/*

 * bitstream.h

 * Copyright (C) 2000-2002 Michel Lespinasse <walken@zoy.org>

 * Copyright (C) 1999-2000 Aaron Holtzman <aholtzma@ess.engr.uvic.ca>

 *

 * This file is part of a52dec, a free ATSC A-52 stream decoder.

 * See http://liba52.sourceforge.net/ for updates.

 *

 * a52dec 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.

 *

 * a52dec 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

 */

/* (stolen from the kernel) */

#ifdef WORDS_BIGENDIAN

#	define swab32(x) (x)

#else

#	if 0 && defined (__i386__)

#	define swab32(x) __i386_swab32(x)

	static inline const uint32_t __i386_swab32(uint32_t x)

	{

		__asm__("bswap %0" : "=r" (x) : "0" (x));

		return x;

	}

#	else

#	define swab32(x)\

((((uint8_t*)&x)[0] << 24) | (((uint8_t*)&x)[1] << 16) |  \

 (((uint8_t*)&x)[2] << 8)  | (((uint8_t*)&x)[3]))

#	endif

#endif

void a52_bitstream_set_ptr (a52_state_t * state, uint8_t * buf);

uint32_t a52_bitstream_get_bh (a52_state_t * state, uint32_t num_bits);

int32_t a52_bitstream_get_bh_2 (a52_state_t * state, uint32_t num_bits);

static inline uint32_t bitstream_get (a52_state_t * state, uint32_t num_bits)

{

    uint32_t result;

    if (num_bits < state->bits_left) {

	result = (state->current_word << (32 - state->bits_left)) >> (32 - num_bits);

	state->bits_left -= num_bits;

	return result;

    }

    return a52_bitstream_get_bh (state, num_bits);

}

static inline int32_t bitstream_get_2 (a52_state_t * state, uint32_t num_bits)

{

    int32_t result;

    if (num_bits < state->bits_left) {

	result = (((int32_t)state->current_word) << (32 - state->bits_left)) >> (32 - num_bits);

	state->bits_left -= num_bits;

	return result;

    }

    return a52_bitstream_get_bh_2 (state, num_bits);

}