CN102722377A - Network video application processing system based on adaptive communication environment (ACE) framework - Google Patents
Network video application processing system based on adaptive communication environment (ACE) framework Download PDFInfo
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Abstract
The invention relates to a network video application processing system based on an adaptive communication environment (ACE) framework, and belongs to the technical field of video transmission. The network video application processing system comprises a network transmission protocol module, a transmission protocol resolving module, an input/output event multi-path separation and dispatch module, a message uniform management and distribution module and an application service module, wherein the modules use a service configuration mode, support dynamic loading and can be subjected to different configuration according to application demands; input/output events are efficiently separated and dispatched through the ACE framework; and furthermore, during message communication, an active object mode is used for reducing coupling among the modules. The network video application processing system based on the ACE framework can be applied to different platforms and is simple in development process and relatively high in efficiency; and the system is simple in structure, low in cost and wide in application range.
Description
Technical Field
The invention relates to the technical field of video transmission, in particular to the technical field of network video application processing, and specifically relates to an ACE (adaptive communication environment) framework-based network video application processing system.
Background
With the rapid development of network technology and the continuous new breakthrough of video coding compression technology, it is possible to transmit high-quality video signals in real time in a low-cost IP network. To adapt to high-quality video transmission of multimedia technology, various video network transmission protocols are developed, such as RTSP, RTP, MP2TS, HTTP, and the like. In the process of developing a video application, in addition to paying attention to functions which need to be developed, the related video transmission protocol needs to be known to acquire a corresponding video stream. Meanwhile, due to the characteristic that the video stream occupies network and system resources, the performance and efficiency of the multi-video stream transmission process must be considered. In order to ensure the development efficiency, a developer puts time and energy into the development function of the developer, and a unified video application platform concept is constructed. However, the network video application processing system in the prior art cannot realize cross-platform application, and developers need to correspondingly develop different platforms, which is time-consuming, labor-consuming and low in efficiency.
An ACE framework (Adaptive Communication Environment framework) is an Object Oriented (OO) framework of freely available, open source code in which many core schemas for concurrent Communication software are implemented. ACE provides a rich set of reusable C + + Wrapper facede and framework components that can perform common communication software tasks across a variety of platforms, including: event demultiplexing and event handler dispatching, signal processing, service initialization, interprocess communication, shared memory management, message routing, distributed service dynamic (re) configuration, concurrent execution and synchronization, and so on. Target users of ACE are developers of high performance and real-time communication services and applications. It simplifies the development of OO network applications and services using interprocess communication, event demultiplexing, explicit dynamic linking, and concurrency. Furthermore, ACE automates the configuration and reconfiguration of the system through dynamic linking of services with applications at runtime.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide the network video application processing system based on the ACE framework, which can be applied in a cross-platform mode, has the advantages of simple development process, higher efficiency, simple structure, low cost and wide application range.
In order to achieve the above object, the ACE framework based network video application processing system of the present invention has the following constitutions:
the system comprises: the system comprises a network transmission protocol module, a transmission protocol analysis module, an input/output event demultiplexing and dispatching module, a message unified management and distribution module and an application service module. Wherein:
the system calls the network transmission protocol module through a uniform network transmission protocol interface to acquire network video data;
the transmission protocol analysis module is used for providing various protocol analyzers, generating an analysis tree according to the registered protocol analyzers, mounting different network video access modes on corresponding analysis tree nodes and realizing self-adaptive analysis of network video data;
the input and output event demultiplexing and dispatching module is based on the ACE framework, separates and dispatches the video stream input and output events by utilizing multithreading, and automatically registers the input and output events into the module for input and output event processing by calling the network transmission protocol module;
the message unified management and distribution module is used for realizing message interaction based on an ACE framework active object mode and managing and distributing messages through a unified application service interface;
the application service module is used for providing various application services and interacting with the message unified management and distribution module through the application service interface, and the application service module acquires network video stream by calling the network transmission protocol module.
In the network video application processing system based on the ACE framework, under the state that the network video application processing system runs a Linux operating system, the input and output event demultiplexing and dispatching module is an input and output event demultiplexing and dispatching module based on a Reactor framework; and under the condition that the network video application processing system runs a Windows operating system, the input and output event demultiplexing and dispatching module is an input and output event demultiplexing and dispatching module based on a Proactor framework.
