sdk/android/api/org/webrtc/PeerConnectionFactory.java

/*
 *  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.
 */

package org.webrtc;

import android.content.Context;
import android.os.Process;
import androidx.annotation.Nullable;
import java.util.List;
import org.webrtc.Logging.Severity;
import org.webrtc.audio.AudioDeviceModule;
import org.webrtc.audio.JavaAudioDeviceModule;

/**
 * Java wrapper for a C++ PeerConnectionFactoryInterface.  Main entry point to
 * the PeerConnection API for clients.
 */
public class PeerConnectionFactory {
  public static final String TRIAL_ENABLED = "Enabled";
  @Deprecated public static final String VIDEO_FRAME_EMIT_TRIAL = "VideoFrameEmit";

  private static final String TAG = "PeerConnectionFactory";
  private static final String VIDEO_CAPTURER_THREAD_NAME = "VideoCapturerThread";

  /** Helper class holding both Java and C++ thread info. */
  private static class ThreadInfo {
    final Thread thread;
    final int tid;

    public static ThreadInfo getCurrent() {
      return new ThreadInfo(Thread.currentThread(), Process.myTid());
    }

    private ThreadInfo(Thread thread, int tid) {
      this.thread = thread;
      this.tid = tid;
    }
  }

  private static volatile boolean internalTracerInitialized;

  // Remove these once deprecated static printStackTrace() is gone.
  @Nullable private static ThreadInfo staticNetworkThread;
  @Nullable private static ThreadInfo staticWorkerThread;
  @Nullable private static ThreadInfo staticSignalingThread;

  private long nativeFactory;
  @Nullable private volatile ThreadInfo networkThread;
  @Nullable private volatile ThreadInfo workerThread;
  @Nullable private volatile ThreadInfo signalingThread;

  public static class InitializationOptions {
    final Context applicationContext;
    final String fieldTrials;
    final boolean enableInternalTracer;
    final NativeLibraryLoader nativeLibraryLoader;
    final String nativeLibraryName;
    @Nullable Loggable loggable;
    @Nullable Severity loggableSeverity;

    private InitializationOptions(Context applicationContext, String fieldTrials,
        boolean enableInternalTracer, NativeLibraryLoader nativeLibraryLoader,
        String nativeLibraryName, @Nullable Loggable loggable,
        @Nullable Severity loggableSeverity) {
      this.applicationContext = applicationContext;
      this.fieldTrials = fieldTrials;
      this.enableInternalTracer = enableInternalTracer;
      this.nativeLibraryLoader = nativeLibraryLoader;
      this.nativeLibraryName = nativeLibraryName;
      this.loggable = loggable;
      this.loggableSeverity = loggableSeverity;
    }

    public static Builder builder(Context applicationContext) {
      return new Builder(applicationContext);
    }

    public static class Builder {
      private final Context applicationContext;
      private String fieldTrials = "";
      private boolean enableInternalTracer;
      private NativeLibraryLoader nativeLibraryLoader = new NativeLibrary.DefaultLoader();
      private String nativeLibraryName = "jingle_peerconnection_so";
      @Nullable private Loggable loggable;
      @Nullable private Severity loggableSeverity;

      Builder(Context applicationContext) {
        this.applicationContext = applicationContext;
      }

      // Deprecated, use PeerConnectionFactory.Builder.setFieldTrials instead.
      // TODO: bugs.webrtc.org/42220378 - Delete after January 1, 2026.
      @Deprecated
      public Builder setFieldTrials(String fieldTrials) {
        this.fieldTrials = fieldTrials;
        return this;
      }

      public Builder setEnableInternalTracer(boolean enableInternalTracer) {
        this.enableInternalTracer = enableInternalTracer;
        return this;
      }

      public Builder setNativeLibraryLoader(NativeLibraryLoader nativeLibraryLoader) {
        this.nativeLibraryLoader = nativeLibraryLoader;
        return this;
      }

      public Builder setNativeLibraryName(String nativeLibraryName) {
        this.nativeLibraryName = nativeLibraryName;
        return this;
      }

      public Builder setInjectableLogger(Loggable loggable, Severity severity) {
        this.loggable = loggable;
        this.loggableSeverity = severity;
        return this;
      }

      public PeerConnectionFactory.InitializationOptions createInitializationOptions() {
        return new PeerConnectionFactory.InitializationOptions(applicationContext, fieldTrials,
            enableInternalTracer, nativeLibraryLoader, nativeLibraryName, loggable,
            loggableSeverity);
      }
    }
  }

