/* Copyright (C) 2016 J.F.Dockes
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the
* Free Software Foundation, Inc.,
* 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#include "config.h"
#include <unistd.h>
#include <thread>
#include "watcher.h"
#include "rcvqueue.h"
#include "smallut.h"
using namespace std;
/* Parameters */
static string o_cmd;
static unsigned int o_idlesecs;
static unsigned int o_pollsecs;
static bool o_doclosealsa;
/* Queue we watch */
static AudioEater *o_eater;
/* Queue state */
static bool o_active;
static time_t o_last_active;
static unsigned int o_lastcntvalue;
static thread o_worker;
static void watcher(void *)
{
string argument;
for (;;) {
LOGDEB("watcher: active " << o_active << " lastpktcnt " <<
o_lastcntvalue << " pktcnt " << o_eater->pktcounter << endl);
if (!o_active && o_lastcntvalue != o_eater->pktcounter) {
// If not currently active and the packet counter changed,
// switch to active, exec command.
o_active = true;
argument = "on";
} else if (o_active && o_lastcntvalue == o_eater->pktcounter &&
time(0) - o_last_active > o_idlesecs) {
// If state currently active but no packet count change,
// and the delay is expired, switch to inactive and
// execute the command
o_active = false;
argument = "off";
LOGDEB("watcher: CLOSING ALSA " << endl);
if (o_doclosealsa) {
// The reopen is auto-performed by the audio queue to
// avoid delay.
alsa_close();
}
}
if (!argument.empty()) {
string cmd(o_cmd + " " + argument);
LOGDEB("watcher: executing " << cmd << endl);
int ret = system(cmd.c_str());
(void)ret;
argument.clear();
}
// In all cases, if the packet counter changed, record the new
// value and the current time
if (o_lastcntvalue != o_eater->pktcounter) {
o_lastcntvalue = o_eater->pktcounter;
o_last_active = time(0);
}
sleep(o_pollsecs);
}
}
void startWatcher(ConfSimple& config)
{
string cmd, sidlesecs, spollsecs, sclosealsa;
unsigned int idlesecs(900), pollsecs(2);
bool closealsa(true);
config.get("scwatchercmd", cmd);
config.get("scwatcheridlesecs", sidlesecs);
if (!sidlesecs.empty()) {
idlesecs = (unsigned int)atoi(sidlesecs.c_str());
}
config.get("scwatcherpollsecs", spollsecs);
if (!spollsecs.empty()) {
pollsecs = (unsigned int)atoi(spollsecs.c_str());
}
config.get("scwatcherclosealsa", sclosealsa);
if (!sclosealsa.empty()) {
closealsa = stringToBool(sclosealsa);
}
if (cmd.empty() && !closealsa) {
LOGDEB("startWatcher: no watcher: empty cmd and closealsa is false\n");
return;
}
o_cmd = cmd;
o_idlesecs = idlesecs ? idlesecs : 900;
o_pollsecs = pollsecs ? pollsecs : 2;
o_doclosealsa = closealsa;
o_eater = &alsaAudioEater;
o_worker = thread(watcher, nullptr);
o_worker.detach();
}