app_echo.c File Reference

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

#include "asterisk.h"
#include "asterisk/file.h"
#include "asterisk/module.h"
#include "asterisk/channel.h"

Include dependency graph for app_echo.c:

Go to the source code of this file.

Functions
static void	__reg_module (void)
static void	__unreg_module (void)
struct ast_module *	AST_MODULE_SELF_SYM (void)
static int	echo_exec (struct ast_channel *chan, const char *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_LOAD_ORDER , .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 = AST_BUILDOPT_SUM, .load = load_module, .unload = unload_module, .load_pri = AST_MODPRI_DEFAULT, .support_level = AST_MODULE_SUPPORT_CORE, }
static const char	app [] = "Echo"
static const struct ast_module_info *	ast_module_info = &__mod_info

Detailed Description

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

Author

Mark Spencer marks.nosp@m.ter@.nosp@m.digiu.nosp@m.m.co.nosp@m.m

Definition in file app_echo.c.

Function Documentation

__reg_module()

static void __reg_module ( void  )

static

Definition at line 113 of file app_echo.c.

__unreg_module()

static void __unreg_module ( void  )

static

Definition at line 113 of file app_echo.c.

AST_MODULE_SELF_SYM()

struct ast_module * AST_MODULE_SELF_SYM

(

void

)

Definition at line 113 of file app_echo.c.

echo_exec()

static int echo_exec ( struct ast_channel *  chan, const char *  data  )

static

Definition at line 56 of file app_echo.c.

{
    int res = -1;
    int fir_sent = 0;
 
    while (ast_waitfor(chan, -1) > -1) {
        struct ast_frame *f = ast_read(chan);
        if (!f) {
            break;
        }
        f->delivery.tv_sec = 0;
        f->delivery.tv_usec = 0;
        if (f->frametype == AST_FRAME_CONTROL
            && f->subclass.integer == AST_CONTROL_VIDUPDATE
            && !fir_sent) {
            if (ast_write(chan, f) < 0) {
                ast_frfree(f);
                goto end;
            }
            fir_sent = 1;
        }
        if (!fir_sent && f->frametype == AST_FRAME_VIDEO) {
            struct ast_frame frame = {
                .frametype = AST_FRAME_CONTROL,
                .subclass.integer = AST_CONTROL_VIDUPDATE,
            };
            ast_write(chan, &frame);
            fir_sent = 1;
        }
        if (f->frametype != AST_FRAME_CONTROL
            && f->frametype != AST_FRAME_MODEM
            && f->frametype != AST_FRAME_NULL
            && ast_write(chan, f)) {
            ast_frfree(f);
            goto end;
        }
        if ((f->frametype == AST_FRAME_DTMF) && (f->subclass.integer == '#')) {
            res = 0;
            ast_frfree(f);
            goto end;
        }
        ast_frfree(f);
    }
end:
    return res;
}

References AST_CONTROL_VIDUPDATE, AST_FRAME_CONTROL, AST_FRAME_DTMF, AST_FRAME_MODEM, AST_FRAME_NULL, AST_FRAME_VIDEO, ast_frfree, ast_read(), ast_waitfor(), ast_write(), ast_frame::delivery, end, ast_frame::frametype, ast_frame_subclass::integer, and ast_frame::subclass.

Referenced by load_module().

load_module()

static int load_module ( void  )

static

Definition at line 108 of file app_echo.c.

{
    return ast_register_application_xml(app, echo_exec);
}

References app, ast_register_application_xml, and echo_exec().

unload_module()

static int unload_module ( void  )

static

Definition at line 103 of file app_echo.c.

{
    return ast_unregister_application(app);
}

References app, and ast_unregister_application().

Variable Documentation

__mod_info

struct ast_module_info __mod_info = { .name = AST_MODULE, .flags = AST_MODFLAG_LOAD_ORDER , .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 = AST_BUILDOPT_SUM, .load = load_module, .unload = unload_module, .load_pri = AST_MODPRI_DEFAULT, .support_level = AST_MODULE_SUPPORT_CORE, }

static

Definition at line 113 of file app_echo.c.

app

const char app[] = "Echo"

static

Definition at line 54 of file app_echo.c.

Referenced by load_module(), and unload_module().

ast_module_info

const struct ast_module_info* ast_module_info = &__mod_info

static

Definition at line 113 of file app_echo.c.