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_module *	AST_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_info *	ast_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.

{
   int x = f->samples;
   unsigned char *src = f->data.ptr;
   unsigned char *dst = pvt->outbuf.uc + pvt->samples;

   pvt->samples += x;
   pvt->datalen += x;

   while (x--)
      *dst++ = a2mu[*src++];

   return 0;
}

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().

{
   int res;
   int x;

   for (x=0;x<256;x++) {
      mu2a[x] = AST_LIN2A(AST_MULAW(x));
      a2mu[x] = AST_LIN2MU(AST_ALAW(x));
   }

   res = ast_register_translator(&alawtoulaw);
   res |= ast_register_translator(&ulawtoalaw);

   if (res) {
      unload_module();
      return AST_MODULE_LOAD_DECLINE;
   }

   return AST_MODULE_LOAD_SUCCESS;
}

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.

{
   int x = f->samples;
   unsigned char *src = f->data.ptr;
   unsigned char *dst = pvt->outbuf.uc + pvt->samples;

   pvt->samples += x;
   pvt->datalen += x;

   while (x--)
      *dst++ = mu2a[*src++];

   return 0;
}

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().

{
   int res;

   res = ast_unregister_translator(&ulawtoalaw);
   res |= ast_unregister_translator(&alawtoulaw);

   return res;
}

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.