Asterisk - The Open Source Telephony Project  18.5.0
Macros | Functions | Variables
codec_a_mu.c File Reference

codec_a_mu.c - translate between alaw and ulaw directly More...

#include "asterisk.h"
#include "asterisk/module.h"
#include "asterisk/translate.h"
#include "asterisk/alaw.h"
#include "asterisk/ulaw.h"
#include "asterisk/utils.h"
#include "ex_ulaw.h"
#include "ex_alaw.h"
Include dependency graph for codec_a_mu.c:

Go to the source code of this file.

Macros

#define BUFFER_SAMPLES   8000 /* size for the translation buffers */
 

Functions

static void __reg_module (void)
 
static void __unreg_module (void)
 
static int alawtoulaw_framein (struct ast_trans_pvt *pvt, struct ast_frame *f)
 convert frame data and store into the buffer More...
 
struct ast_moduleAST_MODULE_SELF_SYM (void)
 
static int load_module (void)
 
static int ulawtoalaw_framein (struct ast_trans_pvt *pvt, struct ast_frame *f)
 convert frame data and store into the buffer More...
 
static int unload_module (void)
 standard module glue More...
 

Variables

static struct ast_module_info __mod_info = { .name = AST_MODULE, .flags = AST_MODFLAG_LOAD_ORDER , .description = "A-law and Mulaw direct 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 = "30ef0c93b36035ec78c9cfd712d36d9b" , .load = load_module, .unload = unload_module, .load_pri = AST_MODPRI_DEFAULT, .support_level = AST_MODULE_SUPPORT_CORE, }
 
static unsigned char a2mu [256]
 
static struct ast_translator alawtoulaw
 
static const struct ast_module_infoast_module_info = &__mod_info
 
static unsigned char mu2a [256]
 
static struct ast_translator ulawtoalaw
 

Detailed Description

codec_a_mu.c - translate between alaw and ulaw directly

Definition in file codec_a_mu.c.

Macro Definition Documentation

◆ BUFFER_SAMPLES

#define BUFFER_SAMPLES   8000 /* size for the translation buffers */

Definition at line 38 of file codec_a_mu.c.

Function Documentation

◆ __reg_module()

static void __reg_module ( void  )
static

Definition at line 150 of file codec_a_mu.c.

◆ __unreg_module()

static void __unreg_module ( void  )
static

Definition at line 150 of file codec_a_mu.c.

◆ alawtoulaw_framein()

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

convert frame data and store into the buffer

Definition at line 48 of file codec_a_mu.c.

References a2mu, ast_frame::data, ast_trans_pvt::datalen, ast_trans_pvt::outbuf, ast_frame::ptr, ast_frame::samples, ast_trans_pvt::samples, and ast_trans_pvt::uc.

49 {
50  int x = f->samples;
51  unsigned char *src = f->data.ptr;
52  unsigned char *dst = pvt->outbuf.uc + pvt->samples;
53 
54  pvt->samples += x;
55  pvt->datalen += x;
56 
57  while (x--)
58  *dst++ = a2mu[*src++];
59 
60  return 0;
61 }
int datalen
actual space used in outbuf
Definition: translate.h:218
unsigned char * uc
Definition: translate.h:222
union ast_trans_pvt::@327 outbuf
static unsigned char a2mu[256]
Definition: codec_a_mu.c:41
union ast_frame::@263 data

◆ AST_MODULE_SELF_SYM()

struct ast_module* AST_MODULE_SELF_SYM ( void  )

Definition at line 150 of file codec_a_mu.c.

◆ load_module()

static int load_module ( void  )
static

Definition at line 129 of file codec_a_mu.c.

References a2mu, AST_ALAW, AST_LIN2A, AST_LIN2MU, AST_MODULE_LOAD_DECLINE, AST_MODULE_LOAD_SUCCESS, AST_MULAW, ast_register_translator, mu2a, and unload_module().

