Image Capture: wire getCapabilities() in Windows

media/capture/video/win/video_capture_device_win.cc

Index: media/capture/video/win/video_capture_device_win.cc
diff --git a/media/capture/video/win/video_capture_device_win.cc b/media/capture/video/win/video_capture_device_win.cc
index b244df7a3c991689dc428f2f32c00496091e240e..43bd83ab52a02d7c75717b5d51d01686019d33b0 100644
--- a/media/capture/video/win/video_capture_device_win.cc
+++ b/media/capture/video/win/video_capture_device_win.cc
@@ -7,6 +7,7 @@
 #include <ks.h>
 #include <ksmedia.h>
 #include <objbase.h>
+#include <vidcap.h>
 
 #include <algorithm>
 #include <list>
@@ -26,10 +27,10 @@ using base::win::ScopedVariant;
 namespace media {
 
 #if DCHECK_IS_ON()
-#define DLOG_IF_FAILED_WITH_HRESULT(message, hr)                        \
-  {                                                                     \
-    DLOG_IF(ERROR, FAILED(hr)) << (message) << ": "                     \
-                               << logging::SystemErrorCodeToString(hr); \
+#define DLOG_IF_FAILED_WITH_HRESULT(message, hr)                      \
+  {                                                                   \
+    DLOG_IF(ERROR, FAILED(hr))                                        \
+        << (message) << ": " << logging::SystemErrorCodeToString(hr); \
   }
 #else
 #define DLOG_IF_FAILED_WITH_HRESULT(message, hr) \
@@ -62,6 +63,45 @@ bool PinMatchesMajorType(IPin* pin, REFGUID major_type) {
   return SUCCEEDED(hr) && connection_media_type.majortype == major_type;
 }
 
+// Retrieves the control range and value using the provided getters, and
+// optionally returns the associated supported and current mode.
+template <typename RangeGetter, typename ValueGetter>
+mojom::RangePtr RetrieveControlRangeAndCurrent(
+    RangeGetter range_getter,
+    ValueGetter value_getter,
+    std::vector<mojom::MeteringMode>* supported_modes = nullptr,
+    mojom::MeteringMode* current_mode = nullptr) {
+  auto control_range = mojom::Range::New();
+  long min, max, step, default_value, flags;
+  HRESULT hr = range_getter(&min, &max, &step, &default_value, &flags);
+  DLOG_IF_FAILED_WITH_HRESULT("Control range reading failed", hr);
+  if (SUCCEEDED(hr)) {
+    control_range->min = min;
+    control_range->max = max;
+    control_range->step = step;
+    if (supported_modes != nullptr) {
+      if (flags && CameraControl_Flags_Auto)
+        supported_modes->push_back(mojom::MeteringMode::CONTINUOUS);
+      if (flags && CameraControl_Flags_Manual)
+        supported_modes->push_back(mojom::MeteringMode::MANUAL);
+    }
+  }
+  long current;
+  hr = value_getter(&current, &flags);
+  DLOG_IF_FAILED_WITH_HRESULT("Control value reading failed", hr);
+  if (SUCCEEDED(hr)) {
+    control_range->current = current;
+    if (current_mode != nullptr) {
+      if (flags && CameraControl_Flags_Auto)
+        *current_mode = mojom::MeteringMode::CONTINUOUS;
+      else if (flags && CameraControl_Flags_Manual)
+        *current_mode = mojom::MeteringMode::MANUAL;
+    }
+  }
+
+  return control_range;
+}
+
 // Finds and creates a DirectShow Video Capture filter matching the |device_id|.
 // static
 HRESULT VideoCaptureDeviceWin::GetDeviceFilter(const std::string& device_id,
@@ -93,8 +133,8 @@ HRESULT VideoCaptureDeviceWin::GetDeviceFilter(const std::string& device_id,
 
     // Find |device_id| via DevicePath, Description or FriendlyName, whichever
     // is available first and is a VT_BSTR (i.e. String) type.
-    static const wchar_t* kPropertyNames[] = {
-        L"DevicePath", L"Description", L"FriendlyName"};
+    static const wchar_t* kPropertyNames[] = {L"DevicePath", L"Description",
+                                              L"FriendlyName"};
 
     ScopedVariant name;
     for (const auto* property_name : kPropertyNames) {
@@ -155,8 +195,7 @@ ScopedComPtr<IPin> VideoCaptureDeviceWin::GetPin(IBaseFilter* filter,
 }
 
 // static
-VideoPixelFormat
-VideoCaptureDeviceWin::TranslateMediaSubtypeToPixelFormat(
+VideoPixelFormat VideoCaptureDeviceWin::TranslateMediaSubtypeToPixelFormat(
     const GUID& sub_type) {
   static struct {
     const GUID& sub_type;
@@ -453,6 +492,134 @@ void VideoCaptureDeviceWin::TakePhoto(TakePhotoCallback callback) {
   take_photo_callbacks_.push(std::move(callback));
 }
 
