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"

Include dependency graph for codec_alaw.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 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 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 = AST_BUILDOPT_SUM, .support_level = AST_MODULE_SUPPORT_CORE, .load = load_module, .unload = unload_module, }
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 40 of file codec_alaw.c.


Function Documentation

static void __reg_module ( void   )  [static]

Definition at line 145 of file codec_alaw.c.

static void __unreg_module ( void   )  [static]

Definition at line 145 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 47 of file codec_alaw.c.

References AST_ALAW, 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    while (i--)
00057       *dst++ = AST_ALAW(*src++);
00058 
00059    return 0;
00060 }

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 63 of file codec_alaw.c.

References AST_LIN2A, 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.

00064 {
00065    int i = f->samples;
00066    char *dst = pvt->outbuf.c + pvt->samples;
00067    int16_t *src = f->data.ptr;
00068 
00069    pvt->samples += i;
00070    pvt->datalen += i;   /* 1 byte/sample */
00071 
00072    while (i--) 
00073       *dst++ = AST_LIN2A(*src++);
00074 
00075    return 0;
00076 }

static int load_module ( void   )  [static]

Definition at line 126 of file codec_alaw.c.

References AST_MODULE_LOAD_FAILURE, AST_MODULE_LOAD_SUCCESS, ast_register_translator, and unload_module.

00127 {
00128    int res;
00129 
00130    res = ast_register_translator(&alawtolin);
00131    res |= ast_register_translator(&lintoalaw);
00132 
00133    if (res) {
00134       unload_module();
00135       return AST_MODULE_LOAD_FAILURE;
00136    }
00137 
00138    return AST_MODULE_LOAD_SUCCESS;
00139 }

static int unload_module ( void   )  [static]

Definition at line 116 of file codec_alaw.c.

References ast_unregister_translator().

00117 {
00118    int res;
00119 
00120    res = ast_unregister_translator(&lintoalaw);
00121    res |= ast_unregister_translator(&alawtolin);
00122 
00123    return res;
00124 }


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

Definition at line 145 of file codec_alaw.c.

struct ast_translator alawtolin [static]

Definition at line 78 of file codec_alaw.c.

Definition at line 145 of file codec_alaw.c.

struct ast_translator lintoalaw [static]

Definition at line 97 of file codec_alaw.c.


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