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