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path: root/core/multimedia/opieplayer/libmad/stream.c
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-rw-r--r--core/multimedia/opieplayer/libmad/stream.c123
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diff --git a/core/multimedia/opieplayer/libmad/stream.c b/core/multimedia/opieplayer/libmad/stream.c
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1/*
2 * mad - MPEG audio decoder
3 * Copyright (C) 2000-2001 Robert Leslie
4 *
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation; either version 2 of the License, or
8 * (at your option) any later version.
9 *
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
18 *
19 * $Id$
20 */
21
22# ifdef HAVE_CONFIG_H
23# include "libmad_config.h"
24# endif
25
26# include "libmad_global.h"
27
28# include <stdlib.h>
29
30# include "bit.h"
31# include "stream.h"
32
33/*
34 * NAME:stream->init()
35 * DESCRIPTION:initialize stream struct
36 */
37void mad_stream_init(struct mad_stream *stream)
38{
39 stream->buffer = 0;
40 stream->bufend = 0;
41 stream->skiplen = 0;
42
43 stream->sync = 0;
44 stream->freerate = 0;
45
46 stream->this_frame = 0;
47 stream->next_frame = 0;
48 mad_bit_init(&stream->ptr, 0);
49
50 mad_bit_init(&stream->anc_ptr, 0);
51 stream->anc_bitlen = 0;
52
53 stream->main_data = 0;
54 stream->md_len = 0;
55
56 stream->options = 0;
57 stream->error = 0;
58}
59
60/*
61 * NAME:stream->finish()
62 * DESCRIPTION:deallocate any dynamic memory associated with stream
63 */
64void mad_stream_finish(struct mad_stream *stream)
65{
66 if (stream->main_data) {
67 free(stream->main_data);
68 stream->main_data = 0;
69 }
70
71 mad_bit_finish(&stream->anc_ptr);
72 mad_bit_finish(&stream->ptr);
73}
74
75/*
76 * NAME:stream->buffer()
77 * DESCRIPTION:set stream buffer pointers
78 */
79void mad_stream_buffer(struct mad_stream *stream,
80 unsigned char const *buffer, unsigned long length)
81{
82 stream->buffer = buffer;
83 stream->bufend = buffer + length;
84
85 stream->this_frame = buffer;
86 stream->next_frame = buffer;
87
88 stream->sync = 1;
89
90 mad_bit_init(&stream->ptr, buffer);
91}
92
93/*
94 * NAME:stream->skip()
95 * DESCRIPTION:arrange to skip bytes before the next frame
96 */
97void mad_stream_skip(struct mad_stream *stream, unsigned long length)
98{
99 stream->skiplen += length;
100}
101
102/*
103 * NAME:stream->sync()
104 * DESCRIPTION:locate the next stream sync word
105 */
106int mad_stream_sync(struct mad_stream *stream)
107{
108 register unsigned char const *ptr, *end;
109
110 ptr = mad_bit_nextbyte(&stream->ptr);
111 end = stream->bufend;
112
113 while (ptr < end - 1 &&
114 !(ptr[0] == 0xff && (ptr[1] & 0xe0) == 0xe0))
115 ++ptr;
116
117 if (end - ptr < MAD_BUFFER_GUARD)
118 return -1;
119
120 mad_bit_init(&stream->ptr, ptr);
121
122 return 0;
123}