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"

Include dependency graph for codec_a_mu.c:

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


Function Documentation

static void __reg_module ( void   )  [static]

Definition at line 152 of file codec_a_mu.c.

static void __unreg_module ( void   )  [static]

Definition at line 152 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 50 of file codec_a_mu.c.

References ast_frame::data, ast_trans_pvt::datalen, ast_trans_pvt::outbuf, ast_frame::ptr, ast_trans_pvt::samples, ast_frame::samples, and ast_trans_pvt::uc.

00051 {
00052    int x = f->samples;
00053    unsigned char *src = f->data.ptr;
00054    unsigned char *dst = pvt->outbuf.uc + pvt->samples;
00055 
00056    pvt->samples += x;
00057    pvt->datalen += x;
00058 
00059    while (x--)
00060       *dst++ = a2mu[*src++];
00061 
00062    return 0;
00063 }

static int load_module ( void   )  [static]

Definition at line 131 of file codec_a_mu.c.

References AST_ALAW, AST_LIN2A, AST_LIN2MU, AST_MODULE_LOAD_FAILURE, AST_MODULE_LOAD_SUCCESS, AST_MULAW, ast_register_translator, and unload_module.

00132 {
00133    int res;
00134    int x;
00135 
00136    for (x=0;x<256;x++) {
00137       mu2a[x] = AST_LIN2A(AST_MULAW(x));
00138       a2mu[x] = AST_LIN2MU(AST_ALAW(x));
00139    }
00140 
00141    res = ast_register_translator(&alawtoulaw);
00142    res |= ast_register_translator(&ulawtoalaw);
00143 
00144    if (res) {
00145       unload_module();
00146       return AST_MODULE_LOAD_FAILURE;
00147    }
00148 
00149    return AST_MODULE_LOAD_SUCCESS;
00150 }

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 66 of file codec_a_mu.c.

References ast_frame::data, ast_trans_pvt::datalen, ast_trans_pvt::outbuf, ast_frame::ptr, ast_trans_pvt::samples, ast_frame::samples, and ast_trans_pvt::uc.

00067 {
00068    int x = f->samples;
00069    unsigned char *src = f->data.ptr;
00070    unsigned char *dst = pvt->outbuf.uc + pvt->samples;
00071 
00072    pvt->samples += x;
00073    pvt->datalen += x;
00074 
00075    while (x--)
00076       *dst++ = mu2a[*src++];
00077 
00078    return 0;
00079 }

static int unload_module ( void   )  [static]

standard module glue

Definition at line 121 of file codec_a_mu.c.

References ast_unregister_translator().

00122 {
00123    int res;
00124 
00125    res = ast_unregister_translator(&ulawtoalaw);
00126    res |= ast_unregister_translator(&alawtoulaw);
00127 
00128    return res;
00129 }


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 = AST_BUILDOPT_SUM, .load = load_module, .unload = unload_module, .load_pri = AST_MODPRI_DEFAULT, .support_level = AST_MODULE_SUPPORT_CORE, } [static]

Definition at line 152 of file codec_a_mu.c.

unsigned char a2mu[256] [static]

Definition at line 43 of file codec_a_mu.c.

struct ast_translator alawtoulaw [static]

Definition at line 81 of file codec_a_mu.c.

Definition at line 152 of file codec_a_mu.c.

unsigned char mu2a[256] [static]

Definition at line 42 of file codec_a_mu.c.

struct ast_translator ulawtoalaw [static]

Definition at line 100 of file codec_a_mu.c.


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