V.F. data decoding method in use for high speed replay and its device

一种在对以MPEG标准编码的数字视频数据解码和高速重放时用于既进行高速重放又能实现自然画面的视频数据解码方法及装置。该方法包括限定MPEG视频数据层次结构中图象层内用户数据内的图象尺寸信息、通过该信息在高速重放时对跳过图象以限定的尺寸跳过、对其他图象解码并重放。该装置包括控制用微处理器、存贮输入视频数据的缓冲存贮器、可变长度解码器、逆量化器、逆离散余弦变换器、运动补偿单元、帧存贮器及切换单元。 A video data decoding method and apparatus for high-speed reproduction of variable length encoded video information is provided to realize a more acceptable high-speed reproduced picture within a faster time. Each picture unit of data in the Group Of Pictures (GOP) layer has a picture header which contains user data which specifies the exact encoded length of that picture unit of data. If during high-speed reproduction that particular unit of picture data is to not to be displayed, then the whole unit of data may be skipped according to the user data which specifies how long the data unit is. Otherwise, there would be no way of knowing a priori how long the picture unit of data has been encoded to be and the entire unit must be read to search for the beginning of the next picture unit of data. As a result of the placement of information regarding the picture unit of data in the picture header, P-picture data as well as I-picture data may feasibly be used for high-speed reproduction.