Standalone denoiser (off by default).

webrtc/modules/video_processing/BUILD.gn

Index: webrtc/modules/video_processing/BUILD.gn
diff --git a/webrtc/modules/video_processing/BUILD.gn b/webrtc/modules/video_processing/BUILD.gn
index 43df0802adce5d78c8c5ef2e5c691e04d3975690..edeac947c7406db448abf2991c5fac9e6dfb2f6e 100644
--- a/webrtc/modules/video_processing/BUILD.gn
+++ b/webrtc/modules/video_processing/BUILD.gn
@@ -6,6 +6,7 @@
 # in the file PATENTS.  All contributing project authors may
 # be found in the AUTHORS file in the root of the source tree.
 
+import("//build/config/arm.gni")
 import("../../build/webrtc.gni")
 
 build_video_processing_sse2 = current_cpu == "x86" || current_cpu == "x64"
@@ -26,8 +27,16 @@ source_set("video_processing") {
     "include/video_processing_defines.h",
     "spatial_resampler.cc",
     "spatial_resampler.h",
+    "util/denoiser_filter.cc",
+    "util/denoiser_filter.h",
+    "util/denoiser_filter_c.cc",
+    "util/denoiser_filter_c.h",
+    "util/skin_detection.cc",
+    "util/skin_detection.h",
     "video_decimator.cc",
     "video_decimator.h",
+    "video_denoiser.cc",
+    "video_denoiser.h",
     "video_processing_impl.cc",
     "video_processing_impl.h",
   ]
@@ -41,6 +50,9 @@ source_set("video_processing") {
   if (build_video_processing_sse2) {
     deps += [ ":video_processing_sse2" ]
   }
+  if (rtc_build_with_neon) {
+    deps += [ ":video_processing_neon" ]
+  }
 
   configs += [ "../..:common_config" ]
   public_configs = [ "../..:common_inherited_config" ]
@@ -56,6 +68,8 @@ if (build_video_processing_sse2) {
   source_set("video_processing_sse2") {
     sources = [
       "content_analysis_sse2.cc",
+      "util/denoiser_filter_sse2.cc",
+      "util/denoiser_filter_sse2.h",
     ]
 
     configs += [ "../..:common_config" ]
@@ -72,3 +86,16 @@ if (build_video_processing_sse2) {
     }
   }
 }
+
+if (rtc_build_with_neon) {
+  source_set("video_processing_neon") {
+    sources = [
+      "util/denoiser_filter_neon.cc",
+      "util/denoiser_filter_neon.h",
+    ]
+    if (current_cpu != "arm64") {
+      configs -= [ "//build/config/compiler:compiler_arm_fpu" ]
+      cflags = [ "-mfpu=neon" ]
+    }
+  }

[kjellander_webrtc, 2015/11/26 16:28:36]

Our FYI bots used for rolling are failing the Android GN build due to this:
https://build.chromium.org/p/chromium.webrtc.fyi/builders/Android%20GN/builds...

I think it's because the include paths are not properly setup for the
build_in_chromium=True case. 
I believe you can solve that by adding:
    configs += [ "..:common_config" ]
    public_configs = [ "..:common_inherited_config" ]
similar to the common_audio_neon target in
https://chromium.googlesource.com/external/webrtc/+/master/webrtc/common_audi...
but to be sure you need build from a Chromium checkout with the change applied.

+}