APK for opensl loopback.

BUG=N/A
R=andrew@webrtc.org, fischman@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/2212004

git-svn-id: http://webrtc.googlecode.com/svn/trunk@4901 4adac7df-926f-26a2-2b94-8c16560cd09d

webrtc/modules/audio_device/android/audio_manager_jni.h

@@ -43,9 +43,9 @@ class AudioManagerJni {
   // SetAndroidAudioDeviceObjects.
   static void ClearAndroidAudioDeviceObjects();
 
-  bool low_latency_supported() { return low_latency_supported_; }
+  bool low_latency_supported() const { return low_latency_supported_; }
-  int native_output_sample_rate() { return native_output_sample_rate_; }
+  int native_output_sample_rate() const { return native_output_sample_rate_; }
-  int native_buffer_size() { return native_buffer_size_; }
+  int native_buffer_size() const { return native_buffer_size_; }
 
  private:
   bool HasDeviceObjects();

webrtc/modules/audio_device/android/opensles_common.h

@@ -17,7 +17,8 @@ namespace webrtc_opensl {
 
 enum {
   kDefaultSampleRate = 44100,
-  kNumChannels = 1
+  kNumChannels = 1,
+  kDefaultBufSizeInSamples = kDefaultSampleRate * 10 / 1000,
 };
 
 

webrtc/modules/audio_device/android/test/AndroidManifest.xml

@@ -0,0 +1,22 @@
+<?xml version="1.0" encoding="utf-8"?>
+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+      android:versionCode="1" package="org.webrtc.app" android:versionName="1.07">
+    <application android:icon="@drawable/logo"
+		 android:label="@string/app_name"
+		 android:debuggable="true">
+        <activity android:name=".OpenSlDemo"
+                  android:label="@string/app_name" 
+                  android:screenOrientation="landscape"
+                  >
+            <intent-filter>
+                <action android:name="android.intent.action.MAIN" />
+                <category android:name="android.intent.category.LAUNCHER" />
+                <action android:name="android.intent.action.HEADSET_PLUG"/>
+            </intent-filter>
+        </activity>
+    </application>
+
+    <uses-sdk android:minSdkVersion="14" />
+    <uses-permission android:name="android.permission.RECORD_AUDIO" />
+    <uses-permission android:name="android.permission.WAKE_LOCK" />
+</manifest> 

webrtc/modules/audio_device/android/test/README

@@ -0,0 +1,23 @@
+This directory contains an app for measuring the total delay from the native
+OpenSL implementation. Note that it just loops audio back from mic to speakers.
+
+Prerequisites:
+- Make sure gclient is checking out tools necessary to target Android: your
+  .gclient file should contain a line like:
+  target_os = ['android']
+  Make sure to re-run gclient sync after adding this to download the tools.
+- Env vars need to be set up to target Android; easiest way to do this is to run
+  (from the libjingle trunk directory):
+  . ./build/android/envsetup.sh
+  Note that this clobbers any previously-set $GYP_DEFINES so it must be done
+  before the next item.
+- Set up webrtc-related GYP variables:
+  export GYP_DEFINES="$GYP_DEFINES java_home=</path/to/JDK>
+                      enable_android_opensl=1"
+- Finally, run "gclient runhooks" to generate Android-targeting .ninja files.
+
+Example of building & using the app:
+
+cd <path/to/repository>/trunk
+ninja -C out/Debug OpenSlDemo
+adb install -r out/Debug/OpenSlDemo-debug.apk

