Asterisk - The Open Source Telephony Project  GIT-master-0190e70
format_vox.c
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1 /*
2  * Asterisk -- An open source telephony toolkit.
3  *
4  * Copyright (C) 1999 - 2005, Digium, Inc.
5  *
6  * Mark Spencer <markster@digium.com>
7  *
8  * See http://www.asterisk.org for more information about
9  * the Asterisk project. Please do not directly contact
10  * any of the maintainers of this project for assistance;
11  * the project provides a web site, mailing lists and IRC
12  * channels for your use.
13  *
14  * This program is free software, distributed under the terms of
15  * the GNU General Public License Version 2. See the LICENSE file
16  * at the top of the source tree.
17  */
18 
19 /*! \file
20  *
21  * \brief Flat, binary, ADPCM vox file format.
22  * \arg File name extensions: vox
23  *
24  * \ingroup formats
25  */
26 
27 /*** MODULEINFO
28  <support_level>extended</support_level>
29  ***/
30 
31 #include "asterisk.h"
32 
33 #include "asterisk/mod_format.h"
34 #include "asterisk/module.h"
35 #include "asterisk/endian.h"
36 #include "asterisk/format_cache.h"
37 
38 #define BUF_SIZE 80 /* 80 bytes, 160 samples */
39 #define VOX_SAMPLES 160
40 
41 static struct ast_frame *vox_read(struct ast_filestream *s, int *whennext)
42 {
43  size_t res;
44 
45  /* Send a frame from the file to the appropriate channel */
47  if ((res = fread(s->fr.data.ptr, 1, s->fr.datalen, s->f)) < 1) {
48  if (res) {
49  ast_log(LOG_WARNING, "Short read of %s data (expected %d bytes, read %zu): %s\n",
51  strerror(errno));
52  }
53  return NULL;
54  }
55  *whennext = s->fr.samples = res * 2;
56  s->fr.datalen = res;
57  return &s->fr;
58 }
59 
60 static int vox_write(struct ast_filestream *s, struct ast_frame *f)
61 {
62  int res;
63  if ((res = fwrite(f->data.ptr, 1, f->datalen, s->f)) != f->datalen) {
64  ast_log(LOG_WARNING, "Bad write (%d/%d): %s\n", res, f->datalen, strerror(errno));
65  return -1;
66  }
67  return 0;
68 }
69 
70 static int vox_seek(struct ast_filestream *fs, off_t sample_offset, int whence)
71 {
72  off_t offset = 0, min = 0, cur, max, distance;
73 
74  if ((cur = ftello(fs->f)) < 0) {
75  ast_log(AST_LOG_WARNING, "Unable to determine current position in g719 filestream %p: %s\n", fs, strerror(errno));
76  return -1;
77  }
78 
79  if (fseeko(fs->f, 0, SEEK_END) < 0) {
80  ast_log(AST_LOG_WARNING, "Unable to seek to end of g719 filestream %p: %s\n", fs, strerror(errno));
81  return -1;
82  }
83 
84  if ((max = ftello(fs->f)) < 0) {
85  ast_log(AST_LOG_WARNING, "Unable to determine max position in g719 filestream %p: %s\n", fs, strerror(errno));
86  return -1;
87  }
88 
89  /* have to fudge to frame here, so not fully to sample */
90  distance = sample_offset/2;
91  if (whence == SEEK_SET) {
92  offset = distance;
93  } else if (whence == SEEK_CUR || whence == SEEK_FORCECUR) {
94  offset = distance + cur;
95  } else if (whence == SEEK_END) {
96  offset = max - distance;
97  }
98  if (whence != SEEK_FORCECUR) {
99  offset = (offset > max)?max:offset;
100  offset = (offset < min)?min:offset;
101  }
102  return fseeko(fs->f, offset, SEEK_SET);
103 }
104 
105 static int vox_trunc(struct ast_filestream *fs)
106 {
107  int fd;
108  off_t cur;
109 
110  if ((fd = fileno(fs->f)) < 0) {
111  ast_log(AST_LOG_WARNING, "Unable to determine file descriptor for vox filestream %p: %s\n", fs, strerror(errno));
112  return -1;
113  }
114  if ((cur = ftello(fs->f)) < 0) {
115  ast_log(AST_LOG_WARNING, "Unable to determine current position in vox filestream %p: %s\n", fs, strerror(errno));
116  return -1;
117  }
118  /* Truncate file to current length */
119  return ftruncate(fd, cur);}
120 