+void VideoCaptureDeviceWin::GetPhotoCapabilities(
+    GetPhotoCapabilitiesCallback callback) {
+  DCHECK(thread_checker_.CalledOnValidThread());
+
+  base::win::ScopedComPtr<IKsTopologyInfo> info;
+  HRESULT hr = capture_filter_.CopyTo(info.Receive());
+  if (FAILED(hr)) {
+    SetErrorState(FROM_HERE, "Failed to obtain the topology info.", hr);
+    return;
+  }
+
+  DWORD num_nodes = 0;
+  hr = info->get_NumNodes(&num_nodes);
+  if (FAILED(hr)) {
+    SetErrorState(FROM_HERE, "Failed to obtain the number of nodes.", hr);
+    return;
+  }
+
+  // Every UVC camera is expected to have a single ICameraControl and a single
+  // IVideoProcAmp nodes, and both are needed; ignore any unlikely later ones.
+  GUID node_type;
+  base::win::ScopedComPtr<ICameraControl> camera_control;
+  for (size_t i = 0; i < num_nodes; i++) {
+    info->get_NodeType(i, &node_type);
+    if (IsEqualGUID(node_type, KSNODETYPE_VIDEO_CAMERA_TERMINAL)) {
+      hr = info->CreateNodeInstance(i, IID_PPV_ARGS(camera_control.Receive()));
+      if (SUCCEEDED(hr))
+        break;
+      SetErrorState(FROM_HERE, "Failed to retrieve the ICameraControl.", hr);
+      return;
+    }
+  }
+  if (!camera_control)
+    return;
+  base::win::ScopedComPtr<IVideoProcAmp> video_control;
+  for (size_t i = 0; i < num_nodes; i++) {
+    info->get_NodeType(i, &node_type);
+    if (IsEqualGUID(node_type, KSNODETYPE_VIDEO_PROCESSING)) {
+      hr = info->CreateNodeInstance(i, IID_PPV_ARGS(video_control.Receive()));
+      if (SUCCEEDED(hr))
+        break;
+      SetErrorState(FROM_HERE, "Failed to retrieve the IVideoProcAmp.", hr);
+      return;
+    }
+  }
+  if (!video_control)
+    return;
+
+  auto photo_capabilities = mojom::PhotoCapabilities::New();
+
+  photo_capabilities->exposure_compensation = RetrieveControlRangeAndCurrent(
+      [camera_control](auto... args) {
+        return camera_control->getRange_Exposure(args...);
+      },
+      [camera_control](auto... args) {
+        return camera_control->get_Exposure(args...);
+      },
+      &photo_capabilities->supported_exposure_modes,
+      &photo_capabilities->current_exposure_mode);
+
+  photo_capabilities->color_temperature = RetrieveControlRangeAndCurrent(
+      [video_control](auto... args) {
+        return video_control->getRange_WhiteBalance(args...);
+      },
+      [video_control](auto... args) {
+        return video_control->get_WhiteBalance(args...);
+      },
+      &photo_capabilities->supported_white_balance_modes,
+      &photo_capabilities->current_white_balance_mode);
+
+  // Ignore the returned Focus control range and status.
+  RetrieveControlRangeAndCurrent(
+      [camera_control](auto... args) {
+        return camera_control->getRange_Focus(args...);
+      },
+      [camera_control](auto... args) {
+        return camera_control->get_Focus(args...);
+      },
+      &photo_capabilities->supported_focus_modes,
+      &photo_capabilities->current_focus_mode);
+
+  photo_capabilities->iso = mojom::Range::New();
+
+  photo_capabilities->brightness = RetrieveControlRangeAndCurrent(
+      [video_control](auto... args) {
+        return video_control->getRange_Brightness(args...);
+      },
+      [video_control](auto... args) {
+        return video_control->get_Brightness(args...);
+      });
+  photo_capabilities->contrast = RetrieveControlRangeAndCurrent(
+      [video_control](auto... args) {
+        return video_control->getRange_Contrast(args...);
+      },
+      [video_control](auto... args) {
+        return video_control->get_Contrast(args...);
+      });
+  photo_capabilities->saturation = RetrieveControlRangeAndCurrent(
+      [video_control](auto... args) {
+        return video_control->getRange_Saturation(args...);
+      },
+      [video_control](auto... args) {
+        return video_control->get_Saturation(args...);
+      });
+  photo_capabilities->sharpness = RetrieveControlRangeAndCurrent(
+      [video_control](auto... args) {
+        return video_control->getRange_Sharpness(args...);
+      },
+      [video_control](auto... args) {
+        return video_control->get_Sharpness(args...);
+      });
+
+  photo_capabilities->zoom = RetrieveControlRangeAndCurrent(
+      [camera_control](auto... args) {
+        return camera_control->getRange_Zoom(args...);
+      },
+      [camera_control](auto... args) {
+        return camera_control->get_Zoom(args...);
+      });
+
+  photo_capabilities->red_eye_reduction = mojom::RedEyeReduction::NEVER;
+  photo_capabilities->height = mojom::Range::New();
+  photo_capabilities->width = mojom::Range::New();
+  photo_capabilities->torch = false;
+
+  callback.Run(std::move(photo_capabilities));
+}
+
 // Implements SinkFilterObserver::SinkFilterObserver.
 void VideoCaptureDeviceWin::FrameReceived(const uint8_t* buffer,
                                           int length,