webrtc/modules/audio_device/android/test/build.xml

@@ -0,0 +1,92 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project name="OpenSlDemo" default="help">
+
+    <!-- The local.properties file is created and updated by the 'android' tool.
+         It contains the path to the SDK. It should *NOT* be checked into
+         Version Control Systems. -->
+    <property file="local.properties" />
+
+    <!-- The ant.properties file can be created by you. It is only edited by the
+         'android' tool to add properties to it.
+         This is the place to change some Ant specific build properties.
+         Here are some properties you may want to change/update:
+
+         source.dir
+             The name of the source directory. Default is 'src'.
+         out.dir
+             The name of the output directory. Default is 'bin'.
+
+         For other overridable properties, look at the beginning of the rules
+         files in the SDK, at tools/ant/build.xml
+
+         Properties related to the SDK location or the project target should
+         be updated using the 'android' tool with the 'update' action.
+
+         This file is an integral part of the build system for your
+         application and should be checked into Version Control Systems.
+
+         -->
+    <property file="ant.properties" />
+
+    <!-- if sdk.dir was not set from one of the property file, then
+         get it from the ANDROID_SDK_ROOT env var.
+         This must be done before we load project.properties since
+         the proguard config can use sdk.dir -->
+    <property environment="env" />
+    <condition property="sdk.dir" value="${env.ANDROID_SDK_ROOT}">
+        <isset property="env.ANDROID_SDK_ROOT" />
+    </condition>
+
+    <!-- The project.properties file is created and updated by the 'android'
+         tool, as well as ADT.
+
+         This contains project specific properties such as project target, and library
+         dependencies. Lower level build properties are stored in ant.properties
+         (or in .classpath for Eclipse projects).
+
+         This file is an integral part of the build system for your
+         application and should be checked into Version Control Systems. -->
+    <loadproperties srcFile="project.properties" />
+
+    <!-- quick check on sdk.dir -->
+    <fail
+            message="sdk.dir is missing. Make sure to generate local.properties using 'android update project' or to inject it through the ANDROID_SDK_ROOT environment variable."
+            unless="sdk.dir"
+    />
+
+    <!--
+        Import per project custom build rules if present at the root of the project.
+        This is the place to put custom intermediary targets such as:
+            -pre-build
+            -pre-compile
+            -post-compile (This is typically used for code obfuscation.
+                           Compiled code location: ${out.classes.absolute.dir}
+                           If this is not done in place, override ${out.dex.input.absolute.dir})
+            -post-package
+            -post-build
+            -pre-clean
+    -->
+    <import file="custom_rules.xml" optional="true" />
+
+    <!-- Import the actual build file.
+
+         To customize existing targets, there are two options:
+         - Customize only one target:
+             - copy/paste the target into this file, *before* the
+               <import> task.
+             - customize it to your needs.
+         - Customize the whole content of build.xml
+             - copy/paste the content of the rules files (minus the top node)
+               into this file, replacing the <import> task.
+             - customize to your needs.
+
+         ***********************
+         ****** IMPORTANT ******
+         ***********************
+         In all cases you must update the value of version-tag below to read 'custom' instead of an integer,
+         in order to avoid having your file be overridden by tools such as "android update project"
+    -->
+    <!-- version-tag: 1 -->
+    <import file="${sdk.dir}/tools/ant/build.xml" />
+
+</project>

