Thu May 14 14:49:15 2009

Asterisk developer's documentation


app_echo.c File Reference

Echo application -- play back what you hear to evaluate latency. More...

#include "asterisk.h"
#include <stdlib.h>
#include <stdio.h>
#include <unistd.h>
#include <string.h>
#include "asterisk/lock.h"
#include "asterisk/file.h"
#include "asterisk/logger.h"
#include "asterisk/channel.h"
#include "asterisk/pbx.h"
#include "asterisk/module.h"

Go to the source code of this file.

Functions

static void __reg_module (void)
static void __unreg_module (void)
static int echo_exec (struct ast_channel *chan, void *data)
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 | AST_MODFLAG_BUILDSUM, .description = "Simple Echo Application" , .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 = "f450f61f60e761b3aa089ebed76ca8a5" , .load = load_module, .unload = unload_module, }
static char * app = "Echo"
static const struct ast_module_infoast_module_info = &__mod_info
static char * descrip
static char * synopsis = "Echo audio, video, or DTMF back to the calling party"


Detailed Description

Echo application -- play back what you hear to evaluate latency.

Author:
Mark Spencer <markster@digium.com>

Definition in file app_echo.c.


Function Documentation

static void __reg_module ( void   )  [static]

Definition at line 104 of file app_echo.c.

static void __unreg_module ( void   )  [static]

Definition at line 104 of file app_echo.c.

static int echo_exec ( struct ast_channel chan,
void *  data 
) [static]

Definition at line 54 of file app_echo.c.

References ast_best_codec(), AST_FRAME_DTMF, ast_frfree, ast_module_user_add, ast_module_user_remove, ast_read(), ast_set_read_format(), ast_set_write_format(), ast_waitfor(), ast_write(), ast_module_user::chan, f, format, and ast_channel::nativeformats.

Referenced by load_module().

00055 {
00056    int res = -1;
00057    int format;
00058    struct ast_module_user *u;
00059 
00060    u = ast_module_user_add(chan);
00061 
00062    format = ast_best_codec(chan->nativeformats);
00063    ast_set_write_format(chan, format);
00064    ast_set_read_format(chan, format);
00065 
00066    while (ast_waitfor(chan, -1) > -1) {
00067       struct ast_frame *f = ast_read(chan);
00068       if (!f)
00069          break;
00070       f->delivery.tv_sec = 0;
00071       f->delivery.tv_usec = 0;
00072       if (ast_write(chan, f)) {
00073          ast_frfree(f);
00074          goto end;
00075       }
00076       if ((f->frametype == AST_FRAME_DTMF) && (f->subclass == '#')) {
00077          res = 0;
00078          ast_frfree(f);
00079          goto end;
00080       }
00081       ast_frfree(f);
00082    }
00083 end:
00084    ast_module_user_remove(u);
00085    return res;
00086 }

static int load_module ( void   )  [static]

Definition at line 99 of file app_echo.c.

References ast_register_application(), and echo_exec().

00100 {
00101    return ast_register_application(app, echo_exec, synopsis, descrip);
00102 }

static int unload_module ( void   )  [static]

Definition at line 88 of file app_echo.c.

References ast_module_user_hangup_all, and ast_unregister_application().

00089 {
00090    int res;
00091 
00092    res = ast_unregister_application(app);
00093 
00094    ast_module_user_hangup_all();
00095 
00096    return res;
00097 }


Variable Documentation

struct ast_module_info __mod_info = { .name = AST_MODULE, .flags = AST_MODFLAG_DEFAULT | AST_MODFLAG_BUILDSUM, .description = "Simple Echo Application" , .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 = "f450f61f60e761b3aa089ebed76ca8a5" , .load = load_module, .unload = unload_module, } [static]

Definition at line 104 of file app_echo.c.

char* app = "Echo" [static]

Definition at line 44 of file app_echo.c.

const struct ast_module_info* ast_module_info = &__mod_info [static]

Definition at line 104 of file app_echo.c.

char* descrip [static]

Initial value:

 
"  Echo(): This application will echo any audio, video, or DTMF frames read from\n"
"the calling channel back to itself. If the DTMF digit '#' is received, the\n"
"application will exit.\n"

Definition at line 48 of file app_echo.c.

char* synopsis = "Echo audio, video, or DTMF back to the calling party" [static]

Definition at line 46 of file app_echo.c.


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