Android: Added a JUCE_USE_ANDROID_OBOE_STABILIZED_CALLBACK config flag to juce_audio_devices to enable the use of oboe::StabilizedCallback

modules/juce_audio_devices/juce_audio_devices.h

@@ -143,6 +143,15 @@
  #define JUCE_USE_ANDROID_OBOE 0
 #endif
 
+/** Config: JUCE_USE_OBOE_STABILIZED_CALLBACK
+    If JUCE_USE_ANDROID_OBOE is enabled, enabling this will wrap output audio
+    streams in the oboe::StabilizedCallback class. This class attempts to keep
+    the CPU spinning to avoid it being scaled down on certain devices.
+*/
+#ifndef JUCE_USE_ANDROID_OBOE_STABILIZED_CALLBACK
+ #define JUCE_USE_ANDROID_OBOE_STABILIZED_CALLBACK 0
+#endif
+
 /** Config: JUCE_USE_ANDROID_OPENSLES
     Enables OpenSLES devices (Android only).
 */

modules/juce_audio_devices/native/juce_android_Oboe.cpp

@@ -513,7 +513,16 @@ private:
             builder.setFormat (format);
             builder.setSampleRate (newSampleRate);
             builder.setPerformanceMode (oboe::PerformanceMode::LowLatency);
+
+           #if JUCE_USE_ANDROID_OBOE_STABILIZED_CALLBACK
+            if (newCallback != nullptr)
+            {
+                stabilizedCallback = std::make_unique<oboe::StabilizedCallback> (newCallback);
+                builder.setCallback (stabilizedCallback.get());
+            }
+           #else
             builder.setCallback (newCallback);
+           #endif
 
             JUCE_OBOE_LOG (String ("Preparing Oboe stream with params:")
                  + "\nAAudio supported = " + String (int (builder.isAAudioSupported()))
@@ -564,6 +573,9 @@ private:
         }
 
         oboe::AudioStream* stream = nullptr;
+       #if JUCE_USE_ANDROID_OBOE_STABILIZED_CALLBACK
+        std::unique_ptr<oboe::StabilizedCallback> stabilizedCallback;
+       #endif
         oboe::Result openResult;
     };