Add AudioBackend::info() method to retrieve AudioBackendInfo object

Goal is to be able to call AudioBackendInfo::already_configured() from the right place.

libs/ardour/ardour/audio_backend.h

@@ -42,12 +42,47 @@
 
 namespace ARDOUR {
 
+struct LIBARDOUR_API AudioBackendInfo {
+    const char* name;
+
+    /** Using arg1 and arg2, initialize this audiobackend.
+     * 
+     * Returns zero on success, non-zero otherwise.
+     */
+    int (*instantiate) (const std::string& arg1, const std::string& arg2);
+
+    /** Release all resources associated with this audiobackend
+     */
+    int (*deinstantiate) (void);
+
+    /** Factory method to create an AudioBackend-derived class.
+     * 
+     * Returns a valid shared_ptr to the object if successfull,
+     * or a "null" shared_ptr otherwise.
+     */
+    boost::shared_ptr<AudioBackend> (*factory) (AudioEngine&);
+
+    /** Return true if the underlying mechanism/API has been
+     * configured and does not need (re)configuration in order
+     * to be usable. Return false otherwise.
+     *
+     * Note that this may return true if (re)configuration, even though
+     * not currently required, is still possible.
+     */
+    bool (*already_configured)();
+};
+
 class LIBARDOUR_API AudioBackend : public PortEngine {
   public:
 
-    AudioBackend (AudioEngine& e) : PortEngine (e), engine (e) {}
+    AudioBackend (AudioEngine& e, AudioBackendInfo& i) : PortEngine (e), _info (i), engine (e) {}
     virtual ~AudioBackend () {}
     
+    /** Return the AudioBackendInfo object from which this backend
+	was constructed.
+    */
+    AudioBackendInfo& info() const { return _info; }
+
     /** Return the name of this backend.
      *
      * Should use a well-known, unique term. Expected examples
@@ -482,41 +517,12 @@ class LIBARDOUR_API AudioBackend : public PortEngine {
      }
 
   protected:
+     AudioBackendInfo&  _info; 
      AudioEngine&        engine;
 
      virtual int _start (bool for_latency_measurement) = 0;
 };
 
-struct LIBARDOUR_API AudioBackendInfo {
-    const char* name;
-
-    /** Using arg1 and arg2, initialize this audiobackend.
-     * 
-     * Returns zero on success, non-zero otherwise.
-     */
-    int (*instantiate) (const std::string& arg1, const std::string& arg2);
-
-    /** Release all resources associated with this audiobackend
-     */
-    int (*deinstantiate) (void);
-
-    /** Factory method to create an AudioBackend-derived class.
-     * 
-     * Returns a valid shared_ptr to the object if successfull,
-     * or a "null" shared_ptr otherwise.
-     */
-    boost::shared_ptr<AudioBackend> (*factory) (AudioEngine&);
-
-    /** Return true if the underlying mechanism/API has been
-     * configured and does not need (re)configuration in order
-     * to be usable. Return false otherwise.
-     *
-     * Note that this may return true if (re)configuration, even though
-     * not currently required, is still possible.
-     */
-    bool (*already_configured)();
-};
-
 } // namespace
 
 #endif /* __libardour_audiobackend_h__ */

libs/backends/dummy/dummy_audiobackend.cc

@@ -29,8 +29,8 @@ using namespace ARDOUR;
 static std::string s_instance_name;
 size_t DummyAudioBackend::_max_buffer_size = 8192;
 
-DummyAudioBackend::DummyAudioBackend (AudioEngine& e)
+DummyAudioBackend::DummyAudioBackend (AudioEngine& e, AudioBackendInfo& info)
-	: AudioBackend (e)
+	: AudioBackend (e, info)
 	, _running (false)
 	, _freewheeling (false)
 	, _samplerate (48000)
@@ -1017,11 +1017,24 @@ DummyAudioBackend::main_process_thread ()
 
 static boost::shared_ptr<DummyAudioBackend> _instance;
 
+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 ARDOUR::AudioBackendInfo _descriptor = {
+	"Dummy",
+	instantiate,
+	deinstantiate,
+	backend_factory,
+	already_configured,
+};
+
 static boost::shared_ptr<AudioBackend>
 backend_factory (AudioEngine& e)
 {
 	if (!_instance) {
-		_instance.reset (new DummyAudioBackend (e));
+		_instance.reset (new DummyAudioBackend (e, _descriptor));
 	}
 	return _instance;
 }
@@ -1046,14 +1059,6 @@ already_configured ()
 	return false;
 }
 
-static ARDOUR::AudioBackendInfo _descriptor = {
-	"Dummy",
-	instantiate,
-	deinstantiate,
-	backend_factory,
-	already_configured,
-};
-
 extern "C" ARDOURBACKEND_API ARDOUR::AudioBackendInfo* descriptor ()
 {
 	return &_descriptor;

libs/backends/dummy/dummy_audiobackend.h

@@ -142,7 +142,7 @@ class DummyMidiPort : public DummyPort {
 
 class DummyAudioBackend : public AudioBackend {
 	public:
-		DummyAudioBackend (AudioEngine& e);
+	         DummyAudioBackend (AudioEngine& e, AudioBackendInfo& info);
 		~DummyAudioBackend ();
 
