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	parse_config (int reload)
static int	reload (void)
	standard module stuff
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 = "0901e4e500243c855563a2d78b0c03e4" , .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 151 of file codec_alaw.c.

static void __unreg_module ( void ) [static]

Definition at line 151 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 131 of file codec_alaw.c.

References ast_register_translator, ast_unregister_translator(), and parse_config().

{
   int res;

   if (parse_config(0))
      return AST_MODULE_LOAD_DECLINE;
   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 parse_config ( int reload ) [static]

Definition at line 95 of file codec_alaw.c.

References ast_config_destroy(), ast_config_load, ast_true(), ast_variable_browse(), ast_verb, CONFIG_FLAG_FILEUNCHANGED, CONFIG_STATUS_FILEINVALID, CONFIG_STATUS_FILEMISSING, CONFIG_STATUS_FILEUNCHANGED, ast_variable::name, ast_variable::next, ast_translator::useplc, and ast_variable::value.

Referenced by load_module(), and reload().

{
   struct ast_variable *var;
   struct ast_flags config_flags = { reload ? CONFIG_FLAG_FILEUNCHANGED : 0 };
   struct ast_config *cfg = ast_config_load("codecs.conf", config_flags);
   if (cfg == CONFIG_STATUS_FILEMISSING || cfg == CONFIG_STATUS_FILEUNCHANGED || cfg == CONFIG_STATUS_FILEINVALID)
      return 0;
   for (var = ast_variable_browse(cfg, "plc"); var; var = var->next) {
      if (!strcasecmp(var->name, "genericplc")) {
         alawtolin.useplc = ast_true(var->value) ? 1 : 0;
         ast_verb(3, "codec_alaw: %susing generic PLC\n", alawtolin.useplc ? "" : "not ");
      }
   }
   ast_config_destroy(cfg);
   return 0;
}

static int reload ( void ) [static]

standard module stuff

Definition at line 114 of file codec_alaw.c.

References parse_config().

{
   if (parse_config(1))
      return AST_MODULE_LOAD_DECLINE;
   return AST_MODULE_LOAD_SUCCESS;
}

static int unload_module ( void ) [static]

Definition at line 121 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 __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 = "0901e4e500243c855563a2d78b0c03e4" , .load = load_module, .unload = unload_module, .reload = reload, } [static]

Definition at line 151 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 151 of file codec_alaw.c.

struct ast_translator lintoalaw [static]

Definition at line 85 of file codec_alaw.c.

Asterisk developer's documentation

codec_alaw.c File Reference

Defines

Functions

Variables

Detailed Description

Define Documentation

Function Documentation

Variable Documentation