Revert of Combine webrtc/api/java/android and webrtc/api/java/src.

webrtc/api/android/jni/peerconnection_jni.cc

-/*
- *  Copyright 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.
- */
-
-// Hints for future visitors:
-// This entire file is an implementation detail of the org.webrtc Java package,
-// the most interesting bits of which are org.webrtc.PeerConnection{,Factory}.
-// The layout of this file is roughly:
-// - various helper C++ functions & classes that wrap Java counterparts and
-//   expose a C++ interface that can be passed to the C++ PeerConnection APIs
-// - implementations of methods declared "static" in the Java package (named
-//   things like Java_org_webrtc_OMG_Can_This_Name_Be_Any_Longer, prescribed by
-//   the JNI spec).
-//
-// Lifecycle notes: objects are owned where they will be called; in other words
-// FooObservers are owned by C++-land, and user-callable objects (e.g.
-// PeerConnection and VideoTrack) are owned by Java-land.
-// When this file allocates C++ RefCountInterfaces it AddRef()s an artificial
-// ref simulating the jlong held in Java-land, and then Release()s the ref in
-// the respective free call.  Sometimes this AddRef is implicit in the
-// construction of a scoped_refptr<> which is then .release()d.
-// Any persistent (non-local) references from C++ to Java must be global or weak
-// (in which case they must be checked before use)!
-//
-// Exception notes: pretty much all JNI calls can throw Java exceptions, so each
-// call through a JNIEnv* pointer needs to be followed by an ExceptionCheck()
-// call.  In this file this is done in CHECK_EXCEPTION, making for much easier
-// debugging in case of failure (the alternative is to wait for control to
-// return to the Java frame that called code in this file, at which point it's
-// impossible to tell which JNI call broke).
-
-#include <jni.h>
-#undef JNIEXPORT
-#define JNIEXPORT __attribute__((visibility("default")))
-
-#include <limits>
-#include <memory>
-#include <utility>
-
-#include "webrtc/api/androidvideocapturer.h"
-#include "webrtc/api/dtlsidentitystore.h"
-#include "webrtc/api/android/jni/androidmediadecoder_jni.h"
-#include "webrtc/api/android/jni/androidmediaencoder_jni.h"
-#include "webrtc/api/android/jni/androidnetworkmonitor_jni.h"
-#include "webrtc/api/android/jni/androidvideocapturer_jni.h"
-#include "webrtc/api/android/jni/classreferenceholder.h"
-#include "webrtc/api/android/jni/jni_helpers.h"
-#include "webrtc/api/android/jni/native_handle_impl.h"
-#include "webrtc/api/mediaconstraintsinterface.h"
-#include "webrtc/api/peerconnectioninterface.h"
-#include "webrtc/api/rtpreceiverinterface.h"
-#include "webrtc/api/rtpsenderinterface.h"
-#include "webrtc/api/webrtcsdp.h"
-#include "webrtc/base/bind.h"
-#include "webrtc/base/checks.h"
-#include "webrtc/base/event_tracer.h"
-#include "webrtc/base/logging.h"
-#include "webrtc/base/logsinks.h"
-#include "webrtc/base/messagequeue.h"
-#include "webrtc/base/networkmonitor.h"
-#include "webrtc/base/rtccertificategenerator.h"
-#include "webrtc/base/ssladapter.h"
-#include "webrtc/base/stringutils.h"
-#include "webrtc/media/base/videocapturer.h"
-#include "webrtc/media/engine/webrtcvideodecoderfactory.h"
-#include "webrtc/media/engine/webrtcvideoencoderfactory.h"
-#include "webrtc/system_wrappers/include/field_trial_default.h"
-#include "webrtc/system_wrappers/include/logcat_trace_context.h"
-#include "webrtc/system_wrappers/include/trace.h"
-#include "webrtc/voice_engine/include/voe_base.h"
-
-using cricket::WebRtcVideoDecoderFactory;
-using cricket::WebRtcVideoEncoderFactory;
-using rtc::Bind;
-using rtc::Thread;
-using rtc::ThreadManager;
-using webrtc::AudioSourceInterface;
-using webrtc::AudioTrackInterface;
-using webrtc::AudioTrackVector;
-using webrtc::CreateSessionDescriptionObserver;
-using webrtc::DataBuffer;
-using webrtc::DataChannelInit;
-using webrtc::DataChannelInterface;
-using webrtc::DataChannelObserver;
-using webrtc::IceCandidateInterface;
-using webrtc::LogcatTraceContext;
-using webrtc::MediaConstraintsInterface;
-using webrtc::MediaSourceInterface;
-using webrtc::MediaStreamInterface;
-using webrtc::MediaStreamTrackInterface;
-using webrtc::PeerConnectionFactoryInterface;
-using webrtc::PeerConnectionInterface;
-using webrtc::PeerConnectionObserver;
-using webrtc::RtpReceiverInterface;
-using webrtc::RtpSenderInterface;
-using webrtc::SessionDescriptionInterface;
-using webrtc::SetSessionDescriptionObserver;
-using webrtc::StatsObserver;
-using webrtc::StatsReport;
-using webrtc::StatsReports;
-using webrtc::VideoTrackSourceInterface;
-using webrtc::VideoTrackInterface;
-using webrtc::VideoTrackVector;
-using webrtc::kVideoCodecVP8;
-
-namespace webrtc_jni {
-
-// Field trials initialization string
-static char *field_trials_init_string = NULL;
-
-// Set in PeerConnectionFactory_initializeAndroidGlobals().
-static bool factory_static_initialized = false;
-static bool video_hw_acceleration_enabled = true;
-
-// Return the (singleton) Java Enum object corresponding to |index|;
-// |state_class_fragment| is something like "MediaSource$State".
-static jobject JavaEnumFromIndex(
-    JNIEnv* jni, const std::string& state_class_fragment, int index) {
-  const std::string state_class = "org/webrtc/" + state_class_fragment;
-  return JavaEnumFromIndex(jni, FindClass(jni, state_class.c_str()),
-                           state_class, index);
-}
-
-static DataChannelInit JavaDataChannelInitToNative(
-    JNIEnv* jni, jobject j_init) {
-  DataChannelInit init;
-
-  jclass j_init_class = FindClass(jni, "org/webrtc/DataChannel$Init");
-  jfieldID ordered_id = GetFieldID(jni, j_init_class, "ordered", "Z");
-  jfieldID max_retransmit_time_id =
-      GetFieldID(jni, j_init_class, "maxRetransmitTimeMs", "I");
-  jfieldID max_retransmits_id =
-      GetFieldID(jni, j_init_class, "maxRetransmits", "I");
-  jfieldID protocol_id =
-      GetFieldID(jni, j_init_class, "protocol", "Ljava/lang/String;");
-  jfieldID negotiated_id = GetFieldID(jni, j_init_class, "negotiated", "Z");
-  jfieldID id_id = GetFieldID(jni, j_init_class, "id", "I");
-
-  init.ordered = GetBooleanField(jni, j_init, ordered_id);
-  init.maxRetransmitTime = GetIntField(jni, j_init, max_retransmit_time_id);
-  init.maxRetransmits = GetIntField(jni, j_init, max_retransmits_id);
-  init.protocol = JavaToStdString(
-      jni, GetStringField(jni, j_init, protocol_id));
-  init.negotiated = GetBooleanField(jni, j_init, negotiated_id);
-  init.id = GetIntField(jni, j_init, id_id);
-
-  return init;
-}
-
-class ConstraintsWrapper;
-
-// Adapter between the C++ PeerConnectionObserver interface and the Java
-// PeerConnection.Observer interface.  Wraps an instance of the Java interface
-// and dispatches C++ callbacks to Java.
-class PCOJava : public PeerConnectionObserver {
- public:
-  // We need these using declarations because there are two versions of each of
-  // the below methods and we only override one of them.
-  // TODO(deadbeef): Remove once there's only one version of the methods.
-  using PeerConnectionObserver::OnAddStream;
-  using PeerConnectionObserver::OnRemoveStream;
-  using PeerConnectionObserver::OnDataChannel;
-
-  PCOJava(JNIEnv* jni, jobject j_observer)
-      : j_observer_global_(jni, j_observer),
-        j_observer_class_(jni, GetObjectClass(jni, *j_observer_global_)),
-        j_media_stream_class_(jni, FindClass(jni, "org/webrtc/MediaStream")),
-        j_media_stream_ctor_(GetMethodID(
-            jni, *j_media_stream_class_, "<init>", "(J)V")),
-        j_audio_track_class_(jni, FindClass(jni, "org/webrtc/AudioTrack")),
-        j_audio_track_ctor_(GetMethodID(
-            jni, *j_audio_track_class_, "<init>", "(J)V")),
-        j_video_track_class_(jni, FindClass(jni, "org/webrtc/VideoTrack")),
-        j_video_track_ctor_(GetMethodID(
-            jni, *j_video_track_class_, "<init>", "(J)V")),
-        j_data_channel_class_(jni, FindClass(jni, "org/webrtc/DataChannel")),
-        j_data_channel_ctor_(GetMethodID(
-            jni, *j_data_channel_class_, "<init>", "(J)V")) {
-  }
-
-  virtual ~PCOJava() {
-    ScopedLocalRefFrame local_ref_frame(jni());
-    while (!remote_streams_.empty())
-      DisposeRemoteStream(remote_streams_.begin());
-  }
-
-  void OnIceCandidate(const IceCandidateInterface* candidate) override {
-    ScopedLocalRefFrame local_ref_frame(jni());
-    std::string sdp;
-    RTC_CHECK(candidate->ToString(&sdp)) << "got so far: " << sdp;
-    jclass candidate_class = FindClass(jni(), "org/webrtc/IceCandidate");
-    jmethodID ctor = GetMethodID(jni(), candidate_class,
-        "<init>", "(Ljava/lang/String;ILjava/lang/String;)V");
-    jstring j_mid = JavaStringFromStdString(jni(), candidate->sdp_mid());
-    jstring j_sdp = JavaStringFromStdString(jni(), sdp);
-    jobject j_candidate = jni()->NewObject(candidate_class, ctor, j_mid,
-                                           candidate->sdp_mline_index(), j_sdp);
-    CHECK_EXCEPTION(jni()) << "error during NewObject";
-    jmethodID m = GetMethodID(jni(), *j_observer_class_,
-                              "onIceCandidate", "(Lorg/webrtc/IceCandidate;)V");
-    jni()->CallVoidMethod(*j_observer_global_, m, j_candidate);
-    CHECK_EXCEPTION(jni()) << "error during CallVoidMethod";
-  }
-
-  void OnIceCandidatesRemoved(
-      const std::vector<cricket::Candidate>& candidates) override {
-    ScopedLocalRefFrame local_ref_frame(jni());
-    jobjectArray candidates_array = ToJavaCandidateArray(jni(), candidates);
-    jmethodID m =
-        GetMethodID(jni(), *j_observer_class_, "onIceCandidatesRemoved",
-                    "([Lorg/webrtc/IceCandidate;)V");
-    jni()->CallVoidMethod(*j_observer_global_, m, candidates_array);
-    CHECK_EXCEPTION(jni()) << "Error during CallVoidMethod";
-  }
-
-  void OnSignalingChange(
-      PeerConnectionInterface::SignalingState new_state) override {
-    ScopedLocalRefFrame local_ref_frame(jni());
-    jmethodID m = GetMethodID(
-        jni(), *j_observer_class_, "onSignalingChange",
-        "(Lorg/webrtc/PeerConnection$SignalingState;)V");
-    jobject new_state_enum =
-        JavaEnumFromIndex(jni(), "PeerConnection$SignalingState", new_state);
-    jni()->CallVoidMethod(*j_observer_global_, m, new_state_enum);
-    CHECK_EXCEPTION(jni()) << "error during CallVoidMethod";
-  }
-
-  void OnIceConnectionChange(
-      PeerConnectionInterface::IceConnectionState new_state) override {
-    ScopedLocalRefFrame local_ref_frame(jni());
-    jmethodID m = GetMethodID(
-        jni(), *j_observer_class_, "onIceConnectionChange",
-        "(Lorg/webrtc/PeerConnection$IceConnectionState;)V");
-    jobject new_state_enum = JavaEnumFromIndex(
-        jni(), "PeerConnection$IceConnectionState", new_state);
-    jni()->CallVoidMethod(*j_observer_global_, m, new_state_enum);
-    CHECK_EXCEPTION(jni()) << "error during CallVoidMethod";
-  }
-
-  void OnIceConnectionReceivingChange(bool receiving) override {
-    ScopedLocalRefFrame local_ref_frame(jni());
-    jmethodID m = GetMethodID(
-        jni(), *j_observer_class_, "onIceConnectionReceivingChange", "(Z)V");
-    jni()->CallVoidMethod(*j_observer_global_, m, receiving);
-    CHECK_EXCEPTION(jni()) << "error during CallVoidMethod";
-  }
-
-  void OnIceGatheringChange(
-      PeerConnectionInterface::IceGatheringState new_state) override {
-    ScopedLocalRefFrame local_ref_frame(jni());
-    jmethodID m = GetMethodID(
-        jni(), *j_observer_class_, "onIceGatheringChange",
-        "(Lorg/webrtc/PeerConnection$IceGatheringState;)V");
-    jobject new_state_enum = JavaEnumFromIndex(
-        jni(), "PeerConnection$IceGatheringState", new_state);
-    jni()->CallVoidMethod(*j_observer_global_, m, new_state_enum);
-    CHECK_EXCEPTION(jni()) << "error during CallVoidMethod";
-  }
-
-  void OnAddStream(rtc::scoped_refptr<MediaStreamInterface> stream) override {
-    ScopedLocalRefFrame local_ref_frame(jni());
-    // Java MediaStream holds one reference. Corresponding Release() is in
-    // MediaStream_free, triggered by MediaStream.dispose().
-    stream->AddRef();
-    jobject j_stream =
-        jni()->NewObject(*j_media_stream_class_, j_media_stream_ctor_,
-                         reinterpret_cast<jlong>(stream.get()));
-    CHECK_EXCEPTION(jni()) << "error during NewObject";
-
-    for (const auto& track : stream->GetAudioTracks()) {
-      jstring id = JavaStringFromStdString(jni(), track->id());
-      // Java AudioTrack holds one reference. Corresponding Release() is in
-      // MediaStreamTrack_free, triggered by AudioTrack.dispose().
