• Hein-Pieter van Braam's avatar
    Interplay MVE: Implement frame format 0x06 · 19f6fd19
    Hein-Pieter van Braam authored
    This implements the 0x06 frame format for Interplay MVE movies. The
    format is relatively simple. The video data consists of two parts:
    
    16 bits per 8x8 block movement data
    a number of 8x8 blocks of pixel data
    
    For each 8x8 block of pixel data the movement data is consulted. There
    are 3 possible meanings of the movement data:
    * zero     : copy the 8x8 block from the pixel data
    * negative : copy the 8x8 block from the previous frame from an offset
                 determined by the actual value of the entry -0xC000.
    * positive : copy the 8x8 block from the current frame from an offset
                 determined by the actual value of the entry -0x4000
    
    Decoding happens in two passes, in the fist pass only new pixeldata is
    copied, during the second pass data is copied from the previous and
    current frames.
    
    The codec expects that the current frame being decoded to still has the
    data from 2 frames ago on it when decoding starts.
    Signed-off-by: 's avatarHein-Pieter van Braam <hp@tmm.cx>
    19f6fd19
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