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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/ardour/ardour/audio_backend.h
View file

@ -70,6 +70,14 @@ struct LIBARDOUR_API AudioBackendInfo {
* not currently required, is still possible.
*/
bool (*already_configured)();
/** Return true if the underlying mechanism/API can be
* used on the given system.
*
* If this function returns false, the backend is not
* listed in the engine dialog.
*/
bool (*available)();
};
class LIBARDOUR_API AudioBackend : public PortEngine {

8
libs/backends/alsa/alsa_audiobackend.cc
View file

@ -1567,6 +1567,7 @@ static boost::shared_ptr<AudioBackend> backend_factory (AudioEngine& e);
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 = {
"ALSA",
@ -1574,6 +1575,7 @@ static ARDOUR::AudioBackendInfo _descriptor = {
deinstantiate,
backend_factory,
already_configured,
available
};
static boost::shared_ptr<AudioBackend>
@ -1605,6 +1607,12 @@ already_configured ()
return false;
}
static bool
available ()
{
return true;
}
extern "C" ARDOURBACKEND_API ARDOUR::AudioBackendInfo* descriptor ()
{
return &_descriptor;

8
libs/backends/dummy/dummy_audiobackend.cc
View file

@ -1207,6 +1207,7 @@ static boost::shared_ptr<AudioBackend> backend_factory (AudioEngine& e);
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 = {
"Dummy",
@ -1214,6 +1215,7 @@ static ARDOUR::AudioBackendInfo _descriptor = {
deinstantiate,
backend_factory,
already_configured,
available
};
static boost::shared_ptr<AudioBackend>
@ -1245,6 +1247,12 @@ already_configured ()
return false;
}
static bool
available ()
{
return true;
}
extern "C" ARDOURBACKEND_API ARDOUR::AudioBackendInfo* descriptor ()
{
return &_descriptor;

8
libs/backends/jack/jack_api.cc
View file

@ -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; }

8
libs/backends/wavesaudio/waves_audiobackend.cc
View file

@ -1254,6 +1254,13 @@ WavesAudioBackend::__already_configured ()
return false;
}
bool
WavesAudioBackend::__available ()
{
// COMMENTED DBG LOGS */ std::cout << "WavesAudioBackend::__available ():" << std::endl;
return true;
}
void*
WavesAudioBackend::private_handle () const
@ -1298,6 +1305,7 @@ AudioBackendInfo WavesAudioBackend::__backend_info = {
WavesAudioBackend::__deinstantiate,
WavesAudioBackend::__waves_backend_factory,
WavesAudioBackend::__already_configured,
WavesAudioBackend::__available,
};

1
libs/backends/wavesaudio/waves_audiobackend.h
View file

@ -335,6 +335,7 @@ class WavesMidiPort;
static int __instantiate (const std::string& arg1, const std::string& arg2);
static int __deinstantiate ();
static bool __already_configured ();
static bool __available ();
static void* __start_process_thread (void*);
static uint64_t __get_time_nanos ();