Asterisk - The Open Source Telephony Project GIT-master-2de1a68
Macros | Functions | Variables
format_g729.c File Reference

Save to raw, headerless G729 data. 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_g729.c:

Go to the source code of this file.

Macros

#define BUF_SIZE   20 /* two G729 frames */
 
#define G729A_SAMPLES   160
 

Functions

static void __reg_module (void)
 
static void __unreg_module (void)
 
struct ast_moduleAST_MODULE_SELF_SYM (void)
 
static struct ast_frameg729_read (struct ast_filestream *s, int *whennext)
 
static int g729_seek (struct ast_filestream *fs, off_t sample_offset, int whence)
 
static off_t g729_tell (struct ast_filestream *fs)
 
static int g729_trunc (struct ast_filestream *fs)
 
static int g729_write (struct ast_filestream *fs, 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.729 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 g729_f
 

Detailed Description

Save to raw, headerless G729 data.

Note
This is not an encoder/decoder. The codec for g729 is only available with a commercial license from Digium, due to patent restrictions. Check http://www.digium.com for information.
  • Extensions: g729

Definition in file format_g729.c.

Macro Definition Documentation

◆ BUF_SIZE

#define BUF_SIZE   20 /* two G729 frames */

Definition at line 44 of file format_g729.c.

◆ G729A_SAMPLES

#define G729A_SAMPLES   160

Definition at line 45 of file format_g729.c.

Function Documentation

◆ __reg_module()

static void __reg_module ( void  )
static

Definition at line 159 of file format_g729.c.

◆ __unreg_module()

static void __unreg_module ( void  )
static

Definition at line 159 of file format_g729.c.

◆ AST_MODULE_SELF_SYM()

struct ast_module * AST_MODULE_SELF_SYM ( void  )

Definition at line 159 of file format_g729.c.

◆ g729_read()

static struct ast_frame * g729_read ( struct ast_filestream s,
int *  whennext 
)
static

Definition at line 47 of file format_g729.c.

48{
49 size_t res;
50
51 /* Send a frame from the file to the appropriate channel */
54 if ((res = fread(s->fr.data.ptr, 1, s->fr.datalen, s->f)) != s->fr.datalen) {
55 if (res && res != 10) /* XXX what for ? */ {
56 ast_log(LOG_WARNING, "Short read of %s data (expected %d bytes, read %zu): %s\n",
58 strerror(errno));
59 }
60 return NULL;
61 }
62 *whennext = s->fr.samples;
63 return &s->fr;
64}
#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 BUF_SIZE
Definition: format_g729.c:44
#define G729A_SAMPLES
Definition: format_g729.c:45
#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
struct ast_format * format
struct ast_frame_subclass subclass
union ast_frame::@226 data

References ast_format_get_name(), AST_FRAME_SET_BUFFER, AST_FRIENDLY_OFFSET, ast_log, ast_filestream::buf, BUF_SIZE, ast_frame::data, ast_frame::datalen, errno, ast_filestream::f, ast_frame_subclass::format, ast_filestream::fr, G729A_SAMPLES, LOG_WARNING, NULL, ast_frame::ptr, ast_frame::samples, and ast_frame::subclass.

◆ g729_seek()

static int g729_seek ( struct ast_filestream fs,
off_t  sample_offset,
int  whence 
)
static

Definition at line 81 of file format_g729.c.

