CN115643427B - Ultra-high-definition audio and video communication method and system and computer readable storage medium - Google Patents
Ultra-high-definition audio and video communication method and system and computer readable storage medium Download PDFInfo
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Abstract
The invention discloses an ultra-high-definition audio and video communication method, an ultra-high-definition audio and video communication system and a computer readable storage medium. The ultra-high-definition audio and video communication system is provided with a self-adaptive hardware coding and decoding module, so that the optimal display card can be automatically selected and used, and the working efficiency is improved; the GPU is used for rendering the image, so that the rendering speed is increased, and a user can watch the 4K ultra-high-definition video smoothly; an optimized picture-in-picture algorithm is adopted to support the high-efficiency scaling and superposition of multiple paths of 4K video streams to form a picture-in-picture, and the requirement of a user on 4K ultra-high definition audio and video communication under various different scenes is met.
Description
Technical Field
The invention relates to the technical field of ultra-high-definition communication, in particular to an ultra-high-definition audio and video communication method, an ultra-high-definition audio and video communication system and a computer readable storage medium.
Background
With the popularization of 5G high-speed networks, the audio and video communication technology develops rapidly, and the functions are changing day by day. The traditional audio and video communication software gradually does not meet the requirements of medium-high-end audio and video communication application due to the problems of definition, resolution, tone quality, image quality and the like. Particularly for a 4K ultra-high definition (namely 4K resolution UltraHD) video communication scene, the existing audio and video communication mode has the problems of slow coding and decoding, frame loss in transmission, great time delay and the like, and can not meet the requirements of various ultra-high definition video communication. Therefore, the development of a method capable of smoothly performing 4K ultra-high-definition audio and video communication is an urgent problem to be solved.
Disclosure of Invention
The technical problem to be solved by the invention is to provide an ultra-high-definition audio and video communication method, a computer readable storage medium storing a computer program for realizing the method when executed, and a system comprising the storage medium, wherein the ultra-high-definition audio and video communication method can maintain clear and smooth 4K ultra-high-definition real-time communication.
The method for ultra-high-definition audio and video communication is provided, and the acquisition, playing and outward transmission of audio and video are realized on the current equipment, and comprises the following steps:
a high-definition audio and video multi-path acquisition step, wherein video data are acquired through multi-path 4K picture acquisition equipment, and audio data are acquired through input audio acquisition equipment;
a format matching step, namely identifying whether the format of the picture of the video data acquired by each of the multi-channel 4K picture acquisition equipment is YUV format, if the picture of the video data is not YUV format, decoding the video data acquired by the corresponding 4K picture acquisition equipment, converting the picture into YUV format through transcoding processing, and then coding, thereby outputting the video data with matched format;
an audio and video synchronization step, namely performing time synchronization processing on the collected video data and audio data to obtain audio and video data; if the frame of the video data is in a non-YUV format in the format matching step, delaying the audio data corresponding to the video data by the total time required by the decoding processing, transcoding processing and encoding processing of the video data in the time synchronization processing;
a picture-in-picture processing step, when the collected audio and video is played on the current equipment, performing pixel superposition processing and zooming processing on the pictures of the video data collected by the 4K picture collecting equipment according to the input operation of a user, and displaying the video data subjected to the pixel superposition processing and the zooming processing in a user-specified area;
and a transmission step, in which the audio and video data subjected to the time synchronization processing are transmitted outwards in a data packet fragment mode, wherein the size of the data packet fragment is inversely related to the quantity of the non-YUV format video data in the format matching step and the quantity of the video data subjected to pixel superposition processing and scaling processing in the picture-in-picture processing step.
Preferably, in the step of acquiring the high-definition audio and video multipath, the 4K image acquisition device comprises a 4K camera and a 4K acquisition card.
Preferably, the picture-in-picture processing step further includes a picture transparency channel adjustment step of enhancing transparency of the multi-layered picture subjected to the pixel superimposition processing, respectively, to realize transparent display of the superimposed picture subjected to the picture-in-picture processing.
Preferably, the picture-in-picture processing step includes an audio matching step executed when picture-in-picture processing is performed on a plurality of audio and video received from the outside, and identifies audio data corresponding to each audio and video picture to obtain a voice identification result; and acquiring a plurality of picture acquisition channels matched with the voice data based on the voice recognition result to perform picture-in-picture processing.
Preferably, the matching of the voice data means that if the voice repeatability reaches a preset degree, a picture collected by the 4K picture collecting device corresponding to the voice data is selected and displayed.
