Build WebRTC with data channel only.

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

Index: webrtc/sdk/android/src/jni/peerconnection_jni.cc
diff --git a/webrtc/sdk/android/src/jni/peerconnection_jni.cc b/webrtc/sdk/android/src/jni/peerconnection_jni.cc
index c07d58faffc6210116057b02cf9d52f3a9432ea8..1d6ce09ad912df957a7a77620c001612b285cc01 100644
--- a/webrtc/sdk/android/src/jni/peerconnection_jni.cc
+++ b/webrtc/sdk/android/src/jni/peerconnection_jni.cc
@@ -1353,10 +1353,12 @@ JOW(jlong, PeerConnectionFactory_nativeCreatePeerConnectionFactory)(
     options = ParseOptionsFromJava(jni, joptions);
   }
 
+#ifdef HAVE_MEDIA
   if (video_hw_acceleration_enabled) {
     encoder_factory = new MediaCodecVideoEncoderFactory();
     decoder_factory = new MediaCodecVideoDecoderFactory();
   }
+#endif
   // Do not create network_monitor_factory only if the options are
   // provided and disable_network_monitor therein is set to true.
   if (!(has_options && options.disable_network_monitor)) {
@@ -1541,7 +1543,9 @@ JOW(void, PeerConnectionFactory_nativeSetVideoHwAccelerationOptions)(
   if (encoder_factory &&
       jni->IsInstanceOf(local_egl_context, j_eglbase14_context_class)) {
     LOG(LS_INFO) << "Set EGL context for HW encoding.";
+#ifdef HAVE_MEDIA
     encoder_factory->SetEGLContext(jni, local_egl_context);
+#endif

[pthatcher1, 2017/05/03 18:05:53]

Won't the encoder and decoder factories by null so you don't need to do this
(here and below)?

[Zhi Huang, 2017/05/04 01:08:03]

The idea here is trying to avoid linking the method SetEGLContext();

   }
 
   MediaCodecVideoDecoderFactory* decoder_factory =
@@ -1549,7 +1553,9 @@ JOW(void, PeerConnectionFactory_nativeSetVideoHwAccelerationOptions)(
           (owned_factory->decoder_factory());
   if (decoder_factory) {
     LOG(LS_INFO) << "Set EGL context for HW decoding.";
+#ifdef HAVE_MEDIA
     decoder_factory->SetEGLContext(jni, remote_egl_context);
+#endif
   }
 }