130 {
131  int res;
132  int x;
133 
134  for (x=0;x<256;x++) {
135  mu2a[x] = AST_LIN2A(AST_MULAW(x));
136  a2mu[x] = AST_LIN2MU(AST_ALAW(x));
137  }
138 
141 
142  if (res) {
143  unload_module();
145  }
146 
148 }
#define AST_ALAW(a)
Definition: alaw.h:84
static int unload_module(void)
standard module glue
Definition: codec_a_mu.c:119
#define AST_MULAW(a)
Definition: ulaw.h:85
#define ast_register_translator(t)
See __ast_register_translator()
Definition: translate.h:257
static struct ast_translator alawtoulaw
Definition: codec_a_mu.c:79
Module has failed to load, may be in an inconsistent state.
Definition: module.h:78
static struct ast_translator ulawtoalaw
Definition: codec_a_mu.c:98
static unsigned char a2mu[256]
Definition: codec_a_mu.c:41
static unsigned char mu2a[256]
Definition: codec_a_mu.c:40
#define AST_LIN2MU(a)
Definition: ulaw.h:49
#define AST_LIN2A(a)
Definition: alaw.h:50

◆ ulawtoalaw_framein()

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

convert frame data and store into the buffer

Definition at line 64 of file codec_a_mu.c.

References ast_frame::data, ast_trans_pvt::datalen, mu2a, ast_trans_pvt::outbuf, ast_frame::ptr, ast_frame::samples, ast_trans_pvt::samples, and ast_trans_pvt::uc.

65 {
66  int x = f->samples;
67  unsigned char *src = f->data.ptr;
68  unsigned char *dst = pvt->outbuf.uc + pvt->samples;
69 
70  pvt->samples += x;
71  pvt->datalen += x;
72 
73  while (x--)
74  *dst++ = mu2a[*src++];
75 
76  return 0;
77 }
int datalen
actual space used in outbuf
Definition: translate.h:218
unsigned char * uc
Definition: translate.h:222
union ast_trans_pvt::@327 outbuf
union ast_frame::@263 data
static unsigned char mu2a[256]
Definition: codec_a_mu.c:40

◆ unload_module()

static int unload_module ( void  )
static

standard module glue

Definition at line 119 of file codec_a_mu.c.

References ast_unregister_translator().

Referenced by load_module().

120 {
121  int res;
122 
125 
126  return res;
127 }
int ast_unregister_translator(struct ast_translator *t)
Unregister a translator Unregisters the given tranlator.
Definition: translate.c:1333
static struct ast_translator alawtoulaw
Definition: codec_a_mu.c:79
static struct ast_translator ulawtoalaw
Definition: codec_a_mu.c:98

Variable Documentation

◆ __mod_info

struct ast_module_info __mod_info = { .name = AST_MODULE, .flags = AST_MODFLAG_LOAD_ORDER , .description = "A-law and Mulaw direct 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 = "30ef0c93b36035ec78c9cfd712d36d9b" , .load = load_module, .unload = unload_module, .load_pri = AST_MODPRI_DEFAULT, .support_level = AST_MODULE_SUPPORT_CORE, }
static

Definition at line 150 of file codec_a_mu.c.

◆ a2mu

unsigned char a2mu[256]
static

Definition at line 41 of file codec_a_mu.c.

Referenced by alawtoulaw_framein(), and load_module().

◆ alawtoulaw

struct ast_translator alawtoulaw
static

Definition at line 79 of file codec_a_mu.c.

◆ ast_module_info

const struct ast_module_info* ast_module_info = &__mod_info
static

Definition at line 150 of file codec_a_mu.c.

◆ mu2a

unsigned char mu2a[256]
static

Definition at line 40 of file codec_a_mu.c.

Referenced by load_module(), and ulawtoalaw_framein().

◆ ulawtoalaw

struct ast_translator ulawtoalaw
static

Definition at line 98 of file codec_a_mu.c.