  public static class Options {
    // Keep in sync with webrtc/rtc_base/network.h!
    //
    // These bit fields are defined for `networkIgnoreMask` below.
    public static final int ADAPTER_TYPE_UNKNOWN = 0;
    public static final int ADAPTER_TYPE_ETHERNET = 1 << 0;
    public static final int ADAPTER_TYPE_WIFI = 1 << 1;
    public static final int ADAPTER_TYPE_CELLULAR = 1 << 2;
    public static final int ADAPTER_TYPE_VPN = 1 << 3;
    public static final int ADAPTER_TYPE_LOOPBACK = 1 << 4;
    public static final int ADAPTER_TYPE_ANY = 1 << 5;

    public int networkIgnoreMask;
    public boolean disableEncryption;
    public boolean disableNetworkMonitor;

    @CalledByNative("Options")
    int getNetworkIgnoreMask() {
      return networkIgnoreMask;
    }

    @CalledByNative("Options")
    boolean getDisableEncryption() {
      return disableEncryption;
    }

    @CalledByNative("Options")
    boolean getDisableNetworkMonitor() {
      return disableNetworkMonitor;
    }
  }

  public static class Builder {
    @Nullable private Options options;
    private final Environment.Builder envBuilder = Environment.builder();
    @Nullable private AudioDeviceModule audioDeviceModule;
    private AudioEncoderFactoryFactory audioEncoderFactoryFactory =
        new BuiltinAudioEncoderFactoryFactory();
    private AudioDecoderFactoryFactory audioDecoderFactoryFactory =
        new BuiltinAudioDecoderFactoryFactory();
    @Nullable private VideoEncoderFactory videoEncoderFactory;
    @Nullable private VideoDecoderFactory videoDecoderFactory;
    @Nullable private AudioProcessingFactory audioProcessingFactory;
    @Nullable private FecControllerFactoryFactoryInterface fecControllerFactoryFactory;
    @Nullable private NetworkControllerFactoryFactory networkControllerFactoryFactory;
    @Nullable private NetworkStatePredictorFactoryFactory networkStatePredictorFactoryFactory;
    @Nullable private NetEqFactoryFactory neteqFactoryFactory;
    @Nullable private AudioFrameProcessor audioFrameProcessor;

    private Builder() {}

    public Builder setOptions(Options options) {
      this.options = options;
      return this;
    }

    public Builder setFieldTrials(String fieldTrials) {
      envBuilder.setFieldTrials(fieldTrials);
      return this;
    }

    public Builder setAudioDeviceModule(AudioDeviceModule audioDeviceModule) {
      this.audioDeviceModule = audioDeviceModule;
      return this;
    }

    public Builder setAudioEncoderFactoryFactory(
        AudioEncoderFactoryFactory audioEncoderFactoryFactory) {
      if (audioEncoderFactoryFactory == null) {
        throw new IllegalArgumentException(
            "PeerConnectionFactory.Builder does not accept a null AudioEncoderFactoryFactory.");
      }
      this.audioEncoderFactoryFactory = audioEncoderFactoryFactory;
      return this;
    }

    public Builder setAudioDecoderFactoryFactory(
        AudioDecoderFactoryFactory audioDecoderFactoryFactory) {
      if (audioDecoderFactoryFactory == null) {
        throw new IllegalArgumentException(
            "PeerConnectionFactory.Builder does not accept a null AudioDecoderFactoryFactory.");
      }
      this.audioDecoderFactoryFactory = audioDecoderFactoryFactory;
      return this;
    }

    public Builder setVideoEncoderFactory(VideoEncoderFactory videoEncoderFactory) {
      this.videoEncoderFactory = videoEncoderFactory;
      return this;
    }

    public Builder setVideoDecoderFactory(VideoDecoderFactory videoDecoderFactory) {
      this.videoDecoderFactory = videoDecoderFactory;
      return this;
    }

    public Builder setAudioProcessingFactory(AudioProcessingFactory audioProcessingFactory) {
      if (audioProcessingFactory == null) {
        throw new NullPointerException(
            "PeerConnectionFactory builder does not accept a null AudioProcessingFactory.");
      }
      this.audioProcessingFactory = audioProcessingFactory;
      return this;
    }

    public Builder setFecControllerFactoryFactoryInterface(
        FecControllerFactoryFactoryInterface fecControllerFactoryFactory) {
      this.fecControllerFactoryFactory = fecControllerFactoryFactory;
      return this;
    }

    public Builder setNetworkControllerFactoryFactory(
        NetworkControllerFactoryFactory networkControllerFactoryFactory) {
      this.networkControllerFactoryFactory = networkControllerFactoryFactory;
      return this;
    }

    public Builder setNetworkStatePredictorFactoryFactory(
        NetworkStatePredictorFactoryFactory networkStatePredictorFactoryFactory) {
      this.networkStatePredictorFactoryFactory = networkStatePredictorFactoryFactory;
      return this;
    }

