A Service Platform for Subscription-Based Live Video Streaming
I. INTRODUCTION
Live Streaming of audio and video is becoming rapidly popular among the internet users with the growth and expansion of broadband internet. A streaming service has plenty of applications such as surveillance, coverage of entertainment events, video conferencing [1]. Various streaming solutions providing platforms for delivering above services are available. Most commercial streaming solutions offer functionalities and features such as remote camera pan/tilt control, recording of media, integration to charging mechanisms, web based access and securing streamed content [2-4]. However a particular solution doesnrsquo;t contain all the above features as each of them is meant to be used for a particular application. A more generic platform would enable the service provider to attract a larger customer base by covering different types of applications.
Much research has been carried out on the subject of designing service platforms for multimedia streaming services. Pavlovski and Staes-Polet propose an architecture to deliver different types of multimedia services through fixed and mobile broadband network [5]. In the architecture, the common services such as presentation services, security services, registration and subscription services, integration with billing systems and network channels which are required for any application, are implemented at a lower level. Eoun-seuk-u and Yoo have developed a large scale live multimedia streaming framework for implementing ubiquitous city (U-city) [6]. The research covers several issues related to developing middleware that handles large
number of cameras installed at different places of the city which can be used for applications such as traffic control, tourist route information, video surveillance and disaster evacuation. The framework called as lsquo;SLiMrsquo; handles the two major components, camera management network and media distribution network. It uses the concept of employing different servers for performing different tasks in order to provide scalability to handle larger load. China has launched a project called lsquo;CERNET2rsquo; connecting countryrsquo;s education and research institutes through next generation ipv6 networks. Chen and Shen propose a multimedia service framework based on Session Initiation Protocol (SIP) for CERNET2 to provide the users with high quality, real-time and non-real time multimedia [7]. It is a 3 layer model consisting of a transport network layer, session control layer and application service layer.
The most important feature of a generic streaming platform is the flexibility for different types of applications. By offering different types of subscriptions for the service users (customers), a single service platform can adapt its functionality based on the application requirements given by each customer. In this paper, we propose a design of a generic live streaming platform which is capable of delivering subscription based services. A set of channels or live audio/video feeds captured from a number of IP cameras are provided by the platform and the users need to subscribe to each of the channel they want to view.
II. SUBSCRIPTION FRAMEWORK
To elaborate the need for providing different subscriptions based on application context, a set of example application scenarios for a live media streaming service is considered below:
bull; Police department may use the service for a surveillance process to monitor activities at several high security zones and to arrest suspects. The video feeds captured by the surveillance cameras need to be well protected to prevent possible unauthorized access. To analyze past incidents, live streams have to be recorded.
bull; The traffic police may monitor any possible traffic jams on the highways in order to identify places to assist traffic. The users or operators of the service must be
given full controllability of the traffic monitoring cameras to pan and tilt them as needed.
bull; Factory owners may monitor the daily activities of their factories through the internet from anywhere. They should be given full control over the system at their factory premises including the provision for adding and removing surveillance cameras. Security of the streamed data is a concern because they are available through the public internet and the owners donrsquo;t want their factories to be watched by unauthorized people.
bull; A service may be given for the general public to watch ongoing sports tournaments live. Only the service provider is given the ability to control cameras here. As the content streamed in this application is not confidential, higher security measures for streamed media are not required.
According to the above scenarios, a Service Subscription represents a set of lsquo;service parametersrsquo; that are determined based on the application specific requirements of the respective user. The platform defines two main service parameters.
bull; First the functionalities provided by the service to the users such as camera pan/tilt, adding cameras, media recording must be authorized based on subscription. This is referred to as lsquo;Service functionalityrsquo;.
bull; Secondly the streamed content must be protected based on subscriberrsquo;s security requirement which is called lsquo;grade of content protectionrsquo;.
A set of “requirement parameters” that are provided at the subscription are defined and a “subscription framework” determines the service parameters based on those requirement parameters as illustrated in Figure 1.
