1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
|
/* amrdecode.c
* AMR codec
*
* Wireshark - Network traffic analyzer
* By Gerald Combs <gerald@wireshark.org>
* Copyright 1998 Gerald Combs
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include "config.h"
#include <glib.h>
#include <string.h>
#include "amrdecode.h"
#include "ws_attributes.h"
#include <opencore-amrnb/interf_dec.h>
void *
codec_amr_init(void)
{
void *state;
state = Decoder_Interface_init();
return state;
}
void
codec_amr_release(void *state)
{
Decoder_Interface_exit(state);
}
unsigned
codec_amr_get_channels(void *ctx _U_)
{
return 1;
}
unsigned
codec_amr_get_frequency(void *ctx _U_)
{
return 8000;
}
size_t
codec_amr_decode(void *state, const void *input, size_t inputSizeBytes, void *output,
size_t *outputSizeBytes)
{
int mode;
unsigned packet_size;
static const uint8_t block_size[16] = {12, 13, 15, 17, 19, 20, 26, 31, 5, 0, 0, 0, 0, 0, 0, 0};
/* First byte is CMR, second is the Payload TOC */
mode = (((uint8_t *)input)[1] >> 3) & 0x0F;
packet_size = block_size[mode] + 2;
if (!output || !outputSizeBytes)
return 160*2;
*outputSizeBytes = 160 * 2; /* 160 frames, two byte per frame, 20ms */
/* If the size is screwed up, insert silence */
if (packet_size > inputSizeBytes) {
memset(output, 0, *outputSizeBytes);
return *outputSizeBytes;
}
Decoder_Interface_Decode(state, (const unsigned char *)input+1, (short *)output, 0);
return *outputSizeBytes;
}
/*
* Editor modelines - http://www.wireshark.org/tools/modelines.html
*
* Local variables:
* c-basic-offset: 4
* tab-width: 8
* indent-tabs-mode: nil
* End:
*
* vi: set shiftwidth=4 tabstop=8 expandtab:
* :indentSize=4:tabSize=8:noTabs=true:
*/
|
