codec_ulaw.c File Reference

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.

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

Functions
static void	__reg_module (void)
static void	__unreg_module (void)
struct ast_module *	AST_MODULE_SELF_SYM (void)
static int	lintoulaw_framein (struct ast_trans_pvt *pvt, struct ast_frame *f)
	convert and store samples in outbuf More...
static int	load_module (void)
static int	ulawtolin_framein (struct ast_trans_pvt *pvt, struct ast_frame *f)
	convert and store samples in outbuf More...
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, .support_level = AST_MODULE_SUPPORT_CORE, .load = load_module, .unload = unload_module, }
static const struct ast_module_info *	ast_module_info = &__mod_info
static struct ast_translator	lintoulaw
	The complete translator for LinToulaw. More...
static struct ast_translator	ulawtolin
	The complete translator for ulawToLin. More...

Detailed Description

codec_ulaw.c - translate between signed linear and ulaw

Definition in file codec_ulaw.c.

Macro Definition Documentation

BUFFER_SAMPLES

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

Definition at line 38 of file codec_ulaw.c.

Function Documentation

__reg_module()

static void __reg_module ( void  )

static

Definition at line 152 of file codec_ulaw.c.

__unreg_module()

static void __unreg_module ( void  )

static

Definition at line 152 of file codec_ulaw.c.

AST_MODULE_SELF_SYM()

struct ast_module * AST_MODULE_SELF_SYM

(

void

)

Definition at line 152 of file codec_ulaw.c.

lintoulaw_framein()

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

static

convert and store samples in outbuf

Definition at line 62 of file codec_ulaw.c.

{
    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;
}

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.

load_module()

static int load_module ( void  )

static

Definition at line 133 of file codec_ulaw.c.

{
    int res;
 
    res = ast_register_translator(&ulawtolin);
    res |= ast_register_translator(&lintoulaw);
 
    if (res) {
        unload_module();
        return AST_MODULE_LOAD_DECLINE;
    }
 
    return AST_MODULE_LOAD_SUCCESS;
}

References AST_MODULE_LOAD_DECLINE, AST_MODULE_LOAD_SUCCESS, ast_register_translator, lintoulaw, ulawtolin, and unload_module().

ulawtolin_framein()

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

static

convert and store samples in outbuf

Definition at line 45 of file codec_ulaw.c.

{
    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;
}

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.

unload_module()

static int unload_module ( void  )

static

Definition at line 123 of file codec_ulaw.c.

{
    int res;
 
    res = ast_unregister_translator(&lintoulaw);
    res |= ast_unregister_translator(&ulawtolin);
 
    return res;
}

References ast_unregister_translator(), lintoulaw, and ulawtolin.

Referenced by load_module().

Variable Documentation

__mod_info

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, .support_level = AST_MODULE_SUPPORT_CORE, .load = load_module, .unload = unload_module, }

static

Definition at line 152 of file codec_ulaw.c.

ast_module_info

const struct ast_module_info* ast_module_info = &__mod_info

static

Definition at line 152 of file codec_ulaw.c.

lintoulaw

struct ast_translator lintoulaw

static

The complete translator for LinToulaw.

Definition at line 104 of file codec_ulaw.c.

Referenced by load_module(), and unload_module().

ulawtolin

struct ast_translator ulawtolin

static

The complete translator for ulawToLin.

Definition at line 81 of file codec_ulaw.c.

Referenced by load_module(), and unload_module().