1 /* Gstreamer
2 * Copyright (C) <2011> Intel Corporation
3 * Copyright (C) <2011> Collabora Ltd.
4 * Copyright (C) <2011> Thibault Saunier <thibault.saunier@collabora.com>
5 *
6 * This library is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Library General Public
8 * License as published by the Free Software Foundation; either
9 * version 2 of the License, or (at your option) any later version.
10 *
11 * This library is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Library General Public License for more details.
15 *
16 * You should have received a copy of the GNU Library General Public
17 * License along with this library; if not, write to the
18 * Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
19 * Boston, MA 02110-1301, USA.
20 */
21 #ifdef HAVE_CONFIG_H
22 #include "config.h"
23 #endif
24
25 #include "parserutils.h"
26
27 gboolean
decode_vlc(GstBitReader * br,guint * res,const VLCTable * table,guint length)28 decode_vlc (GstBitReader * br, guint * res, const VLCTable * table,
29 guint length)
30 {
31 guint8 i;
32 guint cbits = 0;
33 guint32 value = 0;
34
35 for (i = 0; i < length; i++) {
36 if (cbits != table[i].cbits) {
37 cbits = table[i].cbits;
38 if (!gst_bit_reader_peek_bits_uint32 (br, &value, cbits)) {
39 goto failed;
40 }
41 }
42
43 if (value == table[i].cword) {
44 SKIP (br, cbits);
45 if (res)
46 *res = table[i].value;
47
48 return TRUE;
49 }
50 }
51
52 GST_DEBUG ("Did not find code");
53
54 failed:
55 {
56 GST_WARNING ("Could not decode VLC returning");
57
58 return FALSE;
59 }
60 }
61