PMM

2006-05-03T03:38:41Z

1146628153:

* Extensions: pmm
* Samples: [http://www.mplayerhq.hu/MPlayer/samples/game-formats/krazy-ivan-pmm/ http://www.mplayerhq.hu/MPlayer/samples/game-formats/krazy-ivan-pmm/]

The game [http://www.mobygames.com/game/windows/krazy-ivan Krazy Ivan] uses multimedia files with the extension .pmm. All multi-byte numbers are little endian. The general [[FourCC]] chunk format is as follows:

bytes 0-3 chunk type
bytes 4-7 chunk size, not including 8-byte preamble
bytes 8.. chunk payload

A PMM file begins with the following header:

bytes 0-3 file signature: 'PIFF'
bytes 4-7 total file size, not including first 8 bytes
bytes 8-11 fourcc: 'PXMT'
bytes 12-15 fourcc: 'PXMH'
bytes 16-19 size of header
bytes 20-39 unknown
bytes 40-71 apparently a freeform, NULL-terminated string that
desribes certain video properties, e.g.,
"Windows 15Hz X2"; this example gives away the framerate
and, given that the video resolution does not appear to
be encoded anywhere else, may present some special coding
for the width and height with 'X2'
bytes 72-73 audio sample rate
byte 74 audio channels (?)
byte 75 audio bytes/sample (?)
bytes 76-83 unknown

Following the header is a CPAL chunk (provided that the file has 8-bit video). This contains a number (not necessarily 256) of RGB palette components with a full 8-bit range.

Afterwards, there are a number of audio and video chunks. The first chunk appears to be a MPAL chunk which is quite large. Following that are a series of AUDO chunks which contain [[PCM]] audio, and BODY chunks which presumably carry encoded video. Details of the video coding method are unknown.

[[Category:Game Formats]]

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