Dispositif de décodage d'images MPEG et méthode pour rechercher un code spécifique dans le train de bits

MPEG Bilddekodierer und Verfahren zur Suche von einem spezifischen Kode in dem Bitstrom

MPEG image decoding apparatus and method for searching a specific code in the bitstream

Abstract

An MPEG image decoding apparatus and method is disclosed, by which normal images can be supplied even if a bit stream is a nonstandardized bit stream having an error. The apparatus comprises a buffer (1) for temporarily storing data of an input bit stream and outputting the stored data in input order; a register (2) for storing the data output from the buffer in its empty area; a first data-search section (3) for searching the data stored in the register so as to detect a specific code by executing a byte-unit collating operation; a second data-search section (4) for searching the data so as to detect a specific code by executing a bit-unit collating operation; a control section (5) for choosing one of outputs from the first and second data-search sections; a shifter (6) for extracting a retrieved data from among the data stored in the register based on the chosen output, and shifting the remaining non-retrieved data towards the head of the register and making an empty area in the register; and a decoder (7) for decoding the retrieved data.

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