded by the virtual decoder, the decoding and playing of the first media asset data are stopped when the second media asset data are switched, the hardware decoder is released, the virtual decoder sends the decoded video data to the display for displaying, and the decoded audio data are sent to the audio output interface for playing. When the first audio and video data are played, the downloading module sends the second audio and video data of the downloaded second media asset data to the hardware decoder, the hardware decoder decodes the second audio and video data, the decoded video data are sent to the display to be displayed, and the decoded audio data are sent to the audio output interface to be played.
In the embodiment of the present application, when the playing of the first media asset data is stopped, a part of data in the second media asset data is decoded by the created virtual decoder, so that the switching can be performed at any time, and the switching effect is shown in fig. 11. According to 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 large, 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 A broadband video and broadband video switch
Take the insertion of advertisement in the middle of playing network video as an example. The user inputs the instruction for playing the network video, and the network video is downloaded, decoded and played by the hardware decoder. The virtual decoder is created 10 seconds before the advertisement is inserted, the first 2 seconds of data of the advertisement are downloaded, and the next frame of the 2 seconds corresponding to the video frame is the I frame data. The virtual decoder decodes the first two seconds of advertisement data. And 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 the advertisement. And the next frame of the network video corresponding to the video frame at the advertisement switching point is I frame data. And downloading the network video data 2 seconds after the advertisement switching point 10 seconds before the advertisement is finished, wherein the next frame of the video frame corresponding to 2 seconds is I frame data. The virtual decoder decodes the 2 second network video data. And 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 panel group 1 to panel group 4 … without advertisement insertion. As shown in effect 2 of FIG. 12, when the advertisement is inserted, the network video is played from panel group 1 to panel group 3, then the advertisement panel group 5 and panel group 6 are inserted seamlessly, and the network video is played from panel group 4 … again seamlessly.
Embodiment two switching between broadband video and broadcast live broadcast
Take the example of inserting the targeted advertisement in the 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 a hardware decoder. The virtual decoder is created 10 seconds before the advertisement is inserted, the first 2 seconds of data of the advertisement are downloaded, and the next frame of the 2 seconds corresponding to the video frame is the 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 seamlessly inserts the advertisement. 5 seconds before the end of the advertisement, it is identified whether the video data in channel 1 is I frame data, and if it is, downloading of data of channel 1 is started. If the video data in the channel 1 is not I frame data, the identification of whether the video data of the next frame is I frame data is continued. The virtual decoder decodes the data of channel 1. When the channel 1 switching point is reached, the hardware decoder stops decoding the advertisement, stops playing the advertisement and seamlessly continues playing the content of the channel 1. Channel 1 plays from panel group 1 to panel group 4 … without an inserted advertisement as shown in effect 1 of fig. 13. As shown in the effect 2 in FIG. 13, when the advertisement is inserted, the network video is played from the group 1 to the group 2, then the advertisement group 5 is inserted seamlessly, and then the network video is played from the group 4 … seamlessly.
Embodiment three broadcast live broadcast and broadcast live broadcast switching
Take the example of switching to reserve another channel in advance when watching a certain channel in the broadcast live broadcast. The user, at 16:00 subscribe to channel 2 to view a program. The user is at 15:00 inputs an instruction to turn on channel 2 in the broadcast, and downloads and decodes and plays the content of channel 2 using a hardware decoder. At 15: at time 55, a virtual decoder is created to identify whether the video data in channel 1 is I frame data, and if so, download of the data of channel 1 is started. The virtual decoder decodes the data of channel 1. At arrival 16:00, the hardware decoder stops decoding channel 1 data, stops playing channel 1 data and seamlessly plays the content of channel 2.
Some embodiments of the present application provide a display device and a video playing method, the method is applicable to the display device, the display device includes a display playing module and a controller, the controller is configured to: downloading first media asset data, decoding the first media asset data by using a hardware decoder, and controlling the display playing module to play the decoded first media asset data; creating a virtual decoder, downloading second media asset data, and decoding first audio and 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, emptying data in the hardware decoder, and controlling the display playing module to play the decoded first audio and video data; and decoding second audio and video data of the second media asset data by using the hardware decoder, and controlling the display playing module to play the decoded second audio and video data after the playing of the first audio and video data is finished. According to the embodiment of the application, the single-channel decoding platform simulates double-channel decoding, the rapid seamless switching of videos is realized, the user experience is improved, and meanwhile, the hardware cost is reduced.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and these modifications or substitutions do not depart from the scope of the technical solutions of the embodiments of the present 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, 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 playing module to play the decoded first media asset data;
creating a virtual decoder, downloading second media asset data, and decoding first audio and 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, emptying data in the hardware decoder, and controlling the display playing module to play the decoded first audio and video data;
and decoding second audio and video data of the second media asset data by using the hardware decoder, and controlling the display playing module to play the decoded second audio and video data after the playing of the first audio and video data is finished.
2. The display device of claim 1, wherein the controller executes the create virtual decoder and is further configured to:
and when the first media asset 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 according to 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 target frame media asset data, creating the virtual decoder, wherein the difference value between the frame number of the media asset data and the frame number of the target frame media asset data corresponding to the first preset time point is a second preset value.
4. The display device according to claim 1, wherein the controller is configured to:
acquiring key frame intervals and frame rates of video data in the second media asset data;
if the numerical value of the key frame interval is greater than or equal to the numerical value of the frame rate, determining the duration of the first audio/video data as 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 and video data is a first preset duration, and determining that 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 performs the downloading of the second media asset data, decoding first audio and video data of the second media asset data with the virtual decoder, and is further configured to:
downloading the second media asset data, and simultaneously recording the time length for downloading the second media asset data;
after the time length for downloading the second media asset data reaches a second preset time length, if the video data in the currently downloaded second media asset data is key frame data, sending the first audio and video data to the virtual decoder so that the virtual decoder decodes the first audio and video data, wherein the first audio and video data is the second media asset data before the key frame data.
6. The display device of claim 1, wherein the second asset data is broadcast data, and wherein the controller performs the downloading of the second asset data, and is further configured to:
and if the video data in the second media asset data is the key frame data, starting to download the second media asset data.
7. The display device of claim 1, wherein the display playing module comprises a display and an audio output interface, the display is configured to display video data in the decoded first asset data and the decoded second asset data, and the audio output interface is configured to play audio data in the decoded first asset data and the decoded second asset data.
8. A video playback method, comprising:
downloading first media asset data, decoding the first media asset data by using a hardware decoder, and controlling the display playing module to play the decoded first media asset data;
creating a virtual decoder, downloading second media asset data, and decoding first audio and 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, emptying data in the hardware decoder, and controlling the display playing module to play the decoded first audio and video data;
and decoding second audio and video data of the second media asset data by using the hardware decoder, and controlling the display playing module to play the decoded second audio and video data after the playing of the first audio and video data is finished.
9. The method of claim 8, wherein the step of creating a virtual decoder comprises:
and when the first media asset 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 target frame media asset data, creating the virtual decoder, wherein the difference value between the frame number of the media asset data and the frame number of the target frame media asset data corresponding to the first preset time point is a second preset value.
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