Preferably, the matching of the voice data means that the audio data corresponding to the pictures acquired by the multi-path 4K picture acquisition device have continuity, and picture-in-picture processing of the pictures is forbidden.
Preferably, the audio/video synchronization step includes an audio tag insertion step, and for the audio/video data: acquiring a low-pass amplitude value of an audio frame of audio data at a preset time node as an audio label; and respectively extracting video frames of all the video data at the same preset time node, and respectively embedding the audio tags into the video frames through image compression of discrete cosine transform.
Preferably, the low-pass amplitude as an audio tag means: and sequentially carrying out multi-order processing on the low-pass amplitude to obtain a multi-order matrix, and taking the sequence of all multi-order matrix eigenvalues of the multi-order matrix as an audio tag.
Preferably, the multi-order processing refers to first-order moment processing and second-order moment processing, and the audio tag refers to a sequence of second-order matrix eigenvalues constituting a second-order matrix.
Preferably, the embedding of the audio tags into the video frames respectively refers to: and respectively extracting brightness components of YUV data of preset areas of each video frame, and modifying medium-high frequency coefficients of alternating current components of the brightness components in the discrete cosine transform by using the sequence values of audio labels when image compression processing of the discrete cosine transform is carried out, so that the audio frames are embedded into the video frames.
Preferably, the method comprises an automatic equipment detection step executed before the high-definition audio and video multi-path acquisition step, wherein the automatic equipment detection step comprises camera scanning self-checking and is used for judging whether the acquisition of the preset 4K resolution at the preset frame rate is finished or not; and the microphone scanning self-checking is included, and the recording and playing states of the microphone are identified by recording and playing the recorded audio for comparison.
The ultra-high-definition audio and video communication system comprises a processor, and a plurality of paths of 4K picture acquisition devices and input audio acquisition devices which are respectively communicated with the processor, and further comprises a prestored computer readable storage medium, wherein a computer program on the computer readable storage medium can be executed by the processor.
Has the beneficial effects that: according to the ultrahigh-definition audio and video communication method, the 4K ultrahigh-definition fine video pictures are acquired by the multi-path 4K ultrahigh-definition acquisition equipment, so that the ultrahigh-definition audio and video communication can be realized by a user through the ultrahigh-definition equipment, and clear and efficient communication is realized. The ultra-high-definition audio and video communication system is provided with a self-adaptive hardware coding and decoding module, so that the optimal display card can be automatically selected and used, and the working efficiency is improved; the GPU is used for rendering the image, so that the rendering speed is increased, and a user can watch the 4K ultra-high-definition video smoothly; an optimized picture-in-picture algorithm is adopted to support the high-efficiency zooming and overlaying of the multi-path 4K video streams to form a picture-in-picture, and the requirement of a user on 4K ultra-high-definition audio and video communication under various different scenes is met.
Drawings
Fig. 1 is a flow chart of steps of an ultra high definition audio-video communication method.
Fig. 2 is a logic processing flow diagram of the ultra-high-definition audio and video communication method.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The ultra-high-definition audio and video communication system comprises an automatic equipment detection module, a 4K multi-channel acquisition module, a self-adaptive hardware coding and decoding module, a high-efficiency network transmission module, a rapid cutting display processing module, a multi-platform high-performance rendering module and a picture-in-picture module, wherein each module is respectively connected with a processor and executes a pre-recorded computer program through the processor to realize the functions of each module. The multichannel 4K image acquisition equipment and the input audio acquisition equipment for the ultra-high definition audio and video can be used for a plurality of financial and medical fields such as remote inquiry, video conference, remote account opening and the like, so that a user can experience ultra-high definition audio and video calls, the ultra-high definition audio and video calls are distinguished and fuzzy, the stuck low-image quality is not smoothly experienced, the efficiency of information expression and transmission is effectively improved for the human, the use scene of the audio and video calls is expanded, and the multichannel 4K image acquisition equipment and the input audio acquisition equipment have wide practical values.
The communication process of the 4K ultra-high-definition audio and video communication system is realized by a 4K ultra-high-definition audio and video communication method, which comprises the steps of firstly detecting and guaranteeing the availability of equipment through automatic equipment; secondly, simultaneously acquiring multiple paths of 4K audio and video streams, and carrying out picture-in-picture superposition on the multiple paths of video streams to form a path of video stream; then sending the data to a self-adaptive hardware coding and decoding module for coding, and transmitting the coded data to an opposite receiving end through a high-efficiency network; and finally, the receiving end processes the video data by using a fast cutting display algorithm after decoding, and displays the video through a multi-platform high-performance rendering module. The 4K ultra-high-definition audio and video communication system realizes the acquisition, playing and outward transmission of audio and video on the current equipment, and the specific steps are explained as follows.
