Asterisk - The Open Source Telephony Project GIT-master-0bf3178
Data Structures | Macros | Functions | Variables
format_g726.c File Reference

Headerless G.726 (16/24/32/40kbps) data format for Asterisk. More...

#include "asterisk.h"
#include "asterisk/mod_format.h"
#include "asterisk/module.h"
#include "asterisk/endian.h"
#include "asterisk/format_cache.h"
Include dependency graph for format_g726.c:

Go to the source code of this file.

Data Structures

struct  g726_desc
 

Macros

#define BUF_SIZE   (5*FRAME_TIME) /* max frame size in bytes ? */
 
#define FRAME_TIME   10 /* 10 ms size */
 
#define RATE_16   3
 
#define RATE_24   2
 
#define RATE_32   1
 
#define RATE_40   0
 

Functions

static void __reg_module (void)
 
static void __unreg_module (void)
 
struct ast_moduleAST_MODULE_SELF_SYM (void)
 
static int g726_16_open (struct ast_filestream *s)
 
static int g726_16_rewrite (struct ast_filestream *s, const char *comment)
 
static int g726_24_open (struct ast_filestream *s)
 
static int g726_24_rewrite (struct ast_filestream *s, const char *comment)
 
static int g726_32_open (struct ast_filestream *s)
 
static int g726_32_rewrite (struct ast_filestream *s, const char *comment)
 
static int g726_40_open (struct ast_filestream *s)
 
static int g726_40_rewrite (struct ast_filestream *s, const char *comment)
 
static int g726_open (struct ast_filestream *tmp, int rate)
 
static struct ast_frameg726_read (struct ast_filestream *s, int *whennext)
 
static int g726_seek (struct ast_filestream *fs, off_t sample_offset, int whence)
 
static off_t g726_tell (struct ast_filestream *fs)
 
static int g726_trunc (struct ast_filestream *fs)
 
static int g726_write (struct ast_filestream *s, struct ast_frame *f)
 
static int load_module (void)
 
static int unload_module (void)
 

Variables

static struct ast_module_info __mod_info = { .name = AST_MODULE, .flags = AST_MODFLAG_LOAD_ORDER , .description = "Raw G.726 (16/24/32/40kbps) data" , .key = "This paragraph is copyright (c) 2006 by Digium, Inc. \In order for your module to load, it must return this \key via a function called \"key\". Any code which \includes this paragraph must be licensed under the GNU \General Public License version 2 or later (at your \option). In addition to Digium's general reservations \of rights, Digium expressly reserves the right to \allow other parties to license this paragraph under \different terms. Any use of Digium, Inc. trademarks or \logos (including \"Asterisk\" or \"Digium\") without \express written permission of Digium, Inc. is prohibited.\n" , .buildopt_sum = AST_BUILDOPT_SUM, .support_level = AST_MODULE_SUPPORT_CORE, .load = load_module, .unload = unload_module, .load_pri = AST_MODPRI_APP_DEPEND }
 
static const struct ast_module_infoast_module_info = &__mod_info
 
static struct ast_format_def f_def []
 
static int frame_size [4]
 

Detailed Description

Headerless G.726 (16/24/32/40kbps) data format for Asterisk.

File name extensions:

Definition in file format_g726.c.

Macro Definition Documentation

◆ BUF_SIZE

#define BUF_SIZE   (5*FRAME_TIME) /* max frame size in bytes ? */

Definition at line 50 of file format_g726.c.

◆ FRAME_TIME

#define FRAME_TIME   10 /* 10 ms size */

Definition at line 48 of file format_g726.c.

◆ RATE_16

#define RATE_16   3

Definition at line 45 of file format_g726.c.

◆ RATE_24

#define RATE_24   2

Definition at line 44 of file format_g726.c.

◆ RATE_32

#define RATE_32   1

Definition at line 43 of file format_g726.c.

◆ RATE_40

#define RATE_40   0

Definition at line 42 of file format_g726.c.

