Support building WebRTC without audio and video for Android

webrtc/sdk/android/src/jni/null_media_jni.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/sdk/android/src/jni/media_jni.h"
+
+#include "webrtc/api/audio_codecs/audio_decoder_factory.h"  // nogncheck
+#include "webrtc/api/audio_codecs/audio_encoder_factory.h"  // nogncheck
+#include "webrtc/call/callfactoryinterface.h"
+#include "webrtc/logging/rtc_event_log/rtc_event_log_factory_interface.h"
+#include "webrtc/media/engine/webrtcvideodecoderfactory.h"  // nogncheck
+#include "webrtc/media/engine/webrtcvideoencoderfactory.h"  // nogncheck
+
+namespace webrtc_jni {
+
+// This implementation is used for building WebRTC without audio and video
+// support.
+rtc::scoped_refptr<webrtc::PeerConnectionFactoryInterface>
+CreateNativePeerConnectionFactory(
+    rtc::Thread* network_thread,
+    rtc::Thread* worker_thread,
+    rtc::Thread* signaling_thread,
+    webrtc::AudioDeviceModule* default_adm,
+    rtc::scoped_refptr<webrtc::AudioEncoderFactory> audio_encoder_factory,
+    rtc::scoped_refptr<webrtc::AudioDecoderFactory> audio_decoder_factory,
+    cricket::WebRtcVideoEncoderFactory* video_encoder_factory,
+    cricket::WebRtcVideoDecoderFactory* video_decoder_factory) {
+  return CreateModularPeerConnectionFactory(
+      network_thread, worker_thread, signaling_thread, default_adm,
+      audio_encoder_factory, audio_decoder_factory, video_encoder_factory,
+      video_decoder_factory, nullptr /*audio_mixer*/,
+      std::unique_ptr<cricket::MediaEngineInterface>(),
+      std::unique_ptr<webrtc::CallFactoryInterface>(),
+      std::unique_ptr<webrtc::RtcEventLogFactoryInterface>());
+}
+
+}  // namespace webrtc_jni