82{
83 long bytes;
84 off_t min,cur,max,offset=0;
85 min = 0;
86 cur = ftello(fs->f);
87 fseeko(fs->f, 0, SEEK_END);
88 max = ftello(fs->f);
89
90 bytes = BUF_SIZE * (sample_offset / G729A_SAMPLES);
91 if (whence == SEEK_SET)
92 offset = bytes;
93 else if (whence == SEEK_CUR || whence == SEEK_FORCECUR)
94 offset = cur + bytes;
95 else if (whence == SEEK_END)
96 offset = max - bytes;
97 if (whence != SEEK_FORCECUR) {
98 offset = (offset > max)?max:offset;
99 }
100 /* protect against seeking beyond begining. */
101 offset = (offset < min)?min:offset;
102 if (fseeko(fs->f, offset, SEEK_SET) < 0)
103 return -1;
104 return 0;
105}
#define min(a, b)
Definition: f2c.h:197
#define max(a, b)
Definition: f2c.h:198
#define SEEK_FORCECUR
Definition: file.h:51

References BUF_SIZE, ast_filestream::f, G729A_SAMPLES, max, min, ast_frame::offset, and SEEK_FORCECUR.

◆ g729_tell()

static off_t g729_tell ( struct ast_filestream fs)
static

Definition at line 124 of file format_g729.c.

125{
126 off_t offset = ftello(fs->f);
127 return (offset/BUF_SIZE)*G729A_SAMPLES;
128}

References BUF_SIZE, ast_filestream::f, G729A_SAMPLES, and ast_frame::offset.

◆ g729_trunc()

static int g729_trunc ( struct ast_filestream fs)
static

Definition at line 107 of file format_g729.c.

108{
109 int fd;
110 off_t cur;
111
112 if ((fd = fileno(fs->f)) < 0) {
113 ast_log(AST_LOG_WARNING, "Unable to determine file descriptor for g729 filestream %p: %s\n", fs, strerror(errno));
114 return -1;
115 }
116 if ((cur = ftello(fs->f)) < 0) {
117 ast_log(AST_LOG_WARNING, "Unable to determine current position in g729 filestream %p: %s\n", fs, strerror(errno));
118 return -1;
119 }
120 /* Truncate file to current length */
121 return ftruncate(fd, cur);
122}
#define AST_LOG_WARNING

References ast_log, AST_LOG_WARNING, errno, and ast_filestream::f.

◆ g729_write()

static int g729_write ( struct ast_filestream fs,
struct ast_frame f 
)
static

Definition at line 66 of file format_g729.c.

67{
68 int res;
69
70 if (f->datalen % 10) {
71 ast_log(LOG_WARNING, "Invalid data length, %d, should be multiple of 10\n", f->datalen);
72 return -1;
73 }
74 if ((res = fwrite(f->data.ptr, 1, f->datalen, fs->f)) != f->datalen) {
75 ast_log(LOG_WARNING, "Bad write (%d/10): %s\n", res, strerror(errno));
76 return -1;
77 }
78 return 0;
79}

References ast_log, ast_frame::data, ast_frame::datalen, errno, ast_filestream::f, LOG_WARNING, and ast_frame::ptr.

◆ load_module()

static int load_module ( void  )
static

Definition at line 141 of file format_g729.c.

142{
147}
struct ast_format * ast_format_g729
Built-in cached g729 format.
Definition: format_cache.c:151
static struct ast_format_def g729_f
Definition: format_g729.c:130
#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_g729, AST_MODULE_LOAD_DECLINE, AST_MODULE_LOAD_SUCCESS, ast_format_def::format, and g729_f.

◆ unload_module()

static int unload_module ( void  )
static

Definition at line 149 of file format_g729.c.

150{
152}
int ast_format_def_unregister(const char *name)
Unregisters a file format.
Definition: file.c:162
char name[80]
Definition: mod_format.h:44

References ast_format_def_unregister(), g729_f, and ast_format_def::name.

Variable Documentation

◆ __mod_info

struct ast_module_info __mod_info = { .name = AST_MODULE, .flags = AST_MODFLAG_LOAD_ORDER , .description = "Raw G.729 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 159 of file format_g729.c.

◆ ast_module_info

const struct ast_module_info* ast_module_info = &__mod_info
static

Definition at line 159 of file format_g729.c.

◆ g729_f

struct ast_format_def g729_f
static

Definition at line 130 of file format_g729.c.

Referenced by load_module(), and unload_module().