Function Documentation

◆ __reg_module()

static void __reg_module ( void  )
static

Definition at line 289 of file format_g726.c.

◆ __unreg_module()

static void __unreg_module ( void  )
static

Definition at line 289 of file format_g726.c.

◆ AST_MODULE_SELF_SYM()

struct ast_module * AST_MODULE_SELF_SYM ( void  )

Definition at line 289 of file format_g726.c.

◆ g726_16_open()

static int g726_16_open ( struct ast_filestream s)
static

Definition at line 89 of file format_g726.c.

90{
91 return g726_open(s, RATE_16);
92}
#define RATE_16
Definition: format_g726.c:45
static int g726_open(struct ast_filestream *tmp, int rate)
Definition: format_g726.c:66

References g726_open(), and RATE_16.

◆ g726_16_rewrite()

static int g726_16_rewrite ( struct ast_filestream s,
const char *  comment 
)
static

Definition at line 109 of file format_g726.c.

110{
111 return g726_open(s, RATE_16);
112}

References g726_open(), and RATE_16.

◆ g726_24_open()

static int g726_24_open ( struct ast_filestream s)
static

Definition at line 84 of file format_g726.c.

85{
86 return g726_open(s, RATE_24);
87}
#define RATE_24
Definition: format_g726.c:44

References g726_open(), and RATE_24.

◆ g726_24_rewrite()

static int g726_24_rewrite ( struct ast_filestream s,
const char *  comment 
)
static

Definition at line 104 of file format_g726.c.

105{
106 return g726_open(s, RATE_24);
107}

References g726_open(), and RATE_24.

◆ g726_32_open()

static int g726_32_open ( struct ast_filestream s)
static

Definition at line 79 of file format_g726.c.

80{
81 return g726_open(s, RATE_32);
82}
#define RATE_32
Definition: format_g726.c:43

References g726_open(), and RATE_32.

◆ g726_32_rewrite()

static int g726_32_rewrite ( struct ast_filestream s,
const char *  comment 
)
static

Definition at line 99 of file format_g726.c.

100{
101 return g726_open(s, RATE_32);
102}

References g726_open(), and RATE_32.

◆ g726_40_open()

static int g726_40_open ( struct ast_filestream s)
static

Definition at line 74 of file format_g726.c.

75{
76 return g726_open(s, RATE_40);
77}
#define RATE_40
Definition: format_g726.c:42

References g726_open(), and RATE_40.

◆ g726_40_rewrite()

static int g726_40_rewrite ( struct ast_filestream s,
const char *  comment 
)
static

Definition at line 94 of file format_g726.c.

95{
96 return g726_open(s, RATE_40);
97}

References g726_open(), and RATE_40.

◆ g726_open()

static int g726_open ( struct ast_filestream tmp,
int  rate 
)
static

Definition at line 66 of file format_g726.c.

67{
68 struct g726_desc *s = (struct g726_desc *)tmp->_private;
69 s->rate = rate;
70 ast_debug(1, "Created filestream G.726-%dk.\n", 40 - s->rate * 8);
71 return 0;
72}
static int tmp()
Definition: bt_open.c:389
#define ast_debug(level,...)
Log a DEBUG message.

References ast_debug, g726_desc::rate, and tmp().

Referenced by g726_16_open(), g726_16_rewrite(), g726_24_open(), g726_24_rewrite(), g726_32_open(), g726_32_rewrite(), g726_40_open(), and g726_40_rewrite().

◆ g726_read()

static struct ast_frame * g726_read ( struct ast_filestream s,
int *  whennext 
)
static

Definition at line 118 of file format_g726.c.

