DEFINITION MODULE PlayList;

	(********************************************************)
	(*							*)
	(*	Playing sounds from a list of buffers		*)
	(*							*)
	(*  Programmer:		P. Moylan, T. Channon		*)
	(*  Last edited:	26 February 1995		*)
	(*  Status:		Working				*)
	(*							*)
	(*	Requires a fast processor, because the timing	*)
	(*	constraints are fairly tight.			*)
	(*							*)
	(********************************************************)

FROM SYSTEM IMPORT BYTE;

FROM PlayBuff IMPORT
    (* const*)	OutputBufferSize;

TYPE
    BufferList;		(* is private *)
    OutputBufferSubscript = [0..OutputBufferSize-1];
    OutputBufferPointer = POINTER TO ARRAY OutputBufferSubscript OF BYTE;

PROCEDURE CreateList (VAR (*OUT*) L: BufferList);

    (* Creates an empty list. *)

PROCEDURE AddToList (VAR (*INOUT*) L: BufferList;  p: OutputBufferPointer);

    (* Appends p^ to L. *)

PROCEDURE PlayFromList (L: BufferList);

    (* Real sound play. *)

PROCEDURE DiscardList (VAR (*INOUT*) L: BufferList);

    (* Returns the whole of L to free storage. *)

END PlayList.