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
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
|
/*
* Asterisk -- An open source telephony toolkit.
*
* Copyright (C) 1999 - 2005, Digium, Inc.
*
* Mark Spencer <markster@digium.com>
*
* See http://www.asterisk.org for more information about
* the Asterisk project. Please do not directly contact
* any of the maintainers of this project for assistance;
* the project provides a web site, mailing lists and IRC
* channels for your use.
*
* This program is free software, distributed under the terms of
* the GNU General Public License Version 2. See the LICENSE file
* at the top of the source tree.
*/
/*!
* \file
*
* \brief Old-style G.723.1 frame/timestamp format.
*
* \arg Extensions: g723, g723sf
* \ingroup formats
*/
#include "asterisk.h"
ASTERISK_FILE_VERSION(__FILE__, "$Revision$")
#include "asterisk/mod_format.h"
#include "asterisk/module.h"
#define G723_MAX_SIZE 1024
static struct ast_frame *g723_read(struct ast_filestream *s, int *whennext)
{
unsigned short size;
int res;
int delay;
/* Read the delay for the next packet, and schedule again if necessary */
/* XXX is this ignored ? */
if (fread(&delay, 1, 4, s->f) == 4)
delay = ntohl(delay);
else
delay = -1;
if (fread(&size, 1, 2, s->f) != 2) {
/* Out of data, or the file is no longer valid. In any case
go ahead and stop the stream */
return NULL;
}
/* Looks like we have a frame to read from here */
size = ntohs(size);
if (size > G723_MAX_SIZE) {
ast_log(LOG_WARNING, "Size %d is invalid\n", size);
/* The file is apparently no longer any good, as we
shouldn't ever get frames even close to this
size. */
return NULL;
}
/* Read the data into the buffer */
s->fr.frametype = AST_FRAME_VOICE;
ast_format_set(&s->fr.subclass.format, AST_FORMAT_G723_1, 0);
s->fr.mallocd = 0;
AST_FRAME_SET_BUFFER(&s->fr, s->buf, AST_FRIENDLY_OFFSET, size);
if ((res = fread(s->fr.data.ptr, 1, s->fr.datalen, s->f)) != size) {
ast_log(LOG_WARNING, "Short read (%d of %d bytes) (%s)!\n", res, size, strerror(errno));
return NULL;
}
*whennext = s->fr.samples = 240;
return &s->fr;
}
static int g723_write(struct ast_filestream *s, struct ast_frame *f)
{
uint32_t delay;
uint16_t size;
int res;
/* XXX there used to be a check s->fr means a read stream */
if (f->frametype != AST_FRAME_VOICE) {
ast_log(LOG_WARNING, "Asked to write non-voice frame!\n");
return -1;
}
if (f->subclass.format.id != AST_FORMAT_G723_1) {
ast_log(LOG_WARNING, "Asked to write non-g723 frame!\n");
return -1;
}
delay = 0;
if (f->datalen <= 0) {
ast_log(LOG_WARNING, "Short frame ignored (%d bytes long?)\n", f->datalen);
return 0;
}
if ((res = fwrite(&delay, 1, 4, s->f)) != 4) {
ast_log(LOG_WARNING, "Unable to write delay: res=%d (%s)\n", res, strerror(errno));
return -1;
}
size = htons(f->datalen);
if ((res = fwrite(&size, 1, 2, s->f)) != 2) {
ast_log(LOG_WARNING, "Unable to write size: res=%d (%s)\n", res, strerror(errno));
return -1;
}
if ((res = fwrite(f->data.ptr, 1, f->datalen, s->f)) != f->datalen) {
ast_log(LOG_WARNING, "Unable to write frame: res=%d (%s)\n", res, strerror(errno));
return -1;
}
return 0;
}
static int g723_seek(struct ast_filestream *fs, off_t sample_offset, int whence)
{
return -1;
}
static int g723_trunc(struct ast_filestream *fs)
{
/* Truncate file to current length */
if (ftruncate(fileno(fs->f), ftello(fs->f)) < 0)
return -1;
return 0;
}
static off_t g723_tell(struct ast_filestream *fs)
{
return -1;
}
static struct ast_format_def g723_1_f = {
.name = "g723sf",
.exts = "g723|g723sf",
.write = g723_write,
.seek = g723_seek,
.trunc = g723_trunc,
.tell = g723_tell,
.read = g723_read,
.buf_size = G723_MAX_SIZE + AST_FRIENDLY_OFFSET,
};
static int load_module(void)
{
ast_format_set(&g723_1_f.format, AST_FORMAT_G723_1, 0);
if (ast_format_def_register(&g723_1_f))
return AST_MODULE_LOAD_FAILURE;
return AST_MODULE_LOAD_SUCCESS;
}
static int unload_module(void)
{
return ast_format_def_unregister(g723_1_f.name);
}
AST_MODULE_INFO(ASTERISK_GPL_KEY, AST_MODFLAG_LOAD_ORDER, "G.723.1 Simple Timestamp File Format",
.load = load_module,
.unload = unload_module,
.load_pri = AST_MODPRI_APP_DEPEND
);
|