webrtc/modules/audio_device/android/test/fake_audio_device_buffer.cc

@@ -0,0 +1,109 @@
+/*
+ *  Copyright (c) 2013 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.
+ */
+
+#include "webrtc/modules/audio_device/android/test/fake_audio_device_buffer.h"
+
+#include <assert.h>
+
+#include "webrtc/modules/audio_device/android/opensles_common.h"
+
+using webrtc_opensl::kDefaultBufSizeInSamples;
+
+namespace webrtc {
+
+FakeAudioDeviceBuffer::FakeAudioDeviceBuffer()
+    : fifo_(kNumBuffers),
+      next_available_buffer_(0),
+      record_channels_(0),
+      play_channels_(0) {
+  buf_.reset(new scoped_array<int8_t>[kNumBuffers]);
+  for (int i = 0; i < kNumBuffers; ++i) {
+    buf_[i].reset(new int8_t[buffer_size_bytes()]);
+  }
+}
+
+int32_t FakeAudioDeviceBuffer::SetRecordingSampleRate(uint32_t fsHz) {
+  assert(static_cast<int>(fsHz) == sample_rate());
+  return 0;
+}
+
+int32_t FakeAudioDeviceBuffer::SetPlayoutSampleRate(uint32_t fsHz) {
+  assert(static_cast<int>(fsHz) == sample_rate());
+  return 0;
+}
+
+int32_t FakeAudioDeviceBuffer::SetRecordingChannels(uint8_t channels) {
+  assert(channels > 0);
+  record_channels_ = channels;
+  assert((play_channels_ == 0) ||
+         (record_channels_ == play_channels_));
+  return 0;
+}
+
+int32_t FakeAudioDeviceBuffer::SetPlayoutChannels(uint8_t channels) {
+  assert(channels > 0);
+  play_channels_ = channels;
+  assert((record_channels_ == 0) ||
+         (record_channels_ == play_channels_));
+  return 0;
+}
+
+int32_t FakeAudioDeviceBuffer::SetRecordedBuffer(const void* audioBuffer,
+                                                 uint32_t nSamples) {
+  assert(audioBuffer);
+  assert(fifo_.size() < fifo_.capacity());
+  assert(nSamples == kDefaultBufSizeInSamples);
+  int8_t* buffer = buf_[next_available_buffer_].get();
+  next_available_buffer_ = (next_available_buffer_ + 1) % kNumBuffers;
+  memcpy(buffer, audioBuffer, nSamples * sizeof(int16_t));
+  fifo_.Push(buffer);
+  return 0;
+}
+
+int32_t FakeAudioDeviceBuffer::RequestPlayoutData(uint32_t nSamples) {
+  assert(nSamples == kDefaultBufSizeInSamples);
+  return 0;
+}
+
+int32_t FakeAudioDeviceBuffer::GetPlayoutData(void* audioBuffer) {
+  assert(audioBuffer);
+  if (fifo_.size() < 1) {
+    // Playout silence until there is data available.
+    memset(audioBuffer, 0, buffer_size_bytes());
+    return buffer_size_samples();
+  }
+  int8_t* buffer = fifo_.Pop();
+  memcpy(audioBuffer, buffer, buffer_size_bytes());
+  return buffer_size_samples();
+}
+
+int FakeAudioDeviceBuffer::sample_rate() const {
+  return audio_manager_.low_latency_supported() ?
+      audio_manager_.native_output_sample_rate() :
+      webrtc_opensl::kDefaultSampleRate;
+}
+
+int FakeAudioDeviceBuffer::buffer_size_samples() const {
+  return sample_rate() * 10 / 1000;
+}
+
+int FakeAudioDeviceBuffer::buffer_size_bytes() const {
+  return buffer_size_samples() * webrtc_opensl::kNumChannels * sizeof(int16_t);
+}
+
+
+void FakeAudioDeviceBuffer::ClearBuffer() {
+  while (fifo_.size() != 0) {
+    fifo_.Pop();
+  }
+  next_available_buffer_ = 0;
+}
+
+}  // namespace webrtc

webrtc/modules/audio_device/android/test/fake_audio_device_buffer.h

@@ -0,0 +1,67 @@
+/*
+ *  Copyright (c) 2013 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.
+ */
+
+#ifndef WEBRTC_MODULES_AUDIO_DEVICE_ANDROID_FAKE_AUDIO_DEVICE_BUFFER_H_
+#define WEBRTC_MODULES_AUDIO_DEVICE_ANDROID_FAKE_AUDIO_DEVICE_BUFFER_H_
+
+#include "webrtc/modules/audio_device/android/audio_manager_jni.h"
+#include "webrtc/modules/audio_device/android/single_rw_fifo.h"
+#include "webrtc/modules/audio_device/audio_device_buffer.h"
+#include "webrtc/system_wrappers/interface/scoped_ptr.h"
+
+namespace webrtc {
+
+// Fake AudioDeviceBuffer implementation that returns audio data that is pushed
+// to it. It implements all APIs used by the OpenSL implementation.
+class FakeAudioDeviceBuffer : public AudioDeviceBuffer {
+ public:
+  FakeAudioDeviceBuffer();
+  virtual ~FakeAudioDeviceBuffer() {}
+
+  virtual int32_t SetRecordingSampleRate(uint32_t fsHz);
+  virtual int32_t SetPlayoutSampleRate(uint32_t fsHz);
+  virtual int32_t SetRecordingChannels(uint8_t channels);
+  virtual int32_t SetPlayoutChannels(uint8_t channels);
+  virtual int32_t SetRecordedBuffer(const void* audioBuffer,
+                                    uint32_t nSamples);
+  virtual void SetVQEData(int playDelayMS,
+                          int recDelayMS,
+                          int clockDrift) {}
+  virtual int32_t DeliverRecordedData() { return 0; }
+  virtual int32_t RequestPlayoutData(uint32_t nSamples);
+  virtual int32_t GetPlayoutData(void* audioBuffer);
+
+  void ClearBuffer();
+
+ private:
+  enum {
+    // Each buffer contains 10 ms of data since that is what OpenSlesInput
+    // delivers. Keep 7 buffers which would cover 70 ms of data. These buffers
+    // are needed because of jitter between OpenSl recording and playing.
+    kNumBuffers = 7,
+  };
+  int sample_rate() const;
+  int buffer_size_samples() const;
+  int buffer_size_bytes() const;
+
+  // Java API handle
+  AudioManagerJni audio_manager_;
+
+  SingleRwFifo fifo_;
+  scoped_array<scoped_array<int8_t> > buf_;
+  int next_available_buffer_;
+
+  uint8_t record_channels_;
+  uint8_t play_channels_;
+};
+
+}  // namespace webrtc
+
+#endif  // WEBRTC_MODULES_AUDIO_DEVICE_ANDROID_FAKE_AUDIO_DEVICE_BUFFER_H_

