CN109379556B - Audio and video system based on business processing basic unit and working method thereof - Google Patents
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Abstract
The invention discloses an audio and video system based on a business processing basic unit and a working method thereof, wherein audio and video input and output equipment is adopted to input and output audio and video signals; the system Ethernet switch is adopted to realize the network interconnection among all devices in the audio and video system; the method comprises the following steps that a service processing basic unit is adopted to carry out coding and decoding processing and video fusion processing on video signals and audio signals, and the coded audio signals and the coded video signals are transmitted and received by adopting a distributed Ethernet switching architecture and a data communication interface with a unified format; a control terminal is adopted to remotely configure and manage working parameters of corresponding service processing basic units through an Ethernet interface, and all audio and video resources in the audio and video system are scheduled and managed; therefore, fine-grained decomposition of basic functions is carried out on related services and applications of the audio and video system, remote online configuration of a bottom layer software application mode and an audio and video hardware working mode is achieved through the control terminal, and flexibility and expandability of the audio and video system and deep customization capability aiming at comprehensive application are improved.
Description
Technical Field
The invention relates to the technical field of audio and video transmission and processing, in particular to an audio and video system based on a service processing basic unit and a working method thereof.
Background
In recent years, with the rapid development of modern audio and video processing technology and network communication technology, the application scale of audio and video service processing is getting larger and more complex, and the functions are also getting more and more complex. The audio and video system can provide integration capability aiming at video conference resources, video monitoring resources, voice telephone resources and data resources of different levels of different regions and different mechanisms for users, thereby meeting diversified audio and video application requirements. The current audio and video transmission and processing technology gradually presents the characteristics of distribution and digitization, the application complexity and the function integration capability of an audio and video system are required to be higher and higher, and especially the requirements of services such as cooperative office, video conference, security monitoring, video command scheduling and the like on uniform resources and integration application become the mainstream trend of the current video system industry development.
The traditional audio and video system usually adopts special equipment with relatively single function to realize the audio and video processing function, and as the service processing capability of the equipment is closely coupled with the system application mode, technical personnel need to deploy the equipment in advance, not only the bottom layer configurable capability is deficient, but also the openness degree to upper layer users is limited, so that the flexibility, the expandability and the compatibility to various functions of the audio and video system in the later application have certain limitations.
At present, domestic and abroad, aiming at the application and research related to the flexibility and expandability of the audio and video system, the scheme of optimizing the application architecture of the audio and video system by a software means is mainly focused, for example, a method for rapidly deploying a container of a self-adaptive video transmission system is disclosed in the patent number: CN201610318441.5, which proposes a method for performing modular classification and encapsulation on a video transmission system by using a Docker container, and storing the container in a cloud for atomic call of system application software; in "a video-related task-flow scheduling method" (CN201410242873.3), it is also proposed to perform atomic service division on video services according to types, and upper-layer system applications combine the atomic services according to different service requirements. The method mainly aims at improving the flexibility and expansibility of upper-layer service application software, lacks optimization and management of bottom-layer audio and video processing hardware resources, and is limited by the openness degree of equipment firmware to the upper-layer software, so that the configuration operation of hardware working parameters can not be realized deeply, and the performance of the hardware is difficult to be fully exerted.
The Zhongxing communication is in a 'method and a system for integrating cluster communication and video monitoring' (CN201310022514.8), and dynamically manages video sessions by carrying out position information of monitored equipment, associated user information and equipment group information. The method customizes the camera hardware added with positioning information and user information aiming at a specific scene, is only suitable for the field of video monitoring, and has limited universality, configurability and expandability of the system.
Disclosure of Invention
In view of this, the present invention provides an audio/video system based on a service processing basic unit and a working method thereof, which can improve the flexibility and expandability of the audio/video system and the deep customization capability for comprehensive applications.
An audio and video system based on a service processing basic unit comprises a control terminal, audio and video input and output equipment, a system Ethernet switch and a plurality of service processing basic modules, wherein the service processing basic unit is connected with the audio and video input and output equipment through an input and output interface, and the service processing basic units are all interconnected with the control terminal through Ethernet; wherein the content of the first and second substances,
the audio and video input and output device is used for executing input and output of audio and video signals;
the system Ethernet switch realizes network interconnection among all devices in the audio and video system;
the business processing basic unit is used for carrying out coding and decoding processing and video fusion processing on the video signals and the audio signals, and transmitting and receiving the coded audio signals and the coded video signals by adopting a distributed Ethernet switching architecture and a data communication interface with a uniform format;
the control terminal is used for remotely configuring and managing working parameters of the corresponding service processing basic unit through the Ethernet interface and scheduling and managing all audio and video resources in the audio and video system.
