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

codec_alaw.c - translate between signed linear and alaw More...

#include "asterisk.h"
#include "asterisk/module.h"
#include "asterisk/config.h"
#include "asterisk/translate.h"
#include "asterisk/alaw.h"
#include "asterisk/utils.h"
#include "asterisk/slin.h"
#include "ex_alaw.h"
Include dependency graph for codec_alaw.c:

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 alawtolin_framein (struct ast_trans_pvt *pvt, struct ast_frame *f)
 decode frame into lin and fill output buffer. More...
 
struct ast_moduleAST_MODULE_SELF_SYM (void)
 
static int lintoalaw_framein (struct ast_trans_pvt *pvt, struct ast_frame *f)
 convert and store input samples in output buffer More...
 
static int load_module (void)
 
static int unload_module (void)
 

Variables

static struct ast_module_info __mod_info = { .name = AST_MODULE, .flags = AST_MODFLAG_DEFAULT , .description = "A-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 = AST_BUILDOPT_SUM, .support_level = AST_MODULE_SUPPORT_CORE, .load = load_module, .unload = unload_module, }
 
static struct ast_translator alawtolin
 
static const struct ast_module_infoast_module_info = &__mod_info
 
static struct ast_translator lintoalaw
 

Detailed Description

codec_alaw.c - translate between signed linear and alaw

Definition in file codec_alaw.c.

Macro Definition Documentation

◆ BUFFER_SAMPLES

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

Definition at line 38 of file codec_alaw.c.

Function Documentation

◆ __reg_module()

static void __reg_module ( void  )
static

Definition at line 143 of file codec_alaw.c.

◆ __unreg_module()

static void __unreg_module ( void  )
static

Definition at line 143 of file codec_alaw.c.

◆ alawtolin_framein()

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

decode frame into lin and fill output buffer.

Definition at line 45 of file codec_alaw.c.

46{
47 int i = f->samples;
48 unsigned char *src = f->data.ptr;
49 int16_t *dst = pvt->outbuf.i16 + pvt->samples;
50
51 pvt->samples += i;
52 pvt->datalen += i * 2; /* 2 bytes/sample */
53
54 while (i--)
55 *dst++ = AST_ALAW(*src++);
56
57 return 0;
58}
#define AST_ALAW(a)
Definition: alaw.h:84
short int16_t
Definition: db.h:59
union ast_frame::@226 data
int datalen
actual space used in outbuf
Definition: translate.h:218
union ast_trans_pvt::@287 outbuf
int16_t * i16
Definition: translate.h:223

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

◆ AST_MODULE_SELF_SYM()

struct ast_module * AST_MODULE_SELF_SYM ( void  )

Definition at line 143 of file codec_alaw.c.

◆ lintoalaw_framein()

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

convert and store input samples in output buffer

Definition at line 61 of file codec_alaw.c.

62{
63 int i = f->samples;
64 char *dst = pvt->outbuf.c + pvt->samples;
65 int16_t *src = f->data.ptr;
66
67 pvt->samples += i;
68 pvt->datalen += i; /* 1 byte/sample */
69
70 while (i--)
71 *dst++ = AST_LIN2A(*src++);
72
73 return 0;
74}
#define AST_LIN2A(a)
Definition: alaw.h:50

References AST_LIN2A, ast_trans_pvt::c, ast_frame::data, ast_trans_pvt::datalen, ast_trans_pvt::outbuf, ast_frame::ptr, ast_frame::samples, and ast_trans_pvt::samples.

◆ load_module()

static int load_module ( void  )
static

Definition at line 124 of file codec_alaw.c.

125{
126 int res;
127
130
131 if (res) {
134 }
135
137}
static struct ast_translator alawtolin
Definition: codec_alaw.c:76
static struct ast_translator lintoalaw
Definition: codec_alaw.c:95
static int unload_module(void)
Definition: codec_alaw.c:114
@ 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
#define ast_register_translator(t)
See __ast_register_translator()
Definition: translate.h:258

References alawtolin, AST_MODULE_LOAD_DECLINE, AST_MODULE_LOAD_SUCCESS, ast_register_translator, lintoalaw, and unload_module().

◆ unload_module()

static int unload_module ( void  )
static

Definition at line 114 of file codec_alaw.c.

115{
116 int res;
117
120
121 return res;
122}
int ast_unregister_translator(struct ast_translator *t)
Unregister a translator Unregisters the given translator.
Definition: translate.c:1350

References alawtolin, ast_unregister_translator(), and lintoalaw.

Referenced by load_module().

Variable Documentation

◆ __mod_info

struct ast_module_info __mod_info = { .name = AST_MODULE, .flags = AST_MODFLAG_DEFAULT , .description = "A-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 = AST_BUILDOPT_SUM, .support_level = AST_MODULE_SUPPORT_CORE, .load = load_module, .unload = unload_module, }
static

Definition at line 143 of file codec_alaw.c.

◆ alawtolin

struct ast_translator alawtolin
static

Definition at line 76 of file codec_alaw.c.

Referenced by load_module(), and unload_module().

◆ ast_module_info

const struct ast_module_info* ast_module_info = &__mod_info
static

Definition at line 143 of file codec_alaw.c.

◆ lintoalaw

struct ast_translator lintoalaw
static

Definition at line 95 of file codec_alaw.c.

Referenced by load_module(), and unload_module().