121 static off_t vox_tell(struct ast_filestream *fs)
122 {
123  off_t offset;
124  offset = ftello(fs->f) << 1;
125  return offset;
126 }
127 
128 static struct ast_format_def vox_f = {
129  .name = "vox",
130  .exts = "vox",
131  .mime_types = "audio/x-vox",
132  .write = vox_write,
133  .seek = vox_seek,
134  .trunc = vox_trunc,
135  .tell = vox_tell,
136  .read = vox_read,
137  .buf_size = BUF_SIZE + AST_FRIENDLY_OFFSET,
138 };
139 
140 static int load_module(void)
141 {
142  vox_f.format = ast_format_adpcm;
143  if (ast_format_def_register(&vox_f))
146 }
147 
148 static int unload_module(void)
149 {
150  return ast_format_def_unregister(vox_f.name);
151 }
152 
153 AST_MODULE_INFO(ASTERISK_GPL_KEY, AST_MODFLAG_LOAD_ORDER, "Dialogic VOX (ADPCM) File Format",
154  .support_level = AST_MODULE_SUPPORT_EXTENDED,
155  .load = load_module,
156  .unload = unload_module,
157  .load_pri = AST_MODPRI_APP_DEPEND
158 );
static struct ast_frame * vox_read(struct ast_filestream *s, int *whennext)
Definition: format_vox.c:41
Asterisk main include file. File version handling, generic pbx functions.
#define LOG_WARNING
Definition: logger.h:274
union ast_frame::@257 data
static int load_module(void)
Definition: format_vox.c:140
#define AST_LOG_WARNING
Definition: logger.h:279
static int vox_seek(struct ast_filestream *fs, off_t sample_offset, int whence)
Definition: format_vox.c:70
const char * ast_format_get_name(const struct ast_format *format)
Get the name associated with a format.
Definition: format.c:334
#define NULL
Definition: resample.c:96
Each supported file format is described by the following structure.
Definition: mod_format.h:43
struct ast_frame_subclass subclass
Header for providers of file and format handling routines. Clients of these routines should include "...
int ast_format_def_unregister(const char *name)
Unregisters a file format.
Definition: file.c:162
#define ast_log
Definition: astobj2.c:42
#define AST_FRIENDLY_OFFSET
Offset into a frame&#39;s data buffer.
Asterisk architecture endianess compatibility definitions.
#define ast_format_def_register(f)
Definition: mod_format.h:136
struct ast_frame fr
frame produced by read, typically
Definition: mod_format.h:122
struct ast_format * format
Definition: mod_format.h:48
#define AST_FRAME_SET_BUFFER(fr, _base, _ofs, _datalen)
static int unload_module(void)
Definition: format_vox.c:148
int errno
char name[80]
Definition: mod_format.h:44
static struct ast_format_def vox_f
Definition: format_vox.c:128
static int vox_trunc(struct ast_filestream *fs)
Definition: format_vox.c:105
static off_t vox_tell(struct ast_filestream *fs)
Definition: format_vox.c:121
#define SEEK_FORCECUR
Definition: file.h:51
Module has failed to load, may be in an inconsistent state.
Definition: module.h:78
AST_MODULE_INFO(ASTERISK_GPL_KEY, AST_MODFLAG_GLOBAL_SYMBOLS|AST_MODFLAG_LOAD_ORDER, "HTTP Phone Provisioning",.support_level=AST_MODULE_SUPPORT_EXTENDED,.load=load_module,.unload=unload_module,.reload=reload,.load_pri=AST_MODPRI_CHANNEL_DEPEND,.requires="http",)
This structure is allocated by file.c in one chunk, together with buf_size and desc_size bytes of mem...
Definition: mod_format.h:101
Data structure associated with a single frame of data.
struct ast_format * ast_format_adpcm
Built-in cached adpcm format.
Definition: format_cache.c:106
struct ast_format * format
#define ASTERISK_GPL_KEY
The text the key() function should return.
Definition: module.h:46
static int vox_write(struct ast_filestream *s, struct ast_frame *f)
Definition: format_vox.c:60
Asterisk module definitions.
#define min(a, b)
Definition: f2c.h:197
#define BUF_SIZE
Definition: format_vox.c:38
Media Format Cache API.
#define max(a, b)
Definition: f2c.h:198