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add 'available' interface to the AudioBackendInfo

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If a backend can be loaded, it does not mean that it can be used;
e.g. weak-linked jack-backend if libjack is not available.
This commit is contained in:
Robin Gareus 2014-10-23 13:02:02 +02:00
parent f3ff1b9669
commit d991bb10ca
6 changed files with 41 additions and 0 deletions
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8
libs/backends/jack/jack_api.cc
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@ -29,6 +29,7 @@ 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 bool available ();
static ARDOUR::AudioBackendInfo _descriptor = {
"JACK",
@ -36,6 +37,7 @@ static ARDOUR::AudioBackendInfo _descriptor = {
deinstantiate,
backend_factory,
already_configured,
available
};
static boost::shared_ptr<AudioBackend>
@ -79,5 +81,11 @@ already_configured ()
return !JackConnection::in_control ();
}
static bool
available ()
{
return have_libjack() ? false : true;
}
extern "C" ARDOURBACKEND_API ARDOUR::AudioBackendInfo* descriptor() { return &_descriptor; }