webrtc/modules/audio_device/android/test/jni/opensl_runner.cc

@@ -0,0 +1,104 @@
+/*
+ *  Copyright (c) 2013 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.
+ */
+
+#include "webrtc/modules/audio_device/android/test/jni/opensl_runner.h"
+
+#include <assert.h>
+
+#include "webrtc/modules/audio_device/android/audio_manager_jni.h"
+
+// Java globals
+static JavaVM* g_vm = NULL;
+static jclass g_osr = NULL;
+
+// Global class implementing native code.
+static webrtc::OpenSlRunner* g_runner = NULL;
+
+jint JNI_OnLoad(JavaVM* vm, void* reserved) {
+  // Only called once.
+  assert(!g_vm);
+  JNIEnv* env;
+  if (vm->GetEnv(reinterpret_cast<void**>(&env), JNI_VERSION_1_6) != JNI_OK) {
+    return -1;
+  }
+
+  jclass local_osr = env->FindClass("org/webrtc/app/OpenSlRunner");
+  assert(local_osr != NULL);
+  g_osr = static_cast<jclass>(env->NewGlobalRef(local_osr));
+  JNINativeMethod nativeFunctions[] = {
+    {"RegisterApplicationContext", "(Landroid/content/Context;)V",
+     reinterpret_cast<void*>(
+         &webrtc::OpenSlRunner::RegisterApplicationContext)},
+    {"Start", "()V", reinterpret_cast<void*>(&webrtc::OpenSlRunner::Start)},
+    {"Stop",  "()V", reinterpret_cast<void*>(&webrtc::OpenSlRunner::Stop)}
+  };
+  int ret_val = env->RegisterNatives(g_osr, nativeFunctions, 3);
+  if (ret_val != 0) {
+    assert(false);
+  }
+  g_vm = vm;
+  return JNI_VERSION_1_6;
+}
+
+namespace webrtc {
+
+OpenSlRunner::OpenSlRunner()
+  : output_(0),
+    input_(0, &output_) {
+  output_.AttachAudioBuffer(&audio_buffer_);
+  if (output_.Init() != 0) {
+    assert(false);
+  }
+  if (output_.InitPlayout() != 0) {
+    assert(false);
+  }
+  input_.AttachAudioBuffer(&audio_buffer_);
+  if (input_.Init() != 0) {
+    assert(false);
+  }
+  if (input_.InitRecording() != 0) {
+    assert(false);
+  }
+}
+
+void OpenSlRunner::StartPlayRecord() {
+  output_.StartPlayout();
+  input_.StartRecording();
+}
+
+void OpenSlRunner::StopPlayRecord() {
+  // There are large enough buffers to compensate for recording and playing
+  // jitter such that the timing of stopping playing or recording should not
+  // result in over or underrun.
+  input_.StopRecording();
+  output_.StopPlayout();
+  audio_buffer_.ClearBuffer();
+}
+
+JNIEXPORT void JNICALL OpenSlRunner::RegisterApplicationContext(
+    JNIEnv * env,
+    jobject,
+    jobject context) {
+  assert(!g_runner);  // Should only be called once.
+  AudioManagerJni::SetAndroidAudioDeviceObjects(g_vm, env, context);
+  // Might as well create the global instance since everything is set up at this
+  // point.
+  g_runner = new webrtc::OpenSlRunner();
+}
+
+JNIEXPORT void JNICALL OpenSlRunner::Start(JNIEnv * env, jobject) {
+  g_runner->StartPlayRecord();
+}
+
+JNIEXPORT void JNICALL OpenSlRunner::Stop(JNIEnv * env, jobject) {
+  g_runner->StopPlayRecord();
+}
+
+}  // namespace webrtc

