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.

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

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. More...
struct ast_module *	AST_MODULE_SELF_SYM (void)
static int	lintoalaw_framein (struct ast_trans_pvt *pvt, struct ast_frame *f)
	convert and store input samples in output buffer More...
static int	load_module (void)
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 = AST_BUILDOPT_SUM, .support_level = AST_MODULE_SUPPORT_CORE, .load = load_module, .unload = unload_module, }
static struct ast_translator	alawtolin
static const 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.

Macro Definition Documentation

BUFFER_SAMPLES

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

Definition at line 38 of file codec_alaw.c.

Function Documentation

__reg_module()

static void __reg_module ( void  )

static

Definition at line 143 of file codec_alaw.c.

__unreg_module()

static void __unreg_module ( void  )

static

Definition at line 143 of file codec_alaw.c.

alawtolin_framein()

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 45 of file codec_alaw.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 */
 
    while (i--)
        *dst++ = AST_ALAW(*src++);
 
    return 0;
}

References AST_ALAW, 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.

AST_MODULE_SELF_SYM()

struct ast_module * AST_MODULE_SELF_SYM

(

void

)

Definition at line 143 of file codec_alaw.c.

lintoalaw_framein()

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 61 of file codec_alaw.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_LIN2A(*src++);
 
    return 0;
}

References AST_LIN2A, 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 124 of file codec_alaw.c.

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

References alawtolin, AST_MODULE_LOAD_DECLINE, AST_MODULE_LOAD_SUCCESS, ast_register_translator, lintoalaw, and unload_module().

unload_module()

static int unload_module ( void  )

static

Definition at line 114 of file codec_alaw.c.

{
    int res;
 
    res = ast_unregister_translator(&lintoalaw);
    res |= ast_unregister_translator(&alawtolin);
 
    return res;
}

References alawtolin, ast_unregister_translator(), and lintoalaw.

Referenced by load_module().

Variable Documentation

__mod_info

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

static

Definition at line 143 of file codec_alaw.c.

alawtolin

struct ast_translator alawtolin

static

Definition at line 76 of file codec_alaw.c.

Referenced by load_module(), and unload_module().

ast_module_info

const struct ast_module_info* ast_module_info = &__mod_info

static

Definition at line 143 of file codec_alaw.c.

lintoalaw

struct ast_translator lintoalaw

static

Definition at line 95 of file codec_alaw.c.

Referenced by load_module(), and unload_module().