-      track->AddRef();
-      jobject j_track =
-          jni()->NewObject(*j_audio_track_class_, j_audio_track_ctor_,
-                           reinterpret_cast<jlong>(track.get()), id);
-      CHECK_EXCEPTION(jni()) << "error during NewObject";
-      jfieldID audio_tracks_id = GetFieldID(jni(),
-                                            *j_media_stream_class_,
-                                            "audioTracks",
-                                            "Ljava/util/LinkedList;");
-      jobject audio_tracks = GetObjectField(jni(), j_stream, audio_tracks_id);
-      jmethodID add = GetMethodID(jni(),
-                                  GetObjectClass(jni(), audio_tracks),
-                                  "add",
-                                  "(Ljava/lang/Object;)Z");
-      jboolean added = jni()->CallBooleanMethod(audio_tracks, add, j_track);
-      CHECK_EXCEPTION(jni()) << "error during CallBooleanMethod";
-      RTC_CHECK(added);
-    }
-
-    for (const auto& track : stream->GetVideoTracks()) {
-      jstring id = JavaStringFromStdString(jni(), track->id());
-      // Java VideoTrack holds one reference. Corresponding Release() is in
-      // MediaStreamTrack_free, triggered by VideoTrack.dispose().
-      track->AddRef();
-      jobject j_track =
-          jni()->NewObject(*j_video_track_class_, j_video_track_ctor_,
-                           reinterpret_cast<jlong>(track.get()), id);
-      CHECK_EXCEPTION(jni()) << "error during NewObject";
-      jfieldID video_tracks_id = GetFieldID(jni(),
-                                            *j_media_stream_class_,
-                                            "videoTracks",
-                                            "Ljava/util/LinkedList;");
-      jobject video_tracks = GetObjectField(jni(), j_stream, video_tracks_id);
-      jmethodID add = GetMethodID(jni(),
-                                  GetObjectClass(jni(), video_tracks),
-                                  "add",
-                                  "(Ljava/lang/Object;)Z");
-      jboolean added = jni()->CallBooleanMethod(video_tracks, add, j_track);
-      CHECK_EXCEPTION(jni()) << "error during CallBooleanMethod";
-      RTC_CHECK(added);
-    }
-    remote_streams_[stream] = NewGlobalRef(jni(), j_stream);
-
-    jmethodID m = GetMethodID(jni(), *j_observer_class_, "onAddStream",
-                              "(Lorg/webrtc/MediaStream;)V");
-    jni()->CallVoidMethod(*j_observer_global_, m, j_stream);
-    CHECK_EXCEPTION(jni()) << "error during CallVoidMethod";
-  }
-
-  void OnRemoveStream(
-      rtc::scoped_refptr<MediaStreamInterface> stream) override {
-    ScopedLocalRefFrame local_ref_frame(jni());
-    NativeToJavaStreamsMap::iterator it = remote_streams_.find(stream);
-    RTC_CHECK(it != remote_streams_.end()) << "unexpected stream: " << std::hex
-                                           << stream;
-    jobject j_stream = it->second;
-    jmethodID m = GetMethodID(jni(), *j_observer_class_, "onRemoveStream",
-                              "(Lorg/webrtc/MediaStream;)V");
-    jni()->CallVoidMethod(*j_observer_global_, m, j_stream);
-    CHECK_EXCEPTION(jni()) << "error during CallVoidMethod";
-    // Release the refptr reference so that DisposeRemoteStream can assert
-    // it removes the final reference.
-    stream = nullptr;
-    DisposeRemoteStream(it);
-  }
-
-  void OnDataChannel(
-      rtc::scoped_refptr<DataChannelInterface> channel) override {
-    ScopedLocalRefFrame local_ref_frame(jni());
-    jobject j_channel = jni()->NewObject(
-        *j_data_channel_class_, j_data_channel_ctor_, (jlong)channel.get());
-    CHECK_EXCEPTION(jni()) << "error during NewObject";
-
-    jmethodID m = GetMethodID(jni(), *j_observer_class_, "onDataChannel",
-                              "(Lorg/webrtc/DataChannel;)V");
-    jni()->CallVoidMethod(*j_observer_global_, m, j_channel);
-
-    // Channel is now owned by Java object, and will be freed from
-    // DataChannel.dispose().  Important that this be done _after_ the
-    // CallVoidMethod above as Java code might call back into native code and be
-    // surprised to see a refcount of 2.
-    int bumped_count = channel->AddRef();
-    RTC_CHECK(bumped_count == 2) << "Unexpected refcount OnDataChannel";
-
-    CHECK_EXCEPTION(jni()) << "error during CallVoidMethod";
-  }
-
-  void OnRenegotiationNeeded() override {
-    ScopedLocalRefFrame local_ref_frame(jni());
-    jmethodID m =
-        GetMethodID(jni(), *j_observer_class_, "onRenegotiationNeeded", "()V");
-    jni()->CallVoidMethod(*j_observer_global_, m);
-    CHECK_EXCEPTION(jni()) << "error during CallVoidMethod";
-  }
-
-  void SetConstraints(ConstraintsWrapper* constraints) {
-    RTC_CHECK(!constraints_.get()) << "constraints already set!";
-    constraints_.reset(constraints);
-  }
-
-  const ConstraintsWrapper* constraints() { return constraints_.get(); }
-
- private:
-  typedef std::map<MediaStreamInterface*, jobject> NativeToJavaStreamsMap;
-
-  void DisposeRemoteStream(const NativeToJavaStreamsMap::iterator& it) {
-    jobject j_stream = it->second;
-    remote_streams_.erase(it);
-    jni()->CallVoidMethod(
-        j_stream, GetMethodID(jni(), *j_media_stream_class_, "dispose", "()V"));
-    CHECK_EXCEPTION(jni()) << "error during MediaStream.dispose()";
-    DeleteGlobalRef(jni(), j_stream);
-  }
-
-  jobject ToJavaCandidate(JNIEnv* jni,
-                          jclass* candidate_class,
-                          const cricket::Candidate& candidate) {
-    std::string sdp = webrtc::SdpSerializeCandidate(candidate);
-    RTC_CHECK(!sdp.empty()) << "got an empty ICE candidate";
-    jmethodID ctor = GetMethodID(jni, *candidate_class, "<init>",
-                                 "(Ljava/lang/String;ILjava/lang/String;)V");
-    jstring j_mid = JavaStringFromStdString(jni, candidate.transport_name());
-    jstring j_sdp = JavaStringFromStdString(jni, sdp);
-    // sdp_mline_index is not used, pass an invalid value -1.
-    jobject j_candidate =
-        jni->NewObject(*candidate_class, ctor, j_mid, -1, j_sdp);
-    CHECK_EXCEPTION(jni) << "error during Java Candidate NewObject";
-    return j_candidate;
-  }
-
-  jobjectArray ToJavaCandidateArray(
-      JNIEnv* jni,
-      const std::vector<cricket::Candidate>& candidates) {
-    jclass candidate_class = FindClass(jni, "org/webrtc/IceCandidate");
-    jobjectArray java_candidates =
-        jni->NewObjectArray(candidates.size(), candidate_class, NULL);
-    int i = 0;
-    for (const cricket::Candidate& candidate : candidates) {
-      jobject j_candidate = ToJavaCandidate(jni, &candidate_class, candidate);
-      jni->SetObjectArrayElement(java_candidates, i++, j_candidate);
-    }
-    return java_candidates;
-  }
-
-  JNIEnv* jni() {
-    return AttachCurrentThreadIfNeeded();
-  }
-
-  const ScopedGlobalRef<jobject> j_observer_global_;
-  const ScopedGlobalRef<jclass> j_observer_class_;
-  const ScopedGlobalRef<jclass> j_media_stream_class_;
-  const jmethodID j_media_stream_ctor_;
-  const ScopedGlobalRef<jclass> j_audio_track_class_;
-  const jmethodID j_audio_track_ctor_;
-  const ScopedGlobalRef<jclass> j_video_track_class_;
-  const jmethodID j_video_track_ctor_;
-  const ScopedGlobalRef<jclass> j_data_channel_class_;
-  const jmethodID j_data_channel_ctor_;
-  // C++ -> Java remote streams. The stored jobects are global refs and must be
-  // manually deleted upon removal. Use DisposeRemoteStream().
-  NativeToJavaStreamsMap remote_streams_;
-  std::unique_ptr<ConstraintsWrapper> constraints_;
-};
-
-// Wrapper for a Java MediaConstraints object.  Copies all needed data so when
-// the constructor returns the Java object is no longer needed.
-class ConstraintsWrapper : public MediaConstraintsInterface {
- public:
-  ConstraintsWrapper(JNIEnv* jni, jobject j_constraints) {
-    PopulateConstraintsFromJavaPairList(
-        jni, j_constraints, "mandatory", &mandatory_);
-    PopulateConstraintsFromJavaPairList(
-        jni, j_constraints, "optional", &optional_);
-  }
-
-  virtual ~ConstraintsWrapper() {}
-
-  // MediaConstraintsInterface.
-  const Constraints& GetMandatory() const override { return mandatory_; }
-
-  const Constraints& GetOptional() const override { return optional_; }
-
- private:
-  // Helper for translating a List<Pair<String, String>> to a Constraints.
-  static void PopulateConstraintsFromJavaPairList(
-      JNIEnv* jni, jobject j_constraints,
-      const char* field_name, Constraints* field) {
-    jfieldID j_id = GetFieldID(jni,
-        GetObjectClass(jni, j_constraints), field_name, "Ljava/util/List;");
-    jobject j_list = GetObjectField(jni, j_constraints, j_id);
-    for (jobject entry : Iterable(jni, j_list)) {
-      jmethodID get_key = GetMethodID(jni,
-          GetObjectClass(jni, entry), "getKey", "()Ljava/lang/String;");
-      jstring j_key = reinterpret_cast<jstring>(
-          jni->CallObjectMethod(entry, get_key));
-      CHECK_EXCEPTION(jni) << "error during CallObjectMethod";
-      jmethodID get_value = GetMethodID(jni,
-          GetObjectClass(jni, entry), "getValue", "()Ljava/lang/String;");
-      jstring j_value = reinterpret_cast<jstring>(
-          jni->CallObjectMethod(entry, get_value));
-      CHECK_EXCEPTION(jni) << "error during CallObjectMethod";
-      field->push_back(Constraint(JavaToStdString(jni, j_key),
-                                  JavaToStdString(jni, j_value)));
-    }
-  }
-
-  Constraints mandatory_;
-  Constraints optional_;
-};
-
-static jobject JavaSdpFromNativeSdp(
-    JNIEnv* jni, const SessionDescriptionInterface* desc) {
-  std::string sdp;
-  RTC_CHECK(desc->ToString(&sdp)) << "got so far: " << sdp;
-  jstring j_description = JavaStringFromStdString(jni, sdp);
-
-  jclass j_type_class = FindClass(
-      jni, "org/webrtc/SessionDescription$Type");
-  jmethodID j_type_from_canonical = GetStaticMethodID(
-      jni, j_type_class, "fromCanonicalForm",
-      "(Ljava/lang/String;)Lorg/webrtc/SessionDescription$Type;");
-  jstring j_type_string = JavaStringFromStdString(jni, desc->type());
-  jobject j_type = jni->CallStaticObjectMethod(
-      j_type_class, j_type_from_canonical, j_type_string);
-  CHECK_EXCEPTION(jni) << "error during CallObjectMethod";
-
-  jclass j_sdp_class = FindClass(jni, "org/webrtc/SessionDescription");
-  jmethodID j_sdp_ctor = GetMethodID(
-      jni, j_sdp_class, "<init>",
-      "(Lorg/webrtc/SessionDescription$Type;Ljava/lang/String;)V");
-  jobject j_sdp = jni->NewObject(
-      j_sdp_class, j_sdp_ctor, j_type, j_description);
-  CHECK_EXCEPTION(jni) << "error during NewObject";
-  return j_sdp;
-}
-
-template <class T>  // T is one of {Create,Set}SessionDescriptionObserver.
-class SdpObserverWrapper : public T {
- public:
-  SdpObserverWrapper(JNIEnv* jni, jobject j_observer,
-                     ConstraintsWrapper* constraints)
-      : constraints_(constraints),
-        j_observer_global_(jni, j_observer),
-        j_observer_class_(jni, GetObjectClass(jni, j_observer)) {
-  }
-
-  virtual ~SdpObserverWrapper() {}
-
-  // Can't mark override because of templating.
-  virtual void OnSuccess() {
-    ScopedLocalRefFrame local_ref_frame(jni());
-    jmethodID m = GetMethodID(jni(), *j_observer_class_, "onSetSuccess", "()V");
-    jni()->CallVoidMethod(*j_observer_global_, m);
-    CHECK_EXCEPTION(jni()) << "error during CallVoidMethod";
-  }
-
-  // Can't mark override because of templating.
-  virtual void OnSuccess(SessionDescriptionInterface* desc) {
-    ScopedLocalRefFrame local_ref_frame(jni());
-    jmethodID m = GetMethodID(
-        jni(), *j_observer_class_, "onCreateSuccess",
-        "(Lorg/webrtc/SessionDescription;)V");
-    jobject j_sdp = JavaSdpFromNativeSdp(jni(), desc);
-    jni()->CallVoidMethod(*j_observer_global_, m, j_sdp);
-    CHECK_EXCEPTION(jni()) << "error during CallVoidMethod";
-  }
-
- protected:
-  // Common implementation for failure of Set & Create types, distinguished by
-  // |op| being "Set" or "Create".
-  void DoOnFailure(const std::string& op, const std::string& error) {
-    jmethodID m = GetMethodID(jni(), *j_observer_class_, "on" + op + "Failure",
-                              "(Ljava/lang/String;)V");
-    jstring j_error_string = JavaStringFromStdString(jni(), error);
-    jni()->CallVoidMethod(*j_observer_global_, m, j_error_string);
-    CHECK_EXCEPTION(jni()) << "error during CallVoidMethod";
-  }
-
-  JNIEnv* jni() {
-    return AttachCurrentThreadIfNeeded();
-  }
-
- private:
-  std::unique_ptr<ConstraintsWrapper> constraints_;
-  const ScopedGlobalRef<jobject> j_observer_global_;
-  const ScopedGlobalRef<jclass> j_observer_class_;
-};
-
-class CreateSdpObserverWrapper
-    : public SdpObserverWrapper<CreateSessionDescriptionObserver> {
- public:
-  CreateSdpObserverWrapper(JNIEnv* jni, jobject j_observer,
-                           ConstraintsWrapper* constraints)
-      : SdpObserverWrapper(jni, j_observer, constraints) {}
-
-  void OnFailure(const std::string& error) override {
-    ScopedLocalRefFrame local_ref_frame(jni());
-    SdpObserverWrapper::DoOnFailure(std::string("Create"), error);
-  }
-};
-
-class SetSdpObserverWrapper
-    : public SdpObserverWrapper<SetSessionDescriptionObserver> {
- public:
-  SetSdpObserverWrapper(JNIEnv* jni, jobject j_observer,
-                        ConstraintsWrapper* constraints)
-      : SdpObserverWrapper(jni, j_observer, constraints) {}
-
-  void OnFailure(const std::string& error) override {
-    ScopedLocalRefFrame local_ref_frame(jni());
-    SdpObserverWrapper::DoOnFailure(std::string("Set"), error);
-  }
-};
-
-// Adapter for a Java DataChannel$Observer presenting a C++ DataChannelObserver
-// and dispatching the callback from C++ back to Java.
