CN114786060A - Method and device for realizing frame rate control based on wireless screen projection of android platform - Google Patents
Method and device for realizing frame rate control based on wireless screen projection of android platform Download PDFInfo
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- CN114786060A CN114786060A CN202210186719.3A CN202210186719A CN114786060A CN 114786060 A CN114786060 A CN 114786060A CN 202210186719 A CN202210186719 A CN 202210186719A CN 114786060 A CN114786060 A CN 114786060A
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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
- H04N21/4402—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 reformatting operations of video signals for household redistribution, storage or real-time display
- H04N21/440281—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 reformatting operations of video signals for household redistribution, storage or real-time display by altering the temporal resolution, e.g. by frame skipping
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F21/00—Security arrangements for protecting computers, components thereof, programs or data against unauthorised activity
- G06F21/70—Protecting specific internal or peripheral components, in which the protection of a component leads to protection of the entire computer
- G06F21/82—Protecting input, output or interconnection devices
- G06F21/84—Protecting input, output or interconnection devices output devices, e.g. displays or monitors
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/14—Digital output to display device ; Cooperation and interconnection of the display device with other functional units
- G06F3/1454—Digital output to display device ; Cooperation and interconnection of the display device with other functional units involving copying of the display data of a local workstation or window to a remote workstation or window so that an actual copy of the data is displayed simultaneously on two or more displays, e.g. teledisplay
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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
- H04N21/4402—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 reformatting operations of video signals for household redistribution, storage or real-time display
- H04N21/440218—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 reformatting operations of video signals for household redistribution, storage or real-time display by transcoding between formats or standards, e.g. from MPEG-2 to MPEG-4
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Abstract
The invention discloses a method and a device for realizing frame rate control based on wireless screen projection of an android platform, wherein the method comprises the steps of applying for android screen recording permission to record a screen; establishing a view window by using an encoder, transmitting data for producing a screen recording to the view window, acquiring the data of the view window by using a monitoring interface, and setting the view window; creating a virtual display through the screen recording to capture the data content of the view window; starting a thread driving view window to acquire data frame by frame, and calculating a frame data interval time value to change the appointed acquisition frame rate; and transmitting the acquired data frame to a screen projection receiving end for decoding. The invention avoids the problems of overlarge decoding pressure and low efficiency of a decoder at the receiving end caused by fixed multi-path screen projection frame rate by dynamically calculating the frame rate which best meets the decoding efficiency of the receiving end.
Description
Technical Field
The invention relates to the technical field of multi-split screen projection, in particular to a method and a device for realizing frame rate control based on wireless screen projection of an android platform.
Background
At present, the multi-split screen scene of screen projection is used widely, but the multi-split screen projection can cause the decoding pressure at the receiving end to be too large to cause the decoding problem, such as the problems of screen splash, messy codes and the like. The mode of fixing the frame rate in multi-split screen projection can increase the decoding pressure of a projection screen receiving end under the condition of multiple paths, the decoding efficiency is low, a series of conditions of screen splash, code messiness, frame loss and the like are easily caused in video decoding, and even the decoder is possibly crashed to cause equipment restart.
Disclosure of Invention
The invention aims to provide a method and a device for realizing frame rate control based on wireless screen projection of an android platform, which can solve the problems that in the prior art, the frame rate fixing mode can increase the decoding pressure of a screen projection receiving end under the condition of multiple paths and is high in efficiency.
The purpose of the invention is realized by the following technical scheme:
in a first aspect, the present invention provides a method for implementing frame rate control based on wireless screen projection of an android platform, including the following steps:
applying for android screen recording permission to record the screen;
a view window is created by using an encoder, and data for producing a screen recording is transmitted to the view window, so that a monitoring interface acquires the data of the view window and the view window is set;
creating a virtual display through screen recording to capture the data content of the view window;
starting a thread driving view window to acquire data frame by frame, and calculating a frame data interval time value to change the appointed acquisition frame rate;
and transmitting the acquired data frame to a screen projection receiving end for decoding.
