Wed Apr 6 11:30:03 2011

Asterisk developer's documentation


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"

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 lintoulaw_framein (struct ast_trans_pvt *pvt, struct ast_frame *f)
 convert and store samples in outbuf
static int load_module (void)
static int reload (void)
static int ulawtolin_framein (struct ast_trans_pvt *pvt, struct ast_frame *f)
 convert and store samples in outbuf
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 = "8586c2a7d357cb591cc3a6607a8f62d1" , .load = load_module, .unload = unload_module, .reload = reload, }
static struct ast_module_infoast_module_info = &__mod_info
static struct ast_translator lintotestlaw
static struct ast_translator lintoulaw
 The complete translator for LinToulaw.
static struct ast_translator testlawtolin
static struct ast_translator ulawtolin
 The complete translator for ulawToLin.


Detailed Description

codec_ulaw.c - translate between signed linear and ulaw

Definition in file codec_ulaw.c.


Define Documentation

#define BUFFER_SAMPLES   8096

Definition at line 36 of file codec_ulaw.c.


Function Documentation

static void __reg_module ( void   )  [static]

Definition at line 160 of file codec_ulaw.c.

static void __unreg_module ( void   )  [static]

Definition at line 160 of file codec_ulaw.c.

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

convert and store samples in outbuf

Definition at line 60 of file codec_ulaw.c.

References AST_LIN2MU, ast_trans_pvt::c, ast_trans_pvt::datalen, f, ast_trans_pvt::outbuf, and ast_trans_pvt::samples.

00061 {
00062    int i = f->samples;
00063    char *dst = pvt->outbuf.c + pvt->samples;
00064    int16_t *src = f->data.ptr;
00065 
00066    pvt->samples += i;
00067    pvt->datalen += i;   /* 1 byte/sample */
00068 
00069    while (i--)
00070       *dst++ = AST_LIN2MU(*src++);
00071 
00072    return 0;
00073 }

static int load_module ( void   )  [static]

Definition at line 140 of file codec_ulaw.c.

References AST_MODULE_LOAD_FAILURE, AST_MODULE_LOAD_SUCCESS, ast_register_translator, ast_unregister_translator(), lintotestlaw, lintoulaw, testlawtolin, and ulawtolin.

00141 {
00142    int res;
00143 
00144    res = ast_register_translator(&ulawtolin);
00145    if (!res) {
00146       res = ast_register_translator(&lintoulaw);
00147       res |= ast_register_translator(&lintotestlaw);
00148       res |= ast_register_translator(&testlawtolin);
00149    } else
00150       ast_unregister_translator(&ulawtolin);
00151    if (res)
00152       return AST_MODULE_LOAD_FAILURE;
00153    return AST_MODULE_LOAD_SUCCESS;
00154 }

static int reload ( void   )  [static]

Definition at line 123 of file codec_ulaw.c.

References AST_MODULE_LOAD_SUCCESS.

00124 {
00125    return AST_MODULE_LOAD_SUCCESS;
00126 }

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

convert and store samples in outbuf

Definition at line 43 of file codec_ulaw.c.

References AST_MULAW, 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    /* convert and copy in outbuf */
00053    while (i--)
00054       *dst++ = AST_MULAW(*src++);
00055 
00056    return 0;
00057 }

static int unload_module ( void   )  [static]

Definition at line 128 of file codec_ulaw.c.

References ast_unregister_translator(), lintotestlaw, lintoulaw, testlawtolin, and ulawtolin.

00129 {
00130    int res;
00131 
00132    res = ast_unregister_translator(&lintoulaw);
00133    res |= ast_unregister_translator(&ulawtolin);
00134    res |= ast_unregister_translator(&testlawtolin);
00135    res |= ast_unregister_translator(&lintotestlaw);
00136 
00137    return res;
00138 }


Variable Documentation

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 = "8586c2a7d357cb591cc3a6607a8f62d1" , .load = load_module, .unload = unload_module, .reload = reload, } [static]

Definition at line 160 of file codec_ulaw.c.

struct ast_module_info* ast_module_info = &__mod_info [static]

Definition at line 160 of file codec_ulaw.c.

struct ast_translator lintotestlaw [static]

Definition at line 113 of file codec_ulaw.c.

Referenced by load_module(), and unload_module().

struct ast_translator lintoulaw [static]

The complete translator for LinToulaw.

Definition at line 103 of file codec_ulaw.c.

Referenced by dahdi_encoder_framein(), load_module(), and unload_module().

struct ast_translator testlawtolin [static]

Definition at line 89 of file codec_ulaw.c.

Referenced by load_module(), and unload_module().

struct ast_translator ulawtolin [static]

The complete translator for ulawToLin.

Definition at line 79 of file codec_ulaw.c.

Referenced by dahdi_decoder_frameout(), load_module(), and unload_module().


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