codec_ulaw.c - translate between signed linear and ulaw More...

#include "asterisk.h"
#include "asterisk/module.h"
#include "asterisk/config.h"
#include "asterisk/translate.h"
#include "asterisk/ulaw.h"
#include "asterisk/utils.h"
#include "asterisk/slin.h"
#include "ex_ulaw.h"

Include dependency graph for codec_ulaw.c:

Go to the source code of this file.

Defines
#define	BUFFER_SAMPLES 8096 /* size for the translation buffers */
Functions
static void	__reg_module (void)
static void	__unreg_module (void)
static int	lintoulaw_framein (struct ast_trans_pvt pvt, struct ast_frame f)
	convert and store samples in outbuf
static int	load_module (void)
static int	reload (void)
static int	ulawtolin_framein (struct ast_trans_pvt pvt, struct ast_frame f)
	convert and store samples in outbuf
static int	unload_module (void)
Variables
static struct ast_module_info	__mod_info = { .name = AST_MODULE, .flags = AST_MODFLAG_DEFAULT , .description = "mu-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 = AST_BUILDOPT_SUM, .load = load_module, .unload = unload_module, .reload = reload, }
static struct ast_module_info *	ast_module_info = &__mod_info
static struct ast_translator	lintotestlaw
static struct ast_translator	lintoulaw
	The complete translator for LinToulaw.
static struct ast_translator	testlawtolin
static struct ast_translator	ulawtolin
	The complete translator for ulawToLin.

Detailed Description

codec_ulaw.c - translate between signed linear and ulaw

Definition in file codec_ulaw.c.

Define Documentation

#define BUFFER_SAMPLES 8096 /* size for the translation buffers */

Definition at line 40 of file codec_ulaw.c.

Function Documentation

static void __reg_module ( void ) [static]

Definition at line 168 of file codec_ulaw.c.

static void __unreg_module ( void ) [static]

Definition at line 168 of file codec_ulaw.c.

static int lintoulaw_framein	(	struct ast_trans_pvt *	pvt,
		struct ast_frame *	f
	)		`[static]`

convert and store samples in outbuf

Definition at line 64 of file codec_ulaw.c.

References AST_LIN2MU, ast_trans_pvt::c, ast_frame::data, ast_trans_pvt::datalen, ast_trans_pvt::outbuf, ast_frame::ptr, ast_frame::samples, and ast_trans_pvt::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_LIN2MU(*src++);

   return 0;
}

static int load_module ( void ) [static]

Definition at line 136 of file codec_ulaw.c.

References ast_format_set(), AST_FORMAT_SLINEAR, AST_FORMAT_TESTLAW, AST_FORMAT_ULAW, AST_MODULE_LOAD_FAILURE, AST_MODULE_LOAD_SUCCESS, ast_register_translator, ast_unregister_translator(), ast_translator::dst_format, and ast_translator::src_format.

{
   int res;

   ast_format_set(&lintoulaw.src_format, AST_FORMAT_SLINEAR, 0);
   ast_format_set(&lintoulaw.dst_format, AST_FORMAT_ULAW, 0);

   ast_format_set(&lintotestlaw.src_format, AST_FORMAT_SLINEAR, 0);
   ast_format_set(&lintotestlaw.dst_format, AST_FORMAT_TESTLAW, 0);

   ast_format_set(&ulawtolin.src_format, AST_FORMAT_ULAW, 0);
   ast_format_set(&ulawtolin.dst_format, AST_FORMAT_SLINEAR, 0);

   ast_format_set(&testlawtolin.src_format, AST_FORMAT_TESTLAW, 0);
   ast_format_set(&testlawtolin.dst_format, AST_FORMAT_SLINEAR, 0);

   res = ast_register_translator(&ulawtolin);
   if (!res) {
      res = ast_register_translator(&lintoulaw);
      res |= ast_register_translator(&lintotestlaw);
      res |= ast_register_translator(&testlawtolin);
   } else
      ast_unregister_translator(&ulawtolin);
   if (res)
      return AST_MODULE_LOAD_FAILURE;
   return AST_MODULE_LOAD_SUCCESS;
}

static int reload ( void ) [static]

Definition at line 119 of file codec_ulaw.c.

References AST_MODULE_LOAD_SUCCESS.

{
   return AST_MODULE_LOAD_SUCCESS;
}

static int ulawtolin_framein	(	struct ast_trans_pvt *	pvt,
		struct ast_frame *	f
	)		`[static]`

convert and store samples in outbuf

Definition at line 47 of file codec_ulaw.c.

References AST_MULAW, ast_frame::data, ast_trans_pvt::datalen, ast_trans_pvt::i16, ast_trans_pvt::outbuf, ast_frame::ptr, ast_frame::samples, and ast_trans_pvt::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 */

   /* convert and copy in outbuf */
   while (i--)
      *dst++ = AST_MULAW(*src++);

   return 0;
}

static int unload_module ( void ) [static]

Definition at line 124 of file codec_ulaw.c.

References ast_unregister_translator().

{
   int res;

   res = ast_unregister_translator(&lintoulaw);
   res |= ast_unregister_translator(&ulawtolin);
   res |= ast_unregister_translator(&testlawtolin);
   res |= ast_unregister_translator(&lintotestlaw);

   return res;
}

Variable Documentation

struct ast_module_info __mod_info = { .name = AST_MODULE, .flags = AST_MODFLAG_DEFAULT , .description = "mu-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 = AST_BUILDOPT_SUM, .load = load_module, .unload = unload_module, .reload = reload, } [static]

Definition at line 168 of file codec_ulaw.c.

struct ast_module_info* ast_module_info = &__mod_info [static]

Definition at line 168 of file codec_ulaw.c.

struct ast_translator lintotestlaw [static]

Definition at line 111 of file codec_ulaw.c.

struct ast_translator lintoulaw [static]

The complete translator for LinToulaw.

Definition at line 103 of file codec_ulaw.c.

struct ast_translator testlawtolin [static]

Definition at line 91 of file codec_ulaw.c.

struct ast_translator ulawtolin [static]

The complete translator for ulawToLin.