ffmpeg/libavcodec/bethsoftvideo.h

#define VID_PALETTE_NUMCOLORS 256

enum BethsoftVidBlockType
{
    PALETTE_BLOCK = 0x02,
    FIRST_AUDIO_BLOCK = 0x7c,
    AUDIO_BLOCK = 0x7d,
    VIDEO_FULL_FRAME_BLOCK = 0x03,
    VIDEO_DIFFERENCE_FRAME_BLOCK = 0x01,
    VIDEO_YOFFSET_DIFFERENCE_FRAME_BLOCK = 0x04,
    FINISHED_BLOCK = 0x14,
};