By Jan Korst
The luck of multimedia info structures to thoroughly meet the desires of gaining access to and proposing audio/video details from a wide multimedia server relies seriously at the right use of garage and retrieval algorithms appropriate for this activity.
Multimedia garage and Retrieval describes a variety of algorithms from easy to classy: from unmarried consumer to a number of clients, from constant-bit-rate to variable-bit-rate streams, and from unmarried disk to a number of disks. This e-book emphasizes garage and retrieval of video info utilizing magnetic disk structures and its effortless, mathematical process concentrates at the basic algorithms.
- Provides these new to the topic with the elemental rules of the layout and research of video-on-demand platforms and courses the reader in the direction of an intensive knowing of the sphere.
- Comprehensively covers disk scheduling algorithms, together with around robin, double and triple buffering, grouped sweeping, and twin sweep.
- Extensively treats garage suggestions, together with contiguous and segmented garage, tune pairing, striping, and random redundant garage.
- Concludes with additional optimizations within the sector of video transmission, protecting bit-rate smoothing and close to video-on-demand recommendations.
Senior undergraduate and graduate scholars on desktop technological know-how and electric engineering classes will all locate this ebook beautiful. Researchers and people in also will locate it a useful reference.Content:
Chapter 1 creation (pages 1–10):
Chapter 2 Modeling Servers and Streams (pages 11–28):
Chapter three Serving a unmarried CBR circulation (pages 29–44):
Chapter four Serving a number of CBR Streams (pages 45–66):
Chapter five Serving a number of VBR Streams (pages 67–92):
Chapter 6 dossier Allocation thoughts (pages 93–110):
Chapter 7 utilizing a Multi?Zone Disk (pages 111–130):
Chapter eight Striping (pages 131–153):
Chapter nine Random Redundant garage (pages 155–182):
Chapter 10 Bit?Rate Smoothing Algorithms (pages 183–199):
Chapter eleven close to Video?on?Demand techniques (pages 201–229):
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Additional info for Multimedia Storage and Retrieval: An Algorithmic Approach
The bottom-left and top-right edges have a slope of ri , corresponding to the rate at which data is read from the buffer during an idle interval. The top-left and bottom-right edges have a slope of r ri , corresponding to the net buffer increase during reading. 7. Buffer filling as a function of time for non-contiguous storage. Once a disk request is issued, the disk idles between 0 and σ´dmax µ · ρ time units. Serving a Single CBR Stream 40 gray area corresponds to the earliest point at which the read interval may start.
In each cycle, a number of blocks have to be read from disk. 5 for alternative disk scheduling algorithms. The disk accesses that are to be executed in a given cycle are usually ordered so as to minimize disk head movements. Hence, the order in which the streams are served in a cycle may differ from cycle to cycle. We use the term ‘disk scheduling’ to include a set of closely related activities including admission control and scheduling disk accesses. In particular, a disk scheduling algorithm determines ¥ ¥ ¥ ¥ ¥ whether a newly requested stream can be admitted service, taking into account the already admitted streams, the sizes of the buffers of the admitted streams, the sizes of the blocks that are repeatedly transferred for each of the streams, how the disk accesses for the different streams are scheduled in time, and when a newly admitted stream can start consuming data from its buffer.
As the disk transfer rate r is usually much larger than the rate ri required by a single stream i, reading the stream is realized by repeatedly reading a block of data from disk, storing it in the corresponding buffer, and simultaneously reading data from the buffer at the required rate ri . In this way, the buffer masks the fact that the disk cannot generally be accessed at a rate ri r. The question now is how large the buffer should be and, closely related to that, how the disk accesses for reading the successive blocks for stream i should be scheduled in time.