sf.h

   1 /*
   2  * Copyright 2004 Timo Hirvonen
   3  *
   4  * This program is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU General Public License as
   6  * published by the Free Software Foundation; either version 2 of the
   7  * License, or (at your option) any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful, but
  10  * WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  * General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, write to the Free Software
  16  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
  17  * 02111-1307, USA.
  18  */
  19
  20 #ifndef _SF_H
  21 #define _SF_H
  22
  23 /*
  24  *  0     1 big_endian 0-1
  25  *  1     1 is_signed  0-1
  26  *  2     1 unused     0
  27  *  3-5   3 bits >> 3  0-7 (* 8 = 0-56)
  28  *  6-23 18 rate       0-262143
  29  * 24-31  8 channels   0-255
  30  */
  31 typedef unsigned int sample_format_t;
  32
  33 #define SF_BIGENDIAN_MASK       0x00000001
  34 #define SF_SIGNED_MASK          0x00000002
  35 #define SF_BITS_MASK            0x00000038
  36 #define SF_RATE_MASK            0x00ffffc0
  37 #define SF_CHANNELS_MASK        0xff000000
  38
  39 #define SF_BIGENDIAN_SHIFT      0
  40 #define SF_SIGNED_SHIFT         1
  41 #define SF_BITS_SHIFT           0
  42 #define SF_RATE_SHIFT           6
  43 #define SF_CHANNELS_SHIFT       24
  44
  45 #define sf_get_bigendian(sf)    (((sf) & SF_BIGENDIAN_MASK) >> SF_BIGENDIAN_SHIFT)
  46 #define sf_get_signed(sf)       (((sf) & SF_SIGNED_MASK   ) >> SF_SIGNED_SHIFT)
  47 #define sf_get_bits(sf)         (((sf) & SF_BITS_MASK     ) >> SF_BITS_SHIFT)
  48 #define sf_get_rate(sf)         (((sf) & SF_RATE_MASK     ) >> SF_RATE_SHIFT)
  49 #define sf_get_channels(sf)     (((sf) & SF_CHANNELS_MASK ) >> SF_CHANNELS_SHIFT)
  50
  51 #define sf_bigendian(val)       (((val) << SF_BIGENDIAN_SHIFT) & SF_BIGENDIAN_MASK)
  52 #define sf_signed(val)          (((val) << SF_SIGNED_SHIFT   ) & SF_SIGNED_MASK)
  53 #define sf_bits(val)            (((val) << SF_BITS_SHIFT     ) & SF_BITS_MASK)
  54 #define sf_rate(val)            (((val) << SF_RATE_SHIFT     ) & SF_RATE_MASK)
  55 #define sf_channels(val)        (((val) << SF_CHANNELS_SHIFT ) & SF_CHANNELS_MASK)
  56
  57 #define sf_get_sample_size(sf)  (sf_get_bits((sf)) >> 3)
  58 #define sf_get_frame_size(sf)   (sf_get_sample_size((sf)) * sf_get_channels((sf)))
  59 #define sf_get_second_size(sf)  (sf_get_rate((sf)) * sf_get_frame_size((sf)))
  60
  61 #endif