webrtc/modules/audio_device/android/test/jni/opensl_runner.h

@@ -0,0 +1,47 @@
+/*
+ *  Copyright (c) 2013 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.
+ */
+
+#include <jni.h>
+
+#include "webrtc/modules/audio_device/android/test/fake_audio_device_buffer.h"
+#include "webrtc/modules/audio_device/android/opensles_input.h"
+#include "webrtc/modules/audio_device/android/opensles_output.h"
+#include "webrtc/system_wrappers/interface/scoped_ptr.h"
+
+#ifndef WEBRTC_MODULES_AUDIO_DEVICE_ANDROID_JNI_OPENSL_RUNNER_H_
+#define WEBRTC_MODULES_AUDIO_DEVICE_ANDROID_JNI_OPENSL_RUNNER_H_
+
+namespace webrtc {
+
+class FakeAudioDeviceBuffer;
+
+class OpenSlRunner {
+ public:
+  OpenSlRunner();
+  ~OpenSlRunner() {}
+
+  void StartPlayRecord();
+  void StopPlayRecord();
+
+  static JNIEXPORT void JNICALL RegisterApplicationContext(JNIEnv * env,
+                                                           jobject,
+                                                           jobject context);
+  static JNIEXPORT void JNICALL Start(JNIEnv * env, jobject);
+  static JNIEXPORT void JNICALL Stop(JNIEnv * env, jobject);
+
+ private:
+  OpenSlesOutput output_;
+  OpenSlesInput input_;
+  FakeAudioDeviceBuffer audio_buffer_;
+};
+
+}  // namespace webrtc
+
+#endif  // WEBRTC_MODULES_AUDIO_DEVICE_ANDROID_JNI_OPENSL_RUNNER_H_

webrtc/modules/audio_device/android/test/project.properties

@@ -0,0 +1,14 @@
+# This file is automatically generated by Android Tools.
+# Do not modify this file -- YOUR CHANGES WILL BE ERASED!
+#
+# This file must be checked in Version Control Systems.
+#
+# To customize properties used by the Ant build system edit
+# "ant.properties", and override values to adapt the script to your
+# project structure.
+#
+# To enable ProGuard to shrink and obfuscate your code, uncomment this (available properties: sdk.dir, user.home):
+#proguard.config=${sdk.dir}/tools/proguard/proguard-android.txt:proguard-project.txt
+
+# Project target.
+target=android-17

webrtc/modules/audio_device/android/test/res/layout/open_sl_demo.xml

@@ -0,0 +1,22 @@
+<?xml version="1.0" encoding="utf-8"?>
+<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+	      android:orientation="vertical"
+	      android:layout_width="fill_parent"
+	      android:layout_height="fill_parent"
+	      android:gravity="bottom">
+    <TextView android:layout_width="fill_parent"
+	      android:layout_height="fill_parent"
+	      android:layout_weight="1"
+	      android:layout_gravity="top"
+	      android:text="About: This application, when started, loops back audio as quickly as the native OpenSL implementation allows. Just starting it will lead to a feedback loop. It can be used to measure delay with the proper hardware. Using it as is has little utility." />
+    <Button android:id="@+id/btStartStopCall"
+	    android:layout_width="100dip"
+	    android:layout_height="wrap_content"
+	    android:text="@string/startCall"
+	    android:layout_gravity="center"/>
+    <Button android:id="@+id/btExit"
+	    android:layout_width="100dip"
+	    android:layout_height="wrap_content"
+	    android:layout_gravity="center"
+	    android:text="@string/exit"/>
+</LinearLayout >

