1 /*****************************************************************************
2 * ac3_bit_stream.h: getbits functions for the ac3 decoder
3 *****************************************************************************
4 * Copyright (C) 2000 VideoLAN
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * General Public License for more details.
18 * You should have received a copy of the GNU General Public
19 * License along with this program; if not, write to the
20 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
21 * Boston, MA 02111-1307, USA.
22 *****************************************************************************/
24 static __inline__ u8 GetByte (ac3_byte_stream_t * p_byte_stream)
26 /* Are there some bytes left in the current buffer ? */
27 if (p_byte_stream->p_byte >= p_byte_stream->p_end) {
28 /* no, switch to next buffer */
29 ac3_byte_stream_next (p_byte_stream);
32 return *(p_byte_stream->p_byte++);
35 static __inline__ void NeedBits (ac3_bit_stream_t * p_bit_stream, int i_bits)
37 while (p_bit_stream->i_available < i_bits) {
38 p_bit_stream->buffer |=
39 ((u32)GetByte (&p_bit_stream->byte_stream)) << (24 - p_bit_stream->i_available);
40 p_bit_stream->i_available += 8;
44 static __inline__ void DumpBits (ac3_bit_stream_t * p_bit_stream, int i_bits)
46 p_bit_stream->buffer <<= i_bits;
47 p_bit_stream->i_available -= i_bits;
48 p_bit_stream->total_bits_read += i_bits;