This patch adds 'const' tags to a number of Asterisk APIs where they are appropriate (where the API already demanded that the function argument not be modified, but the compiler was not informed of that fact). The list includes: - CLI command handlers - CLI command handler arguments - AGI command handlers - AGI command handler arguments - Dialplan application handler arguments - Speech engine API function arguments In addition, various file-scope and function-scope constant arrays got 'const' and/or 'static' qualifiers where they were missing. Review: https://reviewboard.asterisk.org/r/251/ git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@196072 65c4cc65-6c06-0410-ace0-fbb531ad65f3
177 lines
4.3 KiB
C
177 lines
4.3 KiB
C
/*
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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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#include "asterisk/pbx.h"
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/*** DOCUMENTATION
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<application name="Milliwatt" language="en_US">
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<synopsis>
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Generate a Constant 1004Hz tone at 0dbm (mu-law).
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</synopsis>
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<syntax>
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<parameter name="options">
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<optionlist>
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<option name="o">
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<para>Generate the tone at 1000Hz like previous version.</para>
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</option>
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</optionlist>
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</parameter>
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</syntax>
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<description>
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<para>Previous versions of this application generated the tone at 1000Hz. If for
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some reason you would prefer that behavior, supply the <literal>o</literal> option to get the
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old behavior.</para>
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</description>
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</application>
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***/
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static const char app[] = "Milliwatt";
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static const 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 = ARRAY_LEN(buf);
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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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.src = __FUNCTION__,
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};
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wf.data.ptr = buf + AST_FRIENDLY_OFFSET;
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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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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 old_milliwatt_exec(struct ast_channel *chan)
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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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}
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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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;
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ast_deactivate_generator(chan);
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return -1;
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}
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static int milliwatt_exec(struct ast_channel *chan, const char *data)
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{
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const char *options = data;
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struct ast_app *playtones_app;
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int res = -1;
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if (!ast_strlen_zero(options) && strchr(options, 'o')) {
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return old_milliwatt_exec(chan);
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}
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if (!(playtones_app = pbx_findapp("Playtones"))) {
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ast_log(LOG_ERROR, "The Playtones application is required to run Milliwatt()\n");
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return -1;
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}
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res = pbx_exec(chan, playtones_app, "1004/1000");
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while (!res) {
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res = ast_safe_sleep(chan, 10000);
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}
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return res;
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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_xml(app, milliwatt_exec);
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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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