-class DataChannelObserverWrapper : public DataChannelObserver {
- public:
-  DataChannelObserverWrapper(JNIEnv* jni, jobject j_observer)
-      : j_observer_global_(jni, j_observer),
-        j_observer_class_(jni, GetObjectClass(jni, j_observer)),
-        j_buffer_class_(jni, FindClass(jni, "org/webrtc/DataChannel$Buffer")),
-        j_on_buffered_amount_change_mid_(GetMethodID(
-            jni, *j_observer_class_, "onBufferedAmountChange", "(J)V")),
-        j_on_state_change_mid_(
-            GetMethodID(jni, *j_observer_class_, "onStateChange", "()V")),
-        j_on_message_mid_(GetMethodID(jni, *j_observer_class_, "onMessage",
-                                      "(Lorg/webrtc/DataChannel$Buffer;)V")),
-        j_buffer_ctor_(GetMethodID(jni, *j_buffer_class_, "<init>",
-                                   "(Ljava/nio/ByteBuffer;Z)V")) {}
-
-  virtual ~DataChannelObserverWrapper() {}
-
-  void OnBufferedAmountChange(uint64_t previous_amount) override {
-    ScopedLocalRefFrame local_ref_frame(jni());
-    jni()->CallVoidMethod(*j_observer_global_, j_on_buffered_amount_change_mid_,
-                          previous_amount);
-    CHECK_EXCEPTION(jni()) << "error during CallVoidMethod";
-  }
-
-  void OnStateChange() override {
-    ScopedLocalRefFrame local_ref_frame(jni());
-    jni()->CallVoidMethod(*j_observer_global_, j_on_state_change_mid_);
-    CHECK_EXCEPTION(jni()) << "error during CallVoidMethod";
-  }
-
-  void OnMessage(const DataBuffer& buffer) override {
-    ScopedLocalRefFrame local_ref_frame(jni());
-    jobject byte_buffer = jni()->NewDirectByteBuffer(
-        const_cast<char*>(buffer.data.data<char>()), buffer.data.size());
-    jobject j_buffer = jni()->NewObject(*j_buffer_class_, j_buffer_ctor_,
-                                        byte_buffer, buffer.binary);
-    jni()->CallVoidMethod(*j_observer_global_, j_on_message_mid_, j_buffer);
-    CHECK_EXCEPTION(jni()) << "error during CallVoidMethod";
-  }
-
- private:
-  JNIEnv* jni() {
-    return AttachCurrentThreadIfNeeded();
-  }
-
-  const ScopedGlobalRef<jobject> j_observer_global_;
-  const ScopedGlobalRef<jclass> j_observer_class_;
-  const ScopedGlobalRef<jclass> j_buffer_class_;
-  const jmethodID j_on_buffered_amount_change_mid_;
-  const jmethodID j_on_state_change_mid_;
-  const jmethodID j_on_message_mid_;
-  const jmethodID j_buffer_ctor_;
-};
-
-// Adapter for a Java StatsObserver presenting a C++ StatsObserver and
-// dispatching the callback from C++ back to Java.
-class StatsObserverWrapper : public StatsObserver {
- public:
-  StatsObserverWrapper(JNIEnv* jni, jobject j_observer)
-      : j_observer_global_(jni, j_observer),
-        j_observer_class_(jni, GetObjectClass(jni, j_observer)),
-        j_stats_report_class_(jni, FindClass(jni, "org/webrtc/StatsReport")),
-        j_stats_report_ctor_(GetMethodID(
-            jni, *j_stats_report_class_, "<init>",
-            "(Ljava/lang/String;Ljava/lang/String;D"
-            "[Lorg/webrtc/StatsReport$Value;)V")),
-        j_value_class_(jni, FindClass(
-            jni, "org/webrtc/StatsReport$Value")),
-        j_value_ctor_(GetMethodID(
-            jni, *j_value_class_, "<init>",
-            "(Ljava/lang/String;Ljava/lang/String;)V")) {
-  }
-
-  virtual ~StatsObserverWrapper() {}
-
-  void OnComplete(const StatsReports& reports) override {
-    ScopedLocalRefFrame local_ref_frame(jni());
-    jobjectArray j_reports = ReportsToJava(jni(), reports);
-    jmethodID m = GetMethodID(jni(), *j_observer_class_, "onComplete",
-                              "([Lorg/webrtc/StatsReport;)V");
-    jni()->CallVoidMethod(*j_observer_global_, m, j_reports);
-    CHECK_EXCEPTION(jni()) << "error during CallVoidMethod";
-  }
-
- private:
-  jobjectArray ReportsToJava(
-      JNIEnv* jni, const StatsReports& reports) {
-    jobjectArray reports_array = jni->NewObjectArray(
-        reports.size(), *j_stats_report_class_, NULL);
-    int i = 0;
-    for (const auto* report : reports) {
-      ScopedLocalRefFrame local_ref_frame(jni);
-      jstring j_id = JavaStringFromStdString(jni, report->id()->ToString());
-      jstring j_type = JavaStringFromStdString(jni, report->TypeToString());
-      jobjectArray j_values = ValuesToJava(jni, report->values());
-      jobject j_report = jni->NewObject(*j_stats_report_class_,
-                                        j_stats_report_ctor_,
-                                        j_id,
-                                        j_type,
-                                        report->timestamp(),
-                                        j_values);
-      jni->SetObjectArrayElement(reports_array, i++, j_report);
-    }
-    return reports_array;
-  }
-
-  jobjectArray ValuesToJava(JNIEnv* jni, const StatsReport::Values& values) {
-    jobjectArray j_values = jni->NewObjectArray(
-        values.size(), *j_value_class_, NULL);
-    int i = 0;
-    for (const auto& it : values) {
-      ScopedLocalRefFrame local_ref_frame(jni);
-      // Should we use the '.name' enum value here instead of converting the
-      // name to a string?
-      jstring j_name = JavaStringFromStdString(jni, it.second->display_name());
-      jstring j_value = JavaStringFromStdString(jni, it.second->ToString());
-      jobject j_element_value =
-          jni->NewObject(*j_value_class_, j_value_ctor_, j_name, j_value);
-      jni->SetObjectArrayElement(j_values, i++, j_element_value);
-    }
-    return j_values;
-  }
-
-  JNIEnv* jni() {
-    return AttachCurrentThreadIfNeeded();
-  }
-
-  const ScopedGlobalRef<jobject> j_observer_global_;
-  const ScopedGlobalRef<jclass> j_observer_class_;
-  const ScopedGlobalRef<jclass> j_stats_report_class_;
-  const jmethodID j_stats_report_ctor_;
-  const ScopedGlobalRef<jclass> j_value_class_;
-  const jmethodID j_value_ctor_;
-};
-
-// Wrapper dispatching rtc::VideoSinkInterface to a Java VideoRenderer
-// instance.
-class JavaVideoRendererWrapper
-    : public rtc::VideoSinkInterface<cricket::VideoFrame> {
- public:
-  JavaVideoRendererWrapper(JNIEnv* jni, jobject j_callbacks)
-      : j_callbacks_(jni, j_callbacks),
-        j_render_frame_id_(GetMethodID(
-            jni, GetObjectClass(jni, j_callbacks), "renderFrame",
-            "(Lorg/webrtc/VideoRenderer$I420Frame;)V")),
-        j_frame_class_(jni,
-                       FindClass(jni, "org/webrtc/VideoRenderer$I420Frame")),
-        j_i420_frame_ctor_id_(GetMethodID(
-            jni, *j_frame_class_, "<init>", "(III[I[Ljava/nio/ByteBuffer;J)V")),
-        j_texture_frame_ctor_id_(GetMethodID(
-            jni, *j_frame_class_, "<init>",
-            "(IIII[FJ)V")),
-        j_byte_buffer_class_(jni, FindClass(jni, "java/nio/ByteBuffer")) {
-    CHECK_EXCEPTION(jni);
-  }
-
-  virtual ~JavaVideoRendererWrapper() {}
-
-  void OnFrame(const cricket::VideoFrame& video_frame) override {
-    ScopedLocalRefFrame local_ref_frame(jni());
-    jobject j_frame =
-        (video_frame.video_frame_buffer()->native_handle() != nullptr)
-            ? CricketToJavaTextureFrame(&video_frame)
-            : CricketToJavaI420Frame(&video_frame);
-    // |j_callbacks_| is responsible for releasing |j_frame| with
-    // VideoRenderer.renderFrameDone().
-    jni()->CallVoidMethod(*j_callbacks_, j_render_frame_id_, j_frame);
-    CHECK_EXCEPTION(jni());
-  }
-
- private:
-  // Make a shallow copy of |frame| to be used with Java. The callee has
-  // ownership of the frame, and the frame should be released with
-  // VideoRenderer.releaseNativeFrame().
-  static jlong javaShallowCopy(const cricket::VideoFrame* frame) {
-    return jlongFromPointer(frame->Copy());
-  }
-
-  // Return a VideoRenderer.I420Frame referring to the data in |frame|.
-  jobject CricketToJavaI420Frame(const cricket::VideoFrame* frame) {
-    jintArray strides = jni()->NewIntArray(3);
-    jint* strides_array = jni()->GetIntArrayElements(strides, NULL);
-    strides_array[0] = frame->video_frame_buffer()->StrideY();
-    strides_array[1] = frame->video_frame_buffer()->StrideU();
-    strides_array[2] = frame->video_frame_buffer()->StrideV();
-    jni()->ReleaseIntArrayElements(strides, strides_array, 0);
-    jobjectArray planes = jni()->NewObjectArray(3, *j_byte_buffer_class_, NULL);
-    jobject y_buffer = jni()->NewDirectByteBuffer(
-        const_cast<uint8_t*>(frame->video_frame_buffer()->DataY()),
-        frame->video_frame_buffer()->StrideY() *
-            frame->video_frame_buffer()->height());
-    size_t chroma_height = (frame->height() + 1) / 2;
-    jobject u_buffer = jni()->NewDirectByteBuffer(
-        const_cast<uint8_t*>(frame->video_frame_buffer()->DataU()),
-        frame->video_frame_buffer()->StrideU() * chroma_height);
-    jobject v_buffer = jni()->NewDirectByteBuffer(
-        const_cast<uint8_t*>(frame->video_frame_buffer()->DataV()),
-        frame->video_frame_buffer()->StrideV() * chroma_height);
-
-    jni()->SetObjectArrayElement(planes, 0, y_buffer);
-    jni()->SetObjectArrayElement(planes, 1, u_buffer);
-    jni()->SetObjectArrayElement(planes, 2, v_buffer);
-    return jni()->NewObject(
-        *j_frame_class_, j_i420_frame_ctor_id_,
-        frame->width(), frame->height(),
-        static_cast<int>(frame->rotation()),
-        strides, planes, javaShallowCopy(frame));
-  }
-
-  // Return a VideoRenderer.I420Frame referring texture object in |frame|.
-  jobject CricketToJavaTextureFrame(const cricket::VideoFrame* frame) {
-    NativeHandleImpl* handle = reinterpret_cast<NativeHandleImpl*>(
-        frame->video_frame_buffer()->native_handle());
-    jfloatArray sampling_matrix = handle->sampling_matrix.ToJava(jni());
-
-    return jni()->NewObject(
-        *j_frame_class_, j_texture_frame_ctor_id_,
-        frame->width(), frame->height(),
-        static_cast<int>(frame->rotation()),
-        handle->oes_texture_id, sampling_matrix, javaShallowCopy(frame));
-  }
-
-  JNIEnv* jni() {
-    return AttachCurrentThreadIfNeeded();
-  }
-
-  ScopedGlobalRef<jobject> j_callbacks_;
-  jmethodID j_render_frame_id_;
-  ScopedGlobalRef<jclass> j_frame_class_;
-  jmethodID j_i420_frame_ctor_id_;
-  jmethodID j_texture_frame_ctor_id_;
-  ScopedGlobalRef<jclass> j_byte_buffer_class_;
-};
-
-
-static DataChannelInterface* ExtractNativeDC(JNIEnv* jni, jobject j_dc) {
-  jfieldID native_dc_id = GetFieldID(jni,
-      GetObjectClass(jni, j_dc), "nativeDataChannel", "J");
-  jlong j_d = GetLongField(jni, j_dc, native_dc_id);
-  return reinterpret_cast<DataChannelInterface*>(j_d);
-}
-
-JOW(jlong, DataChannel_registerObserverNative)(
-    JNIEnv* jni, jobject j_dc, jobject j_observer) {
-  std::unique_ptr<DataChannelObserverWrapper> observer(
-      new DataChannelObserverWrapper(jni, j_observer));
-  ExtractNativeDC(jni, j_dc)->RegisterObserver(observer.get());
-  return jlongFromPointer(observer.release());
-}
-
-JOW(void, DataChannel_unregisterObserverNative)(
-    JNIEnv* jni, jobject j_dc, jlong native_observer) {
-  ExtractNativeDC(jni, j_dc)->UnregisterObserver();
-  delete reinterpret_cast<DataChannelObserverWrapper*>(native_observer);
-}
-
-JOW(jstring, DataChannel_label)(JNIEnv* jni, jobject j_dc) {
-  return JavaStringFromStdString(jni, ExtractNativeDC(jni, j_dc)->label());
-}
-
-JOW(jobject, DataChannel_state)(JNIEnv* jni, jobject j_dc) {
-  return JavaEnumFromIndex(
-      jni, "DataChannel$State", ExtractNativeDC(jni, j_dc)->state());
-}
-
-JOW(jlong, DataChannel_bufferedAmount)(JNIEnv* jni, jobject j_dc) {
-  uint64_t buffered_amount = ExtractNativeDC(jni, j_dc)->buffered_amount();
-  RTC_CHECK_LE(buffered_amount, std::numeric_limits<int64_t>::max())
-      << "buffered_amount overflowed jlong!";
-  return static_cast<jlong>(buffered_amount);
-}
-
-JOW(void, DataChannel_close)(JNIEnv* jni, jobject j_dc) {
-  ExtractNativeDC(jni, j_dc)->Close();
-}
-
-JOW(jboolean, DataChannel_sendNative)(JNIEnv* jni, jobject j_dc,
-                                      jbyteArray data, jboolean binary) {
-  jbyte* bytes = jni->GetByteArrayElements(data, NULL);
-  bool ret = ExtractNativeDC(jni, j_dc)->Send(DataBuffer(
-      rtc::CopyOnWriteBuffer(bytes, jni->GetArrayLength(data)),
-      binary));
-  jni->ReleaseByteArrayElements(data, bytes, JNI_ABORT);
-  return ret;
-}
-
-JOW(void, DataChannel_dispose)(JNIEnv* jni, jobject j_dc) {
-  CHECK_RELEASE(ExtractNativeDC(jni, j_dc));
-}
-
-JOW(void, Logging_nativeEnableTracing)(
-    JNIEnv* jni, jclass, jstring j_path, jint nativeLevels) {
-  std::string path = JavaToStdString(jni, j_path);
-  if (nativeLevels != webrtc::kTraceNone) {
-    webrtc::Trace::set_level_filter(nativeLevels);
-    if (path != "logcat:") {
-      RTC_CHECK_EQ(0, webrtc::Trace::SetTraceFile(path.c_str(), false))
-          << "SetTraceFile failed";
-    } else {
-      // Intentionally leak this to avoid needing to reason about its lifecycle.