    /**
     * Sets a NetEqFactoryFactory for the PeerConnectionFactory. When using a
     * custom NetEqFactoryFactory, the AudioDecoderFactoryFactory will be set
     * to null. The AudioDecoderFactoryFactory should be wrapped in the
     * NetEqFactoryFactory.
     */
    public Builder setNetEqFactoryFactory(NetEqFactoryFactory neteqFactoryFactory) {
      this.neteqFactoryFactory = neteqFactoryFactory;
      return this;
    }

    /**
     * Sets an AudioFrameProcessor for the PeerConnectionFactory.
     *
     * <p>This is used to process audio frames before they are sent to the audio device module.
     */
    public Builder setAudioFrameProcessor(AudioFrameProcessor audioFrameProcessor) {
      this.audioFrameProcessor = audioFrameProcessor;
      return this;
    }

    public PeerConnectionFactory createPeerConnectionFactory() {
      checkInitializeHasBeenCalled();
      try (Environment env = envBuilder.build()) {
        if (audioDeviceModule == null) {
          audioDeviceModule = JavaAudioDeviceModule.builder(ContextUtils.getApplicationContext())
                                  .createAudioDeviceModule();
        }
        return nativeCreatePeerConnectionFactory(
            ContextUtils.getApplicationContext(),
            options,
            env.ref(),
            audioDeviceModule.getNative(env.ref()),
            audioEncoderFactoryFactory.createNativeAudioEncoderFactory(),
            audioDecoderFactoryFactory.createNativeAudioDecoderFactory(),
            videoEncoderFactory,
            videoDecoderFactory,
            audioProcessingFactory == null ? 0 : audioProcessingFactory.createNative(env.ref()),
            fecControllerFactoryFactory == null ? 0 : fecControllerFactoryFactory.createNative(),
            networkControllerFactoryFactory == null
                ? 0
                : networkControllerFactoryFactory.createNativeNetworkControllerFactory(),
            networkStatePredictorFactoryFactory == null
                ? 0
                : networkStatePredictorFactoryFactory.createNativeNetworkStatePredictorFactory(),
            neteqFactoryFactory == null ? 0 : neteqFactoryFactory.createNativeNetEqFactory(),
            audioFrameProcessor == null ? 0 : audioFrameProcessor.getNativeAudioFrameProcessor());
      }
    }
  }

  public static Builder builder() {
    return new Builder();
  }

  /**
   * Loads and initializes WebRTC. This must be called at least once before creating a
   * PeerConnectionFactory. Replaces all the old initialization methods. Must not be called while
   * a PeerConnectionFactory is alive.
   */
  @SuppressWarnings("EnumOrdinal")
  public static void initialize(InitializationOptions options) {
    ContextUtils.initialize(options.applicationContext);
    NativeLibrary.initialize(options.nativeLibraryLoader, options.nativeLibraryName);
    nativeInitializeAndroidGlobals();
    nativeInitializeFieldTrials(options.fieldTrials);
    if (options.enableInternalTracer && !internalTracerInitialized) {
      initializeInternalTracer();
    }
    if (options.loggable != null) {
      Logging.injectLoggable(options.loggable, options.loggableSeverity);
      nativeInjectLoggable(new JNILogging(options.loggable), options.loggableSeverity.ordinal());
    } else {
      Logging.d(TAG,
          "PeerConnectionFactory was initialized without an injected Loggable. "
              + "Any existing Loggable will be deleted.");
      Logging.deleteInjectedLoggable();
      nativeDeleteLoggable();
    }
  }

  private static void checkInitializeHasBeenCalled() {
    if (!NativeLibrary.isLoaded() || ContextUtils.getApplicationContext() == null) {
      throw new IllegalStateException(
          "PeerConnectionFactory.initialize was not called before creating a "
          + "PeerConnectionFactory.");
    }
  }

  private static void initializeInternalTracer() {
    internalTracerInitialized = true;
    nativeInitializeInternalTracer();
  }

  public static void shutdownInternalTracer() {
    internalTracerInitialized = false;
    nativeShutdownInternalTracer();
  }

