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Apple Video
Apple Video is a lossy video compression and decompression algorithm (codec) developed by Apple Inc. and first released as part of QuickTime 1.0 in 1991. The codec is also known as QuickTime Video, by its FourCC RPZA and the name Road Pizza. When used in the AVI container, the FourCC AZPR is also used.〔 The bit-stream format of Apple Video has been reverse-engineered and a decoder has been implemented in the projects XAnim and libavcodec.〔
== Technical Details ==
The codec operates on 4×4 blocks of pixels in the RGB colorspace. Each frame is segmented into 4×4 blocks in raster-scan order. Each block is coded in one of four coding modes: skip, single color, four color, or 16 color.〔 Colors are represented by 16 bits with a bit-depth of 5 bit for each of the three components red, green, and blue, a format known as RGB555.〔 Because Apple Video operates in the image domain without motion compensation, decoding is much faster than MPEG-style codecs which use motion compensation and perform coding in a transform domain. As a tradeoff, the compression performance of Apple Video is lower.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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