1 /*****************************************************************************
2 * audio_bit_stream.h: getbits functions for the audio 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
16 * GNU General Public License for more details.
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111, USA.
21 *****************************************************************************/
23 static __inline__ u8 GetByte (adec_bit_stream_t * p_bit_stream)
25 /* Are there some bytes left in the current buffer ? */
26 if (p_bit_stream->byte_stream.p_byte >= p_bit_stream->byte_stream.p_end) {
27 /* no, switch to next buffer */
28 adec_byte_stream_next (&p_bit_stream->byte_stream);
31 p_bit_stream->total_bytes_read++;
33 return *(p_bit_stream->byte_stream.p_byte++);
36 static __inline__ void NeedBits (adec_bit_stream_t * p_bit_stream, int i_bits)
38 while (p_bit_stream->i_available < i_bits) {
39 p_bit_stream->buffer |=
40 ((u32)GetByte (p_bit_stream)) << (24 - p_bit_stream->i_available);
41 p_bit_stream->i_available += 8;
45 static __inline__ void DumpBits (adec_bit_stream_t * p_bit_stream, int i_bits)
47 p_bit_stream->buffer <<= i_bits;
48 p_bit_stream->i_available -= i_bits;