CODECINFO

Determines whether data is to be compressed or decompressed. 

typedef struct _CODECINFO {
  ULONG      ulLength;      /*  Size of the CODECINFO data structure, in bytes. */
  FOURCC     fccCodecType;  /*  Describes compression type; 'RAW' if uncompressed. */
  ULONG      ulCodecCaps;   /*  Flag indicating CODEC capabilities. */
} CODECINFO;

typedef CODECINFO *PCODECINFO;