feat: Add getStats for RtpSender/RtpReceiver.

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

@@ -1176,6 +1176,14 @@ public void getStats(RTCStatsCollectorCallback callback) {
     nativeNewGetStats(callback);
   }
 
+  public void getStats(RTCStatsCollectorCallback callback, RtpSender sender) {
+    nativeNewGetStatsForSender(callback, sender.getNativeRtpSender());
+  }
+
+  public void getStats(RTCStatsCollectorCallback callback, RtpReceiver receiver) {
+    nativeNewGetStatsForReceiver(callback, receiver.getNativeRtpReceiver());
+  }
+
   /**
    * Limits the bandwidth allocated for all RTP streams sent by this
    * PeerConnection. Pass null to leave a value unchanged.
@@ -1310,6 +1318,10 @@ private native void nativeAddIceCandidateWithObserver(
   private native void nativeRemoveLocalStream(long stream);
   private native boolean nativeOldGetStats(StatsObserver observer, long nativeTrack);
   private native void nativeNewGetStats(RTCStatsCollectorCallback callback);
+  private native void nativeNewGetStatsForSender(
+      RTCStatsCollectorCallback callback, long nativeRtpSender);
+  private native void nativeNewGetStatsForReceiver(
+      RTCStatsCollectorCallback callback, long nativeRtpReceiver);
   private native RtpSender nativeCreateSender(String kind, String stream_id);
   private native List<RtpSender> nativeGetSenders();
   private native List<RtpReceiver> nativeGetReceivers();

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

@@ -75,6 +75,12 @@ public void setFrameDecryptor(FrameDecryptor frameDecryptor) {
     nativeSetFrameDecryptor(nativeRtpReceiver, frameDecryptor.getNativeFrameDecryptor());
   }
 
+  /** Returns a pointer to webrtc::RtpReceiverInterface. */
+  long getNativeRtpReceiver() {
+    checkRtpReceiverExists();
+    return nativeRtpReceiver;
+  }
+
   private void checkRtpReceiverExists() {
     if (nativeRtpReceiver == 0) {
       throw new IllegalStateException("RtpReceiver has been disposed.");

sdk/android/src/jni/pc/peer_connection.cc

@@ -842,6 +842,30 @@ static void JNI_PeerConnection_NewGetStats(
   ExtractNativePC(jni, j_pc)->GetStats(callback.get());
 }
 
+static void JNI_PeerConnection_NewGetStatsForSender(
+    JNIEnv* jni,
+    const JavaParamRef<jobject>& j_pc,
+    const JavaParamRef<jobject>& j_callback,
+    jlong native_sener) {
+  auto callback =
+      rtc::make_ref_counted<RTCStatsCollectorCallbackWrapper>(jni, j_callback);
+  rtc::scoped_refptr<RtpSenderInterface> selector(
+      reinterpret_cast<RtpSenderInterface*>(native_sener));
+  ExtractNativePC(jni, j_pc)->GetStats(selector, callback);
+}
+
+static void JNI_PeerConnection_NewGetStatsForReceiver(
+    JNIEnv* jni,
+    const JavaParamRef<jobject>& j_pc,
+    const JavaParamRef<jobject>& j_callback,
+    jlong native_receiver) {
+  auto callback =
+      rtc::make_ref_counted<RTCStatsCollectorCallbackWrapper>(jni, j_callback);
+  rtc::scoped_refptr<RtpReceiverInterface> selector(
+      reinterpret_cast<RtpReceiverInterface*>(native_receiver));
+  ExtractNativePC(jni, j_pc)->GetStats(selector, callback);
+}
+
 static jboolean JNI_PeerConnection_SetBitrate(
     JNIEnv* jni,
     const JavaParamRef<jobject>& j_pc,