-      // It keeps no state and functions only as a dispatch point.
-      static LogcatTraceContext* g_trace_callback = new LogcatTraceContext();
-    }
-  }
-}
-
-JOW(void, Logging_nativeEnableLogToDebugOutput)
-    (JNIEnv *jni, jclass, jint nativeSeverity) {
-  if (nativeSeverity >= rtc::LS_SENSITIVE && nativeSeverity <= rtc::LS_NONE) {
-    rtc::LogMessage::LogToDebug(
-        static_cast<rtc::LoggingSeverity>(nativeSeverity));
-  }
-}
-
-JOW(void, Logging_nativeEnableLogThreads)(JNIEnv* jni, jclass) {
-  rtc::LogMessage::LogThreads(true);
-}
-
-JOW(void, Logging_nativeEnableLogTimeStamps)(JNIEnv* jni, jclass) {
-  rtc::LogMessage::LogTimestamps(true);
-}
-
-JOW(void, Logging_nativeLog)(
-    JNIEnv* jni, jclass, jint j_severity, jstring j_tag, jstring j_message) {
-  std::string message = JavaToStdString(jni, j_message);
-  std::string tag = JavaToStdString(jni, j_tag);
-  LOG_TAG(static_cast<rtc::LoggingSeverity>(j_severity), tag) << message;
-}
-
-JOW(void, PeerConnection_freePeerConnection)(JNIEnv*, jclass, jlong j_p) {
-  CHECK_RELEASE(reinterpret_cast<PeerConnectionInterface*>(j_p));
-}
-
-JOW(void, PeerConnection_freeObserver)(JNIEnv*, jclass, jlong j_p) {
-  PCOJava* p = reinterpret_cast<PCOJava*>(j_p);
-  delete p;
-}
-
-JOW(void, MediaSource_free)(JNIEnv*, jclass, jlong j_p) {
-  CHECK_RELEASE(reinterpret_cast<MediaSourceInterface*>(j_p));
-}
-
-JOW(void, VideoRenderer_freeWrappedVideoRenderer)(JNIEnv*, jclass, jlong j_p) {
-  delete reinterpret_cast<JavaVideoRendererWrapper*>(j_p);
-}
-
-JOW(void, VideoRenderer_releaseNativeFrame)(
-    JNIEnv* jni, jclass, jlong j_frame_ptr) {
-  delete reinterpret_cast<const cricket::VideoFrame*>(j_frame_ptr);
-}
-
-JOW(void, MediaStreamTrack_free)(JNIEnv*, jclass, jlong j_p) {
-  reinterpret_cast<MediaStreamTrackInterface*>(j_p)->Release();
-}
-
-JOW(jboolean, MediaStream_nativeAddAudioTrack)(
-    JNIEnv* jni, jclass, jlong pointer, jlong j_audio_track_pointer) {
-  return reinterpret_cast<MediaStreamInterface*>(pointer)->AddTrack(
-      reinterpret_cast<AudioTrackInterface*>(j_audio_track_pointer));
-}
-
-JOW(jboolean, MediaStream_nativeAddVideoTrack)(
-    JNIEnv* jni, jclass, jlong pointer, jlong j_video_track_pointer) {
-  return reinterpret_cast<MediaStreamInterface*>(pointer)
-      ->AddTrack(reinterpret_cast<VideoTrackInterface*>(j_video_track_pointer));
-}
-
-JOW(jboolean, MediaStream_nativeRemoveAudioTrack)(
-    JNIEnv* jni, jclass, jlong pointer, jlong j_audio_track_pointer) {
-  return reinterpret_cast<MediaStreamInterface*>(pointer)->RemoveTrack(
-      reinterpret_cast<AudioTrackInterface*>(j_audio_track_pointer));
-}
-
-JOW(jboolean, MediaStream_nativeRemoveVideoTrack)(
-    JNIEnv* jni, jclass, jlong pointer, jlong j_video_track_pointer) {
-  return reinterpret_cast<MediaStreamInterface*>(pointer)->RemoveTrack(
-      reinterpret_cast<VideoTrackInterface*>(j_video_track_pointer));
-}
-
-JOW(jstring, MediaStream_nativeLabel)(JNIEnv* jni, jclass, jlong j_p) {
-  return JavaStringFromStdString(
-      jni, reinterpret_cast<MediaStreamInterface*>(j_p)->label());
-}
-
-JOW(void, MediaStream_free)(JNIEnv*, jclass, jlong j_p) {
-  CHECK_RELEASE(reinterpret_cast<MediaStreamInterface*>(j_p));
-}
-
-JOW(jlong, PeerConnectionFactory_nativeCreateObserver)(
-    JNIEnv * jni, jclass, jobject j_observer) {
-  return (jlong)new PCOJava(jni, j_observer);
-}
-
-JOW(jboolean, PeerConnectionFactory_initializeAndroidGlobals)(
-    JNIEnv* jni, jclass, jobject context,
-    jboolean initialize_audio, jboolean initialize_video,
-    jboolean video_hw_acceleration) {
-  bool failure = false;
-  video_hw_acceleration_enabled = video_hw_acceleration;
-  AndroidNetworkMonitor::SetAndroidContext(jni, context);
-  if (!factory_static_initialized) {
-    if (initialize_video) {
-      failure |= AndroidVideoCapturerJni::SetAndroidObjects(jni, context);
-    }
-    if (initialize_audio)
-      failure |= webrtc::VoiceEngine::SetAndroidObjects(GetJVM(), context);
-    factory_static_initialized = true;
-  }
-  return !failure;
-}
-
-JOW(void, PeerConnectionFactory_initializeFieldTrials)(
-    JNIEnv* jni, jclass, jstring j_trials_init_string) {
-  field_trials_init_string = NULL;
-  if (j_trials_init_string != NULL) {
-    const char* init_string =
-        jni->GetStringUTFChars(j_trials_init_string, NULL);
-    int init_string_length = jni->GetStringUTFLength(j_trials_init_string);
-    field_trials_init_string = new char[init_string_length + 1];
-    rtc::strcpyn(field_trials_init_string, init_string_length + 1, init_string);
-    jni->ReleaseStringUTFChars(j_trials_init_string, init_string);
-    LOG(LS_INFO) << "initializeFieldTrials: " << field_trials_init_string;
-  }
-  webrtc::field_trial::InitFieldTrialsFromString(field_trials_init_string);
-}
-
-JOW(void, PeerConnectionFactory_initializeInternalTracer)(JNIEnv* jni, jclass) {
-  rtc::tracing::SetupInternalTracer();
-}
-
-JOW(jboolean, PeerConnectionFactory_startInternalTracingCapture)(
-    JNIEnv* jni, jclass, jstring j_event_tracing_filename) {
-  if (!j_event_tracing_filename)
-    return false;
-
-  const char* init_string =
-      jni->GetStringUTFChars(j_event_tracing_filename, NULL);
-  LOG(LS_INFO) << "Starting internal tracing to: " << init_string;
-  bool ret = rtc::tracing::StartInternalCapture(init_string);
-  jni->ReleaseStringUTFChars(j_event_tracing_filename, init_string);
-  return ret;
-}
-
-JOW(void, PeerConnectionFactory_stopInternalTracingCapture)(
-    JNIEnv* jni, jclass) {
-  rtc::tracing::StopInternalCapture();
-}
-
-JOW(void, PeerConnectionFactory_shutdownInternalTracer)(JNIEnv* jni, jclass) {
-  rtc::tracing::ShutdownInternalTracer();
-}
-
-// Helper struct for working around the fact that CreatePeerConnectionFactory()
-// comes in two flavors: either entirely automagical (constructing its own
-// threads and deleting them on teardown, but no external codec factory support)
-// or entirely manual (requires caller to delete threads after factory
-// teardown).  This struct takes ownership of its ctor's arguments to present a
-// single thing for Java to hold and eventually free.
-class OwnedFactoryAndThreads {
- public:
-  OwnedFactoryAndThreads(std::unique_ptr<Thread> network_thread,
-                         std::unique_ptr<Thread> worker_thread,
-                         std::unique_ptr<Thread> signaling_thread,
-                         WebRtcVideoEncoderFactory* encoder_factory,
-                         WebRtcVideoDecoderFactory* decoder_factory,
-                         rtc::NetworkMonitorFactory* network_monitor_factory,
-                         PeerConnectionFactoryInterface* factory)
-      : network_thread_(std::move(network_thread)),
-        worker_thread_(std::move(worker_thread)),
-        signaling_thread_(std::move(signaling_thread)),
-        encoder_factory_(encoder_factory),
-        decoder_factory_(decoder_factory),
-        network_monitor_factory_(network_monitor_factory),
-        factory_(factory) {}
-
-  ~OwnedFactoryAndThreads() {
-    CHECK_RELEASE(factory_);
-    if (network_monitor_factory_ != nullptr) {
-      rtc::NetworkMonitorFactory::ReleaseFactory(network_monitor_factory_);
-    }
-  }
-
-  PeerConnectionFactoryInterface* factory() { return factory_; }
-  WebRtcVideoEncoderFactory* encoder_factory() { return encoder_factory_; }
-  WebRtcVideoDecoderFactory* decoder_factory() { return decoder_factory_; }
-  rtc::NetworkMonitorFactory* network_monitor_factory() {
-    return network_monitor_factory_;
-  }
-  void clear_network_monitor_factory() { network_monitor_factory_ = nullptr; }
-  void InvokeJavaCallbacksOnFactoryThreads();
-
- private:
-  void JavaCallbackOnFactoryThreads();
-
-  const std::unique_ptr<Thread> network_thread_;
-  const std::unique_ptr<Thread> worker_thread_;
-  const std::unique_ptr<Thread> signaling_thread_;
-  WebRtcVideoEncoderFactory* encoder_factory_;
-  WebRtcVideoDecoderFactory* decoder_factory_;
-  rtc::NetworkMonitorFactory* network_monitor_factory_;
-  PeerConnectionFactoryInterface* factory_;  // Const after ctor except dtor.
-};
-
-void OwnedFactoryAndThreads::JavaCallbackOnFactoryThreads() {
-  JNIEnv* jni = AttachCurrentThreadIfNeeded();
-  ScopedLocalRefFrame local_ref_frame(jni);
-  jclass j_factory_class = FindClass(jni, "org/webrtc/PeerConnectionFactory");
-  jmethodID m = nullptr;
-  if (network_thread_->IsCurrent()) {
-    LOG(LS_INFO) << "Network thread JavaCallback";
-    m = GetStaticMethodID(jni, j_factory_class, "onNetworkThreadReady", "()V");
-  }
-  if (worker_thread_->IsCurrent()) {
-    LOG(LS_INFO) << "Worker thread JavaCallback";
-    m = GetStaticMethodID(jni, j_factory_class, "onWorkerThreadReady", "()V");
-  }
-  if (signaling_thread_->IsCurrent()) {
-    LOG(LS_INFO) << "Signaling thread JavaCallback";
-    m = GetStaticMethodID(
-        jni, j_factory_class, "onSignalingThreadReady", "()V");
-  }
-  if (m != nullptr) {
-    jni->CallStaticVoidMethod(j_factory_class, m);
-    CHECK_EXCEPTION(jni) << "error during JavaCallback::CallStaticVoidMethod";
-  }
-}
-
-void OwnedFactoryAndThreads::InvokeJavaCallbacksOnFactoryThreads() {
-  LOG(LS_INFO) << "InvokeJavaCallbacksOnFactoryThreads.";
-  network_thread_->Invoke<void>(RTC_FROM_HERE,
-                                [this] { JavaCallbackOnFactoryThreads(); });
-  worker_thread_->Invoke<void>(RTC_FROM_HERE,
-                               [this] { JavaCallbackOnFactoryThreads(); });
-  signaling_thread_->Invoke<void>(RTC_FROM_HERE,
-                                  [this] { JavaCallbackOnFactoryThreads(); });
-}
-
-PeerConnectionFactoryInterface::Options ParseOptionsFromJava(JNIEnv* jni,
-                                                             jobject options) {
-  jclass options_class = jni->GetObjectClass(options);
-  jfieldID network_ignore_mask_field =
-      jni->GetFieldID(options_class, "networkIgnoreMask", "I");
-  int network_ignore_mask =
-      jni->GetIntField(options, network_ignore_mask_field);
-
-  jfieldID disable_encryption_field =
-      jni->GetFieldID(options_class, "disableEncryption", "Z");
-  bool disable_encryption =
-      jni->GetBooleanField(options, disable_encryption_field);
-
-  jfieldID disable_network_monitor_field =
-      jni->GetFieldID(options_class, "disableNetworkMonitor", "Z");
-  bool disable_network_monitor =
-      jni->GetBooleanField(options, disable_network_monitor_field);
-
-  PeerConnectionFactoryInterface::Options native_options;
-
-  // This doesn't necessarily match the c++ version of this struct; feel free
-  // to add more parameters as necessary.
-  native_options.network_ignore_mask = network_ignore_mask;
-  native_options.disable_encryption = disable_encryption;
-  native_options.disable_network_monitor = disable_network_monitor;
-  return native_options;
-}
-
-JOW(jlong, PeerConnectionFactory_nativeCreatePeerConnectionFactory)(
-    JNIEnv* jni, jclass, jobject joptions) {
-  // talk/ assumes pretty widely that the current Thread is ThreadManager'd, but
-  // ThreadManager only WrapCurrentThread()s the thread where it is first
-  // created.  Since the semantics around when auto-wrapping happens in
-  // webrtc/base/ are convoluted, we simply wrap here to avoid having to think
-  // about ramifications of auto-wrapping there.
