Re: [Tsshp-hackers] high res cutscenes format 2

[jim <ji...@ma...>]

I've been investigating these on a slightly different tack ... it seems
that the chunk type is determined by the low 3 bits of the type byte. This
gives 6 (out of a possible 8) chunk types: 0 = end marker, 1 = video
frame, 2 = audio, 3 = text control, 4 = palette, 5 = dictionary. The rest
of the byte is additional information.

In the case of a video frame, bits 3-6 determine the image type. 0xf here
is the new high-res compression format, corresponding to a chunk type of
0x79. Otherwise it's just the ordinary image type: type 4 gives chunk type
0x21 which is indeed the usual System Shock RLE based coding.

There are 2 types of dictionary chunk (I'm assuming, for the moment,
that's what they are), 0x05 and 0x0d, as you know.

That's all for the moment ...

jim
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                                              - Bill Stickers is innocent!