Move android audio device code into sdk/android

This CL adds a stand-alone Android AudioDeviceModule in the
sdk/android folder. It's forked from modules/audio_device/android/
and then simplified for the Android case. The stand-alone Android
ADM is available both in the native_api and also under a field trial
in the Java API.

Bug: webrtc:7452
Change-Id: If6e558026bd0ccb52f56d78ac833339a5789d300
Reviewed-on: https://webrtc-review.googlesource.com/60541
Commit-Queue: Magnus Jedvert <magjed@webrtc.org>
Reviewed-by: Magnus Jedvert <magjed@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#22517}

sdk/android/api/org/webrtc/audio/AudioDeviceModule.java

@@ -0,0 +1,97 @@
+/*
+ *  Copyright 2018 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.audio;
+
+import org.webrtc.audio.WebRtcAudioManager;
+import org.webrtc.audio.WebRtcAudioRecord;
+import org.webrtc.audio.WebRtcAudioTrack;
+import org.webrtc.audio.WebRtcAudioUtils;
+
+/**
+ * Public API for Java audio methods.
+ *
+ * <p>Note: This class is still under development and may change without notice.
+ */
+public class AudioDeviceModule {
+  public AudioDeviceModule() {}
+
+  /* AudioManager */
+  public static void setBlacklistDeviceForOpenSLESUsage(boolean enable) {
+    WebRtcAudioManager.setBlacklistDeviceForOpenSLESUsage(enable);
+  }
+
+  public static void setStereoInput(boolean enable) {
+    WebRtcAudioManager.setStereoInput(enable);
+  }
+
+  /* AudioRecord */
+  // Audio recording error handler functions.
+  public enum AudioRecordStartErrorCode {
+    AUDIO_RECORD_START_EXCEPTION,
+    AUDIO_RECORD_START_STATE_MISMATCH,
+  }
+
+  public static interface AudioRecordErrorCallback {
+    void onWebRtcAudioRecordInitError(String errorMessage);
+    void onWebRtcAudioRecordStartError(AudioRecordStartErrorCode errorCode, String errorMessage);
+    void onWebRtcAudioRecordError(String errorMessage);
+  }
+
+  public static void setErrorCallback(AudioRecordErrorCallback errorCallback) {
+    WebRtcAudioRecord.setErrorCallback(errorCallback);
+  }
+
+  /* AudioTrack */
+  // Audio playout/track error handler functions.
+  public enum AudioTrackStartErrorCode {
+    AUDIO_TRACK_START_EXCEPTION,
+    AUDIO_TRACK_START_STATE_MISMATCH,
+  }
+  public static interface AudioTrackErrorCallback {
+    void onWebRtcAudioTrackInitError(String errorMessage);
+    void onWebRtcAudioTrackStartError(AudioTrackStartErrorCode errorCode, String errorMessage);
+    void onWebRtcAudioTrackError(String errorMessage);
+  }
+
+  public static void setErrorCallback(AudioTrackErrorCallback errorCallback) {
+    WebRtcAudioTrack.setErrorCallback(errorCallback);
+  }
+
+  /* AudioUtils */
+  public static void setWebRtcBasedAcousticEchoCanceler(boolean enable) {
+    WebRtcAudioUtils.setWebRtcBasedAcousticEchoCanceler(enable);
+  }
+
+  public static void setWebRtcBasedNoiseSuppressor(boolean enable) {
+    WebRtcAudioUtils.setWebRtcBasedNoiseSuppressor(enable);
+  }
+
+  // Returns true if the device supports an audio effect (AEC or NS).
+  // Four conditions must be fulfilled if functions are to return true:
+  // 1) the platform must support the built-in (HW) effect,
+  // 2) explicit use (override) of a WebRTC based version must not be set,
+  // 3) the device must not be blacklisted for use of the effect, and
+  // 4) the UUID of the effect must be approved (some UUIDs can be excluded).
+  public static boolean isAcousticEchoCancelerSupported() {
+    return WebRtcAudioEffects.canUseAcousticEchoCanceler();
+  }
+  public static boolean isNoiseSuppressorSupported() {
+    return WebRtcAudioEffects.canUseNoiseSuppressor();
+  }
+
+  // Call this method if the default handling of querying the native sample
+  // rate shall be overridden. Can be useful on some devices where the
+  // available Android APIs are known to return invalid results.
+  // TODO(bugs.webrtc.org/8491): Remove NoSynchronizedMethodCheck suppression.
+  public static void setDefaultSampleRateHz(int sampleRateHz) {
+    WebRtcAudioUtils.setDefaultSampleRateHz(sampleRateHz);
+  }
+}