-  rtc::ThreadManager::Instance()->WrapCurrentThread();
-  webrtc::Trace::CreateTrace();
-
-  std::unique_ptr<Thread> network_thread =
-      rtc::Thread::CreateWithSocketServer();
-  network_thread->SetName("network_thread", nullptr);
-  RTC_CHECK(network_thread->Start()) << "Failed to start thread";
-
-  std::unique_ptr<Thread> worker_thread = rtc::Thread::Create();
-  worker_thread->SetName("worker_thread", nullptr);
-  RTC_CHECK(worker_thread->Start()) << "Failed to start thread";
-
-  std::unique_ptr<Thread> signaling_thread = rtc::Thread::Create();
-  signaling_thread->SetName("signaling_thread", NULL);
-  RTC_CHECK(signaling_thread->Start()) << "Failed to start thread";
-
-  WebRtcVideoEncoderFactory* encoder_factory = nullptr;
-  WebRtcVideoDecoderFactory* decoder_factory = nullptr;
-  rtc::NetworkMonitorFactory* network_monitor_factory = nullptr;
-
-  PeerConnectionFactoryInterface::Options options;
-  bool has_options = joptions != NULL;
-  if (has_options) {
-    options = ParseOptionsFromJava(jni, joptions);
-  }
-
-  if (video_hw_acceleration_enabled) {
-    encoder_factory = new MediaCodecVideoEncoderFactory();
-    decoder_factory = new MediaCodecVideoDecoderFactory();
-  }
-  // Do not create network_monitor_factory only if the options are
-  // provided and disable_network_monitor therein is set to true.
-  if (!(has_options && options.disable_network_monitor)) {
-    network_monitor_factory = new AndroidNetworkMonitorFactory();
-    rtc::NetworkMonitorFactory::SetFactory(network_monitor_factory);
-  }
-
-  rtc::scoped_refptr<PeerConnectionFactoryInterface> factory(
-      webrtc::CreatePeerConnectionFactory(
-          network_thread.get(), worker_thread.get(), signaling_thread.get(),
-          nullptr, encoder_factory, decoder_factory));
-  RTC_CHECK(factory) << "Failed to create the peer connection factory; "
-                     << "WebRTC/libjingle init likely failed on this device";
-  // TODO(honghaiz): Maybe put the options as the argument of
-  // CreatePeerConnectionFactory.
-  if (has_options) {
-    factory->SetOptions(options);
-  }
-  OwnedFactoryAndThreads* owned_factory = new OwnedFactoryAndThreads(
-      std::move(network_thread), std::move(worker_thread),
-      std::move(signaling_thread), encoder_factory, decoder_factory,
-      network_monitor_factory, factory.release());
-  owned_factory->InvokeJavaCallbacksOnFactoryThreads();
-  return jlongFromPointer(owned_factory);
-}
-
-JOW(void, PeerConnectionFactory_nativeFreeFactory)(JNIEnv*, jclass, jlong j_p) {
-  delete reinterpret_cast<OwnedFactoryAndThreads*>(j_p);
-  if (field_trials_init_string) {
-    webrtc::field_trial::InitFieldTrialsFromString(NULL);
-    delete field_trials_init_string;
-    field_trials_init_string = NULL;
-  }
-  webrtc::Trace::ReturnTrace();
-}
-
-static PeerConnectionFactoryInterface* factoryFromJava(jlong j_p) {
-  return reinterpret_cast<OwnedFactoryAndThreads*>(j_p)->factory();
-}
-
-JOW(void, PeerConnectionFactory_nativeThreadsCallbacks)(
-    JNIEnv*, jclass, jlong j_p) {
-  OwnedFactoryAndThreads *factory =
-      reinterpret_cast<OwnedFactoryAndThreads*>(j_p);
-  factory->InvokeJavaCallbacksOnFactoryThreads();
-}
-
-JOW(jlong, PeerConnectionFactory_nativeCreateLocalMediaStream)(
-    JNIEnv* jni, jclass, jlong native_factory, jstring label) {
-  rtc::scoped_refptr<PeerConnectionFactoryInterface> factory(
-      factoryFromJava(native_factory));
-  rtc::scoped_refptr<MediaStreamInterface> stream(
-      factory->CreateLocalMediaStream(JavaToStdString(jni, label)));
-  return (jlong)stream.release();
-}
-
-JOW(jlong, PeerConnectionFactory_nativeCreateVideoSource)(
-    JNIEnv* jni, jclass, jlong native_factory, jobject j_egl_context,
-    jobject j_video_capturer, jobject j_constraints) {
-  // Create a cricket::VideoCapturer from |j_video_capturer|.
-  rtc::scoped_refptr<webrtc::AndroidVideoCapturerDelegate> delegate =
-      new rtc::RefCountedObject<AndroidVideoCapturerJni>(
-          jni, j_video_capturer, j_egl_context);
-  std::unique_ptr<cricket::VideoCapturer> capturer(
-      new webrtc::AndroidVideoCapturer(delegate));
-  // Create a webrtc::VideoTrackSourceInterface from the cricket::VideoCapturer,
-  // native factory and constraints.
-  std::unique_ptr<ConstraintsWrapper> constraints(
-      new ConstraintsWrapper(jni, j_constraints));
-  rtc::scoped_refptr<PeerConnectionFactoryInterface> factory(
-      factoryFromJava(native_factory));
-  rtc::scoped_refptr<VideoTrackSourceInterface> source(
-      factory->CreateVideoSource(capturer.release(), constraints.get()));
-  return (jlong)source.release();
-}
-
-JOW(jlong, PeerConnectionFactory_nativeCreateVideoTrack)(
-    JNIEnv* jni, jclass, jlong native_factory, jstring id,
-    jlong native_source) {
-  rtc::scoped_refptr<PeerConnectionFactoryInterface> factory(
-      factoryFromJava(native_factory));
-  rtc::scoped_refptr<VideoTrackInterface> track(factory->CreateVideoTrack(
-      JavaToStdString(jni, id),
-      reinterpret_cast<VideoTrackSourceInterface*>(native_source)));
-  return (jlong)track.release();
-}
-
-JOW(jlong, PeerConnectionFactory_nativeCreateAudioSource)(
-    JNIEnv* jni, jclass, jlong native_factory, jobject j_constraints) {
-  std::unique_ptr<ConstraintsWrapper> constraints(
-      new ConstraintsWrapper(jni, j_constraints));
-  rtc::scoped_refptr<PeerConnectionFactoryInterface> factory(
-      factoryFromJava(native_factory));
-  rtc::scoped_refptr<AudioSourceInterface> source(
-      factory->CreateAudioSource(constraints.get()));
-  return (jlong)source.release();
-}
-
-JOW(jlong, PeerConnectionFactory_nativeCreateAudioTrack)(
-    JNIEnv* jni, jclass, jlong native_factory, jstring id,
-    jlong native_source) {
-  rtc::scoped_refptr<PeerConnectionFactoryInterface> factory(
-      factoryFromJava(native_factory));
-  rtc::scoped_refptr<AudioTrackInterface> track(factory->CreateAudioTrack(
-      JavaToStdString(jni, id),
-      reinterpret_cast<AudioSourceInterface*>(native_source)));
-  return (jlong)track.release();
-}
-
-JOW(jboolean, PeerConnectionFactory_nativeStartAecDump)(
-    JNIEnv* jni, jclass, jlong native_factory, jint file,
-    jint filesize_limit_bytes) {
-  rtc::scoped_refptr<PeerConnectionFactoryInterface> factory(
-      factoryFromJava(native_factory));
-  return factory->StartAecDump(file, filesize_limit_bytes);
-}
-
-JOW(void, PeerConnectionFactory_nativeStopAecDump)(
-    JNIEnv* jni, jclass, jlong native_factory) {
-  rtc::scoped_refptr<PeerConnectionFactoryInterface> factory(
-      factoryFromJava(native_factory));
-  factory->StopAecDump();
-}
-
-JOW(jboolean, PeerConnectionFactory_nativeStartRtcEventLog)
-(JNIEnv* jni,
- jclass,
- jlong native_factory,
- jint file,
- jint filesize_limit_bytes) {
-  rtc::scoped_refptr<PeerConnectionFactoryInterface> factory(
-      factoryFromJava(native_factory));
-  return factory->StartRtcEventLog(file, filesize_limit_bytes);
-}
-
-JOW(void, PeerConnectionFactory_nativeStopRtcEventLog)(
-    JNIEnv* jni, jclass, jlong native_factory) {
-  rtc::scoped_refptr<PeerConnectionFactoryInterface> factory(
-      factoryFromJava(native_factory));
-  factory->StopRtcEventLog();
-}
-
-JOW(void, PeerConnectionFactory_nativeSetOptions)(
-    JNIEnv* jni, jclass, jlong native_factory, jobject options) {
-  rtc::scoped_refptr<PeerConnectionFactoryInterface> factory(
-      factoryFromJava(native_factory));
-  PeerConnectionFactoryInterface::Options options_to_set =
-      ParseOptionsFromJava(jni, options);
-  factory->SetOptions(options_to_set);
-
-  if (options_to_set.disable_network_monitor) {
-    OwnedFactoryAndThreads* owner =
-        reinterpret_cast<OwnedFactoryAndThreads*>(native_factory);
-    if (owner->network_monitor_factory()) {
-      rtc::NetworkMonitorFactory::ReleaseFactory(
-          owner->network_monitor_factory());
-      owner->clear_network_monitor_factory();
-    }
-  }
-}
-
-JOW(void, PeerConnectionFactory_nativeSetVideoHwAccelerationOptions)(
-    JNIEnv* jni, jclass, jlong native_factory, jobject local_egl_context,
-    jobject remote_egl_context) {
-  OwnedFactoryAndThreads* owned_factory =
-      reinterpret_cast<OwnedFactoryAndThreads*>(native_factory);
-
-  jclass j_eglbase14_context_class =
-      FindClass(jni, "org/webrtc/EglBase14$Context");
-
-  MediaCodecVideoEncoderFactory* encoder_factory =
-      static_cast<MediaCodecVideoEncoderFactory*>
-          (owned_factory->encoder_factory());
-  if (encoder_factory &&
-      jni->IsInstanceOf(local_egl_context, j_eglbase14_context_class)) {
-    LOG(LS_INFO) << "Set EGL context for HW encoding.";
-    encoder_factory->SetEGLContext(jni, local_egl_context);
-  }
-
-  MediaCodecVideoDecoderFactory* decoder_factory =
-      static_cast<MediaCodecVideoDecoderFactory*>
-          (owned_factory->decoder_factory());
-  if (decoder_factory) {
-    LOG(LS_INFO) << "Set EGL context for HW decoding.";
-    decoder_factory->SetEGLContext(jni, remote_egl_context);
-  }
-}
-
-static PeerConnectionInterface::IceTransportsType
-JavaIceTransportsTypeToNativeType(JNIEnv* jni, jobject j_ice_transports_type) {
-  std::string enum_name = GetJavaEnumName(
-      jni, "org/webrtc/PeerConnection$IceTransportsType",
-      j_ice_transports_type);
-
-  if (enum_name == "ALL")
-    return PeerConnectionInterface::kAll;
-
-  if (enum_name == "RELAY")
-    return PeerConnectionInterface::kRelay;
-
-  if (enum_name == "NOHOST")
-    return PeerConnectionInterface::kNoHost;
-
-  if (enum_name == "NONE")
-    return PeerConnectionInterface::kNone;
-
-  RTC_CHECK(false) << "Unexpected IceTransportsType enum_name " << enum_name;
-  return PeerConnectionInterface::kAll;
-}
-
-static PeerConnectionInterface::BundlePolicy
-JavaBundlePolicyToNativeType(JNIEnv* jni, jobject j_bundle_policy) {
-  std::string enum_name = GetJavaEnumName(
-      jni, "org/webrtc/PeerConnection$BundlePolicy",
-      j_bundle_policy);
-
-  if (enum_name == "BALANCED")
-    return PeerConnectionInterface::kBundlePolicyBalanced;
-
-  if (enum_name == "MAXBUNDLE")
-    return PeerConnectionInterface::kBundlePolicyMaxBundle;
-
-  if (enum_name == "MAXCOMPAT")
-    return PeerConnectionInterface::kBundlePolicyMaxCompat;
-
-  RTC_CHECK(false) << "Unexpected BundlePolicy enum_name " << enum_name;
-  return PeerConnectionInterface::kBundlePolicyBalanced;
-}
-
-static PeerConnectionInterface::RtcpMuxPolicy
-JavaRtcpMuxPolicyToNativeType(JNIEnv* jni, jobject j_rtcp_mux_policy) {
-  std::string enum_name = GetJavaEnumName(
-      jni, "org/webrtc/PeerConnection$RtcpMuxPolicy",
-      j_rtcp_mux_policy);
-
-  if (enum_name == "NEGOTIATE")
-    return PeerConnectionInterface::kRtcpMuxPolicyNegotiate;
-
-  if (enum_name == "REQUIRE")
-    return PeerConnectionInterface::kRtcpMuxPolicyRequire;
-
-  RTC_CHECK(false) << "Unexpected RtcpMuxPolicy enum_name " << enum_name;
-  return PeerConnectionInterface::kRtcpMuxPolicyNegotiate;
-}
-
-static PeerConnectionInterface::TcpCandidatePolicy
-JavaTcpCandidatePolicyToNativeType(
-    JNIEnv* jni, jobject j_tcp_candidate_policy) {
-  std::string enum_name = GetJavaEnumName(
-      jni, "org/webrtc/PeerConnection$TcpCandidatePolicy",
-      j_tcp_candidate_policy);
-
-  if (enum_name == "ENABLED")
-    return PeerConnectionInterface::kTcpCandidatePolicyEnabled;
-
-  if (enum_name == "DISABLED")
-    return PeerConnectionInterface::kTcpCandidatePolicyDisabled;
-
-  RTC_CHECK(false) << "Unexpected TcpCandidatePolicy enum_name " << enum_name;
-  return PeerConnectionInterface::kTcpCandidatePolicyEnabled;
-}
-
-static PeerConnectionInterface::CandidateNetworkPolicy
