src/juce_appframework/audio/devices/juce_AudioDeviceManager.cpp

@@ -106,7 +106,7 @@ const String AudioDeviceManager::initialise (const int numInputChannelsNeeded,
             setMidiInputEnabled (allMidiIns[i], enabledMidiIns.contains (allMidiIns[i]));
 
         if (error.isNotEmpty() && selectDefaultDeviceOnFailure)
-            error = initialise (numInputChannelsNeeded, numOutputChannelsNeeded, 0, 
+            error = initialise (numInputChannelsNeeded, numOutputChannelsNeeded, 0,
                                 false, preferredDefaultDeviceName);
 
         setDefaultMidiOutput (e->getStringAttribute (T("defaultMidiOutput")));
@@ -357,6 +357,44 @@ void AudioDeviceManager::stopDevice()
         currentAudioDevice->stop();
 }
 
+void AudioDeviceManager::closeAudioDevice()
+{
+    if (currentAudioDevice != 0)
+    {
+        lastRunningDevice = currentAudioDevice->getName();
+        lastRunningBlockSize = currentAudioDevice->getCurrentBufferSizeSamples();
+        lastRunningSampleRate = currentAudioDevice->getCurrentSampleRate();
+        lastRunningIns = inputChannels;
+        lastRunningOuts = outputChannels;
+
+        stopDevice();
+
+        setAudioDevice (String::empty, 0, 0, 0, 0, false);
+    }
+}
+
+void AudioDeviceManager::restartLastAudioDevice()
+{
+    if (currentAudioDevice == 0)
+    {
+        if (lastRunningDevice.isEmpty())
+        {
+            // This method will only reload the last device that was running
+            // before closeAudioDevice() was called - you need to actually open
+            // one first, with setAudioDevice().
+            jassertfalse
+            return;
+        }
+
+        setAudioDevice (lastRunningDevice,
+                        lastRunningBlockSize,
+                        lastRunningSampleRate,
+                        &lastRunningIns,
+                        &lastRunningOuts,
+                        false);
+    }
+}
+
 void AudioDeviceManager::setInputChannels (const BitArray& newEnabledChannels,
                                            const bool treatAsChosenDevice)
 {

src/juce_appframework/audio/devices/juce_AudioDeviceManager.h

@@ -109,12 +109,12 @@ public:
                                             fails to open, then a default device will be used
                                             instead. If false, then on failure, no device is
                                             opened.
-        @param preferredDefaultDeviceName   if this is not empty, and there's a device with this 
+        @param preferredDefaultDeviceName   if this is not empty, and there's a device with this
                                             name, then that will be used as the default device
                                             (assuming that there wasn't one specified in the XML).
                                             The string can actually be a simple wildcard, containing "*"
                                             and "?" characters
-                                            
+
         @returns an error message if anything went wrong, or an empty string if it worked ok.
     */
     const String initialise (const int numInputChannelsNeeded,
@@ -195,6 +195,23 @@ public:
                                  const BitArray* outputChans,
                                  const bool treatAsChosenDevice);
 
+    /** Closes the currently-open device.
+
+        You can call restartLastAudioDevice() later to reopen it in the same state
+        that it was just in.
+    */
+    void closeAudioDevice();
+
+    /** Tries to reload the last audio device that was running.
+
+        Note that this only reloads the last device that was running before
+        closeAudioDevice() was called - it doesn't reload any kind of saved-state,
+        and can only be called after a device has been opened with SetAudioDevice().
+
+        If a device is already open, this call will do nothing.
+    */
+    void restartLastAudioDevice();
+
     /** Returns the name of the currently selected audio device.
 
         This will be an empty string if none is active.
@@ -384,6 +401,10 @@ private:
     };
 
     CallbackHandler callbackHandler;
+    String lastRunningDevice;
+    int lastRunningBlockSize;
+    double lastRunningSampleRate;
+    BitArray lastRunningIns, lastRunningOuts;
 
     friend class CallbackHandler;