src/ac3_decoder/ac3_exponent.c

   1 /*****************************************************************************
   2  * ac3_exponent.c: ac3 exponent calculations
   3  *****************************************************************************
   4  * Copyright (C) 1999, 2000 VideoLAN
   5  * $Id: ac3_exponent.c,v 1.25 2001/05/15 16:19:42 sam Exp $
   6  *
   7  * Authors: Michel Kaempf <maxx@via.ecp.fr>
   8  *          Michel Lespinasse <walken@zoy.org>
   9  *          Aaron Holtzman <aholtzma@engr.uvic.ca>
  10  *
  11  * This program is free software; you can redistribute it and/or modify
  12  * it under the terms of the GNU General Public License as published by
  13  * the Free Software Foundation; either version 2 of the License, or
  14  * (at your option) any later version.
  15  *
  16  * This program is distributed in the hope that it will be useful,
  17  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  18  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19  * GNU General Public License for more details.
  20  *
  21  * You should have received a copy of the GNU General Public License
  22  * along with this program; if not, write to the Free Software
  23  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111, USA.
  24  *****************************************************************************/
  25
  26 /*****************************************************************************
  27  * Preamble
  28  *****************************************************************************/
  29 #include "defs.h"
  30
  31 #include <string.h>                                    /* memcpy(), memset() */
  32
  33 #include "config.h"
  34 #include "common.h"
  35 #include "threads.h"
  36 #include "mtime.h"
  37
  38 #include "intf_msg.h"                        /* intf_DbgMsg(), intf_ErrMsg() */
  39
  40 #include "stream_control.h"
  41 #include "input_ext-dec.h"
  42
  43 #include "audio_output.h"
  44
  45 #include "ac3_imdct.h"
  46 #include "ac3_downmix.h"
  47 #include "ac3_decoder.h"
  48
  49 #include "ac3_internal.h"
  50
  51 #include "ac3_exponent.h"
  52
  53 int exponent_unpack (ac3dec_t * p_ac3dec)
  54 {
  55     u16 i;
  56
  57     for (i = 0; i < p_ac3dec->bsi.nfchans; i++)
  58     {
  59         if (exp_unpack_ch (p_ac3dec, UNPACK_FBW, p_ac3dec->audblk.chexpstr[i],
  60                            p_ac3dec->audblk.nchgrps[i],
  61                            p_ac3dec->audblk.exps[i][0],
  62                            &p_ac3dec->audblk.exps[i][1],
  63                            p_ac3dec->audblk.fbw_exp[i]))
  64         {
  65             return 1;
  66         }
  67     }
  68
  69     if (p_ac3dec->audblk.cplinu)
  70     {
  71         if (exp_unpack_ch (p_ac3dec, UNPACK_CPL, p_ac3dec->audblk.cplexpstr,
  72                            p_ac3dec->audblk.ncplgrps,
  73                            p_ac3dec->audblk.cplabsexp << 1,
  74                            p_ac3dec->audblk.cplexps,
  75                            &p_ac3dec->audblk.cpl_exp[p_ac3dec->audblk.cplstrtmant]))
  76         {
  77             return 1;
  78         }
  79     }
  80
  81     if (p_ac3dec->bsi.lfeon)
  82     {
  83         if (exp_unpack_ch (p_ac3dec, UNPACK_LFE, p_ac3dec->audblk.lfeexpstr,
  84                            2, p_ac3dec->audblk.lfeexps[0],
  85                            &p_ac3dec->audblk.lfeexps[1],
  86                            p_ac3dec->audblk.lfe_exp))
  87         {
  88             return 1;
  89         }
  90     }
  91
  92     return 0;
  93 }
  94