In the network video application processing system based on the ACE framework, the transmission protocol analysis module comprises an Ethernet analyzer unit, a PPPoE analyzer unit, an IP analyzer unit, a UDP analyzer unit, an RTP analyzer unit, an RTSP analyzer unit and an MP2TS analyzer unit, wherein each analyzer unit calls the network transmission protocol module through a network transmission protocol interface to acquire network video data and is connected with the input and output event multi-path separation and dispatch module.
In the network video application processing system based on the ACE framework, the network transmission protocol module comprises an IGMP network transmission protocol unit, an RTSP network transmission protocol unit, an HTTP network transmission protocol unit and an MMS network transmission protocol unit, and the system calls the network transmission protocol units through a uniform network transmission protocol interface.
In the network video application processing system based on the ACE framework, the message unified management and distribution module is used for realizing a message management and distribution mechanism of synchronous messages or asynchronous messages among various application services of the application service module and between the application service module and the input and output event demultiplexing and distribution module.
In the network video application processing system based on the ACE framework, various application services provided by the application service module are self-developed application services for users or other application services used in the system are configured.
In the network video application processing system based on the ACE framework, the network video application processing system also comprises a platform abstraction layer, and the platform abstraction layer is connected with the network transmission protocol module, the transmission protocol analysis module, the input and output event demultiplexing and dispatching module, the message unified management and distribution module and the application service module.
In the network video application processing system based on the ACE framework, the network video application processing system further comprises a bootstrap program module, an upgrade program module and a northbound interface module, wherein the bootstrap program module, the upgrade program module and the northbound interface module are all in information interaction with the platform abstraction layer.
The network video application processing system based on the ACE framework, which adopts the invention, comprises: the system comprises a network transmission protocol module, a transmission protocol analysis module, an input/output event demultiplexing and dispatching module, a message unified management and distribution module and an application service module. Each module uses a service configuration mode, supports dynamic loading and can be configured differently according to application requirements. Input output events are efficiently separated and dispatched using the ACE framework, while messaging uses active object mode to reduce coupling between modules. Therefore, the network video application processing system based on the ACE framework, which can be applied in a cross-platform mode, is simple in development process and higher in efficiency, is simple in structure, low in cost and wide in application range, and is applied to the network video application processing system based on the ACE framework.
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Fig. 1 is a system architecture diagram of an ACE framework based network video application processing system of the present invention.
Detailed Description
In order to clearly understand the technical page of the present invention, the following embodiments are specifically illustrated in detail.
Fig. 1 is a diagram showing the system architecture of the network video application processing system based on the ACE framework according to the present invention.
In one embodiment, the ACE framework based web video application processing system includes: the system comprises a network transmission protocol module, a transmission protocol analysis module, an input/output event demultiplexing and dispatching module, a message unified management and distribution module and an application service module. Wherein: the system calls the network transmission protocol module through a uniform network transmission protocol interface to acquire network video data; the transmission protocol analysis module is used for providing various protocol analyzers, generating an analysis tree according to the registered protocol analyzers, mounting different network video access modes on corresponding analysis tree nodes and realizing self-adaptive analysis of network video data; the input and output event demultiplexing and dispatching module is based on the ACE framework, separates and dispatches video stream input and output events by utilizing multithreading, and automatically registers the input and output events into the module for input and output event processing by calling the network transmission protocol module; the message unified management and distribution module is used for realizing message interaction based on an ACE framework active object mode and managing and distributing messages through a unified application service interface; the application service module is used for providing various application services and interacting with the message unified management and distribution module through the application service interface, and the application service module acquires network video streams by calling the network transmission protocol module, wherein the various application services can be self-developed application services for users or configure other application services used in the system.
In a preferred embodiment, in a state where the network video application processing system runs a Linux operating system, the input/output event demultiplexing and dispatching module is a Reactor framework-based input/output event demultiplexing and dispatching module; and under the condition that the network video application processing system runs a Windows operating system, the input and output event demultiplexing and dispatching module is an input and output event demultiplexing and dispatching module based on a Proactor framework.
