Đang chuẩn bị liên kết để tải về tài liệu:
Bài giảng Hệ điều hành nâng cao - Chapter 20: Multimedia Systems

Bài giảng Hệ điều hành nâng cao - Chapter 20: Multimedia Systems trình bày về khái niệm đa phương tiện, nén, yêu cầu của đa phương tiện hạt nhân, lập kế hoạch CPU, lập kế hoạch đĩa, quản lý mạng,.Mời bạn đọc cùng tham khảo. | Chapter 20: Multimedia Systems 1 Chapter 20: Multimedia Systems What is Multimedia? Compression Requirements of Multimedia Kernels CPU Scheduling Disk Scheduling Network Management An Example: Cineblitz 2 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 3 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 4 Media Delivery Multimedia data is stored in the file system like other 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 5 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. 6 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. On-demand streaming - used to deliver media streams such as movies, archived lectures, etc. The events are not delivered in real-time. 7 Multimedia Systems Characteristics Multimedia files can be quite large Continuous media data may require very high data rates Multimedia applications may be sensitive to timing delays during playback of the media 8 Compression Because of the size | Chapter 20: Multimedia Systems 1 Chapter 20: Multimedia Systems What is Multimedia? Compression Requirements of Multimedia Kernels CPU Scheduling Disk Scheduling Network Management An Example: Cineblitz 2 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 3 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 4 Media Delivery Multimedia data is stored in the file system like other 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 .