/*                                                             v1.0 24.MAY.2005
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                    ITU-T - USER'S GROUP ON SOFTWARE TOOLS
                   ========================================

       =============================================================
       COPYRIGHT NOTE: This source code, and all of its derivations,
       is subject to the "ITU-T General Public License". Please have
       it  read  in    the  distribution  disk,   or  in  the  ITU-T
       Recommendation G.191 on "SOFTWARE TOOLS FOR SPEECH AND  AUDIO
       CODING STANDARDS".
	         ** This code has  (C) Copyright by AT&T Corp. **
       =============================================================

MODULE:         G711 Appendix I PLC module
                Sub-unit: Error pattern file routines

ORIGINAL BY:	AT&T Corp.

DESCRIPTION:
        This file contains procedures for reading the error pattern file.

FUNCTIONS:
  readplcmask_open ......... Open the file containing the packet loss concealment pattern.
                             Selelct the input routine based on the type of the file.
                             File type and input routine are from softbits.[ch] in G.191.

  readplcmask_erased ....... Read in a value from the file. Return 1 if erased, 0 if good.
                             if the error pattern file is shorter than the input file, roll over
                             and start from the beginning. This is useful for uniform error patterns.

  readplcmask_close ........ Clear everything out in case we call something after the close.

HISTORY:
    24.May.05 v1.0 First version <AT&T>
				   Integration in STL2005 <Cyril Guillaum