In another preferred embodiment, the transport protocol parsing module includes an ethernet parser unit, a PPPoE (point-to-point protocol ethernet) parser unit, an IP (internet protocol) parser unit, a UDP (user datagram protocol) parser unit, an RTP (real-time transport protocol) parser unit, an RTSP (real-time streaming protocol) parser unit, and an MP2TS (h.264 standard codec) parser unit, and each parser unit calls the network transport protocol module through a network transport protocol interface to obtain network video data, and is connected to the input/output event demultiplexing and dispatching module.
In another preferred embodiment, the network transport protocol module includes an IGMP network transport protocol unit, an RTSP network transport protocol unit, an HTTP network transport protocol unit, and an MMS network transport protocol unit, and the system calls each of the network transport protocol units through a unified network transport protocol interface.
In a further preferred embodiment, the message unified management and distribution module is configured to implement a message management and distribution mechanism for synchronous messages or asynchronous messages between various application services of the application service module and between the application service module and the input/output event demultiplexing and dispatching module.
In a further preferred embodiment, the network video application processing system further includes a platform abstraction layer, and the platform abstraction layer is connected to the network transport protocol module, the transport protocol parsing module, the input/output event demultiplexing and dispatching module, the message unified management and distribution module, and the application service module.
In a more preferred embodiment, the network video application processing system further includes a bootstrap module, an upgrade module, and a northbound interface module, and the bootstrap module, the upgrade module, and the northbound interface module all perform information interaction with the platform abstraction layer.
In practical application, the system of the invention is constructed based on a cross-platform ACE network programming framework, and uses a Service Configurator (Service Configurator), a Reactor and a Reactor framework and an Active object pattern (Active object pattern) in the ACE. Wherein,
a service configurator: the service configuration schema allows the runtime to dynamically configure services and flows, whether they are statically linked into the user program or whose objects are dynamically loaded from a shared library, i.e., services can be configured (one object represents one service) and flows can be configured (based on configuration files rather than compile-time assembly modules).
Reactor and Proactor frameworks: architectural mode for event demultiplexing and dispatching. The multiplexing interface select/poll is realized in ACE, and the high-efficiency multiplexing interface epoll under Linux and the high-efficiency multiplexing interface asynchronous IOCP under Windows are simultaneously realized. Meanwhile, an L/F (leader/follower) mode is used in the I/O multiplexing interface implementation to support multithreading.
Active object mode: the mode is used for reducing the coupling between method execution and method calling, and is a more transparent inter-task communication method. This schema is implemented in the ACE and provides an interface to extend.
The platform assembly is divided into a network transmission protocol assembly, a transmission protocol analysis assembly, an I/O event demultiplexing and dispatching assembly, a message unified management and distribution assembly and an application service assembly according to functions, all the assemblies use a service configuration mode, dynamic loading is supported, and different configurations can be carried out according to application requirements 3. I/O events are efficiently split and dispatched using the Reactor or Proactor framework, while messaging uses active object mode to reduce coupling between modules.
The system of the present invention implements the following modular functions:
1. a network transmission protocol module: various network video access modes are provided, and the method is expandable. Such as IGMP, RTSP, HTTP, or the like, is called through a unified Network Transport Protocol Interface (NTPI), thereby acquiring network video data.
2. A transmission protocol analysis module: the parsing tree is generated according to the registered protocol parser, and the network video data is adaptively parsed (such as RTP/RTSP/MP2TS, etc.), so that the network video data is extensible. And mounting different network video access modes on different protocol parsing tree nodes for parsing.
3. I/O event de-multiplexing and dispatching module: multithreading is used for efficiently separating and dispatching video stream I/O events based on a Reactor (under Linux) or a Proactor (under Windows) framework in ACE. And automatically registering the I/O event into the network transmission protocol module by calling the module to process the I/O event.
4. The message unified management and distribution module comprises: and a unified message management and distribution mechanism between the platform and the application service and between the application service and the application service is provided. The module supports synchronous and asynchronous messages, message interaction is realized based on an ACE active object mode, and message management and distribution are carried out through a uniform Application Service Interface (ASI).
