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sf.h

/* 
 * Copyright 2004 Timo Hirvonen
 * 
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation; either version 2 of the
 * License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
 * 02111-1307, USA.
 */

#ifndef _SF_H
#define     _SF_H

/*
 *  0     1 big_endian 0-1
 *  1     1 is_signed  0-1
 *  2     1 unused     0
 *  3-5   3 bits >> 3  0-7 (* 8 = 0-56)
 *  6-23 18 rate       0-262143
 * 24-31  8 channels   0-255
 */
typedef unsigned int sample_format_t;

#define SF_BIGENDIAN_MASK     0x00000001
#define SF_SIGNED_MASK        0x00000002
#define SF_BITS_MASK          0x00000038
#define SF_RATE_MASK          0x00ffffc0
#define SF_CHANNELS_MASK      0xff000000

#define SF_BIGENDIAN_SHIFT    0
#define SF_SIGNED_SHIFT       1
#define SF_BITS_SHIFT         0
#define SF_RATE_SHIFT         6
#define SF_CHANNELS_SHIFT     24

#define sf_get_bigendian(sf)  (((sf) & SF_BIGENDIAN_MASK) >> SF_BIGENDIAN_SHIFT)
#define sf_get_signed(sf)     (((sf) & SF_SIGNED_MASK   ) >> SF_SIGNED_SHIFT)
#define sf_get_bits(sf)       (((sf) & SF_BITS_MASK     ) >> SF_BITS_SHIFT)
#define sf_get_rate(sf)       (((sf) & SF_RATE_MASK     ) >> SF_RATE_SHIFT)
#define sf_get_channels(sf)   (((sf) & SF_CHANNELS_MASK ) >> SF_CHANNELS_SHIFT)

#define sf_bigendian(val)     (((val) << SF_BIGENDIAN_SHIFT) & SF_BIGENDIAN_MASK)
#define sf_signed(val)        (((val) << SF_SIGNED_SHIFT   ) & SF_SIGNED_MASK)
#define sf_bits(val)          (((val) << SF_BITS_SHIFT     ) & SF_BITS_MASK)
#define sf_rate(val)          (((val) << SF_RATE_SHIFT     ) & SF_RATE_MASK)
#define sf_channels(val)      (((val) << SF_CHANNELS_SHIFT ) & SF_CHANNELS_MASK)

#define sf_get_sample_size(sf)      (sf_get_bits((sf)) >> 3)
#define sf_get_frame_size(sf) (sf_get_sample_size((sf)) * sf_get_channels((sf)))
#define sf_get_second_size(sf)      (sf_get_rate((sf)) * sf_get_frame_size((sf)))

#endif

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