A few last things:

1. Section 6.2, in WMP_Open, the argument "content_identifier[256];" - see ';' PROPOSAL: the ';' shall become ','
2. Section 6.2.2 wmp_seqnum_type_t, and Section 6.2.5 wmp_delay_type_t, share some enumarator strings with different associated value - see "TIME". PROPOSAL, change the enumeration strings to:

typedef enum {
  NO_DELAY = 0, // No delay is added (delay value shall be set to 0)
  DELAY_TIME     = 1, // Time delay expressed in milliseconds
  DELAY_FRAME    = 2  // Frame delay expressed in number of frames
} wmp_delay_type_t;