5. An application service module: the platform user develops own application service or configures and uses other developed application services according to functional requirements, loads the services into the platform according to a service configuration mode, and performs interaction through an ASI. Meanwhile, the application service can call a network transmission protocol module to acquire the network video stream.
The network video application processing system based on the ACE framework, which adopts the invention, comprises: the system comprises a network transmission protocol module, a transmission protocol analysis module, an input/output event demultiplexing and dispatching module, a message unified management and distribution module and an application service module. Each module uses a service configuration mode, supports dynamic loading and can be configured differently according to application requirements. Input output events are efficiently separated and dispatched using the ACE framework, while messaging uses active object mode to reduce coupling between modules. Therefore, the network video application processing system based on the ACE framework, which can be applied in a cross-platform mode, is simple in development process and higher in efficiency, is simple in structure, low in cost and wide in application range, and is applied to the network video application processing system based on the ACE framework.
In this specification, the invention has been described with reference to specific embodiments thereof. It will, however, be evident that various modifications and changes may be made thereto without departing from the broader spirit and scope of the invention. The specification and drawings are, accordingly, to be regarded in an illustrative rather than a restrictive sense.
Claims (8)
1. A network video application processing system based on ACE framework, the system comprising:
the system calls the network transmission protocol module through a uniform network transmission protocol interface to acquire network video data;
the transmission protocol analysis module is used for providing various protocol analyzers, generating an analysis tree according to the registered protocol analyzers, mounting different network video access modes on corresponding analysis tree nodes and realizing self-adaptive analysis of network video data;
the input and output event demultiplexing and dispatching module is based on the ACE framework, separates and dispatches the video stream input and output events by utilizing multithreading, and automatically registers the input and output events into the module for input and output event processing by calling the network transmission protocol module;
the message unified management and distribution module is used for realizing message interaction based on an ACE framework active object mode and managing and distributing messages through a unified application service interface;
the application service module is used for providing various application services and interacting with the message unified management and distribution module through the application service interface, and the application service module acquires network video stream by calling the network transmission protocol module.
2. The ACE framework based network video application processing system according to claim 1, wherein the i/o event de-multiplexing and dispatching module is a Reactor framework based i/o event de-multiplexing and dispatching module in a state where the network video application processing system runs a Linux operating system; and under the condition that the network video application processing system runs a Windows operating system, the input and output event demultiplexing and dispatching module is an input and output event demultiplexing and dispatching module based on a Proactor framework.
3. The ACE framework based network video application processing system as claimed in claim 1, wherein the transport protocol parsing module comprises an ethernet parser unit, a PPPoE parser unit, an IP parser unit, a UDP parser unit, an RTP parser unit, an RTSP parser unit, and an MP2TS parser unit, each of the parser units calls the network transport protocol module through a network transport protocol interface to obtain network video data, and is connected to the input and output event demultiplexing and dispatching module.
4. The ACE framework based network video application processing system as claimed in claim 1, wherein the network transport protocol module comprises an IGMP network transport protocol unit, an RTSP network transport protocol unit, an HTTP network transport protocol unit and an MMS network transport protocol unit, and the system calls the network transport protocol units through a unified network transport protocol interface.
5. The ACE framework-based network video application processing system according to claim 1, wherein the unified message management and distribution module is configured to implement a message management and distribution mechanism for synchronous or asynchronous messages between various application services of the application service module and between the application service module and the input output event demultiplexing and dispatching module.
6. The ACE framework-based network video application processing system according to claim 1, wherein the various application services provided by the application services module are user self-developed application services or other application services configured for use in the system.
7. The ACE framework based network video application processing system of any one of claims 1 to 6 further comprising a platform abstraction layer connected to the network transport protocol module, transport protocol parsing module, input output event demultiplexing and dispatching module, message unified management and distribution module and application service module.
8. The ACE framework-based network video application processing system according to claim 7, wherein the network video application processing system further comprises a bootstrap module, an upgrade module and a northbound interface module, and the bootstrap module, the upgrade module and the northbound interface module all interact with the platform abstraction layer.
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