  // Field trial initialization. Must be called before PeerConnectionFactory
  // is created.
  // Deprecated, use PeerConnectionFactory.Builder.setFieldTrials instead.
  // TODO: bugs.webrtc.org/42220378 - Delete after January 1, 2026.
  @Deprecated
  public static void initializeFieldTrials(String fieldTrialsInitString) {
    nativeInitializeFieldTrials(fieldTrialsInitString);
  }

  // Start/stop internal capturing of internal tracing.
  public static boolean startInternalTracingCapture(String tracingFilename) {
    return nativeStartInternalTracingCapture(tracingFilename);
  }

  public static void stopInternalTracingCapture() {
    nativeStopInternalTracingCapture();
  }

  @CalledByNative
  PeerConnectionFactory(long nativeFactory) {
    checkInitializeHasBeenCalled();
    if (nativeFactory == 0) {
      throw new RuntimeException("Failed to initialize PeerConnectionFactory!");
    }
    this.nativeFactory = nativeFactory;
  }

  /**
   * Internal helper function to pass the parameters down into the native JNI bridge.
   */
  @Nullable
  PeerConnection createPeerConnectionInternal(PeerConnection.RTCConfiguration rtcConfig,
      MediaConstraints constraints, PeerConnection.Observer observer,
      SSLCertificateVerifier sslCertificateVerifier) {
    checkPeerConnectionFactoryExists();
    long nativeObserver = PeerConnection.createNativePeerConnectionObserver(observer);
    if (nativeObserver == 0) {
      return null;
    }
    long nativePeerConnection = nativeCreatePeerConnection(
        nativeFactory, rtcConfig, constraints, nativeObserver, sslCertificateVerifier);
    if (nativePeerConnection == 0) {
      return null;
    }
    return new PeerConnection(nativePeerConnection);
  }

  /**
   * Deprecated. PeerConnection constraints are deprecated. Supply values in rtcConfig struct
   * instead and use the method without constraints in the signature.
   */
  @Nullable
  @Deprecated
  public PeerConnection createPeerConnection(PeerConnection.RTCConfiguration rtcConfig,
      MediaConstraints constraints, PeerConnection.Observer observer) {
    return createPeerConnectionInternal(
        rtcConfig, constraints, observer, /* sslCertificateVerifier= */ null);
  }

  /**
   * Deprecated. PeerConnection constraints are deprecated. Supply values in rtcConfig struct
   * instead and use the method without constraints in the signature.
   */
  @Nullable
  @Deprecated
  public PeerConnection createPeerConnection(List<PeerConnection.IceServer> iceServers,
      MediaConstraints constraints, PeerConnection.Observer observer) {
    PeerConnection.RTCConfiguration rtcConfig = new PeerConnection.RTCConfiguration(iceServers);
    rtcConfig.sdpSemantics = PeerConnection.SdpSemantics.UNIFIED_PLAN;
    return createPeerConnection(rtcConfig, constraints, observer);
  }

  @Nullable
  public PeerConnection createPeerConnection(
      List<PeerConnection.IceServer> iceServers, PeerConnection.Observer observer) {
    PeerConnection.RTCConfiguration rtcConfig = new PeerConnection.RTCConfiguration(iceServers);
    rtcConfig.sdpSemantics = PeerConnection.SdpSemantics.UNIFIED_PLAN;
    return createPeerConnection(rtcConfig, observer);
  }

  @Nullable
  public PeerConnection createPeerConnection(
      PeerConnection.RTCConfiguration rtcConfig, PeerConnection.Observer observer) {
    return createPeerConnection(rtcConfig, null /* constraints */, observer);
  }

  @Nullable
  public PeerConnection createPeerConnection(
      PeerConnection.RTCConfiguration rtcConfig, PeerConnectionDependencies dependencies) {
    return createPeerConnectionInternal(rtcConfig, null /* constraints */,
        dependencies.getObserver(), dependencies.getSSLCertificateVerifier());
  }

  public MediaStream createLocalMediaStream(String label) {
    checkPeerConnectionFactoryExists();
    return new MediaStream(nativeCreateLocalMediaStream(nativeFactory, label));
  }

