Adds support for detection of pro-audio support on Android

webrtc/modules/audio_device/android/java/src/org/webrtc/voiceengine/WebRtcAudioManager.java

Index: webrtc/modules/audio_device/android/java/src/org/webrtc/voiceengine/WebRtcAudioManager.java
diff --git a/webrtc/modules/audio_device/android/java/src/org/webrtc/voiceengine/WebRtcAudioManager.java b/webrtc/modules/audio_device/android/java/src/org/webrtc/voiceengine/WebRtcAudioManager.java
index 1213f333d930778a8cba06d330b88afb9cf35b1a..497e234bf0700e5a13cd60b385fbe9ba11a23e16 100644
--- a/webrtc/modules/audio_device/android/java/src/org/webrtc/voiceengine/WebRtcAudioManager.java
+++ b/webrtc/modules/audio_device/android/java/src/org/webrtc/voiceengine/WebRtcAudioManager.java
@@ -81,6 +81,7 @@ public class WebRtcAudioManager {
   private boolean hardwareAGC;
   private boolean hardwareNS;
   private boolean lowLatencyOutput;
+  private boolean proAudio;
   private int sampleRate;
   private int channels;
   private int outputBufferSize;
@@ -98,7 +99,7 @@ public class WebRtcAudioManager {
     storeAudioParameters();
     nativeCacheAudioParameters(
         sampleRate, channels, hardwareAEC, hardwareAGC, hardwareNS,
-        lowLatencyOutput, outputBufferSize, inputBufferSize,
+        lowLatencyOutput, proAudio, outputBufferSize, inputBufferSize,
         nativeAudioManager);
   }
 
@@ -142,6 +143,7 @@ public class WebRtcAudioManager {
     hardwareAGC = isAutomaticGainControlSupported();
     hardwareNS = isNoiseSuppressorSupported();
     lowLatencyOutput = isLowLatencyOutputSupported();
+    proAudio = isProAudioSupported();
     outputBufferSize = lowLatencyOutput ?
         getLowLatencyOutputFramesPerBuffer() :
         getMinOutputFrameSize(sampleRate, channels);
@@ -168,8 +170,16 @@ public class WebRtcAudioManager {
     // as well. The NDK doc states that: "As of API level 21, lower latency
     // audio input is supported on select devices. To take advantage of this
     // feature, first confirm that lower latency output is available".
-    return WebRtcAudioUtils.runningOnLollipopOrHigher() &&
-        isLowLatencyOutputSupported();
+    return WebRtcAudioUtils.runningOnLollipopOrHigher()
+        && isLowLatencyOutputSupported();
+  }
+
+  // Returns true if the device has professional audio level of functionality
+  // and therefore supports the lowest possible round-trip latency.
+  private boolean isProAudioSupported() {
+    return WebRtcAudioUtils.runningOnMarshmallowOrHigher()
+        && context.getPackageManager().hasSystemFeature(
+            PackageManager.FEATURE_AUDIO_PRO);
   }
 
   // Returns the native output sample rate for this device's output stream.
@@ -287,6 +297,6 @@ public class WebRtcAudioManager {
 
   private native void nativeCacheAudioParameters(
     int sampleRate, int channels, boolean hardwareAEC, boolean hardwareAGC,
-    boolean hardwareNS, boolean lowLatencyOutput, int outputBufferSize,
-    int inputBufferSize, long nativeAudioManager);
+    boolean hardwareNS, boolean lowLatencyOutput, boolean proAudio,
+    int outputBufferSize, int inputBufferSize, long nativeAudioManager);
 }