 		/* AUDIOBACKEND API */

libs/backends/jack/jack_api.cc

@@ -25,6 +25,19 @@ 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,
+};
+
 static boost::shared_ptr<AudioBackend>
 backend_factory (AudioEngine& ae)
 {
@@ -33,7 +46,7 @@ backend_factory (AudioEngine& ae)
 	}
 
 	if (!backend) {
-		backend.reset (new JACKAudioBackend (ae, jack_connection));
+		backend.reset (new JACKAudioBackend (ae, _descriptor, jack_connection));
 	}
 
 	return backend;
@@ -66,13 +79,5 @@ already_configured ()
 	return !JackConnection::in_control ();
 }
 
-static ARDOUR::AudioBackendInfo _descriptor = {
-	"JACK",
-	instantiate,
-	deinstantiate,
-	backend_factory,
-	already_configured,
-};
-
 extern "C" ARDOURBACKEND_API ARDOUR::AudioBackendInfo* descriptor() { return &_descriptor; }
 

libs/backends/jack/jack_audiobackend.cc

@@ -50,8 +50,8 @@ using std::vector;
 #define GET_PRIVATE_JACK_POINTER(localvar)  jack_client_t* localvar = _jack_connection->jack(); if (!(localvar)) { return; }
 #define GET_PRIVATE_JACK_POINTER_RET(localvar,r) jack_client_t* localvar = _jack_connection->jack(); if (!(localvar)) { return r; }
 
-JACKAudioBackend::JACKAudioBackend (AudioEngine& e, boost::shared_ptr<JackConnection> jc)
+JACKAudioBackend::JACKAudioBackend (AudioEngine& e, AudioBackendInfo& info, boost::shared_ptr<JackConnection> jc)
-	: AudioBackend (e)
+	: AudioBackend (e, info)
 	, _jack_connection (jc)
 	, _running (false)
 	, _freewheeling (false)

libs/backends/jack/jack_audiobackend.h

@@ -41,7 +41,7 @@ class JACKSession;
 
 class JACKAudioBackend : public AudioBackend {
   public:
-    JACKAudioBackend (AudioEngine& e, boost::shared_ptr<JackConnection>);
+    JACKAudioBackend (AudioEngine& e, AudioBackendInfo& info, boost::shared_ptr<JackConnection>);
     ~JACKAudioBackend ();
     
     /* AUDIOBACKEND API */

libs/backends/wavesaudio/waves_audiobackend.cc

@@ -23,6 +23,16 @@
 
 using namespace ARDOUR;
 
+#ifdef __MINGW64__
+	extern "C" __declspec(dllexport) ARDOUR::AudioBackendInfo* descriptor ()
+#else
+	extern "C" ARDOURBACKEND_API ARDOUR::AudioBackendInfo* descriptor ()
+#endif
+{
+    // COMMENTED DBG LOGS */ std::cout  << "waves_backend.dll : ARDOUR::AudioBackendInfo* descriptor (): " << std::endl;
+    return &WavesAudioBackend::backend_info ();
+}
+
 void WavesAudioBackend::AudioDeviceManagerNotification (NotificationReason reason, void* parameter)
 {
     switch (reason) {
@@ -83,8 +93,8 @@ void WavesAudioBackend::AudioDeviceManagerNotification (NotificationReason reaso
 }
 
 
-WavesAudioBackend::WavesAudioBackend (AudioEngine& e)
+WavesAudioBackend::WavesAudioBackend (AudioEngine& e, AudioBackendInfo& info)
-    : AudioBackend (e)
+    : AudioBackend (e, info)
     , _audio_device_manager (this)
     , _midi_device_manager (*this)
     , _device (NULL)
@@ -1274,7 +1284,7 @@ WavesAudioBackend::__waves_backend_factory (AudioEngine& e)
 {
     // COMMENTED DBG LOGS */ std::cout << "WavesAudioBackend::__waves_backend_factory ():" << std::endl;
     if (!__instance) {
-        __instance.reset (new WavesAudioBackend (e));
+        __instance.reset (new WavesAudioBackend (e, descriptor()));
     }
     return __instance;
 }
@@ -1365,12 +1375,3 @@ AudioBackendInfo WavesAudioBackend::__backend_info = {
     WavesAudioBackend::__already_configured,
 };
 
-#ifdef __MINGW64__
-	extern "C" __declspec(dllexport) ARDOUR::AudioBackendInfo* descriptor ()
-#else
-	extern "C" ARDOURBACKEND_API ARDOUR::AudioBackendInfo* descriptor ()
-#endif
-{
-    // COMMENTED DBG LOGS */ std::cout  << "waves_backend.dll : ARDOUR::AudioBackendInfo* descriptor (): " << std::endl;
-    return &WavesAudioBackend::backend_info ();
-}

libs/backends/wavesaudio/waves_audiobackend.h

@@ -70,7 +70,7 @@ class WavesMidiPort;
     class WavesAudioBackend : public AudioBackend, WCMRAudioDeviceManagerClient
 {
   public:
-    WavesAudioBackend (AudioEngine& e);
+    WavesAudioBackend (AudioEngine& e, AudioBackendInfo&);
     virtual ~WavesAudioBackend ();
 
     /* AUDIOBACKEND API */