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E0262 MIS - Multimedia Playback Systems Prof Pallapa. Venkataram, Electrical Communication Engineering, Indian Institute of Science, Bangalore – 560012,

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Presentation on theme: "E0262 MIS - Multimedia Playback Systems Prof Pallapa. Venkataram, Electrical Communication Engineering, Indian Institute of Science, Bangalore – 560012,"— Presentation transcript:

1 E0262 MIS - Multimedia Playback Systems Prof Pallapa. Venkataram, Electrical Communication Engineering, Indian Institute of Science, Bangalore – , India Multimedia Playback Systems

2 E0262 MIS - Multimedia Playback Systems Playback System Model

3 E0262 MIS - Multimedia Playback Systems Playback System Model A multimedia playback consists of a disk-read which feeds samples into a (D/A) converter at the same rate at which they were sampled and a display which consumes data the rate at which it has recorded. The D/A converter creates a signal that closely approximates the original to the display (or playout) unit. If the samples are not delivered to the D/A converter at precisely the rate at which the sampling occurred, the reproduced sound (or video) will not match the sampled sound (or video).

4 E0262 MIS - Multimedia Playback Systems General Playback Framework The data is not compressed. Digitization of video done by using analog frames of video data at fixed intervals and storing them in binary form. Digitization of audio data is most commonly achieved by sampling an analog signal at fixed intervals and by storing the amplitude of each sample in binary form. Reading the digitized multimedia data (either video or audio or text or images, etc.) is used to refer to retrieving data from the storage device(s), while the term “consume” is used refer to data being consumed by the D/A converter for playout. Delays exist in storage devices and playback units.

5 E0262 MIS - Multimedia Playback Systems Principles of Multimedia data storage and retrieval Data include Audio, Video and animations. Retrieval of these date types from Secondary storage has to satisfy certain time constraints in order to be acceptable to the user. Analyze minimal Buffer requirement Minimum start time for sucessful playback

6 E0262 MIS - Multimedia Playback Systems Read Function

7 E0262 MIS - Multimedia Playback Systems Time is chosen so that no samples are Read. If reading is complete at t r then t <0, R(t) = O. t > t r, R(t) = R(t r ) R(t) is non decreasing function 0

8 E0262 MIS - Multimedia Playback Systems Consumption Function Let t 0 be the start time for playback. Samples Consumed at time t is:

9 E0262 MIS - Multimedia Playback Systems Buffer Function Number of Samples that must be buffered at any time

10 E0262 MIS - Multimedia Playback Systems Playout Calculation

11 E0262 MIS - Multimedia Playback Systems Playout Calculation

12 E0262 MIS - Multimedia Playback Systems Playout Calculation

13 E0262 MIS - Multimedia Playback Systems Minimal Start Time

14 E0262 MIS - Multimedia Playback Systems Continuous Playback Theorems for three cases: (1) The transfer rate of the device is equal to the consumption rate. (2) The transfer rate is less than the consumption rate. (3) The transfer rate is greater than the consumption rate.

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20 Buffer function

21 E0262 MIS - Multimedia Playback Systems Buffer Requirements

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23 Playback with Unavoidable delays

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28 Click to add text

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30 Properties of Multichannel Playback

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