-JavaCandidateNetworkPolicyToNativeType(JNIEnv* jni,
-                                       jobject j_candidate_network_policy) {
-  std::string enum_name =
-      GetJavaEnumName(jni, "org/webrtc/PeerConnection$CandidateNetworkPolicy",
-                      j_candidate_network_policy);
-
-  if (enum_name == "ALL")
-    return PeerConnectionInterface::kCandidateNetworkPolicyAll;
-
-  if (enum_name == "LOW_COST")
-    return PeerConnectionInterface::kCandidateNetworkPolicyLowCost;
-
-  RTC_CHECK(false) << "Unexpected CandidateNetworkPolicy enum_name "
-                   << enum_name;
-  return PeerConnectionInterface::kCandidateNetworkPolicyAll;
-}
-
-static rtc::KeyType JavaKeyTypeToNativeType(JNIEnv* jni, jobject j_key_type) {
-  std::string enum_name = GetJavaEnumName(
-      jni, "org/webrtc/PeerConnection$KeyType", j_key_type);
-
-  if (enum_name == "RSA")
-    return rtc::KT_RSA;
-  if (enum_name == "ECDSA")
-    return rtc::KT_ECDSA;
-
-  RTC_CHECK(false) << "Unexpected KeyType enum_name " << enum_name;
-  return rtc::KT_ECDSA;
-}
-
-static PeerConnectionInterface::ContinualGatheringPolicy
-    JavaContinualGatheringPolicyToNativeType(
-        JNIEnv* jni, jobject j_gathering_policy) {
-  std::string enum_name = GetJavaEnumName(
-      jni, "org/webrtc/PeerConnection$ContinualGatheringPolicy",
-      j_gathering_policy);
-  if (enum_name == "GATHER_ONCE")
-    return PeerConnectionInterface::GATHER_ONCE;
-
-  if (enum_name == "GATHER_CONTINUALLY")
-    return PeerConnectionInterface::GATHER_CONTINUALLY;
-
-  RTC_CHECK(false) << "Unexpected ContinualGatheringPolicy enum name "
-                   << enum_name;
-  return PeerConnectionInterface::GATHER_ONCE;
-}
-
-static void JavaIceServersToJsepIceServers(
-    JNIEnv* jni, jobject j_ice_servers,
-    PeerConnectionInterface::IceServers* ice_servers) {
-  for (jobject j_ice_server : Iterable(jni, j_ice_servers)) {
-    jclass j_ice_server_class = GetObjectClass(jni, j_ice_server);
-    jfieldID j_ice_server_uri_id =
-        GetFieldID(jni, j_ice_server_class, "uri", "Ljava/lang/String;");
-    jfieldID j_ice_server_username_id =
-        GetFieldID(jni, j_ice_server_class, "username", "Ljava/lang/String;");
-    jfieldID j_ice_server_password_id =
-        GetFieldID(jni, j_ice_server_class, "password", "Ljava/lang/String;");
-    jstring uri = reinterpret_cast<jstring>(
-        GetObjectField(jni, j_ice_server, j_ice_server_uri_id));
-    jstring username = reinterpret_cast<jstring>(
-        GetObjectField(jni, j_ice_server, j_ice_server_username_id));
-    jstring password = reinterpret_cast<jstring>(
-        GetObjectField(jni, j_ice_server, j_ice_server_password_id));
-    PeerConnectionInterface::IceServer server;
-    server.uri = JavaToStdString(jni, uri);
-    server.username = JavaToStdString(jni, username);
-    server.password = JavaToStdString(jni, password);
-    ice_servers->push_back(server);
-  }
-}
-
-static void JavaRTCConfigurationToJsepRTCConfiguration(
-    JNIEnv* jni,
-    jobject j_rtc_config,
-    PeerConnectionInterface::RTCConfiguration* rtc_config) {
-  jclass j_rtc_config_class = GetObjectClass(jni, j_rtc_config);
-
-  jfieldID j_ice_transports_type_id = GetFieldID(
-      jni, j_rtc_config_class, "iceTransportsType",
-      "Lorg/webrtc/PeerConnection$IceTransportsType;");
-  jobject j_ice_transports_type = GetObjectField(
-      jni, j_rtc_config, j_ice_transports_type_id);
-
-  jfieldID j_bundle_policy_id = GetFieldID(
-      jni, j_rtc_config_class, "bundlePolicy",
-      "Lorg/webrtc/PeerConnection$BundlePolicy;");
-  jobject j_bundle_policy = GetObjectField(
-      jni, j_rtc_config, j_bundle_policy_id);
-
-  jfieldID j_rtcp_mux_policy_id = GetFieldID(
-      jni, j_rtc_config_class, "rtcpMuxPolicy",
-      "Lorg/webrtc/PeerConnection$RtcpMuxPolicy;");
-  jobject j_rtcp_mux_policy = GetObjectField(
-      jni, j_rtc_config, j_rtcp_mux_policy_id);
-
-  jfieldID j_tcp_candidate_policy_id = GetFieldID(
-      jni, j_rtc_config_class, "tcpCandidatePolicy",
-      "Lorg/webrtc/PeerConnection$TcpCandidatePolicy;");
-  jobject j_tcp_candidate_policy = GetObjectField(
-      jni, j_rtc_config, j_tcp_candidate_policy_id);
-
-  jfieldID j_candidate_network_policy_id = GetFieldID(
-      jni, j_rtc_config_class, "candidateNetworkPolicy",
-      "Lorg/webrtc/PeerConnection$CandidateNetworkPolicy;");
-  jobject j_candidate_network_policy = GetObjectField(
-      jni, j_rtc_config, j_candidate_network_policy_id);
-
-  jfieldID j_ice_servers_id = GetFieldID(
-      jni, j_rtc_config_class, "iceServers", "Ljava/util/List;");
-  jobject j_ice_servers = GetObjectField(jni, j_rtc_config, j_ice_servers_id);
-
-  jfieldID j_audio_jitter_buffer_max_packets_id =
-      GetFieldID(jni, j_rtc_config_class, "audioJitterBufferMaxPackets", "I");
-  jfieldID j_audio_jitter_buffer_fast_accelerate_id = GetFieldID(
-      jni, j_rtc_config_class, "audioJitterBufferFastAccelerate", "Z");
-
-  jfieldID j_ice_connection_receiving_timeout_id =
-      GetFieldID(jni, j_rtc_config_class, "iceConnectionReceivingTimeout", "I");
-
-  jfieldID j_ice_backup_candidate_pair_ping_interval_id = GetFieldID(
-      jni, j_rtc_config_class, "iceBackupCandidatePairPingInterval", "I");
-
-  jfieldID j_continual_gathering_policy_id =
-      GetFieldID(jni, j_rtc_config_class, "continualGatheringPolicy",
-                 "Lorg/webrtc/PeerConnection$ContinualGatheringPolicy;");
-  jobject j_continual_gathering_policy =
-      GetObjectField(jni, j_rtc_config, j_continual_gathering_policy_id);
-
-  jfieldID j_ice_candidate_pool_size_id =
-      GetFieldID(jni, j_rtc_config_class, "iceCandidatePoolSize", "I");
-
-  rtc_config->type =
-      JavaIceTransportsTypeToNativeType(jni, j_ice_transports_type);
-  rtc_config->bundle_policy =
-      JavaBundlePolicyToNativeType(jni, j_bundle_policy);
-  rtc_config->rtcp_mux_policy =
-      JavaRtcpMuxPolicyToNativeType(jni, j_rtcp_mux_policy);
-  rtc_config->tcp_candidate_policy =
-      JavaTcpCandidatePolicyToNativeType(jni, j_tcp_candidate_policy);
-  rtc_config->candidate_network_policy =
-      JavaCandidateNetworkPolicyToNativeType(jni, j_candidate_network_policy);
-  JavaIceServersToJsepIceServers(jni, j_ice_servers, &rtc_config->servers);
-  rtc_config->audio_jitter_buffer_max_packets =
-      GetIntField(jni, j_rtc_config, j_audio_jitter_buffer_max_packets_id);
-  rtc_config->audio_jitter_buffer_fast_accelerate = GetBooleanField(
-      jni, j_rtc_config, j_audio_jitter_buffer_fast_accelerate_id);
-  rtc_config->ice_connection_receiving_timeout =
-      GetIntField(jni, j_rtc_config, j_ice_connection_receiving_timeout_id);
-  rtc_config->ice_backup_candidate_pair_ping_interval = GetIntField(
-      jni, j_rtc_config, j_ice_backup_candidate_pair_ping_interval_id);
-  rtc_config->continual_gathering_policy =
-      JavaContinualGatheringPolicyToNativeType(
-          jni, j_continual_gathering_policy);
-  rtc_config->ice_candidate_pool_size =
-      GetIntField(jni, j_rtc_config, j_ice_candidate_pool_size_id);
-}
-
-JOW(jlong, PeerConnectionFactory_nativeCreatePeerConnection)(
-    JNIEnv *jni, jclass, jlong factory, jobject j_rtc_config,
-    jobject j_constraints, jlong observer_p) {
-  rtc::scoped_refptr<PeerConnectionFactoryInterface> f(
-      reinterpret_cast<PeerConnectionFactoryInterface*>(
-          factoryFromJava(factory)));
-
-  PeerConnectionInterface::RTCConfiguration rtc_config;
-  JavaRTCConfigurationToJsepRTCConfiguration(jni, j_rtc_config, &rtc_config);
-
-  jclass j_rtc_config_class = GetObjectClass(jni, j_rtc_config);
-  jfieldID j_key_type_id = GetFieldID(jni, j_rtc_config_class, "keyType",
-                                      "Lorg/webrtc/PeerConnection$KeyType;");
-  jobject j_key_type = GetObjectField(jni, j_rtc_config, j_key_type_id);
-
-  // Generate non-default certificate.
-  rtc::KeyType key_type = JavaKeyTypeToNativeType(jni, j_key_type);
-  if (key_type != rtc::KT_DEFAULT) {
-    rtc::scoped_refptr<rtc::RTCCertificate> certificate =
-        rtc::RTCCertificateGenerator::GenerateCertificate(
-            rtc::KeyParams(key_type), rtc::Optional<uint64_t>());
-    if (!certificate) {
-      LOG(LS_ERROR) << "Failed to generate certificate. KeyType: " << key_type;
-      return 0;
-    }
-    rtc_config.certificates.push_back(certificate);
-  }
-
-  PCOJava* observer = reinterpret_cast<PCOJava*>(observer_p);
-  observer->SetConstraints(new ConstraintsWrapper(jni, j_constraints));
-  rtc::scoped_refptr<PeerConnectionInterface> pc(f->CreatePeerConnection(
-      rtc_config, observer->constraints(), NULL, NULL, observer));
-  return (jlong)pc.release();
-}
-
-static rtc::scoped_refptr<PeerConnectionInterface> ExtractNativePC(
-    JNIEnv* jni, jobject j_pc) {
-  jfieldID native_pc_id = GetFieldID(jni,
-      GetObjectClass(jni, j_pc), "nativePeerConnection", "J");
-  jlong j_p = GetLongField(jni, j_pc, native_pc_id);
-  return rtc::scoped_refptr<PeerConnectionInterface>(
-      reinterpret_cast<PeerConnectionInterface*>(j_p));
-}
-
-JOW(jobject, PeerConnection_getLocalDescription)(JNIEnv* jni, jobject j_pc) {
-  const SessionDescriptionInterface* sdp =
-      ExtractNativePC(jni, j_pc)->local_description();
-  return sdp ? JavaSdpFromNativeSdp(jni, sdp) : NULL;
-}
-
-JOW(jobject, PeerConnection_getRemoteDescription)(JNIEnv* jni, jobject j_pc) {
-  const SessionDescriptionInterface* sdp =
-      ExtractNativePC(jni, j_pc)->remote_description();
-  return sdp ? JavaSdpFromNativeSdp(jni, sdp) : NULL;
-}
-
-JOW(jobject, PeerConnection_createDataChannel)(
-    JNIEnv* jni, jobject j_pc, jstring j_label, jobject j_init) {
-  DataChannelInit init = JavaDataChannelInitToNative(jni, j_init);
-  rtc::scoped_refptr<DataChannelInterface> channel(
-      ExtractNativePC(jni, j_pc)->CreateDataChannel(
-          JavaToStdString(jni, j_label), &init));
-  // Mustn't pass channel.get() directly through NewObject to avoid reading its
-  // vararg parameter as 64-bit and reading memory that doesn't belong to the
-  // 32-bit parameter.
-  jlong nativeChannelPtr = jlongFromPointer(channel.get());
-  RTC_CHECK(nativeChannelPtr) << "Failed to create DataChannel";
-  jclass j_data_channel_class = FindClass(jni, "org/webrtc/DataChannel");
-  jmethodID j_data_channel_ctor = GetMethodID(
-      jni, j_data_channel_class, "<init>", "(J)V");
-  jobject j_channel = jni->NewObject(
-      j_data_channel_class, j_data_channel_ctor, nativeChannelPtr);
-  CHECK_EXCEPTION(jni) << "error during NewObject";
-  // Channel is now owned by Java object, and will be freed from there.
-  int bumped_count = channel->AddRef();
-  RTC_CHECK(bumped_count == 2) << "Unexpected refcount";
-  return j_channel;
-}
-
-JOW(void, PeerConnection_createOffer)(
-    JNIEnv* jni, jobject j_pc, jobject j_observer, jobject j_constraints) {
-  ConstraintsWrapper* constraints =
-      new ConstraintsWrapper(jni, j_constraints);
-  rtc::scoped_refptr<CreateSdpObserverWrapper> observer(
-      new rtc::RefCountedObject<CreateSdpObserverWrapper>(
-          jni, j_observer, constraints));
-  ExtractNativePC(jni, j_pc)->CreateOffer(observer, constraints);
-}
-
-JOW(void, PeerConnection_createAnswer)(
-    JNIEnv* jni, jobject j_pc, jobject j_observer, jobject j_constraints) {
-  ConstraintsWrapper* constraints =
-      new ConstraintsWrapper(jni, j_constraints);
-  rtc::scoped_refptr<CreateSdpObserverWrapper> observer(
-      new rtc::RefCountedObject<CreateSdpObserverWrapper>(
-          jni, j_observer, constraints));
-  ExtractNativePC(jni, j_pc)->CreateAnswer(observer, constraints);
-}
-
-// Helper to create a SessionDescriptionInterface from a SessionDescription.
