Wed Jan 8 2020 09:50:10

Asterisk developer's documentation


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"

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...
 
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 = "ac1f6a56484a8820659555499174e588" , .load = load_module, .unload = unload_module, .load_pri = AST_MODPRI_DEFAULT, }
 
static unsigned char a2mu [256]
 
static struct ast_translator alawtoulaw
 
static 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

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

Definition at line 40 of file codec_a_mu.c.

Function Documentation

static void __reg_module ( void  )
static

Definition at line 132 of file codec_a_mu.c.

static void __unreg_module ( void  )
static

Definition at line 132 of file codec_a_mu.c.

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 50 of file codec_a_mu.c.

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

51 {
52  int x = f->samples;
53  unsigned char *src = f->data.ptr;
54  unsigned char *dst = pvt->outbuf.uc + pvt->samples;
55 
56  pvt->samples += x;
57  pvt->datalen += x;
58 
59  while (x--)
60  *dst++ = a2mu[*src++];
61 
62  return 0;
63 }
int datalen
actual space used in outbuf
Definition: translate.h:140
union ast_trans_pvt::@213 outbuf
void * ptr
Definition: frame.h:160
unsigned char * uc
Definition: translate.h:144
static unsigned char a2mu[256]
Definition: codec_a_mu.c:43
union ast_frame::@172 data
int samples
Definition: frame.h:150
static int load_module ( void  )
static

Definition at line 113 of file codec_a_mu.c.

References AST_ALAW, AST_LIN2A, AST_LIN2MU, AST_MODULE_LOAD_FAILURE, AST_MODULE_LOAD_SUCCESS, AST_MULAW, ast_register_translator, and ast_unregister_translator().

114 {
115  int res;
116  int x;
117 
118  for (x=0;x<256;x++) {
119  mu2a[x] = AST_LIN2A(AST_MULAW(x));
120  a2mu[x] = AST_LIN2MU(AST_ALAW(x));
121  }
123  if (!res)
125  else
127  if (res)
130 }
#define AST_ALAW(a)
Definition: alaw.h:84
#define AST_MULAW(a)
Definition: ulaw.h:85
#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 alawtoulaw
Definition: codec_a_mu.c:81
static struct ast_translator ulawtoalaw
Definition: codec_a_mu.c:91
static unsigned char a2mu[256]
Definition: codec_a_mu.c:43
static unsigned char mu2a[256]
Definition: codec_a_mu.c:42
#define AST_LIN2MU(a)
Definition: ulaw.h:49
#define AST_LIN2A(a)
Definition: alaw.h:50
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 66 of file codec_a_mu.c.

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

67 {
68  int x = f->samples;
69  unsigned char *src = f->data.ptr;
70  unsigned char *dst = pvt->outbuf.uc + pvt->samples;
71 
72  pvt->samples += x;
73  pvt->datalen += x;
74 
75  while (x--)
76  *dst++ = mu2a[*src++];
77 
78  return 0;
79 }
int datalen
actual space used in outbuf
Definition: translate.h:140
union ast_trans_pvt::@213 outbuf
void * ptr
Definition: frame.h:160
unsigned char * uc
Definition: translate.h:144
static unsigned char mu2a[256]
Definition: codec_a_mu.c:42
union ast_frame::@172 data
int samples
Definition: frame.h:150
static int unload_module ( void  )
static

standard module glue

Definition at line 103 of file codec_a_mu.c.

References ast_unregister_translator().

104 {
105  int res;
106 
109 
110  return res;
111 }
int ast_unregister_translator(struct ast_translator *t)
Unregister a translator Unregisters the given tranlator.
Definition: translate.c:942
static struct ast_translator alawtoulaw
Definition: codec_a_mu.c:81
static struct ast_translator ulawtoalaw
Definition: codec_a_mu.c:91

Variable Documentation

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 = "ac1f6a56484a8820659555499174e588" , .load = load_module, .unload = unload_module, .load_pri = AST_MODPRI_DEFAULT, }
static

Definition at line 132 of file codec_a_mu.c.

unsigned char a2mu[256]
static

Definition at line 43 of file codec_a_mu.c.

struct ast_translator alawtoulaw
static

Definition at line 81 of file codec_a_mu.c.

Definition at line 132 of file codec_a_mu.c.

unsigned char mu2a[256]
static

Definition at line 42 of file codec_a_mu.c.

struct ast_translator ulawtoalaw
static

Definition at line 91 of file codec_a_mu.c.