ref: 86439f26b27ba6ae1a06704181a2dec722001a38
dir: /libfaad/bits.c/
/*
** FAAD - Freeware Advanced Audio Decoder
** Copyright (C) 2002 M. Bakker
**
** 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.
**
** $Id: bits.c,v 1.5 2002/02/18 10:01:05 menno Exp $
**/
#include "common.h"
#include "bits.h"
/* initialize buffer, call once before first getbits or showbits */
void faad_initbits(bitfile *ld, void *buffer)
{
uint32_t tmp;
ld->start = (uint32_t*)buffer;
tmp = *(uint32_t*)buffer;
#ifndef ARCH_IS_BIG_ENDIAN
BSWAP(tmp);
#endif
ld->bufa = tmp;
tmp = *((uint32_t*)buffer + 1);
#ifndef ARCH_IS_BIG_ENDIAN
BSWAP(tmp);
#endif
ld->bufb = tmp;
ld->pos = 0;
ld->tail = ((uint32_t*)buffer + 2);
}
uint32_t faad_get_processed_bits(bitfile *ld)
{
return 8 * (4*(ld->tail - ld->start) - 4) - (32 - ld->pos);
}
uint8_t faad_byte_align(bitfile *ld)
{
uint8_t remainder = (uint8_t)(ld->pos % 8);
if (remainder)
{
faad_flushbits(ld, 8 - remainder);
return (8 - remainder);
}
return 0;
}