An automatic device detection step comprising: the method comprises the steps of camera scanning self-checking, detecting a scanning camera, opening the camera, collecting images, and judging whether the collection of a preset 4K resolution ratio at a preset frame rate is finished or not, so as to evaluate whether the camera is a normal camera or not; the microphone scans and self-tests, automatically plays a piece of music through the external player and records the music, and identifies the recording and playing states of the microphone through recording and playing the recorded audio for comparison so as to judge whether the microphone is normal; and a display card detection step, namely reading the configuration information, selecting the latest display card, and coding and decoding the preset standard data through hardware coding and decoding. The automatic equipment detection step is automatically executed after the system is started, the problem that equipment is abnormal when the system is transacted can be avoided, manual operation is not needed in the detection, and the system is automatic, convenient and quick.
And a high-definition audio and video multi-path acquisition step, wherein video data are acquired through multi-path 4K picture acquisition equipment, and audio data are acquired through input audio acquisition equipment. Preferably, in the step of acquiring the high-definition audio/video multipath, the 4K image acquisition device comprises a 4K camera such as a loose camera, a sony camera, a fluorite camera and a 4K acquisition card such as a round steel camera, a Meilewei camera and a Tian Chuang Hengda camera, and can acquire and acquire video streams in formats such as NV12, YUYV, YUV420P, P010 and RGB 24.
And a format matching step, namely identifying whether the format of the image of the video data acquired by each of the multi-channel 4K image acquisition equipment is YUV format, if the image of the video data is non-YUV format, decoding the video data acquired by the corresponding 4K image acquisition equipment, converting the image into YUV format through transcoding processing, and then coding, thereby outputting the video data with matched format.
Before the system is collected, the format supported by the appointed camera or the 4K collecting card is detected, the YUV format is preferentially adopted, if only the MJPEG format is supported, the collected image is automatically decoded and converted into the YUV format and then is transmitted into the encoding and decoding module; if the acquisition equipment is opened, no error is reported, but the system cannot acquire the audio and video data from the normal acquisition equipment within a period of time, and the audio and video data can also be identified as an error.
The adaptive hardware coding and decoding are realized through the format matching, all the display cards are automatically scanned, and the optimal display card is selected for use. The method for selecting the optimal display card is to transmit preset 4K image data to each display card, perform coding work, decoding work and rendering work for a period of time, and score by detecting the processing speed, so that the optimal display card is selected.
An audio and video synchronization step, namely performing time synchronization processing on the acquired video data and audio data to obtain audio and video data; if the frame of the video data is in the non-YUV format in the format matching step, delaying the audio data corresponding to the video data by the total time required by the decoding processing, the transcoding processing and the encoding processing of the video data in the time synchronization processing.
In this embodiment, the audio/video synchronization step further includes an audio tag insertion step, for audio/video data: acquiring a low-pass amplitude value of an audio frame (such as a frame with real audio data after 10 seconds from the beginning of audio playing) of audio data at a preset time node as an audio label; and respectively extracting video frames of all the video data at the same preset time node, and respectively embedding the audio tags into the video frames through image compression of discrete cosine transform. The audio tags are embedded into all the video frames in a time synchronization mode through the audio tag insertion step, and the problem of asynchrony of sound and pictures caused by transmission can be checked by performing automatic verification of audio and video synchronization after audio and video are transmitted outwards.
Wherein, the low-pass amplitude as the audio label means: and sequentially performing multi-order processing (such as first-order moment processing and second-order moment processing) on the low-pass amplitude to obtain a multi-order matrix (second-order matrix), and taking the sequence of all multi-order matrix eigenvalues (second-order matrix eigenvalues) of the multi-order matrix (second-order matrix) as the audio tag.
Wherein, embedding the audio tags into each video frame respectively means: if three video frames extracted from the video data collected by the three-path 4K picture collecting device exist, the angular point regions of the video frames are respectively taken as the preset regions in a clockwise mode, namely, the brightness components of the YUV data of the upper left angular point, the upper right angular point and the lower right angular point of the three video frames are respectively extracted, so that the audio tags are respectively embedded into the regions of the video frames to be different, and the influence on the picture is small after pixel superposition processing and scaling processing are carried out in the subsequent picture-in-picture processing step.
