Mon Jun 27 16:51:12 2011

Asterisk developer's documentation


codec_a_mu.c File Reference

codec_a_mu.c - translate between alaw and ulaw directly More...

#include "asterisk.h"
#include "asterisk/module.h"
#include "asterisk/translate.h"
#include "asterisk/alaw.h"
#include "asterisk/ulaw.h"
#include "asterisk/utils.h"
#include "ex_ulaw.h"
#include "ex_alaw.h"

Go to the source code of this file.

Defines

#define BUFFER_SAMPLES   8000

Functions

static void __reg_module (void)
static void __unreg_module (void)
static int alawtoulaw_framein (struct ast_trans_pvt *pvt, struct ast_frame *f)
 convert frame data and store into the buffer
static int load_module (void)
static int ulawtoalaw_framein (struct ast_trans_pvt *pvt, struct ast_frame *f)
 convert frame data and store into the buffer
static int unload_module (void)
 standard module glue

Variables

static struct ast_module_info __mod_info = { .name = AST_MODULE, .flags = AST_MODFLAG_LOAD_ORDER , .description = "A-law and Mulaw direct 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, .load_pri = AST_MODPRI_DEFAULT, }
static unsigned char a2mu [256]
static struct ast_translator alawtoulaw
static struct ast_module_infoast_module_info = &__mod_info
static unsigned char mu2a [256]
static struct ast_translator ulawtoalaw


Detailed Description

codec_a_mu.c - translate between alaw and ulaw directly

Definition in file codec_a_mu.c.


Define Documentation

#define BUFFER_SAMPLES   8000

Definition at line 36 of file codec_a_mu.c.

Referenced by gsmtolin_framein(), ilbctolin_framein(), lintogsm_framein(), lintolpc10_framein(), lpc10tolin_framein(), and speextolin_framein().


Function Documentation

static void __reg_module ( void   )  [static]

Definition at line 128 of file codec_a_mu.c.

static void __unreg_module ( void   )  [static]

Definition at line 128 of file codec_a_mu.c.

static int alawtoulaw_framein ( struct ast_trans_pvt pvt,
struct ast_frame f 
) [static]

convert frame data and store into the buffer

Definition at line 46 of file codec_a_mu.c.

References ast_trans_pvt::datalen, f, ast_trans_pvt::outbuf, ast_trans_pvt::samples, and ast_trans_pvt::uc.

00047 {
00048    int x = f->samples;
00049    unsigned char *src = f->data.ptr;
00050    unsigned char *dst = pvt->outbuf.uc + pvt->samples;
00051 
00052    pvt->samples += x;
00053    pvt->datalen += x;
00054 
00055    while (x--)
00056       *dst++ = a2mu[*src++];
00057 
00058    return 0;
00059 }

static int load_module ( void   )  [static]

Definition at line 109 of file codec_a_mu.c.

References alawtoulaw, AST_ALAW, AST_LIN2A, AST_LIN2MU, AST_MODULE_LOAD_FAILURE, AST_MODULE_LOAD_SUCCESS, AST_MULAW, ast_register_translator, ast_unregister_translator(), and ulawtoalaw.

00110 {
00111    int res;
00112    int x;
00113 
00114    for (x=0;x<256;x++) {
00115       mu2a[x] = AST_LIN2A(AST_MULAW(x));
00116       a2mu[x] = AST_LIN2MU(AST_ALAW(x));
00117    }
00118    res = ast_register_translator(&alawtoulaw);
00119    if (!res)
00120       res = ast_register_translator(&ulawtoalaw);
00121    else
00122       ast_unregister_translator(&alawtoulaw);
00123    if (res)
00124       return AST_MODULE_LOAD_FAILURE;
00125    return AST_MODULE_LOAD_SUCCESS;
00126 }

static int ulawtoalaw_framein ( struct ast_trans_pvt pvt,
struct ast_frame f 
) [static]

convert frame data and store into the buffer

Definition at line 62 of file codec_a_mu.c.

References ast_trans_pvt::datalen, f, ast_trans_pvt::outbuf, ast_trans_pvt::samples, and ast_trans_pvt::uc.

00063 {
00064    int x = f->samples;
00065    unsigned char *src = f->data.ptr;
00066    unsigned char *dst = pvt->outbuf.uc + pvt->samples;
00067 
00068    pvt->samples += x;
00069    pvt->datalen += x;
00070 
00071    while (x--)
00072       *dst++ = mu2a[*src++];
00073 
00074    return 0;
00075 }

static int unload_module ( void   )  [static]

standard module glue

Definition at line 99 of file codec_a_mu.c.

References alawtoulaw, ast_unregister_translator(), and ulawtoalaw.

00100 {
00101    int res;
00102 
00103    res = ast_unregister_translator(&ulawtoalaw);
00104    res |= ast_unregister_translator(&alawtoulaw);
00105 
00106    return res;
00107 }


Variable Documentation

struct ast_module_info __mod_info = { .name = AST_MODULE, .flags = AST_MODFLAG_LOAD_ORDER , .description = "A-law and Mulaw direct 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, .load_pri = AST_MODPRI_DEFAULT, } [static]

Definition at line 128 of file codec_a_mu.c.

unsigned char a2mu[256] [static]

Definition at line 39 of file codec_a_mu.c.

struct ast_translator alawtoulaw [static]

Definition at line 77 of file codec_a_mu.c.

Referenced by load_module(), and unload_module().

struct ast_module_info* ast_module_info = &__mod_info [static]

Definition at line 128 of file codec_a_mu.c.

unsigned char mu2a[256] [static]

Definition at line 38 of file codec_a_mu.c.

struct ast_translator ulawtoalaw [static]

Definition at line 87 of file codec_a_mu.c.

Referenced by load_module(), and unload_module().


Generated on Mon Jun 27 16:51:12 2011 for Asterisk - The Open Source Telephony Project by  doxygen 1.4.7