A working method of an audio and video system based on a business processing basic unit comprises the following steps:
establishing an address mapping table of all online service processing basic units in the audio and video system at the control terminal, and updating and maintaining in real time according to the newly added audio and video stream sending port;
receiving human-computer interaction operation control of an audio and video service system operation software interface on video picture layout and audio data resources, and generating corresponding configuration management requirements according to the human-computer interaction operation control;
calling a control logic middleware software interface according to the configuration management requirement, converting the control logic middleware software interface into a working parameter related to audio and video processing, and finally generating a corresponding command word in a JSON format;
respectively searching IP and PORT of a target service processing basic unit to be configured according to the address mapping table, and calling an Ethernet communication interface to send the generated command word to the target service processing basic unit;
and after receiving the JSON command words related to the business processing basic unit, the business processing basic unit analyzes and extracts the working parameters related to audio and video processing, and calls a local audio control parameter API interface and a video control parameter API interface to realize the parameter configuration function so as to complete the scheduling management of the system on the audio and video resources.
The audio and video system based on the service processing basic unit and the working method thereof decompose the related services and applications of the audio and video system into the basic functions of fine-grained video coding and decoding, video transmission and video fusion processing by analyzing, summarizing and integrating the related services and applications of the audio and video system, design the configurable, quantifiable and universal service processing basic unit by adopting a mode of combining software and hardware, realize the remote online configuration of a bottom layer software application mode and an audio and video hardware working mode by a control terminal, and improve the flexibility and expandability of the audio and video system and the deep customization capability aiming at the comprehensive application. The invention is suitable for the application fields of video conferences, video command scheduling and security monitoring, supports standard definition, HD and 4K video formats, adopts the service processing basic unit with standardized design, reduces the coupling between a system frame and a hardware platform, facilitates the seamless upgrade of the later service processing basic unit under the condition of keeping an application interface and a logic control interface unchanged, and improves the overall performance of an audio and video system.
Drawings
Fig. 1 is a structural diagram of an audio/video system based on a service processing basic unit according to the present invention;
FIG. 2 is a logical block diagram of a business processing infrastructure element of the present invention;
FIG. 3 is a diagram of the business process infrastructure software components;
FIG. 4 is an illustration of the JSON format of the control logic interface;
fig. 5 is a work flow chart of the work method of the audio and video system based on the service processing basic unit.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the present invention more apparent, the present invention will be further described in detail with reference to the accompanying drawings and embodiments, it being understood that the specific embodiments described herein are merely illustrative of the present invention and are not intended to limit the present invention.
The invention provides an audio and video system based on a service processing basic unit, which comprises a control terminal, audio and video input and output equipment, a system Ethernet switch and a plurality of service processing basic modules, wherein the service processing basic unit is connected with the audio and video input and output equipment through an input and output interface, and the service processing basic units are all interconnected with the control terminal through Ethernet.
The audio and video input and output device is used for inputting and outputting audio and video signals, the audio and video input and output device comprises but is not limited to a camera, a headset, a sound box, a display screen and the like, and preferably, the audio and video input and output device is connected with the service processing basic unit through an HDMI or I2S interface.
The business processing basic unit is used for carrying out coding and decoding processing and video fusion processing on the video signals and the audio signals, and transmitting and receiving the coded audio signals and the coded video signals by adopting a distributed Ethernet switching architecture and a data communication interface with a unified format. As shown in fig. 2, the service processing basic unit includes an audio/video encoding functional unit, an audio/video decoding and fusing functional unit, and an internal switching functional unit; the audio and video coding functional unit is used for collecting video signals and audio signals and coding audio and video hardware; the audio and video decoding and fusing functional unit is used for receiving the far-end video stream and the audio stream from the Ethernet and decoding the audio and video hardware; the internal exchange function unit is used for providing a distributed Ethernet exchange architecture and a data communication interface connection with a unified format for the audio and video coding function unit and the audio and video decoding fusion function unit, and the audio and video coding function unit, the audio and video decoding fusion function unit and the internal exchange function unit are all connected by adopting the distributed Ethernet exchange architecture and the data communication interface connection with the unified format, so that the audio and video system has good loose coupling characteristics and extensible capability. The audio and video coding functional unit is connected with the audio and video input and output equipment through an input and output interface.
