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Abstract

A decoding apparatus decodes video data coded at a main level or a low level, by using a hardware system adapted for a high level or a high-1440 level according to the MPEG-2 recommendation. The decoding apparatus can decode a greater amount of the video data which has been coded at a level lower than the high level or the high-1440 level, during an interval of time of decoding the data of the high level or the high-1440 level. The decoding apparatus includes a bit buffer memory for storing, by each channel, the video data of a plurality of channels coded at a low level or a main level in a syntactic structure which has been defined by the MPEG-2. The decoding apparatus also includes a parsing unit for performing a parsing operation of a desired channel video data bitstream applied from the bit buffer memory, for storing side information obtained by the parsing results in a side information storage unit store, for reading the side information needed to decode a subsequent decoding operation from the side information storage unit store whenever a channel alteration occurs, and for outputting the read side information together with the coded video data of a new channel, and a decoder for decoding the data supplied from the parsing unit.

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