  /**
   * Create video source with given parameters. If alignTimestamps is false, the caller is
   * responsible for aligning the frame timestamps to webrtc::TimeNanos(). This can be used to achieve
   * higher accuracy if there is a big delay between frame creation and frames being delivered to
   * the returned video source. If alignTimestamps is true, timestamps will be aligned to
   * webrtc::TimeNanos() when they arrive to the returned video source.
   */
  public VideoSource createVideoSource(boolean isScreencast, boolean alignTimestamps) {
    checkPeerConnectionFactoryExists();
    return new VideoSource(nativeCreateVideoSource(nativeFactory, isScreencast, alignTimestamps));
  }

  /**
   * Same as above with alignTimestamps set to true.
   *
   * @see #createVideoSource(boolean, boolean)
   */
  public VideoSource createVideoSource(boolean isScreencast) {
    return createVideoSource(isScreencast, /* alignTimestamps= */ true);
  }

  public VideoTrack createVideoTrack(String id, VideoSource source) {
    checkPeerConnectionFactoryExists();
    return new VideoTrack(
        nativeCreateVideoTrack(nativeFactory, id, source.getNativeVideoTrackSource()));
  }

  public AudioSource createAudioSource(MediaConstraints constraints) {
    checkPeerConnectionFactoryExists();
    return new AudioSource(nativeCreateAudioSource(nativeFactory, constraints));
  }

  public AudioTrack createAudioTrack(String id, AudioSource source) {
    checkPeerConnectionFactoryExists();
    return new AudioTrack(nativeCreateAudioTrack(nativeFactory, id, source.getNativeAudioSource()));
  }

  public RtpCapabilities getRtpReceiverCapabilities(MediaStreamTrack.MediaType mediaType) {
    checkPeerConnectionFactoryExists();
    return nativeGetRtpReceiverCapabilities(nativeFactory, mediaType);
  }

  public RtpCapabilities getRtpSenderCapabilities(MediaStreamTrack.MediaType mediaType) {
    checkPeerConnectionFactoryExists();
    return nativeGetRtpSenderCapabilities(nativeFactory, mediaType);
  }

  // Starts recording an AEC dump. Ownership of the file is transfered to the
  // native code. If an AEC dump is already in progress, it will be stopped and
  // a new one will start using the provided file.
  public boolean startAecDump(int file_descriptor, int filesize_limit_bytes) {
    checkPeerConnectionFactoryExists();
    return nativeStartAecDump(nativeFactory, file_descriptor, filesize_limit_bytes);
  }

  // Stops recording an AEC dump. If no AEC dump is currently being recorded,
  // this call will have no effect.
  public void stopAecDump() {
    checkPeerConnectionFactoryExists();
    nativeStopAecDump(nativeFactory);
  }

  public void dispose() {
    checkPeerConnectionFactoryExists();
    nativeFreeFactory(nativeFactory);
    networkThread = null;
    workerThread = null;
    signalingThread = null;
    nativeFactory = 0;
  }

  /** Returns a pointer to the native webrtc::PeerConnectionFactoryInterface. */
  public long getNativePeerConnectionFactory() {
    checkPeerConnectionFactoryExists();
    return nativeGetNativePeerConnectionFactory(nativeFactory);
  }

  /** Returns a pointer to the native OwnedFactoryAndThreads object */
  public long getNativeOwnedFactoryAndThreads() {
    checkPeerConnectionFactoryExists();
    return nativeFactory;
  }

  private void checkPeerConnectionFactoryExists() {
    if (nativeFactory == 0) {
      throw new IllegalStateException("PeerConnectionFactory has been disposed.");
    }
  }

  private static void printStackTrace(
      @Nullable ThreadInfo threadInfo, boolean printNativeStackTrace) {
    if (threadInfo == null) {
      // Thread callbacks have not been completed yet, ignore call.
      return;
    }
    final String threadName = threadInfo.thread.getName();
    StackTraceElement[] stackTraces = threadInfo.thread.getStackTrace();
    if (stackTraces.length > 0) {
      Logging.w(TAG, threadName + " stacktrace:");
      for (StackTraceElement stackTrace : stackTraces) {
        Logging.w(TAG, stackTrace.toString());
      }
    }
    if (printNativeStackTrace) {
      // Imitate output from debuggerd/tombstone so that stack trace can easily be symbolized with
      // ndk-stack.
      Logging.w(TAG, "*** *** *** *** *** *** *** *** *** *** *** *** *** *** *** ***");
      Logging.w(TAG,
          "pid: " + Process.myPid() + ", tid: " + threadInfo.tid + ", name: " + threadName
              + "  >>> WebRTC <<<");
      nativePrintStackTrace(threadInfo.tid);
    }
  }

