Added java interface VideoEncoderFactory.VideoEncoderSelector and implemented VideoEncoderSelectorWrapper.

Bug: webrtc:11341
Change-Id: Ic15658e09643aec119a97ddfaebfdb72ba3407c7
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/168487
Reviewed-by: Sami Kalliomäki <sakal@webrtc.org>
Commit-Queue: Philip Eliasson <philipel@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#30519}

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

@@ -14,6 +14,25 @@ import android.support.annotation.Nullable;
 
 /** Factory for creating VideoEncoders. */
 public interface VideoEncoderFactory {
+  public interface VideoEncoderSelector {
+    /** Called with the VideoCodecInfo of the currently used encoder. */
+    @CalledByNative("VideoEncoderSelector") void onCurrentEncoder(VideoCodecInfo info);
+
+    /**
+     * Called with the current encoding bitrate. Returns null if the encoder
+     * selector which to keep the current encoder or a VideoCodecInfo if a
+     * new encoder is preferred.
+     */
+    @Nullable @CalledByNative("VideoEncoderSelector") VideoCodecInfo onEncodingBitrate(int kbps);
+
+    /**
+     * Called when the currently used encoder signal itself as broken. Returns
+     * null if the encoder selector which to keep the current encoder or a
+     * VideoCodecInfo if a new encoder is preferred.
+     */
+    @Nullable @CalledByNative("VideoEncoderSelector") VideoCodecInfo onEncoderBroken();
+  }
+
   /** Creates an encoder for the given video codec. */
   @Nullable @CalledByNative VideoEncoder createEncoder(VideoCodecInfo info);
 
@@ -32,4 +51,13 @@ public interface VideoEncoderFactory {
   default VideoCodecInfo[] getImplementations() {
     return getSupportedCodecs();
   }
+
+  /**
+   * Returns a VideoEncoderSelector if implemented by the VideoEncoderFactory,
+   * null otherwise.
+   */
+  @CalledByNative
+  default VideoEncoderSelector getEncoderSelector() {
+    return null;
+  }
 }