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livetrax/libs/backends/jack/jack_api.cc

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/*
Copyright (C) 2013 Paul Davis
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., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include "jack_connection.h"
#include "jack_audiobackend.h"
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using namespace ARDOUR;
static boost::shared_ptr<JACKAudioBackend> backend;
static boost::shared_ptr<JackConnection> jack_connection;
static boost::shared_ptr<AudioBackend> backend_factory (AudioEngine& ae);
static int instantiate (const std::string& arg1, const std::string& arg2);
static int deinstantiate ();
static bool already_configured ();
static ARDOUR::AudioBackendInfo _descriptor = {
"JACK",
instantiate,
deinstantiate,
backend_factory,
already_configured,
};
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static boost::shared_ptr<AudioBackend>
backend_factory (AudioEngine& ae)
{
if (!jack_connection) {
return boost::shared_ptr<AudioBackend>();
}
if (!backend) {
backend.reset (new JACKAudioBackend (ae, _descriptor, jack_connection));
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}
return backend;
}
static int
instantiate (const std::string& arg1, const std::string& arg2)
{
try {
jack_connection.reset (new JackConnection (arg1, arg2));
} catch (...) {
return -1;
}
return 0;
}
static int
deinstantiate ()
{
backend.reset ();
jack_connection.reset ();
return 0;
}
static bool
already_configured ()
{
return !JackConnection::in_control ();
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}
extern "C" ARDOURBACKEND_API ARDOUR::AudioBackendInfo* descriptor() { return &_descriptor; }
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