Build WebRTC with data channel only.

webrtc/pc/mediafactory.cc

+/*
+ *  Copyright 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 "webrtc/call/call.h"
+#include "webrtc/logging/rtc_event_log/rtc_event_log.h"
+#include "webrtc/media/engine/webrtcmediaengine.h"
+
+namespace webrtc {
+class AudioDecoderFactory;
+class AudioDeviceModule;
+class AudioMixer;
+}
+namespace cricket {
+class WebRtcVideoDecoderFactory;
+class WebRtcVideoEncoderFactory;
+}
+
+namespace webrtc {
+
+std::unique_ptr<cricket::MediaEngineInterface> CreateMediaEngine(
+    webrtc::AudioDeviceModule* adm,
+    const rtc::scoped_refptr<webrtc::AudioEncoderFactory>&
+        audio_encoder_factory,
+    const rtc::scoped_refptr<webrtc::AudioDecoderFactory>&
+        audio_decoder_factory,
+    cricket::WebRtcVideoEncoderFactory* video_encoder_factory,
+    cricket::WebRtcVideoDecoderFactory* video_decoder_factory,
+    rtc::scoped_refptr<webrtc::AudioMixer> audio_mixer) {
+  return std::unique_ptr<cricket::MediaEngineInterface>(
+      cricket::WebRtcMediaEngineFactory::Create(
+          adm, audio_encoder_factory, audio_decoder_factory,
+          video_encoder_factory, video_decoder_factory, audio_mixer));
+}
+
+std::unique_ptr<RtcEventLog> CreateRtcEventLog() {
+  return std::unique_ptr<RtcEventLog>(RtcEventLog::Create());
+}
+
+Call* CreateCall(const Call::Config& config) {
+  return webrtc::Call::Create(config);
+}

[Taylor Brandstetter, 2017/05/30 17:30:53]

I think a level of indirection can be removed here too, by defining
Call::Create, RtcEventLog::Create and WebRtcMediaEngineFactory::Create directly
here. I don't think this file should ever end up linked with a file that has
their actual implementations.

[Zhi Huang, 2017/05/31 00:03:29]

Done.

+
+}  // namespace webrtc