lib/bladeenc/mdct.h

   1 /*
   2                         (c) Copyright 1998-2000 - Tord Jansson
   3                         ======================================
   4
   5                 This file is part of the BladeEnc MP3 Encoder, based on
   6                 ISO's reference code for MPEG Layer 3 compression, and might
   7                 contain smaller or larger sections that are directly taken
   8                 from ISO's reference code.
   9
  10                 All changes to the ISO reference code herein are either
  11                 copyrighted by Tord Jansson (tord.jansson@swipnet.se)
  12                 or sublicensed to Tord Jansson by a third party.
  13
  14         BladeEnc is free software; you can redistribute this file
  15         and/or modify it under the terms of the GNU Lesser General Public
  16         License as published by the Free Software Foundation; either
  17         version 2.1 of the License, or (at your option) any later version.
  18
  19
  20
  21         ------------    Changes    ------------
  22
  23         2000-12-10  Andre Piotrowski
  24
  25         -       reformatted, redesigned
  26         -       MDCT_CHANGE_LEVEL 5
  27 */
  28
  29 /**********************************************************************
  30  * ISO MPEG Audio Subgroup Software Simulation Group (1996)
  31  * ISO 13818-3 MPEG-2 Audio Encoder - Lower Sampling Frequency Extension
  32  *
  33  * $Id: mdct.h,v 1.1 2004/05/08 12:21:08 kramm Exp $
  34  *
  35  * $Log: mdct.h,v $
  36  * Revision 1.1  2004/05/08 12:21:08  kramm
  37  * Version 0.94.1 of the bladeenc mp3 encoder
  38  *
  39  * Revision 1.1  2002/01/10 17:30:01  kramm
  40  * Version 0.94.1 of the bladeenc mp3 encoder
  41  *
  42  * Revision 1.1  1996/02/14 04:04:23  rowlands
  43  * Initial revision
  44  *
  45  * Received from Mike Coleman
  46  **********************************************************************/
  47
  48 #ifndef         __MDCT__
  49 #define         __MDCT__
  50
  51
  52
  53
  54
  55 #define MDCT_CHANGE_LEVEL 5
  56
  57
  58
  59
  60
  61 typedef         double                                  L3SBS[2][3][18][SBLIMIT];   /* [gr][ch] */
  62
  63
  64
  65
  66
  67 extern  int                             fInit_mdct_sub;
  68 extern  int                             fInit_mdct;
  69
  70
  71 extern  int                             gr_idx[3];
  72
  73
  74
  75
  76
  77 void                                    mdct_sub
  78 (
  79         L3SBS                                   *sb_sample,
  80         double                                  (*mdct_freq)[2][576],
  81         int                                             stereo,
  82         III_side_info_t                 *l3_side,
  83         int                                             mode_gr
  84 );
  85
  86
  87
  88 #if MDCT_CHANGE_LEVEL < 5
  89
  90 void                                    mdct
  91 (
  92         double                                  *in,
  93         double                                  *out,
  94         int                                             block_type
  95 );
  96
  97 #else
  98
  99 void                                    mdct
 100 (
 101         double                                  inA[18][32],
 102         double                                  inB[18][32],
 103         int                                             band,
 104         double                                  *out,
 105         int                                             block_type
 106 );
 107
 108 #endif
 109
 110
 111
 112
 113
 114 #endif          /* __MDCT__ */