In the image compression processing of discrete cosine transform, the medium-high frequency coefficient of the alternating current component of the luminance component in the discrete cosine transform is modified by the value of the sequence of the audio tag, thereby embedding the audio frame data in the video frame. The manner of embedding the audio tag into the video frame in this embodiment is the same as the manner of compressing audio and video synchronously in the prior art, and is not described herein again.
And a picture-in-picture processing step, wherein when the collected audio and video is played on the current equipment, the pictures of the video data collected by the plurality of 4K picture collecting equipment are subjected to pixel superposition processing and zooming processing according to the input operation of a user, and the video data subjected to the pixel superposition processing and the zooming processing are displayed in a user-specified area.
The picture-in-picture processing step further comprises a picture transparent channel adjusting step, and the transparency of the multilayer pictures is sequentially enhanced to realize the transparent display of the picture-in-picture superposed pictures. Specifically, after a plurality of 4K pictures are collected, some specified 4K pictures can be scaled and then superimposed on other 4K pictures according to a specified area in a pixel superimposing manner. And through the adjustment to transparent channel, can realize that picture-in-picture stack picture demonstrates transparent effect. In the transparency setting process, multi-layer progressive transparency selection is performed, the bottommost layer is 0, and the topmost layer is sequentially set as follows: when the layer m, the transparency of the layer is 1.m times of the topmost layer to the power of m plus m, so that the ladder setting of the transparency is realized.
In addition, when the video stream is reduced to manufacture a foreground picture, an optimal algorithm for processing image reduction is adopted, and an interpolation method is approached, so that the processing speed is increased. When the foreground and the background are superposed, considering that a semitransparent state is not needed and the resolution of the foreground after the foreground is zoomed is small, an overlay filter such as ffmpeg is not adopted, pixel points of the foreground are traversed, corresponding positions of the background are replaced, a corresponding zooming and superposing algorithm is written by using a NASM assembly language, unnecessary operation instructions are simplified, and the processing speed is increased.
In addition, in the picture-in-picture processing step, an audio matching step executed when picture-in-picture processing is carried out on a plurality of audio and video received from the outside is also included, and audio data corresponding to pictures acquired by each 4K picture acquisition device is identified to obtain a voice identification result; and acquiring a plurality of picture acquisition channels matched with the voice data based on the voice recognition result to perform picture-in-picture processing. If the voice repeatability reaches a preset degree, selecting a picture which is acquired by 4K picture acquisition equipment and corresponds to the voice data to be displayed; if the audio data corresponding to the pictures collected by the multi-channel 4K picture collecting equipment have continuity, picture-in-picture processing of the pictures is forbidden.
And a transmission step, namely transmitting the data packet fragmentation according to the decoding and transcoding quantity in the format matching step and the picture stacking layer number in the picture-in-picture processing step, wherein the more the decoding and transcoding quantity and the picture stacking layer number, the more frequent the data packet fragmentation is. Because the 4K data volume is large, when udp is adopted for transmission, the packet size of the data packet is actively adjusted and the data packet is rapidly transmitted according to the current network state, such as the transmission rate, the receiving rate, the packet loss rate and the MTU limit, so that the increase of the packet loss rate and the transmission delay caused by the transmission of too large fragments of the data packet are avoided.
Preferably, the present embodiment implements screen optimization through a fast cropping display algorithm and multi-platform high-performance rendering. Cutting is carried out before rendering is displayed, a cutting area can be designated, data in the designated area are continuously and quickly extracted according to the storage characteristic of the format of original data yuv420 in a memory, a cutting algorithm is written through a NASM assembly language, and an operation instruction is simplified, so that the cutting effect is quickly achieved. Rendering modes can be automatically switched according to the current system, D3D of WINDOWS can be adopted in a WINDOWS platform, and Opengl can be adopted in trusted systems such as Linux, IOS, android and UOS, and various hardware supporting the API can be directly subjected to bottom layer operation by bypassing a Graphic Display Interface (GDI). And copying the video data in YUV420P and other formats to GPU textures through a D3D interface, and performing high-speed transcoding and rendering by using a shader.
According to the ultrahigh-definition audio and video communication method, the 4K ultrahigh-definition fine video pictures are acquired by the multi-path 4K ultrahigh-definition acquisition equipment, so that the ultrahigh-definition audio and video communication can be realized by a user through the ultrahigh-definition equipment, and clear and efficient communication is realized. The ultra-high-definition audio and video communication system is provided with a self-adaptive hardware coding and decoding module, so that the optimal display card can be automatically selected and used, and the working efficiency is improved; the GPU is used for rendering the image, so that the rendering speed is increased, and a user can watch the 4K ultra-high-definition video smoothly; an optimized picture-in-picture algorithm is adopted to support the high-efficiency zooming and overlaying of the multi-path 4K video streams to form a picture-in-picture, and the requirement of a user on 4K ultra-high-definition audio and video communication under various different scenes is met.
