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/*
** 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 1.2 2002/08/09 22:36:36 miguelfreitas Exp $
**/
#include "common.h"
#include <stdlib.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;
}
uint8_t *faad_getbitbuffer(bitfile *ld, uint16_t bits
DEBUGDEC)
{
uint16_t i, temp;
uint16_t bytes = bits / 8;
uint8_t remainder = bits % 8;
uint8_t *buffer = (uint8_t*)malloc((bytes+1)*sizeof(uint8_t));
for (i = 0; i < bytes; i++)
{
buffer[i] = faad_getbits(ld, 8 DEBUGVAR(print,var,dbg));
}
if (remainder)
{
temp = faad_getbits(ld, remainder DEBUGVAR(print,var,dbg)) << (8-remainder);
buffer[bytes] = temp;
}
return buffer;
}
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