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"

Include dependency graph for codec_ulaw.c:

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 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 = AST_BUILDOPT_SUM, .support_level = AST_MODULE_SUPPORT_CORE, .load = load_module, .unload = unload_module, }
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 40 of file codec_ulaw.c.


Function Documentation

static void __reg_module ( void   )  [static]

Definition at line 196 of file codec_ulaw.c.

static void __unreg_module ( void   )  [static]

Definition at line 196 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 64 of file codec_ulaw.c.

References AST_LIN2MU, ast_trans_pvt::c, ast_frame::data, ast_trans_pvt::datalen, ast_trans_pvt::outbuf, ast_frame::ptr, ast_trans_pvt::samples, and ast_frame::samples.

00065 {
00066    int i = f->samples;
00067    char *dst = pvt->outbuf.c + pvt->samples;
00068    int16_t *src = f->data.ptr;
00069 
00070    pvt->samples += i;
00071    pvt->datalen += i;   /* 1 byte/sample */
00072 
00073    while (i--)
00074       *dst++ = AST_LIN2MU(*src++);
00075 
00076    return 0;
00077 }

static int load_module ( void   )  [static]

Definition at line 175 of file codec_ulaw.c.

References AST_MODULE_LOAD_FAILURE, AST_MODULE_LOAD_SUCCESS, ast_register_translator, and unload_module.

00176 {
00177    int res;
00178 
00179    res = ast_register_translator(&ulawtolin);
00180    res |= ast_register_translator(&lintoulaw);
00181    res |= ast_register_translator(&lintotestlaw);
00182    res |= ast_register_translator(&testlawtolin);
00183 
00184    if (res) {
00185       unload_module();
00186       return AST_MODULE_LOAD_FAILURE;
00187    }
00188 
00189    return AST_MODULE_LOAD_SUCCESS;
00190 }

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

convert and store samples in outbuf

Definition at line 47 of file codec_ulaw.c.

References AST_MULAW, ast_frame::data, ast_trans_pvt::datalen, ast_trans_pvt::i16, ast_trans_pvt::outbuf, ast_frame::ptr, ast_trans_pvt::samples, and ast_frame::samples.

00048 {
00049    int i = f->samples;
00050    unsigned char *src = f->data.ptr;
00051    int16_t *dst = pvt->outbuf.i16 + pvt->samples;
00052 
00053    pvt->samples += i;
00054    pvt->datalen += i * 2;  /* 2 bytes/sample */
00055 
00056    /* convert and copy in outbuf */
00057    while (i--)
00058       *dst++ = AST_MULAW(*src++);
00059 
00060    return 0;
00061 }

static int unload_module ( void   )  [static]

Definition at line 163 of file codec_ulaw.c.

References ast_unregister_translator().

00164 {
00165    int res;
00166 
00167    res = ast_unregister_translator(&lintoulaw);
00168    res |= ast_unregister_translator(&ulawtolin);
00169    res |= ast_unregister_translator(&testlawtolin);
00170    res |= ast_unregister_translator(&lintotestlaw);
00171 
00172    return res;
00173 }


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

Definition at line 196 of file codec_ulaw.c.

Definition at line 196 of file codec_ulaw.c.

struct ast_translator lintotestlaw [static]

Definition at line 144 of file codec_ulaw.c.

struct ast_translator lintoulaw [static]

The complete translator for LinToulaw.

Definition at line 125 of file codec_ulaw.c.

Referenced by dahdi_encoder_framein().

struct ast_translator testlawtolin [static]

Definition at line 102 of file codec_ulaw.c.

struct ast_translator ulawtolin [static]

The complete translator for ulawToLin.

Definition at line 83 of file codec_ulaw.c.

Referenced by dahdi_decoder_frameout().


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