Specifically, the audio/video coding function unit is connected with an audio acquisition device (such as a microphone) through an I2S input interface, and is connected with a video acquisition device (such as a camera and a host video input source) through an HDMI input interface, the audio/video coding function unit adopts an embedded processor (such as a Hi3519 embedded processor) supporting video coding, and realizes the acquisition of 2-channel video signals and 1-channel audio signals and the audio/video hardware coding function through an on-chip graphics processing unit, and finally generates video streams in an h.264 format and audio stream data in a g.711 format, and sends the video streams and the audio stream data to an audio/video system through an ethernet by adopting a multicast protocol.
The audio and video decoding and fusing functional unit is connected with a video output device (such as a display) through an HDMI output interface and is connected with an audio output device (such as a sound box and an earphone) through an I2S output interface; the audio and video decoding and fusing functional unit adopts an embedded processor (such as a Hi3536 embedded processor) supporting video decoding, realizes a hardware decoding function of receiving far-end video streams and audio streams from the Ethernet, simultaneously realizes the fusion processing functions of splicing, multilayer overlapping, zooming and transparency setting of at most 4 paths of videos, and finally outputs the videos to a display and a sound box through a 2-path HDMI output interface and a 1-path I2S output interface respectively.
The internal exchange function unit adopts eight-port Ethernet exchange chips (such as BCM53118 chips) to provide Ethernet interconnection interfaces between the audio and video coding function unit and the audio and video decoding fusion function unit and provide external Ethernet interconnection interfaces for the service processing basic unit.
The service processing basic unit is stacked and cascaded through the system Ethernet switch, and is grouped to form a service processing basic unit cluster, so that when the performance of the audio and video input and output equipment exceeds the processing capacity of a single service processing basic unit in an application occasion, the internal connection relation and the external connection of the service processing basic unit cluster are both Ethernet distributed architecture. For example, a single service processing basic unit can execute the functions of input acquisition of 1-path audio signal and 2-path video signal, ethernet transmission, multi-path audio/video coding and decoding, audio/video signal output and 4-path video fusion processing (such as splicing, multilayer superposition, scaling and transparency setting), when the requirements of the audio/video input/output equipment on the number of interfaces and the video processing performance exceed the processing capacity of the single service processing basic unit, if 5-path video source layered superposition processing is required to be provided or 8-path splicing screen interface output capacity is required to be supported, stacking and cascading can be performed through ethernet exchange, and a service processing basic unit cluster is formed in a grouping manner, so that the input/output equipment at the terminal in the audio/video system exceeds the processing capacity of the single service processing basic unit, such as 8-path, 16-path video acquisition, an MXN splicing screen controller, An application scene of 8-channel video superposition equipment; the internal connection relation and the external connection of the service processing basic unit cluster are both Ethernet distributed architecture.
As shown in fig. 3, the audio/video coding function unit and the audio/video decoding fusion function unit onboard the service processing base unit are both designed by combining software and hardware, and operate an embedded Linux operating system, so that a driving interface for underlying hardware and an operation interface function library for audio/video coding/decoding parameters are realized, and a data communication interface in a unified format, specifically, an audio stream data software interface, a video stream data software interface and a command control software interface, is provided to the outside through an ethernet.
The audio stream data software interface is uniformly transmitted by adopting G.711 format coding, the initial audio port is 3050, the control terminal dynamically allocates the audio ports to the service processing basic units according to the ascending sequence, and the audio and video coding functional unit of each service processing basic unit allocates two paths of audio streams at most, namely 2 ports, so that the parallel output capacity of different ports of multi-code stream audio is supported.
The video stream data software interface is uniformly coded based on an H264 format, an initial audio port of the video stream data software interface is 3060, the control terminal dynamically allocates the audio ports to the service processing basic units according to the ascending sequence, and the audio and video coding function unit of each service processing basic unit is allocated with 4 video ports at most, so that the parallel output capability of different ports of multi-code stream videos is supported.
The command control software interface adopts JSON format network command word coding to realize the sending, stopping, input window coding range, output window position, output window size, lamination sequence, transparency, multi-code stream port distribution and audio and video coding parameter configuration capability of audio and video stream, and the network communication port is 3800 and is designed separately from the audio and video data communication port.
The control terminal is used for remotely configuring and managing working parameters of the corresponding service processing basic unit through the Ethernet interface and scheduling and managing all audio and video resources in the audio and video system. The control terminal comprises a management service module and a system application software interface module; the management service module is used for monitoring all online business processing basic units in the current audio and video system in real time and managing ports; the system application software interface module is used for calling a control logic middleware software interface, converting the audio/video input/output interface layout effect and the man-machine interaction operation into the working parameters of the relevant service processing basic unit in real time and sending the working parameters to the target service processing basic unit through the Ethernet.
