Reduces default sample rate from 44.1kHz to 16kHz

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 81a2bddcd743d790810ddedfd7d1829a2a6ef30f..2bd840084dbb4a3c85b730f9fc76ab1598ea4edf 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
@@ -42,8 +42,11 @@ class WebRtcAudioManager {
   // Guaranteed to be supported by all devices.
   private static final int BITS_PER_SAMPLE = 16;
 
-   // Use 44.1kHz as the default sampling rate.
-  private static final int SAMPLE_RATE_HZ = 44100;
+  // Use 16kHz as the default sample rate. A higher sample rate might prevent
+  // us from supporting communication mode on some older (e.g. ICS) devices.
+  private static final int DEFAULT_SAMPLE_RATE_HZ = 16000;
+
+  private static final int DEFAULT_FRAME_PER_BUFFER = 256;
 
   // TODO(henrika): add stereo support for playout.
   private static final int CHANNELS = 1;
@@ -56,8 +59,6 @@ class WebRtcAudioManager {
       "MODE_IN_COMMUNICATION",
   };
 
-  private static final int DEFAULT_FRAME_PER_BUFFER = 256;
-
   private final long nativeAudioManager;
   private final Context context;
   private final AudioManager audioManager;
@@ -166,12 +167,12 @@ class WebRtcAudioManager {
       return 8000;
     }
     if (!WebRtcAudioUtils.runningOnJellyBeanMR1OrHigher()) {
-      return SAMPLE_RATE_HZ;
+      return DEFAULT_SAMPLE_RATE_HZ;
     }
     String sampleRateString = audioManager.getProperty(
         AudioManager.PROPERTY_OUTPUT_SAMPLE_RATE);
     return (sampleRateString == null) ?
-        SAMPLE_RATE_HZ : Integer.parseInt(sampleRateString);
+        DEFAULT_SAMPLE_RATE_HZ : Integer.parseInt(sampleRateString);
   }
 
   // Returns the native output buffer size for low-latency output streams.