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DESCRIPTION

   Demuxer for Kodak Photo CD (PCD) ImagePac files.

   The demuxer validates the PCD header ("PCD_IPI" at offset 0x800),
   exposes picture attributes (width/height/turn) and changes the stream
   format from MMF_STREAM to MMF_VIDEO_PHOTOCD so that photocd.decoder can
   be selected.

   It does not modify the bytestream; it forwards pulls from the input.

   Ports:
     - port 0: input  (MMF_STREAM)
     - port 1: output (MMF_VIDEO_PHOTOCD)

   Extra:
     - MMA_ExtraData points to a PCD_DATA structure (turn/base_offset/etc).