Further, before the step of creating a virtual display through screen recording to capture the data content of the view window, the method further comprises:
preparing an intermediate interface layer;
creating an interconnected instance of the rendering texture, the surface texture, and the view window using the intermediate interface layer;
and acquiring the data content of the view window at the intermediate interface layer.
Further, the creating a virtual display through screen recording to capture the data content of the view window specifically includes creating a virtual display through screen recording to capture the data content of the view window in the intermediate interface layer.
Further, the intermediate interface layer is EGL; the EGL specifically realizes the communication between EGLContext and EGLSurface by utilizing EGLContext and EGLSurface supporting pbuffer.
Further, the setting of the view window includes setting of a width-to-height ratio of the view window and setting of the FPS.
Furthermore, the calculation mode of the frame data interval time is 1000/fps.
Further, the transmission of the acquired data frame to the screen projection receiving end is specifically that the acquired data frame is transmitted to the screen projection receiving end through a Transmission Control Protocol (TCP).
In a second aspect, the present invention provides an apparatus for implementing frame rate control based on wireless screen projection of an android platform, including:
the screen recording request unit is used for applying the android screen recording authority to record the screen;
the encoding unit is used for creating a view window, transmitting data for producing the screen recording to the view window, realizing that the monitoring interface acquires the data of the view window, and setting the view window;
a virtual display unit for capturing data content of a view window;
the thread driving unit is used for acquiring data frame by frame for the view window and calculating a frame data interval time value to change the appointed acquisition frame rate;
and the transmission unit is used for transmitting the acquired data frames to the screen projection receiving end for decoding.
Further, the device for realizing frame rate control based on the wireless screen projection of the android platform further comprises:
a preparation unit for preparing an intermediate interface layer;
a creation/connection unit for creating an interconnected instance of the rendering texture, the surface texture and the view window using the intermediate interface layer;
and the acquisition unit is used for acquiring the data content of the view window at the intermediate interface layer.
In a third aspect, the present invention provides a storage medium, where a computer program is stored in the storage medium, and after the computer program is run, the method for implementing frame rate control based on wireless screen projection of an android platform may be implemented.
The invention has the beneficial effects that:
the invention is based on an android platform, a virtual display is created by mediaproject, then video data at a sending end is sent to a Surface (view window) to carry out frame-by-frame data to control the frame rate, when multiple screens are projected, the frame rate which is most in line with the decoding efficiency of a receiving end is dynamically calculated, and a series of problems caused by overlarge decoding pressure of a decoder at the receiving end due to fixed frame rates of the multiple screens are avoided.
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In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the prior art descriptions will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a schematic flow chart of an embodiment of a method for implementing frame rate control based on wireless screen projection of an android platform;
FIG. 2 is a schematic flow chart of the whole method for realizing frame rate control based on wireless screen projection of an android platform;
fig. 3 is a schematic diagram of the composition of the intermediate interface layer EGL.
Detailed Description
The embodiments of the present disclosure are described in detail below with reference to the accompanying drawings.
The embodiments of the present disclosure are described below with specific examples, and other advantages and effects of the present disclosure will be readily apparent to those skilled in the art from the disclosure of the present disclosure. It is to be understood that the embodiments described are only a few embodiments of the present disclosure, and not all embodiments. The disclosure may be carried into practice or applied to various other specific embodiments, and various modifications and changes may be made in the details within the description and the drawings without departing from the spirit of the disclosure. It is to be noted that the features in the following embodiments and examples may be combined with each other without conflict. All other embodiments, which can be derived by a person skilled in the art from the embodiments disclosed herein without inventive step, are intended to be within the scope of the present disclosure.
Referring to fig. 1 to fig. 3, in an embodiment of a method for implementing frame rate control based on wireless screen projection of an android platform according to the present invention, taking mediaproject of the android platform as an example, the method includes the following steps:
and step S1, applying for mediaproject permission of the android recording screen to record the screen.
A screen recording is performed using mediaproject of the android platform, which is a new means of screen capture or recording that can be used to capture the screen, or a permission APP to have the ability to capture the screen or record the system audio.