webrtc/modules/audio_device/android/test/res/values/strings.xml

@@ -0,0 +1,7 @@
+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+  <string name="app_name">WebRTCOpenSLLoopback</string>
+  <string name="startCall">StartCall</string>
+  <string name="stopCall">StopCall</string>
+  <string name="exit">Exit</string>
+</resources>

webrtc/modules/audio_device/android/test/src/org/webrtc/app/OpenSlDemo.java

@@ -0,0 +1,91 @@
+/*
+ *  Copyright (c) 2013 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.app;
+
+import android.app.Activity;
+import android.content.Context;
+import android.content.pm.ActivityInfo;
+import android.media.AudioManager;
+import android.os.Bundle;
+import android.os.PowerManager;
+import android.os.PowerManager.WakeLock;
+import android.util.Log;
+import android.view.View;
+import android.widget.Button;
+
+public class OpenSlDemo extends Activity implements View.OnClickListener {
+  private static final String TAG = "WEBRTC";
+
+  private Button btStartStopCall;
+  private boolean isRunning = false;
+
+  private WakeLock wakeLock;
+
+  private OpenSlRunner runner;
+
+  // Called when activity is created.
+  @Override
+  public void onCreate(Bundle savedInstanceState) {
+    super.onCreate(savedInstanceState);
+
+    PowerManager pm = (PowerManager)this.getSystemService(
+        Context.POWER_SERVICE);
+    wakeLock = pm.newWakeLock(
+        PowerManager.SCREEN_DIM_WAKE_LOCK, TAG);
+    wakeLock.acquire(); // Keep screen on until app terminates.
+
+    setContentView(R.layout.open_sl_demo);
+
+    // Direct hardware volume controls to affect the voice call audio stream.
+    setVolumeControlStream(AudioManager.STREAM_VOICE_CALL);
+
+    btStartStopCall = (Button) findViewById(R.id.btStartStopCall);
+    btStartStopCall.setOnClickListener(this);
+    findViewById(R.id.btExit).setOnClickListener(this);
+
+    runner = new OpenSlRunner();
+    // Native code calls back into JVM to be able to configure OpenSL to low
+    // latency mode. Provide the context needed to do this.
+    runner.RegisterApplicationContext(getApplicationContext());
+  }
+
+  // Called before activity is destroyed.
+  @Override
+  public void onDestroy() {
+    Log.d(TAG, "onDestroy");
+    wakeLock.release();
+    super.onDestroy();
+  }
+
+  private void startOrStop() {
+    if (isRunning) {
+      runner.Stop();
+      btStartStopCall.setText(R.string.startCall);
+      isRunning = false;
+    } else if (!isRunning){
+      runner.Start();
+      btStartStopCall.setText(R.string.stopCall);
+      isRunning = true;
+    }
+  }
+
+  public void onClick(View arg0) {
+    switch (arg0.getId()) {
+      case R.id.btStartStopCall:
+        startOrStop();
+        break;
+      case R.id.btExit:
+        finish();
+        break;
+    }
+  }
+
+}

webrtc/modules/audio_device/android/test/src/org/webrtc/app/OpenSlRunner.java

@@ -0,0 +1,24 @@
+/*
+ *  Copyright (c) 2013 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.app;
+
+import android.content.Context;
+
+public class OpenSlRunner {
+  public OpenSlRunner() {
+    System.loadLibrary("opensl-demo-jni");
+  }
+
+  public static native void RegisterApplicationContext(Context context);
+  public static native void Start();
+  public static native void Stop();
+
+}