The above embodiments are only embodiments of the present invention, and the scope of protection is not limited thereto. The insubstantial changes or substitutions will now be made by those skilled in the art based on the teachings of the present invention, which fall within the scope of the claims.
Claims (9)
1. An ultra-high-definition audio and video communication method is characterized by comprising the following steps:
a high-definition audio and video multi-path acquisition step, wherein video data are acquired through multi-path 4K picture acquisition equipment, and audio data are acquired through input audio acquisition equipment;
a format matching step, namely identifying whether the format of the image of the video data acquired by each of the multi-channel 4K image acquisition equipment is YUV format, if the image of the video data is non-YUV format, decoding the video data acquired by the corresponding 4K image acquisition equipment, converting the image into YUV format through transcoding processing, and then coding, thereby outputting the video data with matched format;
an audio and video synchronization step, namely performing time synchronization processing on the collected video data and audio data to obtain audio and video data; if the frame of the video data is in a non-YUV format in the format matching step, delaying the audio data corresponding to the video data by the total time required by the decoding processing, transcoding processing and encoding processing of the video data in the time synchronization processing;
a picture-in-picture processing step of performing pixel superposition processing and zoom processing on pictures of video data acquired by the plurality of 4K picture acquisition devices according to input operation of a user, and displaying the video data subjected to the pixel superposition processing and the zoom processing in a user-specified area;
and a transmission step, in which the audio and video data subjected to the time synchronization processing are transmitted outwards in a data packet fragment mode, wherein the size of the data packet fragment is inversely related to the quantity of the non-YUV format video data in the format matching step and the quantity of the video data subjected to pixel superposition processing and scaling processing in the picture-in-picture processing step.
2. The ultra-high-definition audio and video communication method according to claim 1, wherein in the step of multi-path collection of high-definition audio and video, the 4K image collection device comprises a 4K camera and a 4K collection card.
3. The ultra high definition audio/video communication method according to claim 1, wherein the picture-in-picture processing step further includes a picture transparent channel adjustment step of enhancing transparency of the multi-layered picture subjected to the pixel superimposition processing, respectively, to realize transparent display of the superimposed picture subjected to the picture-in-picture processing.
4. The ultra high definition audio/video communication method according to claim 1 or 3, wherein the audio/video synchronization step includes an audio tag insertion step of, for the audio/video data: acquiring a low-pass amplitude value of an audio frame of audio data at a preset time node as an audio label; video frames of all video data are respectively extracted at the same preset time node, the audio tags are respectively embedded into the video frames through image compression of discrete cosine transform, and automatic verification of audio and video synchronization can be carried out after the audio and video data are transmitted outwards to check the problem of asynchrony of sound and pictures caused by transmission.
5. The ultra high definition audio-video communication method according to claim 4, wherein the low pass amplitude as an audio tag means: and sequentially carrying out multi-order processing on the low-pass amplitude to obtain a multi-order matrix, and taking the sequence of all multi-order matrix eigenvalues of the multi-order matrix as an audio tag.
6. The ultra high definition audio-video communication method according to claim 5, wherein embedding the audio tags into each video frame respectively means: and respectively extracting brightness components of YUV data of preset areas of each video frame, and modifying medium-high frequency coefficients of alternating current components of the brightness components in the discrete cosine transform by using the sequence values of audio labels when image compression processing of the discrete cosine transform is carried out, so that the audio frames are embedded into the video frames.
7. The ultra high definition audio/video communication method according to claim 1, comprising an automatic device detection step executed before the high definition audio/video multi-path acquisition step, including a camera scanning self-check, to judge whether the acquisition of a preset 4K resolution at a preset frame rate is completed; and the microphone scanning self-checking is included, and the recording and playing states of the microphone are identified by recording and playing the recorded audio for comparison.
8. Computer-readable storage medium, in which a computer program is stored which, when being executed by a processor, is able to carry out the ultra high definition audio-video communication method according to any one of claims 1~7.
9. Ultra high definition audio-video communication system comprising a processor and a 4K picture acquisition device and an input audio acquisition device in communication with said processor, respectively, characterized by further comprising a computer readable storage medium according to claim 8, the computer program on the computer readable storage medium being executable by the processor.
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