Mon Jun 27 16:51:12 2011

Asterisk developer's documentation


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"

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 __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 = "8586c2a7d357cb591cc3a6607a8f62d1" , .load = load_module, .unload = unload_module, .reload = reload, }
static struct ast_translator alawtolin
static struct ast_module_infoast_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_trans_pvt::datalen, f, ast_trans_pvt::i16, ast_trans_pvt::outbuf, and ast_trans_pvt::samples.

00044 {
00045    int i = f->samples;
00046    unsigned char *src = f->data.ptr;
00047    int16_t *dst = pvt->outbuf.i16 + pvt->samples;
00048 
00049    pvt->samples += i;
00050    pvt->datalen += i * 2;  /* 2 bytes/sample */
00051    
00052    while (i--)
00053       *dst++ = AST_ALAW(*src++);
00054 
00055    return 0;
00056 }

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_trans_pvt::datalen, f, ast_trans_pvt::outbuf, and ast_trans_pvt::samples.

00060 {
00061    int i = f->samples;
00062    char *dst = pvt->outbuf.c + pvt->samples;
00063    int16_t *src = f->data.ptr;
00064 
00065    pvt->samples += i;
00066    pvt->datalen += i;   /* 1 byte/sample */
00067 
00068    while (i--) 
00069       *dst++ = AST_LIN2A(*src++);
00070 
00071    return 0;
00072 }

static int load_module ( void   )  [static]

Definition at line 111 of file codec_alaw.c.

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

00112 {
00113    int res;
00114 
00115    res = ast_register_translator(&alawtolin);
00116    if (!res)
00117       res = ast_register_translator(&lintoalaw);
00118    else
00119       ast_unregister_translator(&alawtolin);
00120    if (res)
00121       return AST_MODULE_LOAD_FAILURE;
00122    return AST_MODULE_LOAD_SUCCESS;
00123 }

static int reload ( void   )  [static]

standard module stuff

Definition at line 96 of file codec_alaw.c.

References AST_MODULE_LOAD_SUCCESS.

00097 {
00098    return AST_MODULE_LOAD_SUCCESS;
00099 }

static int unload_module ( void   )  [static]

Definition at line 101 of file codec_alaw.c.

References alawtolin, ast_unregister_translator(), and lintoalaw.

00102 {
00103    int res;
00104 
00105    res = ast_unregister_translator(&lintoalaw);
00106    res |= ast_unregister_translator(&alawtolin);
00107 
00108    return res;
00109 }


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 = "8586c2a7d357cb591cc3a6607a8f62d1" , .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.

Referenced by load_module(), and unload_module().

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.

Referenced by load_module(), and unload_module().


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