Adding Java binding for CreateSender.

talk/app/webrtc/java/jni/peerconnection_jni.cc

 /*
  * libjingle
  * Copyright 2013 Google Inc.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are met:
  *
  *  1. Redistributions of source code must retain the above copyright notice,
  *     this list of conditions and the following disclaimer.
  *  2. Redistributions in binary form must reproduce the above copyright notice,
@@ skipping 1735 matching lines @@
   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) {
+  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);
+  rtc::scoped_refptr<RtpSenderInterface> sender =
+      ExtractNativePC(jni, j_pc)->CreateSender(kind);
+  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 Java object, and will be freed from there.

[AlexG, 2015/12/02 00:50:16]

nit: extend comment to list what method will free senders - I guess
peerconnection.dispose() and 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");
@@ skipping 329 matching lines @@
   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