webrtc/modules/audio_device/audio_device.gypi

@@ -253,6 +253,66 @@
             },
           ],
         }],
+        ['OS=="android" and enable_android_opensl==1', {
+          'targets': [
+            {
+              'target_name': 'libopensl-demo-jni',
+              'type': 'loadable_module',
+              'dependencies': [
+                'audio_device',
+              ],
+              'sources': [
+                'android/test/jni/opensl_runner.cc',
+                'android/test/fake_audio_device_buffer.cc',
+              ],
+              'link_settings': {
+                'libraries': [
+                  '-llog',
+                  '-lOpenSLES',
+                ],
+              },
+            },
+            {
+              'target_name': 'OpenSlDemo',
+              'type': 'none',
+              'dependencies': [
+                'libopensl-demo-jni',
+                '<(modules_java_gyp_path):*',
+              ],
+              'actions': [
+                {
+                  # TODO(henrik): Convert building of the demo to a proper GYP
+                  # target so this action is not needed once chromium's
+                  # apk-building machinery can be used. (crbug.com/225101)
+                  'action_name': 'build_opensldemo_apk',
+                  'variables': {
+                    'android_opensl_demo_root': '<(webrtc_root)/modules/audio_device/android/test',
+                  },
+                  'inputs' : [
+                    '<(PRODUCT_DIR)/lib.java/audio_device_module_java.jar',
+                    '<(PRODUCT_DIR)/libopensl-demo-jni.so',
+                    '<!@(find <(android_opensl_demo_root)/src -name "*.java")',
+                    '<!@(find <(android_opensl_demo_root)/res -name "*.xml")',
+                    '<!@(find <(android_opensl_demo_root)/res -name "*.png")',
+                    '<(android_opensl_demo_root)/AndroidManifest.xml',
+                    '<(android_opensl_demo_root)/build.xml',
+                    '<(android_opensl_demo_root)/project.properties',
+                  ],
+                  'outputs': ['<(PRODUCT_DIR)/OpenSlDemo-debug.apk'],
+                  'action': ['bash', '-ec',
+                             'rm -f <(_outputs) && '
+                             'mkdir -p <(android_opensl_demo_root)/libs/<(android_app_abi) && '
+                             '<(android_strip) -o <(android_opensl_demo_root)/libs/<(android_app_abi)/libopensl-demo-jni.so <(PRODUCT_DIR)/libopensl-demo-jni.so && '
+                             'cp <(PRODUCT_DIR)/lib.java/audio_device_module_java.jar <(android_opensl_demo_root)/libs/ &&'
+                             'cd <(android_opensl_demo_root) && '
+                             'ant debug && '
+                             'cd - && '
+                             'cp <(android_opensl_demo_root)/bin/OpenSlDemo-debug.apk <(_outputs)'
+                           ],
+                },
+              ],
+            }],
+          }],
         ['OS=="android" and enable_android_opensl==1', {
           'targets': [
             {

webrtc/modules/audio_device/audio_device_buffer.h

@@ -36,13 +36,13 @@ public:
     int32_t InitPlayout();
     int32_t InitRecording();
 
-    int32_t SetRecordingSampleRate(uint32_t fsHz);
+    virtual int32_t SetRecordingSampleRate(uint32_t fsHz);
-    int32_t SetPlayoutSampleRate(uint32_t fsHz);
+    virtual int32_t SetPlayoutSampleRate(uint32_t fsHz);
     int32_t RecordingSampleRate() const;
     int32_t PlayoutSampleRate() const;
 
-    int32_t SetRecordingChannels(uint8_t channels);
+    virtual int32_t SetRecordingChannels(uint8_t channels);
-    int32_t SetPlayoutChannels(uint8_t channels);
+    virtual int32_t SetPlayoutChannels(uint8_t channels);
     uint8_t RecordingChannels() const;
     uint8_t PlayoutChannels() const;
     int32_t SetRecordingChannel(
@@ -50,12 +50,13 @@ public:
     int32_t RecordingChannel(
         AudioDeviceModule::ChannelType& channel) const;
 
-    int32_t SetRecordedBuffer(const void* audioBuffer, uint32_t nSamples);
+    virtual int32_t SetRecordedBuffer(const void* audioBuffer,
+                                      uint32_t nSamples);
     int32_t SetCurrentMicLevel(uint32_t level);
-    void SetVQEData(int playDelayMS,
+    virtual void SetVQEData(int playDelayMS,
-                    int recDelayMS,
+                            int recDelayMS,
-                    int clockDrift);
+                            int clockDrift);
-    int32_t DeliverRecordedData();
+    virtual int32_t DeliverRecordedData();
     uint32_t NewMicLevel() const;
 
     virtual int32_t RequestPlayoutData(uint32_t nSamples);