Build WebRTC with data channel only.

webrtc/sdk/android/src/jni/peerconnection_video_nullimpl_jni.cc

+/*
+ *  Copyright (c) 2017 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.
+ */
+
+#include <jni.h>
+
+#include "webrtc/media/engine/webrtcvideodecoderfactory.h"
+#include "webrtc/media/engine/webrtcvideoencoderfactory.h"
+#include "webrtc/sdk/android/src/jni/androidvideotracksource.h"
+#include "webrtc/sdk/android/src/jni/classreferenceholder.h"
+
+namespace webrtc_jni {
+
+class SurfaceTextureHelper;
+class MediaCodecVideoEncoderFactory;
+class MediaCodecVideoDecoderFactory;
+
+cricket::WebRtcVideoEncoderFactory* CreateVideoEncoderFactory() {
+  return nullptr;
+}
+
+cricket::WebRtcVideoDecoderFactory* CreateVideoDecoderFactory() {
+  return nullptr;
+}
+
+rtc::scoped_refptr<webrtc::AndroidVideoTrackSource>
+CreateAndroidVideoTrackSource(rtc::Thread* signaling_thread,
+                              JNIEnv* jni,
+                              jobject j_egl_context,
+                              bool is_screencast = false) {
+  return rtc::scoped_refptr<webrtc::AndroidVideoTrackSource>();
+}
+
+jobject GetSurfaceTextureHelper(
+    rtc::scoped_refptr<SurfaceTextureHelper> surface_texture_helper) {
+  return nullptr;
+}
+
+void EncoderFactorySetEGLContext(MediaCodecVideoEncoderFactory* encoder_factory,
+                                 JNIEnv* jni,
+                                 jobject local_egl_context) {}
+
+void DecoderFactorySetEGLContext(MediaCodecVideoDecoderFactory* decoder_factory,
+                                 JNIEnv* jni,
+                                 jobject remote_egl_context) {}
+

[pthatcher, 2017/05/18 17:50:27]

I think a good name for this file may be nullvideo_jni.cc

+}  // namespace webrtc_jni