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    /*
    
     * Asterisk -- An open source telephony toolkit.
    
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     *
    
     * Copyright (C) 1999 - 2005, Digium, Inc.
     *
     * Mark Spencer <markster@digium.com>
    
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     *
    
     * See http://www.asterisk.org for more information about
     * the Asterisk project. Please do not directly contact
     * any of the maintainers of this project for assistance;
     * the project provides a web site, mailing lists and IRC
     * channels for your use.
    
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     *
     * This program is free software, distributed under the terms of
    
     * the GNU General Public License Version 2. See the LICENSE file
     * at the top of the source tree.
     */
    
    
     * \brief Digital Milliwatt Test
    
     *
     * \author Mark Spencer <markster@digium.com>
    
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     * \ingroup applications
    
    #include "asterisk.h"
    
    ASTERISK_FILE_VERSION(__FILE__, "$Revision$")
    
    
    #include <stdlib.h>
    
    #include <stdio.h>
    
    #include <string.h>
    
    #include <unistd.h>
    
    #include <errno.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"
    
    #include "asterisk/utils.h"
    
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    static char *app = "Milliwatt";
    
    static char *synopsis = "Generate a Constant 1000Hz tone at 0dbm (mu-law)";
    
    static char *descrip = 
    "Milliwatt(): Generate a Constant 1000Hz tone at 0dbm (mu-law)\n";
    
    
    static char digital_milliwatt[] = {0x1e,0x0b,0x0b,0x1e,0x9e,0x8b,0x8b,0x9e} ;
    
    static void *milliwatt_alloc(struct ast_channel *chan, void *params)
    {
    
    	return ast_calloc(1, sizeof(int));
    
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    }
    
    static void milliwatt_release(struct ast_channel *chan, void *data)
    {
    	free(data);
    	return;
    }
    
    
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    static int milliwatt_generate(struct ast_channel *chan, void *data, int len, int samples)
    
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    {
    
    	unsigned char buf[AST_FRIENDLY_OFFSET + 640];
    
    	const int maxsamples = sizeof (buf) / sizeof (buf[0]);
    	int i, *indexp = (int *) data;
    
    	struct ast_frame wf = {
    		.frametype = AST_FRAME_VOICE,
    		.subclass = AST_FORMAT_ULAW,
    		.offset = AST_FRIENDLY_OFFSET,
    		.data = buf + AST_FRIENDLY_OFFSET,
    		.src = __FUNCTION__,
    	};
    
    
    	/* Instead of len, use samples, because channel.c generator_force
    	* generate(chan, tmp, 0, 160) ignores len. In any case, len is
    	* a multiple of samples, given by number of samples times bytes per
    	* sample. In the case of ulaw, len = samples. for signed linear
    	* len = 2 * samples */
    
    	if (samples > maxsamples) {
    		ast_log(LOG_WARNING, "Only doing %d samples (%d requested)\n", maxsamples, samples);
    		samples = maxsamples;
    
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    	}
    
    	len = samples * sizeof (buf[0]);
    
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    	wf.datalen = len;
    
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    	/* create a buffer containing the digital milliwatt pattern */
    	for(i = 0; i < len; i++)
    	{
    
    		buf[AST_FRIENDLY_OFFSET + i] = digital_milliwatt[(*indexp)++];
    
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    		*indexp &= 7;
    	}
    	if (ast_write(chan,&wf) < 0)
    	{
    		ast_log(LOG_WARNING,"Failed to write frame to '%s': %s\n",chan->name,strerror(errno));
    		return -1;
    	}
    	return 0;
    }
    
    static struct ast_generator milliwattgen = 
    {
    	alloc: milliwatt_alloc,
    	release: milliwatt_release,
    	generate: milliwatt_generate,
    } ;
    
    static int milliwatt_exec(struct ast_channel *chan, void *data)
    {
    
    
    	struct ast_module_user *u;
    	u = ast_module_user_add(chan);
    
    	ast_set_write_format(chan, AST_FORMAT_ULAW);
    	ast_set_read_format(chan, AST_FORMAT_ULAW);
    
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    	if (chan->_state != AST_STATE_UP)
    
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    	{
    		ast_answer(chan);
    	}
    	if (ast_activate_generator(chan,&milliwattgen,"milliwatt") < 0)
    	{
    		ast_log(LOG_WARNING,"Failed to activate generator on '%s'\n",chan->name);
    
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    		return -1;
    	}
    	while(!ast_safe_sleep(chan, 10000));
    	ast_deactivate_generator(chan);
    
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    	return -1;
    }
    
    
    static int unload_module(void)
    
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    {
    
    	ast_module_user_hangup_all();
    
    static int load_module(void)
    
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    {
    	return ast_register_application(app, milliwatt_exec, synopsis, descrip);
    }
    
    
    AST_MODULE_INFO_STANDARD(ASTERISK_GPL_KEY, "Digital Milliwatt (mu-law) Test Application");