H.264 video codec support using OpenH264/FFmpeg

webrtc/modules/video_coding/BUILD.gn

Index: webrtc/modules/video_coding/BUILD.gn
diff --git a/webrtc/modules/video_coding/BUILD.gn b/webrtc/modules/video_coding/BUILD.gn
index cbfe8c091e8b1b1ca41a1e7d85bbad6e652dbee9..0fd42257a410bc3087d4f057cfddc4ab9eb88e8f 100644
--- a/webrtc/modules/video_coding/BUILD.gn
+++ b/webrtc/modules/video_coding/BUILD.gn
@@ -133,9 +133,24 @@ source_set("webrtc_h264") {
     configs -= [ "//build/config/clang:find_bad_constructs" ]
   }
 
+  defines = []
   deps = [
     "../../system_wrappers",
   ]
+
+  if (use_third_party_h264) {
+    defines += [ "WEBRTC_THIRD_PARTY_H264" ]
+    sources += [
+      "codecs/h264/h264_decoder_impl.cc",
+      "codecs/h264/h264_decoder_impl.h",
+      "codecs/h264/h264_encoder_impl.cc",
+      "codecs/h264/h264_encoder_impl.h",
+    ]
+    deps += [
+      "//third_party/ffmpeg:ffmpeg",
+      "//third_party/openh264:encoder",
+    ]
+  }
 }
 
 # TODO(tkchin): Source set for webrtc_h264_video_toolbox. Currently not