Step S2, creating a view window createInputSurface (hereinafter referred to as Surface) by using the encoder MediaCodec, and transmitting the data for producing the recording screen to the view window Surface, so as to realize the monitoring interface Surface texture.
Step S3, creating a virtual display createVirtualDisplay through recording mediaproject to capture the data content of the view window Surface.
And step S4, starting the thread driving view window Surface to acquire data frame by frame, and calculating the interval time value of the frame data to change the appointed collection frame rate.
And S5, transmitting the acquired data frame to a screen projection receiving end for decoding.
The screen projection receiving end only needs to be responsible for decoding, and the frame rate can be dynamically adjusted according to the number of the screen projection receiving end devices, so that the multi-path screen projection normal playing is achieved.
Further, in another embodiment of the method for implementing frame rate control based on wireless screen projection of android platform, before creating a virtual display to capture data content of a view window by recording mediaproject, the method further includes:
preparing an intermediate interface layer EGL;
creating an interconnection instance of a rendering texture TextureRender, a Surface texture and a view window Surface by using an intermediate interface layer;
and acquiring the data content of the view window at the intermediate interface layer, wherein the data content of the view window is interpreted as EGL Surface.
Specifically, the creating of the virtual display through the screen recording to capture the data content of the view window specifically includes creating the virtual display through the screen recording to capture the data content of the view window in the intermediate interface layer.
Specifically, the intermediate interface layer is EGL; the EGL specifically realizes the communication between EGLContext and EGLSurface by utilizing EGLContext and EGLSurface supporting pbuffer.
OpenGL ES defines an API for rendering graphics, but does not define a windowing system, in order for GLES to be able to fit various platforms, GLES will be used in conjunction with a library that knows how to create and access windows via the operating system, called EGL for android; while use on a particular device requires an intermediate layer for adaptation, this intermediate layer is the EGL.
EGL provision mechanisms include: communicate with the native windowing system of the device, query available types and configurations of drawing surfaces, create drawing surfaces, synchronize rendering between OpenGL ES and other graphics rendering APIs, and manage rendering resources such as texture maps.
In order for OpenGL ES to be able to draw on current devices, EGL is required to serve as a bridge between OpenGL ES and the devices.
Wherein display (EGLDisplay) is an abstraction of the actual display device; surface (EGLSurface) is the memory area for storing image.
Specifically, the setting of the view window includes setting of a width-to-height ratio of the view window and setting of the FPS.
The setting of the wide high proportion is properly adjusted in combination with the actual multi-way projection condition and view watching; the FPS settings are adjusted according to the comfort of viewing and in conjunction with the actual situation.
Preferably, the frame data interval time is calculated in a manner of 1000/fps. Namely:
video_interval＝1000/fps；
preferably, the transmission of the acquired data frame to the screen projection receiving end is specifically to transmit the acquired data frame to the screen projection receiving end through a Transmission Control Protocol (TCP).
In a second aspect, the present invention provides an apparatus for implementing frame rate control based on wireless screen projection of an android platform, including:
the screen recording request unit is used for applying android screen recording authority to record screens;
the encoding unit is used for creating a view window and transmitting data for producing the screen recording to the view window, so that a monitoring interface can acquire the data of the view window and carry out view window setting;
a virtual display unit for capturing data content of a view window;
the thread driving unit is used for acquiring data frame by frame for the view window and calculating a frame data interval time value to change the appointed acquisition frame rate;
and the transmission unit is used for transmitting the acquired data frames to the screen projection receiving end for decoding.
It should be noted that the screen projection receiving end may be an all-in-one machine, but is not limited thereto, and is a device capable of implementing a display function, a receiving function, and a decoding function.
Specifically, the device for realizing frame rate control based on the wireless screen projection of the android platform further comprises:
a preparation unit for preparing an intermediate interface layer;
the middle interface layer is EGL; the EGL specifically realizes the communication between EGLContext and EGLSurface by utilizing EGLContext and EGLSurface supporting pbuffer.
A creation/connection unit for creating an interconnected instance of a rendering texture, a surface texture and a view window using the intermediate interface layer; in the present embodiment, the intermediate interface layer EGL creates an interconnected instance of the rendering texture TextureRender, the Surface texture, and the view window Surface.
