Coding/decoding apparatus, coding/decoding method, coding/decoding integrated circuit and coding/decoding program

Abstract

The coding / decoding apparatus which performs coding and decoding at the same time includes: (a) a variable length coding unit which performs, on input data, variable length coding which does not include arithmetic coding, so as to generate first-type stream data; (b) an arithmetic coding unit which performs arithmetic coding on the first-type stream data so as to generate second-type stream data; (c) a first recording area in which the second-type stream date is recorded; and (d) a variable length decoding unit which performs, on the first-type stream data, variable length decoding for decoding a data format of the first-type stream data into a data format applied before the variable length coding is performed, so as to generate output data.

Description

technical field [0001] The present invention relates to a coding and decoding device, which simultaneously performs video recording and playback when arithmetic coding and the like are used. Background technique [0002] In recent years, we have ushered in the multimedia era of comprehensive processing of sound, image and other pixel values. The original information media, that is, newspapers, foreign materials, televisions, radios, and telephones that convey information to people, have become objects of multimedia. And arouse attention. In general, so-called multimedia not only displays text, but also correlates graphics, sounds, and especially images to display simultaneously. However, to make the above-mentioned original information media the object of multimedia, the information must be displayed in digital form. [0003] However, if the amount of information contained in the above-mentioned information media is calculated as the amount of digital information, in the ca...

AI Technical Summary

Problems solved by technology

[0027] However, when an arithmetic coding system such as CABAC is used in a recording / playback device (such as a DVD / HDD recorder, etc.) based on standards such as H.264, since sequential processing is included in variable-length coding processing and variable-length decoding processing, There may be such a problem: the playback time cannot catch up with the recording time

[0030] That is, when a machine based on the H.264 standard uses an arithmetic coding method such as CABAC to perform variable-length coding processing, the coding and decoding of dynamic images are performed at the same time, or in the case of time-sharing processing that is apparently simultaneous processing, the occurrence of Such a problem: when performing catch-up playback (or time-shifted playback), the playback moment cannot catch up with the recording moment

[0031] Faced with such a problem, as shown in Patent Document 1, this problem can be alleviated to a certain extent by adopting error handling by increasing the circuit scale, but at the cost of this, the problem of increasing the circuit scale is caused.

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