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.

Defines
#define	BUFFER_SAMPLES   8096
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.
static int	lintoalaw_framein (struct ast_trans_pvt *pvt, struct ast_frame *f)
	convert and store input samples in output buffer
static int	load_module (void)
static int	reload (void)
	standard module stuff
static int	unload_module (void)
Variables
static struct ast_module_info __MODULE_INFO_SECTION	__mod_info = { __MODULE_INFO_GLOBALS .name = AST_MODULE, .flags = AST_MODFLAG_DEFAULT , .description = "A-law Coder/Decoder" , .key = ASTERISK_GPL_KEY , .buildopt_sum = AST_BUILDOPT_SUM, .load = load_module, .unload = unload_module, .reload = reload, }
static struct ast_translator	alawtolin
static struct ast_module_info *	ast_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.

---

Define Documentation

#define BUFFER_SAMPLES   8096

Definition at line 36 of file codec_alaw.c.

---

Function Documentation

static void __reg_module

(

void

)

[static]

Definition at line 129 of file codec_alaw.c.

static void __unreg_module

(

void

)

[static]

Definition at line 129 of file codec_alaw.c.

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 43 of file codec_alaw.c.

References AST_ALAW, 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.

{
   int i = f->samples;
   unsigned char *src = f->data.ptr;
   int16_t *dst = pvt->outbuf.i16 + pvt->samples;

   pvt->samples += i;
   pvt->datalen += i * 2;  /* 2 bytes/sample */
   
   while (i--)
      *dst++ = AST_ALAW(*src++);

   return 0;
}

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 59 of file codec_alaw.c.

References AST_LIN2A, 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.

{
   int i = f->samples;
   char *dst = pvt->outbuf.c + pvt->samples;
   int16_t *src = f->data.ptr;

   pvt->samples += i;
   pvt->datalen += i;   /* 1 byte/sample */

   while (i--) 
      *dst++ = AST_LIN2A(*src++);

   return 0;
}

static int load_module

(

void

)

[static]

Definition at line 111 of file codec_alaw.c.

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

{
   int res;

   res = ast_register_translator(&alawtolin);
   if (!res)
      res = ast_register_translator(&lintoalaw);
   else
      ast_unregister_translator(&alawtolin);
   if (res)
      return AST_MODULE_LOAD_FAILURE;
   return AST_MODULE_LOAD_SUCCESS;
}

static int reload

(

void

)

[static]

standard module stuff

Definition at line 96 of file codec_alaw.c.

References AST_MODULE_LOAD_SUCCESS.

{
   return AST_MODULE_LOAD_SUCCESS;
}

static int unload_module

(

void

)

[static]

Definition at line 101 of file codec_alaw.c.

References ast_unregister_translator().

{
   int res;

   res = ast_unregister_translator(&lintoalaw);
   res |= ast_unregister_translator(&alawtolin);

   return res;
}

---

Variable Documentation

struct ast_module_info __MODULE_INFO_SECTION __mod_info = { __MODULE_INFO_GLOBALS .name = AST_MODULE, .flags = AST_MODFLAG_DEFAULT , .description = "A-law Coder/Decoder" , .key = ASTERISK_GPL_KEY , .buildopt_sum = AST_BUILDOPT_SUM, .load = load_module, .unload = unload_module, .reload = reload, } [static]

Definition at line 129 of file codec_alaw.c.

struct ast_translator alawtolin [static]

Definition at line 74 of file codec_alaw.c.

struct ast_module_info* ast_module_info = &__mod_info [static]

Definition at line 129 of file codec_alaw.c.

struct ast_translator lintoalaw [static]

Definition at line 84 of file codec_alaw.c.