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/*
* FAAD - Freeware Advanced Audio Decoder
* Copyright (C) 2001 Menno Bakker
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
* $Id: bits.h,v 1.5 2005/05/09 21:29:56 wmaycisco Exp $
*/
#ifndef __BITS_H__
#define __BITS_H__ 1
#include "all.h"
#ifdef __cplusplus
extern "C" {
#endif
typedef struct _bitfile2
{
/* bit input */
unsigned char *buffer;
unsigned char *rdptr;
int m_alignment_offset;
int incnt;
int bitcnt;
int framebits;
int maxbits;
} bitfile;
void faad_initbits(bitfile *ld, unsigned char *buffer, uint32_t buflen);
uint32_t faad_getbits(bitfile *ld, int n);
uint32_t faad_getbits_fast(bitfile *ld, int n);
uint32_t faad_get1bit(bitfile *ld);
uint32_t faad_byte_align(bitfile *ld);
int faad_get_processed_bits(bitfile *ld);
int faad_bits_done(bitfile *ld);
void faad_bitdump(bitfile *ld);
extern unsigned int faad_bit_msk[33];
#define _SWAP(a) ((a[0] << 24) | (a[1] << 16) | (a[2] << 8) | a[3])
static __inline uint32_t faad_showbits(bitfile *ld, int n)
{
unsigned char *v;
int rbit = 32 - ld->bitcnt;
uint32_t b;
v = ld->rdptr;
b = _SWAP(v);
return ((b & faad_bit_msk[rbit]) >> (rbit-n));
}
static __inline void faad_flushbits(bitfile *ld, int n)
{
ld->bitcnt += n;
if (ld->bitcnt >= 8) {
ld->rdptr += (ld->bitcnt>>3);
ld->bitcnt &= 7;
}
ld->framebits += n;
}
#ifdef __cplusplus
}
#endif
#endif
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