Sat Nov 25 00:45:28 2006

Asterisk developer's documentation


app_milliwatt.c

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00001 /*
00002  * Asterisk -- An open source telephony toolkit.
00003  *
00004  * Copyright (C) 1999 - 2005, Digium, Inc.
00005  *
00006  * Mark Spencer <markster@digium.com>
00007  *
00008  * See http://www.asterisk.org for more information about
00009  * the Asterisk project. Please do not directly contact
00010  * any of the maintainers of this project for assistance;
00011  * the project provides a web site, mailing lists and IRC
00012  * channels for your use.
00013  *
00014  * This program is free software, distributed under the terms of
00015  * the GNU General Public License Version 2. See the LICENSE file
00016  * at the top of the source tree.
00017  */
00018 
00019 /*! \file
00020  *
00021  * \brief Digital Milliwatt Test
00022  * 
00023  * \ingroup applications
00024  */
00025 
00026 #include <stdlib.h>
00027 #include <stdio.h>
00028 #include <string.h>
00029 #include <unistd.h>
00030 #include <errno.h>
00031 
00032 #include "asterisk.h"
00033 
00034 ASTERISK_FILE_VERSION(__FILE__, "$Revision: 8232 $")
00035 
00036 #include "asterisk/lock.h"
00037 #include "asterisk/file.h"
00038 #include "asterisk/logger.h"
00039 #include "asterisk/channel.h"
00040 #include "asterisk/pbx.h"
00041 #include "asterisk/module.h"
00042 
00043 static char *tdesc = "Digital Milliwatt (mu-law) Test Application";
00044 
00045 static char *app = "Milliwatt";
00046 
00047 static char *synopsis = "Generate a Constant 1000Hz tone at 0dbm (mu-law)";
00048 
00049 static char *descrip = 
00050 "Milliwatt(): Generate a Constant 1000Hz tone at 0dbm (mu-law)\n";
00051 
00052 STANDARD_LOCAL_USER;
00053 
00054 LOCAL_USER_DECL;
00055 
00056 static char digital_milliwatt[] = {0x1e,0x0b,0x0b,0x1e,0x9e,0x8b,0x8b,0x9e} ;
00057 
00058 static void *milliwatt_alloc(struct ast_channel *chan, void *params)
00059 {
00060 int   *indexp;
00061    indexp = malloc(sizeof(int));
00062    if (indexp == NULL) return(NULL);
00063    *indexp = 0;
00064    return(indexp);
00065 }
00066 
00067 static void milliwatt_release(struct ast_channel *chan, void *data)
00068 {
00069    free(data);
00070    return;
00071 }
00072 
00073 static int milliwatt_generate(struct ast_channel *chan, void *data, int len, int samples)
00074 {
00075    struct ast_frame wf;
00076    unsigned char buf[AST_FRIENDLY_OFFSET + 640];
00077    int i,*indexp = (int *) data;
00078 
00079    if (len + AST_FRIENDLY_OFFSET > sizeof(buf))
00080    {
00081       ast_log(LOG_WARNING,"Only doing %d bytes (%d bytes requested)\n",(int)(sizeof(buf) - AST_FRIENDLY_OFFSET),len);
00082       len = sizeof(buf) - AST_FRIENDLY_OFFSET;
00083    }
00084    wf.frametype = AST_FRAME_VOICE;
00085    wf.subclass = AST_FORMAT_ULAW;
00086    wf.offset = AST_FRIENDLY_OFFSET;
00087    wf.mallocd = 0;
00088    wf.data = buf + AST_FRIENDLY_OFFSET;
00089    wf.datalen = len;
00090    wf.samples = wf.datalen;
00091    wf.src = "app_milliwatt";
00092    wf.delivery.tv_sec = 0;
00093    wf.delivery.tv_usec = 0;
00094    wf.prev = wf.next = NULL;
00095    /* create a buffer containing the digital milliwatt pattern */
00096    for(i = 0; i < len; i++)
00097    {
00098       buf[AST_FRIENDLY_OFFSET + i] = digital_milliwatt[(*indexp)++];
00099       *indexp &= 7;
00100    }
00101    if (ast_write(chan,&wf) < 0)
00102    {
00103       ast_log(LOG_WARNING,"Failed to write frame to '%s': %s\n",chan->name,strerror(errno));
00104       return -1;
00105    }
00106    return 0;
00107 }
00108 
00109 static struct ast_generator milliwattgen = 
00110 {
00111    alloc: milliwatt_alloc,
00112    release: milliwatt_release,
00113    generate: milliwatt_generate,
00114 } ;
00115 
00116 static int milliwatt_exec(struct ast_channel *chan, void *data)
00117 {
00118 
00119    struct localuser *u;
00120    LOCAL_USER_ADD(u);
00121    ast_set_write_format(chan, AST_FORMAT_ULAW);
00122    ast_set_read_format(chan, AST_FORMAT_ULAW);
00123    if (chan->_state != AST_STATE_UP)
00124    {
00125       ast_answer(chan);
00126    }
00127    if (ast_activate_generator(chan,&milliwattgen,"milliwatt") < 0)
00128    {
00129       ast_log(LOG_WARNING,"Failed to activate generator on '%s'\n",chan->name);
00130       LOCAL_USER_REMOVE(u);
00131       return -1;
00132    }
00133    while(!ast_safe_sleep(chan, 10000));
00134    ast_deactivate_generator(chan);
00135    LOCAL_USER_REMOVE(u);
00136    return -1;
00137 }
00138 
00139 int unload_module(void)
00140 {
00141    int res;
00142 
00143    res = ast_unregister_application(app);
00144 
00145    STANDARD_HANGUP_LOCALUSERS;
00146 
00147    return res;
00148 }
00149 
00150 int load_module(void)
00151 {
00152    return ast_register_application(app, milliwatt_exec, synopsis, descrip);
00153 }
00154 
00155 char *description(void)
00156 {
00157    return tdesc;
00158 }
00159 
00160 int usecount(void)
00161 {
00162    int res;
00163    STANDARD_USECOUNT(res);
00164    return res;
00165 }
00166 
00167 char *key()
00168 {
00169    return ASTERISK_GPL_KEY;
00170 }

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