  /** Deprecated, use non-static version instead. */
  @Deprecated
  public static void printStackTraces() {
    printStackTrace(staticNetworkThread, /* printNativeStackTrace= */ false);
    printStackTrace(staticWorkerThread, /* printNativeStackTrace= */ false);
    printStackTrace(staticSignalingThread, /* printNativeStackTrace= */ false);
  }

  /**
   * Print the Java stack traces for the critical threads used by PeerConnectionFactory, namely;
   * signaling thread, worker thread, and network thread. If printNativeStackTraces is true, also
   * attempt to print the C++ stack traces for these threads.
   */
  public void printInternalStackTraces(boolean printNativeStackTraces) {
    printStackTrace(signalingThread, printNativeStackTraces);
    printStackTrace(workerThread, printNativeStackTraces);
    printStackTrace(networkThread, printNativeStackTraces);
  }

  @CalledByNative
  private void onNetworkThreadReady() {
    networkThread = ThreadInfo.getCurrent();
    staticNetworkThread = networkThread;
    Logging.d(TAG, "onNetworkThreadReady");
  }

  @CalledByNative
  private void onWorkerThreadReady() {
    workerThread = ThreadInfo.getCurrent();
    staticWorkerThread = workerThread;
    Logging.d(TAG, "onWorkerThreadReady");
  }

  @CalledByNative
  private void onSignalingThreadReady() {
    signalingThread = ThreadInfo.getCurrent();
    staticSignalingThread = signalingThread;
    Logging.d(TAG, "onSignalingThreadReady");
  }

  // Must be called at least once before creating a PeerConnectionFactory
  // (for example, at application startup time).
  private static native void nativeInitializeAndroidGlobals();
  private static native void nativeInitializeFieldTrials(String fieldTrialsInitString);
  private static native void nativeInitializeInternalTracer();
  // Internal tracing shutdown, called to prevent resource leaks. Must be called after
  // PeerConnectionFactory is gone to prevent races with code performing tracing.
  private static native void nativeShutdownInternalTracer();
  private static native boolean nativeStartInternalTracingCapture(String tracingFilename);
  private static native void nativeStopInternalTracingCapture();

  private static native PeerConnectionFactory nativeCreatePeerConnectionFactory(Context context,
      Options options, long webrtcEnvRef, long nativeAudioDeviceModule, long audioEncoderFactory,
      long audioDecoderFactory, VideoEncoderFactory encoderFactory,
      VideoDecoderFactory decoderFactory, long nativeAudioProcessor,
      long nativeFecControllerFactory, long nativeNetworkControllerFactory,
      long nativeNetworkStatePredictorFactory, long neteqFactory, long nativeAudioFrameProcessor);

  private static native long nativeCreatePeerConnection(long factory,
      PeerConnection.RTCConfiguration rtcConfig, MediaConstraints constraints, long nativeObserver,
      SSLCertificateVerifier sslCertificateVerifier);
  private static native long nativeCreateLocalMediaStream(long factory, String label);
  private static native long nativeCreateVideoSource(
      long factory, boolean is_screencast, boolean alignTimestamps);
  private static native long nativeCreateVideoTrack(
      long factory, String id, long nativeVideoSource);
  private static native long nativeCreateAudioSource(long factory, MediaConstraints constraints);
  private static native long nativeCreateAudioTrack(long factory, String id, long nativeSource);
  private static native boolean nativeStartAecDump(
      long factory, int file_descriptor, int filesize_limit_bytes);
  private static native void nativeStopAecDump(long factory);
  private static native void nativeFreeFactory(long factory);
  private static native long nativeGetNativePeerConnectionFactory(long factory);
  private static native void nativeInjectLoggable(JNILogging jniLogging, int severity);
  private static native void nativeDeleteLoggable();
  private static native void nativePrintStackTrace(int tid);
  private static native RtpCapabilities nativeGetRtpSenderCapabilities(
      long factory, MediaStreamTrack.MediaType mediaType);
  private static native RtpCapabilities nativeGetRtpReceiverCapabilities(
      long factory, MediaStreamTrack.MediaType mediaType);
}