Wed Jan 8 2020 09:50:10

Asterisk developer's documentation


codec_ulaw.c File Reference

codec_ulaw.c - translate between signed linear and ulaw More...

#include "asterisk.h"
#include "asterisk/module.h"
#include "asterisk/config.h"
#include "asterisk/translate.h"
#include "asterisk/ulaw.h"
#include "asterisk/utils.h"
#include "asterisk/slin.h"
#include "ex_ulaw.h"

Go to the source code of this file.

Macros

#define BUFFER_SAMPLES   8096 /* size for the translation buffers */
 

Functions

static void __reg_module (void)
 
static void __unreg_module (void)
 
static int lintoulaw_framein (struct ast_trans_pvt *pvt, struct ast_frame *f)
 convert and store samples in outbuf More...
 
static int load_module (void)
 
static int reload (void)
 
static int ulawtolin_framein (struct ast_trans_pvt *pvt, struct ast_frame *f)
 convert and store samples in outbuf More...
 
static int unload_module (void)
 

Variables

static struct ast_module_info __mod_info = { .name = AST_MODULE, .flags = AST_MODFLAG_DEFAULT , .description = "mu-Law Coder/Decoder" , .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 = "ac1f6a56484a8820659555499174e588" , .load = load_module, .unload = unload_module, .reload = reload, }
 
static struct ast_module_infoast_module_info = &__mod_info
 
static struct ast_translator lintotestlaw
 
static struct ast_translator lintoulaw
 The complete translator for LinToulaw. More...
 
static struct ast_translator testlawtolin
 
static struct ast_translator ulawtolin
 The complete translator for ulawToLin. More...
 

Detailed Description

codec_ulaw.c - translate between signed linear and ulaw

Definition in file codec_ulaw.c.

Macro Definition Documentation

#define BUFFER_SAMPLES   8096 /* size for the translation buffers */

Definition at line 40 of file codec_ulaw.c.

Function Documentation

static void __reg_module ( void  )
static

Definition at line 164 of file codec_ulaw.c.

static void __unreg_module ( void  )
static

Definition at line 164 of file codec_ulaw.c.

static int lintoulaw_framein ( struct ast_trans_pvt pvt,
struct ast_frame f 
)
static

convert and store samples in outbuf

Definition at line 64 of file codec_ulaw.c.

References AST_LIN2MU, ast_trans_pvt::c, ast_frame::data, ast_trans_pvt::datalen, ast_trans_pvt::outbuf, ast_frame::ptr, ast_trans_pvt::samples, and ast_frame::samples.

65 {
66  int i = f->samples;
67  char *dst = pvt->outbuf.c + pvt->samples;
68  int16_t *src = f->data.ptr;
69 
70  pvt->samples += i;
71  pvt->datalen += i; /* 1 byte/sample */
72 
73  while (i--)
74  *dst++ = AST_LIN2MU(*src++);
75 
76  return 0;
77 }
int datalen
actual space used in outbuf
Definition: translate.h:140
union ast_trans_pvt::@213 outbuf
void * ptr
Definition: frame.h:160
union ast_frame::@172 data
#define AST_LIN2MU(a)
Definition: ulaw.h:49
int samples
Definition: frame.h:150
static int load_module ( void  )
static

Definition at line 144 of file codec_ulaw.c.

References AST_MODULE_LOAD_FAILURE, AST_MODULE_LOAD_SUCCESS, ast_register_translator, and ast_unregister_translator().

145 {
146  int res;
147 
149  if (!res) {
153  } else
155  if (res)
158 }
static struct ast_translator ulawtolin
The complete translator for ulawToLin.
Definition: codec_ulaw.c:83
static struct ast_translator testlawtolin
Definition: codec_ulaw.c:93
static struct ast_translator lintotestlaw
Definition: codec_ulaw.c:117
#define ast_register_translator(t)
See __ast_register_translator()
Definition: translate.h:170
int ast_unregister_translator(struct ast_translator *t)
Unregister a translator Unregisters the given tranlator.
Definition: translate.c:942
static struct ast_translator lintoulaw
The complete translator for LinToulaw.
Definition: codec_ulaw.c:107
static int reload ( void  )
static

Definition at line 127 of file codec_ulaw.c.

References AST_MODULE_LOAD_SUCCESS.

128 {
130 }
static int ulawtolin_framein ( struct ast_trans_pvt pvt,
struct ast_frame f 
)
static

convert and store samples in outbuf

Definition at line 47 of file codec_ulaw.c.

References AST_MULAW, ast_frame::data, ast_trans_pvt::datalen, ast_trans_pvt::i16, ast_trans_pvt::outbuf, ast_frame::ptr, ast_trans_pvt::samples, and ast_frame::samples.

48 {
49  int i = f->samples;
50  unsigned char *src = f->data.ptr;
51  int16_t *dst = pvt->outbuf.i16 + pvt->samples;
52 
53  pvt->samples += i;
54  pvt->datalen += i * 2; /* 2 bytes/sample */
55 
56  /* convert and copy in outbuf */
57  while (i--)
58  *dst++ = AST_MULAW(*src++);
59 
60  return 0;
61 }
int datalen
actual space used in outbuf
Definition: translate.h:140
union ast_trans_pvt::@213 outbuf
void * ptr
Definition: frame.h:160
int16_t * i16
Definition: translate.h:145
#define AST_MULAW(a)
Definition: ulaw.h:85
union ast_frame::@172 data
int samples
Definition: frame.h:150
static int unload_module ( void  )
static

Definition at line 132 of file codec_ulaw.c.

References ast_unregister_translator().

133 {
134  int res;
135 
140 
141  return res;
142 }
static struct ast_translator ulawtolin
The complete translator for ulawToLin.
Definition: codec_ulaw.c:83
static struct ast_translator testlawtolin
Definition: codec_ulaw.c:93
static struct ast_translator lintotestlaw
Definition: codec_ulaw.c:117
int ast_unregister_translator(struct ast_translator *t)
Unregister a translator Unregisters the given tranlator.
Definition: translate.c:942
static struct ast_translator lintoulaw
The complete translator for LinToulaw.
Definition: codec_ulaw.c:107

Variable Documentation

struct ast_module_info __mod_info = { .name = AST_MODULE, .flags = AST_MODFLAG_DEFAULT , .description = "mu-Law Coder/Decoder" , .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 = "ac1f6a56484a8820659555499174e588" , .load = load_module, .unload = unload_module, .reload = reload, }
static

Definition at line 164 of file codec_ulaw.c.

Definition at line 164 of file codec_ulaw.c.

struct ast_translator lintotestlaw
static

Definition at line 117 of file codec_ulaw.c.

struct ast_translator lintoulaw
static

The complete translator for LinToulaw.

Definition at line 107 of file codec_ulaw.c.

struct ast_translator testlawtolin
static

Definition at line 93 of file codec_ulaw.c.

struct ast_translator ulawtolin
static

The complete translator for ulawToLin.

Definition at line 83 of file codec_ulaw.c.