app_ices.c

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/*
 * Asterisk -- An open source telephony toolkit.
 *
 * Copyright (C) 1999 - 2005, Digium, Inc.
 *
 * Mark Spencer <[email protected]>
 *
 * 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.
 *
 * 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.
 */

/*! \file
 *
 * \brief Stream to an icecast server via ICES (see contrib/asterisk-ices.xml)
 *
 * \author Mark Spencer <[email protected]>
 *
 * ICES - http://www.icecast.org/ices.php
 *
 * \ingroup applications
 */

/*** MODULEINFO
 <support_level>deprecated</support_level>
 ***/

#include "asterisk.h"

#include <signal.h>
#include <fcntl.h>
#include <sys/time.h>

#include "asterisk/paths.h" /* use ast_config_AST_CONFIG_DIR */
#include "asterisk/lock.h"
#include "asterisk/file.h"
#include "asterisk/channel.h"
#include "asterisk/frame.h"
#include "asterisk/pbx.h"
#include "asterisk/module.h"
#include "asterisk/translate.h"
#include "asterisk/app.h"
#include "asterisk/format_cache.h"

/*** DOCUMENTATION
 <application name="ICES" language="en_US">
 <synopsis>
 Encode and stream using 'ices'.
 </synopsis>
 <syntax>
 <parameter name="config" required="true">
 <para>ICES configuration file.</para>
 </parameter>
 </syntax>
 <description>
 <para>Streams to an icecast server using ices (available separately).
 A configuration file must be supplied for ices (see contrib/asterisk-ices.xml).</para>
 <note><para>ICES version 2 client and server required.</para></note>
 </description>
 </application>

 ***/

#define path_BIN "/usr/bin/"
#define path_LOCAL "/usr/local/bin/"

static char *app = "ICES";

static int icesencode(char *filename, int fd)
{
 int res;

 res = ast_safe_fork(0);
 if (res < 0)
 ast_log(LOG_WARNING, "Fork failed\n");
 if (res) {
 return res;
 }

 if (ast_opt_high_priority)
 ast_set_priority(0);
 dup2(fd, STDIN_FILENO);
 ast_close_fds_above_n(STDERR_FILENO);

 /* Most commonly installed in /usr/local/bin
 * But many places has it in /usr/bin
 * As a last-ditch effort, try to use PATH
 */
 execl(path_LOCAL "ices2", "ices", filename, SENTINEL);
 execl(path_BIN "ices2", "ices", filename, SENTINEL);
 execlp("ices2", "ices", filename, SENTINEL);

 ast_debug(1, "Couldn't find ices version 2, attempting to use ices version 1.\n");

 execl(path_LOCAL "ices", "ices", filename, SENTINEL);
 execl(path_BIN "ices", "ices", filename, SENTINEL);
 execlp("ices", "ices", filename, SENTINEL);

 ast_log(LOG_WARNING, "Execute of ices failed, could not find command.\n");
 close(fd);
 _exit(0);
}

static int ices_exec(struct ast_channel *chan, const char *data)
{
 int res = 0;
 int fds[2];
 int ms = -1;
 int pid = -1;
 struct ast_format *oreadformat;
 struct ast_frame *f;
 char filename[256]="";
 char *c;

 if (ast_strlen_zero(data)) {
 ast_log(LOG_WARNING, "ICES requires an argument (configfile.xml)\n");
 return -1;
 }

 if (pipe(fds)) {
 ast_log(LOG_WARNING, "Unable to create pipe\n");
 return -1;
 }
 ast_fd_set_flags(fds[1], O_NONBLOCK);

 ast_stopstream(chan);

 if (ast_channel_state(chan) != AST_STATE_UP)
 res = ast_answer(chan);

 if (res) {
 close(fds[0]);
 close(fds[1]);
 ast_log(LOG_WARNING, "Answer failed!\n");
 return -1;
 }

 oreadformat = ao2_bump(ast_channel_readformat(chan));
 res = ast_set_read_format(chan, ast_format_slin);
 if (res < 0) {
 close(fds[0]);
 close(fds[1]);
 ast_log(LOG_WARNING, "Unable to set write format to signed linear\n");
 ao2_cleanup(oreadformat);
 return -1;
 }
 if (((char *)data)[0] == '/')
 ast_copy_string(filename, (char *) data, sizeof(filename));
 else
 snprintf(filename, sizeof(filename), "%s/%s", ast_config_AST_CONFIG_DIR, (char *)data);
 /* Placeholder for options */
 c = strchr(filename, '|');
 if (c)
 *c = '\0';
 res = icesencode(filename, fds[0]);
 if (res >= 0) {
 pid = res;
 for (;;) {
 /* Wait for audio, and stream */
 ms = ast_waitfor(chan, -1);
 if (ms < 0) {
 ast_debug(1, "Hangup detected\n");
 res = -1;
 break;
 }
 f = ast_read(chan);
 if (!f) {
 ast_debug(1, "Null frame == hangup() detected\n");
 res = -1;
 break;
 }
 if (f->frametype == AST_FRAME_VOICE) {
 res = write(fds[1], f->data.ptr, f->datalen);
 if (res < 0) {
 if (errno != EAGAIN) {
 ast_log(LOG_WARNING, "Write failed to pipe: %s\n", strerror(errno));
 res = -1;
 ast_frfree(f);
 break;
 }
 }
 }
 ast_frfree(f);
 }
 }
 close(fds[0]);
 close(fds[1]);

 if (pid > -1)
 kill(pid, SIGKILL);
 if (!res && oreadformat)
 ast_set_read_format(chan, oreadformat);
 ao2_cleanup(oreadformat);

 return res;
}

static int unload_module(void)
{
 return ast_unregister_application(app);
}

static int load_module(void)
{
 return ast_register_application_xml(app, ices_exec);
}

AST_MODULE_INFO_STANDARD_DEPRECATED(ASTERISK_GPL_KEY, "Encode and Stream via icecast and ices");