Win DirectShow: connect antibanding/anti-flicker where supported.

media/video/capture/win/video_capture_device_win.cc

Index: media/video/capture/win/video_capture_device_win.cc
diff --git a/media/video/capture/win/video_capture_device_win.cc b/media/video/capture/win/video_capture_device_win.cc
index 2afb96860177ea648017597a2ce05ee34c0a5316..f56646b3264b595905da6ca8717a4302574d87d4 100644
--- a/media/video/capture/win/video_capture_device_win.cc
+++ b/media/video/capture/win/video_capture_device_win.cc
@@ -4,6 +4,9 @@
 
 #include "media/video/capture/win/video_capture_device_win.h"
 
+#include <ks.h>
+#include <ksmedia.h>
+
 #include <algorithm>
 #include <list>
 
@@ -591,6 +594,8 @@ void VideoCaptureDeviceWin::AllocateAndStart(
     }
   }
 
+  SetAntiFlickerInCaptureFilter();
+
   if (format.pixel_format == PIXEL_FORMAT_MJPEG && mjpg_filter_.get()) {
     // Connect the camera to the MJPEG decoder.
     hr = graph_builder_->ConnectDirect(output_capture_pin_, input_mjpg_pin_,
@@ -749,6 +754,36 @@ bool VideoCaptureDeviceWin::CreateCapabilityMap() {
   return !capabilities_.empty();
 }
 
+// Set the power line frequency removal in |capture_filter_| if available.
+void VideoCaptureDeviceWin::SetAntiFlickerInCaptureFilter() {
+  const int power_line_frequency = GetPowerLineFrequencyForLocation();
+  if (power_line_frequency != kPowerLine50Hz &&
+      power_line_frequency != kPowerLine60Hz) {
+    return;
+  }
+  ScopedComPtr<IKsPropertySet> ks_propset;
+  DWORD type_support = 0;
+  HRESULT hr;
+  if (SUCCEEDED(hr = ks_propset.QueryFrom(capture_filter_)) &&
+      SUCCEEDED(hr = ks_propset->QuerySupported(PROPSETID_VIDCAP_VIDEOPROCAMP,
+          KSPROPERTY_VIDEOPROCAMP_POWERLINE_FREQUENCY, &type_support)) &&
+      (type_support & KSPROPERTY_SUPPORT_SET)) {
+    KSPROPERTY_VIDEOPROCAMP_S data = {};
+    data.Property.Set = PROPSETID_VIDCAP_VIDEOPROCAMP;
+    data.Property.Id = KSPROPERTY_VIDEOPROCAMP_POWERLINE_FREQUENCY;
+    data.Property.Flags = KSPROPERTY_TYPE_SET;
+    data.Value = (power_line_frequency == kPowerLine50Hz) ? 1 : 2;
+    data.Flags = KSPROPERTY_VIDEOPROCAMP_FLAGS_MANUAL;
+    hr = ks_propset->Set(PROPSETID_VIDCAP_VIDEOPROCAMP,
+                         KSPROPERTY_VIDEOPROCAMP_POWERLINE_FREQUENCY,
+                         &data, sizeof(data), &data, sizeof(data));
+    DVLOG_IF(ERROR, FAILED(hr)) << "Anti-flicker setting failed.";
+    DVLOG_IF(2, SUCCEEDED(hr)) << "Anti-flicker set correctly.";
+  } else {
+    DVLOG(2) << "Anti-flicker setting not supported.";
+  }
+}
+
 void VideoCaptureDeviceWin::SetErrorState(const std::string& reason) {
   DCHECK(CalledOnValidThread());
   DVLOG(1) << reason;