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/*
* bitstream.h
* Copyright (C) 2004 Gildas Bazin <gbazin@videolan.org>
* Copyright (C) 2000-2003 Michel Lespinasse <walken@zoy.org>
* Copyright (C) 1999-2000 Aaron Holtzman <aholtzma@ess.engr.uvic.ca>
*
* This file is part of libdca, a free DTS Coherent Acoustics stream decoder.
* See http://www.videolan.org/developers/libdca.html for updates.
*
* libdca 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.
*
* libdca 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.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#ifdef WORDS_BIGENDIAN
# define swab32(x) (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
#ifdef WORDS_BIGENDIAN
# define swable32(x)\
((((uint8_t*)&x)[0] << 16) | (((uint8_t*)&x)[1] << 24) | \
(((uint8_t*)&x)[2]) | (((uint8_t*)&x)[3] << 8))
#else
# define swable32(x)\
((((uint32_t)x) >> 16) | (((uint32_t)x) << 16))
#endif
void dca_bitstream_init (dca_state_t * state, uint8_t * buf, int word_mode,
int endian_mode);
uint32_t dca_bitstream_get_bh (dca_state_t * state, uint32_t num_bits);
static inline uint32_t bitstream_get (dca_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 dca_bitstream_get_bh (state, num_bits);
}
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