-static SessionDescriptionInterface* JavaSdpToNativeSdp(
-    JNIEnv* jni, jobject j_sdp) {
-  jfieldID j_type_id = GetFieldID(
-      jni, GetObjectClass(jni, j_sdp), "type",
-      "Lorg/webrtc/SessionDescription$Type;");
-  jobject j_type = GetObjectField(jni, j_sdp, j_type_id);
-  jmethodID j_canonical_form_id = GetMethodID(
-      jni, GetObjectClass(jni, j_type), "canonicalForm",
-      "()Ljava/lang/String;");
-  jstring j_type_string = (jstring)jni->CallObjectMethod(
-      j_type, j_canonical_form_id);
-  CHECK_EXCEPTION(jni) << "error during CallObjectMethod";
-  std::string std_type = JavaToStdString(jni, j_type_string);
-
-  jfieldID j_description_id = GetFieldID(
-      jni, GetObjectClass(jni, j_sdp), "description", "Ljava/lang/String;");
-  jstring j_description = (jstring)GetObjectField(jni, j_sdp, j_description_id);
-  std::string std_description = JavaToStdString(jni, j_description);
-
-  return webrtc::CreateSessionDescription(
-      std_type, std_description, NULL);
-}
-
-JOW(void, PeerConnection_setLocalDescription)(
-    JNIEnv* jni, jobject j_pc,
-    jobject j_observer, jobject j_sdp) {
-  rtc::scoped_refptr<SetSdpObserverWrapper> observer(
-      new rtc::RefCountedObject<SetSdpObserverWrapper>(
-          jni, j_observer, reinterpret_cast<ConstraintsWrapper*>(NULL)));
-  ExtractNativePC(jni, j_pc)->SetLocalDescription(
-      observer, JavaSdpToNativeSdp(jni, j_sdp));
-}
-
-JOW(void, PeerConnection_setRemoteDescription)(
-    JNIEnv* jni, jobject j_pc,
-    jobject j_observer, jobject j_sdp) {
-  rtc::scoped_refptr<SetSdpObserverWrapper> observer(
-      new rtc::RefCountedObject<SetSdpObserverWrapper>(
-          jni, j_observer, reinterpret_cast<ConstraintsWrapper*>(NULL)));
-  ExtractNativePC(jni, j_pc)->SetRemoteDescription(
-      observer, JavaSdpToNativeSdp(jni, j_sdp));
-}
-
-JOW(jboolean, PeerConnection_setConfiguration)(
-    JNIEnv* jni, jobject j_pc, jobject j_rtc_config) {
-  PeerConnectionInterface::RTCConfiguration rtc_config;
-  JavaRTCConfigurationToJsepRTCConfiguration(jni, j_rtc_config, &rtc_config);
-  return ExtractNativePC(jni, j_pc)->SetConfiguration(rtc_config);
-}
-
-JOW(jboolean, PeerConnection_nativeAddIceCandidate)(
-    JNIEnv* jni, jobject j_pc, jstring j_sdp_mid,
-    jint j_sdp_mline_index, jstring j_candidate_sdp) {
-  std::string sdp_mid = JavaToStdString(jni, j_sdp_mid);
-  std::string sdp = JavaToStdString(jni, j_candidate_sdp);
-  std::unique_ptr<IceCandidateInterface> candidate(
-      webrtc::CreateIceCandidate(sdp_mid, j_sdp_mline_index, sdp, NULL));
-  return ExtractNativePC(jni, j_pc)->AddIceCandidate(candidate.get());
-}
-
-static cricket::Candidate GetCandidateFromJava(JNIEnv* jni,
-                                               jobject j_candidate) {
-  jclass j_candidate_class = GetObjectClass(jni, j_candidate);
-  jfieldID j_sdp_mid_id =
-      GetFieldID(jni, j_candidate_class, "sdpMid", "Ljava/lang/String;");
-  std::string sdp_mid =
-      JavaToStdString(jni, GetStringField(jni, j_candidate, j_sdp_mid_id));
-  jfieldID j_sdp_id =
-      GetFieldID(jni, j_candidate_class, "sdp", "Ljava/lang/String;");
-  std::string sdp =
-      JavaToStdString(jni, GetStringField(jni, j_candidate, j_sdp_id));
-  cricket::Candidate candidate;
-  if (!webrtc::SdpDeserializeCandidate(sdp_mid, sdp, &candidate, NULL)) {
-    LOG(LS_ERROR) << "SdpDescrializeCandidate failed with sdp " << sdp;
-  }
-  return candidate;
-}
-
-JOW(jboolean, PeerConnection_nativeRemoveIceCandidates)
-(JNIEnv* jni, jobject j_pc, jobjectArray j_candidates) {
-  std::vector<cricket::Candidate> candidates;
-  size_t num_candidates = jni->GetArrayLength(j_candidates);
-  for (size_t i = 0; i < num_candidates; ++i) {
-    jobject j_candidate = jni->GetObjectArrayElement(j_candidates, i);
-    candidates.push_back(GetCandidateFromJava(jni, j_candidate));
-  }
-  return ExtractNativePC(jni, j_pc)->RemoveIceCandidates(candidates);
-}
-
-JOW(jboolean, PeerConnection_nativeAddLocalStream)(
-    JNIEnv* jni, jobject j_pc, jlong native_stream) {
-  return ExtractNativePC(jni, j_pc)->AddStream(
-      reinterpret_cast<MediaStreamInterface*>(native_stream));
-}
-
-JOW(void, PeerConnection_nativeRemoveLocalStream)(
-    JNIEnv* jni, jobject j_pc, jlong native_stream) {
-  ExtractNativePC(jni, j_pc)->RemoveStream(
-      reinterpret_cast<MediaStreamInterface*>(native_stream));
-}
-
-JOW(jobject, PeerConnection_nativeCreateSender)(
-    JNIEnv* jni, jobject j_pc, jstring j_kind, jstring j_stream_id) {
-  jclass j_rtp_sender_class = FindClass(jni, "org/webrtc/RtpSender");
-  jmethodID j_rtp_sender_ctor =
-      GetMethodID(jni, j_rtp_sender_class, "<init>", "(J)V");
-
-  std::string kind = JavaToStdString(jni, j_kind);
-  std::string stream_id = JavaToStdString(jni, j_stream_id);
-  rtc::scoped_refptr<RtpSenderInterface> sender =
-      ExtractNativePC(jni, j_pc)->CreateSender(kind, stream_id);
-  if (!sender.get()) {
-    return nullptr;
-  }
-  jlong nativeSenderPtr = jlongFromPointer(sender.get());
-  jobject j_sender =
-      jni->NewObject(j_rtp_sender_class, j_rtp_sender_ctor, nativeSenderPtr);
-  CHECK_EXCEPTION(jni) << "error during NewObject";
-  // Sender is now owned by the Java object, and will be freed from
-  // RtpSender.dispose(), called by PeerConnection.dispose() or getSenders().
-  sender->AddRef();
-  return j_sender;
-}
-
-JOW(jobject, PeerConnection_nativeGetSenders)(JNIEnv* jni, jobject j_pc) {
-  jclass j_array_list_class = FindClass(jni, "java/util/ArrayList");
-  jmethodID j_array_list_ctor =
-      GetMethodID(jni, j_array_list_class, "<init>", "()V");
-  jmethodID j_array_list_add =
-      GetMethodID(jni, j_array_list_class, "add", "(Ljava/lang/Object;)Z");
-  jobject j_senders = jni->NewObject(j_array_list_class, j_array_list_ctor);
-  CHECK_EXCEPTION(jni) << "error during NewObject";
-
-  jclass j_rtp_sender_class = FindClass(jni, "org/webrtc/RtpSender");
-  jmethodID j_rtp_sender_ctor =
-      GetMethodID(jni, j_rtp_sender_class, "<init>", "(J)V");
-
-  auto senders = ExtractNativePC(jni, j_pc)->GetSenders();
-  for (const auto& sender : senders) {
-    jlong nativeSenderPtr = jlongFromPointer(sender.get());
-    jobject j_sender =
-        jni->NewObject(j_rtp_sender_class, j_rtp_sender_ctor, nativeSenderPtr);
-    CHECK_EXCEPTION(jni) << "error during NewObject";
-    // Sender is now owned by the Java object, and will be freed from
-    // RtpSender.dispose(), called by PeerConnection.dispose() or getSenders().
-    sender->AddRef();
-    jni->CallBooleanMethod(j_senders, j_array_list_add, j_sender);
-    CHECK_EXCEPTION(jni) << "error during CallBooleanMethod";
-  }
-  return j_senders;
-}
-
-JOW(jobject, PeerConnection_nativeGetReceivers)(JNIEnv* jni, jobject j_pc) {
-  jclass j_array_list_class = FindClass(jni, "java/util/ArrayList");
-  jmethodID j_array_list_ctor =
-      GetMethodID(jni, j_array_list_class, "<init>", "()V");
-  jmethodID j_array_list_add =
-      GetMethodID(jni, j_array_list_class, "add", "(Ljava/lang/Object;)Z");
-  jobject j_receivers = jni->NewObject(j_array_list_class, j_array_list_ctor);
-  CHECK_EXCEPTION(jni) << "error during NewObject";
-
-  jclass j_rtp_receiver_class = FindClass(jni, "org/webrtc/RtpReceiver");
-  jmethodID j_rtp_receiver_ctor =
-      GetMethodID(jni, j_rtp_receiver_class, "<init>", "(J)V");
-
-  auto receivers = ExtractNativePC(jni, j_pc)->GetReceivers();
-  for (const auto& receiver : receivers) {
-    jlong nativeReceiverPtr = jlongFromPointer(receiver.get());
-    jobject j_receiver = jni->NewObject(j_rtp_receiver_class,
-                                        j_rtp_receiver_ctor, nativeReceiverPtr);
-    CHECK_EXCEPTION(jni) << "error during NewObject";
-    // Receiver is now owned by Java object, and will be freed from there.
-    receiver->AddRef();
-    jni->CallBooleanMethod(j_receivers, j_array_list_add, j_receiver);
-    CHECK_EXCEPTION(jni) << "error during CallBooleanMethod";
-  }
-  return j_receivers;
-}
-
-JOW(bool, PeerConnection_nativeGetStats)(
-    JNIEnv* jni, jobject j_pc, jobject j_observer, jlong native_track) {
-  rtc::scoped_refptr<StatsObserverWrapper> observer(
-      new rtc::RefCountedObject<StatsObserverWrapper>(jni, j_observer));
-  return ExtractNativePC(jni, j_pc)->GetStats(
-      observer,
-      reinterpret_cast<MediaStreamTrackInterface*>(native_track),
-      PeerConnectionInterface::kStatsOutputLevelStandard);
-}
-
-JOW(jobject, PeerConnection_signalingState)(JNIEnv* jni, jobject j_pc) {
-  PeerConnectionInterface::SignalingState state =
-      ExtractNativePC(jni, j_pc)->signaling_state();
-  return JavaEnumFromIndex(jni, "PeerConnection$SignalingState", state);
-}
-
-JOW(jobject, PeerConnection_iceConnectionState)(JNIEnv* jni, jobject j_pc) {
-  PeerConnectionInterface::IceConnectionState state =
-      ExtractNativePC(jni, j_pc)->ice_connection_state();
-  return JavaEnumFromIndex(jni, "PeerConnection$IceConnectionState", state);
-}
-
-JOW(jobject, PeerConnection_iceGatheringState)(JNIEnv* jni, jobject j_pc) {
-  PeerConnectionInterface::IceGatheringState state =
-      ExtractNativePC(jni, j_pc)->ice_gathering_state();
-  return JavaEnumFromIndex(jni, "PeerConnection$IceGatheringState", state);
-}
-
-JOW(void, PeerConnection_close)(JNIEnv* jni, jobject j_pc) {
-  ExtractNativePC(jni, j_pc)->Close();
-  return;
-}
-
-JOW(jobject, MediaSource_nativeState)(JNIEnv* jni, jclass, jlong j_p) {
-  rtc::scoped_refptr<MediaSourceInterface> p(
-      reinterpret_cast<MediaSourceInterface*>(j_p));
-  return JavaEnumFromIndex(jni, "MediaSource$State", p->state());
-}
-
-JOW(jlong, VideoRenderer_nativeWrapVideoRenderer)(
-    JNIEnv* jni, jclass, jobject j_callbacks) {
-  std::unique_ptr<JavaVideoRendererWrapper> renderer(
-      new JavaVideoRendererWrapper(jni, j_callbacks));
-  return (jlong)renderer.release();
-}
-
-JOW(void, VideoRenderer_nativeCopyPlane)(
-    JNIEnv *jni, jclass, jobject j_src_buffer, jint width, jint height,
-    jint src_stride, jobject j_dst_buffer, jint dst_stride) {
-  size_t src_size = jni->GetDirectBufferCapacity(j_src_buffer);
-  size_t dst_size = jni->GetDirectBufferCapacity(j_dst_buffer);
-  RTC_CHECK(src_stride >= width) << "Wrong source stride " << src_stride;
-  RTC_CHECK(dst_stride >= width) << "Wrong destination stride " << dst_stride;
-  RTC_CHECK(src_size >= src_stride * height)
-      << "Insufficient source buffer capacity " << src_size;
-  RTC_CHECK(dst_size >= dst_stride * height)
-      << "Insufficient destination buffer capacity " << dst_size;
-  uint8_t *src =
-      reinterpret_cast<uint8_t*>(jni->GetDirectBufferAddress(j_src_buffer));
-  uint8_t *dst =
-      reinterpret_cast<uint8_t*>(jni->GetDirectBufferAddress(j_dst_buffer));
-  if (src_stride == dst_stride) {
-    memcpy(dst, src, src_stride * height);
-  } else {
-    for (int i = 0; i < height; i++) {
-      memcpy(dst, src, width);
-      src += src_stride;
-      dst += dst_stride;
-    }
-  }
-}
-
-JOW(void, VideoSource_stop)(JNIEnv* jni, jclass, jlong j_p) {
-  reinterpret_cast<VideoTrackSourceInterface*>(j_p)->Stop();
-}
-
-JOW(void, VideoSource_restart)(
-    JNIEnv* jni, jclass, jlong j_p_source, jlong j_p_format) {
-  reinterpret_cast<VideoTrackSourceInterface*>(j_p_source)->Restart();
-}
-
-JOW(jstring, MediaStreamTrack_nativeId)(JNIEnv* jni, jclass, jlong j_p) {
-  return JavaStringFromStdString(
-      jni, reinterpret_cast<MediaStreamTrackInterface*>(j_p)->id());
-}
-
-JOW(jstring, MediaStreamTrack_nativeKind)(JNIEnv* jni, jclass, jlong j_p) {
-  return JavaStringFromStdString(
-      jni, reinterpret_cast<MediaStreamTrackInterface*>(j_p)->kind());
-}
-
-JOW(jboolean, MediaStreamTrack_nativeEnabled)(JNIEnv* jni, jclass, jlong j_p) {
-  return reinterpret_cast<MediaStreamTrackInterface*>(j_p)->enabled();
-}
-
-JOW(jobject, MediaStreamTrack_nativeState)(JNIEnv* jni, jclass, jlong j_p) {
-  return JavaEnumFromIndex(
-      jni,
-      "MediaStreamTrack$State",
-      reinterpret_cast<MediaStreamTrackInterface*>(j_p)->state());
-}
-
-JOW(jboolean, MediaStreamTrack_nativeSetEnabled)(
-    JNIEnv* jni, jclass, jlong j_p, jboolean enabled) {
-  return reinterpret_cast<MediaStreamTrackInterface*>(j_p)
-      ->set_enabled(enabled);
-}
-
-JOW(void, VideoTrack_nativeAddRenderer)(
-    JNIEnv* jni, jclass,
-    jlong j_video_track_pointer, jlong j_renderer_pointer) {
-  reinterpret_cast<VideoTrackInterface*>(j_video_track_pointer)
-      ->AddOrUpdateSink(
-          reinterpret_cast<rtc::VideoSinkInterface<cricket::VideoFrame>*>(
-              j_renderer_pointer),
-          rtc::VideoSinkWants());
-}
-
-JOW(void, VideoTrack_nativeRemoveRenderer)(
-    JNIEnv* jni, jclass,
-    jlong j_video_track_pointer, jlong j_renderer_pointer) {
-  reinterpret_cast<VideoTrackInterface*>(j_video_track_pointer)
-      ->RemoveSink(
-          reinterpret_cast<rtc::VideoSinkInterface<cricket::VideoFrame>*>(
-              j_renderer_pointer));
-}
-
-JOW(jlong, CallSessionFileRotatingLogSink_nativeAddSink)(
-    JNIEnv* jni, jclass,
-    jstring j_dirPath, jint j_maxFileSize, jint j_severity) {
-  std::string dir_path = JavaToStdString(jni, j_dirPath);
-  rtc::CallSessionFileRotatingLogSink* sink =
-      new rtc::CallSessionFileRotatingLogSink(dir_path, j_maxFileSize);
-  if (!sink->Init()) {
-    LOG_V(rtc::LoggingSeverity::LS_WARNING) <<
-        "Failed to init CallSessionFileRotatingLogSink for path " << dir_path;
-    delete sink;
-    return 0;
-  }
-  rtc::LogMessage::AddLogToStream(
-      sink, static_cast<rtc::LoggingSeverity>(j_severity));
-  return (jlong) sink;
-}
-
-JOW(void, CallSessionFileRotatingLogSink_nativeDeleteSink)(
-    JNIEnv* jni, jclass, jlong j_sink) {
-  rtc::CallSessionFileRotatingLogSink* sink =
-      reinterpret_cast<rtc::CallSessionFileRotatingLogSink*>(j_sink);
-  rtc::LogMessage::RemoveLogToStream(sink);
-  delete sink;
-}
-
-JOW(jbyteArray, CallSessionFileRotatingLogSink_nativeGetLogData)(
-    JNIEnv* jni, jclass, jstring j_dirPath) {
-  std::string dir_path = JavaToStdString(jni, j_dirPath);
-  std::unique_ptr<rtc::CallSessionFileRotatingStream> stream(
-      new rtc::CallSessionFileRotatingStream(dir_path));
-  if (!stream->Open()) {
-    LOG_V(rtc::LoggingSeverity::LS_WARNING) <<
-        "Failed to open CallSessionFileRotatingStream for path " << dir_path;
-    return jni->NewByteArray(0);
-  }
-  size_t log_size = 0;
-  if (!stream->GetSize(&log_size) || log_size == 0) {
-    LOG_V(rtc::LoggingSeverity::LS_WARNING) <<
-        "CallSessionFileRotatingStream returns 0 size for path " << dir_path;
-    return jni->NewByteArray(0);
-  }
-
-  size_t read = 0;
-  std::unique_ptr<jbyte> buffer(static_cast<jbyte*>(malloc(log_size)));
-  stream->ReadAll(buffer.get(), log_size, &read, nullptr);
-
-  jbyteArray result = jni->NewByteArray(read);
-  jni->SetByteArrayRegion(result, 0, read, buffer.get());
-
-  return result;
-}
-
-JOW(jboolean, RtpSender_nativeSetTrack)(JNIEnv* jni,
-                                    jclass,
-                                    jlong j_rtp_sender_pointer,
-                                    jlong j_track_pointer) {
-  return reinterpret_cast<RtpSenderInterface*>(j_rtp_sender_pointer)
-      ->SetTrack(reinterpret_cast<MediaStreamTrackInterface*>(j_track_pointer));
-}
-
-JOW(jlong, RtpSender_nativeGetTrack)(JNIEnv* jni,
-                                  jclass,
-                                  jlong j_rtp_sender_pointer,
-                                  jlong j_track_pointer) {
-  return jlongFromPointer(
-      reinterpret_cast<RtpSenderInterface*>(j_rtp_sender_pointer)
-          ->track()
-          .release());
-}
-
-static void JavaRtpParametersToJsepRtpParameters(
-    JNIEnv* jni,
-    jobject j_parameters,
-    webrtc::RtpParameters* parameters) {
-  RTC_CHECK(parameters != nullptr);
-  jclass parameters_class = jni->FindClass("org/webrtc/RtpParameters");
-  jfieldID encodings_id =
-      GetFieldID(jni, parameters_class, "encodings", "Ljava/util/LinkedList;");
-  jfieldID codecs_id =
-      GetFieldID(jni, parameters_class, "codecs", "Ljava/util/LinkedList;");
-
-  // Convert encodings.
