Refactoring WebRTC Java/JNI audio track in C++ and Java.

This CL is part II in a major refactoring effort. See https://webrtc-codereview.appspot.com/33969004 for part I.

- Removes unused code and old WEBRTC logging macros
- Now uses optimal sample rate and buffer size in Java AudioTrack (used hard-coded sample rate before)
- Makes code more inline with the implementation in Chrome
- Adds helper methods for JNI handling to improve readability
- Changes the threading model (high-prio audio thread now lives in Java-land and C++ only works as proxy)
- Simplified the delay estimate
- Adds basic thread checks
- Removes all locks in C++ land
- Removes all locks in Java
- Improves construction/destruction
- Additional cleanup

Tested using AppRTCDemo and WebRTCDemo APKs on N6, N5, N7, Samsung Galaxy S4 and
Samsung Galaxy S4 mini (which uses 44.1kHz as native sample rate).

BUG=NONE
R=magjed@webrtc.org, perkj@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/39169004

Cr-Commit-Position: refs/heads/master@{#8460}
git-svn-id: http://webrtc.googlecode.com/svn/trunk@8460 4adac7df-926f-26a2-2b94-8c16560cd09d

1 files changed, 63 insertions, 0 deletions

diff --git a/webrtc/modules/audio_device/android/java/src/org/webrtc/voiceengine/WebRtcAudioUtils.java b/webrtc/modules/audio_device/android/java/src/org/webrtc/voiceengine/WebRtcAudioUtils.java
new file mode 100644
index 0000000000..6821726ee6
--- /dev/null
+++ b/webrtc/modules/audio_device/android/java/src/org/webrtc/voiceengine/WebRtcAudioUtils.java
@@ -0,0 +1,63 @@
+/*
+ *  Copyright (c) 2015 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+package org.webrtc.voiceengine;
+
+import java.lang.Thread;
+
+import android.media.AudioManager;
+import android.os.Build;
+import android.util.Log;
+
+public final class WebRtcAudioUtils {
+  // Use 44.1kHz as the default sampling rate.
+  private static final int SAMPLE_RATE_HZ = 44100;
+
+  public static boolean runningOnJellyBeanOrHigher() {
+    return Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN;
+  }
+
+  public static boolean runningOnJellyBeanMR1OrHigher() {
+    return Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN_MR1;
+  }
+
+  /** Helper method for building a string of thread information.*/
+  public static String getThreadInfo() {
+    return "@[name=" + Thread.currentThread().getName()
+        + ", id=" + Thread.currentThread().getId() + "]";
+  }
+
+  /** Information about the current build, taken from system properties. */
+  public static void logDeviceInfo(String tag) {
+    Log.d(tag, "Android SDK: " + Build.VERSION.SDK_INT + ", "
+        + "Release: " + Build.VERSION.RELEASE + ", "
+        + "Brand: " + Build.BRAND + ", "
+        + "Device: " + Build.DEVICE + ", "
+        + "Id: " + Build.ID + ", "
+        + "Hardware: " + Build.HARDWARE + ", "
+        + "Manufacturer: " + Build.MANUFACTURER + ", "
+        + "Model: " + Build.MODEL + ", "
+        + "Product: " + Build.PRODUCT);
+  }
+
+  /**
+   * Returns the native or optimal output sample rate for this device's
+   * primary output stream. Unit is in Hz.
+   */
+  public static int GetNativeSampleRate(AudioManager audioManager) {
+    if (!WebRtcAudioUtils.runningOnJellyBeanMR1OrHigher()) {
+      return SAMPLE_RATE_HZ;
+    }
+    String sampleRateString = audioManager.getProperty(
+        AudioManager.PROPERTY_OUTPUT_SAMPLE_RATE);
+    return (sampleRateString == null) ?
+        SAMPLE_RATE_HZ : Integer.parseInt(sampleRateString);
+  }
+}