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1 office 1 /* G711adecode.c
2 * A-law G.711 codec
3 *
4 * Wireshark - Network traffic analyzer
5 * By Gerald Combs <gerald@wireshark.org>
6 * Copyright 1998 Gerald Combs
7 *
8 * This program is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU General Public License
10 * as published by the Free Software Foundation; either version 2
11 * of the License, or (at your option) any later version.
12 *
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.
17 *
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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
21 */
22  
23 #include "config.h"
24  
25 #include <glib.h>
26  
27 #include "G711adecode.h"
28 #include "G711atable.h"
29  
30 void *
31 codec_g711a_init(void)
32 {
33 return NULL;
34 }
35  
36 void
37 codec_g711a_release(void *ctx _U_)
38 {
39  
40 }
41  
42 unsigned
43 codec_g711a_get_channels(void *ctx _U_)
44 {
45 return 1;
46 }
47  
48 unsigned
49 codec_g711a_get_frequency(void *ctx _U_)
50 {
51 return 8000;
52 }
53  
54 size_t
55 codec_g711a_decode(void *ctx _U_, const void *input, size_t inputSizeBytes, void *output,
56 size_t *outputSizeBytes)
57 {
58 const guint8 *dataIn = (const guint8 *) input;
59 gint16 *dataOut = (gint16 *) output;
60 size_t i;
61  
62 if (!output || !outputSizeBytes) {
63 return inputSizeBytes * 2;
64 }
65  
66 for (i = 0; i < inputSizeBytes; i++)
67 {
68 dataOut[i] = alaw_exp_table[dataIn[i]];
69 }
70  
71 *outputSizeBytes = inputSizeBytes * 2;
72 return inputSizeBytes * 2;
73 }
74  
75 /*
76 * Editor modelines - http://www.wireshark.org/tools/modelines.html
77 *
78 * Local variables:
79 * c-basic-offset: 4
80 * tab-width: 8
81 * indent-tabs-mode: nil
82 * End:
83 *
84 * vi: set shiftwidth=4 tabstop=8 expandtab:
85 * :indentSize=4:tabSize=8:noTabs=true:
86 */