substantive changes to allow the audio/MIDI setup dialog to change settings as intended

So far only tested with JACK backend, but expected to be more correct for other backends too

4 files changed, 83 insertions, 19 deletions

diff --git a/libs/backends/jack/jack_audiobackend.cc b/libs/backends/jack/jack_audiobackend.cc
index b3dbdcae71..1e7cb9d8d5 100644
--- a/libs/backends/jack/jack_audiobackend.cc
+++ b/libs/backends/jack/jack_audiobackend.cc
@@ -57,8 +57,8 @@ JACKAudioBackend::JACKAudioBackend (AudioEngine& e, boost::shared_ptr<JackConnec
 	, _target_buffer_size (1024)
 	, _target_sample_format (FormatFloat)
 	, _target_interleaved (false)
-	, _target_input_channels (-1)
-	, _target_output_channels (-1)
+	, _target_input_channels (0)
+	, _target_output_channels (0)
 	, _target_systemic_input_latency (0)
 	, _target_systemic_output_latency (0)
 	, _current_sample_rate (0)
@@ -292,7 +292,10 @@ int
 JACKAudioBackend::set_input_channels (uint32_t cnt)
 {
 	if (available()) {
-		return -1;
+		if (cnt != 0) {
+			/* can't set a real value for this while JACK runs */
+			return -1;
+		}
 	}
 
 	_target_input_channels = cnt;
@@ -304,7 +307,10 @@ int
 JACKAudioBackend::set_output_channels (uint32_t cnt)
 {
 	if (available()) {
-		return -1;
+		if (cnt != 0) {
+			/* can't set a real value for this while JACK runs */
+			return -1;
+		}
 	}
 
 	_target_output_channels = cnt;
@@ -316,6 +322,7 @@ int
 JACKAudioBackend::set_systemic_input_latency (uint32_t l)
 {
 	if (available()) {
+		/* can't do this while JACK runs */
 		return -1;
 	}
 
@@ -328,6 +335,7 @@ int
 JACKAudioBackend::set_systemic_output_latency (uint32_t l)
 {
 	if (available()) {
+		/* can't do this while JACK runs */
 		return -1;
 	}
 
@@ -341,18 +349,34 @@ JACKAudioBackend::set_systemic_output_latency (uint32_t l)
 std::string
 JACKAudioBackend::device_name () const
 {
-	if (available()) {
-		return "???";
+	if (!_jack_connection->in_control()) {
+		return "???"; // JACK has no way (as of fall 2013) to return
+			      // the device name
 	} 
 
 	return _target_device;
 }
 
+std::string
+JACKAudioBackend::driver_name() const
+{
+	if (!_jack_connection->in_control()) {
+		return "???"; // JACK has no way (as of fall 2013) to return
+			      // the driver name
+	}
+
+	return _target_driver;
+}
+
 float
 JACKAudioBackend::sample_rate () const
 {
-	if (available()) {
-		return _current_sample_rate;
+	if (!_jack_connection->in_control()) {
+		if (available()) {
+			return _current_sample_rate;
+		} else {
+			return 0;
+		}
 	}
 	return _target_sample_rate;
 }
@@ -360,8 +384,12 @@ JACKAudioBackend::sample_rate () const
 uint32_t
 JACKAudioBackend::buffer_size () const
 {
-	if (available()) {
-		return _current_buffer_size;
+	if (!_jack_connection->in_control()) {
+		if (available()) {
+			return _current_buffer_size;
+		} else {
+			return 0;
+		}
 	}
 	return _target_buffer_size;
 }
@@ -381,19 +409,37 @@ JACKAudioBackend::interleaved () const
 uint32_t
 JACKAudioBackend::input_channels () const
 {
-	if (available()) {
-		return n_physical (JackPortIsInput).n_audio();
-	} 
-	return _target_input_channels;
+	if (!_jack_connection->in_control()) {
+		if (available()) {
+			return n_physical (JackPortIsInput).n_audio();
+		} else {
+			return 0;
+		}
+	} else {
+		if (available()) {
+			return n_physical (JackPortIsInput).n_audio();
+		} else {
+			return _target_input_channels;
+		}
+	}
 }
 
 uint32_t
 JACKAudioBackend::output_channels () const
 {
-	if (available()) {
-		return n_physical (JackPortIsOutput).n_audio();
-	} 
-	return _target_output_channels;
+	if (!_jack_connection->in_control()) {
+		if (available()) {
+			return n_physical (JackPortIsOutput).n_audio();
+		} else {
+			return 0;
+		}
+	} else {
+		if (available()) {
+			return n_physical (JackPortIsOutput).n_audio();
+		} else {
+			return _target_output_channels;
+		}
+	}
 }
 
 uint32_t
diff --git a/libs/backends/jack/jack_audiobackend.h b/libs/backends/jack/jack_audiobackend.h
index 655c939c51..9ab545f3ee 100644
--- a/libs/backends/jack/jack_audiobackend.h
+++ b/libs/backends/jack/jack_audiobackend.h
@@ -85,6 +85,7 @@ class JACKAudioBackend : public AudioBackend {
     uint32_t     output_channels () const;
     uint32_t     systemic_input_latency () const;
     uint32_t     systemic_output_latency () const;
+    std::string  driver_name() const;
 
     std::string control_app_name () const;
     void launch_control_app ();
diff --git a/libs/backends/jack/jack_connection.cc b/libs/backends/jack/jack_connection.cc
index 7b3d35efa5..d5d25c747f 100644
--- a/libs/backends/jack/jack_connection.cc
+++ b/libs/backends/jack/jack_connection.cc
@@ -54,6 +54,7 @@ JackConnection::JackConnection (const std::string& arg1, const std::string& arg2
 	, _client_name (arg1)
 	, session_uuid (arg2)
 {
+	_in_control = !server_running();
 }
 
 JackConnection::~JackConnection ()
@@ -105,6 +106,19 @@ JackConnection::open ()
                 global_epa->restore ();
         }
 
+	/* check to see if the server is already running so that we know if we
+	 * are starting it.
+	 */
+
+	jack_client_t* c = jack_client_open ("ardourprobe", JackNoStartServer, &status);
+
+	if (status == 0) {
+		_in_control = false;
+		jack_client_close (c);
+	} else {
+		_in_control = true;
+	}
+
 	/* ensure that PATH or equivalent includes likely locations of the JACK
 	 * server, in case the user's default does not.
 	 */
diff --git a/libs/backends/jack/jack_connection.h b/libs/backends/jack/jack_connection.h
index cd45f3b9ba..229d9697d9 100644
--- a/libs/backends/jack/jack_connection.h
+++ b/libs/backends/jack/jack_connection.h
@@ -27,12 +27,15 @@ class JackConnection {
     void halted_callback ();
     void halted_info_callback (jack_status_t, const char*);
 
-    static bool server_running();
+    bool in_control() const { return _in_control; }
 
+    static bool server_running();
+    
   private:
     jack_client_t* volatile _jack;
     std::string _client_name;
     std::string session_uuid;
+    bool _in_control;
 };
 
 } // namespace