59d6b08d9c
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@14886 a1c6a512-1295-4272-9138-f99709370657
54 lines
1.8 KiB
C
54 lines
1.8 KiB
C
/*
|
|
* bitstream.h
|
|
* 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 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
|
|
*/
|
|
|
|
#define swab32(x) (betoh32(x))
|
|
|
|
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);
|
|
}
|