And the acquisition unit is used for acquiring the data content of the view window at the intermediate interface layer.
In a third aspect, the present invention provides a storage medium, where a computer program is stored in the storage medium, and after the computer program is run, the method for implementing frame rate control based on wireless screen projection of an android platform may be implemented.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one position, or may be distributed on multiple network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit may be implemented in the form of hardware, or may also be implemented in the form of a software functional unit.
The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solutions of the present application, which are essential or part of the technical solutions contributing to the prior art, or all or part of the technical solutions, may be embodied in the form of a software product, which is stored in a storage medium and includes several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods described in the embodiments of the present application. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a read-only memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and the like.
The above description is for the purpose of illustrating embodiments of the invention and is not intended to limit the invention, and it will be apparent to those skilled in the art that any modification, equivalent replacement, or improvement made without departing from the spirit and principle of the invention shall fall within the protection scope of the invention.
Claims (10)
1. The method for realizing frame rate control based on wireless screen projection of an android platform is characterized by comprising the following steps of:
applying for android screen recording permission to record the screen;
establishing a view window by using an encoder, transmitting data for producing a screen recording to the view window, acquiring the data of the view window by using a monitoring interface, and setting the view window;
creating a virtual display through the screen recording to capture the data content of the view window;
starting a thread driving view window to acquire data frame by frame, and calculating a frame data interval time value to change the appointed acquisition frame rate;
and transmitting the acquired data frame to a screen projection receiving end for decoding.
2. The method for implementing frame rate control based on android platform wireless screen projection of claim 1, wherein before creating a virtual display by screen recording to capture data content of a view window, the method further comprises:
preparing an intermediate interface layer;
creating an interconnected instance of the rendering texture, the surface texture, and the view window using the intermediate interface layer;
and acquiring the data content of the view window at the intermediate interface layer.
3. The android platform-based wireless screen projection frame rate control method of claim 2, wherein the creating a virtual display through screen recording to capture the data content of the view window specifically comprises creating a virtual display through screen recording to capture the data content of the view window in the intermediate interface layer.
4. The android platform-based wireless screen projection frame rate control method of claim 2, wherein the intermediate interface layer is an EGL; the EGL specifically realizes the communication between EGLContext and EGLSurface by utilizing EGLContext and EGLSurface supporting pbuffer.
5. The method for realizing frame rate control based on android platform wireless screen projection of claim 1, wherein the performing of view window setting comprises setting of aspect ratio and FPS of view window.
6. The method for realizing frame rate control based on android platform wireless screen projection of claim 1, characterized in that the frame data interval time is calculated in a manner of 1000/fps.
7. The method for realizing frame rate control based on android platform wireless screen projection according to claim 1, characterized in that the transmission of the acquired data frame to the screen projection receiving end is specifically that the acquired data frame is transmitted to the screen projection receiving end through a TCP.
8. The utility model provides a device based on wireless screen projection of tall and erect platform of ann realizes frame rate control which characterized in that includes:
the screen recording request unit is used for applying android screen recording authority to record screens;
the encoding unit is used for creating a view window and transmitting data for producing the screen recording to the view window, so that a monitoring interface can acquire the data of the view window and carry out view window setting;
a virtual display unit for capturing data content of a view window;
the thread driving unit is used for acquiring data frame by frame for the view window and calculating a frame data interval time value to change the specified acquisition frame rate;
and the transmission unit is used for transmitting the acquired data frame to a screen projection receiving end for decoding.
9. The device for realizing frame rate control based on the android platform wireless screen projection of claim 8, further comprising:
a preparation unit for preparing an intermediate interface layer;
a creation/connection unit for creating an interconnected instance of the rendering texture, the surface texture and the view window using the intermediate interface layer;
and the acquisition unit is used for acquiring the data content of the view window at the intermediate interface layer.
10. A storage medium, wherein a computer program is stored in the storage medium, and the method for implementing frame rate control based on android platform wireless screen projection according to any one of claims 1 to 7 is implemented after the computer program is run.
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