/**********************************************************************
 * ISO MPEG Audio Subgroup Software Simulation Group (1996)
 * ISO 13818-3 MPEG-2 Audio Encoder - Lower Sampling Frequency Extension
 *
 * $Id: common.c,v 1.2 1997/01/19 22:28:29 rowlands Exp $
 *
 * $Log: common.c,v $
 * Revision 1.2  1997/01/19 22:28:29  rowlands
 * Layer 3 bug fixes from Seymour Shlien
 *
 * Revision 1.1  1996/02/14 04:04:23  rowlands
 * Initial revision
 *
 * Received from Mike Coleman
 **********************************************************************/
/**********************************************************************
 *   date   programmers         comment                               *
 * 2/25/91  Doulas Wong,        start of version 1.0 records          *
 *          Davis Pan                                                 *
 * 5/10/91  W. Joseph Carter    Created this file for all common      *
 *                              functions and global variables.       *
 *                              Ported to Macintosh and Unix.         *
 *                              Added Jean-Georges Fritsch's          *
 *                              "bitstream.c" package.                *
 *                              Added routines to handle AIFF PCM     *
 *                              sound files.                          *
 *                              Added "mem_alloc()" and "mem_free()"  *
 *                              routines for memory allocation        *
 *                              portability.                          *
 *                              Added routines to convert between     *
 *                              Apple SANE extended floating point    *
 *                              format and IEEE double precision      *
 *                              floating point format.  For AIFF.     *
 * 02jul91 dpwe (Aware Inc)     Moved allocation table input here;    *
 *                              Tables read from subdir TABLES_PATH.  *
 *                              Added some debug printout fns (Write*)*
 * 7/10/91 Earle Jennings       replacement of the one float by FLOAT *
 *                              port to MsDos from MacIntosh version  *
 * 8/ 5/91 Jean-Georges Fritsch fixed bug in open_bit_stream_r()      *
 *10/ 1/91 S.I. Sudharsanan,    Ported to IBM AIX platform.           *
 *         Don H. Lee,                                                *
 *         Peter W. Farrett                                           *
 *10/3/91  Don H. Lee           implemented CRC-16 error protection   *
 *                              newly introduced functions are        *
 *                              I_CRC_calc, II_CRC_calc and           *
 *                              update_CRC. Additions and revisions   *
 *                              are marked with dhl for clarity       *
 *10/18/91 Jean-Georges Fritsch fixed bug in update_CRC(),            *
 *                              II_CRC_calc() and I_CRC_calc()        *
 * 2/11/92  W. Joseph Carter    Ported new code to Macintosh.  Most   *
 *                              important fixes involved changing     *
 *                              16-bit ints to long or unsigned in    *
 *                              bit alloc routines for quant of 65535 *
 *                              and passing proper function args.     *
 *                              Removed "Other Joint Stereo" option   *
 *                              and made bitrate be total channel     *
 *                              bitrate, irrespective of the mode.    *
 *                              Fixed many small bugs & reorganized.  *
 * 3/20/92 Jean-Georges Fritsch  fixed bug in start-of-frame search   *
 * 6/15/92 Juan Pineda          added refill_buffer(bs) "n"           *
 *                              initialization                        *
 * 7/08/92 Susanne Ritscher     MS-DOS, MSC6.0 port fixes             *
 * 7/27/92 Mike Li               (re-)Port to MS-DOS                  *
 * 8/19/92 Soren H. Nielsen     Fixed bug in I_CRC_calc and in        *
 *                              II_CRC_calc.  Added function: new_ext *
 *                              for better MS-DOS compatability       *
 * 3/10/93 Kevin Peterson       changed aiff_read_headers to handle   *
 *                              chunks in any order.  now returns     *
 *                              position of sound data in file.       *
 * 3/31/93 Jens Spille          changed IFF_* string compares to use  *
 *                              strcmp()                              *
 * 5/30/93 Masahiro Iwadare     removed the previous modification     *
 *                              for UNIX.                             *
 * 8/27/93 Seymour Shlien,      Fixes in Unix and MSDOS ports,        *
 *         Daniel Lauzon, and                                         *
 *         Bill Truerniet                                             *
 *--------------------------------------------------------------------*
 *  8/24/93 Masahiro Iwadare    Included IS modification in Layer III.*
 *                              Changed for 1 pass decoding.          *
 *  9/07/93 Toshiyuki Ishino    Integrated Layer III with Ver 3.9.    *
 *--------------------------------------------------------------------*
 * 11/20/93 Masahiro Iwadare    Integrated Layer III with Ver 4.0.    *
 *--------------------------------------------------------------------*
 *  7/14/94 Juergen Koller      rewind of bitbuffer added             *
 *  6/12/95 Soeren H. Nielsen   Bug fix in new_ext().                 *
 *  7/11/95 Soeren H. Nielsen   Changes for MPEG-2 LSF Layer I and II *
 *--------------------------------------------------------------------*
 * 8/02/95  mc@fivebats.com     Added code to determine byte-order,   *
 *                              fixes to AIFF routines. Modified Mac  *
 *                              code to work with new Apple headers   *
 **********************************************************************/