ch20 - Chapter 20 Multimedia Systems Chapter 20 Multimedia...

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Chapter 20: Multimedia Systems Chapter 20: Multimedia Systems
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20.2 Silberschatz, Galvin and Gagne ©2005 Operating System Concepts Chapter 20: Multimedia Systems Chapter 20: Multimedia Systems What is Multimedia Compression Techniques Requirements of Multimedia Kernels CPU Scheduling Disk Scheduling Network Management An Example: Cineblitz
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20.3 Silberschatz, Galvin and Gagne ©2005 Operating System Concepts Objectives Objectives To identify the characteristics of multimedia data To examine several algorithms used to compress multimedia data To explore the operating system requirements of multimedia data, including CPU and disk scheduling and network management
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20.4 Silberschatz, Galvin and Gagne ©2005 Operating System Concepts What is Multimedia? What is Multimedia? Multimedia data includes - audio and video clips (i.e. MP3 and MPEG files) - live webcasts Multimedia data may be delivered to - desktop PC’s - handheld devices (PDAs, smart phones
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20.5 Silberschatz, Galvin and Gagne ©2005 Operating System Concepts Media Delivery Media Delivery Multimedia data is stored in the file system like othe ordinary data. However, multimedia data must be accessed with specific timing requirements. For example, video must be displayed at 24-30 frames per second. Multimedia video data must be delivered at a rate which guarantees 24-30 frames/second. Continuous-media data is data with specific rate requirements.
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20.6 Silberschatz, Galvin and Gagne ©2005 Operating System Concepts Streaming Streaming Streaming is delivering a multimedia file from a server to a client - typically the deliver occurs over a network connection. There are two different types of streaming: 1. Progressive download - the client begins playback of the multimedia file as it is delivered. The file is ultimately stored on the client computer. 2. Real-time streaming - the multimedia file is delivered to - but not stored on - the client’s computer.
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Silberschatz, Galvin and Gagne ©2005 Operating System Concepts Real-time Streaming Real-time Streaming There are two types of real-time streaming: (1) Live streaming - used to deliver a live event while it is occurring. (2)
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ch20 - Chapter 20 Multimedia Systems Chapter 20 Multimedia...

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