GradeOfSecurity = Required security level (2)
III. ARCHITECTURE OF GENERIC STREAMING SERVICE PLATFORM
The total system consists of three main entities: Media Streaming System (MSS), network of IP cameras, and a number of web based clients. The MSS is the core system component which basically receives audio and video feeds from camera
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A Service Platform for Subscription-Based Live Video Streaming
I. INTRODUCTION
Live Streaming of audio and video is becoming rapidly popular among the internet users with the growth and expansion of broadband internet. A streaming service has plenty of applications such as surveillance, coverage of entertainment events, video conferencing [1]. Various streaming solutions providing platforms for delivering above services are available. Most commercial streaming solutions offer functionalities and features such as remote camera pan/tilt control, recording of media, integration to charging mechanisms, web based access and securing streamed content [2-4]. However a particular solution doesnrsquo;t contain all the above features as each of them is meant to be used for a particular application. A more generic platform would enable the service provider to attract a larger customer base by covering different types of applications.
Much research has been carried out on the subject of designing service platforms for multimedia streaming services. Pavlovski and Staes-Polet propose an architecture to deliver different types of multimedia services through fixed and mobile broadband network [5]. In the architecture, the common services such as presentation services, security services, registration and subscription services, integration with billing systems and network channels which are required for any application, are implemented at a lower level. Eoun-seuk-u and Yoo have developed a large scale live multimedia streaming framework for implementing ubiquitous city (U-city) [6]. The research covers several issues related to developing middleware that handles large
number of cameras installed at different places of the city which can be used for applications such as traffic control, tourist route information, video surveillance and disaster evacuation. The framework called as lsquo;SLiMrsquo; handles the two major components, camera management network and media distribution network. It uses the concept of employing different servers for performing different tasks in order to provide scalability to handle larger load. China has launched a project called lsquo;CERNET2rsquo; connecting countryrsquo;s education and research institutes through next generation ipv6 networks. Chen and Shen propose a multimedia service framework based on Session Initiation Protocol (SIP) for CERNET2 to provide the users with high quality, real-time and non-real time multimedia [7]. It is a 3 layer model consisting of a transport network layer, session control layer and application service layer.
The most important feature of a generic streaming platform is the flexibility for different types of applications. By offering different types of subscriptions for the service users (customers), a single service platform can adapt its functionality based on the application requirements given by each customer. In this paper, we propose a design of a generic live streaming platform which is capable of delivering subscription based services. A set of channels or live audio/video feeds captured from a number of IP cameras are provided by the platform and the users need to subscribe to each of the channel they want to view.
II. SUBSCRIPTION FRAMEWORK
To elaborate the need for providing different subscriptions based on application context, a set of example application scenarios for a live media streaming service is considered below:
bull; Police department may use the service for a surveillance process to monitor activities at several high security zones and to arrest suspects. The video feeds captured by the surveillance cameras need to be well protected to prevent possible unauthorized access. To analyze past incidents, live streams have to be recorded.
bull; The traffic police may monitor any possible traffic jams on the highways in order to identify places to assist traffic. The users or operators of the service must be
given full controllability of the traffic monitoring cameras to pan and tilt them as needed.
bull; Factory owners may monitor the daily activities of their factories through the internet from anywhere. They should be given full control over the system at their factory premises including the provision for adding and removing surveillance cameras. Security of the streamed data is a concern because they are available through the public internet and the owners donrsquo;t want their factories to be watched by unauthorized people.
bull; A service may be given for the general public to watch ongoing sports tournaments live. Only the service provider is given the ability to control cameras here. As the content streamed in this application is not confidential, higher security measures for streamed media are not required.
According to the above scenarios, a Service Subscription represents a set of lsquo;service parametersrsquo; that are determined based on the application specific requirements of the respective user. The platform defines two main service parameters.
bull; First the functionalities provided by the service to the users such as camera pan/tilt, adding cameras, media recording must be authorized based on subscription. This is referred to as lsquo;Service functionalityrsquo;.
bull; Secondly the streamed content must be protected based on subscriberrsquo;s security requirement which is called lsquo;grade of content protectionrsquo;.
A set of “requirement parameters” that are provided at the subscription are defined and a “subscription framework” determines the service parameters based on those requirement parameters as illustrated in Figure 1.
GradeOfSecurity = Required security level (2)
III. ARCHITECTURE OF GENERIC STREAMING SERVICE PLATFORM
The total system consists of three main entities: Media Streaming System (MSS), network of IP cameras, and a number of web based clients. The MSS is the core system component which basically receives audio and video feeds from camera
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