119{
120 size_t res;
121 struct g726_desc *fs = (struct g726_desc *)s->_private;
122
123 /* Send a frame from the file to the appropriate channel */
125 s->fr.samples = 8 * FRAME_TIME;
126 if ((res = fread(s->fr.data.ptr, 1, s->fr.datalen, s->f)) != s->fr.datalen) {
127 if (res) {
128 ast_log(LOG_WARNING, "Short read of %s data (expected %d bytes, read %zu): %s\n",
130 strerror(errno));
131 }
132 return NULL;
133 }
134 *whennext = s->fr.samples;
135 return &s->fr;
136}
#define ast_log
Definition: astobj2.c:42
const char * ast_format_get_name(const struct ast_format *format)
Get the name associated with a format.
Definition: format.c:334
#define FRAME_TIME
Definition: format_g726.c:48
static int frame_size[4]
Definition: format_g726.c:52
#define AST_FRAME_SET_BUFFER(fr, _base, _ofs, _datalen)
#define AST_FRIENDLY_OFFSET
Offset into a frame's data buffer.
#define LOG_WARNING
int errno
#define NULL
Definition: resample.c:96
struct ast_frame fr
frame produced by read, typically
Definition: mod_format.h:122
void * _private
Definition: mod_format.h:124
struct ast_format * format
struct ast_frame_subclass subclass
union ast_frame::@226 data

References ast_filestream::_private, ast_format_get_name(), AST_FRAME_SET_BUFFER, AST_FRIENDLY_OFFSET, ast_log, ast_filestream::buf, ast_frame::data, ast_frame::datalen, errno, ast_filestream::f, ast_frame_subclass::format, ast_filestream::fr, frame_size, FRAME_TIME, LOG_WARNING, NULL, ast_frame::ptr, g726_desc::rate, ast_frame::samples, and ast_frame::subclass.

◆ g726_seek()

static int g726_seek ( struct ast_filestream fs,
off_t  sample_offset,
int  whence 
)
static

Definition at line 156 of file format_g726.c.

157{
158 off_t offset = 0, min = 0, cur, max, distance;
159
160 if ((cur = ftello(fs->f)) < 0) {
161 ast_log(AST_LOG_WARNING, "Unable to determine current position in g726 filestream %p: %s\n", fs, strerror(errno));
162 return -1;
163 }
164
165 if (fseeko(fs->f, 0, SEEK_END) < 0) {
166 ast_log(AST_LOG_WARNING, "Unable to seek to end of g726 filestream %p: %s\n", fs, strerror(errno));
167 return -1;
168 }
169
170 if ((max = ftello(fs->f)) < 0) {
171 ast_log(AST_LOG_WARNING, "Unable to determine max position in g726 filestream %p: %s\n", fs, strerror(errno));
172 return -1;
173 }
174
175 /* have to fudge to frame here, so not fully to sample */
176 distance = sample_offset / 2;
177 if (whence == SEEK_SET) {
178 offset = distance;
179 } else if (whence == SEEK_CUR || whence == SEEK_FORCECUR) {
180 offset = distance + cur;
181 } else if (whence == SEEK_END) {
182 offset = max - distance;
183 }
184
185 if (whence != SEEK_FORCECUR) {
186 offset = offset > max ? max : offset;
187 offset = offset < min ? min : offset;
188 }
189 return fseeko(fs->f, offset, SEEK_SET);
190}
#define min(a, b)
Definition: f2c.h:197
#define max(a, b)
Definition: f2c.h:198
#define SEEK_FORCECUR
Definition: file.h:51
#define AST_LOG_WARNING

References ast_log, AST_LOG_WARNING, errno, ast_filestream::f, max, min, and SEEK_FORCECUR.

◆ g726_tell()

static off_t g726_tell ( struct ast_filestream fs)
static

Definition at line 197 of file format_g726.c.

198{
199 return ftello(fs->f) << 1;
200}

References ast_filestream::f.

◆ g726_trunc()

static int g726_trunc ( struct ast_filestream fs)
static

Definition at line 192 of file format_g726.c.

193{
194 return -1;
195}

◆ g726_write()

static int g726_write ( struct ast_filestream s,
struct ast_frame f 
)
static

Definition at line 138 of file format_g726.c.