-  jobject j_encodings = GetObjectField(jni, j_parameters, encodings_id);
-  const int kBitrateUnlimited = -1;
-  jclass j_encoding_parameters_class =
-      jni->FindClass("org/webrtc/RtpParameters$Encoding");
-  jfieldID active_id =
-      GetFieldID(jni, j_encoding_parameters_class, "active", "Z");
-  jfieldID bitrate_id = GetFieldID(jni, j_encoding_parameters_class,
-                                   "maxBitrateBps", "Ljava/lang/Integer;");
-  jclass j_integer_class = jni->FindClass("java/lang/Integer");
-  jmethodID int_value_id = GetMethodID(jni, j_integer_class, "intValue", "()I");
-
-  for (jobject j_encoding_parameters : Iterable(jni, j_encodings)) {
-    webrtc::RtpEncodingParameters encoding;
-    encoding.active = GetBooleanField(jni, j_encoding_parameters, active_id);
-    jobject j_bitrate =
-        GetNullableObjectField(jni, j_encoding_parameters, bitrate_id);
-    if (!IsNull(jni, j_bitrate)) {
-      int bitrate_value = jni->CallIntMethod(j_bitrate, int_value_id);
-      CHECK_EXCEPTION(jni) << "error during CallIntMethod";
-      encoding.max_bitrate_bps = bitrate_value;
-    } else {
-      encoding.max_bitrate_bps = kBitrateUnlimited;
-    }
-    parameters->encodings.push_back(encoding);
-  }
-
-  // Convert codecs.
-  jobject j_codecs = GetObjectField(jni, j_parameters, codecs_id);
-  jclass codec_class = jni->FindClass("org/webrtc/RtpParameters$Codec");
-  jfieldID payload_type_id = GetFieldID(jni, codec_class, "payloadType", "I");
-  jfieldID mime_type_id =
-      GetFieldID(jni, codec_class, "mimeType", "Ljava/lang/String;");
-  jfieldID clock_rate_id = GetFieldID(jni, codec_class, "clockRate", "I");
-  jfieldID channels_id = GetFieldID(jni, codec_class, "channels", "I");
-
-  for (jobject j_codec : Iterable(jni, j_codecs)) {
-    webrtc::RtpCodecParameters codec;
-    codec.payload_type = GetIntField(jni, j_codec, payload_type_id);
-    codec.mime_type =
-        JavaToStdString(jni, GetStringField(jni, j_codec, mime_type_id));
-    codec.clock_rate = GetIntField(jni, j_codec, clock_rate_id);
-    codec.channels = GetIntField(jni, j_codec, channels_id);
-    parameters->codecs.push_back(codec);
-  }
-}
-
-static jobject JsepRtpParametersToJavaRtpParameters(
-    JNIEnv* jni,
-    const webrtc::RtpParameters& parameters) {
-  jclass parameters_class = jni->FindClass("org/webrtc/RtpParameters");
-  jmethodID parameters_ctor =
-      GetMethodID(jni, parameters_class, "<init>", "()V");
-  jobject j_parameters = jni->NewObject(parameters_class, parameters_ctor);
-  CHECK_EXCEPTION(jni) << "error during NewObject";
-
-  // Add encodings.
-  jclass encoding_class = jni->FindClass("org/webrtc/RtpParameters$Encoding");
-  jmethodID encoding_ctor = GetMethodID(jni, encoding_class, "<init>", "()V");
-  jfieldID encodings_id =
-      GetFieldID(jni, parameters_class, "encodings", "Ljava/util/LinkedList;");
-  jobject j_encodings = GetObjectField(jni, j_parameters, encodings_id);
-  jmethodID encodings_add = GetMethodID(jni, GetObjectClass(jni, j_encodings),
-                                        "add", "(Ljava/lang/Object;)Z");
-  jfieldID active_id =
-      GetFieldID(jni, encoding_class, "active", "Z");
-  jfieldID bitrate_id =
-      GetFieldID(jni, encoding_class, "maxBitrateBps", "Ljava/lang/Integer;");
-
-  jclass integer_class = jni->FindClass("java/lang/Integer");
-  jmethodID integer_ctor = GetMethodID(jni, integer_class, "<init>", "(I)V");
-
-  for (const webrtc::RtpEncodingParameters& encoding : parameters.encodings) {
-    jobject j_encoding_parameters =
-        jni->NewObject(encoding_class, encoding_ctor);
-    CHECK_EXCEPTION(jni) << "error during NewObject";
-    jni->SetBooleanField(j_encoding_parameters, active_id, encoding.active);
-    CHECK_EXCEPTION(jni) << "error during SetBooleanField";
-    if (encoding.max_bitrate_bps > 0) {
-      jobject j_bitrate_value =
-          jni->NewObject(integer_class, integer_ctor, encoding.max_bitrate_bps);
-      CHECK_EXCEPTION(jni) << "error during NewObject";
-      jni->SetObjectField(j_encoding_parameters, bitrate_id, j_bitrate_value);
-      CHECK_EXCEPTION(jni) << "error during SetObjectField";
-    }
-    jboolean added = jni->CallBooleanMethod(j_encodings, encodings_add,
-                                            j_encoding_parameters);
-    CHECK_EXCEPTION(jni) << "error during CallBooleanMethod";
-    RTC_CHECK(added);
-  }
-
-  // Add codecs.
-  jclass codec_class = jni->FindClass("org/webrtc/RtpParameters$Codec");
-  jmethodID codec_ctor = GetMethodID(jni, codec_class, "<init>", "()V");
-  jfieldID codecs_id =
-      GetFieldID(jni, parameters_class, "codecs", "Ljava/util/LinkedList;");
-  jobject j_codecs = GetObjectField(jni, j_parameters, codecs_id);
-  jmethodID codecs_add = GetMethodID(jni, GetObjectClass(jni, j_codecs),
-                                     "add", "(Ljava/lang/Object;)Z");
-  jfieldID payload_type_id = GetFieldID(jni, codec_class, "payloadType", "I");
-  jfieldID mime_type_id =
-      GetFieldID(jni, codec_class, "mimeType", "Ljava/lang/String;");
-  jfieldID clock_rate_id = GetFieldID(jni, codec_class, "clockRate", "I");
-  jfieldID channels_id = GetFieldID(jni, codec_class, "channels", "I");
-
-  for (const webrtc::RtpCodecParameters& codec : parameters.codecs) {
-    jobject j_codec = jni->NewObject(codec_class, codec_ctor);
-    CHECK_EXCEPTION(jni) << "error during NewObject";
-    jni->SetIntField(j_codec, payload_type_id, codec.payload_type);
-    CHECK_EXCEPTION(jni) << "error during SetIntField";
-    jni->SetObjectField(j_codec, mime_type_id,
-                        JavaStringFromStdString(jni, codec.mime_type));
-    CHECK_EXCEPTION(jni) << "error during SetObjectField";
-    jni->SetIntField(j_codec, clock_rate_id, codec.clock_rate);
-    CHECK_EXCEPTION(jni) << "error during SetIntField";
-    jni->SetIntField(j_codec, channels_id, codec.channels);
-    CHECK_EXCEPTION(jni) << "error during SetIntField";
-    jboolean added = jni->CallBooleanMethod(j_codecs, codecs_add, j_codec);
-    CHECK_EXCEPTION(jni) << "error during CallBooleanMethod";
-    RTC_CHECK(added);
-  }
-
-  return j_parameters;
-}
-
-JOW(jboolean, RtpSender_nativeSetParameters)
-(JNIEnv* jni, jclass, jlong j_rtp_sender_pointer, jobject j_parameters) {
-  if (IsNull(jni, j_parameters)) {
-    return false;
-  }
-  webrtc::RtpParameters parameters;
-  JavaRtpParametersToJsepRtpParameters(jni, j_parameters, &parameters);
-  return reinterpret_cast<RtpSenderInterface*>(j_rtp_sender_pointer)
-      ->SetParameters(parameters);
-}
-
-JOW(jobject, RtpSender_nativeGetParameters)
-(JNIEnv* jni, jclass, jlong j_rtp_sender_pointer) {
-  webrtc::RtpParameters parameters =
-      reinterpret_cast<RtpSenderInterface*>(j_rtp_sender_pointer)
-          ->GetParameters();
-  return JsepRtpParametersToJavaRtpParameters(jni, parameters);
-}
-
-JOW(jstring, RtpSender_nativeId)(
-    JNIEnv* jni, jclass, jlong j_rtp_sender_pointer) {
-  return JavaStringFromStdString(
-      jni, reinterpret_cast<RtpSenderInterface*>(j_rtp_sender_pointer)->id());
-}
-
-JOW(void, RtpSender_free)(JNIEnv* jni, jclass, jlong j_rtp_sender_pointer) {
-  reinterpret_cast<RtpSenderInterface*>(j_rtp_sender_pointer)->Release();
-}
-
-JOW(jlong, RtpReceiver_nativeGetTrack)(JNIEnv* jni,
-                                    jclass,
-                                    jlong j_rtp_receiver_pointer,
-                                    jlong j_track_pointer) {
-  return jlongFromPointer(
-      reinterpret_cast<RtpReceiverInterface*>(j_rtp_receiver_pointer)
-          ->track()
-          .release());
-}
-
-JOW(jboolean, RtpReceiver_nativeSetParameters)
-(JNIEnv* jni, jclass, jlong j_rtp_sender_pointer, jobject j_parameters) {
-  if (IsNull(jni, j_parameters)) {
-    return false;
-  }
-  webrtc::RtpParameters parameters;
-  JavaRtpParametersToJsepRtpParameters(jni, j_parameters, &parameters);
-  return reinterpret_cast<RtpReceiverInterface*>(j_rtp_sender_pointer)
-      ->SetParameters(parameters);
-}
-
-JOW(jobject, RtpReceiver_nativeGetParameters)
-(JNIEnv* jni, jclass, jlong j_rtp_sender_pointer) {
-  webrtc::RtpParameters parameters =
-      reinterpret_cast<RtpReceiverInterface*>(j_rtp_sender_pointer)
-          ->GetParameters();
-  return JsepRtpParametersToJavaRtpParameters(jni, parameters);
-}
-
-JOW(jstring, RtpReceiver_nativeId)(
-    JNIEnv* jni, jclass, jlong j_rtp_receiver_pointer) {
-  return JavaStringFromStdString(
-      jni,
-      reinterpret_cast<RtpReceiverInterface*>(j_rtp_receiver_pointer)->id());
-}
-
-JOW(void, RtpReceiver_free)(JNIEnv* jni, jclass, jlong j_rtp_receiver_pointer) {
-  reinterpret_cast<RtpReceiverInterface*>(j_rtp_receiver_pointer)->Release();
-}
-
-}  // namespace webrtc_jni