Specifically, the management service software is installed on the control terminal, after all service processing basic units in the audio/video system are powered on, the management service software is connected according to the default server IP address, the management service software performs point name and establishes an address mapping table for all online service processing basic units according to input or output types, and in the address mapping table, a multicast address sent by audio/video streams of each service processing basic unit and a local IP address are in a unique mapping relation. In addition, the management service software also has the service function of dynamic allocation of the service processing basic unit ports and real-time update management of the address mapping table.
The system application software interface module receives human-computer interaction operation control of an audio and video service system operation software interface on video picture layout and audio data resources, generates corresponding configuration management requirements according to the human-computer interaction operation control, calls a control logic middleware software interface according to the configuration management requirements, converts the control logic middleware software interface into working parameters related to audio and video processing, finally generates corresponding JSON-format command words, finally searches IP and PORT of a target service processing basic unit needing to be configured according to an address mapping table, and calls an Ethernet communication interface to sequentially send the generated command words to the target service processing basic unit. The data format definition of the JSON command word is shown in fig. 4.
As shown in fig. 5, the working method of the audio/video system based on the service processing basic unit according to the present invention is as follows:
s1, establishing an address mapping table of all online service processing basic units in the audio and video system at the control terminal, and updating and maintaining in real time according to the newly added audio and video stream sending port;
s2, receiving human-computer interaction operation control of the audio/video service system operation software interface on video picture layout and audio data resources, and generating corresponding configuration management requirements according to the human-computer interaction operation control; the configuration management requirements comprise video window layout, audio and video stream grouping, grouping removal management and coding and decoding parameters;
s3, calling a control logic middleware software interface according to the configuration management requirement, converting the control logic middleware software interface into a working parameter related to audio and video processing, and finally generating a corresponding command word in a JSON format; specifically, three JSON command words including a coding configuration command, a decoding configuration command and a video fusion configuration command are respectively generated;
s4, respectively searching IP and PORT of a target service processing basic unit to be configured according to the address mapping table, and calling an Ethernet communication interface to send the generated command word to the target service processing basic unit;
and S5, after receiving the JSON command word related to the business processing basic unit, analyzing and extracting the working parameter related to the audio and video processing, calling a local audio control parameter API interface and a video control parameter API interface to realize the parameter configuration function, and finishing the scheduling management of the system on the audio and video resources.
The audio and video system based on the service processing basic unit and the working method thereof decompose the related services and applications of the audio and video system into the basic functions of fine-grained video coding and decoding, video transmission and video fusion processing by analyzing, summarizing and integrating the related services and applications of the audio and video system, design the configurable, quantifiable and universal service processing basic unit by adopting a mode of combining software and hardware, realize the remote online configuration of a bottom layer software application mode and an audio and video hardware working mode by a control terminal, and improve the flexibility and expandability of the audio and video system and the deep customization capability aiming at the comprehensive application. The invention is suitable for the application fields of video conferences, video command scheduling and security monitoring, supports standard definition, HD and 4K video formats, adopts the service processing basic unit with standardized design, reduces the coupling between a system frame and a hardware platform, facilitates the seamless upgrade of the later service processing basic unit under the condition of keeping an application interface and a logic control interface unchanged, and improves the overall performance of an audio and video system.
The above apparatus embodiments and method embodiments are in one-to-one correspondence, and reference may be made to the method embodiments for a brief point of the apparatus embodiments.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
Those of skill would further appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both, and that the various illustrative components and steps have been described above generally in terms of their functionality in order to clearly illustrate this interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
The steps of a method or algorithm described in connection with the embodiments disclosed herein may be embodied directly in hardware, in a software module executed by a processor, or in a combination of the two. A software module may reside in random access memory, read only memory, electrically programmable ROM, electrically erasable programmable ROM, registers, hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art.