139{
140 int res;
141 struct g726_desc *fs = (struct g726_desc *)s->_private;
142
143 if (f->datalen % frame_size[fs->rate]) {
144 ast_log(LOG_WARNING, "Invalid data length %d, should be multiple of %d\n",
145 f->datalen, frame_size[fs->rate]);
146 return -1;
147 }
148 if ((res = fwrite(f->data.ptr, 1, f->datalen, s->f)) != f->datalen) {
149 ast_log(LOG_WARNING, "Bad write (%d/%d): %s\n",
150 res, frame_size[fs->rate], strerror(errno));
151 return -1;
152 }
153 return 0;
154}
if(!yyg->yy_init)
Definition: ast_expr2f.c:854

References ast_filestream::_private, ast_log, ast_frame::data, ast_frame::datalen, errno, ast_filestream::f, frame_size, if(), LOG_WARNING, ast_frame::ptr, and g726_desc::rate.

◆ load_module()

static int load_module ( void  )
static

Definition at line 269 of file format_g726.c.

270{
271 int i;
272
273 for (i = 0; f_def[i].desc_size ; i++) {
275 if (ast_format_def_register(&f_def[i])) { /* errors are fatal */
276 ast_log(LOG_WARNING, "Failed to register format %s.\n", f_def[i].name);
279 }
280 }
282}
struct ast_format * ast_format_g726
Built-in cached g726 format.
Definition: format_cache.c:111
static int unload_module(void)
Definition: format_g726.c:258
static struct ast_format_def f_def[]
Definition: format_g726.c:202
static const char name[]
Definition: format_mp3.c:68
#define ast_format_def_register(f)
Definition: mod_format.h:136
@ AST_MODULE_LOAD_SUCCESS
Definition: module.h:70
@ AST_MODULE_LOAD_DECLINE
Module has failed to load, may be in an inconsistent state.
Definition: module.h:78
struct ast_format * format
Definition: mod_format.h:48

References ast_format_def_register, ast_format_g726, ast_log, AST_MODULE_LOAD_DECLINE, AST_MODULE_LOAD_SUCCESS, ast_format_def::desc_size, f_def, ast_format_def::format, LOG_WARNING, name, and unload_module().

◆ unload_module()

static int unload_module ( void  )
static

Definition at line 258 of file format_g726.c.

259{
260 int i;
261
262 for (i = 0; f_def[i].desc_size ; i++) {
264 ast_log(LOG_WARNING, "Failed to unregister format %s.\n", f_def[i].name);
265 }
266 return(0);
267}
int ast_format_def_unregister(const char *name)
Unregisters a file format.
Definition: file.c:162

References ast_format_def_unregister(), ast_log, ast_format_def::desc_size, f_def, LOG_WARNING, and name.

Referenced by load_module().

Variable Documentation

◆ __mod_info

struct ast_module_info __mod_info = { .name = AST_MODULE, .flags = AST_MODFLAG_LOAD_ORDER , .description = "Raw G.726 (16/24/32/40kbps) data" , .key = "This paragraph is copyright (c) 2006 by Digium, Inc. \In order for your module to load, it must return this \key via a function called \"key\". Any code which \includes this paragraph must be licensed under the GNU \General Public License version 2 or later (at your \option). In addition to Digium's general reservations \of rights, Digium expressly reserves the right to \allow other parties to license this paragraph under \different terms. Any use of Digium, Inc. trademarks or \logos (including \"Asterisk\" or \"Digium\") without \express written permission of Digium, Inc. is prohibited.\n" , .buildopt_sum = AST_BUILDOPT_SUM, .support_level = AST_MODULE_SUPPORT_CORE, .load = load_module, .unload = unload_module, .load_pri = AST_MODPRI_APP_DEPEND }
static

Definition at line 289 of file format_g726.c.

◆ ast_module_info

const struct ast_module_info* ast_module_info = &__mod_info
static

Definition at line 289 of file format_g726.c.

◆ f_def

struct ast_format_def f_def[]
static

Definition at line 202 of file format_g726.c.

Referenced by load_module(), and unload_module().

◆ frame_size

int frame_size[4]
static