1 /*****************************************************************************
2 * ac3_decoder.c: core ac3 decoder
3 *****************************************************************************
4 * Copyright (C) 1999, 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 *****************************************************************************/
24 #include "int_types.h"
25 #include "ac3_decoder.h"
26 #include "ac3_internal.h"
28 int ac3_init (ac3dec_t * p_ac3dec)
30 //p_ac3dec->bit_stream.buffer = 0;
31 //p_ac3dec->bit_stream.i_available = 0;
36 int ac3_decode_frame (ac3dec_t * p_ac3dec, s16 * buffer)
40 if (parse_bsi (p_ac3dec))
43 for (i = 0; i < 6; i++) {
44 if (parse_audblk (p_ac3dec, i))
46 if (exponent_unpack (p_ac3dec))
48 bit_allocate (p_ac3dec);
49 mantissa_unpack (p_ac3dec);
50 if (p_ac3dec->bsi.acmod == 0x2)
53 downmix (p_ac3dec, buffer);
58 parse_auxdata (p_ac3dec);