While the present invention has been described with reference to the embodiments shown in the drawings, the present invention is not limited to the embodiments, which are illustrative and not restrictive, and it will be apparent to those skilled in the art that various changes and modifications can be made therein without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (7)
1. An audio and video system based on a service processing basic unit is characterized by comprising a control terminal, audio and video input and output equipment, a system Ethernet switch and a plurality of service processing basic modules, wherein the service processing basic unit is connected with the audio and video input and output equipment through an input and output interface, and the plurality of service processing basic units are all interconnected with the control terminal through Ethernet; wherein the content of the first and second substances,
the audio and video input and output device is used for executing input and output of audio and video signals;
the system Ethernet switch realizes network interconnection among all devices in the audio and video system;
the business processing basic unit is used for carrying out coding and decoding processing and video fusion processing on the video signals and the audio signals, and transmitting and receiving the coded audio signals and the coded video signals by adopting a distributed Ethernet switching architecture and a data communication interface with a uniform format;
the control terminal is used for remotely configuring and managing working parameters of a corresponding service processing basic unit through an Ethernet interface and scheduling and managing all audio and video resources in the audio and video system;
the service processing basic unit comprises an audio and video coding function unit, an audio and video decoding fusion function unit and an internal exchange function unit; wherein the content of the first and second substances,
the audio and video coding functional unit is used for collecting video signals and audio signals, coding the audio and video signals and sending coded audio streams and video streams to the Ethernet;
the audio and video decoding and fusing functional unit is used for receiving the far-end audio stream and the video stream from the Ethernet, decoding the far-end audio stream and the video stream into an audio signal and a video signal, and simultaneously realizing the fusion processing functions of video splicing, multilayer superposition, zooming and transparency setting;
the internal exchange function unit is used for providing an Ethernet interconnection interface between the audio and video coding function unit and the audio and video decoding fusion function unit and providing an external Ethernet interconnection interface for the service processing basic unit;
the audio and video coding function unit, the audio and video decoding fusion function unit and the internal switching function unit are all connected by adopting a distributed Ethernet switching architecture and a data communication interface with a uniform format, wherein the audio and video coding function unit and the audio and video decoding fusion function unit are all connected with audio and video input and output equipment through an input and output interface;
the business processing basic units are stacked and cascaded through the Ethernet switch, and are grouped to form a business processing basic unit cluster, so that when the performance of the audio and video input and output equipment exceeds the processing capacity of a single business processing basic unit in an application occasion, the internal connection relation and the external connection of the business processing basic unit cluster are both Ethernet distributed architecture.
2. The audio-video system based on the service processing basic unit as claimed in claim 1, wherein the audio-video coding functional unit and the audio-video decoding and fusing functional unit are respectively provided with an audio stream data software interface, a video stream data software interface and a command control software interface.
3. The audio/video system based on the service processing basic unit as claimed in claim 1, wherein the control terminal comprises a management service module and a system application software interface module;
the management service module is used for monitoring all online business processing basic units in the current audio and video system in real time and managing ports;
the system application software interface module is used for calling a control logic middleware software interface, converting the audio/video input/output interface layout effect and the man-machine interaction operation into the working parameters of the relevant service processing basic unit in real time and sending the working parameters to the target service processing basic unit through the Ethernet.
4. The audio/video system based on the service processing basic unit according to claim 3, wherein the management service module is specifically configured to perform point name and address mapping table establishment for all online service processing basic units according to input or output types, and perform real-time update management for dynamic allocation of ports of the service processing basic units and the address mapping table.
5. The audio-video system based on the service processing basic unit as claimed in claim 4, wherein in the address mapping table, the multicast address sent by each audio-video stream and the local IP address are in a unique mapping relationship.
6. The audio/video system based on the service processing basic unit according to claim 3, wherein the system application software interface module generates JSON command words from the converted working parameters and sends the JSON command words to the target service processing basic unit through the ethernet.
7. The method for operating the audio/video system based on the service processing basic unit as claimed in claim 1, wherein the method for operating the audio/video system based on the service processing basic unit comprises the following steps:
establishing an address mapping table of all online service processing basic units in the audio and video system at the control terminal, and updating and maintaining in real time according to the newly added audio and video stream sending port;
receiving human-computer interaction operation control of an audio and video service system operation software interface on video picture layout and audio data resources, and generating corresponding configuration management requirements according to the human-computer interaction operation control;
calling a control logic middleware software interface according to the configuration management requirement, converting the control logic middleware software interface into a working parameter related to audio and video processing, and finally generating a corresponding command word in a JSON format;
respectively searching IP and PORT of a target service processing basic unit to be configured according to the address mapping table, and calling an Ethernet communication interface to send the generated command word to the target service processing basic unit;
and after receiving the JSON command words related to the business processing basic unit, the business processing basic unit analyzes and extracts the working parameters related to audio and video processing, and calls a local audio control parameter API interface and a video control parameter API interface to realize the parameter configuration function so as to complete the scheduling management of the system on the audio and video resources.
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