/**********************************************************************
 * ISO MPEG Audio Subgroup Software Simulation Group (1996)
 * ISO 13818-3 MPEG-2 Audio Encoder - Lower Sampling Frequency Extension
 *
 * $Id: encode.c,v 1.1 1996/02/14 04:04:23 rowlands Exp $
 *
 * $Log: encode.c,v $
 * Revision 1.1  1996/02/14 04:04:23  rowlands
 * Initial revision
 *
 * Received from Mike Coleman
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/**********************************************************************
 *   date   programmers         comment                               *
 * 3/01/91  Douglas Wong,       start of version 1.1 records          *
 *          Davis Pan                                                 *
 * 3/06/91  Douglas Wong        rename: setup.h to endef.h            *
 *                                      efilter to enfilter           *
 *                                      ewindow to enwindow           *
 *                              integrated "quantizer", "scalefactor",*
 *                              and "transmission" files              *
 *                              update routine "window_subband"       *
 * 3/31/91  Bill Aspromonte     replaced read_filter by               *
 *                              create_an_filter                      *
 * 5/10/91  W. Joseph Carter    Ported to Macintosh and Unix.         *
 *                              Incorporated Jean-Georges Fritsch's   *
 *                              "bitstream.c" package.                *
 *                              Incorporated Bill Aspromonte's        *
 *                              filterbank coefficient matrix         *
 *                              calculation routines and added        *
 *                              roundoff to coincide with specs.      *
 *                              Modified to strictly adhere to        *
 *                              encoded bitstream specs, including    *
 *                              "Berlin changes".                     *
 *                              Modified PCM sound file handling to   *
 *                              process all incoming samples and fill *
 *                              out last encoded frame with zeros     *
 *                              (silence) if needed.                  *
 *                              Located and fixed numerous software   *
 *                              bugs and table data errors.           *
 * 19jun91  dpwe (Aware)        moved "alloc_*" reader to common.c    *
 *                              Globals sblimit, alloc replaced by new*
 *                              struct 'frame_params' passed as arg.  *
 *                              Added JOINT STEREO coding, layers I,II*
 *                              Affects: *_bit_allocation,            *
 *                              subband_quantization, encode_bit_alloc*
 *                              sample_encoding                       *
 * 6/10/91  Earle Jennings      modified II_subband_quantization to   *
 *                              resolve type cast problem for MS_DOS  *
 * 6/11/91  Earle Jennings      modified to avoid overflow on MS_DOS  *
 *                              in routine filter_subband             *
 * 7/10/91  Earle Jennings      port to MsDos from MacIntosh version  *
 * 8/ 8/91  Jens Spille         Change for MS-C6.00                   *
 *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 function encode_CRC  *
 *11/ 8/91  Kathy Wang          Documentation of code                 *
 *                              All variablenames are referred to     *
 *                              with surrounding pound (#) signs      *
 * 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.  *
 * 6/16/92  Shaun Astarabadi    Changed I_scale_factor_calc() and     *
 *                              II_scale_factor_calc() to use scale   *
 *                              factor 0 thru 62 only and not to      *
 *                              encode index 63 into the bit stream.  *
 * 7/27/92  Mike Li             (re-)Port to MS-DOS                   *
 * 9/22/92  jddevine@aware.com  Fixed _scale_factor_calc() defs       *
 * 3/31/93  Giogio Dimino       changed II_a_bit_allocation() from:   *
 *                              if( ad > ...) to if(ad >= ...)        *
 * 8/05/93  TEST                changed I_a_bit_allocation() from:    *
 *                              if( ad > ...) to if(ad >= ...)        *
 * 8/02/95  mc@fivebats.com     Changed audio file reading code to    *
 *                              read samples big-endian               *
 *10/15/95  mc@fivebats.com     Modified get_audio() for layer3-LSF   *
 **********************************************************************/